diff options
Diffstat (limited to 'code/jpeg-6/jmemname.c')
-rwxr-xr-x | code/jpeg-6/jmemname.c | 542 |
1 files changed, 271 insertions, 271 deletions
diff --git a/code/jpeg-6/jmemname.c b/code/jpeg-6/jmemname.c index a3f6494..ba826fb 100755 --- a/code/jpeg-6/jmemname.c +++ b/code/jpeg-6/jmemname.c @@ -1,271 +1,271 @@ -/*
- * jmemname.c
- *
- * Copyright (C) 1992-1994, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This file provides a generic implementation of the system-dependent
- * portion of the JPEG memory manager. This implementation assumes that
- * you must explicitly construct a name for each temp file.
- * Also, the problem of determining the amount of memory available
- * is shoved onto the user.
- */
-
-#define JPEG_INTERNALS
-#include "jinclude.h"
-#include "jpeglib.h"
-#include "jmemsys.h" /* import the system-dependent declarations */
-
-#ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */
-extern void * malloc JPP((size_t size));
-extern void free JPP((void *ptr));
-#endif
-
-#ifndef SEEK_SET /* pre-ANSI systems may not define this; */
-#define SEEK_SET 0 /* if not, assume 0 is correct */
-#endif
-
-#ifdef DONT_USE_B_MODE /* define mode parameters for fopen() */
-#define READ_BINARY "r"
-#define RW_BINARY "w+"
-#else
-#define READ_BINARY "rb"
-#define RW_BINARY "w+b"
-#endif
-
-
-/*
- * Selection of a file name for a temporary file.
- * This is system-dependent!
- *
- * The code as given is suitable for most Unix systems, and it is easily
- * modified for most non-Unix systems. Some notes:
- * 1. The temp file is created in the directory named by TEMP_DIRECTORY.
- * The default value is /usr/tmp, which is the conventional place for
- * creating large temp files on Unix. On other systems you'll probably
- * want to change the file location. You can do this by editing the
- * #define, or (preferred) by defining TEMP_DIRECTORY in jconfig.h.
- *
- * 2. If you need to change the file name as well as its location,
- * you can override the TEMP_FILE_NAME macro. (Note that this is
- * actually a printf format string; it must contain %s and %d.)
- * Few people should need to do this.
- *
- * 3. mktemp() is used to ensure that multiple processes running
- * simultaneously won't select the same file names. If your system
- * doesn't have mktemp(), define NO_MKTEMP to do it the hard way.
- * (If you don't have <errno.h>, also define NO_ERRNO_H.)
- *
- * 4. You probably want to define NEED_SIGNAL_CATCHER so that cjpeg.c/djpeg.c
- * will cause the temp files to be removed if you stop the program early.
- */
-
-#ifndef TEMP_DIRECTORY /* can override from jconfig.h or Makefile */
-#define TEMP_DIRECTORY "/usr/tmp/" /* recommended setting for Unix */
-#endif
-
-static int next_file_num; /* to distinguish among several temp files */
-
-#ifdef NO_MKTEMP
-
-#ifndef TEMP_FILE_NAME /* can override from jconfig.h or Makefile */
-#define TEMP_FILE_NAME "%sJPG%03d.TMP"
-#endif
-
-#ifndef NO_ERRNO_H
-#include <errno.h> /* to define ENOENT */
-#endif
-
-/* ANSI C specifies that errno is a macro, but on older systems it's more
- * likely to be a plain int variable. And not all versions of errno.h
- * bother to declare it, so we have to in order to be most portable. Thus:
- */
-#ifndef errno
-extern int errno;
-#endif
-
-
-LOCAL void
-select_file_name (char * fname)
-{
- FILE * tfile;
-
- /* Keep generating file names till we find one that's not in use */
- for (;;) {
- next_file_num++; /* advance counter */
- sprintf(fname, TEMP_FILE_NAME, TEMP_DIRECTORY, next_file_num);
- if ((tfile = fopen(fname, READ_BINARY)) == NULL) {
- /* fopen could have failed for a reason other than the file not
- * being there; for example, file there but unreadable.
- * If <errno.h> isn't available, then we cannot test the cause.
- */
-#ifdef ENOENT
- if (errno != ENOENT)
- continue;
-#endif
- break;
- }
- fclose(tfile); /* oops, it's there; close tfile & try again */
- }
-}
-
-#else /* ! NO_MKTEMP */
-
-/* Note that mktemp() requires the initial filename to end in six X's */
-#ifndef TEMP_FILE_NAME /* can override from jconfig.h or Makefile */
-#define TEMP_FILE_NAME "%sJPG%dXXXXXX"
-#endif
-
-LOCAL void
-select_file_name (char * fname)
-{
- 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 */
-}
-
-#endif /* NO_MKTEMP */
-
-
-/*
- * Memory allocation and freeing are controlled by the regular library
- * routines malloc() and free().
