jinclude.h
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上传日期:2007-01-06
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- /*
- * jinclude.h
- *
- * Copyright (C) 1991-1994, 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 exists to provide a single place to fix any problems with
- * including the wrong system include files. (Common problems are taken
- * care of by the standard jconfig symbols, but on really weird systems
- * you may have to edit this file.)
- *
- * NOTE: this file is NOT intended to be included by applications using the
- * JPEG library. Most applications need only include jpeglib.h.
- */
- /* Include auto-config file to find out which system include files we need. */
- #include "jconfig.h" /* auto configuration options */
- #define JCONFIG_INCLUDED /* so that jpeglib.h doesn't do it again */
- /*
- * We need the NULL macro and size_t typedef.
- * On an ANSI-conforming system it is sufficient to include <stddef.h>.
- * Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to
- * pull in <sys/types.h> as well.
- * Note that the core JPEG library does not require <stdio.h>;
- * only the default error handler and data source/destination modules do.
- * But we must pull it in because of the references to FILE in jpeglib.h.
- * You can remove those references if you want to compile without <stdio.h>.
- */
- #ifdef HAVE_STDDEF_H
- #include <stddef.h>
- #endif
- #ifdef HAVE_STDLIB_H
- #include <stdlib.h>
- #endif
- #ifdef NEED_SYS_TYPES_H
- #include <sys/types.h>
- #endif
- #include <stdio.h>
- /*
- * We need memory copying and zeroing functions, plus strncpy().
- * ANSI and System V implementations declare these in <string.h>.
- * BSD doesn't have the mem() functions, but it does have bcopy()/bzero().
- * Some systems may declare memset and memcpy in <memory.h>.
- *
- * NOTE: we assume the size parameters to these functions are of type size_t.
- * Change the casts in these macros if not!
- */
- #ifdef NEED_BSD_STRINGS
- #include <strings.h>
- #define MEMZERO(target,size) bzero((void *)(target), (size_t)(size))
- #define MEMCOPY(dest,src,size) bcopy((const void *)(src), (void *)(dest), (size_t)(size))
- #else /* not BSD, assume ANSI/SysV string lib */
- #include <string.h>
- #define MEMZERO(target,size) memset((void *)(target), 0, (size_t)(size))
- #define MEMCOPY(dest,src,size) memcpy((void *)(dest), (const void *)(src), (size_t)(size))
- #endif
- /*
- * In ANSI C, and indeed any rational implementation, size_t is also the
- * type returned by sizeof(). However, it seems there are some irrational
- * implementations out there, in which sizeof() returns an int even though
- * size_t is defined as long or unsigned long. To ensure consistent results
- * we always use this SIZEOF() macro in place of using sizeof() directly.
- */
- #define SIZEOF(object) ((size_t) sizeof(object))
- /*
- * The modules that use fread() and fwrite() always invoke them through
- * these macros. On some systems you may need to twiddle the argument casts.
- * CAUTION: argument order is different from underlying functions!
- */
- #define JFREAD(file,buf,sizeofbuf)
- ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
- #define JFWRITE(file,buf,sizeofbuf)
- ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))