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