[wxWidgets.git] / src / tiff / libtiff / tif_lzma.c


/*
 * Copyright (c) 2010, Andrey Kiselev <dron@ak4719.spb.edu>
 *
 * 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 LZMA_SUPPORT
/*
 * TIFF Library.
 *
 * LZMA2 Compression Support
 *
 * You need an LZMA2 SDK to link with. See http://tukaani.org/xz/ for details.
 *
 * The codec is derived from ZLIB codec (tif_zip.c).
 */

#include "tif_predict.h"
#include "lzma.h"

#include <stdio.h>

/*
 * State block for each open TIFF file using LZMA2 compression/decompression.
 */
typedef struct {
	TIFFPredictorState predict;
        lzma_stream	stream;
	lzma_filter	filters[LZMA_FILTERS_MAX + 1];
	lzma_options_delta opt_delta;		/* delta filter options */
	lzma_options_lzma opt_lzma;		/* LZMA2 filter options */
	int             preset;			/* compression level */
	lzma_check	check;			/* type of the integrity check */
	int             state;			/* state flags */
#define LSTATE_INIT_DECODE 0x01
#define LSTATE_INIT_ENCODE 0x02

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

#define LState(tif)             ((LZMAState*) (tif)->tif_data)
#define DecoderState(tif)       LState(tif)
#define EncoderState(tif)       LState(tif)

static int LZMAEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s);
static int LZMADecode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s);

static const char *
LZMAStrerror(lzma_ret ret)
{
	switch (ret) {
		case LZMA_OK:
		    return "operation completed successfully";
		case LZMA_STREAM_END:
		    return "end of stream was reached";
		case LZMA_NO_CHECK:
		    return "input stream has no integrity check";
		case LZMA_UNSUPPORTED_CHECK:
		    return "cannot calculate the integrity check";
		case LZMA_GET_CHECK:
		    return "integrity check type is now available";
		case LZMA_MEM_ERROR:
		    return "cannot allocate memory";
		case LZMA_MEMLIMIT_ERROR:
		    return "memory usage limit was reached";
		case LZMA_FORMAT_ERROR:
		    return "file format not recognized";
		case LZMA_OPTIONS_ERROR:
		    return "invalid or unsupported options";
		case LZMA_DATA_ERROR:
		    return "data is corrupt";
		case LZMA_BUF_ERROR:
		    return "no progress is possible (stream is truncated or corrupt)";
		case LZMA_PROG_ERROR:
		    return "programming error";
		default:
		    return "unindentified liblzma error";
	}
}

static int
LZMAFixupTags(TIFF* tif)
{
	(void) tif;
	return 1;
}

static int
LZMASetupDecode(TIFF* tif)
{
	LZMAState* sp = DecoderState(tif);

	assert(sp != NULL);
        
        /* if we were last encoding, terminate this mode */
	if (sp->state & LSTATE_INIT_ENCODE) {
	    lzma_end(&sp->stream);
	    sp->state = 0;
	}

	sp->state |= LSTATE_INIT_DECODE;
	return 1;
}

/*
 * Setup state for decoding a strip.
 */
static int
LZMAPreDecode(TIFF* tif, uint16 s)
{
	static const char module[] = "LZMAPreDecode";
	LZMAState* sp = DecoderState(tif);
	lzma_ret ret;

	(void) s;
	assert(sp != NULL);

	if( (sp->state & LSTATE_INIT_DECODE) == 0 )
            tif->tif_setupdecode(tif);

	sp->stream.next_in = tif->tif_rawdata;
	sp->stream.avail_in = (size_t) tif->tif_rawcc;
	if ((tmsize_t)sp->stream.avail_in != tif->tif_rawcc) {
		TIFFErrorExt(tif->tif_clientdata, module,
			     "Liblzma cannot deal with buffers this size");
		return 0;
	}