- */
-
-GLOBAL void *
-jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
-{
- return (void *) malloc(sizeofobject);
-}
-
-GLOBAL void
-jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
-{
- free(object);
-}
-
-
-/*
- * "Large" objects are treated the same as "small" ones.
- * NB: although we include FAR keywords in the routine declarations,
- * this file won't actually work in 80x86 small/medium model; at least,
- * you probably won't be able to process useful-size images in only 64KB.
- */
-
-GLOBAL void FAR *
-jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
-{
- return (void FAR *) malloc(sizeofobject);
-}
-
-GLOBAL void
-jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
-{
- free(object);
-}
-
-
-/*
- * This routine computes the total memory space available for allocation.
- * It's impossible to do this in a portable way; our current solution is
- * to make the user tell us (with a default value set at compile time).
- * If you can actually get the available space, it's a good idea to subtract
- * a slop factor of 5% or so.
- */
-
-#ifndef DEFAULT_MAX_MEM /* so can override from makefile */
-#define DEFAULT_MAX_MEM 1000000L /* default: one megabyte */
-#endif
-
-GLOBAL long
-jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
- long max_bytes_needed, long already_allocated)
-{
- return cinfo->mem->max_memory_to_use - already_allocated;
-}
-
-
-/*
- * Backing store (temporary file) management.
- * Backing store objects are only used when the value returned by
- * jpeg_mem_available is less than the total space needed. You can dispense
- * with these routines if you have plenty of virtual memory; see jmemnobs.c.
- */
-
-
-METHODDEF void
-read_backing_store (j_common_ptr cinfo, backing_store_ptr info,
- void FAR * buffer_address,
- long file_offset, long byte_count)
-{
- 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);
-}
-
-
-METHODDEF void
-write_backing_store (j_common_ptr cinfo, backing_store_ptr info,
- void FAR * buffer_address,
- long file_offset, long byte_count)
-{
- 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);
-}
-
-
-METHODDEF void
-close_backing_store (j_common_ptr cinfo, backing_store_ptr info)
-{
- 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);
-}
-
-
-/*
- * Initial opening of a backing-store object.
- */
-
-GLOBAL void
-jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
- long total_bytes_needed)
-{
- 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);
-}
-
-
-/*
- * These routines take care of any system-dependent initialization and
- * cleanup required.
- */
-
-GLOBAL long
-jpeg_mem_init (j_common_ptr cinfo)
-{
- next_file_num = 0; /* initialize temp file name generator */
- return DEFAULT_MAX_MEM; /* default for max_memory_to_use */
-}
-
-GLOBAL void
-jpeg_mem_term (j_common_ptr cinfo)
-{
- /* no work */
-}
+/* + * jmemname.c + * + * Copyright (C) 1992-1994, Thomas G. Lane. + * This file is part of the Independent JPEG Group's software. + * For conditions of distribution and use, see the accompanying README file. + * + * This file provides a generic implementation of the system-dependent + * portion of the JPEG memory manager. This implementation assumes that + * you must explicitly construct a name for each temp file. + * Also, the problem of determining the amount of memory available + * is shoved onto the user. + */ + +#define JPEG_INTERNALS +#include "jinclude.h" +#include "jpeglib.h" +#include "jmemsys.h" /* import the system-dependent declarations */ + +#ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */ +extern void * malloc JPP((size_t size)); +extern void free JPP((void *ptr)); +#endif + +#ifndef SEEK_SET /* pre-ANSI systems may not define this; */ +#define SEEK_SET 0 /* if not, assume 0 is correct */ +#endif + +#ifdef DONT_USE_B_MODE /* define mode parameters for fopen() */ +#define READ_BINARY "r" +#define RW_BINARY "w+" +#else +#define READ_BINARY "rb" +#define RW_BINARY "w+b" +#endif + + +/* + * Selection of a file name for a temporary file. + * This is system-dependent! + * + * The code as given is suitable for most Unix systems, and it is easily + * modified for most non-Unix systems. Some notes: + * 1. The temp file is created in the directory named by TEMP_DIRECTORY. + * The default value is /usr/tmp, which is the conventional place for + * creating large temp files on Unix. On other systems you'll probably + * want to change the file location. You can do this by editing the + * #define, or (preferred) by defining TEMP_DIRECTORY in jconfig.h. + * + * 2. If you need to change the file name as well as its location, + * you can override the TEMP_FILE_NAME macro. (Note that this is + * actually a printf format string; it must contain %s and %d.) + * Few people should need to do this. + * + * 3. mktemp() is used to ensure that multiple processes running + * simultaneously won't select the same file names. If your system + * doesn't have mktemp(), define NO_MKTEMP