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#ifndef lint
static char rcsid[] = "$Header: /usr/people/sam/tiff/libtiff/RCS/tif_fax4.c,v 1.22 93/08/25 09:26:59 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"
#include "t4.h"
/*
* Decode the requested amount of data.
*/
static int
Fax4Decode(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
{
Fax3BaseState *sp = (Fax3BaseState *)tif->tif_data;
int status;
memset(buf, 0, occ); /* decoding only sets non-zero bits */
while ((long)occ > 0) {
status = Fax3Decode2DRow(tif, buf, sp->rowpixels);
if (status < 0)
return (status == G3CODE_EOF);
memcpy(sp->refline, buf, sp->rowbytes);
buf += sp->rowbytes;
occ -= sp->rowbytes;
if (occ != 0)
tif->tif_row++;
}
return (1);
}
/*
* Encode the requested amount of data.
*/
static int
Fax4Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
{
Fax3BaseState *sp = (Fax3BaseState *)tif->tif_data;
while ((long)cc > 0) {
if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->rowpixels))
return (0);
memcpy(sp->refline, bp, sp->rowbytes);
bp += sp->rowbytes;
cc -= sp->rowbytes;
if (cc != 0)
tif->tif_row++;
}
return (1);
}
static
Fax4PostEncode(TIFF* tif)
{
Fax3BaseState *sp = (Fax3BaseState *)tif->tif_data;
/* terminate strip w/ EOFB */
Fax3PutBits(tif, EOL, 12);
Fax3PutBits(tif, EOL, 12);
if (sp->bit != 8)
Fax3FlushBits(tif, sp);
return (1);
}
int
TIFFInitCCITTFax4(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);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.