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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 *
DRC5033f3e2014-05-18 18:33:44 +00004 * This file was part of the Independent JPEG Group's software:
Thomas G. Lane489583f1996-02-07 00:00:00 +00005 * Copyright (C) 1992-1996, Thomas G. Lane.
DRCda2a27e2017-03-18 16:15:14 -05006 * libjpeg-turbo Modifications:
DRC4a275cf2018-03-31 21:48:20 -05007 * Copyright (C) 2017-2018, D. R. Commander.
DRC7e3acc02015-10-10 10:25:46 -05008 * For conditions of distribution and use, see the accompanying README.ijg
9 * file.
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000010 *
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.
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000018 */
19
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000020#define JPEG_INTERNALS
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000021#include "jinclude.h"
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000022#include "jpeglib.h"
DRCe5eaf372014-05-09 18:00:32 +000023#include "jmemsys.h" /* import the system-dependent declarations */
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000024
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000025
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000026/*
27 * Memory allocation and freeing are controlled by the regular library
28 * routines malloc() and free().
29 */
30
Thomas G. Lane489583f1996-02-07 00:00:00 +000031GLOBAL(void *)
DRC19c791c2018-03-08 10:55:20 -060032jpeg_get_small(j_common_ptr cinfo, size_t sizeofobject)
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000033{
DRC19c791c2018-03-08 10:55:20 -060034 return (void *)malloc(sizeofobject);
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000035}
36
Thomas G. Lane489583f1996-02-07 00:00:00 +000037GLOBAL(void)
DRC19c791c2018-03-08 10:55:20 -060038jpeg_free_small(j_common_ptr cinfo, void *object, size_t sizeofobject)
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000039{
40 free(object);
41}
42
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000043
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000044/*
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000045 * "Large" objects are treated the same as "small" ones.
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000046 */
47
DRC5033f3e2014-05-18 18:33:44 +000048GLOBAL(void *)
DRC19c791c2018-03-08 10:55:20 -060049jpeg_get_large(j_common_ptr cinfo, size_t sizeofobject)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000050{
DRC19c791c2018-03-08 10:55:20 -060051 return (void *)malloc(sizeofobject);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000052}
53
Thomas G. Lane489583f1996-02-07 00:00:00 +000054GLOBAL(void)
DRC19c791c2018-03-08 10:55:20 -060055jpeg_free_large(j_common_ptr cinfo, void *object, size_t sizeofobject)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000056{
57 free(object);
58}
59
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000060
61/*
62 * This routine computes the total memory space available for allocation.
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000063 */
64
DRC04899092010-02-26 23:01:19 +000065GLOBAL(size_t)
DRC19c791c2018-03-08 10:55:20 -060066jpeg_mem_available(j_common_ptr cinfo, size_t min_bytes_needed,
67 size_t max_bytes_needed, size_t already_allocated)
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000068{
DRCda2a27e2017-03-18 16:15:14 -050069 if (cinfo->mem->max_memory_to_use) {
DRC4a275cf2018-03-31 21:48:20 -050070 if ((size_t)cinfo->mem->max_memory_to_use > already_allocated)
DRCda2a27e2017-03-18 16:15:14 -050071 return cinfo->mem->max_memory_to_use - already_allocated;
72 else
73 return 0;
74 } else {
75 /* Here we always say, "we got all you want bud!" */
76 return max_bytes_needed;
77 }
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000078}
79
80
81/*
82 * Backing store (temporary file) management.
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000083 * Since jpeg_mem_available always promised the moon,
84 * this should never be called and we can just error out.
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000085 */
86
Thomas G. Lane489583f1996-02-07 00:00:00 +000087GLOBAL(void)
DRC19c791c2018-03-08 10:55:20 -060088jpeg_open_backing_store(j_common_ptr cinfo, backing_store_ptr info,
89 long total_bytes_needed)
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000090{
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000091 ERREXIT(cinfo, JERR_NO_BACKING_STORE);
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000092}
93
94
95/*
96 * These routines take care of any system-dependent initialization and
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000097 * cleanup required. Here, there isn't any.
Thomas G. Lane4a6b7301992-03-17 00:00:00 +000098 */
99
Thomas G. Lane489583f1996-02-07 00:00:00 +0000100GLOBAL(long)
DRC19c791c2018-03-08 10:55:20 -0600101jpeg_mem_init(j_common_ptr cinfo)
Thomas G. Lane4a6b7301992-03-17 00:00:00 +0000102{
DRCe5eaf372014-05-09 18:00:32 +0000103 return 0; /* just set max_memory_to_use to 0 */
Thomas G. Lane4a6b7301992-03-17 00:00:00 +0000104}
105
Thomas G. Lane489583f1996-02-07 00:00:00 +0000106GLOBAL(void)
DRC19c791c2018-03-08 10:55:20 -0600107jpeg_mem_term(j_common_ptr cinfo)
Thomas G. Lane4a6b7301992-03-17 00:00:00 +0000108{
109 /* no work */
110}