From 22f703cab05b7cd368f4de9e03991b7664dc5022 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Mon, 1 Sep 2014 13:56:46 +0200 Subject: Initial import of argyll version 1.5.1-8 --- jpg/jmemname.c | 276 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 276 insertions(+) create mode 100644 jpg/jmemname.c (limited to 'jpg/jmemname.c') diff --git a/jpg/jmemname.c b/jpg/jmemname.c new file mode 100644 index 0000000..ed96dee --- /dev/null +++ b/jpg/jmemname.c @@ -0,0 +1,276 @@ +/* + * jmemname.c + * + * Copyright (C) 1992-1997, 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 /* 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 +#ifdef VMS /* VMS is very nonstandard */ +#define READ_BINARY "rb", "ctx=stm" +#define RW_BINARY "w+b", "ctx=stm" +#else /* standard ANSI-compliant case */ +#define READ_BINARY "rb" +#define RW_BINARY "w+b" +#endif +#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 , 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 /* 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 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 */ +} -- cgit v1.2.3