	/*
	 * Disable memory limit when decoding. UINT64_MAX is a flag to disable
	 * the limit, we are passing (uint64_t)-1 which should be the same.
	 */
	ret = lzma_stream_decoder(&sp->stream, (uint64_t)-1, 0);
	if (ret != LZMA_OK) {
		TIFFErrorExt(tif->tif_clientdata, module,
			     "Error initializing the stream decoder, %s",
			     LZMAStrerror(ret));
		return 0;
	}
	return 1;
}

static int
LZMADecode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
{
	static const char module[] = "LZMADecode";
	LZMAState* sp = DecoderState(tif);

	(void) s;
	assert(sp != NULL);
	assert(sp->state == LSTATE_INIT_DECODE);

        sp->stream.next_in = tif->tif_rawcp;
        sp->stream.avail_in = (size_t) tif->tif_rawcc;

	sp->stream.next_out = op;
	sp->stream.avail_out = (size_t) occ;
	if ((tmsize_t)sp->stream.avail_out != occ) {
		TIFFErrorExt(tif->tif_clientdata, module,
			     "Liblzma cannot deal with buffers this size");
		return 0;
	}

	do {
		/*
		 * Save the current stream state to properly recover from the
		 * decoding errors later.
		 */
		const uint8_t *next_in = sp->stream.next_in;
		size_t avail_in = sp->stream.avail_in;

		lzma_ret ret = lzma_code(&sp->stream, LZMA_RUN);
		if (ret == LZMA_STREAM_END)
			break;
		if (ret == LZMA_MEMLIMIT_ERROR) {
			lzma_ret r = lzma_stream_decoder(&sp->stream,
							 lzma_memusage(&sp->stream), 0);
			if (r != LZMA_OK) {
				TIFFErrorExt(tif->tif_clientdata, module,
					     "Error initializing the stream decoder, %s",
					     LZMAStrerror(r));
				break;
			}
			sp->stream.next_in = next_in;
			sp->stream.avail_in = avail_in;
			continue;
		}
		if (ret != LZMA_OK) {
			TIFFErrorExt(tif->tif_clientdata, module,
			    "Decoding error at scanline %lu, %s",
			    (unsigned long) tif->tif_row, LZMAStrerror(ret));
			break;
		}
	} while (sp->stream.avail_out > 0);
	if (sp->stream.avail_out != 0) {
		TIFFErrorExt(tif->tif_clientdata, module,
		    "Not enough data at scanline %lu (short %lu bytes)",
		    (unsigned long) tif->tif_row, (unsigned long) sp->stream.avail_out);
		return 0;
	}

        tif->tif_rawcp = (uint8 *)sp->stream.next_in; /* cast away const */
        tif->tif_rawcc = sp->stream.avail_in;
        
	return 1;
}

static int
LZMASetupEncode(TIFF* tif)
{
	LZMAState* sp = EncoderState(tif);

	assert(sp != NULL);
	if (sp->state & LSTATE_INIT_DECODE) {
		lzma_end(&sp->stream);
		sp->state = 0;
	}

	sp->state |= LSTATE_INIT_ENCODE;
	return 1;
}

/*
 * Reset encoding state at the start of a strip.
 */
static int
LZMAPreEncode(TIFF* tif, uint16 s)
{
	static const char module[] = "LZMAPreEncode";
	LZMAState *sp = EncoderState(tif);

	(void) s;
	assert(sp != NULL);
	if( sp->state != LSTATE_INIT_ENCODE )
            tif->tif_setupencode(tif);

	sp->stream.next_out = tif->tif_rawdata;
	sp->stream.avail_out = (size_t)tif->tif_rawdatasize;
	if ((tmsize_t)sp->stream.avail_out != tif->tif_rawdatasize) {
		TIFFErrorExt(tif->tif_clientdata, module,
			     "Liblzma cannot deal with buffers this size");
		return 0;
	}
	return (lzma_stream_encoder(&sp->stream, sp->filters, sp->check) == LZMA_OK);
}

/*
 * Encode a chunk of pixels.
 */
static int
LZMAEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
{
	static const char module[] = "LZMAEncode";
	LZMAState *sp = EncoderState(tif);

	assert(sp != NULL);
	assert(sp->state == LSTATE_INIT_ENCODE);

