24 files changed, 4177 insertions, 0 deletions

diff --git a/src/include/xbase.h b/src/include/xbase.h
new file mode 100755
index 0000000..33d2dc9
--- /dev/null
+++ b/src/include/xbase.h
@@ -0,0 +1,93 @@
+/*  xbase.h
+
+
+Xbase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+#include <xbconfig.h>
+#include <stdio.h>
+#include <errno.h>
+#include <time.h>
+#include <math.h>
+
+#ifdef HAVE_INTTYPES_H
+#include <inttypes.h>
+#endif
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+
+// #ifdef STDC_HEADERS
+#ifdef HAVE_STDARGS_H
+#include <stdargs.h>
+#endif
+
+#ifdef HAVE_CTYPE_H
+#include <ctype.h>
+#endif
+
+#ifdef HAVE_STDARG_H
+#include <stdarg.h>
+#endif
+
+#ifdef HAVE_STAT_H
+#include <sys/stat.h>
+#endif
+
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef HAVE_VARARGS_H
+#include <varargs.h>
+#endif
+
+#ifdef HAVE_WINDOWS_H
+#include <windows.h>
+#include <io.h>
+#endif
+
+#include <iomanip>
+
+#include <xbretcod.h>
+#include <xbtypes.h>
+#include <xbstring.h>
+#include <xbssv.h>
+#include <xbdate.h>
+#include <xbtblmgr.h>
+#include <xbxbase.h>
+#include <xblnknod.h>
+#include <xblnklst.h>
+#include <xblnklstord.h>
+#include <xbfile.h>
+#include <xblog.h>
+#include <xbmemo.h>
+#include <xbbcd.h>
+#include <xbuda.h>
+#include <xbexpnode.h>
+#include <xbexp.h>
+
+#include <xbtag.h>
+#include <xbdbf.h>             /* dbf base class   */
+#include <xbindex.h>           /* index base class */
+#include <xbfilter.h>
+#include <xbsql.h>
diff --git a/src/include/xbbcd.h b/src/include/xbbcd.h
new file mode 100755
index 0000000..f94ed01
--- /dev/null
+++ b/src/include/xbbcd.h
@@ -0,0 +1,95 @@
+/*  xbbcd.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014, 2018, 2019, 2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+#ifndef __XB_BCD_H__
+#define __XB_BCD_H__
+#ifdef XB_INDEX_SUPPORT
+
+///@cond DOXYOFF
+
+namespace xb{
+
+// structure for bcd value
+// next structure superceeded.  Different compilers allocate different
+// sizes to structures with bit fields, can't count on the size
+
+/*
+struct XBDLLEXPORT xbBcdStrucOld {
+  unsigned SigDigits : 8;            // significant digit count
+  unsigned Filler    : 2;            // always set to 1
+  unsigned EncDigits : 5;            // encoded digit count
+  unsigned Sign      : 1;            // +/- sign
+  unsigned char Data[10];
+};
+*/
+
+struct XBDLLEXPORT xbBcdStruct {
+  unsigned char cSigDigits;          // significant digit count
+  unsigned char cEncDigits;          // encoded digit count
+  unsigned char cData[10];           // data
+};
+
+struct XBDLLEXPORT xbByteSplit {
+  unsigned c1 : 4;
+  unsigned c2 : 4;
+};
+
+class XBDLLEXPORT xbBcd {
+ public:
+
+   xbBcd( const xbString &sIn );
+   xbBcd( xbDouble dIn );
+   xbBcd( const void *vBcd12In );
+   void Set( xbDouble dIn );
+   void Set( const void *cBcd12In );
+   void Set( const xbString &sIn );
+
+
+   void ToString( xbString &sOut );
+   void ToDouble( xbDouble &dOut );
+   void ToBcd( xbBcdStruct &bcdOut );
+   void ToChar( char *cOut );
+
+   // const unsigned char * GetBcd() const;
+   void StringToBcd( const xbString &sStringIn );
+
+//   void StringToBcdOld( const xbString &sStringIn );
+
+   xbInt16 Compare( const xbBcd &bcdIn );
+   xbInt16 Compare( xbDouble d );
+
+   const unsigned char *GetData() const;
+   const void * GetBcd() const;
+
+
+ private:
+   void ctor();
+   unsigned char GetEncDigitsNoSign() const;
+   unsigned GetSign() const;
+   unsigned GetSigDigits() const;
+   unsigned GetActualSigDigits() const;
+
+
+//   xbBcdStruc  bcdOld;
+   xbBcdStruct bcd;
+};
+
+}        /* namespace xb     */
+
+
+///@endcond DOXYOFF
+
+#endif   /* XB_INDEX_SUPPORT */
+#endif   /* __XB_BCD_H__   */
diff --git a/src/include/xbconfig.h.in b/src/include/xbconfig.h.in
new file mode 100755
index 0000000..b749ff2
--- /dev/null
+++ b/src/include/xbconfig.h.in
@@ -0,0 +1,122 @@
+// the configured options and settings for xbase
+
+#define xbase_VERSION_MAJOR     @xbase_VERSION_MAJOR@
+#define xbase_VERSION_MINOR     @xbase_VERSION_MINOR@
+#define xbase_VERSION_PATCH     @xbase_VERSION_PATCH@
+
+#define PROJECT_PARENT_DIR     "@PROJECT_PARENT_DIR@"
+#define PROJECT_BINARY_DIR     "@PROJECT_BINARY_DIR@"
+
+#define PROJECT_SOURCE_DIR     "@PROJECT_SOURCE_DIR@"
+#define PROJECT_RUNTIME_DIR    "@PROJECT_RUNTIME_DIR@"
+#define PROJECT_DATA_DIR       "@PROJECT_DATA_DIR@"
+#define PROJECT_LOG_DIR        "@PROJECT_LOG_DIR@"
+#define PROJECT_DFLT_LOGFILE   "@CMAKE_SYSTEM_NAME@_@XB_PLATFORM@.xbLog.txt"
+#define EXTRA_LIBS             "@EXTRA_LIBS@"
+#define CMAKE_RUNTIME_OUTPUT_DIRECTORY "@CMAKE_RUNTIME_OUTPUT_DIRECTORY@"
+
+
+#define CMAKE_HOME_DIRECTORY   "@CMAKE_HOME_DIRECTORY@"
+#define CMAKE_PROJECT_NAME     "@CMAKE_PROJECT_NAME@"
+#define BUILD_SHARED_LIBS      "@BUILD_SHARED_LIBS@"
+#define CMAKE_SYSTEM_NAME      "@CMAKE_SYSTEM_NAME@"
+#define CMAKE_SYSTEM_PROCESSOR "@CMAKE_SYSTEM_PROCESSOR@"
+#define CMAKE_SYSTEM_VERSION   "@CMAKE_SYSTEM_VERSION@"
+#define CMAKE_BUILD_TYPE       "@CMAKE_BUILD_TYPE@"
+#define CMAKE_C_FLAGS          "@CMAKE_C_FLAGS@"
+#define CMAKE_C_FLAGS_DEBUG    "@CMAKE_C_FLAGS_DEBUG@"
+#define CMAKE_C_FLAGS_RELEASE  "@CMAKE_C_FLAGS_RELEASE@"
+
+
+#define XB_PLATFORM            "@XB_PLATFORM@"
+#define Mylibrary_Exports      "@Mylibrary_Exports@"
+#define MYLIB_EXPORT           "@MYLIB_EXPORT@"
+#define CMAKE_SIZEOF_VOID_P    "@CMAKE_SIZEOF_VOID_P@"
+
+#define CMAKE_COMPILER         "@CMAKE_CXX_COMPILER_ID@"
+
+// integer definitions
+#define xbInt16                 @xbInt16@
+#define xbUInt16                @xbUInt16@
+#define xbInt32                 @xbInt32@
+#define xbUInt32                @xbUInt32@
+#define xbInt64                 @xbInt64@
+#define xbUInt64                @xbUInt64@
+
+#cmakedefine UNIX
+
+#cmakedefine CMAKE_COMPILER_IS_GNUCC
+#cmakedefine HAVE_CTYPE_H
+#cmakedefine HAVE_DIRENT_H
+#cmakedefine HAVE_DOS_H
+#cmakedefine HAVE_FCNTL_H
+#cmakedefine HAVE_INTTYPES_H
+#cmakedefine HAVE_STDARG_H
+#cmakedefine HAVE_STDARGS_H
+#cmakedefine HAVE_STRING_H
+#cmakedefine HAVE_STRINGS_H
+#cmakedefine HAVE_STAT_H
+#cmakedefine HAVE_UNISTD_H
+#cmakedefine HAVE_VARARGS_H
+#cmakedefine HAVE_WINDOWS_H
+
+#cmakedefine HAVE__CLOSE_F
+#cmakedefine HAVE_CREATEPROCESSW_F
+#cmakedefine HAVE_CREATEPROCESSW_F2
+#cmakedefine HAVE_FCNTL_F
+#cmakedefine HAVE__FDOPEN_F
+#cmakedefine HAVE__FILENO_F
+#cmakedefine HAVE_FOPEN_S_F
+#cmakedefine HAVE__FSOPEN_F
+
+#cmakedefine HAVE_FORK_F
+#cmakedefine HAVE__FSEEKI64_F
+#cmakedefine HAVE_FSEEKO_F
+#cmakedefine HAVE_FTRUNCATE_F
+#cmakedefine HAVE__LOCALTIME64_S_F
+#cmakedefine HAVE_LOCKFILE_F
+#cmakedefine HAVE_LOCKING_F
+#cmakedefine HAVE__LOCKING_F
+#cmakedefine HAVE__OPEN_F
+#cmakedefine HAVE_SETENDOFFILE_F
+#cmakedefine HAVE_VSNPRINTF_F
+#cmakedefine HAVE__VSNPRINTF_S_F
+#cmakedefine HAVE_VSPRINTF_S_F
+
+#cmakedefine XB_PLATFORM_32
+#cmakedefine XB_PLATFORM_64
+#cmakedefine XB_DEBUG_SUPPORT
+#cmakedefine XB_LINKLIST_SUPPORT
+#cmakedefine XB_MEMO_SUPPORT
+#cmakedefine XB_LOGGING_SUPPORT
+#cmakedefine XB_DBF3_SUPPORT
+#cmakedefine XB_DBF4_SUPPORT
+#cmakedefine XB_LOCKING_SUPPORT
+#cmakedefine XB_FUNCTION_SUPPORT
+#cmakedefine XB_EXPRESSION_SUPPORT
+#cmakedefine XB_INDEX_SUPPORT
+#cmakedefine XB_NDX_SUPPORT
+#cmakedefine XB_MDX_SUPPORT
+#cmakedefine XB_SQL_SUPPORT
+#cmakedefine XB_NDXINF_SUPPORT
+#cmakedefine XB_FILTER_SUPPORT
+
+#cmakedefine XB_UTILS_SUPPORT
+#cmakedefine XB_EXAMPLES_SUPPORT
+
+#cmakedefine HAVE_LONG_LONG
+
+#if defined (WIN32)
+  #if defined ( Mylibrary_Exports )
+    #define  XBDLLEXPORT __declspec(dllexport)
+  #else
+    #define  XBDLLEXPORT __declspec(dllimport)
+  #endif
+#else
+  #define  XBDLLEXPORT
+#endif
+
+#if defined (UNIX) && defined (XB_PLATFORM_32)
+  #define _FILE_OFFSET_BITS 64
+#endif
+
diff --git a/src/include/xbdate.h b/src/include/xbdate.h
new file mode 100755
index 0000000..5406cbb
--- /dev/null
+++ b/src/include/xbdate.h
@@ -0,0 +1,123 @@
+/*  xbdate.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+#ifndef __XB_XBDATE_H__
+#define __XB_XBDATE_H__
+
+#ifdef  CMAKE_COMPILER_IS_GNUCC
+#pragma interface
+#endif
+
+
+namespace xb{
+
+#define XB_FMT_WEEK   1
+#define XB_FMT_MONTH  2
+#define XB_FMT_YEAR   3
+
+// next value is added to the date calculation to match dbase calculation
+// first valid dbase date is 01/01/0001
+#define JUL_OFFSET  1721425L
+
+
+//! @brief xbDate class.
+/*!
+This xbDate class handles two type of date values:<br>
+
+1) Gregorian dates with a format of CCYYMMDD.  This is how dates are stored in dbf files.<br>
+2) Julian dates calculated as the number of days since 1901-01-01 + 1721425.<br>
+
+Leap Years: The routines in the class support both leap years (one every four 
+years) and leap centuries (one every four hundred years.)
+
+A leap year is a year having 366 days, which can be evenly
+divisible by 4 and not by 100.<br>
+Leap centuries are years which are evenly divisible by 400.<br>
+
+From a programming perspective, Julian dates are useful for date 
+arithmetic, determining the difference between two dates or calculating
+a future or past date.<br>
+
+To determine the difference between two dates,  convert both dates to a 
+Julian date and subtract one from the other.<br>
+
+To calculate a future or past date, convert the base date to a Julian date,
+add (or subtract) the number of days necessary to (from) it and convert the
+julian date back to a Gregorian date.
+*/
+
+class XBDLLEXPORT xbDate : public xbSsv {
+  public:
+
+  xbDate();
+  xbDate( const char * Date8 );
+  xbDate( const xbString &Date8 );
+  xbDate( xbInt32 lJulDate );
+  ~xbDate();
+
+  void operator=( const xbDate &d );
+  void operator+=( xbInt32 i );
+  void operator-=( xbInt32 i );
+  void operator++( xbInt32 i );
+  void operator--( xbInt32 i );
+
+  xbInt32 operator-( const xbDate & ) const;
+  const char * operator-( xbInt32 i );
+  const char * operator+( xbInt32 i );
+
+  xbBool operator==( const xbDate & ) const;
+  xbBool operator!=( const xbDate & ) const;
+  xbBool operator< ( const xbDate & ) const;
+  xbBool operator> ( const xbDate & ) const;
+  xbBool operator<=( const xbDate & ) const;
+  xbBool operator>=( const xbDate & ) const;
+
+  xbInt16     CalcRollingCenturyForYear( xbInt16 year ) const;
+  xbInt16     CenturyOf() const;
+  xbInt16     CharDayOf( xbString &sOutCharDay );
+  xbInt16     CharMonthOf( xbString &sOutCharMonth );
+  xbBool      DateIsValid ( const xbString &sDate8 ) const;
+  xbInt16     DayOf( xbInt16 iFormat ) const;
+  xbInt16     CTOD( const xbString &sCtodInDate );
+//  xbInt16     FormatDate( const char *sFmtIn, xbString &sFmtOut );
+  xbInt16     FormatDate( const xbString &sFmtIn, xbString &sFmtOut );
+  const char  *Str() const;
+  xbBool      IsLeapYear( xbInt16 iYear ) const;
+  xbBool      IsLeapYear() const;
+  xbInt32     JulianDays() const;
+  xbInt16     JulToDate8( xbInt32 lJulDate );
+  xbInt16     LastDayOfMonth();
+  xbInt16     MonthOf() const;
+  xbInt16     Set( const xbString &Date8 );
+  xbInt16     Sysdate();
+  xbInt16     YearOf() const;
+
+#ifdef XB_DEBUG_SUPPORT
+  void        Dump( const char * title );
+  void        DumpDateTables();
+#endif
+
+ private:
+  void SetDateTables();
+  xbString sDate8;              /* CCYYMMDD date format                       ie; 20140718 */
+
+  static int iAggregatedDaysInMonths[2][13];
+  static int iDaysInMonths[2][13];
+};
+
+}         /* namespace */
+#endif    /*__XB_XBDATE_H__ */
+
diff --git a/src/include/xbdbf.h b/src/include/xbdbf.h
new file mode 100755
index 0000000..710dd14
--- /dev/null
+++ b/src/include/xbdbf.h
@@ -0,0 +1,538 @@
+/*  xbdbf.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014, 2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+#ifndef __XB_XBDBF_H__
+#define __XB_XBDBF_H__
+
+//#ifdef  CMAKE_COMPILER_IS_GNUCC
+//#pragma interface
+//#endif
+
+namespace xb{
+
+/*****************************/
+/* Field Types               */
+
+#define XB_CHAR_FLD      'C'
+#define XB_LOGICAL_FLD   'L'
+#define XB_NUMERIC_FLD   'N'
+#define XB_DATE_FLD      'D'
+#define XB_MEMO_FLD      'M'
+#define XB_FLOAT_FLD     'F'
+
+/*****************************/
+/* File Status Codes         */
+
+#define XB_CLOSED  0
+#define XB_OPEN    1
+#define XB_UPDATED 2
+
+
+/*****************************/
+/* File Access Modes         */
+// #define XB_SINGLE_USER  0      // file buffering on
+// #define XB_MULTI_USER   1      // file buffering off
+
+/*****************************/
+/* File Lock Functions       */
+#define XB_LOCK       0
+#define XB_UNLOCK     1
+
+#define LK_DBASE      1
+#define LK_CLIPPER    2		// future
+#define LK_FOX        3		// future
+#define LK_XBASE64    9		// future
+
+/*****************************/
+/* Record retrieve options   */
+#define XB_ALL_RECS     0
+#define XB_ACTIVE_RECS  1
+#define XB_DELETED_RECS 2
+
+
+/*****************************/
+/* Other defines             */
+
+#define XB_OVERLAY     1
+#define XB_DONTOVERLAY 0
+#define XB_CHAREOF  '\x1A'         /* end of DBF        */
+#define XB_CHARHDR  '\x0D'         /* header terminator */
+
+
+//! @brief Schema used for defining tables with CreateTable methods.
+/*!
+  See program xb_ex_v3_create_dbf.cpp or xb_ex_v4_create_dbf.cpp 
+  as examples on how to use.
+
+\code
+xbSchema MyRecord[] = {
+//  FieldName,   Type,          Len, Dec
+  { "FIRSTNAME", XB_CHAR_FLD,     15, 0 },
+  { "LASTNAME",  XB_CHAR_FLD,     20, 0 },
+  { "BIRTHDATE", XB_DATE_FLD,      8, 0 },
+  { "AMOUNT",    XB_NUMERIC_FLD,   9, 2 },
+  { "RETIRED?",  XB_LOGICAL_FLD,   1, 0 },
+  { "ZIPCODE",   XB_NUMERIC_FLD,   5, 0 },
+  { "NUMFLD1",   XB_FLOAT_FLD,    12, 2 },
+  { "NUMFLD2",   XB_FLOAT_FLD,    14, 2 },
+  { "MEMO1",     XB_MEMO_FLD,     10, 0 },
+  { "",0,0,0 }};
+\endcode
+*/
+struct XBDLLEXPORT xbSchema {
+  char      cFieldName[11];
+  char      cType;
+  xbInt16   iFieldLen;      /* fields are stored as one byte on record*/
+  xbInt16   iNoOfDecs;
+};
+
+///@cond DOXYOFF
+struct XBDLLEXPORT xbSchemaRec {
+  char     cFieldName[11];   /* ASCIIZ field name                       */
+  char     cType;            /* field type                              */
+  char     *pAddress;        /* pointer to field in record buffer 1     */
+  unsigned char cFieldLen;   /* fields are stored as one byte on record */
+  unsigned char cNoOfDecs;
+  char     *pAddress2;       /* pointer to field in record buffer 2     */
+  xbInt16  iLongFieldLen;    /* to handle long field lengths            */
+  unsigned char cIxFlag;     /* DBase IV Index field flag               */
+};
+///@endcond DOXYOFF
+
+
+
+///@cond DOXYOFF
+#ifdef XB_INDEX_SUPPORT
+class XBDLLEXPORT xbIx;
+// structure for file list, each open DBF file can have one or more index files
+struct XBDLLEXPORT xbIxList {
+  xbIxList *next;
+  xbIx     *ix;
+  xbString *sFmt;
+};
+#endif // XB_INDEX_SUPPORT
+///@endcond DOXYOFF
+
+
+//! @brief Base class for handling dbf files/tables.
+/*!
+The xbDbf class is used as a base class for accessing dbf files.  
+In line with relational theory, a each dbf file can be considered as a table.
+The documentation uses the terms dbf and table interchangeably.<br>
+
+This module handles methods for accessing and updating dbf files.
+
+<br>
+The class is designed to support additional file layouts with a minimal amount of effort.
