[wxWidgets.git] / 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
8414a40c VZ	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: */