198 lines
5.5 KiB
C
198 lines
5.5 KiB
C
/*
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* jinclude.h
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*
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* Copyright (C) 1991-1994, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file exists to provide a single place to fix any problems with
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* including the wrong system include files. (Common problems are taken
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* care of by the standard jconfig symbols, but on really weird systems
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* you may have to edit this file.)
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*
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* NOTE: this file is NOT intended to be included by applications using the
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* JPEG library. Most applications need only include jpeglib.h.
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*/
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/* Include auto-config file to find out which system include files we need. */
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#ifndef __jinclude_h__
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#define __jinclude_h__
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#include "jconfig.h" /* auto configuration options */
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#define JCONFIG_INCLUDED /* so that jpeglib.h doesn't do it again */
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/*
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* We need the NULL macro and size_t typedef.
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* On an ANSI-conforming system it is sufficient to include <stddef.h>.
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* Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to
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* pull in <sys/types.h> as well.
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* Note that the core JPEG library does not require <stdio.h>;
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* only the default error handler and data source/destination modules do.
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* But we must pull it in because of the references to FILE in jpeglib.h.
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* You can remove those references if you want to compile without <stdio.h>.
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*/
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#ifdef HAVE_STDDEF_H
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#include <stddef.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef NEED_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include <stdio.h>
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/*
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* We need memory copying and zeroing functions, plus strncpy().
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* ANSI and System V implementations declare these in <string.h>.
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* BSD doesn't have the mem() functions, but it does have bcopy()/bzero().
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* Some systems may declare memset and memcpy in <memory.h>.
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*
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* NOTE: we assume the size parameters to these functions are of type size_t.
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* Change the casts in these macros if not!
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*/
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#ifdef NEED_BSD_STRINGS
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#include <strings.h>
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#define MEMZERO(target,size) bzero((void *)(target), (size_t)(size))
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#define MEMCOPY(dest,src,size) bcopy((const void *)(src), (void *)(dest), (size_t)(size))
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#else /* not BSD, assume ANSI/SysV string lib */
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#include <string.h>
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#define MEMZERO(target,size) memset((void *)(target), 0, (size_t)(size))
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#define MEMCOPY(dest,src,size) memcpy((void *)(dest), (const void *)(src), (size_t)(size))
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#endif
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/*
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* In ANSI C, and indeed any rational implementation, size_t is also the
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* type returned by sizeof(). However, it seems there are some irrational
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* implementations out there, in which sizeof() returns an int even though
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* size_t is defined as long or unsigned long. To ensure consistent results
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* we always use this SIZEOF() macro in place of using sizeof() directly.
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*/
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#define SIZEOF(object) ((size_t) sizeof(object))
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/*
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* The modules that use fread() and fwrite() always invoke them through
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* these macros. On some systems you may need to twiddle the argument casts.
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* CAUTION: argument order is different from underlying functions!
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*/
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#define JFREAD(file,buf,sizeofbuf) \
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((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
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#define JFWRITE(file,buf,sizeofbuf) \
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((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
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typedef enum { /* JPEG marker codes */
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M_SOF0 = 0xc0,
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M_SOF1 = 0xc1,
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M_SOF2 = 0xc2,
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M_SOF3 = 0xc3,
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M_SOF5 = 0xc5,
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M_SOF6 = 0xc6,
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M_SOF7 = 0xc7,
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M_JPG = 0xc8,
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M_SOF9 = 0xc9,
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M_SOF10 = 0xca,
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M_SOF11 = 0xcb,
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M_SOF13 = 0xcd,
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M_SOF14 = 0xce,
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M_SOF15 = 0xcf,
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M_DHT = 0xc4,
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M_DAC = 0xcc,
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M_RST0 = 0xd0,
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M_RST1 = 0xd1,
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M_RST2 = 0xd2,
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M_RST3 = 0xd3,
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M_RST4 = 0xd4,
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M_RST5 = 0xd5,
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M_RST6 = 0xd6,
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M_RST7 = 0xd7,
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M_SOI = 0xd8,
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M_EOI = 0xd9,
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M_SOS = 0xda,
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M_DQT = 0xdb,
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M_DNL = 0xdc,
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M_DRI = 0xdd,
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M_DHP = 0xde,
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M_EXP = 0xdf,
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M_APP0 = 0xe0,
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M_APP1 = 0xe1,
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M_APP2 = 0xe2,
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M_APP3 = 0xe3,
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M_APP4 = 0xe4,
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M_APP5 = 0xe5,
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M_APP6 = 0xe6,
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M_APP7 = 0xe7,
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M_APP8 = 0xe8,
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M_APP9 = 0xe9,
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M_APP10 = 0xea,
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M_APP11 = 0xeb,
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M_APP12 = 0xec,
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M_APP13 = 0xed,
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M_APP14 = 0xee,
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M_APP15 = 0xef,
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M_JPG0 = 0xf0,
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M_JPG13 = 0xfd,
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M_COM = 0xfe,
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M_TEM = 0x01,
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M_ERROR = 0x100
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} JPEG_MARKER;
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/*
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* Figure F.12: extend sign bit.
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* On some machines, a shift and add will be faster than a table lookup.
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*/
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#ifdef AVOID_TABLES
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#define HUFF_EXTEND(x,s) ((x) < (1<<((s)-1)) ? (x) + (((-1)<<(s)) + 1) : (x))
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#else
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#define HUFF_EXTEND(x,s) ((x) < extend_test[s] ? (x) + extend_offset[s] : (x))
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static const int extend_test[16] = /* entry n is 2**(n-1) */
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{ 0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
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0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000 };
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#define SHIFTED_BITS_PLUS_ONE(n) (int) (((unsigned int) -1) << n) + 1
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static const int extend_offset[16] = /* entry n is (-1 << n) + 1 */
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{ 0,
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SHIFTED_BITS_PLUS_ONE (1), SHIFTED_BITS_PLUS_ONE (2), SHIFTED_BITS_PLUS_ONE (3), SHIFTED_BITS_PLUS_ONE (4),
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SHIFTED_BITS_PLUS_ONE (5), SHIFTED_BITS_PLUS_ONE (6), SHIFTED_BITS_PLUS_ONE (7), SHIFTED_BITS_PLUS_ONE (8),
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SHIFTED_BITS_PLUS_ONE (9), SHIFTED_BITS_PLUS_ONE (10), SHIFTED_BITS_PLUS_ONE (11), SHIFTED_BITS_PLUS_ONE (12),
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SHIFTED_BITS_PLUS_ONE (13), SHIFTED_BITS_PLUS_ONE (14), SHIFTED_BITS_PLUS_ONE (15) };
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#undef SHIFTED_BITS_PLUS_ONE
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#endif /* AVOID_TABLES */
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#endif
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