/* $Id: tif_jbig.c,v 1.15 2010-03-10 18:56:48 bfriesen Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
* Copyright (c) 1991-1997 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.
*
* JBIG Compression Algorithm Support.
* Contributed by Lee Howard <faxguy@deanox.com>
*
*/
#include "tiffiop.h"
#ifdef JBIG_SUPPORT
#include "jbig.h"
static int JBIGSetupDecode(TIFF* tif)
{
if (TIFFNumberOfStrips(tif) != 1)
{
TIFFErrorExt(tif->tif_clientdata, "JBIG", "Multistrip images not supported in decoder");
return 0;
}
return 1;
}
static int JBIGDecode(TIFF* tif, uint8* buffer, tmsize_t size, uint16 s)
{
struct jbg_dec_state decoder;
int decodeStatus = 0;
unsigned char* pImage = NULL;
(void) size, (void) s;
if (isFillOrder(tif, tif->tif_dir.td_fillorder))
{
TIFFReverseBits(tif->tif_rawdata, tif->tif_rawdatasize);
}
jbg_dec_init(&decoder);
#if defined(HAVE_JBG_NEWLEN)
jbg_newlen(tif->tif_rawdata, (size_t)tif->tif_rawdatasize);
/*
* I do not check the return status of jbg_newlen because even if this
* function fails it does not necessarily mean that decoding the image
* will fail. It is generally only needed for received fax images
* that do not contain the actual length of the image in the BIE
* header. I do not log when an error occurs because that will cause
* problems when converting JBIG encoded TIFF's to
* PostScript. As long as the actual image length is contained in the
* BIE header jbg_dec_in should succeed.
*/
#endif /* HAVE_JBG_NEWLEN */
decodeStatus = jbg_dec_in(&decoder, (unsigned char*)tif->tif_rawdata,
(size_t)tif->tif_rawdatasize, NULL);
if (JBG_EOK != decodeStatus)
{
/*
* XXX: JBG_EN constant was defined in pre-2.0 releases of the
* JBIG-KIT. Since the 2.0 the error reporting functions were
* changed. We will handle both cases here.
*/
TIFFErrorExt(tif->tif_clientdata,
"JBIG", "Error (%d) decoding: %s",
decodeStatus,
#if defined(JBG_EN)
jbg_strerror(decodeStatus, JBG_EN)
#else
jbg_strerror(decodeStatus)
#endif
);
return 0;
}
pImage = jbg_dec_getimage(&decoder, 0);
_TIFFmemcpy(buffer, pImage, jbg_dec_getsize(&decoder));
jbg_dec_free(&decoder);
return 1;
}
static int JBIGSetupEncode(TIFF* tif)
{
if (TIFFNumberOfStrips(tif) != 1)
{
TIFFErrorExt(tif->tif_clientdata, "JBIG", "Multistrip images not supported in encoder");
return 0;
}
return 1;
}
static int JBIGCopyEncodedData(TIFF* tif, unsigned char* pp, size_t cc, uint16 s)
{
(void) s;
while (cc > 0)
{
tmsize_t n = (tmsize_t)cc;
if (tif->tif_rawcc + n > tif->tif_rawdatasize)
{
n = tif->tif_rawdatasize - tif->tif_rawcc;
}
assert(n > 0);
_TIFFmemcpy(tif->tif_rawcp, pp, n);
tif->tif_rawcp += n;
tif->tif_rawcc += n;
pp += n;
cc -= (size_t)n;
if (tif->tif_rawcc >= tif->tif_rawdatasize &&
!TIFFFlushData1(tif))
{
return (-1);
}
}
return (1);
}
static void JBIGOutputBie(unsigned char* buffer, size_t len, void* userData)
{
TIFF* tif = (TIFF*)userData;
if (isFillOrder(tif, tif->tif_dir.td_fillorder))
{
TIFFReverseBits(buffer, (tmsize_t)len);
}
JBIGCopyEncodedData(tif, buffer, len, 0);
}
static int JBIGEncode(TIFF* tif, uint8* buffer, tmsize_t size, uint16 s)
{
TIFFDirectory* dir = &tif->tif_dir;
struct jbg_enc_state encoder;
(void) size, (void) s;
jbg_enc_init(&encoder,
dir->td_imagewidth,
dir->td_imagelength,
1,
&buffer,
JBIGOutputBie,
tif);
/*
* jbg_enc_out does the "real" encoding. As data is encoded,
* JBIGOutputBie is called, which writes the data to the directory.
*/
jbg_enc_out(&encoder);
jbg_enc_free(&encoder);
return 1;
}
int TIFFInitJBIG(TIFF* tif, int scheme)
{
assert(scheme == COMPRESSION_JBIG);
/*
* These flags are set so the JBIG Codec can control when to reverse
* bits and when not to and to allow the jbig decoder and bit reverser
* to write to memory when necessary.
*/
tif->tif_flags |= TIFF_NOBITREV;
tif->tif_flags &= ~TIFF_MAPPED;
/* Setup the function pointers for encode, decode, and cleanup. */
tif->tif_setupdecode = JBIGSetupDecode;
tif->tif_decodestrip = JBIGDecode;
tif->tif_setupencode = JBIGSetupEncode;
tif->tif_encodestrip = JBIGEncode;
return 1;
}
#endif /* JBIG_SUPPORT */
/* vim: set ts=8 sts=8 sw=8 noet: */
/*
* Local Variables:
* mode: c
* c-basic-offset: 8
* fill-column: 78
* End:
*/