+If you are wanting to update the library to support a new dbf file type not currently supported 
+by the library, create a derived class using xbDbf as a base class and modify methods needed
+to support the new dbf file version.<br>
+See the following for examples on how to start on this:<br>
+xbDbf3 is a derived class from xbDbf and supports the original Dbase III+ file version.<br>
+xbDbf4 is a derived class from xbDbf and supports the original Dbase IV file version.<br>
+
+*/
+
+
+class XBDLLEXPORT xbDbf : public xbFile {
+
+ public:
+  xbDbf( xbXBase *x );
+  virtual ~xbDbf();
+
+  virtual xbInt16  Abort();
+  virtual xbInt16  AppendRecord();
+  virtual xbInt16  BlankRecord();
+  virtual xbInt16  Commit();
+  virtual xbInt16  Close();
+  virtual xbInt16  CopyDbfStructure( xbDbf *dNewTable, const xbString &sTableName, const xbString &sTableAlias, xbInt16 iOverlay, xbInt16 iShareMode );
+  virtual xbInt16  CreateTable      ( const xbString &sTableName, const xbString &sAlias, xbSchema *pSchema, xbInt16 iOverlay, xbInt16 iShareMode ) = 0;
+  virtual xbInt16  DeleteTable      ();
+  virtual xbInt16  DeleteAll        ( xbInt16 iOption );
+  virtual xbInt16  DeleteAllRecords ();
+  virtual xbInt16  DeleteRecord     ();
+  virtual xbInt16  DumpHeader       ( xbInt16 iOption ) const;
+  virtual xbInt16  DumpRecord       ( xbUInt32 ulRecNo, xbInt16 iOutputDest = 0, xbInt16 iOutputFmt = 0 );
+  virtual xbInt16  GetAutoCommit    () const;
+  virtual xbInt16  GetAutoCommit    ( xbInt16 iOption ) const;
+  virtual xbUInt32 GetCurRecNo      () const;
+  virtual xbInt16  GetDbfStatus     () const;
+  virtual xbInt32  GetFieldCnt      () const;
+  virtual xbInt16  GetFirstRecord   ();
+  virtual xbInt16  GetFirstRecord   ( xbInt16 iOption );
+  virtual xbInt16  GetLastRecord    ();
+  virtual xbInt16  GetLastRecord    ( xbInt16 iOption );
+
+  virtual xbInt16  GetNextRecord    ();
+  virtual xbInt16  GetNextRecord    ( xbInt16 iOption );
+  virtual xbInt16  GetNextRecord    ( xbInt16 iOption, xbUInt32 ulStartRec );
+  virtual xbInt32  GetPhysicalIxCnt () const;
+  virtual xbInt16  GetPrevRecord    ();
+  virtual xbInt16  GetPrevRecord    ( xbInt16 iOption );
+  virtual xbInt16  GetRecord        ( xbUInt32 ulRecNo );
+  virtual xbInt16  GetRecordCnt     ( xbUInt32 & ulRecCnt );
+  virtual char *   GetRecordBuf     ( xbInt16 iOpt = 0 ) const;
+  virtual xbUInt16 GetRecordLen     () const;
+  virtual const    xbString &GetTblAlias() const;
+  virtual xbInt16  GetVersion       () const = 0; 
+  virtual xbXBase  *GetXbasePtr     () const;   // return xbase pointer
+
+  virtual xbBool   MemoFieldsExist  () const;
+
+  virtual xbInt16  Open             ( const xbString &sTableName );
+  virtual xbInt16  Open             ( const xbString &sTableName, const xbString &sAlias );
+  virtual xbInt16  Open             ( const xbString &sTableName, const xbString &sAlias, xbInt16 iOpenMode, xbInt16 iShareMode ) = 0;
+  virtual xbInt16  Pack             ();
+  virtual xbInt16  Pack             ( xbUInt32 &ulDeletedRecCnt );
+
+
+  virtual xbInt16  PutRecord        ();     // Put record to current location
+  virtual xbInt16  PutRecord        ( xbUInt32 ulRecNo );
+  virtual xbInt16  ReadHeader       ( xbInt16 iFilePositionOption, xbInt16 iReadOption );
+  virtual xbInt16  RecordDeleted    ( xbInt16 iOpt = 0 ) const;
+
+  virtual xbInt16  SetAutoCommit    ( xbInt16 iAutoCommit );
+
+  virtual xbInt16  UndeleteAllRecords();
+  virtual xbInt16  UndeleteRecord   ();
+  virtual xbInt16  Zap              ();
+
+
+  /* field methods */
+  //virtual xbInt16  GetRawField( xbInt16 iFieldNo, char *Buf, xbUInt32 BufSize, xbInt16 iRecBufSw ) const;
+  virtual xbInt16  GetField(xbInt16 iFieldNo, xbString &sFieldValue, xbInt16 iRecBufSw ) const;
+  virtual xbInt16  GetField(xbInt16 iFieldNo, xbString &sFieldValue) const;
+  virtual xbInt16  GetField(const xbString &sFieldName, xbString &sFieldValue) const;
+  virtual xbInt16  GetFieldDecimal( xbInt16 iFieldNo, xbInt16 &iFieldDecimal ) const;
+  virtual xbInt16  GetFieldDecimal( const xbString &sFieldName, xbInt16 &iFieldDecimal ) const;
+  virtual xbInt16  GetFieldLen( xbInt16 iFieldNo, xbInt16 &iFieldLen ) const;
+  virtual xbInt16  GetFieldLen( const xbString &sFieldName, xbInt16 &iFieldLen ) const;
+  virtual xbInt16  GetFieldName( xbInt16 iFieldNo, xbString &sFieldName ) const;
+
+  virtual xbInt16  GetFieldNo( const xbString &sFieldName, xbInt16 &iFieldNo ) const;
+  virtual xbInt16  GetFieldNo( const xbString &sFieldName ) const;
+
+  virtual xbInt16  GetFieldType( xbInt16 iFieldNo, char &cFieldType ) const;
+  virtual xbInt16  GetFieldType( const xbString &sFieldName, char &cFieldType ) const;
+  virtual xbInt16  PutField( const xbString &sFieldName, const xbString &sFieldData );
+  virtual xbInt16  PutField( xbInt16 iFieldNo, const xbString &sFieldData );
+
+  virtual xbInt16  PutLogicalField( xbInt16 iFieldNo, const xbString &sFieldData );
+  virtual xbInt16  PutLogicalField( const xbString &sFieldName, const  xbString &sFieldData );
+  virtual xbInt16  GetLogicalField( xbInt16 iFieldNo, xbString &sFieldData ) const;
+  virtual xbInt16  GetLogicalField( const xbString &sFieldName, xbString &sFieldData) const;
+
+  virtual xbInt16  PutLogicalField( xbInt16 iFieldNo, xbBool bFieldData );
+  virtual xbInt16  PutLogicalField( const xbString &sFieldName, xbBool bFieldData );
+  virtual xbInt16  GetLogicalField( xbInt16 iFieldNo, xbBool &bFieldData ) const;
+  virtual xbInt16  GetLogicalField( xbInt16 iFieldNo, xbBool &bFieldData, xbInt16 iRecBufSw ) const;
+  virtual xbInt16  GetLogicalField( const xbString &sFieldName, xbBool &bFieldData) const;
+
+  virtual xbInt16  GetLongField( xbInt16 iFieldNo, xbInt32 &lFieldValue ) const;
+  virtual xbInt16  GetLongField( const xbString &sFieldName, xbInt32 &lFieldValue ) const;
+  virtual xbInt16  PutLongField( xbInt16 iFieldNo, xbInt32 lFieldValue );
+  virtual xbInt16  PutLongField( const xbString &sFieldNo, xbInt32 lFieldValue );
+
+  virtual xbInt16  GetULongField( xbInt16 iFieldNo, xbUInt32 &lFieldValue ) const;
+  virtual xbInt16  GetULongField( const xbString &sFieldName, xbUInt32 &lFieldValue ) const;
+  virtual xbInt16  PutULongField( xbInt16 iFieldNo, xbUInt32 lFieldValue );
+  virtual xbInt16  PutULongField( const xbString &sFieldNo, xbUInt32 lFieldValue );
+
+  virtual xbInt16  GetDoubleField( xbInt16 FieldNo, xbDouble &dFieldValue ) const;
+  virtual xbInt16  GetDoubleField( xbInt16 FieldNo, xbDouble &dFieldValue, xbInt16 iRecBufSw ) const;
+  virtual xbInt16  GetDoubleField( const xbString &sFieldName, xbDouble &dFieldValue ) const;
+  virtual xbInt16  PutDoubleField( xbInt16 FieldNo, xbDouble dFieldValue );
+  virtual xbInt16  PutDoubleField( const xbString &FieldName, xbDouble dFieldValue );
+
+  virtual xbInt16  GetFloatField( xbInt16 iFieldNo, xbFloat &fFieldValue ) const;
+  virtual xbInt16  GetFloatField( const xbString &sFieldName, xbFloat &fFieldValue ) const;
+  virtual xbInt16  PutFloatField( xbInt16 iFieldNo, xbFloat fFieldValue );
+  virtual xbInt16  PutFloatField( const xbString &sFieldName, xbFloat fFieldValue );
+
+  virtual xbInt16  GetDateField( xbInt16 iFieldNo, xbDate &dt ) const;
+  virtual xbInt16  GetDateField( const xbString &sFieldName, xbDate &dt ) const;
+  virtual xbInt16  PutDateField( xbInt16 iFieldNo, const xbDate &dt );
+  virtual xbInt16  PutDateField( const xbString &sFieldName, const xbDate &dt );
+
+
+
+  #ifdef XB_MEMO_SUPPORT
+  virtual xbInt16  GetMemoFieldCnt   () const;
+  virtual xbMemo   *GetMemoPtr       ();
+  virtual xbUInt32 GetCreateMemoBlockSize() const;
+  virtual xbInt16  GetMemoField      ( xbInt16 iFldNo, xbString &sMemoData );
+  virtual xbInt16  GetMemoField      ( const xbString & sFldName, xbString &sMemoData );
+  virtual xbInt16  GetMemoFieldLen   ( xbInt16 iFldNo, xbUInt32 &ullMemoFieldLen );
+  virtual xbInt16  GetMemoFieldLen   ( const xbString & sFldName, xbUInt32 &ulMemoFieldLen );
+  virtual xbBool   MemoFieldExists   ( xbInt16 iFieldNo ) const;
+  virtual xbBool   MemoFieldExists   ( const xbString &sFieldName ) const;
+  virtual xbInt16  SetCreateMemoBlockSize( xbUInt32 ulBlockSize ) = 0;
+  virtual xbInt16  UpdateMemoField   ( xbInt16 iFldNo, const xbString &sMemoData );
+  virtual xbInt16  UpdateMemoField   ( const xbString & sFldName, const xbString &sMemoData );
+  #endif // XB_MEMO_SUPPORT
+
+
+  #ifdef XB_LOCKING_SUPPORT
+  virtual xbInt16 LockTable         ( xbInt16 iLockFunction );
+  virtual xbInt16 LockRecord        ( xbInt16 iLockFunction, xbUInt32 ulRecNo );
+  virtual xbInt16 LockAppend        ( xbInt16 iLockFunction );
+  virtual xbInt16 LockHeader        ( xbInt16 iLockFunction );
+
+  #ifdef XB_MEMO_SUPPORT
+  virtual xbInt16 LockMemo          ( xbInt16 iLockFunction );
+  virtual xbBool  GetMemoLocked     () const; 
+  #endif  // XB_MEMO_LOCK
+
+  #ifdef XB_INDEX_SUPPORT
+  virtual xbInt16 LockIndices       ( xbInt16 iLockFunction );
+  #endif // XB_INDEX_SUPPORT
+
+  xbInt16         GetAutoLock       () const;
+  void            SetAutoLock       ( xbInt16 iAutoLock );
+  xbInt16         GetLockFlavor     () const;
+  void            SetLockFlavor     ( xbInt16 iLockFlavor );
+  xbBool          GetTableLocked    () const;
+  xbBool          GetHeaderLocked   () const;
+  xbUInt32        GetAppendLocked   () const;
+  xbLinkListNode<xbUInt32> *  GetFirstRecLock   () const;
+
+  #ifdef XB_DEBUG_SUPPORT
+  void            DumpTableLockStatus() const;
+  #endif  // XB_DEBUG_SUPPORT
+  #endif  // XB_LOCKING_SUPPORT
+
+
+  #ifdef XB_INDEX_SUPPORT
+  virtual xbInt16  CloseIndexFile( xbIx *pIx );
+  virtual xbInt16  CreateTag( const xbString &sIxType, const xbString &sName, const xbString &sKey, const xbString &sFilter, 
+                   xbInt16 iDescending, xbInt16 iUnique, xbInt16 iOverLay, xbIx **xbIxOut, void **vpTagOut );
+  virtual xbInt16  DeleteTag( const xbString &sIxType, const xbString &sName );
+  virtual xbInt16  DeleteAllIndexFiles();
+  virtual xbInt16  Find( xbString &sKey );
+  virtual xbInt16  Find( xbDate &dtKey );
+  virtual xbInt16  Find( xbDouble &dKey );
+  virtual xbIx     *GetCurIx() const;
+  virtual void     *GetCurTag() const;
+  
+  virtual xbInt16  GetFirstKey();
+  virtual xbInt16  GetNextKey();
+  virtual xbInt16  GetPrevKey();
+  virtual xbInt16  GetLastKey();
+  
+  virtual const    xbString &GetCurIxType() const;
+  virtual const    xbString &GetCurTagName() const;
+  virtual xbIxList *GetIxList() const;
+  xbLinkListNode<xbTag *> *GetTagList   () const;
+  virtual xbInt16  OpenIndex( const xbString &sIxType, const xbString &sIndexName );
+  virtual xbInt16  SetCurTag( const xbString &sTagName );
+  virtual void     SetCurTag( const xbString &sIxType, xbIx *pIx, void *vpTag );
+
+  #ifdef XB_DEBUG_SUPPORT
+  virtual xbInt16  CheckTagIntegrity( xbInt16 iTagOpt, xbInt16 iOutputOpt );
+  virtual xbInt16  Reindex( xbInt16 iTagOpt );
+  #endif  // XB_DEBUG_SUPPORT
+  #endif  // XB_INDEX_SUPPORT
+
+  #ifdef XB_NDXINF_SUPPORT
+  virtual xbInt16  AssociateIndex( const xbString &sType, const xbString &sName, xbInt16 iOption );
+  xbLinkListNode<xbString> *GetNdxInfList() const;
+  #endif   // XB_NDXINF_SUPPORT
+
+  //#ifdef XB_MDX_SUPPORT
+  //virtual xbInt16  GetCreateMdxBlockSize() const;
+  //virtual xbInt16  SetCreateMdxBlockSize( xbInt16 ulBlockSize );
+  //#endif
+
+
+
+ protected:
+  #ifdef XB_INDEX_SUPPORT
+  friend class xbIx;
+  friend class xbIxMdx;
+
+           xbInt16  AddIndex( xbIx *ix, const xbString &sFmt );
+           void     ClearTagList();
+  virtual  xbInt16  GetNdxInfFileName( xbString &sNdxIdxFileName );
+           xbInt16  RemoveIndex( xbIx * ix );
+           void     UpdateSchemaIxFlag( xbInt16 iFldNo, unsigned char cVal );
+  virtual  xbInt16  UpdateTagList      ();
+  #endif
+
+
+
+  #ifdef XB_LOCKING_SUPPORT
+  void     SetHeaderLocked   ( xbBool bTableLocked );
+  void     SetTableLocked    ( xbBool bTableLocked );
+  #endif // XB_LOCKING_SUPORT
+
+  #ifdef XB_MEMO_SUPPORT
+  xbInt16  iMemoFieldCnt;                 // Memo field cnt in the table
+  xbMemo   *Memo;                         // Pointer to memo class
+  xbUInt32 ulCreateMemoBlockSize;         // blocksize to use when creating dbt file
+  #endif
+
+  #ifdef XB_NDXINF_SUPPORT
+  virtual xbInt16  DeleteNdxInfData();
+  virtual xbInt16  LoadNdxInfData();
+  virtual xbInt16  SaveNdxInfData();
+  #endif // XB_NDXINF_SUPPORT
+
+/*
+  #ifdef XB_MDX_SUPPORT
+  xbInt16  iCreateMdxBlockSize;
+  #endif // XB_MDX_SUPPORT
+*/
+
+  virtual  xbInt16  GetRawField( xbInt16 iFieldNo, char *Buf, xbUInt32 BufSize, xbInt16 iRecBufSw ) const;
+  virtual  void     InitVars(); 
+  virtual  xbInt16  SetVersion() = 0;
+  virtual  xbInt16  ValidateSchema( xbSchema * s ) = 0;
+  xbInt16  WriteHeader( xbInt16 iPositionOption, xbInt16 iWriteOption );
+
+
+  xbUInt32 ulCurRec;               // Current record or zero
+  xbInt16  iAutoCommit;            // Auto commit updates if not explicitly performed before moving off record?
+                                   //  -1  -->  Use DBMS default
+                                   //   0  -->  No auto update on this table, regardless of DBMS setting
+                                   //   1  -->  Auto update on this table, regardless of DBMS setting
+
+  xbInt16  iFileVersion;           // xBase  file version - which class is in play
+
+
+  xbString sAlias;                 // table alias
+  xbInt16  iNoOfFields;
+  xbInt16  iDbfStatus;             // 0 = closed
+                                   // 1 = open
+                                   // 2 = updates pending
+
+  xbSchemaRec *SchemaPtr;          // Pointer to field data
+  char     *RecBuf;                // Pointer to record buffer
+  char     *RecBuf2;               // Pointer to original rec buf
+
+
+/* Next several variables are database header fields, up through dbase V */
+  unsigned char cVersion;
+  char     cUpdateYY;
+  char     cUpdateMM;
+  char     cUpdateDD;
+  xbUInt32 ulNoOfRecs;
+  xbUInt16 uiHeaderLen;
+  xbUInt16 uiRecordLen;
+  char     cTransactionFlag;
+  char     cEncryptionFlag;
+  char     cIndexFlag;
+  char     cLangDriver;                   // dbase 7 sets to 1B
+
+
+
+ private:
+  void     ResetNoOfRecords(); 
+
+
+#ifdef XB_LOCKING_SUPPORT
+  xbInt16  iAutoLock;                     // 0 - autolock off, 1 - autolock on
+  xbInt16  iLockFlavor;
+  xbBool   bTableLocked;                  // is the table locked
+  xbBool   bHeaderLocked;                 // is the header locked
+  xbUInt32 ulAppendLocked;                // record number of the new record for the append lock operation
+  xbLinkListOrd<xbUInt32> lloRecLocks;    // ordered link list of locked records
+#endif
+
+
+#ifdef XB_INDEX_SUPPORT
+  xbIxList *ixList;                      // pointer to a list of indices associated with the table
+//  #ifdef XB_MDX_SUPPORT
+//  xbIx     *ixMdx;                       // pointer to production multi-tag index file
+//  #endif
+  xbIx     *pCurIx;                      // Pointer to current index class
+  void     *vpCurIxTag;                  // Pointer to current tag
+  xbString sCurIxType;                   // Current index type
+  xbLinkList<xbTag *> llTags;            // linked list of open tags
+
+#endif // XB_INDEX_SUPPORT
+
+#ifdef XB_NDXINF_SUPPORT
+  xbLinkList<xbString> llNdxInfData;      // linked list of strings containing ndx file entries
+#endif   // XB_NDXINF_SUPPORT
+
+
+};
+
+
+#ifdef XB_DBF3_SUPPORT
+//! @brief Derived class for handling dbf version III files/tables.
+/*!
+The xbDbf class is used as a base class for accessing dbf files.
+The xbDbf3 class is derived from the xbDbf class and is designed to handle the
+orginal version 3 type files.
+*/
+
+class XBDLLEXPORT xbDbf3 : public xbDbf {
+ public:
+  xbDbf3(xbXBase *x);
+  ~xbDbf3();
+  virtual xbInt16 CreateTable   ( const xbString &sTableName, const xbString &sAlias, xbSchema *, xbInt16 iOverlay, xbInt16 iShareMode );
+  virtual xbInt16 GetVersion    () const;
+  virtual xbInt16 Open          ( const xbString &sTableName, const xbString &sAlias, xbInt16 iOpenMode, xbInt16 iShareMode );
+
+  #ifdef XB_MEMO_SUPPORT
+  virtual xbInt16 SetCreateMemoBlockSize( xbUInt32 iBlockSize );
+  #endif
+
+ protected:
+  xbInt16 SetVersion    ();
+  virtual xbInt16 ValidateSchema( xbSchema *s );
+
+ private:
+
+};
+#endif   /* XB_DBF3_SUPPORT */
+
+
+#ifdef XB_DBF4_SUPPORT
+//! @brief Derived class for handling dbf version IV files/tables.
+/*!
+The xbDbf class is used as a base class for accessing dbf files.
+The xbDbf4 class is derived from the xbDbf class and is designed to handle the
+orginal version 4 type files.
+*/
+class XBDLLEXPORT xbDbf4 : public xbDbf {
+ public:
+  xbDbf4( xbXBase *x );
+
+  ~xbDbf4();
+
+  virtual xbInt16 CreateTable     ( const xbString &sTableName, const xbString &sAlias, xbSchema *, xbInt16 iOverlay, xbInt16 iShareMode );
+  virtual xbInt16 GetVersion      () const;
+  virtual xbInt16 Open            ( const xbString &sTableName, const xbString &sAlias, xbInt16 iOpenMode, xbInt16 iShareMode );
+
+  #ifdef XB_MEMO_SUPPORT
+  virtual xbInt16 SetCreateMemoBlockSize( xbUInt32 iBlockSize );
+  #endif
+
+ protected:
+  // void    InitVars  ();
+  xbInt16 SetVersion();
+  virtual xbInt16 ValidateSchema  ( xbSchema *s );
+
+ private:
+
+};
+
+#endif   /* XB_DBF4_SUPPORT */
+
+}        /* namespace xb    */
+#endif   /* __XB_DBF_H__ */
diff --git a/src/include/xbexp.h b/src/include/xbexp.h
new file mode 100755
index 0000000..96413ac
--- /dev/null
+++ b/src/include/xbexp.h
@@ -0,0 +1,215 @@
+/*  xbexp.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+#ifndef __XB_EXP_H__
+#define __XB_EXP_H__
+
+
+// #ifdef  CMAKE_COMPILER_IS_GNUCC
+// #pragma interface
+// #endif
+
+
+
+#ifdef XB_FUNCTION_SUPPORT
+#define XB_EXP_CHAR      'C'
+#define XB_EXP_DATE      'D'
+#define XB_EXP_LOGICAL   'L'
+#define XB_EXP_NUMERIC   'N'
+#define XB_EXP_UNKNOWN   'U'
+#endif
+
+#ifdef XB_EXPRESSION_SUPPORT
+
+#define XB_EXP_CONSTANT      'C'
+#define XB_EXP_FUNCTION      'F'
+#define XB_EXP_FIELD         'D'
+#define XB_EXP_OPERATOR      'O'
+#define XB_EXP_NOTROOT       'N'    // not root node, needs further parsing
+#define XB_EXP_PRE_OPERATOR  'B'    // (B)efore) pre increment, pre decrement
+#define XB_EXP_POST_OPERATOR 'A'    // (A)fter)  post increment, pre decrement
+
+#define XB_END_OF_EXPRESSION -100
+
+// #define XB_UNBALANCED_PARENS -101
+// #define XB_UNBALANCED_QUOTES -102
+
+
+namespace xb{
+
+///@cond DOXYOFF
+struct XBDLLEXPORT xbExpToken {
+  xbString sExpression;      // in - expression to pull next token from
+                             // out - remainder of the expression after token removed
+  xbString sToken;           // next token pulled from the expression
+  char     cNodeType;        // one of XB_EXP_CONSTANT, XB_EXP_FUNCTION, XB_EXP_FIELD, XB_EXP_OPERATOR, XB_EXP_NOTROOT
+  char     cReturnType;      // one of XB_EXP_CHAR, XB_EXP_DATE, XB_EXP_LOGICAL, XB_EXP_NUMERIC, XB_EXP_UNKNOWN
+  xbInt16  iSts;             // return status after retrieving or attempting next token from expression
+                             // 0 = no error
+                             // XB_END_OF_EXPRESSION
+                             // XB_UNBALANCED_PARENS
+                             // XB_UNBALANCED_QUOTES
+  char     cPrevNodeType;    // previous node type
+  char     cPrevReturnType;  // previous return type
+
+  // constructor
+  xbExpToken() { cNodeType = 0; cReturnType = 0; iSts = 0; cPrevNodeType = 0; cPrevReturnType = 0; }
+};
+///@endcond DOXYOFF
+
+
+/************************************************************************/
+
+//! @brief Class for handling expressions.
