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.ijg
9 * file.
10 *
11 * This file provides a really simple implementation of the system-
12 * dependent portion of the JPEG memory manager. This implementation
13 * assumes that no backing-store files are needed: all required space
14 * can be obtained from malloc().
15 * This is very portable in the sense that it'll compile on almost anything,
16 * but you'd better have lots of main memory (or virtual memory) if you want
17 * to process big images.
18 * Note that the max_memory_to_use option is ignored by this implementation.
19 */
20
21#define JPEG_INTERNALS
22#include "jinclude.h"
23#include "jpeglib.h"
24#include "jmemsys.h" /* import the system-dependent declarations */
25
26#ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */
27extern void *malloc (size_t size);
28extern void free (void *ptr);
29#endif
30
31
32/*
33 * Memory allocation and freeing are controlled by the regular library
34 * routines malloc() and free().
35 */
36
37GLOBAL(void *)
38jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
39{
40 return (void *) malloc(sizeofobject);
41}
42
43GLOBAL(void)
44jpeg_free_small (j_common_ptr cinfo, void *object, size_t sizeofobject)
45{
46 free(object);
47}
48
49
50/*
51 * "Large" objects are treated the same as "small" ones.
52 */
53
54GLOBAL(void *)
55jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
56{
57 return (void *) malloc(sizeofobject);
58}
59
60GLOBAL(void)
61jpeg_free_large (j_common_ptr cinfo, void *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
72GLOBAL(size_t)
73jpeg_mem_available (j_common_ptr cinfo, size_t min_bytes_needed,
74 size_t max_bytes_needed, size_t 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
86GLOBAL(void)
87jpeg_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
99GLOBAL(long)
100jpeg_mem_init (j_common_ptr cinfo)
101{
102 return 0; /* just set max_memory_to_use to 0 */
103}
104
105GLOBAL(void)
106jpeg_mem_term (j_common_ptr cinfo)
107{
108 /* no work */
109}
110