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/* $Header: /usr/people/sam/tiff/libtiff/RCS/tif_fax3.h,v 1.10 92/10/21 08:50:18 sam Exp $ */
/*
* Copyright (c) 1990, 1991, 1992 Sam Leffler
* Copyright (c) 1991, 1992 Silicon Graphics, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the names of
* Sam Leffler and Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Sam Leffler and Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#ifndef _FAX3_
#define _FAX3_
/*
* CCITT Group 3 compression/decompression definitions.
*/
#define FAX3_CLASSF TIFF_OPT0 /* use Class F protocol */
/* the following are for use by Compression=2, 32771, and 4 (T.6) algorithms */
#define FAX3_NOEOL TIFF_OPT1 /* no EOL code at end of row */
#define FAX3_BYTEALIGN TIFF_OPT2 /* force byte alignment at end of row */
#define FAX3_WORDALIGN TIFF_OPT3 /* force word alignment at end of row */
/*
* Compression+decompression state blocks are
* derived from this ``base state'' block.
*/
typedef struct {
short data; /* current i/o byte */
short bit; /* current i/o bit in byte */
short white; /* value of the color ``white'' */
u_long rowbytes; /* XXX maybe should be a long? */
u_long rowpixels; /* XXX maybe should be a long? */
enum { /* decoding/encoding mode */
G3_1D, /* basic 1-d mode */
G3_2D /* optional 2-d mode */
} tag;
#if defined(__STDC__) || defined(__EXTENDED__) || USE_CONST
const u_char *bitmap; /* bit reversal table */
#else
u_char *bitmap; /* bit reversal table */
#endif
u_char *refline; /* reference line for 2d decoding */
} Fax3BaseState;
/* these routines are used by Group 4 (T.6) */
#if USE_PROTOTYPES
extern int Fax3Decode2DRow(TIFF*, u_char*, int);
extern int Fax3Encode2DRow(TIFF*, u_char*, u_char*, int);
extern void Fax3PutBits(TIFF*, u_int, u_int);
extern void Fax3PutEOL(TIFF*);
extern int TIFFInitCCITTFax3(TIFF*);
#else
extern int Fax3Decode2DRow();
extern int Fax3Encode2DRow();
extern void Fax3PutBits();
extern void Fax3PutEOL();
extern int TIFFInitCCITTFax3();
#endif
#define Fax3FlushBits(tif, sp) { \
if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
(void) TIFFFlushData1(tif); \
*(tif)->tif_rawcp++ = (sp)->bitmap[(sp)->data]; \
(tif)->tif_rawcc++; \
(sp)->data = 0; \
(sp)->bit = 8; \
}
#endif /* _FAX3_ */
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