+/*!
+The xbExp class is used for parsing and evaluating expression.
+
+The Xbase64 library includes an expression parsing module which assists 
+application programmers by providing a high level data manipulation tool and 
+also allows for building complex index keys.
+
+The functions included were derived from dBASE III Plus, Dbase IV and Clipper.<br><br>
+
+<h3>Internal fuctioning</h3>
+The expression module works in two phases.  Firstly, method 
+<em>ParseExpression</em> is called and builds an expression tree from 
+all the components of the expression. The tree is made up of individual 
+nodes. The expression is checked for valid field names, literals, 
+operands and functions.  Any field references are resolved.  If fields 
+are used in an expression and the database name for the field is not 
+included in the name with the -> operand, the routines assume the 
+associated database has been successfully opened. 
+<br>
+Secondly, method <em>ProcessExpression</em> is called to process the 
+expression tree created by ParseExpression().  The routine parses each 
+node in the expression tree, executing functions, processing operands 
+and manipulating data to produce the desired result.<br>
+
+If an expression will be processed repeatedly, it is best to pre-parse the
+tree using <em>ParseExpression</em>, then for each new call to the expression,
+execute method <em>ProcessExpression</em> which processes the tree.<br><br>
+
+<h3>Expression Return Types</h3>
+Expressions will return a type of CHAR, NUMERIC, DATE or LOGICAL.<br>
+
+An expression return type can be determined with method <em>
+GetExpressionResultType</em> after parsing it.<br>
+
+Expressions returning a return type of CHAR are limited to a 200 byte internal 
+buffer.  There is also a 100 byte limit for NDX index key support.  If 
+the 200 byte limit is not large enough for your application, adjust field
+<em>enum { WorkBufMaxLen = 200 };</em> in file <em>exp.h</em>.<br><br>
+
+<h3>Expression Functions</h3>
+Each expression function also has a corresponding C++ function.  It is
+slightly more efficient to call the C++ functions directly, rather than 
+execute the expression parsing routines.<br><br>
+
+<h3>Expression Components</h3>
+Expressions are made up of one or more tokens.  A token is one of literal, 
+database field, operand or function.  Literals are either numeric or character.
+Character literals are enclosed in 'single' or "double" quotes.  numeric 
+literals are a series of one or more contiguous numerals, ".", "+" or "-'".
+<br><br>
+A field is simply a field name in the default database, or is in the form
+of database->fieldname.
+
+*/
+
+class XBDLLEXPORT xbExp{
+
+  public:
+    xbExp( xbXBase * );
+    xbExp( xbXBase *, xbDbf * );
+    virtual ~xbExp();
+    void ClearTreeHandle();
+
+
+    #ifdef XB_DEBUG_SUPPORT
+    void      DumpTree( xbInt16 iOption );
+    void      DumpToken( xbExpToken &t, xbInt16 iOption = 0 );
+    #endif
+
+    xbInt16   GetResultLen() const;
+    char      GetReturnType() const;
+    xbInt16   GetBoolResult( xbBool &bResult );
+    xbInt16   GetDateResult( xbDate &dtResult );
+    xbInt16   GetNumericResult( xbDouble &dResult );
+    xbInt16   GetStringResult( xbString &sResult );
+    xbInt16   GetStringResult( char * vpResult, xbUInt32 ulLen );
+    xbExpNode *GetTreeHandle();
+    xbInt16   ParseExpression( const xbString &sExpression );
+    xbInt16   ParseExpression( xbDbf *dbf, const xbString &sExpression );
+    xbInt16   ProcessExpression();
+    xbInt16   ProcessExpression( xbInt16 iRecBufSw );
+
+
+  protected:
+    xbInt16   GetNextToken( xbExpToken &t );
+    xbInt16   OperatorWeight( const xbString &sOperator );
+    xbExpNode *GetNextNode( xbExpNode * n ) const;  // traverses the tree from bottom left node, right, then up
+
+  private:    // methods
+
+    // xbInt16 CalcExpressionResultLen();
+    xbInt16 CalcFunctionResultLen( xbExpNode *n ) const;
+    xbInt16 CalcCharNodeLen( xbExpNode *n );
+    xbInt16 CheckParensAndQuotes( const xbString &sExpression );
+    xbInt16 GetExpressionResultLen() const;
+
+    xbInt16 GetTokenCharConstant   ( xbExpToken &t );
+    xbInt16 GetTokenDatabaseField  ( xbExpToken &t );
+    xbInt16 GetTokenDateConstant   ( xbExpToken &t );
+    xbInt16 GetTokenFunction       ( xbExpToken &t );
+    xbInt16 GetTokenLogicalConstant( xbExpToken &t );
+    xbInt16 GetTokenNumericConstant( xbExpToken &t );
+    xbInt16 GetTokenOperator       ( xbExpToken &t );
+    xbInt16 GetTokenParen          ( xbExpToken &t );
+
+    xbBool  IsFunction             ( const xbString &sExp, char &cReturnType );
+    xbBool  IsLogicalConstant      ( const xbString &sExp );
+    xbBool  IsNumericConstant      ( const xbString &sExp, char cPrevNodeType );
+    xbBool  IsOperator             ( const xbString &sExp );
+    char    IsTokenSeparator       ( char c );
+    xbBool  IsWhiteSpace           ( char c );
+
+    xbInt16 ParseExpression        ( const xbString &sExpression, xbInt16 iWeight );
+    xbInt16 ParseExpressionConstant( xbExpToken &t, xbExpNode *n );
+    xbInt16 ParseExpressionFunction( xbExpToken &t, xbExpNode *n, xbInt16 iWeight );
+    xbInt16 ParseExpressionFunctionParms( const xbString &sParms, xbLinkList<xbString> &llParms );
+    xbInt16 ParseExpressionField   ( xbExpToken &t, xbExpNode *n );
+    xbInt16 ParseExpressionOperator( xbExpToken &t, xbExpNode *n, xbInt16 iWeight );
+
+    xbInt16 ProcessExpressionFunction( xbExpNode *n, xbInt16 iRecBufSw = 0 );
+    xbInt16 ProcessExpressionOperator( xbExpNode *n );
+
+  private:   // fields
+    xbXBase   *xbase;
+    xbDbf     *dbf;
+    xbExpNode *nTree;        // pointer to tree of expNodes
+    // xbInt16   iExpLen;       // size of expression result
+
+
+};
+
+/* Expression handler */
+
+
+};
+#endif        // XB_EXPRESSION_SUPPORT
+#endif        // __XB_EXP_H__
+
+
diff --git a/src/include/xbexpnode.h b/src/include/xbexpnode.h
new file mode 100755
index 0000000..f50d9eb
--- /dev/null
+++ b/src/include/xbexpnode.h
@@ -0,0 +1,120 @@
+/*  xbexpnode.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+#ifndef __XB_EXPNODE_H__
+#define __XB_EXPNODE_H__
+
+// #ifdef  CMAKE_COMPILER_IS_GNUCC
+// #pragma interface
+// #endif
+
+#ifdef XB_EXPRESSION_SUPPORT
+
+
+namespace xb{
+
+//class XBDLLEXPORT xbDbf;
+
+/************************************************************************/
+//! @brief Expression node class for handling expression nodes.
+/*!
+The xbExpNode class is used by the expression logic for handling specific
+nodes within a tree of nodes.<br>
+
+Expressions are parsed into nodes and a logical tree of nodes is created
+out of all the individual components within the expression.<br>
+
+This class is used for handling a specific node within a tree.<br>
+
+An application program will typically not need to be concerned with
+this class.<br>
+
+*/
+class XBDLLEXPORT xbExpNode {
+  public:
+   xbExpNode();
+   xbExpNode( xbString &sNodeText, char cReturnType, char cNodeType  );
+   xbExpNode( xbString &sNodeText, char cNodeType  );
+   xbExpNode( char cNodeType  );
+
+   virtual   ~xbExpNode();
+   xbInt16   AddChild( xbExpNode *n );
+   xbExpNode *GetChild( xbUInt32 ulChildNo ) const;
+   xbUInt32  GetChildCnt() const;
+   xbUInt32  GetChildNo() const;
+   xbDbf     *GetDbf() const;
+   xbInt16   GetFieldNo() const;
+   xbExpNode *GetFirstNode();
+   xbExpNode *GetNextNode() const;
+   void      GetNodeText( xbString &sNodeText ) const;
+   char      GetNodeType() const;
+   xbExpNode *GetParent() const;
+   xbString  &GetStringResult();
+   xbBool    GetBoolResult() const;
+   xbDouble  GetNumericResult() const;
+   xbUInt32  GetResultLen() const;
+   xbExpNode *GetRightSibling() const;
+   char      GetReturnType() const;
+   xbInt16   GetWeight() const;
+   xbBool    HasRightSibling() const;
+   xbBool    IsOperator() const;
+   xbBool    IsUnaryOperator() const;
+   void      RemoveLastChild();
+   void      SetResultLen( xbUInt32 ulResultLen );
+   void      SetDbfInfo( xbDbf *dbf );
+   void      SetDbfInfo( xbDbf *dbf, xbInt16 iFieldNo );
+   void      SetNodeText( xbString &sNodeText );
+   void      SetNodeType( char cNodeType );
+   void      SetParent( xbExpNode *n );
+   void      SetResult( xbString &sResult );
+   void      SetResult( xbDate   &dtResult );
+   void      SetResult( xbBool   bResult );
+   void      SetResult( xbDouble dResult );
+   void      SetReturnType( char cReturnType );
+   void      SetWeight( xbInt16 iWeight );
+
+   #ifdef XB_DEBUG_SUPPORT
+   void      DumpNode( xbInt16 iOption ) const;     // 0 = no children, 1 = and children
+   #endif
+
+  private:
+   xbString  sNodeText;                 // expression text
+   char      cReturnType;               // one of: XB_EXP_CHAR, XB_EXP_DATE, XB_EXP_LOGICAL, XB_EXP_NUMERIC
+   char      cNodeType;                 // one of: XB_EXP_CONSTANT, XB_EXP_FUNCTION, XB_EXP_FIELD, XB_EXP_OPERATOR
+   xbString  sResult;                   // char result, and operator
+   xbDouble  dResult;                   // numeric and bool results
+   xbExpNode * nParent;                 // pointer to parent
+   xbLinkList<xbExpNode *> llChildren;  // linked list of descendent nodes
+   xbDbf     *dbf;                      // pointer to dbf, used for field, RECNO() and RECCOUNT()
+   xbInt16   iFieldNo;                  // field no if DBF field
+   xbUInt32  ulResultLen;               // for string results, accumulated length of character operations
+                                        // includes the sum of all nodes under this + this
+                                        // date = 8, numeric = 4, logical = 1
+   xbInt16   iWeight;                   // used for buildign the tree of nodes, assigned to operators
+                                        // the higher the number, the lower it goes on the tree
+
+};
+
+/************************************************************************/
+
+/* Expression handler */
+
+
+};
+#endif        // XB_EXPRESSION_SUPPORT
+#endif        // __XB_EXP_H__
+
+
diff --git a/src/include/xbfile.h b/src/include/xbfile.h
new file mode 100755
index 0000000..a636632
--- /dev/null
+++ b/src/include/xbfile.h
@@ -0,0 +1,194 @@
+/*  xbfile.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+#ifndef __XB_FILE_H__
+#define __XB_FILE_H__
+
+#ifdef  CMAKE_COMPILER_IS_GNUCC
+#pragma interface
+#endif
+
+/*****************************/
+/* File Open Modes           */
+#define XB_READ       0
+#define XB_READ_WRITE 1
+#define XB_WRITE      2
+
+/*****************************/
+/* File Access Modes         */
+#define XB_SINGLE_USER  0      // file buffering on
+#define XB_MULTI_USER   1      // file buffering off
+
+namespace xb{
+
+/*! @brief Class for handling low level file I/O.
+*/
+
+/*!
+The xbFile class is used as an abstraction layer to isolate the library from the nuances 
+of different operating systems and machine architectures.
+
+This module handles low level file I/O and is a base class
+for the (dbf) table, (dbt) memo and (ndx,mdx) index classes.
+Files are opened and manipulated via methods in the xbFile class.<br>
+This class handles:<br>
+1) Big and little endian reads/writes<br>
+2) 32 or 64 bit system calls, depending on OS<br>
+3) Various different c/c++ calls to open/close/read/write based on OS and compiler version<br>
+<br>
+If you are wanting to port this library to a new platform, start with this class.
+This class could be used if you want to write a platform independent program that needs R/W file access.
+*/
+
+
+class XBDLLEXPORT xbFile : public xbSsv {
+
+  public:
+    //         xbFile();
+             xbFile( xbXBase * x );
+
+             ~xbFile();
+    xbInt16  CreateUniqueFileName( const xbString &sDirIn, const xbString &sExtIn, xbString &sFqnOut );
+    xbInt16  CreateUniqueFileName( const xbString &sDirIn, const xbString &sExtIn, xbString &sFqnOut, xbInt16 iOption );
+
+    const    xbString& GetDirectory() const;
+    const    xbString& GetFileName() const;
+    const    xbString& GetFqFileName() const;
+
+    void     SetDirectory ( const xbString &sDirectory);
+    void     SetFileName  ( const xbString &sFileName );
+    void     SetFqFileName( const xbString &sFqName );
+
+    xbUInt32 GetBlockSize () const;
+    xbInt16  SetBlockSize ( xbUInt32 ulBlockSize );
+
+    xbInt16  GetOpenMode  () const;
+    xbInt16  GetShareMode () const;
+
+    xbInt16  GetFileDirPart ( xbString &sFileDirPartOut ) const;
+    xbInt16  GetFileDirPart ( const xbString &sCompleteFileNameIn, xbString &sFileDirPartOut ) const;
+    xbInt16  GetFileExtPart ( xbString &sFileExtPartOut ) const;
+    xbInt16  GetFileExtPart ( const xbString &sCompleteFileNameIn, xbString &sFileExtPartOut ) const;
+    xbInt16  GetFileNamePart( xbString &sFileNamePartOut ) const;
+    xbInt16  GetFileNamePart( const xbString &sCompleteFileNameIn, xbString &sFileNamePartOut ) const;
+    xbInt16  GetFileType    ( xbString &sFileType ) const;
+
+    xbInt16  GetXbaseFileTypeByte( const xbString &sFileName, xbInt16 &iVersion );
+    xbInt16  GetXbaseFileTypeByte( const xbString &sFileName, unsigned char &cFileTypeByte );
+    xbInt16  GetXbaseFileTypeByte( const xbString &sFileName, unsigned char &cFileTypeByte, xbInt16 &iVersion );
+    xbInt16  DetermineXbaseTableVersion( unsigned char cFileTypeByte ) const;
+    xbInt16  DetermineXbaseMemoVersion( unsigned char cFileTypeByte ) const;
+
+    xbBool   FileExists () const;
+    xbBool   FileExists ( xbInt16 iOption ) const;
+    xbBool   FileExists ( const xbString &sFileName ) const;
+    xbBool   FileExists ( const xbString &sFileName, xbInt16 iOption ) const;
+
+    xbBool   FileIsOpen () const;
+
+    xbInt16  ReadBlock ( xbUInt32 ulBlockNo, size_t readSize,  void *buf );
+    xbInt16  ReadBlock ( xbUInt32 ulBlockNo, xbUInt32 ulBlockSize, size_t readSize,  void *buf );
+    xbInt16  WriteBlock( xbUInt32 ulBlockNo, size_t writeSize, void *buf );
+
+    xbInt16  GetFileSize( xbUInt64 &ullFileSize );
+    xbInt16  GetFileMtime( time_t &mtime );
+
+    xbDouble eGetDouble( const char *p ) const;
+    xbInt32  eGetInt32 ( const char *p ) const;
+    xbUInt32 eGetUInt32( const char *p ) const;
+    xbInt16  eGetInt16 ( const char *p ) const;
+    xbUInt16 eGetUInt16( const char *p ) const;
+    void     ePutDouble( char *p, xbDouble d );
+    void     ePutInt32 ( char *p, xbInt32 l );
+    void     ePutUInt32( char *p, xbUInt32 ul );
+    void     ePutInt16 ( char *p, xbInt16 s );
+    void     ePutUInt16( char *p, xbUInt16 s );
+
+    xbInt16  xbFclose    ();
+    xbInt16  xbFeof      ();
+    xbInt16  xbFflush    ();
+    xbInt16  xbFgetc     ( xbInt32 &c );
+    xbInt16  xbFgetc     ( char &c );
+
+    #ifdef XB_LOCKING_SUPPORT
+    xbInt16  xbLock           ( xbInt16 iFunction, xbInt64 llOffset, size_t stLen );
+    xbInt16  GetLockRetryCount() const;
+    void     SetLockRetryCount( xbInt16 iLockRetries );
+    #endif
+
+    xbInt16  xbFopen      ( xbInt16 iOpenMode );
+    xbInt16  xbFopen      ( const xbString &sOpenMode, xbInt16 iShareMode );
+    xbInt16  xbFopen      ( xbInt16 iOpenMode, xbInt16 iShareMode );
+    xbInt16  xbFopen      ( const xbString &sMode, const xbString &sFileName, xbInt16 iShareMode );
+
+    xbInt16  xbFputc      ( xbInt32 c );
+    xbInt16  xbFputc      ( xbInt32 c, xbInt32 iNoTimes );
+    xbInt16  xbFputs      ( const xbString &s );
+    xbInt16  xbFread      ( void *ptr, size_t size, size_t nmemb );
+    xbInt16  xbFgets      ( size_t lSize, xbString &sLine );
+
+    size_t   xbFtell      ();
+    xbInt16  xbFseek      ( xbInt64 llOffset, xbInt32 whence );
+
+    void     xbFTurnOffFileBuffering();
+    xbInt16  xbFwrite     ( const void *ptr, size_t lSize, size_t lNmemb );
+
+    xbInt16  xbReadUntil  ( const char cDelim, xbString &sOut );
+    xbInt16  xbRemove     ( const xbString &sFileName, xbInt16 iOption );
+    xbInt16  xbRemove     ( const xbString &sFileName );
+    xbInt16  xbRemove     ();
+
+    xbInt16  xbRename     ( const xbString &sOldName, const xbString &sNewName );
+    xbInt16  xbRename     ( const xbString &sOldName, const xbString &sNewName, xbInt16 iOption );
+    void     xbRewind     ();
+
+    xbInt16  xbTruncate   ( xbInt64 llSize );
+    xbInt16  NameSuffixMissing( const xbString &sFileName, xbInt16 iOption ) const;
+
+    #ifdef XB_DEBUG_SUPPORT
+    xbInt16  DumpBlockToDisk( xbUInt32 ulBlockNo, size_t lBlockSize );
+    #endif
+
+
+  protected:
+
+    xbXBase *xbase;              /* pointer to the main structures                       */
+
+  private:
+    FILE     *fp;
+    xbString sFqFileName;        /* fully qualified file name                            */
+    xbString sFileName;          /* file name                                            */
+    xbString sDirectory;         /* directory, ends with / or \                          */
+    xbBool   bFileOpen;          /* true if file is open                                 */
+    xbUInt32 ulBlockSize;        /* used for memo and index files                        */
+
+    xbInt16  iOpenMode;          /* XB_READ || XB_READ_WRITE || XB_WRITE                 */
+    xbInt16  iShareMode;         /* XB_SINGLE_USER || XB_MULTI_USER - set file buffering */
+    xbInt32  iFileNo;            /* Library File No                                      */
+
+    #ifdef XB_LOCKING_SUPPORT
+    xbInt16  iLockRetries;       /* file override number of lock attempts                */
+    #endif
+
+    #ifdef HAVE_SETENDOFFILE_F
+    HANDLE   fHandle;
+    #endif
+
+
+};
+
+}        /* namespace     */
+#endif   /*  __XBFILE_H__ */
+
diff --git a/src/include/xbfilter.h b/src/include/xbfilter.h
new file mode 100755
index 0000000..8722256
--- /dev/null
+++ b/src/include/xbfilter.h
@@ -0,0 +1,78 @@
+/*  xbfilter.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+This class manages the user data area (UDA)
+
+*/
+
+
+#ifndef __XB_XBFILTER_H__
+#define __XB_XBFILTER_H__
+
+#ifdef  CMAKE_COMPILER_IS_GNUCC
+#pragma interface
+#endif
+
+
+#ifdef XB_FILTER_SUPPORT
+
+
+namespace xb{
+
+//#ifdef XB_INDEX_SUPPORT
+//class XBDLLEXPORT xbIx;
+//#endif  // XB_INDEX_SUPPORT
+
+
+class XBDLLEXPORT xbFilter {
+
+ public:
+  xbFilter( xbXBase *xbase, xbDbf *dbf );
+  ~xbFilter();
+  xbInt16 Set( xbString &sFilterExpression );
+  xbInt16 GetFirstRecord( xbInt16 iOpt = 1 );
+  xbInt16 GetNextRecord ( xbInt16 iOpt = 1 );
+  xbInt16 GetPrevRecord ( xbInt16 iOpt = 1 );
+  xbInt16 GetLastRecord ( xbInt16 iOpt = 1 );
+  void    SetLimit( xbInt32 ulLimit );
+  xbInt32 GetLimit() const;
+  void    ResetQryCnt();
+  xbInt32 GetQryCnt() const;
+
+  #ifdef XB_INDEX_SUPPORT
+//  void    Set( xbIx *pIx, void *vpTag );
+  xbInt16 GetFirstRecordIx( xbInt16 iOpt = 1 );
+  xbInt16 GetNextRecordIx ( xbInt16 iOpt = 1 );
+  xbInt16 GetPrevRecordIx ( xbInt16 iOpt = 1 );
+  xbInt16 GetLastRecordIx ( xbInt16 iOpt = 1 );
+  #endif  // XB_INDEX_SUPPORT
+
+
+ private:
+  xbXBase  *xbase;
+  xbDbf    *dbf;
+  xbExp    *exp;
+
+  xbInt32  lLimit;           // max number rows returned
+  xbInt32  lCurQryCnt;       // current count of rows returned, neg# is moving from bottom to top
+                             //                                 pos# is moving from top to bottom
+  #ifdef XB_INDEX_SUPPORT
+  xbIx     *pIx;             // if index is set, the class uses the index tag, otherwise table
+  void     *vpTag;
+  #endif  // XB_INDEX_SUPPORT
+
+
+};
+}        /* namespace */
+#endif   /* XB_FILTER_SUPPORT */
+#endif   /* __XBFILTER_H__ */
\ No newline at end of file
diff --git a/src/include/xbindex.h b/src/include/xbindex.h
new file mode 100755
index 0000000..b42f76e
--- /dev/null
+++ b/src/include/xbindex.h
@@ -0,0 +1,605 @@
+/*  xbindex.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014, 2018, 2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+#ifndef __XB_INDEX_H__
+#define __XB_INDEX_H__
+
+#ifdef XB_INDEX_SUPPORT
+
+
+#define XB_ADD_KEY 1
+#define XB_UPD_KEY 2
+#define XB_DEL_KEY 3
+
+namespace xb{
+
+
+
+///@cond DOXYOFF
+// structure for index nodes, each node contains information regarding one block
+struct XBDLLEXPORT xbIxNode {
+  xbIxNode *npPrev;                     // pointer to previous node in chain
+  xbIxNode *npNext;                     // pointer to next node in chain
+  xbUInt32 iCurKeyNo;                   // current key number in the node, 0 offset
+  xbUInt32 ulBlockNo;                   // this block number
+  xbUInt32 ulBufSize;                   // size of cpBlockData
+  char     *cpBlockData;                // pointer to memory version of block data stored in file
+};
+///@endcond DOXYOFF
+
+
+//! @brief Base class for handling dbf indices.