	(void) s;
	sp->stream.next_in = bp;
	sp->stream.avail_in = (size_t) cc;
	if ((tmsize_t)sp->stream.avail_in != cc) {
		TIFFErrorExt(tif->tif_clientdata, module,
			     "Liblzma cannot deal with buffers this size");
		return 0;
	}
	do {
		lzma_ret ret = lzma_code(&sp->stream, LZMA_RUN);
		if (ret != LZMA_OK) {
			TIFFErrorExt(tif->tif_clientdata, module,
				"Encoding error at scanline %lu, %s",
				(unsigned long) tif->tif_row, LZMAStrerror(ret));
			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 = (size_t)tif->tif_rawdatasize;  /* this is a safe typecast, as check is made already in LZMAPreEncode */
		}
	} 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
LZMAPostEncode(TIFF* tif)
{
	static const char module[] = "LZMAPostEncode";
	LZMAState *sp = EncoderState(tif);
	lzma_ret ret;

	sp->stream.avail_in = 0;
	do {
		ret = lzma_code(&sp->stream, LZMA_FINISH);
		switch (ret) {
		case LZMA_STREAM_END:
		case LZMA_OK:
			if ((tmsize_t)sp->stream.avail_out != 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 = (size_t)tif->tif_rawdatasize;  /* this is a safe typecast, as check is made already in ZIPPreEncode */
			}
			break;
		default:
			TIFFErrorExt(tif->tif_clientdata, module, "Liblzma error: %s",
				     LZMAStrerror(ret));
			return 0;
		}
	} while (ret != LZMA_STREAM_END);
	return 1;
}

static void
LZMACleanup(TIFF* tif)
{
	LZMAState* sp = LState(tif);

	assert(sp != 0);

	(void)TIFFPredictorCleanup(tif);

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

	if (sp->state) {
		lzma_end(&sp->stream);
		sp->state = 0;
	}
	_TIFFfree(sp);
	tif->tif_data = NULL;

	_TIFFSetDefaultCompressionState(tif);
}

static int
LZMAVSetField(TIFF* tif, uint32 tag, va_list ap)
{
	static const char module[] = "LZMAVSetField";
	LZMAState* sp = LState(tif);

	switch (tag) {
	case TIFFTAG_LZMAPRESET:
		sp->preset = (int) va_arg(ap, int);
		lzma_lzma_preset(&sp->opt_lzma, sp->preset);
		if (sp->state & LSTATE_INIT_ENCODE) {
			lzma_ret ret = lzma_stream_encoder(&sp->stream,
							   sp->filters,
							   sp->check);
			if (ret != LZMA_OK) {
				TIFFErrorExt(tif->tif_clientdata, module,
					     "Liblzma error: %s",
					     LZMAStrerror(ret));
			}
		}
		return 1;
	default:
		return (*sp->vsetparent)(tif, tag, ap);
	}
	/*NOTREACHED*/
}

static int
LZMAVGetField(TIFF* tif, uint32 tag, va_list ap)
{
	LZMAState* sp = LState(tif);

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

static const TIFFField lzmaFields[] = {
	{ TIFFTAG_LZMAPRESET, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED,
		FIELD_PSEUDO, TRUE, FALSE, "LZMA2 Compression Preset", NULL },
};

int
TIFFInitLZMA(TIFF* tif, int scheme)
{
	static const char module[] = "TIFFInitLZMA";
	LZMAState* sp;
	lzma_stream tmp_stream = LZMA_STREAM_INIT;

	assert( scheme == COMPRESSION_LZMA );

	/*
	 * Merge codec-specific tag information.
	 */
	if (!_TIFFMergeFields(tif, lzmaFields, TIFFArrayCount(lzmaFields))) {
		TIFFErrorExt(tif->tif_clientdata, module,
			     "Merging LZMA2 codec-specific tags failed");
		return 0;
	}

	/*
	 * Allocate state block so tag methods have storage to record values.
	 */
	tif->tif_data = (uint8*) _TIFFmalloc(sizeof(LZMAState));
	if (tif->tif_data == NULL)
		goto bad;
	sp = LState(tif);
	memcpy(&sp->stream, &tmp_stream, sizeof(lzma_stream));

