1 /* 2 * jmemnobs.c 3 * 4 * Copyright (C) 1992-1996, Thomas G. Lane. 5 * This file is part of the Independent JPEG Group's software. 6 * For conditions of distribution and use, see the accompanying README file. 7 * 8 * This file provides a really simple implementation of the system- 9 * dependent portion of the JPEG memory manager. This implementation 10 * assumes that no backing-store files are needed: all required space 11 * can be obtained from malloc(). 12 * This is very portable in the sense that it'll compile on almost anything, 13 * but you'd better have lots of main memory (or virtual memory) if you want 14 * to process big images. 15 * Note that the max_memory_to_use option is ignored by this implementation. 16 */ 17 18 #define JPEG_INTERNALS 19 #include "jinclude.h" 20 #include "jpeglib.h" 21 #include "jmemsys.h" /* import the system-dependent declarations */ 22 23 #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */ 24 extern void * malloc JPP((size_t size)); 25 extern void free JPP((void *ptr)); 26 #endif 27 28 #if defined(_FX_MANAGED_CODE_) && defined(__cplusplus) 29 extern "C" { 30 #endif 31 32 void* FXMEM_DefaultAlloc(int byte_size, int); 33 void FXMEM_DefaultFree(void* pointer, int); 34 35 #if defined(_FX_MANAGED_CODE_) && defined(__cplusplus) 36 } 37 #endif 38 39 /* 40 * Memory allocation and freeing are controlled by the regular library 41 * routines malloc() and free(). 42 */ 43 44 GLOBAL(void *) 45 jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject) 46 { 47 // return (void *) malloc(sizeofobject); 48 return FXMEM_DefaultAlloc(sizeofobject, 0); 49 } 50 51 GLOBAL(void) 52 jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject) 53 { 54 // free(object); 55 FXMEM_DefaultFree(object, 0); 56 } 57 58 59 /* 60 * "Large" objects are treated the same as "small" ones. 61 * NB: although we include FAR keywords in the routine declarations, 62 * this file won't actually work in 80x86 small/medium model; at least, 63 * you probably won't be able to process useful-size images in only 64KB. 64 */ 65 66 GLOBAL(void FAR *) 67 jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject) 68 { 69 // return (void FAR *) malloc(sizeofobject); 70 return FXMEM_DefaultAlloc(sizeofobject, 0); 71 } 72 73 GLOBAL(void) 74 jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject) 75 { 76 // free(object); 77 FXMEM_DefaultFree(object, 0); 78 } 79 80 81 /* 82 * This routine computes the total memory space available for allocation. 83 * Here we always say, "we got all you want bud!" 84 */ 85 86 GLOBAL(long) 87 jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed, 88 long max_bytes_needed, long already_allocated) 89 { 90 return max_bytes_needed; 91 } 92 93 94 /* 95 * Backing store (temporary file) management. 96 * Since jpeg_mem_available always promised the moon, 97 * this should never be called and we can just error out. 98 */ 99 100 GLOBAL(void) 101 jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info, 102 long total_bytes_needed) 103 { 104 ERREXIT(cinfo, JERR_NO_BACKING_STORE); 105 } 106 107 108 /* 109 * These routines take care of any system-dependent initialization and 110 * cleanup required. Here, there isn't any. 111 */ 112 113 GLOBAL(long) 114 jpeg_mem_init (j_common_ptr cinfo) 115 { 116 return 0; /* just set max_memory_to_use to 0 */ 117 } 118 119 GLOBAL(void) 120 jpeg_mem_term (j_common_ptr cinfo) 121 { 122 /* no work */ 123 } 124