+/*!
+
+The xbIx class is used as a base class for accessing index files.
+Each index file can have one or more tags.
+
+Calls to the index routines to perform index updates are handled automatically by the dbf class. 
+The application program does not need to be concerned with index updates.
+
+If there is a production MDX index, it is opened automatically when the dbf file is opened.
+If there is an ndx file, that has been associated with the dbf file with the metadata routines,
+it will be opened automatically when the dbf file is opened.
+If there are non prod ndx indices that are not associated with the dbf file, the application
+program will need to open as appropriate.
+The meta data association logic is specific to the Xbase64 library and is not applicable to
+other available tools that handle ndx indices.
+All index files are automatically closed when the dbf file is closed.
+
+
+<br>
+The class is designed to support the addition of additional indices with a minimal amount of effort
+needed to integrate into the library.
+If you are looking at adding an new index type to the library, create a derived class using xbIx as a 
+base class and modify methods needed to support the new index file version. 
+The xbDbf class (and derived classes) perform the needed calls to the index routines for updates.<br>
+See the following for examples on how to start on this:<br>
+xbIxNdx is a derived class and supports a single tag.<br>
+xbIxMdx is a derived class and supports multiple tags.<br>
+
+
+
+<br>
+How data fields are stored in index files:
+<table>
+<tr><th>Field Type<th>Stored in DBF as<th>Stored in NDX as<th>Stored in MDX as</tr>
+<tr><td>C<td>char<td>char<td>char
+<tr><td>F<td>text numbers<td>xbDouble<td>xbBcd
+<tr><td>N<td>text numbers<td>xbDouble<td>xbBcd
+<tr><td>D<td>text CCYYMMDD<td>xbDouble - julian<td>xbDouble - julian
+</table>
+
+
+<br>
+Pages Vs Blocks
+<br>
+For purposes of the Xbase index classes, a page is considered to be 512 bytes of data
+and a block is made up of one or more 512 byte pages.
+<br>Default block sixe of NDX indices is one 512 byte page.
+<br>Default block size of MDX indices is two 512 byte pages or 1024 bytes.
+
+<br>The WriteBlock and GetBlock functions calculate the physical position in the 
+file based on a combination of Block Number and Block Size.  Block size is set at
+time of index file creation, default is 1024 or two pages.
+
+<br>Page numbers are stored in the physical file, but block reads and writes 
+are performed.
+
+<br>
+Duplicate Keys
+<br>
+With the original DBase unique indexing option, if a table has multiple records with the
+same key value, DBase would allow multiple records in the table, but only the first
+record would be found in the index.
+<br>
+XBase64 can be configured to support the original DBase duplicate key implementation,
+or can be configured to halt with a DUPLICATE_KEY error on the insertion of a record
+with a duplicate key.
+<br>
+<table>
+<tr><th>Option<th>Description</tr>
+<tr><td>XB_HALT_ON_DUPKEY</td><td>Return error XB_KEY_NOT_UNIQUE when attempting to append record with duplicate key</td></tr>
+<tr><td>XB_EMULATE_DBASE</td><td>Emulate DBase, allow duplicate records with the same key, only the first record is indexed</td></tr>
+</table>
+*/
+
+
+class XBDLLEXPORT xbIx : public xbFile {
+ public:
+   xbIx( xbDbf * d );
+   virtual ~xbIx();
+
+   virtual xbInt16  CheckTagIntegrity( void *vpTag, xbInt16 iOpt ) = 0;
+   virtual xbInt16  Close();
+   virtual xbInt16  CreateTag( const xbString &sName, const xbString &sKey, const xbString &sFilter, xbInt16 iDescending, xbInt16 iUnique, xbInt16 iOverlay, void **vpTag ) = 0;
+   virtual xbInt16  FindKey( void *vpTag, const xbString &sKey, xbInt16 iRetrieveSw );
+   virtual xbInt16  FindKey( void *vpTag, const char * cKey, xbInt32 lKeyLen, xbInt16 iRetrieveSw );
+   virtual xbInt16  FindKey( void *vpTag, const xbBcd &bcd, xbInt16 iRetrieveSw );
+   virtual xbInt16  FindKey( void *vpTag, const xbDate &dtKey, xbInt16 iRetrieveSw );
+   virtual xbInt16  FindKey( void *vpTag, xbDouble dKey, xbInt16 iRetrieveSw );
+   virtual xbInt16  FindKey( void *vpTag, const void *vKey, xbInt32 lKeyLen, xbInt16 iRetrieveSw ) = 0;
+   virtual void     *GetCurTag() const;
+   virtual xbDbf    *GetDbf() const;
+
+   virtual xbString &GetKeyExpression( const void *vpTag ) const = 0;
+   virtual xbString &GetKeyFilter( const void *vpTag ) const = 0;
+   virtual char     GetKeyType( const void *vpTag ) const = 0;
+   virtual xbBool   GetLocked() const;
+
+   virtual xbInt16  GetFirstKey( void *vpTag, xbInt16 iRetrieveSw ) = 0;
+   virtual xbInt16  GetFirstKey( void *vpTag );
+   virtual xbInt16  GetFirstKey();
+
+   virtual xbInt16  GetLastKey( void *vpTag, xbInt16 lRetrieveSw ) = 0;
+   virtual xbInt16  GetLastKey( void *vpTag );
+   virtual xbInt16  GetLastKey();
+
+   virtual xbInt16  GetNextKey( void *vpTag, xbInt16 iRetrieveSw ) = 0;
+   virtual xbInt16  GetNextKey( void *vpTag );
+   virtual xbInt16  GetNextKey();
+
+   virtual xbInt16  GetPrevKey( void *vpTag, xbInt16 iRetrieveSw ) = 0;
+   virtual xbInt16  GetPrevKey( void *vpTag );
+   virtual xbInt16  GetPrevKey();
+
+   virtual void     *GetTag( xbInt16 iTagNo ) const = 0;
+   virtual void     *GetTag( xbString &sTagName ) const = 0;
+   virtual xbInt16  GetTagCount() const = 0;
+
+   virtual xbString &GetTagName( void *vpTag ) const = 0;
+   virtual const char * GetTagName( void *vpTag, xbInt16 iOpt ) const = 0;
+   virtual void     GetTagName( void *vpTag, xbString &sTagName ) {};
+
+   virtual xbBool   GetUnique( void *vpTag ) const = 0;
+   virtual xbBool   GetSortOrder( void *vpTag ) const = 0;
+
+   virtual xbInt16  Open( const xbString &sFileName );
+   virtual xbInt16  Reindex( void **vpTag ) = 0;
+   virtual xbInt16  SetCurTag( xbInt16 iTagNo ) = 0;
+   virtual xbInt16  SetCurTag( xbString &sTagName ) = 0;
+   virtual void     SetCurTag( void * vpCurTag );
+   virtual void     SetLocked( xbBool bLocked );
+
+   virtual void     TestStub( char *s, void *vpTag ) {};
+
+
+   #ifdef XB_DEBUG_SUPPORT
+   virtual xbInt16 DumpFreeBlocks( xbInt16 iOpt = 0 ) { return XB_NO_ERROR; }
+   virtual xbInt16 DumpHeader( xbInt16 iDestOpt = 0, xbInt16 iFmtOpt = 0 ) = 0;
+   virtual xbInt16 DumpIxForTag( void *vpTag, xbInt16 iOutputOpt ) = 0;
+   virtual void    DumpIxNodeChain( void *vpTag, xbInt16 iOutputOpt ) const = 0;
+   virtual xbInt16 DumpNode( void * vpTag, xbIxNode * pNode, xbInt16 iOption ) const;
+   virtual xbInt16 DumpTagBlocks( xbInt16 iOpt = 1, void *vpTag = NULL  ) = 0;
+ 
+   #endif
+
+ protected:
+   friend  class    xbDbf;
+
+   virtual xbInt16  AddKey( void *vpTag, xbUInt32 ulRecNo ) = 0;
+   virtual xbInt16  AddKeys( xbUInt32 ulRecNo );
+   virtual xbIxNode *AllocateIxNode( xbUInt32 ulBufSize = 0, xbInt16 iOption = 0 );
+   virtual xbInt16  BSearchBlock( char cKeyType, xbIxNode *npNode, xbInt32 lKeyLen, const void *vpKey, xbInt32 lSearchKeyLen, xbInt16 &iCompRc, xbBool bDescending = xbFalse ) const;
+   virtual xbInt16  CheckForDupKeys();
+   virtual xbInt16  CheckForDupKey( void *vpTag ) = 0;
+   virtual xbInt16  CompareKey( char cKeyType, const void *v1, const void *v2, size_t lKeyLen ) const;
+   virtual xbInt16  CreateKeys( xbInt16 iOpt );
+   virtual xbInt16  CreateKey( void * vpTag, xbInt16 iOpt ) = 0;
+   virtual xbInt16  DeleteFromNode( void *vpTag, xbIxNode * npNode, xbInt16 iSlotNo ) = 0;
+//   virtual xbInt16  DeleteKeys( xbUInt32 ulRecNo );
+   virtual xbInt16  DeleteKeys();
+   virtual xbInt16  DeleteKey( void *vpTag ) = 0;
+
+   virtual xbInt16  DeleteTag( void *vpTag ) = 0;
+
+
+   virtual xbInt16  FindKeyForCurRec( void *vpTag ) = 0;
+   virtual xbIxNode *FreeNodeChain( xbIxNode *np );
+   virtual xbInt16  GetBlock( void *vpTag, xbUInt32 ulBlockNo, xbInt16 iOpt, xbUInt32 ulAddlBuf = 0 );
+//   virtual xbBool   GetIndexUpdated() const = 0;
+   virtual xbInt32  GetKeyCount( xbIxNode *npNode ) const;
+   virtual char     *GetKeyData( xbIxNode *npNode, xbInt16 iKeyNo, xbInt16 iKeyItemLen ) const;
+   virtual xbInt16  GetKeySts( void *vpTag ) const = 0;
+   virtual xbInt16  GetLastKey( xbUInt32 ulNodeNo, void *vpTag, xbInt16 lRetrieveSw ) = 0;
+   virtual xbInt16  InsertNodeL( void *vpTag, xbIxNode * npNode, xbInt16 iSlotNo, char * cpKeyBuf, xbUInt32 uiPtr ) = 0;
+   virtual xbInt16  InsertNodeI( void *vpTag, xbIxNode * npNode, xbInt16 iSlotNo, xbUInt32 uiPtr ) = 0;
+   virtual xbInt16  KeyExists( void * ) = 0;
+//   virtual xbInt16  KeyUpdated( void *vpTag ) const = 0;
+   virtual void     NodeFree( xbIxNode * ixNode );
+   virtual xbInt16  ReadHeadBlock( xbInt16 iOpt = 0 ) = 0;
+   virtual void     SetDbf( xbDbf *dbf );
+   virtual xbInt16  SplitNodeL( void *vpTag, xbIxNode * npLeft, xbIxNode *npRight, xbInt16 iSlotNo, char *cpKeyBuf, xbUInt32 uiPtr ) = 0;
+   virtual xbInt16  SplitNodeI( void *vpTag, xbIxNode * npLeft, xbIxNode *npRight, xbInt16 iSlotNo, xbUInt32 uiPtr ) = 0;
+   virtual xbInt16  UpdateTagKey( char cAction, void *vpTag, xbUInt32 ulRecNo = 0 ) = 0;
+   virtual xbInt16  WriteHeadBlock( xbInt16 iOption ) = 0;
+
+   xbDbf *dbf;
+   char  *cNodeBuf;               // pointer to memory for processing in a block of index data
+   void  *vpCurTag;               // pointer to active tag.  Single index files have only one tag
+
+ private:
+   virtual void     AppendNodeChain( void *vpTag, xbIxNode *npNode ) = 0;
+   virtual xbInt16  GetKeyPtr( void *vpTag, xbInt16 iKeyNo, xbIxNode *npNode, xbUInt32 &ulKeyPtr ) const = 0;
+   virtual xbBool   IsLeaf( void *vpTag, xbIxNode *npNode ) const = 0;
+   // virtual void     SetCurNode( void *vpTag, xbIxNode *npNode ) = 0;
+
+   xbBool   bLocked;               // index file locked?
+};
+
+#ifdef XB_NDX_SUPPORT
+
+#define XB_NDX_BLOCK_SIZE 512
+
+
+///@cond DOXYOFF
+struct XBDLLEXPORT xbNdxTag {
+
+   // NDX File Header Fields
+   xbUInt32 ulRootBlock;     // header node is 0
+   xbUInt32 ulTotalBlocks;   // includes header node
+   char     cKeyType;        // C = Char, F = Numeric, D = Date
+   xbInt16  iKeyLen;         // length of key data
+   xbInt16  iKeysPerBlock;   // max number keys per block  <=100
+   xbInt16  iKeyType;        // 00 = Char, 01 = Numeric
+   xbInt16  iKeyItemLen;     // KeyLen + 8 bytes
+   char     cSerNo;          // rolling incrementing serial number +1 on each index update
+   xbInt16  iUnique;         // True if unique
+   xbString sKeyExpression;  // index expression
+   // end of NDX Header field
+
+   xbExp     *exp;           // pointer to expression for expression keys
+   time_t    tNodeChainTs;   // node chain time stamp
+   xbIxNode  *npNodeChain;
+   xbIxNode  *npCurNode;
+   char      *cpKeyBuf;     // key buffer, for searches and adds
+   char      *cpKeyBuf2;    // key buffer, for deletes
+   xbString  sTagName;      // tag name - is the file name without the extension
+//   xbInt16   iKeyUpdated;   // key updated?  set in method KeyUpdated, checked in AddKey and DeleteKey routines
+   xbBool    bFoundSts;     // key found?  used to determine if new key should be added in XB_EMULATE_DBASE mode in AddKey
+
+
+   xbInt16   iKeySts;       // key updated?  set in method CreateKey, checked in AddKey and DeleteKey routines
+                            //   old key filtered     new key filtered   iKeySts
+                            //       Y                      Y              XB_UPD_KEY  2 - update key if changed (delete and add)
+                            //       Y                      N              XB_DEL_KEY  3 - delete key
+                            //       N                      Y              XB_ADD_KEY  1 - add key
+                            //       N                      N                          0 - no update
+
+};
+///@endcond DOXYOFF
+
+//! @brief Class for handling NDX single tag indices.
+/*!
+
+The xbIxNdx class is derived from the xbIx base class and is specific to handling NDX single tag index files.
+Each NDX index file can have only one tag, but the methods are set up to take an argument for a specific tag.
+This was done in order to provide a consistant interface across index types.
+
+Calls to the ndx index routines to perform index updates are handled automatically be the dbf class after
+the ndx file has been opened.
+
+Xbase64 provides a mechanism to automatically open ndx files when a dbf file is opened.
+If the ndx file has been associated with the dbf file with the metadata routines,
+it will be opened automatically when the dbf file is opened.
+If there are non prod ndx indices that are not associated with the dbf file, the application
+program will need to open as appropriate.
+The meta data association logic is specific to the Xbase64 library and is not applicable to
+other available tools that handle ndx indices.