	/*
	 * Override parent get/set field methods.
	 */
	sp->vgetparent = tif->tif_tagmethods.vgetfield;
	tif->tif_tagmethods.vgetfield = LZMAVGetField;	/* hook for codec tags */
	sp->vsetparent = tif->tif_tagmethods.vsetfield;
	tif->tif_tagmethods.vsetfield = LZMAVSetField;	/* hook for codec tags */

	/* Default values for codec-specific fields */
	sp->preset = LZMA_PRESET_DEFAULT;		/* default comp. level */
	sp->check = LZMA_CHECK_NONE;
	sp->state = 0;

	/* Data filters. So far we are using delta and LZMA2 filters only. */
	sp->opt_delta.type = LZMA_DELTA_TYPE_BYTE;
	/*
	 * The sample size in bytes seems to be reasonable distance for delta
	 * filter.
	 */
	sp->opt_delta.dist = (tif->tif_dir.td_bitspersample % 8) ?
		1 : tif->tif_dir.td_bitspersample / 8;
	sp->filters[0].id = LZMA_FILTER_DELTA;
	sp->filters[0].options = &sp->opt_delta;

	lzma_lzma_preset(&sp->opt_lzma, sp->preset);
	sp->filters[1].id = LZMA_FILTER_LZMA2;
	sp->filters[1].options = &sp->opt_lzma;

	sp->filters[2].id = LZMA_VLI_UNKNOWN;
	sp->filters[2].options = NULL;

	/*
	 * Install codec methods.
	 */
	tif->tif_fixuptags = LZMAFixupTags;
	tif->tif_setupdecode = LZMASetupDecode;
	tif->tif_predecode = LZMAPreDecode;
	tif->tif_decoderow = LZMADecode;
	tif->tif_decodestrip = LZMADecode;
	tif->tif_decodetile = LZMADecode;
	tif->tif_setupencode = LZMASetupEncode;
	tif->tif_preencode = LZMAPreEncode;
	tif->tif_postencode = LZMAPostEncode;
	tif->tif_encoderow = LZMAEncode;
	tif->tif_encodestrip = LZMAEncode;
	tif->tif_encodetile = LZMAEncode;
	tif->tif_cleanup = LZMACleanup;
	/*
	 * Setup predictor setup.
	 */
	(void) TIFFPredictorInit(tif);
	return 1;
bad:
	TIFFErrorExt(tif->tif_clientdata, module,
		     "No space for LZMA2 state block");
	return 0;
}
#endif /* LZMA_SUPORT */

