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jmemname.c File Reference

#include "jinclude.h"
#include "jpeglib.h"
#include "jmemsys.h"

Go to the source code of this file.


Defines

#define JPEG_INTERNALS
#define SEEK_SET   0
#define READ_BINARY   "rb"
#define RW_BINARY   "w+b"
#define TEMP_DIRECTORY   "/usr/tmp/"
#define TEMP_FILE_NAME   "%sJPG%dXXXXXX"
#define DEFAULT_MAX_MEM   1000000L

Functions

void *malloc JPP ((size_t size))
void free JPP ((void *ptr))
 select_file_name (char *fname)
 jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
 jpeg_free_small (j_common_ptr cinfo, void *object, size_t sizeofobject)
 jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
 jpeg_free_large (j_common_ptr cinfo, void FAR *object, size_t sizeofobject)
 jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed, long max_bytes_needed, long already_allocated)
 read_backing_store (j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
 write_backing_store (j_common_ptr cinfo, backing_store_ptr info, void FAR *buffer_address, long file_offset, long byte_count)
 close_backing_store (j_common_ptr cinfo, backing_store_ptr info)
 jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info, long total_bytes_needed)
 jpeg_mem_init (j_common_ptr cinfo)
 jpeg_mem_term (j_common_ptr cinfo)

Variables

int next_file_num

Define Documentation

#define DEFAULT_MAX_MEM   1000000L
 

Definition at line 184 of file jmemname.c.

Referenced by jpeg_mem_init().

#define JPEG_INTERNALS
 

Definition at line 15 of file jmemname.c.

#define READ_BINARY   "rb"
 

Definition at line 37 of file jmemname.c.

#define RW_BINARY   "w+b"
 

Definition at line 38 of file jmemname.c.

Referenced by jpeg_open_backing_store().

#define SEEK_SET   0
 

Definition at line 26 of file jmemname.c.

Referenced by read_backing_store(), and write_backing_store().

#define TEMP_DIRECTORY   "/usr/tmp/"
 

Definition at line 70 of file jmemname.c.

Referenced by select_file_name().

#define TEMP_FILE_NAME   "%sJPG%dXXXXXX"
 

Definition at line 122 of file jmemname.c.

Referenced by select_file_name().

Function Documentation

close_backing_store (  j_common_ptr    cinfo,
backing_store_ptr    info
) 
 

Definition at line 230 of file jmemname.c.

References backing_store_struct::temp_file, backing_store_struct::temp_name, TRACEMSS, and unlink.

Referenced by jpeg_open_backing_store(). 

00231 {
00232   fclose(info->temp_file);      /* close the file */
00233   unlink(info->temp_name);      /* delete the file */
00234 /* If your system doesn't have unlink(), use remove() instead.
00235  * remove() is the ANSI-standard name for this function, but if
00236  * your system was ANSI you'd be using jmemansi.c, right?
00237  */
00238   TRACEMSS(cinfo, 1, JTRC_TFILE_CLOSE, info->temp_name);
00239 }

jpeg_free_large (  j_common_ptr    cinfo,
void FAR *    object,
size_t    sizeofobject
) 
 

Definition at line 169 of file jmemname.c.

References free, object, and sizeofobject. 

00170 {
00171   free(object);
00172 }

jpeg_free_small (  j_common_ptr    cinfo,
void *    object,
size_t    sizeofobject
) 
 

Definition at line 149 of file jmemname.c.

References free, object, and sizeofobject. 

00150 {
00151   free(object);
00152 }

jpeg_get_large (  j_common_ptr    cinfo,
size_t    sizeofobject
) 
 

Definition at line 163 of file jmemname.c.

References malloc, and sizeofobject. 

00164 {
00165   return (void FAR *) malloc(sizeofobject);
00166 }

jpeg_get_small (  j_common_ptr    cinfo,
size_t    sizeofobject
) 
 

Definition at line 143 of file jmemname.c.

References malloc, and sizeofobject. 

00144 {
00145   return (void *) malloc(sizeofobject);
00146 }

jpeg_mem_available (  j_common_ptr    cinfo,
long    min_bytes_needed,
long    max_bytes_needed,
long    already_allocated
) 
 

Definition at line 188 of file jmemname.c.

References already_allocated, max_bytes_needed, and min_bytes_needed. 

00190 {
00191   return cinfo->mem->max_memory_to_use - already_allocated;
00192 }

jpeg_mem_init (  j_common_ptr    cinfo ) 
 

Definition at line 266 of file jmemname.c.

References DEFAULT_MAX_MEM, and next_file_num. 

00267 {
00268   next_file_num = 0;            /* initialize temp file name generator */
00269   return DEFAULT_MAX_MEM;       /* default for max_memory_to_use */
00270 }

jpeg_mem_term (  j_common_ptr    cinfo ) 
 

Definition at line 273 of file jmemname.c. 

00274 {
00275   /* no work */
00276 }

jpeg_open_backing_store (  j_common_ptr    cinfo,
backing_store_ptr    info,
long    total_bytes_needed
) 
 

Definition at line 247 of file jmemname.c.

References close_backing_store(), ERREXITS, read_backing_store(), RW_BINARY, select_file_name(), backing_store_struct::temp_file, backing_store_struct::temp_name, total_bytes_needed, TRACEMSS, and write_backing_store(). 

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 }

void free JPP (  (void *ptr)    ) 
 

void* malloc JPP (  (size_t size)    ) 
 

read_backing_store (  j_common_ptr    cinfo,
backing_store_ptr    info,
void FAR *    buffer_address,
long    file_offset,
long    byte_count
) 
 

Definition at line 204 of file jmemname.c.

References ERREXIT, JFREAD, SEEK_SET, and backing_store_struct::temp_file.

Referenced by jpeg_open_backing_store(). 

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 }

select_file_name (  char *    fname ) 
 

Definition at line 126 of file jmemname.c.

References mktemp(), next_file_num, TEMP_DIRECTORY, and TEMP_FILE_NAME.

Referenced by jpeg_open_backing_store(), and open_file_store(). 

00127 {
00128   next_file_num++;              /* advance counter */
00129   sprintf(fname, TEMP_FILE_NAME, TEMP_DIRECTORY, next_file_num);
00130   mktemp(fname);                /* make sure file name is unique */
00131   /* mktemp replaces the trailing XXXXXX with a unique string of characters */
00132 }

write_backing_store (  j_common_ptr    cinfo,
backing_store_ptr    info,
void FAR *    buffer_address,
long    file_offset,
long    byte_count
) 
 

Definition at line 217 of file jmemname.c.

References ERREXIT, JERR_TFILE_WRITE, JFWRITE, SEEK_SET, and backing_store_struct::temp_file.

Referenced by jpeg_open_backing_store(). 

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 }

Variable Documentation

int next_file_num [static]
 

Definition at line 73 of file jmemname.c.

Referenced by jpeg_mem_init(), and select_file_name().

 
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