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/src/FreeImage/Source/LibTIFF/tif_write.c

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C | 718 lines | 432 code | 52 blank | 234 comment | 120 complexity | 03c2574b07b73562ee0e7ec7320bbda0 MD5 | raw file
  1/* $Id: tif_write.c,v 1.37 2011/04/10 17:14:09 drolon Exp $ */
  2
  3/*
  4 * Copyright (c) 1988-1997 Sam Leffler
  5 * Copyright (c) 1991-1997 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/*
 28 * TIFF Library.
 29 *
 30 * Scanline-oriented Write Support
 31 */
 32#include "tiffiop.h"
 33#include <stdio.h>
 34
 35#define	STRIPINCR	20		/* expansion factor on strip array */
 36
 37#define	WRITECHECKSTRIPS(tif, module)				\
 38	(((tif)->tif_flags&TIFF_BEENWRITING) || TIFFWriteCheck((tif),0,module))
 39#define	WRITECHECKTILES(tif, module)				\
 40	(((tif)->tif_flags&TIFF_BEENWRITING) || TIFFWriteCheck((tif),1,module))
 41#define	BUFFERCHECK(tif)					\
 42	((((tif)->tif_flags & TIFF_BUFFERSETUP) && tif->tif_rawdata) ||	\
 43	    TIFFWriteBufferSetup((tif), NULL, (tsize_t) -1))
 44
 45static	int TIFFGrowStrips(TIFF*, int, const char*);
 46static	int TIFFAppendToStrip(TIFF*, tstrip_t, tidata_t, tsize_t);
 47
 48int
 49TIFFWriteScanline(TIFF* tif, tdata_t buf, uint32 row, tsample_t sample)
 50{
 51	static const char module[] = "TIFFWriteScanline";
 52	register TIFFDirectory *td;
 53	int status, imagegrew = 0;
 54	tstrip_t strip;
 55
 56	if (!WRITECHECKSTRIPS(tif, module))
 57		return (-1);
 58	/*
 59	 * Handle delayed allocation of data buffer.  This
 60	 * permits it to be sized more intelligently (using
 61	 * directory information).
 62	 */
 63	if (!BUFFERCHECK(tif))
 64		return (-1);
 65	td = &tif->tif_dir;
 66	/*
 67	 * Extend image length if needed
 68	 * (but only for PlanarConfig=1).
 69	 */
 70	if (row >= td->td_imagelength) {	/* extend image */
 71		if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
 72			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
 73		"Can not change \"ImageLength\" when using separate planes");
 74			return (-1);
 75		}
 76		td->td_imagelength = row+1;
 77		imagegrew = 1;
 78	}
 79	/*
 80	 * Calculate strip and check for crossings.
 81	 */
 82	if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
 83		if (sample >= td->td_samplesperpixel) {
 84			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
 85			    "%d: Sample out of range, max %d",
 86			    sample, td->td_samplesperpixel);
 87			return (-1);
 88		}
 89		strip = sample*td->td_stripsperimage + row/td->td_rowsperstrip;
 90	} else
 91		strip = row / td->td_rowsperstrip;
 92	/*
 93	 * Check strip array to make sure there's space. We don't support
 94	 * dynamically growing files that have data organized in separate
 95	 * bitplanes because it's too painful.  In that case we require that
 96	 * the imagelength be set properly before the first write (so that the
 97	 * strips array will be fully allocated above).
 98	 */
 99	if (strip >= td->td_nstrips && !TIFFGrowStrips(tif, 1, module))
100		return (-1);
101	if (strip != tif->tif_curstrip) {
102		/*
103		 * Changing strips -- flush any data present.
104		 */
105		if (!TIFFFlushData(tif))
106			return (-1);
107		tif->tif_curstrip = strip;
108		/*
109		 * Watch out for a growing image.  The value of strips/image
110		 * will initially be 1 (since it can't be deduced until the
111		 * imagelength is known).
112		 */
113		if (strip >= td->td_stripsperimage && imagegrew)
114			td->td_stripsperimage =
115			    TIFFhowmany(td->td_imagelength,td->td_rowsperstrip);
116		tif->tif_row =
117		    (strip % td->td_stripsperimage) * td->td_rowsperstrip;
118		if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
119			if (!(*tif->tif_setupencode)(tif))
120				return (-1);
121			tif->tif_flags |= TIFF_CODERSETUP;
122		}
123        
124		tif->tif_rawcc = 0;
125		tif->tif_rawcp = tif->tif_rawdata;
126
127		if( td->td_stripbytecount[strip] > 0 )
128		{
129			/* if we are writing over existing tiles, zero length */
130			td->td_stripbytecount[strip] = 0;
131
132			/* this forces TIFFAppendToStrip() to do a seek */
133			tif->tif_curoff = 0;
134		}
135
136		if (!(*tif->tif_preencode)(tif, sample))
137			return (-1);
138		tif->tif_flags |= TIFF_POSTENCODE;
139	}
140	/*
141	 * Ensure the write is either sequential or at the
142	 * beginning of a strip (or that we can randomly
143	 * access the data -- i.e. no encoding).
