/[pcsx2_0.9.7]/branch/r3113_0.9.7_beta/3rdparty/libjpeg/jmemansi.c
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Revision 31 - (hide annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (10 years, 7 months ago) by william
Original Path: trunk/3rdparty/libjpeg/jmemansi.c
File MIME type: text/plain
File size: 4610 byte(s)
committing r3113 initial commit again...
1 william 31 /*
2     * jmemansi.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 simple generic implementation of the system-
9     * dependent portion of the JPEG memory manager. This implementation
10     * assumes that you have the ANSI-standard library routine tmpfile().
11     * Also, the problem of determining the amount of memory available
12     * is shoved onto the user.
13     */
14    
15     #define JPEG_INTERNALS
16     #include "jinclude.h"
17     #include "jpeglib.h"
18     #include "jmemsys.h" /* import the system-dependent declarations */
19    
20     #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */
21     extern void * malloc JPP((size_t size));
22     extern void free JPP((void *ptr));
23     #endif
24    
25     #ifndef SEEK_SET /* pre-ANSI systems may not define this; */
26     #define SEEK_SET 0 /* if not, assume 0 is correct */
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 *)
36     jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
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 *)
56     jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
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     * It's impossible to do this in a portable way; our current solution is
71     * to make the user tell us (with a default value set at compile time).
72     * If you can actually get the available space, it's a good idea to subtract
73     * a slop factor of 5% or so.
74     */
75    
76     #ifndef DEFAULT_MAX_MEM /* so can override from makefile */
77     #define DEFAULT_MAX_MEM 1000000L /* default: one megabyte */
78     #endif
79    
80     GLOBAL(long)
81     jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
82     long max_bytes_needed, long already_allocated)
83     {
84     return cinfo->mem->max_memory_to_use - already_allocated;
85     }
86    
87    
88     /*
89     * Backing store (temporary file) management.
90     * Backing store objects are only used when the value returned by
91     * jpeg_mem_available is less than the total space needed. You can dispense
92     * with these routines if you have plenty of virtual memory; see jmemnobs.c.
93     */
94    
95    
96     METHODDEF(void)
97     read_backing_store (j_common_ptr cinfo, backing_store_ptr info,
98     void FAR * buffer_address,
99     long file_offset, long byte_count)
100     {
101     if (fseek(info->temp_file, file_offset, SEEK_SET))
102     ERREXIT(cinfo, JERR_TFILE_SEEK);
103     if (JFREAD(info->temp_file, buffer_address, byte_count)
104     != (size_t) byte_count)
105     ERREXIT(cinfo, JERR_TFILE_READ);
106     }
107    
108    
109     METHODDEF(void)
110     write_backing_store (j_common_ptr cinfo, backing_store_ptr info,
111     void FAR * buffer_address,
112     long file_offset, long byte_count)
113     {
114     if (fseek(info->temp_file, file_offset, SEEK_SET))
115     ERREXIT(cinfo, JERR_TFILE_SEEK);
116     if (JFWRITE(info->temp_file, buffer_address, byte_count)
117     != (size_t) byte_count)
118     ERREXIT(cinfo, JERR_TFILE_WRITE);
119     }
120    
121    
122     METHODDEF(void)
123     close_backing_store (j_common_ptr cinfo, backing_store_ptr info)
124     {
125     fclose(info->temp_file);
126     /* Since this implementation uses tmpfile() to create the file,
127     * no explicit file deletion is needed.
128     */
129     }
130    
131    
132     /*
133     * Initial opening of a backing-store object.
134     *
135     * This version uses tmpfile(), which constructs a suitable file name
136     * behind the scenes. We don't have to use info->temp_name[] at all;
137     * indeed, we can't even find out the actual name of the temp file.
138     */
139    
140     GLOBAL(void)
141     jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
142     long total_bytes_needed)
143     {
144     if ((info->temp_file = tmpfile()) == NULL)
145     ERREXITS(cinfo, JERR_TFILE_CREATE, "");
146     info->read_backing_store = read_backing_store;
147     info->write_backing_store = write_backing_store;
148     info->close_backing_store = close_backing_store;
149     }
150    
151    
152     /*
153     * These routines take care of any system-dependent initialization and
154     * cleanup required.
155     */
156    
157     GLOBAL(long)
158     jpeg_mem_init (j_common_ptr cinfo)
159     {
160     return DEFAULT_MAX_MEM; /* default for max_memory_to_use */
161     }
162    
163     GLOBAL(void)
164     jpeg_mem_term (j_common_ptr cinfo)
165     {
166     /* no work */
167     }

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