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- #ifndef lint
- static char rcsid[] = "$Header: /usr/people/sam/tiff/libtiff/RCS/tif_fax4.c,v 1.14 92/03/11 15:45:17 sam Exp $";
- #endif
-
- /*
- * 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.
- */
-
- /*
- * TIFF Library.
- *
- * CCITT Group 4 Facsimile-compatible
- * Compression Scheme Support.
- */
- #include "tiffioP.h"
- #include "tif_fax3.h"
-
- #if USE_PROTOTYPES
- static int Fax4Decode(TIFF*, u_char *, int, u_int);
- static int Fax4Encode(TIFF*, u_char *, int, u_int);
- static int Fax4PostEncode(TIFF*);
- #else
- static int Fax4Decode();
- static int Fax4Encode();
- static int Fax4PostEncode();
- #endif
-
- TIFFInitCCITTFax4(tif)
- TIFF *tif;
- {
- TIFFInitCCITTFax3(tif); /* reuse G3 compression */
- tif->tif_decoderow = Fax4Decode;
- tif->tif_decodestrip = Fax4Decode;
- tif->tif_decodetile = Fax4Decode;
- tif->tif_encoderow = Fax4Encode;
- tif->tif_encodestrip = Fax4Encode;
- tif->tif_encodetile = Fax4Encode;
- tif->tif_postencode = Fax4PostEncode;
- /*
- * FAX3_NOEOL causes the regular G3 decompression
- * code to not skip to the EOL mark at the end of
- * a row (during normal decoding). FAX3_CLASSF
- * suppresses RTC generation at the end of an image.
- */
- tif->tif_options = FAX3_NOEOL|FAX3_CLASSF;
- return (1);
- }
-
- /*
- * Decode the requested amount of data.
- */
- static int
- Fax4Decode(tif, buf, occ, s)
- TIFF *tif;
- u_char *buf;
- int occ;
- u_int s;
- {
- Fax3BaseState *sp = (Fax3BaseState *)tif->tif_data;
-
- bzero(buf, occ); /* decoding only sets non-zero bits */
- while (occ > 0) {
- if (!Fax3Decode2DRow(tif, buf, sp->rowpixels))
- return (0);
- bcopy(buf, sp->refline, sp->rowbytes);
- buf += sp->rowbytes;
- occ -= sp->rowbytes;
- }
- return (1);
- }
-
- /*
- * Encode the requested amount of data.
- */
- static int
- Fax4Encode(tif, bp, cc, s)
- TIFF *tif;
- u_char *bp;
- int cc;
- u_int s;
- {
- Fax3BaseState *sp = (Fax3BaseState *)tif->tif_data;
-
- while (cc > 0) {
- if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->rowpixels))
- return (0);
- bcopy(bp, sp->refline, sp->rowbytes);
- bp += sp->rowbytes;
- cc -= sp->rowbytes;
- }
- return (1);
- }
-
- static
- Fax4PostEncode(tif)
- TIFF *tif;
- {
- Fax3BaseState *sp = (Fax3BaseState *)tif->tif_data;
-
- /* terminate strip w/ EOFB */
- Fax3PutEOL(tif);
- Fax3PutEOL(tif);
- if (sp->bit != 8)
- Fax3FlushBits(tif, sp);
- return (1);
- }
-