144	 */
145	if (row != tif->tif_row) {
146		if (row < tif->tif_row) {
147			/*
148			 * Moving backwards within the same strip:
149			 * backup to the start and then decode
150			 * forward (below).
151			 */
152			tif->tif_row = (strip % td->td_stripsperimage) *
153			    td->td_rowsperstrip;
154			tif->tif_rawcp = tif->tif_rawdata;
155		}
156		/*
157		 * Seek forward to the desired row.
158		 */
159		if (!(*tif->tif_seek)(tif, row - tif->tif_row))
160			return (-1);
161		tif->tif_row = row;
162	}
163
164        /* swab if needed - note that source buffer will be altered */
165        tif->tif_postdecode( tif, (tidata_t) buf, tif->tif_scanlinesize );
166
167	status = (*tif->tif_encoderow)(tif, (tidata_t) buf,
168	    tif->tif_scanlinesize, sample);
169
170        /* we are now poised at the beginning of the next row */
171	tif->tif_row = row + 1;
172	return (status);
173}
174
175/*
176 * Encode the supplied data and write it to the
177 * specified strip.
178 *
179 * NB: Image length must be setup before writing.
180 */
181tsize_t
182TIFFWriteEncodedStrip(TIFF* tif, tstrip_t strip, tdata_t data, tsize_t cc)
183{
184	static const char module[] = "TIFFWriteEncodedStrip";
185	TIFFDirectory *td = &tif->tif_dir;
186	tsample_t sample;
187
188	if (!WRITECHECKSTRIPS(tif, module))
189		return ((tsize_t) -1);
190	/*
191	 * Check strip array to make sure there's space.
192	 * We don't support dynamically growing files that
193	 * have data organized in separate bitplanes because
194	 * it's too painful.  In that case we require that
195	 * the imagelength be set properly before the first
196	 * write (so that the strips array will be fully
197	 * allocated above).
198	 */
199	if (strip >= td->td_nstrips) {
200		if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
201			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
202		"Can not grow image by strips when using separate planes");
203			return ((tsize_t) -1);
204		}
205		if (!TIFFGrowStrips(tif, 1, module))
206			return ((tsize_t) -1);
207		td->td_stripsperimage =
208		    TIFFhowmany(td->td_imagelength, td->td_rowsperstrip);
209	}
210	/*
211	 * Handle delayed allocation of data buffer.  This
212	 * permits it to be sized according to the directory
213	 * info.
214	 */
215	if (!BUFFERCHECK(tif))
216		return ((tsize_t) -1);
217	tif->tif_curstrip = strip;
218	tif->tif_row = (strip % td->td_stripsperimage) * td->td_rowsperstrip;
219	if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
220		if (!(*tif->tif_setupencode)(tif))
221			return ((tsize_t) -1);
222		tif->tif_flags |= TIFF_CODERSETUP;
223	}
224        
225	tif->tif_rawcc = 0;
226	tif->tif_rawcp = tif->tif_rawdata;
227
228        if( td->td_stripbytecount[strip] > 0 )
229        {
230	    /* Force TIFFAppendToStrip() to consider placing data at end
231               of file. */
232            tif->tif_curoff = 0;
233        }
234        
235	tif->tif_flags &= ~TIFF_POSTENCODE;
236	sample = (tsample_t)(strip / td->td_stripsperimage);
237	if (!(*tif->tif_preencode)(tif, sample))
238		return ((tsize_t) -1);
239
240        /* swab if needed - note that source buffer will be altered */
241        tif->tif_postdecode( tif, (tidata_t) data, cc );
242
243	if (!(*tif->tif_encodestrip)(tif, (tidata_t) data, cc, sample))
244		return ((tsize_t) 0);
245	if (!(*tif->tif_postencode)(tif))
246		return ((tsize_t) -1);
247	if (!isFillOrder(tif, td->td_fillorder) &&
248	    (tif->tif_flags & TIFF_NOBITREV) == 0)
249		TIFFReverseBits(tif->tif_rawdata, tif->tif_rawcc);
250	if (tif->tif_rawcc > 0 &&
251	    !TIFFAppendToStrip(tif, strip, tif->tif_rawdata, tif->tif_rawcc))
252		return ((tsize_t) -1);
253	tif->tif_rawcc = 0;
254	tif->tif_rawcp = tif->tif_rawdata;
255	return (cc);
256}
257
258/*
259 * Write the supplied data to the specified strip.
260 *
261 * NB: Image length must be setup before writing.
