1 /*
2 * jmemnobs.c
3 *
4 * Copyright (C) 1992-1996, Thomas G. Lane.
5 * 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
18 #define JPEG_INTERNALS
19 #include "jinclude.h"
20 #include "jpeglib.h"
21 #include "jmemsys.h" /* import the system-dependent declarations */
22
23 #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */
24 extern void * malloc JPP((size_t size));
25 extern void free JPP((void *ptr));
26 #endif
27
28 void* FXMEM_DefaultAlloc(int byte_size, int);
29 void FXMEM_DefaultFree(void* pointer, int);
30
31 /*
32 * Memory allocation and freeing are controlled by the regular library
33 * routines malloc() and free().
34 */
35
36 GLOBAL(void *)
jpeg_get_small(j_common_ptr cinfo,size_t sizeofobject)37 jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
38 {
39 // return (void *) malloc(sizeofobject);
40 return FXMEM_DefaultAlloc(sizeofobject, 0);
41 }
42
43 GLOBAL(void)
jpeg_free_small(j_common_ptr cinfo,void * object,size_t sizeofobject)44 jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
45 {
46 // free(object);
47 FXMEM_DefaultFree(object, 0);
48 }
49
50
51 /*
52 * "Large" objects are treated the same as "small" ones.
53 * NB: although we include FAR keywords in the routine declarations,
54 * this file won't actually work in 80x86 small/medium model; at least,
55 * you probably won't be able to process useful-size images in only 64KB.
56 */
57
58 GLOBAL(void FAR *)
jpeg_get_large(j_common_ptr cinfo,size_t sizeofobject)59 jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
60 {
61 // return (void FAR *) malloc(sizeofobject);
62 return FXMEM_DefaultAlloc(sizeofobject, 0);
63 }
64
65 GLOBAL(void)
jpeg_free_large(j_common_ptr cinfo,void FAR * object,size_t sizeofobject)66 jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
67 {
68 // free(object);
69 FXMEM_DefaultFree(object, 0);
70 }
71
72
73 /*
74 * This routine computes the total memory space available for allocation.
75 * Here we always say, "we got all you want bud!"
76 */
77
78 GLOBAL(long)
jpeg_mem_available(j_common_ptr cinfo,long min_bytes_needed,long max_bytes_needed,long already_allocated)79 jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
80 long max_bytes_needed, long already_allocated)
81 {
82 return max_bytes_needed;
83 }
84
85
86 /*
87 * Backing store (temporary file) management.
88 * Since jpeg_mem_available always promised the moon,
89 * this should never be called and we can just error out.
90 */
91
92 GLOBAL(void)
jpeg_open_backing_store(j_common_ptr cinfo,backing_store_ptr info,long total_bytes_needed)93 jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
94 long total_bytes_needed)
95 {
96 ERREXIT(cinfo, JERR_NO_BACKING_STORE);
97 }
98
99
100 /*
101 * These routines take care of any system-dependent initialization and
102 * cleanup required. Here, there isn't any.
103 */
104
105 GLOBAL(long)
jpeg_mem_init(j_common_ptr cinfo)106 jpeg_mem_init (j_common_ptr cinfo)
107 {
108 return 0; /* just set max_memory_to_use to 0 */
109 }
110
111 GLOBAL(void)
jpeg_mem_term(j_common_ptr cinfo)112 jpeg_mem_term (j_common_ptr cinfo)
113 {
114 /* no work */
115 }
116