170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jmemmac.c 370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Copyright (C) 1992-1997, Thomas G. Lane. 570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file is part of the Independent JPEG Group's software. 670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * For conditions of distribution and use, see the accompanying README file. 770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jmemmac.c provides an Apple Macintosh implementation of the system- 970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * dependent portion of the JPEG memory manager. 1070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 1170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * If you use jmemmac.c, then you must define USE_MAC_MEMMGR in the 1270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * JPEG_INTERNALS part of jconfig.h. 1370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 1470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jmemmac.c uses the Macintosh toolbox routines NewPtr and DisposePtr 1570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * instead of malloc and free. It accurately determines the amount of 1670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * memory available by using CompactMem. Notice that if left to its 1770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * own devices, this code can chew up all available space in the 1870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * application's zone, with the exception of the rather small "slop" 1970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * factor computed in jpeg_mem_available(). The application can ensure 2070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * that more space is left over by reducing max_memory_to_use. 2170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 2270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Large images are swapped to disk using temporary files and System 7.0+'s 2370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * temporary folder functionality. 2470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 2570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Note that jmemmac.c depends on two features of MacOS that were first 2670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * introduced in System 7: FindFolder and the FSSpec-based calls. 2770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * If your application uses jmemmac.c and is run under System 6 or earlier, 2870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * and the jpeg library decides it needs a temporary file, it will abort, 2970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * printing error messages about requiring System 7. (If no temporary files 3070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * are created, it will run fine.) 3170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 3270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * If you want to use jmemmac.c in an application that might be used with 3370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * System 6 or earlier, then you should remove dependencies on FindFolder 3470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * and the FSSpec calls. You will need to replace FindFolder with some 3570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * other mechanism for finding a place to put temporary files, and you 3670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * should replace the FSSpec calls with their HFS equivalents: 3770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 3870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * FSpDelete -> HDelete 3970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * FSpGetFInfo -> HGetFInfo 4070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * FSpCreate -> HCreate 4170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * FSpOpenDF -> HOpen *** Note: not HOpenDF *** 4270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * FSMakeFSSpec -> (fill in spec by hand.) 4370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 4470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * (Use HOpen instead of HOpenDF. HOpen is just a glue-interface to PBHOpen, 4570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * which is on all HFS macs. HOpenDF is a System 7 addition which avoids the 4670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * ages-old problem of names starting with a period.) 4770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 4870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Contributed by Sam Bushell (jsam@iagu.on.net) and 4970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Dan Gildor (gyld@in-touch.com). 5070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 5170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 5270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define JPEG_INTERNALS 5370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jinclude.h" 5470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jpeglib.h" 5570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jmemsys.h" /* import the system-dependent declarations */ 5670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 5770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#ifndef USE_MAC_MEMMGR /* make sure user got configuration right */ 5870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine You forgot to define USE_MAC_MEMMGR in jconfig.h. /* deliberate syntax error */ 5970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif 6070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 6170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include <Memory.h> /* we use the MacOS memory manager */ 6270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include <Files.h> /* we use the MacOS File stuff */ 6370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include <Folders.h> /* we use the MacOS HFS stuff */ 6470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include <Script.h> /* for smSystemScript */ 6570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include <Gestalt.h> /* we use Gestalt to test for specific functionality */ 6670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 6770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#ifndef TEMP_FILE_NAME /* can override from jconfig.h or Makefile */ 6870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define TEMP_FILE_NAME "JPG%03d.TMP" 6970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif 7070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 7170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinestatic int next_file_num; /* to distinguish among several temp files */ 7270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 7370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 7470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 7570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Memory allocation and freeing are controlled by the MacOS library 7670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * routines NewPtr() and DisposePtr(), which allocate fixed-address 7770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * storage. Unfortunately, the IJG library isn't smart enough to cope 7870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * with relocatable storage. 