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-/*
- * jmemmac.c
- *
- * Copyright (C) 1992-1997, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * jmemmac.c provides an Apple Macintosh implementation of the system-
- * dependent portion of the JPEG memory manager.
- *
- * If you use jmemmac.c, then you must define USE_MAC_MEMMGR in the
- * JPEG_INTERNALS part of jconfig.h.
- *
- * jmemmac.c uses the Macintosh toolbox routines NewPtr and DisposePtr
- * instead of malloc and free. It accurately determines the amount of
- * memory available by using CompactMem. Notice that if left to its
- * own devices, this code can chew up all available space in the
- * application's zone, with the exception of the rather small "slop"
- * factor computed in jpeg_mem_available(). The application can ensure
- * that more space is left over by reducing max_memory_to_use.
- *
- * Large images are swapped to disk using temporary files and System 7.0+'s
- * temporary folder functionality.
- *
- * Note that jmemmac.c depends on two features of MacOS that were first
- * introduced in System 7: FindFolder and the FSSpec-based calls.
- * If your application uses jmemmac.c and is run under System 6 or earlier,
- * and the jpeg library decides it needs a temporary file, it will abort,
- * printing error messages about requiring System 7. (If no temporary files
- * are created, it will run fine.)
- *
- * If you want to use jmemmac.c in an application that might be used with
- * System 6 or earlier, then you should remove dependencies on FindFolder
- * and the FSSpec calls. You will need to replace FindFolder with some
- * other mechanism for finding a place to put temporary files, and you
- * should replace the FSSpec calls with their HFS equivalents:
- *
- * FSpDelete -> HDelete
- * FSpGetFInfo -> HGetFInfo
- * FSpCreate -> HCreate
- * FSpOpenDF -> HOpen *** Note: not HOpenDF ***
- * FSMakeFSSpec -> (fill in spec by hand.)
- *
- * (Use HOpen instead of HOpenDF. HOpen is just a glue-interface to PBHOpen,
- * which is on all HFS macs. HOpenDF is a System 7 addition which avoids the
- * ages-old problem of names starting with a period.)
- *
- * Contributed by Sam Bushell (jsam@iagu.on.net) and
- * Dan Gildor (gyld@in-touch.com).
- */
-
-#define JPEG_INTERNALS
-#include "jinclude.h"
-#include "jpeglib.h"
-#include "jmemsys.h" /* import the system-dependent declarations */
-
-#ifndef USE_MAC_MEMMGR /* make sure user got configuration right */
- You forgot to define USE_MAC_MEMMGR in jconfig.h. /* deliberate syntax error */
-#endif
-
-#include <Memory.h> /* we use the MacOS memory manager */
-#include <Files.h> /* we use the MacOS File stuff */
-#include <Folders.h> /* we use the MacOS HFS stuff */
-#include <Script.h> /* for smSystemScript */
-#include <Gestalt.h> /* we use Gestalt to test for specific functionality */
-
-#ifndef TEMP_FILE_NAME /* can override from jconfig.h or Makefile */
-#define TEMP_FILE_NAME "JPG%03d.TMP"
-#endif
-
-static int next_file_num; /* to distinguish among several temp files */
-
-
-/*
- * Memory allocation and freeing are controlled by the MacOS library
- * routines NewPtr() and DisposePtr(), which allocate fixed-address
- * storage. Unfortunately, the IJG library isn't smart enough to cope
- * with relocatable storage.
- */
-
-GLOBAL(void *)
-jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
-{
- return (void *) NewPtr(sizeofobject);
-}
-
-GLOBAL(void)
-jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
-{
- DisposePtr((Ptr) object);
-}
-
-
-/*
- * "Large" objects are treated the same as "small" ones.
- * NB: we include FAR keywords in the routine declarations simply for
- * consistency with the rest of the IJG code; FAR should expand to empty
- * on rational architectures like the Mac.
- */
-
-GLOBAL(void FAR *)
-jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
-{
- return (void FAR *) NewPtr(sizeofobject);
-}
-
-GLOBAL(void)
-jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
-{
- DisposePtr((Ptr) object);
-}
-
-
-/*
- * This routine computes the total memory space available for allocation.
- */
-
-GLOBAL(long)
-jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
- long max_bytes_needed, long already_allocated)
-{
- long limit = cinfo->mem->max_memory_to_use - already_allocated;
- long slop, mem;
-
- /* Don't ask for more than what application has told us we may use */
- if (max_bytes_needed > limit && limit > 0)
- max_bytes_needed = limit;
- /* Find whether there's a big enough free block in the heap.
- * CompactMem tries to create a contiguous block of the requested size,
- * and then returns the size of the largest free block (which could be
- * much more or much less than we asked for).
- * We add some slop to ensure we don't use up all available memory.
- */
- slop = max_bytes_needed / 16 + 32768L;
- mem = CompactMem(max_bytes_needed + slop) - slop;
- if (mem < 0)
- mem = 0; /* sigh, couldn't even get the slop */
- /* Don't take more than the application says we can have */
- if (mem > limit && limit > 0)
- mem = limit;
- return mem;
-}
-
-
-/*
- * Backing store (temporary file) management.
