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Thomas G. Lane4a6b7301992-03-17 00:00:00 +00001/*
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +00002 * jmemnobs.c
Thomas G. Lane4a6b7301992-03-17 00:00:00 +00003 *
Thomas G. Lane489583f1996-02-07 00:00:00 +00004 * Copyright (C) 1992-1996, Thomas G. Lane.
Thomas G. Lane4a6b7301992-03-17 00:00:00 +00005 * 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
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000018#define JPEG_INTERNALS
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000019#include "jinclude.h"
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000020#include "jpeglib.h"
21#include "jmemsys.h" /* import the system-dependent declarations */
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000022
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000023#ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */
24extern void * malloc JPP((size_t size));
25extern void free JPP((void *ptr));
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000026#endif
27
28
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000029/*
30 * Memory allocation and freeing are controlled by the regular library
31 * routines malloc() and free().
32 */
33
Thomas G. Lane489583f1996-02-07 00:00:00 +000034GLOBAL(void *)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000035jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000036{
37 return (void *) malloc(sizeofobject);
38}
39
Thomas G. Lane489583f1996-02-07 00:00:00 +000040GLOBAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000041jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000042{
43 free(object);
44}
45
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000046
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000047/*
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000048 * "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.
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000052 */
53
Thomas G. Lane489583f1996-02-07 00:00:00 +000054GLOBAL(void FAR *)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000055jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
56{
57 return (void FAR *) malloc(sizeofobject);
58}
59
Thomas G. Lane489583f1996-02-07 00:00:00 +000060GLOBAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000061jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
62{
63 free(object);
64}
65
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000066
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
DRC04899092010-02-26 23:01:19 +000072GLOBAL(size_t)
73jpeg_mem_available (j_common_ptr cinfo, size_t min_bytes_needed,
74 size_t max_bytes_needed, size_t already_allocated)
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000075{
76 return max_bytes_needed;
77}
78
79
80/*
81 * Backing store (temporary file) management.
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000082 * Since jpeg_mem_available always promised the moon,
83 * this should never be called and we can just error out.
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000084 */
85
Thomas G. Lane489583f1996-02-07 00:00:00 +000086GLOBAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000087jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
88 long total_bytes_needed)
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000089{
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000090 ERREXIT(cinfo, JERR_NO_BACKING_STORE);
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000091}
92
93
94/*
95 * These routines take care of any system-dependent initialization and
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000096 * cleanup required. Here, there isn't any.
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000097 */
98
Thomas G. Lane489583f1996-02-07 00:00:00 +000099GLOBAL(long)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000100jpeg_mem_init (j_common_ptr cinfo)
Thomas G. Lane4a6b7301992-03-17 00:00:00 +0000101{
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000102 return 0; /* just set max_memory_to_use to 0 */
Thomas G. Lane4a6b7301992-03-17 00:00:00 +0000103}
104
Thomas G. Lane489583f1996-02-07 00:00:00 +0000105GLOBAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000106jpeg_mem_term (j_common_ptr cinfo)
Thomas G. Lane4a6b7301992-03-17 00:00:00 +0000107{
108 /* no work */
109}