jmemname.c File Reference

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

Include dependency graph for jmemname.c:

Go to the source code of this file.

Macros
#define	JPEG_INTERNALS
#define	SEEK_SET   0 /* if not, assume 0 is correct */
#define	READ_BINARY   "rb"
#define	RW_BINARY   "w+b"
#define	TEMP_DIRECTORY   "/usr/tmp/" /* recommended setting for Unix */
#define	TEMP_FILE_NAME   "%sJPG%dXXXXXX"
#define	DEFAULT_MAX_MEM   1000000L /* default: one megabyte */

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
static int	next_file_num

Macro Definition Documentation

DEFAULT_MAX_MEM

#define DEFAULT_MAX_MEM   1000000L /* default: one megabyte */

Definition at line 184 of file jmemname.c.

JPEG_INTERNALS

#define JPEG_INTERNALS

Definition at line 15 of file jmemname.c.

READ_BINARY

#define READ_BINARY   "rb"

Definition at line 37 of file jmemname.c.

RW_BINARY

#define RW_BINARY   "w+b"

Definition at line 38 of file jmemname.c.

SEEK_SET

#define SEEK_SET   0 /* if not, assume 0 is correct */

Definition at line 26 of file jmemname.c.

TEMP_DIRECTORY

#define TEMP_DIRECTORY   "/usr/tmp/" /* recommended setting for Unix */

Definition at line 70 of file jmemname.c.

TEMP_FILE_NAME

#define TEMP_FILE_NAME   "%sJPG%dXXXXXX"

Definition at line 122 of file jmemname.c.

Function Documentation

close_backing_store()

close_backing_store	(	j_common_ptr	cinfo,
		backing_store_ptr	info
	)

Definition at line 230 of file jmemname.c.

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

Referenced by jpeg_open_backing_store().

jpeg_free_large()

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

Definition at line 169 of file jmemname.c.

{
  free(object);
}

jpeg_free_small()

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

Definition at line 149 of file jmemname.c.

{
  free(object);
}

jpeg_get_large()

jpeg_get_large	(	j_common_ptr	cinfo,
		size_t	sizeofobject
	)

Definition at line 163 of file jmemname.c.

{
  return (void FAR *) malloc(sizeofobject);
}

jpeg_get_small()

jpeg_get_small	(	j_common_ptr	cinfo,
		size_t	sizeofobject
	)

Definition at line 143 of file jmemname.c.

{
  return (void *) malloc(sizeofobject);
}

jpeg_mem_available()

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.

{
  return cinfo->mem->max_memory_to_use - already_allocated;
}

jpeg_mem_init()

jpeg_mem_init

(

j_common_ptr

cinfo

)

Definition at line 266 of file jmemname.c.

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

jpeg_mem_term()

jpeg_mem_term

(

j_common_ptr

cinfo

)

Definition at line 273 of file jmemname.c.

{
  /* no work */
}

jpeg_open_backing_store()

jpeg_open_backing_store	(	j_common_ptr	cinfo,
		backing_store_ptr	info,
		long	total_bytes_needed
	)

Definition at line 247 of file jmemname.c.

{
  select_file_name(info->temp_name);
  if ((info->temp_file = fopen(info->temp_name, RW_BINARY)) == NULL)
    ERREXITS(cinfo, JERR_TFILE_CREATE, info->temp_name);
  info->read_backing_store = read_backing_store;
  info->write_backing_store = write_backing_store;
  info->close_backing_store = close_backing_store;
  TRACEMSS(cinfo, 1, JTRC_TFILE_OPEN, info->temp_name);
}

JPP() [1/2]

void *malloc JPP

(

(size_t size)

)

JPP() [2/2]

void free JPP

(

(void *ptr)

)

read_backing_store()

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.

{
  if (fseek(info->temp_file, file_offset, SEEK_SET))
    ERREXIT(cinfo, JERR_TFILE_SEEK);
  if (JFREAD(info->temp_file, buffer_address, byte_count)
      != (size_t) byte_count)
    ERREXIT(cinfo, JERR_TFILE_READ);
}

Referenced by jpeg_open_backing_store().

select_file_name()

select_file_name

(

char *

fname

)

Definition at line 126 of file jmemname.c.

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

Referenced by jpeg_open_backing_store().

write_backing_store()

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.

{
  if (fseek(info->temp_file, file_offset, SEEK_SET))
    ERREXIT(cinfo, JERR_TFILE_SEEK);
  if (JFWRITE(info->temp_file, buffer_address, byte_count)
      != (size_t) byte_count)
    ERREXIT(cinfo, JERR_TFILE_WRITE);
}

Referenced by jpeg_open_backing_store().

Variable Documentation

next_file_num

int next_file_num

static

Definition at line 73 of file jmemname.c.

Referenced by jpeg_mem_init(), and select_file_name().