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() */
26extern void * malloc (size_t size);
27extern 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
36GLOBAL(void *)
37jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
38{
39  return (void *) malloc(sizeofobject);
40}
41
42GLOBAL(void)
43jpeg_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
53GLOBAL(void *)
54jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
55{
56  return (void *) malloc(sizeofobject);
57}
58
59GLOBAL(void)
60jpeg_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
71GLOBAL(size_t)
72jpeg_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
85GLOBAL(void)
86jpeg_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
98GLOBAL(long)
99jpeg_mem_init (j_common_ptr cinfo)
100{
101  return 0;                     /* just set max_memory_to_use to 0 */
102}
103
104GLOBAL(void)
105jpeg_mem_term (j_common_ptr cinfo)
106{
107  /* no work */
108}
109