to do it the hard way. + * (If you don't have <errno.h>, also define NO_ERRNO_H.) + * + * 4. You probably want to define NEED_SIGNAL_CATCHER so that cjpeg.c/djpeg.c + * will cause the temp files to be removed if you stop the program early. + */ + +#ifndef TEMP_DIRECTORY /* can override from jconfig.h or Makefile */ +#define TEMP_DIRECTORY "/usr/tmp/" /* recommended setting for Unix */ +#endif + +static int next_file_num; /* to distinguish among several temp files */ + +#ifdef NO_MKTEMP + +#ifndef TEMP_FILE_NAME /* can override from jconfig.h or Makefile */ +#define TEMP_FILE_NAME "%sJPG%03d.TMP" +#endif + +#ifndef NO_ERRNO_H +#include <errno.h> /* to define ENOENT */ +#endif + +/* ANSI C specifies that errno is a macro, but on older systems it's more + * likely to be a plain int variable. And not all versions of errno.h + * bother to declare it, so we have to in order to be most portable. Thus: + */ +#ifndef errno +extern int errno; +#endif + + +LOCAL void +select_file_name (char * fname) +{ + FILE * tfile; + + /* Keep generating file names till we find one that's not in use */ + for (;;) { + next_file_num++; /* advance counter */ + sprintf(fname, TEMP_FILE_NAME, TEMP_DIRECTORY, next_file_num); + if ((tfile = fopen(fname, READ_BINARY)) == NULL) { + /* fopen could have failed for a reason other than the file not + * being there; for example, file there but unreadable. + * If <errno.h> isn't available, then we cannot test the cause. + */ +#ifdef ENOENT + if (errno != ENOENT) + continue; +#endif + break; + } + fclose(tfile); /* oops, it's there; close tfile & try again */ + } +} + +#else /* ! NO_MKTEMP */ + +/* Note that mktemp() requires the initial filename to end in six X's */ +#ifndef TEMP_FILE_NAME /* can override from jconfig.h or Makefile */ +#define TEMP_FILE_NAME "%sJPG%dXXXXXX" +#endif + +LOCAL void +select_file_name (char * fname) +{ + 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 */ +} + +#endif /* NO_MKTEMP */ + + +/* + * Memory allocation and freeing are controlled by the regular library + * routines malloc() and free(). + */ + +GLOBAL void * +jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject) +{ + return (void *) malloc(sizeofobject); +} + +GLOBAL void +jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject) +{ + free(object); +} + + +/* + * "Large" objects are treated the same as "small" ones. + * NB: although we include FAR keywords in the routine declarations, + * this file won't actually work in 80x86 small/medium model; at least, + * you probably won't be able to process useful-size images in only 64KB. + */ + +GLOBAL void FAR * +jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject) +{ + return (void FAR *) malloc(sizeofobject); +} + +GLOBAL void +jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject) +{ + free(object); +} + + +/* + * This routine computes the total memory space available for allocation. + * It's impossible to do this in a portable way; our current solution is + * to make the user tell us (with a default value set at compile time). + * If you can actually get the available space, it's a good idea to subtract + * a slop factor of 5% or so. + */ + +#ifndef DEFAULT_MAX_MEM /* so can override from makefile */ +#define DEFAULT_MAX_MEM 1000000L /* default: one megabyte */ +#endif + +GLOBAL long +jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed, + long max_bytes_needed, long already_allocated) +{ + return cinfo->mem->max_memory_to_use - already_allocated; +} + + +/* + * Backing store (temporary file) management. + * Backing store objects are only used when the value returned by + * jpeg_mem_available is less than the total space needed. You can dispense + * with these routines if you have plenty of virtual memory; see jmemnobs.c. + */ + + +METHODDEF void +read_backing_store (j_common_ptr cinfo, backing_store_ptr info, + void FAR * buffer_address, + long file_offset, long byte_count) +{ + 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); +} + + +METHODDEF void +write_backing_store (j_common_ptr cinfo, backing_store_ptr info, + void FAR * buffer_address, + long file_offset, long byte_count) +{ + 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); +} + + +METHODDEF void +close_backing_store (j_common_ptr cinfo, backing_store_ptr info) +{ + 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); +} + + +/* + * Initial opening of a backing-store object. + */ + +GLOBAL void +jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info, + long total_bytes_needed) +{ + 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); +} + + +/* + * These routines take care of any system-dependent initialization and + * cleanup required. + */ + +GLOBAL long +jpeg_mem_init (j_common_ptr cinfo) +{ + next_file_num = 0; /* initialize temp file name generator */ + return DEFAULT_MAX_MEM; /* default for max_memory_to_use */ +} + +GLOBAL void +jpeg_mem_term (j_common_ptr cinfo) +{ + /* no work */ +} |