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