src/tiff/libtiff/tif_zip.c

/* $Id$ */

/*
 * Copyright (c) 1995-1997 Sam Leffler
 * Copyright (c) 1995-1997 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.
 */

#include "tiffiop.h"
#ifdef ZIP_SUPPORT
/*
 * TIFF Library.
 *
 * ZIP (aka Deflate) Compression Support
 *
 * This file is simply an interface to the zlib library written by
 * Jean-loup Gailly and Mark Adler.  You must use version 1.0 or later
 * of the library: this code assumes the 1.0 API and also depends on
 * the ability to write the zlib header multiple times (one per strip)
 * which was not possible with versions prior to 0.95.  Note also that
 * older versions of this codec avoided this bug by supressing the header
 * entirely.  This means that files written with the old library cannot
 * be read; they should be converted to a different compression scheme
 * and then reconverted.
 *
 * The data format used by the zlib library is described in the files
 * zlib-3.1.doc, deflate-1.1.doc and gzip-4.1.doc, available in the
 * directory ftp://ftp.uu.net/pub/archiving/zip/doc.  The library was
 * last found at ftp://ftp.uu.net/pub/archiving/zip/zlib/zlib-0.99.tar.gz.
 */
#include "tif_predict.h"
#include "zlib.h"

#include <stdio.h>

/*
 * Sigh, ZLIB_VERSION is defined as a string so there's no
 * way to do a proper check here.  Instead we guess based
 * on the presence of #defines that were added between the
 * 0.95 and 1.0 distributions.
 */
#if !defined(Z_NO_COMPRESSION) || !defined(Z_DEFLATED)
#error "Antiquated ZLIB software; you must use version 1.0 or later"
#endif

/*
 * State block for each open TIFF
 * file using ZIP compression/decompression.
 */
typedef	struct {
	TIFFPredictorState predict;
	z_stream	stream;
	int		zipquality;		/* compression level */
	int		state;			/* state flags */
#define	ZSTATE_INIT	0x1		/* zlib setup successfully */

	TIFFVGetMethod	vgetparent;		/* super-class method */
	TIFFVSetMethod	vsetparent;		/* super-class method */
} ZIPState;

#define	ZState(tif)		((ZIPState*) (tif)->tif_data)
#define	DecoderState(tif)	ZState(tif)
#define	EncoderState(tif)	ZState(tif)

static	int ZIPEncode(TIFF*, tidata_t, tsize_t, tsample_t);
static	int ZIPDecode(TIFF*, tidata_t, tsize_t, tsample_t);

static int
ZIPSetupDecode(TIFF* tif)
{
	ZIPState* sp = DecoderState(tif);
	static const char module[] = "ZIPSetupDecode";

	assert(sp != NULL);
	if (inflateInit(&sp->stream) != Z_OK) {
		TIFFErrorExt(tif->tif_clientdata, module, "%s: %s", tif->tif_name, sp->stream.msg);
		return (0);
	} else {
		sp->state |= ZSTATE_INIT;
		return (1);
	}
}

/*
 * Setup state for decoding a strip.
 */
static int
ZIPPreDecode(TIFF* tif, tsample_t s)
{
	ZIPState* sp = DecoderState(tif);

	(void) s;
	assert(sp != NULL);
	sp->stream.next_in = tif->tif_rawdata;
	sp->stream.avail_in = tif->tif_rawcc;
	return (inflateReset(&sp->stream) == Z_OK);
}

static int
ZIPDecode(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
{
	ZIPState* sp = DecoderState(tif);
	static const char module[] = "ZIPDecode";

	(void) s;
	assert(sp != NULL);
	sp->stream.next_out = op;
	sp->stream.avail_out = occ;
	do {
		int state = inflate(&sp->stream, Z_PARTIAL_FLUSH);
		if (state == Z_STREAM_END)
			break;
		if (state == Z_DATA_ERROR) {
			TIFFErrorExt(tif->tif_clientdata, module,
			    "%s: Decoding error at scanline %d, %s",
			    tif->tif_name, tif->tif_row, sp->stream.msg);
			if (inflateSync(&sp->stream) != Z_OK)
				return (0);
			continue;
		}
		if (state != Z_OK) {
			TIFFErrorExt(tif->tif_clientdata, module, "%s: zlib error: %s",
			    tif->tif_name, sp->stream.msg);
			return (0);
		}
	} while (sp->stream.avail_out > 0);
	if (sp->stream.avail_out != 0) {
		TIFFErrorExt(tif->tif_clientdata, module,
		    "%s: Not enough data at scanline %d (short %d bytes)",
		    tif->tif_name, tif->tif_row, sp->stream.avail_out);
		return (0);
	}
	return (1);
}