/* vim: set ts=8 sts=8 sw=8 noet: */
Commit	Line	Data
80ed523f VZ	1
	2	/*
	3	* Copyright (c) 2010, Andrey Kiselev <dron@ak4719.spb.edu>
	4	*
	5	* Permission to use, copy, modify, distribute, and sell this software and
	6	* its documentation for any purpose is hereby granted without fee, provided
	7	* that (i) the above copyright notices and this permission notice appear in
	8	* all copies of the software and related documentation, and (ii) the names of
	9	* Sam Leffler and Silicon Graphics may not be used in any advertising or
	10	* publicity relating to the software without the specific, prior written
	11	* permission of Sam Leffler and Silicon Graphics.
	12	*
	13	* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	14	* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	15	* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	16	*
	17	* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	18	* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	19	* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	20	* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	21	* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	22	* OF THIS SOFTWARE.
	23	*/
	24
	25	#include "tiffiop.h"
	26	#ifdef LZMA_SUPPORT
	27	/*
	28	* TIFF Library.
	29	*
	30	* LZMA2 Compression Support
	31	*
	32	* You need an LZMA2 SDK to link with. See http://tukaani.org/xz/ for details.
	33	*
	34	* The codec is derived from ZLIB codec (tif_zip.c).
	35	*/
	36
	37	#include "tif_predict.h"
	38	#include "lzma.h"
	39
	40	#include <stdio.h>
	41
	42	/*
	43	* State block for each open TIFF file using LZMA2 compression/decompression.
	44	*/
	45	typedef struct {
	46	TIFFPredictorState predict;
	47	lzma_stream stream;
	48	lzma_filter filters[LZMA_FILTERS_MAX + 1];
	49	lzma_options_delta opt_delta; /* delta filter options */
	50	lzma_options_lzma opt_lzma; /* LZMA2 filter options */
	51	int preset; /* compression level */
	52	lzma_check check; /* type of the integrity check */
	53	int state; /* state flags */
	54	#define LSTATE_INIT_DECODE 0x01
	55	#define LSTATE_INIT_ENCODE 0x02
	56
	57	TIFFVGetMethod vgetparent; /* super-class method */
	58	TIFFVSetMethod vsetparent; /* super-class method */
	59	} LZMAState;
	60
	61	#define LState(tif) ((LZMAState*) (tif)->tif_data)
	62	#define DecoderState(tif) LState(tif)
	63	#define EncoderState(tif) LState(tif)
	64
65	static int LZMAEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s);
66	static int LZMADecode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s);
67
68	static const char *
69	LZMAStrerror(lzma_ret ret)
70	{
71	switch (ret) {
72	case LZMA_OK:
73	return "operation completed successfully";
74	case LZMA_STREAM_END:
75	return "end of stream was reached";
76	case LZMA_NO_CHECK:
77	return "input stream has no integrity check";
78	case LZMA_UNSUPPORTED_CHECK:
79	return "cannot calculate the integrity check";
80	case LZMA_GET_CHECK:
81	return "integrity check type is now available";
82	case LZMA_MEM_ERROR:
83	return "cannot allocate memory";
84	case LZMA_MEMLIMIT_ERROR:
85	return "memory usage limit was reached";
86	case LZMA_FORMAT_ERROR:
87	return "file format not recognized";
88	case LZMA_OPTIONS_ERROR:
89	return "invalid or unsupported options";
90	case LZMA_DATA_ERROR:
91	return "data is corrupt";
92	case LZMA_BUF_ERROR:
93	return "no progress is possible (stream is truncated or corrupt)";
94	case LZMA_PROG_ERROR:
95	return "programming error";
96	default:
97	return "unindentified liblzma error";
98	}
99	}
100
101	static int
102	LZMAFixupTags(TIFF* tif)
103	{
104	(void) tif;
105	return 1;