+
+*/
+
+class XBDLLEXPORT xbIxNdx : public xbIx {
+ public:
+   xbIxNdx( xbDbf * d );
+   ~xbIxNdx();
+   xbInt16  CheckTagIntegrity( void *vpTag, xbInt16 iOpt );
+   xbInt16  CreateTag( const xbString &sName, const xbString &sKey, const xbString &sFilter, xbInt16 iDescending, xbInt16 iUnique, xbInt16 iOverlay, void **vpTag );
+//  xbInt16  DeleteTag( void *vpTag );
+   xbInt16  FindKey( void *vpTag, const void *vpKey, xbInt32 lKeyLen, xbInt16 iRetrieveSw );
+   xbInt16  GetFirstKey( void *vpTag, xbInt16 iRetrieveSw );
+
+   xbInt16  GetLastKey( void *vpTag, xbInt16 iRetrieveSw = 1 );
+   xbInt16  GetNextKey( void *vpTag, xbInt16 iRetrieveSw = 1 );
+   xbInt16  GetPrevKey( void *vpTag, xbInt16 iRetrieveSw = 1 );
+   xbInt32  GetKeyLen  ( const void *vpTag ) const;
+   char     GetKeyType ( const void *vpTag ) const;
+   xbString &GetKeyExpression( const void *vpTag ) const;
+   xbString &GetKeyFilter( const void *vpTag ) const;
+   void     *GetTag( xbInt16 iTagNo ) const;
+   void     *GetTag( xbString &sTagName ) const;
+   xbString &GetTagName( void *vpTag ) const;
+   const char * GetTagName( void *vpTag, xbInt16 iOpt ) const;
+
+   xbInt16  GetTagCount() const;
+   xbBool   GetUnique( void *vpTag = NULL ) const;
+   xbBool   GetSortOrder( void *vpTag ) const;
+   xbInt16  Reindex( void **vpTag );
+   xbInt16  SetCurTag( xbInt16 iTagNo );
+   xbInt16  SetCurTag( xbString &sTagName );
+
+
+
+   #ifdef XB_DEBUG_SUPPORT
+   xbInt16 DumpTagBlocks( xbInt16 iOpt = 1, void *vpTag = NULL  );
+   xbInt16 DumpHeader( xbInt16 iOpt = 0, xbInt16 iFmt = 0 );
+   xbInt16 DumpIxForTag( void *vpTag, xbInt16 iOutputOpt );
+   void    DumpIxNodeChain( void *vpTag, xbInt16 iOutputOpt ) const;
+   xbInt16 DumpNode( void * vpTag, xbIxNode * pNode, xbInt16 iOption ) const;
+   #endif
+
+ protected:
+   friend   class xbDbf;
+   xbInt16  AddKey( void *vpTag, xbUInt32 ulRecNo );
+   xbIxNode *AllocateIxNode( xbUInt32 ulBufSize = 0, xbInt16 iOption = 0 );
+   xbInt16  CheckForDupKey( void *vpTag );
+   xbIxNode *CreateIxNode( xbUInt32 ulBufSize );
+   xbInt16  CreateKey( void * vpTag, xbInt16 iOpt );
+   xbInt16  DeleteFromNode( void *vpTag, xbIxNode * npNode, xbInt16 iSlotNo );
+   xbInt16  DeleteKey( void *vpTag );
+
+   xbInt16  DeleteTag( void *vpTag );
+
+   xbInt16  FindKeyForCurRec( void *vpTag );
+//   xbBool   GetIndexUpdated() const;
+   xbInt16  GetKeyTypeN( const void *vpTag ) const;
+   xbInt16  GetKeySts( void *vpTag ) const;
+   xbInt16  GetLastKey( xbUInt32 ulNodeNo, void *vpTag, xbInt16 iRetrieveSw = 1 );
+   xbInt16  InsertNodeI( void *vpTag, xbIxNode * npNode, xbInt16 iSlotNo, xbUInt32 uiPtr );
+   xbInt16  InsertNodeL( void *vpTag, xbIxNode * npNode, xbInt16 iSlotNo, char * cpKeyBuf, xbUInt32 uiPtr );
+   xbInt16  KeyExists( void *vpTag = NULL );
+//   xbBool   KeyFiltered( void *vpTag ) const;
+//   xbInt16  KeyUpdated( void *vpTag ) const;
+   xbInt16  ReadHeadBlock(xbInt16 iOpt);   // read the header node of the disk NDX file
+   xbInt16  SplitNodeI( void *vpTag, xbIxNode * npLeft, xbIxNode *npRight, xbInt16 iSlotNo, xbUInt32 uiPtr );
+   xbInt16  SplitNodeL( void *vpTag, xbIxNode * npLeft, xbIxNode *npRight, xbInt16 iSlotNo, char *cpKeyBuf, xbUInt32 uiPtr );
+   xbInt16  UpdateTagKey( char cAction, void *vpTag, xbUInt32 ulRecNo = 0 );
+   xbInt16  WriteHeadBlock( xbInt16 iOption );
+
+ private:
+   xbInt16  AddKeyNewRoot( xbNdxTag *npTag, xbIxNode *npLeft, xbIxNode *npRight );
+   void     AppendNodeChain( void *vpTag, xbIxNode *npNode );
+   xbInt16  GetDbfPtr( void *vpTag, xbInt16 iKeyNo, xbIxNode *npNode, xbUInt32 &ulDbfPtr ) const;
+   xbInt16  GetKeyPtr( void *vpTag, xbInt16 iKeyNo, xbIxNode *npNode, xbUInt32 &ulKeyPtr ) const;
+   xbInt16  GetLastKeyForBlockNo( void *vpTag, xbUInt32 ulBlockNo, char *cpKeyBuf );
+   xbBool   IsLeaf( void *vpTag, xbIxNode *npNode ) const;
+   xbInt16  KeySetPosAdd( xbNdxTag *npTag, xbUInt32 ulAddKeyRecNo );
+   xbInt16  KeySetPosDel( xbNdxTag *npTag );
+   // void     SetCurNode( void *vpTag, xbIxNode *np );
+   xbNdxTag *ndxTag;
+};
+
+#endif   /* XB_NDX_SUPPORT */
+
+
+#ifdef XB_MDX_SUPPORT
+//#define XB_MDX_BLOCK_SIZE 1024
+
+struct XBDLLEXPORT xbMdxTag {
+
+  // next 7 fields comprise the tag table entry
+  xbUInt32      ulTagHdrPageNo;   // 512 byte page number, NOT block number
+  char          cTagName[11];
+  char          cKeyFmt;          // always 0x10 w/ DBase V7
+  char          cLeftChild;       // cFwdTagThread
+  char          cRightChild;      // cFwdTagThread2
+  char          cParent;          // cBwdTagThread
+  char          c2;
+  char          cKeyType;         // C,D,N
+
+  xbUInt32      ulRootPage;       // 512 byte page number, NOT block number
+  xbUInt32      ulTagSize;        // Number of 512 byte pages allocated to the tag.   Tag size of two is a single 1024 block
+
+  char          cKeyFmt2;         // 0x10 - base
+                                  // 0x08 - descending
+                                  // 0x40 - unique
+  char          cKeyType2;
+  // one unused byte fits here
+
+  char          cTag11;          // dbase sets to 0x1B
+
+  xbInt16       iKeyLen;
+  xbInt16       iKeysPerBlock;
+  xbInt16       iSecKeyType;
+  xbInt16       iKeyItemLen;    // iKeyLen + 4
+
+  char          cSerialNo;      // Increments +1 for each tag update
+  char          cUnique;
+  xbString      *sKeyExp;       // Key expression
+
+  char          cHasFilter;     // 0x00 or 0x01
+  char          cHasKeys;       // 0x00 or 0x01
+
+  xbUInt32      ulLeftChild;    // dbase 7 sets this to the root page on tag creation
+  xbUInt32      ulRightChild;   // dbase 7 sets this to the root page on tag creation
+
+  char          cTagYY;
+  char          cTagMM;
+  char          cTagDD;
+
+  char          cKeyFmt3;      // dbase 7 sets this 0x01 if discreet field or 0x00 if calculated or combination field key expression on tag creation
+
+  xbString      *sFiltExp;     // Filter expression
+
+  time_t        tNodeChainTs;
+  xbIxNode      *npNodeChain;
+  xbIxNode      *npCurNode;
+  xbExp         *exp;          // pointer to expression for expression based tags
+  xbExp         *filter;       // pointer to expression for index filter
+
+  char          *cpKeyBuf;     // key buffer
+  char          *cpKeyBuf2;    // key buffer
+//  xbBool        iKeyUpdated;   // key updated?  set in method CreateKey, checked in AddKey and DeleteKey routines
+                               // 0 - no update
+                               // 1 - Add
+                               // 2 - Update
+                               // 3 - Delete
+//  xbBool        bKeyFiltered;  // key filtered?  True if included key, False if excluded key.  Set in method CreateKey, checked in AddKey and DeleteKey routines
+  xbString      *sTagName;     // string tag name
+
+
+  xbMdxTag      *next;
+  xbBool        bFoundSts;     // key found?  used to determine if new key should be added in XB_EMULATE_DBASE mode in AddKey
+
+
+  xbInt16       iKeySts;       // key updated?  set in method CreateKey, checked in AddKey and DeleteKey routines
+                               //   old key filtered     new key filtered   iKeySts
+                               //       Y                      Y              XB_UPD_KEY  2 - update key if changed (delete and add)
+                               //       Y                      N              XB_DEL_KEY  3 - delete key
+                               //       N                      Y              XB_ADD_KEY  1 - add key
+                               //       N                      N                          0 - no update
+
+
+};
+
+
+class XBDLLEXPORT xbIxMdx : public xbIx {
+ public:
+   xbIxMdx( xbDbf * d );
+   ~xbIxMdx();
+   xbInt16  CheckTagIntegrity( void *vpTag, xbInt16 iOpt );
+   xbInt16  CreateTag( const xbString &sName, const xbString &sKey, const xbString &sFilter, xbInt16 iDescending, xbInt16 iUnique, xbInt16 iOverlay, void **vpTag );
+//   xbInt16  DeleteTag( void *vpTag );
+   xbInt16  FindKey( void *vpTag, const void *vKey, xbInt32 lKeyLen, xbInt16 iRetrieveSw );
+   xbInt16  FindKey( void *vpTag, xbDouble dKey, xbInt16 iRetrieveSw );
+   xbInt16  GetFirstKey( void *vpTag, xbInt16 lRetrieveSw );
+   xbString &GetKeyExpression( const void *vpTag ) const;
+   xbString &GetKeyFilter( const void *vpTag ) const;
+   char     GetKeyType( const void *vpTag ) const;
+   xbInt16  GetLastKey( void *vpTag, xbInt16 lRetrieveSw );
+   xbInt16  GetNextKey( void *vpTag, xbInt16 lRetrieveSw );
+   xbInt16  GetPrevKey( void *vpTag, xbInt16 lRetrieveSw );
+   xbBool   GetReuseEmptyNodesSw() const;
+   xbBool   GetSortOrder( void *vpTag ) const;
+   void     *GetTag( xbInt16 iTagNo ) const;
+   void     *GetTag( xbString &sTagName ) const;
+   xbInt16  GetTagCount() const;
+
+   xbString &GetTagName( void *vpTag ) const;
+   const char * GetTagName( void *vpTag, xbInt16 iOpt ) const;
+   void     GetTagName( void *vpTag, xbString &sTagName );
+
+   xbInt16  GetUnique( void *vpTag ) const;
+   xbInt16  Reindex( void **vpTag );
+   xbInt16  SetCurTag( xbInt16 iTagNo );
+   xbInt16  SetCurTag( xbString &sTagName );
+   void     SetReuseEmptyNodesSw( xbBool bReuse );
+
+   void     TestStub( char *s, void *vpTag );
+
+ protected:
+   friend   class xbDbf;
+
+   xbInt16  AddKey( void *vpTag, xbUInt32 ulRecNo );
+   xbIxNode *AllocateIxNode( xbMdxTag * mpTag, xbUInt32 ulBufSize, xbUInt32 ulBlock2 );
+   xbInt16  CheckForDupKey( void *vpTag );
+   xbInt16  Close();
+   xbInt16  CreateKey( void * vpTag, xbInt16 iOpt );
+   xbInt16  DeleteFromNode( void *vpTag, xbIxNode * npNode, xbInt16 iSlotNo );
+   xbInt16  DeleteKey( void *vpTag );
+
+   xbInt16  DeleteTag( void *vpTag );
+
+   xbInt16  FindKeyForCurRec( void *vpTag );
+   xbInt16  GetKeySts( void *vpTag ) const;
+   xbInt16  GetLastKey( xbUInt32 ulBlockNo, void *vpTag, xbInt16 lRetrieveSw );
+   void     *GetTagTblPtr() const;
+   void     Init( xbInt16 iOpt = 0 );
+   xbInt16  InsertNodeI( void *vpTag, xbIxNode *npNode, xbInt16 iSlotNo, xbUInt32 uiPtr );
+   xbInt16  InsertNodeL( void *vpTag, xbIxNode *npNode, xbInt16 iSlotNo, char *cpKeyBuf, xbUInt32 uiPtr );
+   xbInt16  KeyExists( void * );
+   xbInt16  LoadTagTable();
+   xbInt16  ReadHeadBlock(xbInt16 iOpt);   // read the header node of the disk file
+   xbInt16  SplitNodeI( void *vpTag, xbIxNode * npLeft, xbIxNode *npRight, xbInt16 iSlotNo, xbUInt32 uiPtr );
+   xbInt16  SplitNodeL( void *vpTag, xbIxNode * npLeft, xbIxNode *npRight, xbInt16 iSlotNo, char *cpKeyBuf, xbUInt32 uiPtr );
+   xbInt16  UpdateTagKey( char cAction, void *vpTag, xbUInt32 ulRecNo = 0 );
+   xbInt16  WriteHeadBlock( xbInt16 iOption );
+
+   #ifdef XB_DEBUG_SUPPORT
+   xbInt16  DumpTagBlocks( xbInt16 iOpt = 1, void *vpTag = NULL  );
+   xbInt16  DumpFreeBlocks( xbInt16 iOpt = 0 );
+   xbInt16  DumpHeader( xbInt16 iOpt = 0, xbInt16 iFmtOpt = 0 );
+   xbInt16  DumpIxForTag( void *vpTag, xbInt16 iOutputOpt );
+   void     DumpIxNodeChain( void *vpTag, xbInt16 iOutputOpt ) const;
+   #endif
+
+ private:
+   xbInt16  AddKeyNewRoot( xbMdxTag *npTag, xbIxNode *npLeft, xbIxNode *npRight );
+   void     AppendNodeChain( void *vpTag, xbIxNode *npNode );
+   xbUInt32 BlockToPage( xbUInt32 ulBlockNo );
+   void     CalcBtreePointers();
+   char     CalcTagKeyFmt( xbExp &exp );
+   char     CalcTagFwdThread1();
+   char     CalcTagFwdThread2();
+   xbMdxTag *ClearTagTable();
+   xbInt16  DumpBlock( xbInt16 iOpt, xbUInt32 ulBlockNo, xbMdxTag * mpTag );
+   xbInt16  GetDbfPtr( void *vpTag, xbInt16 iKeyNo, xbIxNode *npNode, xbUInt32 &ulDbfPtr ) const;
+   xbInt16  GetKeyPtr( void *vpTag, xbInt16 iKeyNo, xbIxNode *npNode, xbUInt32 &ulKeyPtr ) const;
+   xbInt16  GetLastKeyForBlockNo( void *vpTag, xbUInt32 ulBlockNo, char *cpKeyBuf );
+   xbInt16  HarvestEmptyNode( xbMdxTag *mpTag, xbIxNode *npNode, xbInt16 iOpt, xbBool bHarvestRoot = xbFalse );
+   xbInt16  HarvestTagNodes( xbMdxTag *mpTag, xbBool bRecycleRoot = xbFalse );
+   xbBool   IsLeaf( void *vpTag, xbIxNode *npNode ) const;
+   xbInt16  KeySetPosAdd( xbMdxTag *mpTag, xbUInt32 ulAddKeyRecNo );
+   xbInt16  KeySetPosDel( xbMdxTag *mpTag );
+   xbInt16  LoadTagDetail( xbInt16 iOption, xbMdxTag *tte );
+   xbUInt32 PageToBlock( xbUInt32 ulPageNo );
+   xbInt16  TagSerialNo( xbInt16 iOption, xbMdxTag *mpTag );
+   xbInt16  UpdateTagSize( xbMdxTag *mpTag, xbUInt32 ulTagSz );
+
+   #ifdef XB_DEBUG_SUPPORT
+   xbInt16  PrintKey( void *vpTag, xbIxNode *npNode, xbInt16 iKeyNo, xbInt16 iDepth, char cType, xbInt16 iOutputOpt );
+   #endif
+
+   // MDX File Header Fields
+   char     cVersion;
+   char     cCreateYY;
+   char     cCreateMM;
+   char     cCreateDD;
+   xbString sFileName;
+   xbInt16  iBlockFactor;          // 1-32 #of 512 byte segments in a block
+
+   // use file version
+   // xbInt16  iBlockSize;         // Stored at the xbFile level
+
+   char     cProdIxFlag;
+   char     cTagEntryCnt;
+   xbInt16  iTagLen;
+   xbInt16  iTagUseCnt;
+   char     cNextTag;             // byte 28 +1
+   char     c1B;                  // always 0x1B
+   xbUInt32 ulPageCnt;            // number of 512 byte pages in the mdx file
+   xbUInt32 ulFirstFreePage;      // page number corresponding to the next free block
+   xbUInt32 ulNoOfBlockAvail;     // might be improperly named??  not sure how it is used
+   char     cUpdateYY;
+   char     cUpdateMM;
+   char     cUpdateDD;
+   // end of MDX Header fields
+
+
+
+   xbMdxTag *mdxTagTbl;
+
+   xbBool    bReuseEmptyNodes;     // Reuese empty MDX nodes when all keys deleted?
+                                   // DBase 7.x and MS ODBC drivers do not reuse empty nodes, leaves them stranded in the file
+                                   // Codebase 6.x reuses empty nodes.
+                                   // Setting this to True will reuse empty nodes in the same manner Codebase 6.x reuses them.
+
+};
+#endif   /* XB_MDX_SUPPORT */
+ 
+
+}        /* namespace xb     */
+#endif   /* XB_INDEX_SUPPORT */
+#endif   /* __XB_INDEX_H__   */
diff --git a/src/include/xblnklst.h b/src/include/xblnklst.h
new file mode 100755
index 0000000..eaec587
--- /dev/null
+++ b/src/include/xblnklst.h
@@ -0,0 +1,257 @@
+/*  xblnklst.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+#ifndef __XB_XBLNKLST_H__
+#define __XB_XBLNKLST_H__
+
+#ifdef XB_LINKLIST_SUPPORT
+
+namespace xb{
+
+
+template<class xbNodeType>
+class XBDLLEXPORT xbLinkList {
+  public:
+   xbLinkList();
+   ~xbLinkList();
+
+   xbLinkListNode<xbNodeType> *GetHeadNode() const;
+   xbLinkListNode<xbNodeType> *GetEndNode() const;
+   xbLinkListNode<xbNodeType> *GetNodeForNo( xbUInt32 ulNodeNo ) const;
+
+   void        Clear();
+   xbUInt32    GetNodeCnt     () const;
+   xbInt16     InsertAtEnd    ( const xbNodeType &xbLLN );
+   xbInt16     InsertAtFront  ( const xbNodeType &xbLLN );
+   xbInt16     RemoveByVal    ( const xbNodeType &xbLLN );
+   xbInt16     RemoveFromEnd  ();
+   xbInt16     RemoveFromEnd  ( xbNodeType &xbLLN );
+   xbInt16     RemoveFromFront( xbNodeType &xbLLN );
+   xbInt16     SearchFor      ( const xbNodeType &xbLLN );
+
+  private:
+   xbUInt32 ulNodeCnt;
+   xbLinkListNode<xbNodeType> *llStartPtr;
+   xbLinkListNode<xbNodeType> *llEndPtr;
+};
+
+template<class xbNodeType>
+xbLinkList<xbNodeType>::xbLinkList(){
+  ulNodeCnt  = 0;
+  llStartPtr = NULL;
+  llEndPtr   = NULL;
+}
+
+template<class xbNodeType>
+xbLinkList<xbNodeType>::~xbLinkList(){
+  Clear();
+}
+
+template<class xbNodeType>
+void xbLinkList<xbNodeType>::Clear(){
+  xbLinkListNode<xbNodeType> *cPtr = llStartPtr, *tPtr;
+  for( xbUInt32 i = 0; i < ulNodeCnt; i++ ){
+    tPtr = cPtr;
+    cPtr = cPtr->GetNextNode();
+    delete tPtr;
+  }
+  ulNodeCnt  = 0;
+  llStartPtr = NULL;
+  llEndPtr   = NULL;
+}
+
+
+template<class xbNodeType>
+xbLinkListNode<xbNodeType> *xbLinkList<xbNodeType>::GetHeadNode() const{
+  return llStartPtr;
+}
+
+template<class xbNodeType>
+xbLinkListNode<xbNodeType> *xbLinkList<xbNodeType>::GetEndNode() const{
+  return llEndPtr;
+}
+
+
+template<class xbNodeType>
+xbLinkListNode<xbNodeType> *xbLinkList<xbNodeType>::GetNodeForNo( xbUInt32 ulNo ) const{
+
+  xbLinkListNode<xbNodeType> *cPtr = llStartPtr;
+  xbUInt32 i;
+  for( i = 0; i < ulNo && i < ulNodeCnt; i++ )
+    cPtr = cPtr->GetNextNode();
+
+  if( i == ulNo )
+    return cPtr;
+  else 
+    return 0;
+}
+
+
+
+template<class xbNodeType>
+xbUInt32 xbLinkList<xbNodeType>::GetNodeCnt() const{
+  return ulNodeCnt;
+}
+
+template<class xbNodeType>
+xbInt16 xbLinkList<xbNodeType>::InsertAtFront( const xbNodeType & ntKey ){
+
+  xbLinkListNode<xbNodeType> *p = new xbLinkListNode<xbNodeType>( ntKey );
+  if( p == 0 )
+    return XB_NO_MEMORY;
+
+  if( ulNodeCnt > 0 ){
+    llStartPtr->SetPrevNode( p );
+    p->SetNextNode( llStartPtr );
+  } else {
+    llEndPtr = p;
+  }
+
+  llStartPtr = p;
+  ulNodeCnt++;
+  return XB_NO_ERROR;
+}
+
+template<class xbNodeType>
+xbInt16 xbLinkList<xbNodeType>::InsertAtEnd( const xbNodeType & ntKey ){
+
+  xbLinkListNode<xbNodeType> *p = new xbLinkListNode<xbNodeType>( ntKey );
+  if( p == 0 )
+    return XB_NO_MEMORY;
+
+  if( ulNodeCnt > 0 ){
+    llEndPtr->SetNextNode( p );
+    p->SetPrevNode( llEndPtr );
+    llEndPtr = p;
+  } else {
+    llStartPtr = p;
+  }
+
+  llEndPtr = p;
+  ulNodeCnt++;
+  return XB_NO_ERROR;
+}
+
+
+
+template<class xbNodeType>