static int
ZIPSetupEncode(TIFF* tif)
{
	ZIPState* sp = EncoderState(tif);
	static const char module[] = "ZIPSetupEncode";

	assert(sp != NULL);
	if (deflateInit(&sp->stream, sp->zipquality) != Z_OK) {
		TIFFErrorExt(tif->tif_clientdata, module, "%s: %s", tif->tif_name, sp->stream.msg);
		return (0);
	} else {
		sp->state |= ZSTATE_INIT;
		return (1);
	}
}

/*
 * Reset encoding state at the start of a strip.
 */
static int
ZIPPreEncode(TIFF* tif, tsample_t s)
{
	ZIPState *sp = EncoderState(tif);

	(void) s;
	assert(sp != NULL);
	sp->stream.next_out = tif->tif_rawdata;
	sp->stream.avail_out = tif->tif_rawdatasize;
	return (deflateReset(&sp->stream) == Z_OK);
}

/*
 * Encode a chunk of pixels.
 */
static int
ZIPEncode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
{
	ZIPState *sp = EncoderState(tif);
	static const char module[] = "ZIPEncode";

	(void) s;
	sp->stream.next_in = bp;
	sp->stream.avail_in = cc;
	do {
		if (deflate(&sp->stream, Z_NO_FLUSH) != Z_OK) {
			TIFFErrorExt(tif->tif_clientdata, module, "%s: Encoder error: %s",
			    tif->tif_name, sp->stream.msg);
			return (0);
		}
		if (sp->stream.avail_out == 0) {
			tif->tif_rawcc = tif->tif_rawdatasize;
			TIFFFlushData1(tif);
			sp->stream.next_out = tif->tif_rawdata;
			sp->stream.avail_out = tif->tif_rawdatasize;
		}
	} while (sp->stream.avail_in > 0);
	return (1);
}

/*
 * Finish off an encoded strip by flushing the last
 * string and tacking on an End Of Information code.
 */
static int
ZIPPostEncode(TIFF* tif)
{
	ZIPState *sp = EncoderState(tif);
	static const char module[] = "ZIPPostEncode";
	int state;

	sp->stream.avail_in = 0;
	do {
		state = deflate(&sp->stream, Z_FINISH);
		switch (state) {
		case Z_STREAM_END:
		case Z_OK:
		    if ((int)sp->stream.avail_out != (int)tif->tif_rawdatasize)
                    {
			    tif->tif_rawcc =
				tif->tif_rawdatasize - sp->stream.avail_out;
			    TIFFFlushData1(tif);
			    sp->stream.next_out = tif->tif_rawdata;
			    sp->stream.avail_out = tif->tif_rawdatasize;
		    }
		    break;
		default:
			TIFFErrorExt(tif->tif_clientdata, module, "%s: zlib error: %s",
			tif->tif_name, sp->stream.msg);
		    return (0);
		}
	} while (state != Z_STREAM_END);
	return (1);
}

static void
ZIPCleanup(TIFF* tif)
{
	ZIPState* sp = ZState(tif);

	assert(sp != 0);

	(void)TIFFPredictorCleanup(tif);

	tif->tif_tagmethods.vgetfield = sp->vgetparent;
	tif->tif_tagmethods.vsetfield = sp->vsetparent;

	if (sp->state&ZSTATE_INIT) {
		/* NB: avoid problems in the library */
		if (tif->tif_mode == O_RDONLY)
			inflateEnd(&sp->stream);
		else
			deflateEnd(&sp->stream);
	}
	_TIFFfree(sp);
	tif->tif_data = NULL;

	_TIFFSetDefaultCompressionState(tif);
}

static int
ZIPVSetField(TIFF* tif, ttag_t tag, va_list ap)
{
	ZIPState* sp = ZState(tif);
	static const char module[] = "ZIPVSetField";

	switch (tag) {
	case TIFFTAG_ZIPQUALITY:
		sp->zipquality = va_arg(ap, int);
		if (tif->tif_mode != O_RDONLY && (sp->state&ZSTATE_INIT)) {
			if (deflateParams(&sp->stream,
			    sp->zipquality, Z_DEFAULT_STRATEGY) != Z_OK) {
				TIFFErrorExt(tif->tif_clientdata, module, "%s: zlib error: %s",
				    tif->tif_name, sp->stream.msg);
				return (0);
			}
		}
		return (1);
	default:
		return (*sp->vsetparent)(tif, tag, ap);
	}
	/*NOTREACHED*/
}