106	}
107
108	static int
109	LZMASetupDecode(TIFF* tif)
110	{
111	LZMAState* sp = DecoderState(tif);
112
113	assert(sp != NULL);
114
115	/* if we were last encoding, terminate this mode */
116	if (sp->state & LSTATE_INIT_ENCODE) {
117	lzma_end(&sp->stream);
118	sp->state = 0;
119	}
120
121	sp->state \|= LSTATE_INIT_DECODE;
122	return 1;
123	}
124
125	/*
126	* Setup state for decoding a strip.
127	*/
128	static int
129	LZMAPreDecode(TIFF* tif, uint16 s)
130	{
131	static const char module[] = "LZMAPreDecode";
132	LZMAState* sp = DecoderState(tif);
133	lzma_ret ret;
134
135	(void) s;
136	assert(sp != NULL);
137
138	if( (sp->state & LSTATE_INIT_DECODE) == 0 )
139	tif->tif_setupdecode(tif);
140
141	sp->stream.next_in = tif->tif_rawdata;
142	sp->stream.avail_in = (size_t) tif->tif_rawcc;
143	if ((tmsize_t)sp->stream.avail_in != tif->tif_rawcc) {
144	TIFFErrorExt(tif->tif_clientdata, module,
145	"Liblzma cannot deal with buffers this size");
146	return 0;
147	}
148
149	/*
150	* Disable memory limit when decoding. UINT64_MAX is a flag to disable
151	* the limit, we are passing (uint64_t)-1 which should be the same.
152	*/
153	ret = lzma_stream_decoder(&sp->stream, (uint64_t)-1, 0);
154	if (ret != LZMA_OK) {
155	TIFFErrorExt(tif->tif_clientdata, module,
156	"Error initializing the stream decoder, %s",
157	LZMAStrerror(ret));
158	return 0;
159	}
160	return 1;
161	}
162
163	static int
164	LZMADecode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
165	{
166	static const char module[] = "LZMADecode";
167	LZMAState* sp = DecoderState(tif);
168
169	(void) s;
170	assert(sp != NULL);
171	assert(sp->state == LSTATE_INIT_DECODE);
172
173	sp->stream.next_in = tif->tif_rawcp;
174	sp->stream.avail_in = (size_t) tif->tif_rawcc;
175
176	sp->stream.next_out = op;
177	sp->stream.avail_out = (size_t) occ;
178	if ((tmsize_t)sp->stream.avail_out != occ) {
179	TIFFErrorExt(tif->tif_clientdata, module,
180	"Liblzma cannot deal with buffers this size");
181	return 0;
182	}
183
184	do {
185	/*
186	* Save the current stream state to properly recover from the
187	* decoding errors later.
188	*/
189	const uint8_t *next_in = sp->stream.next_in;
190	size_t avail_in = sp->stream.avail_in;
191
192	lzma_ret ret = lzma_code(&sp->stream, LZMA_RUN);
193	if (ret == LZMA_STREAM_END)
194	break;
195	if (ret == LZMA_MEMLIMIT_ERROR) {
196	lzma_ret r = lzma_stream_decoder(&sp->stream,
197	lzma_memusage(&sp->stream), 0);
198	if (r != LZMA_OK) {
199	TIFFErrorExt(tif->tif_clientdata, module,
200	"Error initializing the stream decoder, %s",
201	LZMAStrerror(r));
202	break;
203	}
204	sp->stream.next_in = next_in;
205	sp->stream.avail_in = avail_in;
206	continue;
207	}
208	if (ret != LZMA_OK) {
209	TIFFErrorExt(tif->tif_clientdata, module,
210	"Decoding error at scanline %lu, %s",
211	(unsigned long) tif->tif_row, LZMAStrerror(ret));
212	break;
213	}
214	} while (sp->stream.avail_out > 0);
215	if (sp->stream.avail_out != 0) {
216	TIFFErrorExt(tif->tif_clientdata, module,
217	"Not enough data at scanline %lu (short %lu bytes)",
218	(unsigned long) tif->tif_row, (unsigned long) sp->stream.avail_out);
219	return 0;
220	}
221
222	tif->tif_rawcp = (uint8 )sp->stream.next_in; / cast away const */
223	tif->tif_rawcc = sp->stream.avail_in;
224
225	return 1;
226	}
227
228	static int
229	LZMASetupEncode(TIFF* tif)
230	{
231	LZMAState* sp = EncoderState(tif);
232
233	assert(sp != NULL);
234	if (sp->state & LSTATE_INIT_DECODE) {
235	lzma_end(&sp->stream);
236	sp->state = 0;
237	}
238
239	sp->state \|= LSTATE_INIT_ENCODE;
240	return 1;
241	}
242
243	/*