+xbInt16 xbLinkList<xbNodeType>::RemoveByVal( const xbNodeType & ntKey ){
+  // Remove the first instance of ntKey from the node chain
+  xbLinkListNode<xbNodeType> *currPtr = llStartPtr;
+  xbLinkListNode<xbNodeType> *prevPtr = NULL;
+
+  for( xbUInt32 i = 0; i < ulNodeCnt; i++ ){
+    if( currPtr->GetKey() == ntKey ){
+      if( prevPtr == NULL ){                   //then this is the first node
+        llStartPtr = currPtr->GetNextNode();
+        if( llStartPtr )                      // if more than one link in the linked list
+          llStartPtr->SetPrevNode( NULL );
+        delete currPtr;
+        ulNodeCnt--;
+        return i + 1;
+      }
+      else {
+        prevPtr->SetNextNode( currPtr->GetNextNode());
+        if( currPtr->GetNextNode())
+          currPtr->GetNextNode()->SetPrevNode( prevPtr );
+        delete currPtr;
+        ulNodeCnt--;
+        return i + 1;
+      }
+    }
+    prevPtr = currPtr;
+    currPtr = currPtr->GetNextNode();
+  }
+  return XB_NOT_FOUND;
+}
+
+
+template<class xbNodeType>
+xbInt16 xbLinkList<xbNodeType>::RemoveFromFront( xbNodeType & ntKey ){
+
+  if( ulNodeCnt <= 0 )
+    return XB_INVALID_NODELINK;
+  xbLinkListNode<xbNodeType> *p = llStartPtr;
+  llStartPtr = p->GetNextNode();
+  if( llStartPtr )
+    llStartPtr->SetPrevNode( NULL );
+  ntKey = p->GetKey();
+  delete p;
+  ulNodeCnt--;
+  return XB_NO_ERROR;
+}
+
+
+template<class xbNodeType>
+xbInt16 xbLinkList<xbNodeType>::RemoveFromEnd( xbNodeType & ntKey ){
+
+  if( ulNodeCnt <= 0 )
+    return XB_INVALID_NODELINK;
+  xbLinkListNode<xbNodeType> *p = llEndPtr;
+  if( p->GetPrevNode()){
+    llEndPtr = p->GetPrevNode();
+    llEndPtr->SetNextNode( NULL );
+  } else {
+    // there are no more nodes
+    llStartPtr = NULL;
+    llEndPtr   = NULL;
+  }
+  ntKey = p->GetKey();
+  delete p;
+  ulNodeCnt--;
+  return XB_NO_ERROR;
+}
+
+
+template<class xbNodeType>
+xbInt16 xbLinkList<xbNodeType>::RemoveFromEnd(){
+
+  if( ulNodeCnt <= 0 )
+    return XB_INVALID_NODELINK;
+  xbLinkListNode<xbNodeType> *p = llEndPtr;
+  if( p->GetPrevNode()){
+    llEndPtr = p->GetPrevNode();
+    llEndPtr->SetNextNode( NULL );
+  } else {
+    // there are no more nodes
+    llStartPtr = NULL;
+    llEndPtr   = NULL;
+  }
+  delete p->GetKey();
+  delete p;
+  ulNodeCnt--;
+  return XB_NO_ERROR;
+}
+
+
+template<class xbNodeType>
+xbInt16 xbLinkList<xbNodeType>::SearchFor( const xbNodeType & ntKey ){
+
+  xbLinkListNode<xbNodeType> *cPtr = llStartPtr;
+  for( xbUInt32 i = 0; i < ulNodeCnt; i++ ){
+    if( cPtr->GetKey() == ntKey )
+      return i+1;
+    cPtr = cPtr->GetNextNode();
+  }
+  return XB_NO_ERROR;
+
+}
+}               // namespace
+
+#endif          // XB_LINKLIST_SUPPORT
+#endif          // XB_XBLNKLST_H__
+
+
diff --git a/src/include/xblnklstord.h b/src/include/xblnklstord.h
new file mode 100755
index 0000000..d319c31
--- /dev/null
+++ b/src/include/xblnklstord.h
@@ -0,0 +1,367 @@
+/*  xblnklstord.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2019,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+// Ordered link list
+
+
+
+#ifndef __XB_XBLNKLSTORD_H__
+#define __XB_XBLNKLSTORD_H__
+
+#ifdef XB_LINKLIST_SUPPORT
+
+
+namespace xb{
+
+
+template<class xbNodeType>
+class XBDLLEXPORT xbLinkListOrd {
+  public:
+   xbLinkListOrd();
+   ~xbLinkListOrd();
+
+   void    Clear();
+   xbLinkListNode<xbNodeType> *GetHeadNode() const;
+   xbLinkListNode<xbNodeType> *GetEndNode() const;
+   xbLinkListNode<xbNodeType> *GetNodeForKey( const xbString &sKey ) const;
+
+   xbInt16  GetDataForKey  ( const xbNodeType &ntKey, xbString &sData );
+
+   xbBool   GetDupKeys     ();
+
+   xbUInt32 GetNodeCnt     () const;
+   xbUInt32 GetNodeCnt     ( const xbString &sNodeKey ) const;
+   xbInt16  InsertKey      ( const xbNodeType &ntKey );
+   xbInt16  InsertKey      ( const xbNodeType &ntKey, const xbString &sData );
+   xbInt16  InsertKey      ( const xbNodeType &ntKey, xbUInt32 ulData );
+
+   xbBool   KeyExists      ( const xbNodeType &ntKey ) const;
+   xbInt16  RemoveKey      ( const xbNodeType &ntKey );
+   xbInt16  RemoveFromEnd  ( xbNodeType &ntKey );
+   xbInt16  RemoveFromFront( xbNodeType &ntKey );
+   xbInt16  RemoveFromFront();
+   void     SetDupKeys     ( xbBool bAllowDupKeys );
+   xbInt16  UpdateForKey   ( const xbNodeType &ntKey, const xbString &sData );
+ 
+
+  private:
+   xbUInt32   ulNodeCnt;
+   xbBool     bAllowDupKeys;
+   xbLinkListNode<xbNodeType> *llStartPtr;
+   xbLinkListNode<xbNodeType> *llEndPtr;
+
+};
+
+
+template<class xbNodeType>
+xbLinkListOrd<xbNodeType>::xbLinkListOrd(){
+  bAllowDupKeys = xbTrue;             // default setting - allow duplicate keys
+  ulNodeCnt     = 0;
+  llStartPtr    = NULL;
+  llEndPtr      = NULL;
+}
+
+template<class xbNodeType>
+xbLinkListOrd<xbNodeType>::~xbLinkListOrd(){
+  Clear();
+}
+
+template<class xbNodeType>
+void xbLinkListOrd<xbNodeType>::Clear(){
+  xbLinkListNode<xbNodeType> *cPtr = llStartPtr, *tPtr;
+  for( xbUInt32 i = 0; i < ulNodeCnt; i++ ){
+    tPtr = cPtr;
+    cPtr = cPtr->GetNextNode();
+
+    // next line might cause seg faults
+    //   delete tPtr->GetData();
+
+    delete tPtr;
+  }
+  ulNodeCnt = 0;
+  llStartPtr = NULL;
+  llEndPtr   = NULL;
+}
+
+template<class xbNodeType>
+xbLinkListNode<xbNodeType> * xbLinkListOrd<xbNodeType>::GetHeadNode() const{
+  return llStartPtr;
+}
+
+template<class xbNodeType>
+xbLinkListNode<xbNodeType> * xbLinkListOrd<xbNodeType>::GetEndNode() const{
+  return llEndPtr;
+}
+
+template<class xbNodeType>
+xbUInt32 xbLinkListOrd<xbNodeType>::GetNodeCnt() const{
+  return ulNodeCnt;
+}
+
+template<class xbNodeType>
+xbUInt32 xbLinkListOrd<xbNodeType>::GetNodeCnt( const xbString &sNodeKey ) const{
+
+  // won't work if nodekey is not a string
+  xbLinkListNode<xbNodeType> *currPtr = llStartPtr;
+  // skip to sNodeKey
+  while( currPtr && ( sNodeKey > currPtr->GetKey())) {
+    currPtr = currPtr->GetNextNode();
+  }
+  // count entries for sNodeKey
+  xbInt16 iKeyCnt = 0;
+  while( currPtr && ( sNodeKey == currPtr->GetKey())) {
+    iKeyCnt++;
+    currPtr = currPtr->GetNextNode();
+  }
+  return iKeyCnt;
+}
+
+
+template<class xbNodeType>
+xbInt16 xbLinkListOrd<xbNodeType>::InsertKey( const xbNodeType &ntKey ){
+  xbString s;
+  return InsertKey( ntKey, s );
+}
+
+
+
+
+template<class xbNodeType>
+xbInt16 xbLinkListOrd<xbNodeType>::InsertKey( const xbNodeType &ntKey, xbUInt32 ul ){
+
+  xbString s;
+  s.Sprintf( "%ld", ul );
+  return InsertKey( ntKey, s );
+}
+
+
+template<class xbNodeType>
+xbInt16 xbLinkListOrd<xbNodeType>::InsertKey( const xbNodeType &ntKey, const xbString &sData  ){
+
+  xbLinkListNode<xbNodeType> *p = new xbLinkListNode<xbNodeType>( ntKey, sData );
+  if( p == 0 )
+    return XB_NO_MEMORY;
+
+  if( ulNodeCnt > 0 ){
+    xbLinkListNode<xbNodeType> *currPtr = llStartPtr;
+    xbLinkListNode<xbNodeType> *prevPtr = NULL;
+
+    // find location in the chain
+    while( currPtr && ntKey > currPtr->GetKey() ){
+      prevPtr = currPtr;
+      currPtr = currPtr->GetNextNode();
+    }
+    if( currPtr && ntKey == currPtr->GetKey() && bAllowDupKeys == 0 ){
+      delete p;
+      return XB_KEY_NOT_UNIQUE;
+    }
+
+    if( currPtr == NULL ){
+      // std::cout << "at the end of the chain\n";
+      llEndPtr = p;
+      prevPtr->SetNextNode( p );
+      p->SetPrevNode( prevPtr );
+
+    } else if( currPtr->GetPrevNode() == NULL ){
+      // std::cout << "at the beginning of the chain\n";
+      p->SetNextNode( llStartPtr );
+      llStartPtr->SetPrevNode( p );
+      llStartPtr = p;
+
+    } else {
+      // std::cout << "in the middle of the chain\n";
+      p->SetNextNode( currPtr ); 
+      p->SetPrevNode( currPtr->GetPrevNode());
+      currPtr->SetPrevNode( p );
+      prevPtr->SetNextNode( p );
+    }
+  } else {
+    // std::cout << "first addition to the chain\n";
+    llStartPtr = p;
+    llEndPtr = p;
+  }
+  ulNodeCnt++;
+  return XB_NO_ERROR;
+}
+
+template<class xbNodeType>
+xbInt16 xbLinkListOrd<xbNodeType>::RemoveKey( const xbNodeType &ntKey ){
+  // Remove the first instance of ntKey from the node chain
+  xbLinkListNode<xbNodeType> *currPtr = llStartPtr;
+  xbLinkListNode<xbNodeType> *prevPtr = NULL;
+
+  while( currPtr && ntKey > currPtr->GetKey() ){
+    prevPtr = currPtr;
+    currPtr = currPtr->GetNextNode();
+  }
+
+  if( currPtr && ntKey == currPtr->GetKey()){
+//    ntKey = currPtr->GetKey();
+    if( prevPtr == NULL ){                          // this is the first node
+      llStartPtr = currPtr->GetNextNode();
+      // next line fails
+      if( llStartPtr ){
+        llStartPtr->SetPrevNode( NULL );
+      }
+      delete currPtr;
+      ulNodeCnt--;
+      return XB_NO_ERROR;
+    } else if( currPtr->GetNextNode() == NULL ){    // this is the last node
+      llEndPtr = prevPtr;
+      prevPtr->SetNextNode( NULL );
+      delete currPtr;
+      ulNodeCnt--;
+      return XB_NO_ERROR;
+    } else {
+
+      prevPtr->SetNextNode( currPtr->GetNextNode());
+      currPtr->GetNextNode()->SetPrevNode( prevPtr );
+      delete currPtr;
+      ulNodeCnt--;
+      return XB_NO_ERROR;
+    }
+  } else {
+    return XB_NOT_FOUND;
+  }
+}
+
+template<class xbNodeType>
+xbInt16 xbLinkListOrd<xbNodeType>::RemoveFromFront( xbNodeType &ntKey ){
+
+  if( ulNodeCnt <= 0 )
+    return XB_INVALID_NODELINK;
+  xbLinkListNode<xbNodeType> *p = llStartPtr;
+  llStartPtr = p->GetNextNode();
+  if( llStartPtr )
+    llStartPtr->SetPrevNode( NULL );
+  ntKey = p->GetKey();
+  delete p;
+  ulNodeCnt--;
+  return XB_NO_ERROR;
+}
+
+template<class xbNodeType>
+xbInt16 xbLinkListOrd<xbNodeType>::RemoveFromFront(){
+
+  if( ulNodeCnt <= 0 )
+    return XB_INVALID_NODELINK;
+  xbLinkListNode<xbNodeType> *p = llStartPtr;
+  llStartPtr = p->GetNextNode();
+  if( llStartPtr )
+    llStartPtr->SetPrevNode( NULL );
+
+  if( p->GetKey())
+    delete p->GetKey();
+
+  delete p;
+  ulNodeCnt--;
+
+  return XB_NO_ERROR;
+}
+
+
+template<class xbNodeType>
+xbInt16 xbLinkListOrd<xbNodeType>::RemoveFromEnd( xbNodeType &ntKey ){
+
+  if( ulNodeCnt <= 0 )
+    return XB_INVALID_NODELINK;
+  xbLinkListNode<xbNodeType> *p = llEndPtr;
+  llEndPtr = p->GetPrevNode();
+  llEndPtr->SetNextNode( NULL );
+  ntKey = p->GetKey();
+  delete p;
+  ulNodeCnt--;
+  return XB_NO_ERROR;
+}
+
+template<class xbNodeType>
+xbBool xbLinkListOrd<xbNodeType>::GetDupKeys(){
+  return bAllowDupKeys;
+}
+
+template<class xbNodeType>
+void xbLinkListOrd<xbNodeType>::SetDupKeys( xbBool bAllowDupKeys ){
+  this->bAllowDupKeys = bAllowDupKeys;
+}
+
+
+template<class xbNodeType>
+xbBool xbLinkListOrd<xbNodeType>::KeyExists( const xbNodeType &ntKey ) const {
+
+  xbLinkListNode<xbNodeType> *currPtr = llStartPtr;
+  while( currPtr && ntKey > currPtr->GetKey() ){
+    currPtr = currPtr->GetNextNode();
+  }
+  if( currPtr && ntKey == currPtr->GetKey()){
+    return xbTrue;
+  } else {
+    return xbFalse;
+  }
+}
+
+
+template<class xbNodeType>
+xbInt16 xbLinkListOrd<xbNodeType>::GetDataForKey( const xbNodeType &ntKey, xbString &sData ){
+
+  xbLinkListNode<xbNodeType> *currPtr = llStartPtr;
+  while( currPtr && ntKey > currPtr->GetKey() ){
+    currPtr = currPtr->GetNextNode();
+  }
+
+  if( currPtr && ntKey == currPtr->GetKey()){
+    sData = currPtr->GetData();
+    return XB_NO_ERROR;
+  } else {
+    return XB_NOT_FOUND;
+  }
+}
+
+
+template<class xbNodeType>
+xbInt16 xbLinkListOrd<xbNodeType>::UpdateForKey( const xbNodeType &ntKey, const xbString &sData ){
+ 
+  if( ulNodeCnt == 0 )
+    return InsertKey( ntKey, sData );
+  xbLinkListNode<xbNodeType> * currPtr = llStartPtr;
+  xbLinkListNode<xbNodeType> * prevPtr = NULL;
+  while( currPtr && ntKey > currPtr->GetKey() ) {
+    prevPtr = currPtr;
+    currPtr = currPtr->GetNextNode();
+  }
+
+  if( currPtr && ntKey == currPtr->GetKey() ) {
+    xbLinkListNode<xbNodeType> *p = new xbLinkListNode<xbNodeType>( ntKey, sData );
+    if( prevPtr )
+      prevPtr->SetNextNode( p );
+    else
+      llStartPtr = p;
+    p->SetNextNode( currPtr->GetNextNode() );
+    p->SetPrevNode( currPtr->GetPrevNode() );
+    delete currPtr;
+    return XB_NO_ERROR;
+  }
+  
+  return InsertKey( ntKey, sData );
+
+// return 0;
+}
+
+}               // namespace
+
+#endif          // XB_LINKLIST_SUPPORT
+#endif          // XB_XBLNKLSTORD_H__
+
+
diff --git a/src/include/xblnknod.h b/src/include/xblnknod.h
new file mode 100755
index 0000000..ef45be8
--- /dev/null
+++ b/src/include/xblnknod.h
@@ -0,0 +1,94 @@
+/*  xblnknod.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+#ifndef __XB_XBLNKNOD_H__
+#define __XB_XBLNKNOD_H__
+
+
+
+#ifdef XB_LINKLIST_SUPPORT
+
+namespace xb{
+
+template<class xbNodeType>
+class XBDLLEXPORT xbLinkListNode {
+  public:
+   xbLinkListNode( const xbNodeType & );
+   xbLinkListNode( const xbNodeType &, const xbString & );
+   xbNodeType GetKey() const;
+   xbString   &GetData();
+   xbLinkListNode<xbNodeType> *GetNextNode() const;
+   xbLinkListNode<xbNodeType> *GetPrevNode() const;
+   void       SetNextNode( xbLinkListNode<xbNodeType> *llNext );
+   void       SetPrevNode( xbLinkListNode<xbNodeType> *llPrev );
+
+  private:
+   xbNodeType     ntKey;
+   xbString       sData;
+   xbLinkListNode *llNext;
+   xbLinkListNode *llPrev;
+};
+
+ template<class xbNodeType>
+ xbLinkListNode<xbNodeType>::xbLinkListNode( const xbNodeType &key ){
+   ntKey  = key;
+   llNext = NULL;
+   llPrev = NULL;
+ }
+
+ template<class xbNodeType>
+ xbLinkListNode<xbNodeType>::xbLinkListNode( const xbNodeType &key, const xbString &s ){
+   ntKey  = key;
+   sData  = s;
+   llNext = NULL;
+   llPrev = NULL;
+ }
+
+ template<class xbNodeType>
+ xbNodeType xbLinkListNode<xbNodeType>::GetKey() const {
+   return ntKey;
+ }
+
+ template<class xbNodeType>
+ xbString &xbLinkListNode<xbNodeType>::GetData(){
+   return sData;
+ }
+
+ template<class xbNodeType>
+ xbLinkListNode<xbNodeType> *xbLinkListNode<xbNodeType>::GetNextNode() const {
+   return llNext;
+ }
+
+ template<class xbNodeType>
+ xbLinkListNode<xbNodeType> *xbLinkListNode<xbNodeType>::GetPrevNode() const {
+   return llPrev;
+ }
+
+ template<class xbNodeType>
+ void xbLinkListNode<xbNodeType>::SetNextNode( xbLinkListNode<xbNodeType> *lln ){
+   llNext = lln;
+ }
+
+ template<class xbNodeType>
+ void xbLinkListNode<xbNodeType>::SetPrevNode( xbLinkListNode<xbNodeType> *llp ){
+   llPrev = llp;
+ }
+
+}               // namespace
+#endif          // XB_LINKLIST_SUPPORT
+#endif          // XB_XBLNKNOD_H__
+
+
diff --git a/src/include/xblog.h b/src/include/xblog.h
new file mode 100755
index 0000000..e78f476
--- /dev/null
+++ b/src/include/xblog.h
@@ -0,0 +1,66 @@
+/*  xblog.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+#ifndef __XB_XBLOG_H__
+#define __XB_XBLOG_H__
+
+#ifdef  CMAKE_COMPILER_IS_GNUCC
+#pragma interface
+#endif
+
+namespace xb{
+
+#ifdef XB_LOGGING_SUPPORT
+
+//! @brief xbLog class.
+/*!
+The xbLog class handles message logging functions.
+
+If logging is enabled in an application, error messages are printed
+in the log file.
+
+Once a logfile reaches a predefined size, the logfile is closed, renamed
+and opened.
+
+The logging functions can be accessed through the xbXBase class.
+Each application has one of those.
+*/
+
+class XBDLLEXPORT xbLog : public xbFile {
+  public:
+   xbLog();
+   xbLog( const xbString &sLogFileName );
+   ~xbLog();
+
+   xbInt16 LogClose     ();
+   xbInt16 LogGetStatus ();
+   xbInt16 LogOpen      ();
+   void    LogSetStatus ( xbBool bLogStatus );
+   void    LogSetLogSize( size_t lSize );                  //   { LogSize = size; }
+   xbInt16 LogWrite     ( const xbString &LogEntry, xbInt16 iOutputOption = 0 );
+   xbInt16 LogWriteBytes( xbUInt32 lByteCnt, const char *p );
+
+  private:
+   xbBool   bLoggingStatus;        // false = logging off
+                                   // true  = logging on
+   size_t   lLogSize;
+   xbInt16  iShareMode;
+};
+
+#endif          // XB_LOGGING_SUPPORT
+}               // namespace
+#endif          // XB_XBLOG_H__
+
+
diff --git a/src/include/xbmemo.h b/src/include/xbmemo.h
new file mode 100755
index 0000000..e86a65c
--- /dev/null
+++ b/src/include/xbmemo.h
@@ -0,0 +1,223 @@
+/*  xbmemo.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+#ifndef __XB_XBMEMO_H__
+#define __XB_XBMEMO_H__
+
+
+// dont use "#pragma interface" with abstract classes
+// #ifdef  CMAKE_COMPILER_IS_GNUCC
+// #pragma interface
+// #endif
+
+#ifdef XB_MEMO_SUPPORT
+
+
+
+
+namespace xb{
+
+//! @brief Base class for memo files.
+/*!
+
+The xbMemo class is used as a base class for accessing memo files.
+
+Any DBF file which has any memo fields, will also have a DBT file with the same name.
+Memo fields are stored in the DBT file in 512 or 1024 byte sized blocks.
+
+Calls to the memo routines to read and access memo fields are supported from within 
+the dbf class via the GetMemoField and UpdateMemoField routines.
+From an application program point of view, the application program does not need to 
+be concerned with the memo classes.<br>
+
+The main difference between the version 3 and version 4 memo files is that 
+the version 4 files will reclaim and reuse blocks if available. The version 3
+memo file logic does not.<br>
+
+If you are adding a new style memo table to the logic, you can create a new class
+modeled after xbMemoDbt3 or xbDbtMemo4, using the xbMemo class as a base class.