static int
ZIPVGetField(TIFF* tif, ttag_t tag, va_list ap)
{
	ZIPState* sp = ZState(tif);

	switch (tag) {
	case TIFFTAG_ZIPQUALITY:
		*va_arg(ap, int*) = sp->zipquality;
		break;
	default:
		return (*sp->vgetparent)(tif, tag, ap);
	}
	return (1);
}

static const TIFFFieldInfo zipFieldInfo[] = {
    { TIFFTAG_ZIPQUALITY,	 0, 0,	TIFF_ANY,	FIELD_PSEUDO,
      TRUE,	FALSE,	"" },
};

int
TIFFInitZIP(TIFF* tif, int scheme)
{
	ZIPState* sp;

	assert( (scheme == COMPRESSION_DEFLATE)
		|| (scheme == COMPRESSION_ADOBE_DEFLATE));

	/*
	 * Allocate state block so tag methods have storage to record values.
	 */
	tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (ZIPState));
	if (tif->tif_data == NULL)
		goto bad;
	sp = ZState(tif);
	sp->stream.zalloc = NULL;
	sp->stream.zfree = NULL;
	sp->stream.opaque = NULL;
	sp->stream.data_type = Z_BINARY;

	/*
	 * Merge codec-specific tag information and
	 * override parent get/set field methods.
	 */
	_TIFFMergeFieldInfo(tif, zipFieldInfo, TIFFArrayCount(zipFieldInfo));
	sp->vgetparent = tif->tif_tagmethods.vgetfield;
	tif->tif_tagmethods.vgetfield = ZIPVGetField; /* hook for codec tags */
	sp->vsetparent = tif->tif_tagmethods.vsetfield;
	tif->tif_tagmethods.vsetfield = ZIPVSetField; /* hook for codec tags */

	/* Default values for codec-specific fields */
	sp->zipquality = Z_DEFAULT_COMPRESSION;	/* default comp. level */
	sp->state = 0;

	/*
	 * Install codec methods.
	 */
	tif->tif_setupdecode = ZIPSetupDecode;
	tif->tif_predecode = ZIPPreDecode;
	tif->tif_decoderow = ZIPDecode;
	tif->tif_decodestrip = ZIPDecode;
	tif->tif_decodetile = ZIPDecode;
	tif->tif_setupencode = ZIPSetupEncode;
	tif->tif_preencode = ZIPPreEncode;
	tif->tif_postencode = ZIPPostEncode;
	tif->tif_encoderow = ZIPEncode;
	tif->tif_encodestrip = ZIPEncode;
	tif->tif_encodetile = ZIPEncode;
	tif->tif_cleanup = ZIPCleanup;
	/*
	 * Setup predictor setup.
	 */
	(void) TIFFPredictorInit(tif);
	return (1);
bad:
	TIFFErrorExt(tif->tif_clientdata, "TIFFInitZIP",
		     "No space for ZIP state block");
	return (0);
}
#endif /* ZIP_SUPORT */