244	* Reset encoding state at the start of a strip.
245	*/
246	static int
247	LZMAPreEncode(TIFF* tif, uint16 s)
248	{
249	static const char module[] = "LZMAPreEncode";
250	LZMAState *sp = EncoderState(tif);
251
252	(void) s;
253	assert(sp != NULL);
254	if( sp->state != LSTATE_INIT_ENCODE )
255	tif->tif_setupencode(tif);
256
257	sp->stream.next_out = tif->tif_rawdata;
258	sp->stream.avail_out = (size_t)tif->tif_rawdatasize;
259	if ((tmsize_t)sp->stream.avail_out != tif->tif_rawdatasize) {
260	TIFFErrorExt(tif->tif_clientdata, module,
261	"Liblzma cannot deal with buffers this size");
262	return 0;
263	}
264	return (lzma_stream_encoder(&sp->stream, sp->filters, sp->check) == LZMA_OK);
265	}
266
267	/*
268	* Encode a chunk of pixels.
269	*/
270	static int
271	LZMAEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
272	{
273	static const char module[] = "LZMAEncode";
274	LZMAState *sp = EncoderState(tif);
275
276	assert(sp != NULL);
277	assert(sp->state == LSTATE_INIT_ENCODE);
278
279	(void) s;
280	sp->stream.next_in = bp;
281	sp->stream.avail_in = (size_t) cc;
282	if ((tmsize_t)sp->stream.avail_in != cc) {
283	TIFFErrorExt(tif->tif_clientdata, module,
284	"Liblzma cannot deal with buffers this size");
285	return 0;
286	}
287	do {
288	lzma_ret ret = lzma_code(&sp->stream, LZMA_RUN);
289	if (ret != LZMA_OK) {
290	TIFFErrorExt(tif->tif_clientdata, module,
291	"Encoding error at scanline %lu, %s",
292	(unsigned long) tif->tif_row, LZMAStrerror(ret));
293	return 0;
294	}
295	if (sp->stream.avail_out == 0) {
296	tif->tif_rawcc = tif->tif_rawdatasize;
297	TIFFFlushData1(tif);
298	sp->stream.next_out = tif->tif_rawdata;
299	sp->stream.avail_out = (size_t)tif->tif_rawdatasize; /* this is a safe typecast, as check is made already in LZMAPreEncode */
300	}
301	} while (sp->stream.avail_in > 0);
302	return 1;
303	}
304
305	/*
306	* Finish off an encoded strip by flushing the last
307	* string and tacking on an End Of Information code.
308	*/
309	static int
310	LZMAPostEncode(TIFF* tif)
311	{
312	static const char module[] = "LZMAPostEncode";
313	LZMAState *sp = EncoderState(tif);
314	lzma_ret ret;
315
316	sp->stream.avail_in = 0;
317	do {
318	ret = lzma_code(&sp->stream, LZMA_FINISH);
319	switch (ret) {
320	case LZMA_STREAM_END:
321	case LZMA_OK:
322	if ((tmsize_t)sp->stream.avail_out != tif->tif_rawdatasize) {
323	tif->tif_rawcc =
324	tif->tif_rawdatasize - sp->stream.avail_out;
325	TIFFFlushData1(tif);
326	sp->stream.next_out = tif->tif_rawdata;
327	sp->stream.avail_out = (size_t)tif->tif_rawdatasize; /* this is a safe typecast, as check is made already in ZIPPreEncode */
328	}
329	break;
330	default:
331	TIFFErrorExt(tif->tif_clientdata, module, "Liblzma error: %s",
332	LZMAStrerror(ret));
333	return 0;
334	}
335	} while (ret != LZMA_STREAM_END);
336	return 1;
337	}
338
339	static void
340	LZMACleanup(TIFF* tif)
341	{
342	LZMAState* sp = LState(tif);
343
344	assert(sp != 0);
345
346	(void)TIFFPredictorCleanup(tif);
347
348	tif->tif_tagmethods.vgetfield = sp->vgetparent;
349	tif->tif_tagmethods.vsetfield = sp->vsetparent;
350
351	if (sp->state) {
352	lzma_end(&sp->stream);
353	sp->state = 0;
354	}
355	_TIFFfree(sp);
356	tif->tif_data = NULL;
357
358	_TIFFSetDefaultCompressionState(tif);
359	}
360
361	static int
362	LZMAVSetField(TIFF* tif, uint32 tag, va_list ap)
363	{
364	static const char module[] = "LZMAVSetField";
365	LZMAState* sp = LState(tif);
366
367	switch (tag) {
368	case TIFFTAG_LZMAPRESET:
369	sp->preset = (int) va_arg(ap, int);
370	lzma_lzma_preset(&sp->opt_lzma, sp->preset);
