1 /* 2 * jinclude.h 3 * 4 * Copyright (C) 1991-1994, Thomas G. Lane. 5 * Modified 2017 by Guido Vollbeding. 6 * This file is part of the Independent JPEG Group's software. 7 * For conditions of distribution and use, see the accompanying README file. 8 * 9 * This file exists to provide a single place to fix any problems with 10 * including the wrong system include files. (Common problems are taken 11 * care of by the standard jconfig symbols, but on really weird systems 12 * you may have to edit this file.) 13 * 14 * NOTE: this file is NOT intended to be included by applications using the 15 * JPEG library. Most applications need only include jpeglib.h. 16 */ 17 18 19 /* Include auto-config file to find out which system include files we need. */ 20 21 #include "jconfig.h" /* auto configuration options */ 22 #define JCONFIG_INCLUDED /* so that jpeglib.h doesn't do it again */ 23 24 /* 25 * We need the NULL macro and size_t typedef. 26 * On an ANSI-conforming system it is sufficient to include <stddef.h>. 27 * Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to 28 * pull in <sys/types.h> as well. 29 * Note that the core JPEG library does not require <stdio.h>; 30 * only the default error handler and data source/destination modules do. 31 * But we must pull it in because of the references to FILE in jpeglib.h. 32 * You can remove those references if you want to compile without <stdio.h>. 33 */ 34 35 #ifdef HAVE_STDDEF_H 36 #include <stddef.h> 37 #endif 38 39 #ifdef HAVE_STDLIB_H 40 #include <stdlib.h> 41 #endif 42 43 #ifdef NEED_SYS_TYPES_H 44 #include <sys/types.h> 45 #endif 46 47 #include <stdio.h> 48 49 /* 50 * We need memory copying and zeroing functions, plus strncpy(). 51 * ANSI and System V implementations declare these in <string.h>. 52 * BSD doesn't have the mem() functions, but it does have bcopy()/bzero(). 53 * Some systems may declare memset and memcpy in <memory.h>. 54 * 55 * NOTE: we assume the size parameters to these functions are of type size_t. 56 * Change the casts in these macros if not! 57 */ 58 59 #ifdef NEED_BSD_STRINGS 60 61 #include <strings.h> 62 #define MEMZERO(target,size) bzero((void *)(target), (size_t)(size)) 63 #define MEMCOPY(dest,src,size) bcopy((const void *)(src), (void *)(dest), (size_t)(size)) 64 65 #else /* not BSD, assume ANSI/SysV string lib */ 66 67 #include <string.h> 68 #define MEMZERO(target,size) memset((void *)(target), 0, (size_t)(size)) 69 #define MEMCOPY(dest,src,size) memcpy((void *)(dest), (const void *)(src), (size_t)(size)) 70 71 #endif 72 73 /* 74 * In ANSI C, and indeed any rational implementation, size_t is also the 75 * type returned by sizeof(). However, it seems there are some irrational 76 * implementations out there, in which sizeof() returns an int even though 77 * size_t is defined as long or unsigned long. To ensure consistent results 78 * we always use this SIZEOF() macro in place of using sizeof() directly. 79 */ 80 81 #define SIZEOF(object) ((size_t) sizeof(object)) 82 83 /* 84 * The modules that use fread() and fwrite() always invoke them through 85 * these macros. On some systems you may need to twiddle the argument casts. 86 * CAUTION: argument order is different from underlying functions! 87 * 88 * Furthermore, macros are provided for fflush() and ferror() in order 89 * to facilitate adaption by applications using an own FILE class. 90 */ 91 92 #define JFREAD(file,buf,sizeofbuf) \ 93 ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file))) 94 #define JFWRITE(file,buf,sizeofbuf) \ 95 ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file))) 96 #define JFFLUSH(file) fflush(file) 97 #define JFERROR(file) ferror(file) 98