7970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 8070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 8170a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void *) 8270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_get_small (j_common_ptr cinfo, size_t sizeofobject) 8370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 8470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return (void *) NewPtr(sizeofobject); 8570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 8670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 8770a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void) 8870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject) 8970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 9070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine DisposePtr((Ptr) object); 9170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 9270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 9370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 9470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 9570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * "Large" objects are treated the same as "small" ones. 9670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * NB: we include FAR keywords in the routine declarations simply for 9770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * consistency with the rest of the IJG code; FAR should expand to empty 9870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * on rational architectures like the Mac. 9970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 10070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 10170a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void FAR *) 10270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_get_large (j_common_ptr cinfo, size_t sizeofobject) 10370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 10470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return (void FAR *) NewPtr(sizeofobject); 10570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 10670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 10770a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void) 10870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject) 10970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 11070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine DisposePtr((Ptr) object); 11170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 11270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 11370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 11470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 11570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This routine computes the total memory space available for allocation. 11670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 11770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 11870a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(long) 11970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed, 12070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long max_bytes_needed, long already_allocated) 12170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 12270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long limit = cinfo->mem->max_memory_to_use - already_allocated; 12370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long slop, mem; 12470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 12570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Don't ask for more than what application has told us we may use */ 12670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (max_bytes_needed > limit && limit > 0) 12770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine max_bytes_needed = limit; 12870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Find whether there's a big enough free block in the heap. 12970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * CompactMem tries to create a contiguous block of the requested size, 13070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * and then returns the size of the largest free block (which could be 13170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * much more or much less than we asked for). 13270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * We add some slop to ensure we don't use up all available memory. 13370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 13470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine slop = max_bytes_needed / 16 + 32768L; 13570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine mem = CompactMem(max_bytes_needed + slop) - slop; 13670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (mem < 0) 13770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine mem = 0; /* sigh, couldn't even get the slop */ 13870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Don't take more than the application says we can have */ 13970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (mem > limit && limit > 0) 14070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine mem = limit; 14170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return mem; 14270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 14370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 14470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 14570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 14670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Backing store (temporary file) management. 14770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Backing store objects are only used when the value returned by 14870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jpeg_mem_available is less than the total space needed. You can dispense 14970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * with these routines if you have plenty of virtual memory; see jmemnobs.c. 15070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 15170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 15270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 15370a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(void) 15470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineread_backing_store (j_common_ptr cinfo, backing_store_ptr info, 15570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine void FAR * buffer_address, 15670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long file_offset, long byte_count) 15770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 15870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long bytes = byte_count; 15970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long retVal; 16070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 16170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ( SetFPos ( info->temp_file, fsFromStart, file_offset ) != noErr ) 16270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_TFILE_SEEK); 16370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 16470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine retVal = FSRead ( info->temp_file, &bytes, 16570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (unsigned char *) buffer_address ); 16670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ( retVal != noErr || bytes != byte_count ) 16770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_TFILE_READ); 16870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 16970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 17070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 17170a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(void) 17270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinewrite_backing_store (j_common_ptr cinfo, backing_store_ptr info, 17370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine void FAR * buffer_address, 17470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long file_offset, long byte_count) 17570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 17670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long bytes = byte_count; 17770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long retVal; 17870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 17970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ( SetFPos ( info->temp_file, fsFromStart, file_offset ) != noErr ) 18070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_TFILE_SEEK); 18170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 18270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine retVal = FSWrite ( info->temp_file, &bytes, 18370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (unsigned char *) buffer_address ); 18470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ( retVal != noErr || bytes != byte_count ) 18570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_TFILE_WRITE); 18670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 18770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 18870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 18970a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(void) 19070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineclose_backing_store (j_common_ptr cinfo, backing_store_ptr info) 19170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 19270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine FSClose ( info->temp_file ); 19370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine FSpDelete ( &(info->tempSpec) ); 19470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 19570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 19670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 19770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 19870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Initial opening of a backing-store object. 