371	if (sp->state & LSTATE_INIT_ENCODE) {
372	lzma_ret ret = lzma_stream_encoder(&sp->stream,
373	sp->filters,
374	sp->check);
375	if (ret != LZMA_OK) {
376	TIFFErrorExt(tif->tif_clientdata, module,
377	"Liblzma error: %s",
378	LZMAStrerror(ret));
379	}
380	}
381	return 1;
382	default:
383	return (*sp->vsetparent)(tif, tag, ap);
384	}
385	/NOTREACHED/
386	}
387
388	static int
389	LZMAVGetField(TIFF* tif, uint32 tag, va_list ap)
390	{
391	LZMAState* sp = LState(tif);
392
393	switch (tag) {
394	case TIFFTAG_LZMAPRESET:
395	va_arg(ap, int) = sp->preset;
396	break;
397	default:
398	return (*sp->vgetparent)(tif, tag, ap);
399	}
400	return 1;
401	}
402
403	static const TIFFField lzmaFields[] = {
404	{ TIFFTAG_LZMAPRESET, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED,
405	FIELD_PSEUDO, TRUE, FALSE, "LZMA2 Compression Preset", NULL },
406	};
407
408	int
409	TIFFInitLZMA(TIFF* tif, int scheme)
410	{
411	static const char module[] = "TIFFInitLZMA";
412	LZMAState* sp;
413	lzma_stream tmp_stream = LZMA_STREAM_INIT;
414
415	assert( scheme == COMPRESSION_LZMA );
416
417	/*
418	* Merge codec-specific tag information.
419	*/
420	if (!_TIFFMergeFields(tif, lzmaFields, TIFFArrayCount(lzmaFields))) {
421	TIFFErrorExt(tif->tif_clientdata, module,
422	"Merging LZMA2 codec-specific tags failed");
423	return 0;
424	}
425
426	/*
427	* Allocate state block so tag methods have storage to record values.
428	*/
429	tif->tif_data = (uint8*) _TIFFmalloc(sizeof(LZMAState));
430	if (tif->tif_data == NULL)
431	goto bad;
432	sp = LState(tif);
433	memcpy(&sp->stream, &tmp_stream, sizeof(lzma_stream));
434
435	/*
436	* Override parent get/set field methods.
437	*/
438	sp->vgetparent = tif->tif_tagmethods.vgetfield;
439	tif->tif_tagmethods.vgetfield = LZMAVGetField; /* hook for codec tags */
440	sp->vsetparent = tif->tif_tagmethods.vsetfield;
441	tif->tif_tagmethods.vsetfield = LZMAVSetField; /* hook for codec tags */
442
443	/* Default values for codec-specific fields */
444	sp->preset = LZMA_PRESET_DEFAULT; /* default comp. level */
445	sp->check = LZMA_CHECK_NONE;
446	sp->state = 0;
447
448	/* Data filters. So far we are using delta and LZMA2 filters only. */
449	sp->opt_delta.type = LZMA_DELTA_TYPE_BYTE;
450	/*
451	* The sample size in bytes seems to be reasonable distance for delta
452	* filter.
453	*/
454	sp->opt_delta.dist = (tif->tif_dir.td_bitspersample % 8) ?
455	1 : tif->tif_dir.td_bitspersample / 8;
456	sp->filters[0].id = LZMA_FILTER_DELTA;
457	sp->filters[0].options = &sp->opt_delta;
458
459	lzma_lzma_preset(&sp->opt_lzma, sp->preset);
460	sp->filters[1].id = LZMA_FILTER_LZMA2;
461	sp->filters[1].options = &sp->opt_lzma;
462
463	sp->filters[2].id = LZMA_VLI_UNKNOWN;
464	sp->filters[2].options = NULL;
465
466	/*
467	* Install codec methods.
468	*/
469	tif->tif_fixuptags = LZMAFixupTags;
470	tif->tif_setupdecode = LZMASetupDecode;
471	tif->tif_predecode = LZMAPreDecode;
472	tif->tif_decoderow = LZMADecode;
473	tif->tif_decodestrip = LZMADecode;
474	tif->tif_decodetile = LZMADecode;
475	tif->tif_setupencode = LZMASetupEncode;
476	tif->tif_preencode = LZMAPreEncode;
477	tif->tif_postencode = LZMAPostEncode;
478	tif->tif_encoderow = LZMAEncode;
479	tif->tif_encodestrip = LZMAEncode;
480	tif->tif_encodetile = LZMAEncode;
481	tif->tif_cleanup = LZMACleanup;
482	/*
483	* Setup predictor setup.
484	*/
485	(void) TIFFPredictorInit(tif);
486	return 1;
487	bad:
488	TIFFErrorExt(tif->tif_clientdata, module,
489	"No space for LZMA2 state block");
490	return 0;
491	}
492	#endif /* LZMA_SUPORT */
493
494	/* vim: set ts=8 sts=8 sw=8 noet: */