ReactOS  0.4.15-dev-1070-ge1a01de
jmemnobs.c
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1 /*
2  * jmemnobs.c
3  *
4  * Copyright (C) 1992-1996, Thomas G. Lane.
5  * Modified 2019 by Guido Vollbeding.
6  * This file is part of the Independent JPEG Group's software.
7  * For conditions of distribution and use, see the accompanying README file.
8  *
9  * This file provides a really simple implementation of the system-
10  * dependent portion of the JPEG memory manager. This implementation
11  * assumes that no backing-store files are needed: all required space
12  * can be obtained from malloc().
13  * This is very portable in the sense that it'll compile on almost anything,
14  * but you'd better have lots of main memory (or virtual memory) if you want
15  * to process big images.
16  * Note that the max_memory_to_use option is respected by this implementation.
17  */
18 
19 #define JPEG_INTERNALS
20 #include "jinclude.h"
21 #include "jpeglib.h"
22 #include "jmemsys.h" /* import the system-dependent declarations */
23 
24 #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */
25 extern void * malloc JPP((size_t size));
26 extern void free JPP((void *ptr));
27 #endif
28 
29 
30 /*
31  * Memory allocation and freeing are controlled by the regular library
32  * routines malloc() and free().
33  */
34 
35 GLOBAL(void *)
37 {
38  return (void *) malloc(sizeofobject);
39 }
40 
41 GLOBAL(void)
42 jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
43 {
44  free(object);
45 }
46 
47 
48 /*
49  * "Large" objects are treated the same as "small" ones.
50  * NB: although we include FAR keywords in the routine declarations,
51  * this file won't actually work in 80x86 small/medium model; at least,
52  * you probably won't be able to process useful-size images in only 64KB.
53  */
54 
55 GLOBAL(void FAR *)
57 {
58  return (void FAR *) malloc(sizeofobject);
59 }
60 
61 GLOBAL(void)
62 jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
63 {
64  free(object);
65 }
66 
67 
68 /*
69  * This routine computes the total memory space available for allocation.
70  */
71 
72 GLOBAL(long)
75 {
76  if (cinfo->mem->max_memory_to_use)
77  return cinfo->mem->max_memory_to_use - already_allocated;
78 
79  /* Here we say, "we got all you want bud!" */
80  return max_bytes_needed;
81 }
82 
83 
84 /*
85  * Backing store (temporary file) management.
86  * Since jpeg_mem_available always promised the moon,
87  * this should never be called and we can just error out.
88  */
89 
90 GLOBAL(void)
92  long total_bytes_needed)
93 {
94  ERREXIT(cinfo, JERR_NO_BACKING_STORE);
95 }
96 
97 
98 /*
99  * These routines take care of any system-dependent initialization and
100  * cleanup required. Here, there isn't any.
101  */
102 
103 GLOBAL(long)
105 {
106  return 0; /* just set max_memory_to_use to 0 */
107 }
108 
109 GLOBAL(void)
111 {
112  /* no work */
113 }
#define ERREXIT(msg)
Definition: rdjpgcom.c:72
long long max_bytes_needed
Definition: jmemsys.h:104
#define free
Definition: debug_ros.c:5
void *malloc JPP((size_t size))
size_t sizeofobject
Definition: jmemsys.h:47
static PVOID ptr
Definition: dispmode.c:27
backing_store_ptr long total_bytes_needed
Definition: jmemsys.h:181
jpeg_free_large(j_common_ptr cinfo, void FAR *object, size_t sizeofobject)
Definition: jmemnobs.c:62
jpeg_mem_term(j_common_ptr cinfo)
Definition: jmemnobs.c:110
GLsizeiptr size
Definition: glext.h:5919
long min_bytes_needed
Definition: jmemsys.h:104
jpeg_open_backing_store(j_common_ptr cinfo, backing_store_ptr info, long total_bytes_needed)
Definition: jmemnobs.c:91
jpeg_get_large(j_common_ptr cinfo, size_t sizeofobject)
Definition: jmemnobs.c:56
long long long already_allocated
Definition: jmemsys.h:104
jpeg_mem_available(j_common_ptr cinfo, long min_bytes_needed, long max_bytes_needed, long already_allocated)
Definition: jmemnobs.c:73
#define GLOBAL(type)
Definition: jmorecfg.h:291
jpeg_free_small(j_common_ptr cinfo, void *object, size_t sizeofobject)
Definition: jmemnobs.c:42
#define malloc
Definition: debug_ros.c:4
jpeg_mem_init(j_common_ptr cinfo)
Definition: jmemnobs.c:104
#define FAR
Definition: zlib.h:34
jpeg_get_small(j_common_ptr cinfo, size_t sizeofobject)
Definition: jmemnobs.c:36