+
+*/
+
+class XBDLLEXPORT xbMemo : public xbFile {
+ public:
+
+  xbMemo( xbDbf *dbf, xbString const &sFileName );
+
+  /* virtual methods */
+  virtual ~xbMemo();
+  virtual xbInt16 Abort              () = 0;
+  virtual xbInt16 CloseMemoFile      ();
+  virtual xbInt16 Commit             () = 0;
+
+  #ifdef XB_LOCKING_SUPPORT
+  virtual xbInt16 LockMemo           ( xbInt16 iLockFunction );
+  virtual xbBool  GetMemoLocked      () const;
+  #endif
+
+  /* pure virtual methods */
+  virtual xbInt16 CreateMemoFile () = 0;
+  
+  virtual xbInt16 GetMemoField   ( xbInt16 iFieldNo, xbString &sMemoData ) = 0;
+  virtual xbInt16 GetMemoFieldLen( xbInt16 iFieldNo, xbUInt32 &ulMemoFieldLen ) = 0;
+  virtual xbInt16 OpenMemoFile   () = 0;
+  virtual xbInt16 GetMemoFileType();
+  virtual xbInt16 PackMemo       ( void (*memoStatusFunc)(xbUInt32 ulItemNum, xbUInt32 ulNumItems)) = 0;
+  virtual xbInt16 UpdateMemoField( xbInt16 iFieldNo, const xbString &sMemoData ) = 0;
+
+  #ifdef XB_DEBUG_SUPPORT
+  virtual xbInt16 DumpMemoFreeChain() = 0;
+  virtual xbInt16 DumpMemoHeader () = 0;
+  #endif
+
+  // *********** FIXME *************
+  // next two methods should be protected but are called in the xb_test_xxxx programs testing routines
+  // so for now, they are kept as public
+  virtual xbInt16 CalcLastDataBlock  ( xbUInt32 &lLastDataBlock );
+  virtual xbInt16 GetHdrNextBlock    ( xbUInt32 &ulBlockNo );
+
+ protected:
+  friend  class   xbDbf;
+
+  virtual xbInt16 ReadDbtHeader     ( xbInt16 iOption ) = 0;
+  virtual xbInt16 UpdateHeaderName  () = 0;
+  virtual xbInt16 UpdateHeadNextNode();
+  virtual xbInt16 Zap            () = 0;
+
+  xbDbf    *dbf;                 /* pointer to related dbf instance                                   */
+  char     cVersion;             /* byte 16 off the header block, 0x03 for V3, version IV - ?         */
+  xbInt16  iMemoFileType;        /* 3 = version  III, 4 = version IV                                  */
+  xbUInt32 ulHdrNextBlock;       /* next available block , bytes 0-3 of the memo header               */
+  void *   mbb;                  /* memo block buffer                                                 */
+
+
+ private:
+
+  #ifdef XB_LOCKING_SUPPORT
+  xbBool bFileLocked;           /* memo file locked */
+  #endif
+
+};
+
+
+
+#ifdef XB_DBF3_SUPPORT
+//! @brief Derived class for version 3 memo files.
+/*!
+
+The xbMemoDbt3 class is derived from the xbMome class and is used for accessing the 
+older Version 3 memo files.
+
+The main difference between the version 3 and version 4 memo files is that 
+the version 4 files will reclaim and reuse blocks if available. The version 3
+memo file logic does not.<br>
+
+*/
+
+
+class XBDLLEXPORT xbMemoDbt3 : public xbMemo {
+ public:
+  xbMemoDbt3( xbDbf *dbf, xbString const &sFileName );
+  ~xbMemoDbt3();
+  virtual xbInt16 Abort          ();
+  virtual xbInt16 Commit         ();
+  virtual xbInt16 CreateMemoFile ();
+  virtual xbInt16 GetMemoField   ( xbInt16 iFieldNo, xbString &sMemoData );
+  virtual xbInt16 GetMemoFieldLen( xbInt16 iFieldNo, xbUInt32 &ulMemoFieldLen );
+  virtual xbInt16 OpenMemoFile   ();
+  virtual xbInt16 PackMemo       ( void (*memoStatusFunc) (xbUInt32 ulItemNum, xbUInt32 ulNumItems));
+  virtual xbInt16 UpdateMemoField( xbInt16 iFieldNo, const xbString &sMemoData );
+
+  #ifdef XB_DEBUG_SUPPORT
+  virtual xbInt16 DumpMemoFreeChain();
+  virtual xbInt16 DumpMemoHeader ();
+  #endif
+
+ protected:
+  virtual xbInt16 ReadDbtHeader( xbInt16 iOption );
+  virtual xbInt16 UpdateHeaderName();
+  virtual xbInt16 Zap();
+
+ private:
+};
+#endif
+
+
+#ifdef XB_DBF4_SUPPORT
+
+//! @brief Derived class for version 4 memo files.
+/*!
+
+The xbMemoDbt4 class is derived from the xbMeme class and is used for accessing the 
+current Version 4 memo files.
+
+The main difference between the version 3 and version 4 memo files is that 
+the version 4 files will reclaim and reuse blocks if available. The version 3
+memo file logic does not.<br>
+*/
+
+class XBDLLEXPORT xbMemoDbt4 : public xbMemo {
+ public:
+  xbMemoDbt4( xbDbf *dbf, xbString const &sFileName );
+  ~xbMemoDbt4();
+  virtual xbInt16 Abort              ();
+  virtual xbInt16 Commit             ();
+  virtual xbInt16 CreateMemoFile     ();
+
+  virtual xbInt16 GetMemoField       ( xbInt16 iFieldNo, xbString &sMemoData );
+  virtual xbInt16 GetMemoFieldLen    ( xbInt16 iFieldNo, xbUInt32 &ulMemoFieldLen );
+  virtual xbInt16 GetMemoFieldLen    ( xbInt16 iFieldNo, xbUInt32 &ulMemoFieldLen, xbUInt32 &lBlockNo );
+  virtual xbInt16 OpenMemoFile       ();
+  virtual xbInt16 PackMemo           ( void (*memoStatusFunc) (xbUInt32 ulItemNum, xbUInt32 ulNumItems));
+  virtual xbInt16 UpdateMemoField    ( xbInt16 iFieldNo, const xbString &sMemoData );
+
+  #ifdef XB_DEBUG_SUPPORT
+  virtual xbInt16 DumpMemoFreeChain  ();
+  virtual xbInt16 DumpMemoHeader     ();
+  virtual xbInt16 DumpMemoInternals  ();
+  virtual xbInt16 ReadFreeBlockHeader( xbUInt32 ulBlockNo, xbUInt32 &ulNextBlock, xbUInt32 &ulFreeBlockCnt );
+  #endif
+
+ protected:
+  virtual xbInt16 FindBlockSetInChain( xbUInt32 ulBlocksNeeded, xbUInt32 &ulLastDataBlock, xbUInt32 &ulLocation, xbUInt32 &ulPrevNode, xbBool &bFound );
+  virtual xbInt16 FreeMemoBlockChain( xbUInt32 ulBlockNo );
+  virtual xbInt16 FreeMemoBlockChain( xbUInt32 ulBlockNo, xbUInt32 &ulLastDataBlock );
+  virtual xbInt16 GetBlockSetFromChain( xbUInt32 ulBlocksNeeded, xbUInt32 ulLocation, xbUInt32 ulPrevNode );
+  virtual xbInt16 ReadDbtHeader( xbInt16 iOption );
+  virtual xbInt16 ReadBlockHeader( xbUInt32 ulBlockNo, xbInt16 iOption );
+  virtual xbInt16 UpdateHeaderName   ();
+  virtual xbInt16 WriteBlockHeader( xbUInt32 ulBlockNo, xbInt16 iOption );
+  virtual xbInt16 Zap();
+
+ private:
+  xbString sDbfFileNameWoExt;
+  xbUInt32 ulNextFreeBlock;
+  xbUInt32 ulFreeBlockCnt;
+  xbInt16  iField1;
+  xbInt16  iStartPos;
+  xbUInt32 ulFieldLen;
+
+  xbLinkList<xbUInt32> llOldBlocks;   // list of previously used memo blocks for field, used by Commit() / Abort()
+  xbLinkList<xbUInt32> llNewBlocks;   // list of newly updated memo blocks for field, used by Commit() / Abort()
+
+};
+#endif
+
+
+}        /* namespace xb   */
+#endif   /* XB_MEMO_SUPPORT */
+#endif   /* __XB_MEMO_H__  */
+
diff --git a/src/include/xbretcod.h b/src/include/xbretcod.h
new file mode 100755
index 0000000..6b73527
--- /dev/null
+++ b/src/include/xbretcod.h
@@ -0,0 +1,94 @@
+/*  xbretcod.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+#ifndef __XB_RETCODES_H__
+#define __XB_RETCODES_H__
+
+/***********************************************/
+/* Return Codes and Error Messages             */
+
+namespace xb{
+
+  #define XB_NO_ERROR                     0       // general
+  #define XB_NO_MEMORY                 -100       // general
+  #define XB_INVALID_OPTION            -101       // general
+  #define XB_DUP_TABLE_OR_ALIAS        -110       // table manager
+  #define XB_INVALID_NODELINK          -120       // linklist
+  #define XB_KEY_NOT_UNIQUE            -121       // linklist
+
+  #define XB_FILE_EXISTS               -200       // file
+  #define XB_ALREADY_OPEN              -201       // file
+  #define XB_DBF_FILE_NOT_OPEN         -202       // file
+  #define XB_FILE_NOT_FOUND            -203       // file
+  #define XB_FILE_TYPE_NOT_SUPPORTED   -204       // file
+  #define XB_RENAME_ERROR              -205       // file
+  #define XB_INVALID_OBJECT            -206       // file
+  #define XB_NOT_OPEN                  -207       // file
+  #define XB_NOT_FOUND                 -208       // file
+  #define XB_OPEN_ERROR                -209       // file
+  #define XB_CLOSE_ERROR               -210       // file
+  #define XB_SEEK_ERROR                -211       // file
+  #define XB_READ_ERROR                -212       // file
+  #define XB_WRITE_ERROR               -213       // file
+  #define XB_EOF                       -214       // file
+  #define XB_BOF                       -215       // file
+  #define XB_INVALID_BLOCK_SIZE        -216       // file
+  #define XB_INVALID_BLOCK_NO          -217       // file
+  #define XB_INVALID_RECORD            -218       // file
+  #define XB_DELETE_FAILED             -219       // file
+  #define XB_INVALID_TABLE_NAME        -220       // file
+  #define XB_EMPTY                     -221       // file
+  #define XB_LIMIT_REACHED             -222       // file
+
+  #define XB_INVALID_FIELD_TYPE        -300       // field
+  #define XB_INVALID_FIELD_NO          -301       // field
+  #define XB_INVALID_DATA              -302       // field
+  #define XB_INVALID_FIELD_NAME        -303       // field
+  #define XB_INVALID_MEMO_FIELD        -304       // field
+  #define XB_INVALID_FIELD             -305       // field
+  #define XB_INVALID_FIELD_LEN         -306       // field
+  #define XB_INVALID_DATE              -307       // date field
+
+  #define XB_INVALID_LOCK_OPTION       -400       // lock
+  #define XB_LOCK_FAILED               -401       // lock
+  #define XB_TABLE_NOT_LOCKED          -402       // lock - need table locked for operation
+
+  #define XB_PARSE_ERROR               -500       // expression
+  #define XB_INVALID_FUNCTION          -501       // expression
+  #define XB_INVALID_PARM              -502       // expression
+  #define XB_INCONSISTENT_PARM_LENS    -503       // expression
+  #define XB_INCOMPATIBLE_OPERANDS     -504       // expression
+  #define XB_UNBALANCED_PARENS         -505       // expression
+  #define XB_UNBALANCED_QUOTES         -506       // expression
+  #define XB_INVALID_EXPRESSION        -507       // expression
+
+  #define XB_INVALID_KEYNO             -600       // index
+  #define XB_INVALID_INDEX             -601       // index file error
+  #define XB_INVALID_TAG               -602       // invalid index tag name, must be <= 10 bytes
+  #define XB_INVALID_PAGE              -603       // invalid index page
+
+
+  #define XB_SYNTAX_ERROR              -700       // sql syntax error
+
+
+  #define XB_MAX_ERROR_NO              -999
+
+
+/* when updating this table, also need to update messages in xbssv.cpp */
+
+
+}        /* namespace */
+#endif   /* __XB_RETCODES_H__ */
+
diff --git a/src/include/xbsql.h b/src/include/xbsql.h
new file mode 100755
index 0000000..3869995
--- /dev/null
+++ b/src/include/xbsql.h
@@ -0,0 +1,69 @@
+/*  xbsql.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+This class manages a list of open tables, open indices are connected to the open tables
+
+*/
+
+
+#ifndef __XB_XBSQL_H__
+#define __XB_XBSQL_H__
+
+#ifdef  CMAKE_COMPILER_IS_GNUCC
+#pragma interface
+#endif
+
+
+#ifdef XB_SQL_SUPPORT
+
+namespace xb{
+
+
+class XBDLLEXPORT xbSql : public xbSsv {
+ public:
+   // xbSql();
+   xbSql( xbXBase *x );
+   ~xbSql();
+
+   xbInt16 ExecuteNonQuery( const xbString &sCmdLine );
+   xbXBase *GetXbasePtr() const;
+
+ protected:
+
+ private:
+
+   xbInt16  SqlCreateTable( const xbString &sCmdLine );
+   xbInt16  SqlCreateIndex( const xbString &sCmdLine );
+
+   xbInt16  SqlDropIndex( const xbString &sCmdLine );
+   xbInt16  SqlDropTable( const xbString &sCmdLine );
+
+
+// xbInt16  SqlCreateView( const xbString &sCmdLine );
+// xbInt16  SqlDropView( const xbString &sCmdLine );
+// xbInt16  SqlUpdate( const xbString &sCmdLine );
+// xbInt16  SqlSelect( const xbString &sCmdLine );
+    
+   void     SqlHelp() const;
+   xbInt16  SqlInsert( const xbString &sCmLine );
+   xbInt16  SqlSet( const xbString &sCmdLine );
+   xbInt16  SqlUse( const xbString &sCmdLine );
+
+   xbXBase *xbase;
+   xbUda   uda;
+
+};
+
+}        /* namespace xb    */
+#endif   /* XB_SQL_SUPPORT  */
+#endif   /* __XB_XBSQL_H__  */
\ No newline at end of file
diff --git a/src/include/xbssv.h b/src/include/xbssv.h
new file mode 100755
index 0000000..80da2d0
--- /dev/null
+++ b/src/include/xbssv.h
@@ -0,0 +1,177 @@
+/*  xbssv.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+#ifndef __XB_XBSSV_H__
+#define __XB_XBSSV_H__
+
+#ifdef  CMAKE_COMPILER_IS_GNUCC
+#pragma interface
+#endif
+
+
+namespace xb{
+
+class XBDLLEXPORT xbXBase;
+
+///@cond DOXYOFF
+struct XBDLLEXPORT xbErrorMessage{
+  xbInt16    iErrorNo;
+  const char *sErrorText;
+};
+///@endcond DOXYOFF
+
+
+//! @brief Class for handling shared system variables.
+/*!
+This class defines static variables which are referenced across class instances.
+
+This class is designed to have the variables set when the xbXBase class constructor is called 
+(xbXBase is a derived class).  The xbXbase class is designed to be called first in an application 
+programs, and it is only called once.  The static values in this class are typically initialized at
+program startup and don't require additional updates.
+
+*/
+
+
+// By design, DBase allows mutliple records in a table all having the same key, but only one entry in a unique index
+// XB_HALT_ON_DUP_KEY tells the library to not allow appending records which generate duplicate keys in a unique index
+//
+#if defined (XB_NDX_SUPPORT) || defined (XB_MDX_SUPPORT)
+#define XB_HALT_ON_DUPKEY 0
+#define XB_EMULATE_DBASE  1
+#endif
+
+
+
+class XBDLLEXPORT xbSsv{
+ public:
+  xbSsv();
+  const static char *ErrorCodeText[];
+
+  void       DisplayError              ( xbInt16 ErrorCode ) const;
+  xbString&  GetDefaultDateFormat      () const;
+  xbString&  GetDataDirectory          () const;
+  xbInt16    GetEndianType             () const;
+
+  const char *GetErrorMessage          ( xbInt16 ErrorCode ) const;
+  void       SetDataDirectory          ( const xbString &sDataDirectory );
+  void       SetDefaultDateFormat      ( const xbString &sDefaultDateFormat );
+
+
+  xbBool     BitSet                    ( unsigned char c, xbInt16 iBitNo ) const;
+  #ifdef XB_DEBUG_SUPPORT
+  void       BitDump                   ( unsigned char c ) const;
+  void       BitDump                   ( char c ) const;
+  #endif
+
+  xbBool     GetDefaultAutoCommit      () const;
+  void       SetDefaultAutoCommit      ( xbBool bDefaultAutoCommit );
+
+  xbString&  GetDefaultLogDirectory    () const;
+  xbString&  GetDefaultLogFileName     () const;
+  void       SetDefaultLogDirectory    ( const xbString &sDefaultLogDirectory );
+
+  xbBool     GetMultiUser              () const;
+  void       SetMultiUser              ( xbBool bMultiUser );
+
+  #if defined (XB_NDX_SUPPORT) || defined (XB_MDX_SUPPORT)
+  xbInt16    GetUniqueKeyOpt           () const;
+  xbInt16    SetUniqueKeyOpt           ( xbInt16 iUniqueKeyOpt );
+  #endif
+
+  #ifdef XB_LOCKING_SUPPORT
+  xbInt16    GetDefaultLockRetries     () const;
+  void       SetDefaultLockRetries     ( xbInt16 iRetryCount );
+  xbInt32    GetDefaultLockWait        () const;
+  void       SetDefaultLockWait        ( xbInt32 lRetryWait );
+  xbInt16    GetDefaultLockFlavor      () const;
+  void       SetDefaultLockFlavor      ( xbInt16 iLockFlavor );
+  xbBool     GetDefaultAutoLock        () const;
+  void       SetDefaultAutoLock        ( xbBool bAutoLock );
+  void       EnableDefaultAutoLock     ();
+  void       DisableDefaultAutoLock    ();
+  #endif
+
+  #ifdef XB_MDX_SUPPORT
+  xbInt16    GetCreateMdxBlockSize() const;
+  xbInt16    SetCreateMdxBlockSize( xbInt16 ulBlockSize );
+  #endif
+
+ protected:
+
+  void       SetEndianType             ();
+
+  static xbInt16  iEndianType;             // B=Big Endian  L=Little Endian
+  static xbString sNullString;             // Null String
+
+
+ private:
+
+  static xbString sDefaultDateFormat;
+  static xbString sDataDirectory;          //Data file directory
+
+  #ifdef XB_LOGGING_SUPPORT
+  static xbString sDefaultLogDirectory;    //Default location to store log files
+  static xbString sDefaultLogFileName;     //Default LogFileName
+  #endif
+
+  static xbInt16  iDefaultFileVersion;     // 3 = DBase 3
+                                           // 4 = DBase 4
+                                           // default version used in CreateTable command
+                                           // can be over ridden at the Xbase level, or table level
+                                           // Different versions can be open simultaneously
+
+  static xbBool   bDefaultAutoCommit;      // Default dbf auto commit switch
+
+  static xbBool   bMultiUser;              // True if multi user mode is turned on
+                                           // Turn this off for better performance in single user mode
+                                           // This needs to be turned on or off before any data tables are opened
+                                           // turning this on after tables are opened, can result in out of date
+                                           // file buffers if multiple users are sharing the files
+
+#ifdef XB_LOCKING_SUPPORT
+  static xbInt32  lDefaultLockWait;        // Number of milliseconds between lock retries
+  static xbInt16  iDefaultLockRetries;     // Number of times to retry a lock before conceding
+  static xbInt16  bDefaultAutoLock;        // Autolocking enabled?
+  static xbInt16  iDefaultLockFlavor;      // 1 = DBase
+                                           // 2 = Clipper   - not developed yet
+                                           // 3 = FoxPro    - not developed yet
+                                           // 9 = Xbase64   - not developed yet
+#endif
+
+
+
+#if defined (XB_NDX_SUPPORT) || defined (XB_MDX_SUPPORT)
+
+  static xbInt16 iUniqueKeyOpt;
+
+  // is one of:
+  //    XB_HALT_ON_DUPKEY
+  //    XB_EMULATE_DBASE
+
+#endif
+
+
+#ifdef XB_MDX_SUPPORT
+  static xbInt16  iCreateMdxBlockSize;     // System level Mdx Block Size
+#endif // XB_MDX_SUPPORT
+
+
+
+};
+
+}        /* namespace xb    */
+#endif   /* __XB_XBSSV_H__ */
\ No newline at end of file
diff --git a/src/include/xbstring.h b/src/include/xbstring.h
new file mode 100755
index 0000000..c2f15cd
--- /dev/null
+++ b/src/include/xbstring.h
@@ -0,0 +1,183 @@
+/*  xbstring.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+#ifndef __XBSTRING_H__
+#define __XBSTRING_H__
+
+#ifdef  CMAKE_COMPILER_IS_GNUCC
+#pragma interface
+#endif
+
+#include <stdlib.h>
+#include <iostream>
+
+namespace xb{
+
+
+//! @brief Class for handling string data.
+
+/*!
+This class defines a basic string class with all the functions one would expect in a string class.
+
+For purposes of the xbString class, a string is defined as a variable sized array of one byte
+characters terminated with a null (0x00 or \0) byte.<br><br>
+
+This version of the xbString class does not support wide (wchar_t) characters.  Perhaps you would 
+be interested in creating a class for supporting wide characters.<br><br>
+
+This string class handle strings in a 1-based (not 0 based) fashion.
+Any string routines taking an offset use a 1-based value. That is, the first position of 
+the string is position 1, not 0.<br><br>  
+
+Position 1 (not 0) is considered the first position in a string.  
+A return of 0 would indicate a not found condition. A return of 1, would be the
+first byte.