- * Backing store objects are only used when the value returned by
- * jpeg_mem_available is less than the total space needed. You can dispense
- * with these routines if you have plenty of virtual memory; see jmemnobs.c.
- */
-
-
-METHODDEF(void)
-read_backing_store (j_common_ptr cinfo, backing_store_ptr info,
- void FAR * buffer_address,
- long file_offset, long byte_count)
-{
- long bytes = byte_count;
- long retVal;
-
- if ( SetFPos ( info->temp_file, fsFromStart, file_offset ) != noErr )
- ERREXIT(cinfo, JERR_TFILE_SEEK);
-
- retVal = FSRead ( info->temp_file, &bytes,
- (unsigned char *) buffer_address );
- if ( retVal != noErr || bytes != byte_count )
- ERREXIT(cinfo, JERR_TFILE_READ);
-}
-
-
-METHODDEF(void)
-write_backing_store (j_common_ptr cinfo, backing_store_ptr info,
- void FAR * buffer_address,
- long file_offset, long byte_count)
-{
- long bytes = byte_count;
- long retVal;
-
- if ( SetFPos ( info->temp_file, fsFromStart, file_offset ) != noErr )
- ERREXIT(cinfo, JERR_TFILE_SEEK);
-
- retVal = FSWrite ( info->temp_file, &bytes,
- (unsigned char *) buffer_address );
- if ( retVal != noErr || bytes != byte_count )
- ERREXIT(cinfo, JERR_TFILE_WRITE);
-}
-
-
-METHODDEF(void)
-close_backing_store (j_common_ptr cinfo, backing_store_ptr info)
-{
- FSClose ( info->temp_file );
- FSpDelete ( &(info->tempSpec) );
-}
-
-
-/*
- * Initial opening of a backing-store object.
- *
- * This version uses FindFolder to find the Temporary Items folder,
- * and puts the temporary file in there.
- */
-
-GLOBAL(void)
-jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
- long total_bytes_needed)
-{
- short tmpRef, vRefNum;
- long dirID;
- FInfo finderInfo;
- FSSpec theSpec;
- Str255 fName;
- OSErr osErr;
- long gestaltResponse = 0;
-
- /* Check that FSSpec calls are available. */
- osErr = Gestalt( gestaltFSAttr, &gestaltResponse );
- if ( ( osErr != noErr )
- || !( gestaltResponse & (1<<gestaltHasFSSpecCalls) ) )
- ERREXITS(cinfo, JERR_TFILE_CREATE, "- System 7.0 or later required");
- /* TO DO: add a proper error message to jerror.h. */
-
- /* Check that FindFolder is available. */
- osErr = Gestalt( gestaltFindFolderAttr, &gestaltResponse );
- if ( ( osErr != noErr )
- || !( gestaltResponse & (1<<gestaltFindFolderPresent) ) )
- ERREXITS(cinfo, JERR_TFILE_CREATE, "- System 7.0 or later required.");
- /* TO DO: add a proper error message to jerror.h. */
-
- osErr = FindFolder ( kOnSystemDisk, kTemporaryFolderType, kCreateFolder,
- &vRefNum, &dirID );
- if ( osErr != noErr )
- ERREXITS(cinfo, JERR_TFILE_CREATE, "- temporary items folder unavailable");
- /* TO DO: Try putting the temp files somewhere else. */
-
- /* Keep generating file names till we find one that's not in use */
- for (;;) {
- next_file_num++; /* advance counter */
-
- sprintf(info->temp_name, TEMP_FILE_NAME, next_file_num);
- strcpy ( (Ptr)fName+1, info->temp_name );
- *fName = strlen (info->temp_name);
- osErr = FSMakeFSSpec ( vRefNum, dirID, fName, &theSpec );
-
- if ( (osErr = FSpGetFInfo ( &theSpec, &finderInfo ) ) != noErr )
- break;
- }
-
- osErr = FSpCreate ( &theSpec, '????', '????', smSystemScript );
- if ( osErr != noErr )
- ERREXITS(cinfo, JERR_TFILE_CREATE, info->temp_name);
-
- osErr = FSpOpenDF ( &theSpec, fsRdWrPerm, &(info->temp_file) );
- if ( osErr != noErr )
- ERREXITS(cinfo, JERR_TFILE_CREATE, info->temp_name);
-
- info->tempSpec = theSpec;
-
- info->read_backing_store = read_backing_store;
- info->write_backing_store = write_backing_store;
- info->close_backing_store = close_backing_store;
- TRACEMSS(cinfo, 1, JTRC_TFILE_OPEN, info->temp_name);
-}
-
-
-/*
- * These routines take care of any system-dependent initialization and
- * cleanup required.
- */
-
-GLOBAL(long)
-jpeg_mem_init (j_common_ptr cinfo)
-{
- next_file_num = 0;
-
- /* max_memory_to_use will be initialized to FreeMem()'s result;
- * the calling application might later reduce it, for example
- * to leave room to invoke multiple JPEG objects.
- * Note that FreeMem returns the total number of free bytes;
- * it may not be possible to allocate a single block of this size.
- */
- return FreeMem();
-}
-
-GLOBAL(void)
-jpeg_mem_term (j_common_ptr cinfo)
-{
- /* no work */
-}
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