/* vim: set ts=8 sts=8 sw=8 noet: */
Commit	Line	Data
	1	/* $Id$ */
	2
	3	/*
	4	* Copyright (c) 1995-1997 Sam Leffler
	5	* Copyright (c) 1995-1997 Silicon Graphics, Inc.
	6	*
	7	* Permission to use, copy, modify, distribute, and sell this software and
	8	* its documentation for any purpose is hereby granted without fee, provided
	9	* that (i) the above copyright notices and this permission notice appear in
	10	* all copies of the software and related documentation, and (ii) the names of
	11	* Sam Leffler and Silicon Graphics may not be used in any advertising or
	12	* publicity relating to the software without the specific, prior written
	13	* permission of Sam Leffler and Silicon Graphics.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	16	* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	17	* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	18	*
	19	* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	20	* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	21	* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	22	* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	23	* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	24	* OF THIS SOFTWARE.
	25	*/
	26
	27	#include "tiffiop.h"
	28	#ifdef ZIP_SUPPORT
	29	/*
	30	* TIFF Library.
	31	*
	32	* ZIP (aka Deflate) Compression Support
	33	*
	34	* This file is simply an interface to the zlib library written by
	35	* Jean-loup Gailly and Mark Adler. You must use version 1.0 or later
	36	* of the library: this code assumes the 1.0 API and also depends on
	37	* the ability to write the zlib header multiple times (one per strip)
	38	* which was not possible with versions prior to 0.95. Note also that
	39	* older versions of this codec avoided this bug by supressing the header
	40	* entirely. This means that files written with the old library cannot
	41	* be read; they should be converted to a different compression scheme
	42	* and then reconverted.
	43	*
	44	* The data format used by the zlib library is described in the files
	45	* zlib-3.1.doc, deflate-1.1.doc and gzip-4.1.doc, available in the
	46	* directory ftp://ftp.uu.net/pub/archiving/zip/doc. The library was
	47	* last found at ftp://ftp.uu.net/pub/archiving/zip/zlib/zlib-0.99.tar.gz.
	48	*/
	49	#include "tif_predict.h"
	50	#include "zlib.h"
	51
	52	#include <stdio.h>
	53
	54	/*
	55	* Sigh, ZLIB_VERSION is defined as a string so there's no
	56	* way to do a proper check here. Instead we guess based
	57	* on the presence of #defines that were added between the
	58	* 0.95 and 1.0 distributions.
	59	*/
	60	#if !defined(Z_NO_COMPRESSION) \|\| !defined(Z_DEFLATED)
	61	#error "Antiquated ZLIB software; you must use version 1.0 or later"
	62	#endif
	63
	64	/*
	65	* State block for each open TIFF
	66	* file using ZIP compression/decompression.
	67	*/
	68	typedef struct {
	69	TIFFPredictorState predict;
	70	z_stream stream;
	71	int zipquality; /* compression level */
	72	int state; /* state flags */
	73	#define ZSTATE_INIT 0x1 /* zlib setup successfully */
	74
	75	TIFFVGetMethod vgetparent; /* super-class method */
	76	TIFFVSetMethod vsetparent; /* super-class method */
	77	} ZIPState;
	78
	79	#define ZState(tif) ((ZIPState*) (tif)->tif_data)
	80	#define DecoderState(tif) ZState(tif)
	81	#define EncoderState(tif) ZState(tif)
	82
	83	static int ZIPEncode(TIFF*, tidata_t, tsize_t, tsample_t);
	84	static int ZIPDecode(TIFF*, tidata_t, tsize_t, tsample_t);
	85
	86	static int
	87	ZIPSetupDecode(TIFF* tif)
	88	{
	89	ZIPState* sp = DecoderState(tif);
	90	static const char module[] = "ZIPSetupDecode";
	91
	92	assert(sp != NULL);
	93	if (inflateInit(&sp->stream) != Z_OK) {
	94	TIFFErrorExt(tif->tif_clientdata, module, "%s: %s", tif->tif_name, sp->stream.msg);
	95	return (0);
	96	} else {
	97	sp->state \|= ZSTATE_INIT;
	98	return (1);
	99	}
