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
29 /*
30 * Memory allocation and freeing are controlled by the regular library
31 * routines malloc() and free().
32 */
33
34 GLOBAL(void *)
jpeg_get_small(j_common_ptr cinfo,size_t sizeofobject)35 jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
36 {
37 cinfo = 0;
38 return (void *) malloc(sizeofobject);
39 }
40
41 GLOBAL(void)
jpeg_free_small(j_common_ptr cinfo,void * object,size_t sizeofobject)42 jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
43 {
44 cinfo = 0;
45 sizeofobject = 0;
46 free(object);
47 }
48
49
50 /*
51 * "Large" objects are treated the same as "small" ones.
52 * NB: although we include FAR keywords in the routine declarations,
53 * this file won't actually work in 80x86 small/medium model; at least,
54 * you probably won't be able to process useful-size images in only 64KB.
55 */
56
57 GLOBAL(void FAR *)
jpeg_get_large(j_common_ptr cinfo,size_t sizeofobject)58 jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
59 {
60 cinfo = 0;
61 return (void FAR *) malloc(sizeofobject);
62 }
63
64 GLOBAL(void)
jpeg_free_large(j_common_ptr cinfo,void FAR * object,size_t sizeofobject)65 jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
66 {
67 cinfo = 0;
68 sizeofobject = 0;
69 free(object);
70 }
71
72
73 /*
74 * This routine computes the total memory space available for allocation.
75 * Here we always say, "we got all you want bud!"
76 */
77
78 GLOBAL(long)
jpeg_mem_available(j_common_ptr cinfo,long min_bytes_needed,long max_bytes_needed,long already_allocated)79 jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
80 long max_bytes_needed, long already_allocated)
81 {
82 cinfo = 0;
83 min_bytes_needed = 0;
84 already_allocated = 0;
85 return max_bytes_needed;
86 }
87
88
89 /*
90 * Backing store (temporary file) management.
91 * Since jpeg_mem_available always promised the moon,
92 * this should never be called and we can just error out.
93 */
94
95 GLOBAL(void)
jpeg_open_backing_store(j_common_ptr cinfo,backing_store_ptr info,long total_bytes_needed)96 jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
97 long total_bytes_needed)
98 {
99 info = 0;
100 total_bytes_needed = 0;
101 ERREXIT(cinfo, JERR_NO_BACKING_STORE);
102 }
103
104
105 /*
106 * These routines take care of any system-dependent initialization and
107 * cleanup required. Here, there isn't any.
108 */
109
110 GLOBAL(long)
jpeg_mem_init(j_common_ptr cinfo)111 jpeg_mem_init (j_common_ptr cinfo)
112 {
113 cinfo = 0;
114 return 0; /* just set max_memory_to_use to 0 */
115 }
116
117 GLOBAL(void)
jpeg_mem_term(j_common_ptr cinfo)118 jpeg_mem_term (j_common_ptr cinfo)
119 {
120 cinfo = 0;
121 /* no work */
122 }
123