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 *)
jpeg_get_small(j_common_ptr cinfo,size_t sizeofobject)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)
jpeg_free_small(j_common_ptr cinfo,void * object,size_t sizeofobject)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 *)
jpeg_get_large(j_common_ptr cinfo,size_t sizeofobject)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)
jpeg_free_large(j_common_ptr cinfo,void FAR * object,size_t sizeofobject)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)
jpeg_mem_available(j_common_ptr cinfo,long min_bytes_needed,long max_bytes_needed,long already_allocated)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)
jpeg_open_backing_store(j_common_ptr cinfo,backing_store_ptr info,long total_bytes_needed)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)
jpeg_mem_init(j_common_ptr cinfo)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)
jpeg_mem_term(j_common_ptr cinfo)120 jpeg_mem_term (j_common_ptr cinfo)
121 {
122 /* no work */
123 }
124