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Diffstat (limited to 'src/3rdparty/libjpeg/jmemmac.c')
| -rw-r--r-- | src/3rdparty/libjpeg/jmemmac.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/src/3rdparty/libjpeg/jmemmac.c b/src/3rdparty/libjpeg/jmemmac.c new file mode 100644 index 0000000..106f9be --- /dev/null +++ b/src/3rdparty/libjpeg/jmemmac.c @@ -0,0 +1,289 @@ +/* + * 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 */ +} |