/* $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></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:

 */