	100	}
	101
	102	/*
	103	* Setup state for decoding a strip.
	104	*/
	105	static int
	106	ZIPPreDecode(TIFF* tif, tsample_t s)
	107	{
	108	ZIPState* sp = DecoderState(tif);
	109
	110	(void) s;
	111	assert(sp != NULL);
	112	sp->stream.next_in = tif->tif_rawdata;
	113	sp->stream.avail_in = tif->tif_rawcc;
	114	return (inflateReset(&sp->stream) == Z_OK);
	115	}
	116
	117	static int
	118	ZIPDecode(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
	119	{
	120	ZIPState* sp = DecoderState(tif);
	121	static const char module[] = "ZIPDecode";
	122
	123	(void) s;
	124	assert(sp != NULL);
	125	sp->stream.next_out = op;
	126	sp->stream.avail_out = occ;
	127	do {
	128	int state = inflate(&sp->stream, Z_PARTIAL_FLUSH);
	129	if (state == Z_STREAM_END)
	130	break;
	131	if (state == Z_DATA_ERROR) {
	132	TIFFErrorExt(tif->tif_clientdata, module,
	133	"%s: Decoding error at scanline %d, %s",
	134	tif->tif_name, tif->tif_row, sp->stream.msg);
	135	if (inflateSync(&sp->stream) != Z_OK)
	136	return (0);
	137	continue;
	138	}
	139	if (state != Z_OK) {
	140	TIFFErrorExt(tif->tif_clientdata, module, "%s: zlib error: %s",
	141	tif->tif_name, sp->stream.msg);
	142	return (0);
	143	}
	144	} while (sp->stream.avail_out > 0);
	145	if (sp->stream.avail_out != 0) {
	146	TIFFErrorExt(tif->tif_clientdata, module,
	147	"%s: Not enough data at scanline %d (short %d bytes)",
	148	tif->tif_name, tif->tif_row, sp->stream.avail_out);
	149	return (0);
	150	}
	151	return (1);
	152	}
	153
	154	static int
	155	ZIPSetupEncode(TIFF* tif)
	156	{
	157	ZIPState* sp = EncoderState(tif);
	158	static const char module[] = "ZIPSetupEncode";
	159
	160	assert(sp != NULL);
	161	if (deflateInit(&sp->stream, sp->zipquality) != Z_OK) {
	162	TIFFErrorExt(tif->tif_clientdata, module, "%s: %s", tif->tif_name, sp->stream.msg);
	163	return (0);
	164	} else {
	165	sp->state \|= ZSTATE_INIT;
	166	return (1);
	167	}
	168	}
	169
	170	/*
	171	* Reset encoding state at the start of a strip.
	172	*/
	173	static int
	174	ZIPPreEncode(TIFF* tif, tsample_t s)
	175	{
	176	ZIPState *sp = EncoderState(tif);
	177
	178	(void) s;
	179	assert(sp != NULL);
	180	sp->stream.next_out = tif->tif_rawdata;
	181	sp->stream.avail_out = tif->tif_rawdatasize;
	182	return (deflateReset(&sp->stream) == Z_OK);
	183	}
	184
	185	/*
	186	* Encode a chunk of pixels.
	187	*/
	188	static int
	189	ZIPEncode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
	190	{
	191	ZIPState *sp = EncoderState(tif);
	192	static const char module[] = "ZIPEncode";
	193
	194	(void) s;
	195	sp->stream.next_in = bp;
	196	sp->stream.avail_in = cc;
	197	do {
	198	if (deflate(&sp->stream, Z_NO_FLUSH) != Z_OK) {
	199	TIFFErrorExt(tif->tif_clientdata, module, "%s: Encoder error: %s",
	200	tif->tif_name, sp->stream.msg);
	201	return (0);
	202	}
	203	if (sp->stream.avail_out == 0) {
	204	tif->tif_rawcc = tif->tif_rawdatasize;
	205	TIFFFlushData1(tif);
	206	sp->stream.next_out = tif->tif_rawdata;
	207	sp->stream.avail_out = tif->tif_rawdatasize;
	208	}
	209	} while (sp->stream.avail_in > 0);
	210	return (1);
	211	}
	212
	213	/*
	214	* Finish off an encoded strip by flushing the last
	215	* string and tacking on an End Of Information code.
	216	*/
	217	static int
	218	ZIPPostEncode(TIFF* tif)
	219	{
	220	ZIPState *sp = EncoderState(tif);
	221	static const char module[] = "ZIPPostEncode";
	222	int state;
	223
	224	sp->stream.avail_in = 0;
	225	do {
	226	state = deflate(&sp->stream, Z_FINISH);
	227	switch (state) {
	228	case Z_STREAM_END:
	229	case Z_OK:
	230	if ((int)sp->stream.avail_out != (int)tif->tif_rawdatasize)
	231	{
	232	tif->tif_rawcc =
	233	tif->tif_rawdatasize - sp->stream.avail_out;
	234	TIFFFlushData1(tif);
	235	sp->stream.next_out = tif->tif_rawdata;
	236	sp->stream.avail_out = tif->tif_rawdatasize;
	237	}
	238	break;
	239	default:
