/src/gdal/build/frmts/jpeg/libjpeg12/jmemnobs12.c
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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 | | #include "cpl_port.h" |
24 | | |
25 | | #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */ |
26 | | extern void * malloc JPP((size_t size)); |
27 | | extern void free JPP((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 | | |
36 | | GLOBAL(void *) |
37 | | jpeg_get_small (CPL_UNUSED j_common_ptr cinfo, size_t sizeofobject) |
38 | 0 | { |
39 | 0 | return (void *) malloc(sizeofobject); |
40 | 0 | } |
41 | | |
42 | | GLOBAL(void) |
43 | | jpeg_free_small (CPL_UNUSED j_common_ptr cinfo, void * object, CPL_UNUSED size_t sizeofobject) |
44 | 0 | { |
45 | 0 | free(object); |
46 | 0 | } |
47 | | |
48 | | |
49 | | /* |
50 | | * "Large" objects are treated the same as "small" ones. |
51 | | * NB: although we include FAR keywords in the routine declarations, |
52 | | * this file won't actually work in 80x86 small/medium model; at least, |
53 | | * you probably won't be able to process useful-size images in only 64KB. |
54 | | */ |
55 | | |
56 | | GLOBAL(void FAR *) |
57 | | jpeg_get_large (CPL_UNUSED j_common_ptr cinfo, size_t sizeofobject) |
58 | 0 | { |
59 | 0 | return (void FAR *) malloc(sizeofobject); |
60 | 0 | } |
61 | | |
62 | | GLOBAL(void) |
63 | | jpeg_free_large (CPL_UNUSED j_common_ptr cinfo, void FAR * object, CPL_UNUSED size_t sizeofobject) |
64 | 0 | { |
65 | 0 | free(object); |
66 | 0 | } |
67 | | |
68 | | |
69 | | /* |
70 | | * This routine computes the total memory space available for allocation. |
71 | | * Here we always say, "we got all you want bud!" |
72 | | */ |
73 | | |
74 | | GLOBAL(long) |
75 | | jpeg_mem_available (CPL_UNUSED j_common_ptr cinfo, CPL_UNUSED long min_bytes_needed, |
76 | | long max_bytes_needed, CPL_UNUSED long already_allocated) |
77 | 0 | { |
78 | 0 | return max_bytes_needed; |
79 | 0 | } |
80 | | |
81 | | |
82 | | /* |
83 | | * Backing store (temporary file) management. |
84 | | * Since jpeg_mem_available always promised the moon, |
85 | | * this should never be called and we can just error out. |
86 | | */ |
87 | | |
88 | | GLOBAL(void) |
89 | | jpeg_open_backing_store (j_common_ptr cinfo, CPL_UNUSED backing_store_ptr info, |
90 | | CPL_UNUSED long total_bytes_needed) |
91 | 0 | { |
92 | 0 | ERREXIT(cinfo, JERR_NO_BACKING_STORE); |
93 | 0 | } |
94 | | |
95 | | |
96 | | /* |
97 | | * These routines take care of any system-dependent initialization and |
98 | | * cleanup required. Here, there isn't any. |
99 | | */ |
100 | | |
101 | | GLOBAL(long) |
102 | | jpeg_mem_init (CPL_UNUSED j_common_ptr cinfo) |
103 | 0 | { |
104 | 0 | return 0; /* just set max_memory_to_use to 0 */ |
105 | 0 | } |
106 | | |
107 | | GLOBAL(void) |
108 | | jpeg_mem_term (CPL_UNUSED j_common_ptr cinfo) |
109 | 0 | { |
110 | | /* no work */ |
111 | 0 | } |