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00015 #define JPEG_INTERNALS
00016 #include "jinclude.h"
00017 #include "jpeglib.h"
00018 #include "jmemsys.h"
00019
00020 #ifndef HAVE_STDLIB_H
00021 extern void * malloc JPP((size_t size));
00022 extern void free JPP((void *ptr));
00023 #endif
00024
00025 #ifndef SEEK_SET
00026 #define SEEK_SET 0
00027 #endif
00028
00029 #ifdef DONT_USE_B_MODE
00030 #define READ_BINARY "r"
00031 #define RW_BINARY "w+"
00032 #else
00033 #ifdef VMS
00034 #define READ_BINARY "rb", "ctx=stm"
00035 #define RW_BINARY "w+b", "ctx=stm"
00036 #else
00037 #define READ_BINARY "rb"
00038 #define RW_BINARY "w+b"
00039 #endif
00040 #endif
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00069 #ifndef TEMP_DIRECTORY
00070 #define TEMP_DIRECTORY "/usr/tmp/"
00071 #endif
00072
00073 static int next_file_num;
00074
00075 #ifdef NO_MKTEMP
00076
00077 #ifndef TEMP_FILE_NAME
00078 #define TEMP_FILE_NAME "%sJPG%03d.TMP"
00079 #endif
00080
00081 #ifndef NO_ERRNO_H
00082 #include <errno.h>
00083 #endif
00084
00085
00086
00087
00088
00089 #ifndef errno
00090 extern int errno;
00091 #endif
00092
00093
00094 LOCAL(void)
00095 select_file_name (char * fname)
00096 {
00097 FILE * tfile;
00098
00099
00100 for (;;) {
00101 next_file_num++;
00102 sprintf(fname, TEMP_FILE_NAME, TEMP_DIRECTORY, next_file_num);
00103 if ((tfile = fopen(fname, READ_BINARY)) == NULL) {
00104
00105
00106
00107
00108 #ifdef ENOENT
00109 if (errno != ENOENT)
00110 continue;
00111 #endif
00112 break;
00113 }
00114 fclose(tfile);
00115 }
00116 }
00117
00118 #else
00119
00120
00121 #ifndef TEMP_FILE_NAME
00122 #define TEMP_FILE_NAME "%sJPG%dXXXXXX"
00123 #endif
00124
00125 LOCAL(void)
00126 select_file_name (char * fname)
00127 {
00128 next_file_num++;
00129 sprintf(fname, TEMP_FILE_NAME, TEMP_DIRECTORY, next_file_num);
00130 mktemp(fname);
00131
00132 }
00133
00134 #endif
00135
00136
00137
00138
00139
00140
00141
00142 GLOBAL(void *)
00143 jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
00144 {
00145 return (void *) malloc(sizeofobject);
00146 }
00147
00148 GLOBAL(void)
00149 jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
00150 {
00151 free(object);
00152 }
00153
00154
00155
00156
00157
00158
00159
00160
00161
00162 GLOBAL(void FAR *)
00163 jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
00164 {
00165 return (void FAR *) malloc(sizeofobject);
00166 }
00167
00168 GLOBAL(void)
00169 jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
00170 {
00171 free(object);
00172 }
00173
00174
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00181
00182
00183 #ifndef DEFAULT_MAX_MEM
00184 #define DEFAULT_MAX_MEM 1000000L
00185 #endif
00186
00187 GLOBAL(long)
00188 jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
00189 long max_bytes_needed, long already_allocated)
00190 {
00191 return cinfo->mem->max_memory_to_use - already_allocated;
00192 }
00193
00194
00195
00196
00197
00198
00199
00200
00201
00202
00203 METHODDEF(void)
00204 read_backing_store (j_common_ptr cinfo, backing_store_ptr info,
00205 void FAR * buffer_address,
00206 long file_offset, long byte_count)
00207 {
00208 if (fseek(info->temp_file, file_offset, SEEK_SET))
00209 ERREXIT(cinfo, JERR_TFILE_SEEK);
00210 if (JFREAD(info->temp_file, buffer_address, byte_count)
00211 != (size_t) byte_count)
00212 ERREXIT(cinfo, JERR_TFILE_READ);
00213 }
00214
00215
00216 METHODDEF(void)
00217 write_backing_store (j_common_ptr cinfo, backing_store_ptr info,
00218 void FAR * buffer_address,
00219 long file_offset, long byte_count)
00220 {
00221 if (fseek(info->temp_file, file_offset, SEEK_SET))
00222 ERREXIT(cinfo, JERR_TFILE_SEEK);
00223 if (JFWRITE(info->temp_file, buffer_address, byte_count)
00224 != (size_t) byte_count)
00225 ERREXIT(cinfo, JERR_TFILE_WRITE);
00226 }
00227
00228
00229 METHODDEF(void)
00230 close_backing_store (j_common_ptr cinfo, backing_store_ptr info)
00231 {
00232 fclose(info->temp_file);
00233 unlink(info->temp_name);
00234
00235
00236
00237
00238 TRACEMSS(cinfo, 1, JTRC_TFILE_CLOSE, info->temp_name);
00239 }
00240
00241
00242
00243
00244
00245
00246 GLOBAL(void)
00247 jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
00248 long total_bytes_needed)
00249 {
00250 select_file_name(info->temp_name);
00251 if ((info->temp_file = fopen(info->temp_name, RW_BINARY)) == NULL)
00252 ERREXITS(cinfo, JERR_TFILE_CREATE, info->temp_name);
00253 info->read_backing_store = read_backing_store;
00254 info->write_backing_store = write_backing_store;
00255 info->close_backing_store = close_backing_store;
00256 TRACEMSS(cinfo, 1, JTRC_TFILE_OPEN, info->temp_name);
00257 }
00258
00259
00260
00261
00262
00263
00264
00265 GLOBAL(long)
00266 jpeg_mem_init (j_common_ptr cinfo)
00267 {
00268 next_file_num = 0;
00269 return DEFAULT_MAX_MEM;
00270 }
00271
00272 GLOBAL(void)
00273 jpeg_mem_term (j_common_ptr cinfo)
00274 {
00275
00276 }