	240	TIFFErrorExt(tif->tif_clientdata, module, "%s: zlib error: %s",
	241	tif->tif_name, sp->stream.msg);
	242	return (0);
	243	}
	244	} while (state != Z_STREAM_END);
	245	return (1);
	246	}
	247
	248	static void
	249	ZIPCleanup(TIFF* tif)
	250	{
	251	ZIPState* sp = ZState(tif);
	252
	253	assert(sp != 0);
	254
	255	(void)TIFFPredictorCleanup(tif);
	256
	257	tif->tif_tagmethods.vgetfield = sp->vgetparent;
	258	tif->tif_tagmethods.vsetfield = sp->vsetparent;
	259
	260	if (sp->state&ZSTATE_INIT) {
	261	/* NB: avoid problems in the library */
	262	if (tif->tif_mode == O_RDONLY)
	263	inflateEnd(&sp->stream);
	264	else
	265	deflateEnd(&sp->stream);
	266	}
	267	_TIFFfree(sp);
	268	tif->tif_data = NULL;
	269
	270	_TIFFSetDefaultCompressionState(tif);
	271	}
	272
	273	static int
	274	ZIPVSetField(TIFF* tif, ttag_t tag, va_list ap)
	275	{
	276	ZIPState* sp = ZState(tif);
	277	static const char module[] = "ZIPVSetField";
	278
	279	switch (tag) {
	280	case TIFFTAG_ZIPQUALITY:
	281	sp->zipquality = va_arg(ap, int);
	282	if (tif->tif_mode != O_RDONLY && (sp->state&ZSTATE_INIT)) {
	283	if (deflateParams(&sp->stream,
	284	sp->zipquality, Z_DEFAULT_STRATEGY) != Z_OK) {
	285	TIFFErrorExt(tif->tif_clientdata, module, "%s: zlib error: %s",
	286	tif->tif_name, sp->stream.msg);
	287	return (0);
	288	}
	289	}
	290	return (1);
	291	default:
	292	return (*sp->vsetparent)(tif, tag, ap);
	293	}
	294	/NOTREACHED/
	295	}
	296
	297	static int
	298	ZIPVGetField(TIFF* tif, ttag_t tag, va_list ap)
	299	{
	300	ZIPState* sp = ZState(tif);
	301
	302	switch (tag) {
	303	case TIFFTAG_ZIPQUALITY:
	304	va_arg(ap, int) = sp->zipquality;
	305	break;
	306	default:
	307	return (*sp->vgetparent)(tif, tag, ap);
	308	}
	309	return (1);
	310	}
	311
	312	static const TIFFFieldInfo zipFieldInfo[] = {
	313	{ TIFFTAG_ZIPQUALITY, 0, 0, TIFF_ANY, FIELD_PSEUDO,
	314	TRUE, FALSE, "" },
	315	};
	316
	317	int
	318	TIFFInitZIP(TIFF* tif, int scheme)
	319	{
	320	ZIPState* sp;
	321
	322	assert( (scheme == COMPRESSION_DEFLATE)
	323	\|\| (scheme == COMPRESSION_ADOBE_DEFLATE));
	324
	325	/*
	326	* Allocate state block so tag methods have storage to record values.
	327	*/
	328	tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (ZIPState));
	329	if (tif->tif_data == NULL)
	330	goto bad;
	331	sp = ZState(tif);
	332	sp->stream.zalloc = NULL;
	333	sp->stream.zfree = NULL;
	334	sp->stream.opaque = NULL;
	335	sp->stream.data_type = Z_BINARY;
	336
	337	/*
	338	* Merge codec-specific tag information and
	339	* override parent get/set field methods.
	340	*/
	341	_TIFFMergeFieldInfo(tif, zipFieldInfo, TIFFArrayCount(zipFieldInfo));
	342	sp->vgetparent = tif->tif_tagmethods.vgetfield;
	343	tif->tif_tagmethods.vgetfield = ZIPVGetField; /* hook for codec tags */
	344	sp->vsetparent = tif->tif_tagmethods.vsetfield;
	345	tif->tif_tagmethods.vsetfield = ZIPVSetField; /* hook for codec tags */
	346
	347	/* Default values for codec-specific fields */
	348	sp->zipquality = Z_DEFAULT_COMPRESSION; /* default comp. level */
	349	sp->state = 0;
	350
	351	/*
	352	* Install codec methods.
	353	*/
	354	tif->tif_setupdecode = ZIPSetupDecode;
	355	tif->tif_predecode = ZIPPreDecode;
	356	tif->tif_decoderow = ZIPDecode;
	357	tif->tif_decodestrip = ZIPDecode;
	358	tif->tif_decodetile = ZIPDecode;
	359	tif->tif_setupencode = ZIPSetupEncode;
	360	tif->tif_preencode = ZIPPreEncode;
	361	tif->tif_postencode = ZIPPostEncode;
	362	tif->tif_encoderow = ZIPEncode;
	363	tif->tif_encodestrip = ZIPEncode;
	364	tif->tif_encodetile = ZIPEncode;
	365	tif->tif_cleanup = ZIPCleanup;
	366	/*
	367	* Setup predictor setup.
	368	*/
	369	(void) TIFFPredictorInit(tif);
	370	return (1);
	371	bad:
	372	TIFFErrorExt(tif->tif_clientdata, "TIFFInitZIP",
	373	"No space for ZIP state block");
	374	return (0);
	375	}
	376	#endif /* ZIP_SUPORT */
	377
	378	/* vim: set ts=8 sts=8 sw=8 noet: */