+*/
+
+
+class XBDLLEXPORT xbString {
+
+ public:
+  //Various constructors
+  xbString(xbUInt32 size);
+  xbString(char c);
+  xbString(const char *s, xbUInt32 lMaxLen);
+  xbString(const xbString &s);
+  xbString(const char * = "");
+  xbString( xbDouble d );
+  ~xbString();
+
+  //operators
+  xbString &operator= (const xbString &s);
+  xbString &operator= (const char *s);
+  operator const char *() const;
+  char &operator[](xbUInt32 n) const;
+  char &operator[](xbInt32 n) const;
+
+  xbString &operator+=(const xbString &s);
+  xbString &operator+=(const char *s);
+  xbString &operator+=(char c);
+  xbString &operator-=(const xbString &s);
+  xbString &operator-=(const char *s);
+  xbString &operator-=(char c);
+
+  xbBool operator == ( const xbString& ) const;
+  xbBool operator == ( const char * ) const;
+  xbBool operator != ( const xbString& ) const;
+  xbBool operator != ( const char * ) const;
+
+  xbBool operator <  ( const xbString& ) const;
+  xbBool operator >  ( const xbString& ) const;
+  xbBool operator <= ( const xbString& ) const;
+  xbBool operator >= ( const xbString& ) const;
+
+  xbString  operator-( const xbString &s );
+  xbString  operator+( const char *s );
+  xbString  operator+( const xbString &s );
+  xbString  operator+( const char c );
+
+  xbString  &AddBackSlash( char c );
+  xbString  &Append(const xbString &s);
+  xbString  &Append(const char *s);
+  xbString  &Append(const char *s, xbUInt32 iByteCount );
+  xbString  &Append(char c);
+  xbString  &Assign(const char *srcStr, xbUInt32 lStartPos, xbUInt32 lCopyLen );
+  xbString  &Assign(const char *srcStr, xbUInt32 lStartPos );
+  xbString  &Assign(const xbString &s, xbUInt32 pos, xbUInt32 n );
+  xbString  &Assign(const xbString &s, xbUInt32 n );
+
+  xbString  Copy() const;
+  xbUInt32  CountChar( char c ) const;
+  xbUInt32  CountChar( char c, xbInt16 iOpt ) const;
+  xbInt16   CvtHexChar( char &cOut );
+  xbInt16   CvtHexString( xbString &sOut );
+  xbInt16   CvtULongLong( xbUInt64 &ullOut );
+  xbInt16   CvtLongLong( xbInt64 &llOut );
+
+  #ifdef XB_DEBUG_SUPPORT
+  void      Dump( const char *title ) const;
+  void      Dump( const char *title, xbInt16 iOption ) const;
+  void      DumpHex( const char *title ) const;
+  #endif
+
+  xbString  &ExtractElement(const char *src, char delim, xbUInt32 iCnt, xbInt16 iOpt = 0 );
+  char      GetCharacter( xbUInt32 lPos ) const;
+  xbUInt32  GetLastPos(char c) const;
+  xbUInt32  GetLastPos(const char *s) const;
+  char      GetPathSeparator() const;
+  xbUInt32  GetSize() const;
+
+  xbBool    HasAlphaChars() const;
+  xbBool    IsEmpty() const;
+  xbBool    IsNull() const;
+
+  xbString  &Left( xbUInt32 ulLen );
+  xbUInt32  Len() const;                     // returns the length of the string
+  xbString  &Ltrim();
+  xbString  &Ltrunc( xbUInt32 ulCnt );
+
+  xbString  &Mid(xbUInt32 ulPos, xbUInt32 lLen );
+  xbString  &PadLeft( char c, xbUInt32 ulLen );
+  xbString  &PadRight( char c, xbUInt32 ulLen );
+  xbUInt32  Pos(char c) const;
+  xbUInt32  Pos(const char *s) const;
+  xbString  &PutAt(xbUInt32 ulPos, char c);
+
+  xbString  &Remove( xbUInt32 ulPos, xbUInt32 ulN );
+  xbString  &Resize( xbUInt32 lSize );
+  xbString  &Rtrim();
+
+  xbString  &Set( const char *s );
+  xbString  &Set( const xbString &s );
+  xbString  &Set( const char *s, xbUInt32 ulSize );
+  xbString  &SetNum( xbInt32 lNum );
+  xbString  &Sprintf(const char *format, ...);
+
+  const char *Str() const;
+  char      *strncpy( char * cDest, xbUInt32 n ) const;
+  xbString  &SwapChars( char from, char to );
+
+  xbString  &ToLowerCase();
+  xbString  &ToUpperCase();
+  xbString  &Trim();
+
+  xbBool    ValidLogicalValue() const;
+  xbBool    ValidNumericValue() const;
+  xbString  &ZapChar( char c );
+  xbString  &ZapLeadingChar( char c );
+  xbString  &ZapTrailingChar( char c );
+
+  friend std::ostream& operator<< ( std::ostream& os, const xbString& s );
+
+ private:
+
+  static const char * NullString;
+  static       char   cJunkBuf;
+
+  char     *data;          // pointer to actual string data
+  xbUInt32 size;           // size of string plus null terminating byte
+
+  void     ctor(const char *s);
+//  xbUInt32 CalcSprintfBufSize(const char *format, ...);
+
+//  char *   xb_realloc( char *pIn, xbUInt32 iLen );
+
+  // next routine could result in buffer over runs if used with improperly sized buffers
+  char *   xb_strcpy ( char *target, const char *source);
+
+};
+
+}        /* namespace */
+#endif   /* __XBSTRING_H__ */
diff --git a/src/include/xbtag.h b/src/include/xbtag.h
new file mode 100755
index 0000000..9b518a3
--- /dev/null
+++ b/src/include/xbtag.h
@@ -0,0 +1,74 @@
+/*  xbtag.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+#ifndef __XB_XBTAG_H__
+#define __XB_XBTAG_H__
+
+//#ifdef  CMAKE_COMPILER_IS_GNUCC
+//#pragma interface
+//#endif
+
+namespace xb{
+
+
+#ifdef XB_INDEX_SUPPORT
+
+class XBDLLEXPORT xbIx;
+
+
+
+//! @brief xbTag is used for linking index tags to a table (aka dbf file).
+/*!
+
+  Each dbf file (or table) can have zero, one or many tags.
+  Each tag is maintained in a linked list of xbTags.
+
+  NDX index files contain only one index tag.<br>
+  MDX index files can contain one to 47 index tags.  The production MDX file is opened automatically
+  and the tags are  added to the tag list.
+
+*/
+
+class XBDLLEXPORT xbTag {
+
+ public:
+  xbTag( xbIx *pIx, void *vpTag, xbString &sType, xbString &sTagName, xbString &sExpression, xbString &sFilter, xbBool bUnique, xbBool bSort );
+
+  xbIx   *GetIx()                  const;
+  void   *GetVpTag()               const;
+  const  xbString &GetType()       const;
+  const  xbString &GetTagName()    const;
+  const  xbString &GetExpression() const;
+  const  xbString &GetFilter()     const;
+  xbBool GetUnique()               const;
+  xbBool GetSort()                 const;
+
+ private:
+  xbIx     *pIx;
+  void     *vpTag;
+  xbString sType;
+  xbString sTagName;
+  xbString sExpression;
+  xbString sFilter;
+  xbBool   bUnique;
+  xbBool   bSort;          // 0 = Ascending, 1 = Descending
+};
+
+#endif // XB_INDEX_SUPPORT
+
+
+}        /* namespace xb    */
+#endif   /* __XB_TAG_H__ */
diff --git a/src/include/xbtblmgr.h b/src/include/xbtblmgr.h
new file mode 100755
index 0000000..d551002
--- /dev/null
+++ b/src/include/xbtblmgr.h
@@ -0,0 +1,61 @@
+/*  xbtblmgr.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+This class manages a list of open tables, open indices are connected to the open tables
+
+*/
+
+
+#ifndef __XB_XBMGR_H__
+#define __XB_XBMGR_H__
+
+#ifdef  CMAKE_COMPILER_IS_GNUCC
+#pragma interface
+#endif
+
+namespace xb{
+
+class XBDLLEXPORT xbDbf;
+
+/* this structure is a linked list of open tables */
+struct XBDLLEXPORT xbTblList{
+  xbTblList *pNext;
+  xbString  *psTblName;            /* Name of table - same table can be opened multiple times, but must have unique alias */
+  xbString  *psTblAlias;           /* TblAliasName must be unique */
+  xbDbf     *pDbf;
+};
+
+class XBDLLEXPORT xbTblMgr : public xbSsv {
+ public:
+  xbTblMgr();
+  ~xbTblMgr();
+  xbInt16    AddTblToTblList        ( xbDbf *d, const xbString &sTblName );
+  xbInt16    AddTblToTblList        ( xbDbf *d, const xbString &sTblName, const xbString &sTblAlias );
+  xbInt16    DisplayTableList       () const;
+  xbDbf *    GetDbfPtr              ( const xbString &sTblAlias ) const;
+  xbDbf *    GetDbfPtr              ( xbInt16 sItemNo ) const;
+  xbInt16    GetOpenTableCount      () const;
+  xbInt16    RemoveTblFromTblList   ( const xbString &sTblAlias );
+  xbInt16    RemoveTblFromTblList   ( xbDbf *d );
+
+ protected:
+
+ private:
+  xbTblList  * TblList;          // List of open database tables
+  xbInt16    iOpenTableCount;    // Number of open tables
+
+};
+
+}        /* namespace xb   */
+
+#endif   /* __XB_XBMGR_H__ */
\ No newline at end of file
diff --git a/src/include/xbtypes.h b/src/include/xbtypes.h
new file mode 100755
index 0000000..99b6c22
--- /dev/null
+++ b/src/include/xbtypes.h
@@ -0,0 +1,55 @@
+/*  xbtypes.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+#ifndef __XB_XTYPES_H__
+#define __XB_XTYPES_H__
+
+namespace xb{
+
+
+typedef float       xbFloat;
+typedef double      xbDouble;
+typedef short int   xbBool;
+typedef xbUInt64    xbOffT;
+
+
+#define xbTrue  1
+#define xbFalse 0
+
+
+#ifdef HAVE__FILENO_F
+  #define xbFileNo _fileno
+#else
+  #define xbFileNo fileno
+#endif
+
+#ifdef XB_LOCKING_SUPPORT
+ #if defined( HAVE_LONG_LONG )
+  #define LK4026531839 4026531839LL
+  #define LK4026531838 4026531838LL
+  #define LK3026531838 3026531838LL
+  #define LK1000000000 1000000000LL
+ #else
+  #define LK4026531839 4026531839L
+  #define LK4026531838 4026531838L
+  #define LK3026531838 3026531838L
+  #define LK1000000000 1000000000L
+ #endif
+#endif
+
+
+
+}  /* namespace */
+#endif  /*  __XB_XTYPES_H__  */
diff --git a/src/include/xbuda.h b/src/include/xbuda.h
new file mode 100755
index 0000000..84eccee
--- /dev/null
+++ b/src/include/xbuda.h
@@ -0,0 +1,52 @@
+/*  xbuda.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+This class manages the user data area (UDA)
+
+*/
+
+
+#ifndef __XB_XBUDA_H__
+#define __XB_XBUDA_H__
+
+#ifdef  CMAKE_COMPILER_IS_GNUCC
+#pragma interface
+#endif
+
+
+#ifdef XB_EXPRESSION_SUPPORT
+
+
+namespace xb{
+
+class XBDLLEXPORT xbUda {
+
+ public:
+  xbUda();
+  ~xbUda();
+  
+  xbInt16 AddTokenForKey( const xbString &sKey, const xbString &sToken );
+  void    Clear();
+  xbInt16 DelTokenForKey( const xbString &sKey );
+  xbInt16 GetTokenCnt() const;
+  xbInt16 GetTokenForKey( const xbString &sKey, xbString &sData );
+  xbInt16 UpdTokenForKey( const xbString &sKey, const xbString &sToken );
+  void    DumpUda() const;
+  
+ private:
+   xbLinkListOrd<xbString> llOrd;
+
+};
+}        /* namespace */
+#endif   /* XB_EXPRESSION_SUPPORT */
+#endif   /* __XBUDA_H__ */
\ No newline at end of file
diff --git a/src/include/xbxbase.h b/src/include/xbxbase.h
new file mode 100755
index 0000000..204e744
--- /dev/null
+++ b/src/include/xbxbase.h
@@ -0,0 +1,222 @@
+/*  xbxbase.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+#ifndef __XB_XBDBLIST_H__
+#define __XB_XBDBLIST_H__
+
+#ifdef  CMAKE_COMPILER_IS_GNUCC
+#pragma interface
+#endif
+
+namespace xb{
+
+class XBDLLEXPORT xbLog;
+
+/************************************************************************/
+/* 
+    Xbase functions
+
+   Min Parm Count is the minimum number of input parms needed by the function
+
+   Return Type
+       C        Char or string
+       D        Date
+       L        Logical
+       N        Numeric
+       1        Varies - pull return type from first sibling
+       2        Varies - pull return type from second sibling
+*/
+
+#ifdef XB_FUNCTION_SUPPORT
+
+/*
+struct XBDLLEXPORT xbFunctionInfo {
+  const   char * FuncName;          // function name
+  char    ReturnType;               // return type of function
+  xbInt16 iReturnLenCalc;           // used to calculate the function return value is
+                                    // 1 = use value specified in iReturnLenVal
+                                    // 2 = use length of operand specified in col 4
+                                    // 3 = use valued of numeric operand specified in col 4
+                                    // 4 = length of parm 1 * numeric value parm
+                                    // 5 = larger length of parm 2 or length of parm 3
+                                    // 6 = if two or more parms, use numeric value from second parm,
+                                    //     otherwise use col4 value
+  xbInt16 iReturnLenVal;            // Used in combination with iReturnLenCalc
+
+};
+*/
+/*
+static xbFunctionInfo FunctionList[] =
+//    Func       Return  -Rtrn Len-
+//    Name        Type   -Calc Val-
+{
+   { "ABS",       'N',      1,   4 },
+   { "ALLTRIM",   'C',      2,   1 },
+   { "ASC",       'N',      1,   4 },
+   { "AT",        'N',      1,   4 },
+   { "CDOW",      'C',      1,   9 },
+   { "CHR",       'C',      1,   1 },
+   { "CMONTH",    'C',      1,   9 },
+   { "CTOD",      'D',      1,   8 },
+   { "DATE",      'D',      1,   8 },
+   { "DAY",       'N',      1,   4 },
+   { "DEL",       'C',      1,   1 },
+   { "DELETED",   'L',      1,   1 },
+   { "DESCEND",   '1',      2,   1 },
+   { "DOW",       'N',      1,   4 },
+   { "DTOC",      'C',      1,   8 },
+   { "DTOS",      'C',      1,   8 },
+   { "EXP",       'N',      1,   4 },
+   { "IIF",       'C',      5,   0 },
+   { "INT",       'N',      1,   4 },
+   { "ISALPHA",   'L',      1,   1 },
+   { "ISLOWER",   'L',      1,   1 },
+   { "ISUPPER",   'L',      1,   1 },
+   { "LEFT",      'C',      3,   2 },
+   { "LEN",       'N',      1,   4 },
+   { "LOG",       'N',      1,   4 },
+   { "LOWER",     'C',      2,   1 },
+   { "LTRIM",     'C',      2,   1 },
+   { "MAX",       'N',      1,   4 },
+   { "MIN",       'N',      1,   4 },
+   { "MONTH",     'N',      1,   4 },
+   { "RECNO",     'N',      1,   4 },
+   { "RECCOUNT",  'N',      1,   4 },
+   { "REPLICATE", 'C',      4,   0 },
+   { "RIGHT",     'C',      3,   2 },
+   { "RTRIM",     'C',      2,   1 },
+   { "SPACE",     'C',      3,   1 },
+   { "SQRT",      'N',      1,   4 },
+   { "STOD",      'D',      1,   8 },
+   { "STR",       'C',      6,  10 },
+   { "STRZERO",   'C',      3,   2 },
+   { "SUBSTR",    'C',      3,   3 },
+   { "TRIM",      'C',      2,   1 },
+   { "UPPER",     'C',      2,   1 },
+   { "VAL",       'N',      1,   4 },
+   { "YEAR",      'N',      1,   4 },
+   { 0, 0, 0, 0 },
+};
+*/
+#endif
+
+
+
+//! @brief xbXbase class.
+/*!
+  The xbXBase class is the core class that needs to be in every application program.
+*/
+
+class XBDLLEXPORT xbXBase : public xbTblMgr{
+ public:
+  xbXBase();
+  ~xbXBase();
+
+  xbInt16  CloseAllTables();
+  void     DisableMsgLogging();
+  void     EnableMsgLogging ();
+  xbInt16  FlushLog();
+
+  const    xbString &GetLogDirectory () const;
+  const    xbString &GetLogFileName  () const;
+  const    xbString &GetLogFqFileName() const;
+  xbBool   GetLogStatus   () const;
+
+  xbInt16  OpenHighestVersion( const xbString &sTableName, const xbString &sAlias, xbDbf &dbf, int dummy );
+  xbInt16  OpenHighestVersion( const xbString &sTableName, const xbString &sAlias, xbDbf **dbf );
+
+  xbDbf *  Open( const xbString &sTableName, xbInt16 &iRc );
+  xbDbf *  Open( const xbString &sTableName, const xbString &sAlias, xbInt16 iOpenMode, xbInt16 iShareMode, xbInt16 iVersion, xbInt16 &iRc );
+  void     SetLogDirectory( const xbString &sLogFileDirectory );
+  void     SetLogFileName ( const xbString &sLogFileName );
+  void     SetLogSize     ( size_t lSize );
+  xbInt16  WriteLogMessage( const xbString &sLogMessage, xbInt16 iOutputOpt = 0 );
+  xbInt16  WriteLogBytes  ( xbUInt32 lCnt, const char *p );
+
+  void     xbSleep        ( xbInt32 lMillisecs );
+
+
+  /* xbase functions */
+  #ifdef XB_FUNCTION_SUPPORT
+  xbInt16 ABS( xbDouble dIn, xbDouble &dOut );
+  xbInt16 ALLTRIM( const xbString &sIn, xbString &sOut );
+  xbInt16 ASC( const xbString &s, xbDouble &dAscOut );
+  xbInt16 AT( const xbString &sSrchFor, const xbString &sBase, xbDouble &dPos );
+  xbInt16 CDOW( xbDate &dInDate, xbString &sOutDow );
+  xbInt16 CHR( xbDouble dAsciCd, xbString &sOut );
+  xbInt16 CMONTH( xbDate &dInDate, xbString &sOutMonth );
+  xbInt16 CTOD( const xbString &sInDate, xbDate &dOutDate );
+  xbInt16 DATE( xbDate &dOutDate );
+  xbInt16 DAY( const xbDate &dInDate, xbDouble &dOutDay );
+  xbInt16 DEL( xbDbf * d, xbString &sOut, xbInt16 iRecBufSw = 0 );
+  xbInt16 DELETED( xbDbf * d, xbBool &bOut, xbInt16 iRecBufSw = 0 );
+  xbInt16 DESCEND( const xbString &sIn,  xbString &sOut );
+  xbInt16 DESCEND( const xbDate   &dInDate, xbDate &dOutDate );
+  xbInt16 DESCEND( const xbDouble dIn,   xbDouble &dsOut );
+  xbInt16 DOW( const xbDate &sInDate, xbDouble &dDowOut );
+  xbInt16 DTOC( xbDate &dInDate, xbString &sOutFmtDate );
+  xbInt16 DTOS( xbDate &dInDate, xbString &sOutFmtDate );
+  xbInt16 EXP( xbDouble dIn, xbDouble &dOut );
+  xbInt16 IIF( xbBool bResult, const xbString &sTrueResult, const xbString &sFalseResult, xbString &sResult );
+  xbInt16 INT( xbDouble dIn, xbDouble &dOut );
+  xbInt16 ISALPHA( const xbString &s, xbBool &bResult );
+  xbInt16 ISLOWER( const xbString &s, xbBool &bResult );
+  xbInt16 ISUPPER( const xbString &s, xbBool &bResult );
+  xbInt16 LEFT( const xbString &sIn, xbUInt32 lCharCnt, xbString &sOut );
+  xbInt16 LEN( const xbString &sIn, xbDouble &dLen );
+  xbInt16 LOG( xbDouble dIn, xbDouble &dOut );
+  xbInt16 LOWER( const xbString &sIn, xbString &sOut );
+  xbInt16 LTRIM( const xbString &sIn, xbString & sOut );
+  xbInt16 MAX( xbDouble dIn1, xbDouble dIn2, xbDouble &dOut );
+  xbInt16 MIN( xbDouble dIn1, xbDouble dIn2, xbDouble &dOut );
+  xbInt16 MONTH( xbDate &dInDate, xbDouble &dMonthOut );
+  xbInt16 RECCOUNT( xbDbf * d, xbDouble &dRecOut );
+  xbInt16 RECNO( xbDbf * d, xbDouble &dRecOut );
+  xbInt16 REPLICATE( const xbString &sIn, xbUInt32 ulRepCnt, xbString &sOut );
+  xbInt16 RIGHT( const xbString &sIn, xbUInt32 iCharCnt, xbString &sOut );
+  xbInt16 RTRIM( const xbString &sIn, xbString &sOut );
+  xbInt16 SPACE( xbInt32 lCnt, xbString &sOut );
+  xbInt16 SQRT( xbDouble dBase, xbDouble &dSqrRt );
+  xbInt16 STOD( const xbString &sIn, xbDate &sDateOut );
+  xbInt16 STR( xbDouble dIn, xbString &sOut );
+  xbInt16 STR( xbDouble dIn, xbUInt32 ulLen, xbString &sOut );
+  xbInt16 STR( xbDouble dIn, xbUInt32 ulLen, xbUInt32 ulDec, xbString &sOut );
+  xbInt16 STR( xbDouble dIn, xbUInt32 ulLen, xbUInt32 ulDec, xbString &sPadChar, xbString &sOut );
+  xbInt16 STRZERO( xbDouble dIn, xbUInt32 ulLen, xbUInt32 ulDec, xbString &sOut );
+  xbInt16 SUBSTR( const xbString &sIn, xbUInt32 ulStartPos, xbUInt32 ulLen, xbString &sOut );
+  xbInt16 TRIM( const xbString &sIn, xbString &sOut );
+  xbInt16 UPPER( const xbString &sIn, xbString &sOut );
+  xbInt16 VAL( const xbString &sIn, xbDouble &dOut );
+  xbInt16 YEAR( xbDate &dInDate, xbDouble &dOutYear );
+  #endif
+
+ protected:
+  friend class xbBcd;
+  friend class xbExp;
+
+  xbInt16 GetFunctionInfo( const xbString &sExpLine, char &cReturnType, xbInt16 &iReturnLenCalc, xbInt32 &lReturnLenVal ) const;
+  static xbInt16 xbMemcmp( const unsigned char *s1, const unsigned char *s2, size_t n );
+
+ private:
+
+#ifdef XB_LOGGING_SUPPORT
+ xbLog *xLog;
+#endif
+
+};
+
+}        /* namespace xb    */
+#endif   /* __XB_DBLIST_H__ */
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