19970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 20070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This version uses FindFolder to find the Temporary Items folder, 20170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * and puts the temporary file in there. 20270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 20370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 20470a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void) 20570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info, 20670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long total_bytes_needed) 20770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 20870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine short tmpRef, vRefNum; 20970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long dirID; 21070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine FInfo finderInfo; 21170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine FSSpec theSpec; 21270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine Str255 fName; 21370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine OSErr osErr; 21470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long gestaltResponse = 0; 21570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Check that FSSpec calls are available. */ 21770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine osErr = Gestalt( gestaltFSAttr, &gestaltResponse ); 21870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ( ( osErr != noErr ) 21970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine || !( gestaltResponse & (1<<gestaltHasFSSpecCalls) ) ) 22070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXITS(cinfo, JERR_TFILE_CREATE, "- System 7.0 or later required"); 22170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* TO DO: add a proper error message to jerror.h. */ 22270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 22370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Check that FindFolder is available. */ 22470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine osErr = Gestalt( gestaltFindFolderAttr, &gestaltResponse ); 22570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ( ( osErr != noErr ) 22670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine || !( gestaltResponse & (1<<gestaltFindFolderPresent) ) ) 22770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXITS(cinfo, JERR_TFILE_CREATE, "- System 7.0 or later required."); 22870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* TO DO: add a proper error message to jerror.h. */ 22970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 23070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine osErr = FindFolder ( kOnSystemDisk, kTemporaryFolderType, kCreateFolder, 23170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine &vRefNum, &dirID ); 23270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ( osErr != noErr ) 23370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXITS(cinfo, JERR_TFILE_CREATE, "- temporary items folder unavailable"); 23470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* TO DO: Try putting the temp files somewhere else. */ 23570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 23670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Keep generating file names till we find one that's not in use */ 23770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (;;) { 23870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine next_file_num++; /* advance counter */ 23970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine sprintf(info->temp_name, TEMP_FILE_NAME, next_file_num); 24170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine strcpy ( (Ptr)fName+1, info->temp_name ); 24270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine *fName = strlen (info->temp_name); 24370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine osErr = FSMakeFSSpec ( vRefNum, dirID, fName, &theSpec ); 24470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ( (osErr = FSpGetFInfo ( &theSpec, &finderInfo ) ) != noErr ) 24670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine break; 24770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 24870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine osErr = FSpCreate ( &theSpec, '????', '????', smSystemScript ); 25070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ( osErr != noErr ) 25170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXITS(cinfo, JERR_TFILE_CREATE, info->temp_name); 25270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 25370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine osErr = FSpOpenDF ( &theSpec, fsRdWrPerm, &(info->temp_file) ); 25470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ( osErr != noErr ) 25570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXITS(cinfo, JERR_TFILE_CREATE, info->temp_name); 25670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 25770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine info->tempSpec = theSpec; 25870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 25970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine info->read_backing_store = read_backing_store; 26070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine info->write_backing_store = write_backing_store; 26170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine info->close_backing_store = close_backing_store; 26270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine TRACEMSS(cinfo, 1, JTRC_TFILE_OPEN, info->temp_name); 26370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 26470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 26570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 26670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 26770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * These routines take care of any system-dependent initialization and 26870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * cleanup required. 26970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 27070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 27170a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(long) 27270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_mem_init (j_common_ptr cinfo) 27370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 27470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine next_file_num = 0; 27570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 27670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* max_memory_to_use will be initialized to FreeMem()'s result; 27770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * the calling application might later reduce it, for example 27870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * to leave room to invoke multiple JPEG objects. 27970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Note that FreeMem returns the total number of free bytes; 28070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * it may not be possible to allocate a single block of this size. 28170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 28270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return FreeMem(); 28370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 28470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 28570a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void) 28670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_mem_term (j_common_ptr cinfo) 28770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 28870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* no work */ 28970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 290