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      1 /*
      2  * jinclude.h
      3  *
      4  * Copyright (C) 1991-1994, Thomas G. Lane.
      5  * This file is part of the Independent JPEG Group's software.
      6  * For conditions of distribution and use, see the accompanying README file.
      7  *
      8  * This file exists to provide a single place to fix any problems with
      9  * including the wrong system include files.  (Common problems are taken
     10  * care of by the standard jconfig symbols, but on really weird systems
     11  * you may have to edit this file.)
     12  *
     13  * NOTE: this file is NOT intended to be included by applications using the
     14  * JPEG library.  Most applications need only include jpeglib.h.
     15  */
     16 
     17 
     18 /* Include auto-config file to find out which system include files we need. */
     19 
     20 #include "jconfig.h"		/* auto configuration options */
     21 #define JCONFIG_INCLUDED	/* so that jpeglib.h doesn't do it again */
     22 
     23 /*
     24  * We need the NULL macro and size_t typedef.
     25  * On an ANSI-conforming system it is sufficient to include <stddef.h>.
     26  * Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to
     27  * pull in <sys/types.h> as well.
     28  * Note that the core JPEG library does not require <stdio.h>;
     29  * only the default error handler and data source/destination modules do.
     30  * But we must pull it in because of the references to FILE in jpeglib.h.
     31  * You can remove those references if you want to compile without <stdio.h>.
     32  */
     33 
     34 #ifdef HAVE_STDDEF_H
     35 #include <stddef.h>
     36 #endif
     37 
     38 #ifdef HAVE_STDLIB_H
     39 #include <stdlib.h>
     40 #endif
     41 
     42 #ifdef NEED_SYS_TYPES_H
     43 #include <sys/types.h>
     44 #endif
     45 
     46 #include <stdio.h>
     47 
     48 /*
     49  * We need memory copying and zeroing functions, plus strncpy().
     50  * ANSI and System V implementations declare these in <string.h>.
     51  * BSD doesn't have the mem() functions, but it does have bcopy()/bzero().
     52  * Some systems may declare memset and memcpy in <memory.h>.
     53  *
     54  * NOTE: we assume the size parameters to these functions are of type size_t.
     55  * Change the casts in these macros if not!
     56  */
     57 
     58 #ifdef NEED_BSD_STRINGS
     59 
     60 #include <strings.h>
     61 #define MEMZERO(target,size)	bzero((void *)(target), (size_t)(size))
     62 #define MEMCOPY(dest,src,size)	bcopy((const void *)(src), (void *)(dest), (size_t)(size))
     63 
     64 #else /* not BSD, assume ANSI/SysV string lib */
     65 
     66 #include <string.h>
     67 #define MEMZERO(target,size)	memset((void *)(target), 0, (size_t)(size))
     68 #define MEMCOPY(dest,src,size)	memcpy((void *)(dest), (const void *)(src), (size_t)(size))
     69 
     70 #endif
     71 
     72 /*
     73  * In ANSI C, and indeed any rational implementation, size_t is also the
     74  * type returned by sizeof().  However, it seems there are some irrational
     75  * implementations out there, in which sizeof() returns an int even though
     76  * size_t is defined as long or unsigned long.  To ensure consistent results
     77  * we always use this SIZEOF() macro in place of using sizeof() directly.
     78  */
     79 
     80 #define SIZEOF(object)	((size_t) sizeof(object))
     81 
     82 /*
     83  * The modules that use fread() and fwrite() always invoke them through
     84  * these macros.  On some systems you may need to twiddle the argument casts.
     85  * CAUTION: argument order is different from underlying functions!
     86  */
     87 
     88 #define JFREAD(file,buf,sizeofbuf)  \
     89   ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
     90 #define JFWRITE(file,buf,sizeofbuf)  \
     91   ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
     92