New upstream version 4.1.0upstream/4.1.0

1 files changed, 70 insertions, 0 deletions

diff --git a/src/include/xbblkread.h b/src/include/xbblkread.h
new file mode 100755
index 0000000..353c618
--- /dev/null
+++ b/src/include/xbblkread.h
@@ -0,0 +1,70 @@
+/*  xbblkread.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_BLKREAD_H__
+#define __XB_BLKREAD_H__
+
+namespace xb{
+#ifdef XB_BLOCKREAD_SUPPORT
+
+
+
+//! @brief xbBlockRead class.
+/*!
+The xbBlockRead class can be used to read blocks of records at one time
+rather than one record at a time for perfomance improvements when reading a DBF file sequentially.<br>
+
+*/
+
+
+class XBDLLEXPORT xbBlockRead {
+
+  public:
+    xbBlockRead( xbDbf * d );
+    ~xbBlockRead();
+
+    #ifdef XB_DEBUG_SUPPORT
+    void     DumpReadBlockInternals();
+    #endif
+
+    xbInt16  Init( xbUInt32 ulBlkSize = 0 );
+
+    xbUInt32 GetBlockFirstRecNo() const;
+    xbUInt32 GetBlockRecCnt() const;
+    xbUInt32 GetBlockSize() const;
+
+    xbInt16  GetRecord( xbUInt32 ulRecNo );            // retrieve a data record from a block to RecBuf
+    xbInt16  SetBlockSize( xbUInt32 ulBlkSize );
+
+
+  private:
+
+    xbInt16  GetBlockForRecNo( xbUInt32 ulRecNo );    // retrieve block from disk for a given record number
+
+    char     *pBlock;             // block pointer
+    xbUInt32 ulBlkSize;           // block size in bytes
+    xbUInt32 ulFirstBlkRec;       // first recod number in the block
+    xbUInt32 ulRecCnt;            // number of records in block
+    xbUInt32 ulMaxRecs;           // max number of records block can handle
+    xbBool   bEof;                // EOF flag
+    xbDbf    *dbf;                // reference to associated dbf file
+//    xbXBase  *xbase;              // reference to main xbXBase structure
+    time_t   tFmTime;             // file modify time at time of block read
+
+};
+
+#endif // XB_BLOCKREAD
+}  /* namespace */
+#endif  /*  __XB_BLOCKREAD_H__  */