262 */
263tsize_t
264TIFFWriteRawStrip(TIFF* tif, tstrip_t strip, tdata_t data, tsize_t cc)
265{
266	static const char module[] = "TIFFWriteRawStrip";
267	TIFFDirectory *td = &tif->tif_dir;
268
269	if (!WRITECHECKSTRIPS(tif, module))
270		return ((tsize_t) -1);
271	/*
272	 * Check strip array to make sure there's space.
273	 * We don't support dynamically growing files that
274	 * have data organized in separate bitplanes because
275	 * it's too painful.  In that case we require that
276	 * the imagelength be set properly before the first
277	 * write (so that the strips array will be fully
278	 * allocated above).
279	 */
280	if (strip >= td->td_nstrips) {
281		if (td->td_planarconfig == PLANARCONFIG_SEPARATE) {
282			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
283		"Can not grow image by strips when using separate planes");
284			return ((tsize_t) -1);
285		}
286		/*
287		 * Watch out for a growing image.  The value of
288		 * strips/image will initially be 1 (since it
289		 * can't be deduced until the imagelength is known).
290		 */
291		if (strip >= td->td_stripsperimage)
292			td->td_stripsperimage =
293			    TIFFhowmany(td->td_imagelength,td->td_rowsperstrip);
294		if (!TIFFGrowStrips(tif, 1, module))
295			return ((tsize_t) -1);
296	}
297	tif->tif_curstrip = strip;
298	tif->tif_row = (strip % td->td_stripsperimage) * td->td_rowsperstrip;
299	return (TIFFAppendToStrip(tif, strip, (tidata_t) data, cc) ?
300	    cc : (tsize_t) -1);
301}
302
303/*
304 * Write and compress a tile of data.  The
305 * tile is selected by the (x,y,z,s) coordinates.
306 */
307tsize_t
308TIFFWriteTile(TIFF* tif,
309    tdata_t buf, uint32 x, uint32 y, uint32 z, tsample_t s)
310{
311	if (!TIFFCheckTile(tif, x, y, z, s))
312		return (-1);
313	/*
314	 * NB: A tile size of -1 is used instead of tif_tilesize knowing
315	 *     that TIFFWriteEncodedTile will clamp this to the tile size.
316	 *     This is done because the tile size may not be defined until
317	 *     after the output buffer is setup in TIFFWriteBufferSetup.
318	 */
319	return (TIFFWriteEncodedTile(tif,
320	    TIFFComputeTile(tif, x, y, z, s), buf, (tsize_t) -1));
321}
322
323/*
324 * Encode the supplied data and write it to the
325 * specified tile.  There must be space for the
326 * data.  The function clamps individual writes
327 * to a tile to the tile size, but does not (and
328 * can not) check that multiple writes to the same
329 * tile do not write more than tile size data.
330 *
331 * NB: Image length must be setup before writing; this
332 *     interface does not support automatically growing
333 *     the image on each write (as TIFFWriteScanline does).
334 */
335tsize_t
336TIFFWriteEncodedTile(TIFF* tif, ttile_t tile, tdata_t data, tsize_t cc)
337{
338	static const char module[] = "TIFFWriteEncodedTile";
339	TIFFDirectory *td;
340	tsample_t sample;
341
342	if (!WRITECHECKTILES(tif, module))
343		return ((tsize_t) -1);
344	td = &tif->tif_dir;
345	if (tile >= td->td_nstrips) {
346		TIFFErrorExt(tif->tif_clientdata, module, "%s: Tile %lu out of range, max %lu",
347		    tif->tif_name, (unsigned long) tile, (unsigned long) td->td_nstrips);
348		return ((tsize_t) -1);
349	}
350	/*
351	 * Handle delayed allocation of data buffer.  This
352	 * permits it to be sized more intelligently (using
353	 * directory information).
354	 */
355	if (!BUFFERCHECK(tif))
356		return ((tsize_t) -1);
357	tif->tif_curtile = tile;
358
359	tif->tif_rawcc = 0;
360	tif->tif_rawcp = tif->tif_rawdata;
361
362        if( td->td_stripbytecount[tile] > 0 )
363        {
364	    /* Force TIFFAppendToStrip() to consider placing data at end
365               of file. */
366            tif->tif_curoff = 0;
367        }
368        
369	/* 
370	 * Compute tiles per row & per column to compute
371	 * current row and column
372	 */
373	tif->tif_row = (tile % TIFFhowmany(td->td_imagelength, td->td_tilelength))
374		* td->td_tilelength;
375	tif->tif_col = (tile % TIFFhowmany(td->td_imagewidth, td->td_tilewidth))
376		* td->td_tilewidth;
377
378	if ((tif->tif_flags & TIFF_CODERSETUP) == 0) {
379		if (!(*tif->tif_setupencode)(tif))
380			return ((tsize_t) -1);
381		tif->tif_flags |= TIFF_CODERSETUP;
382	}
383	tif->tif_flags &= ~TIFF_POSTENCODE;
384	sample = (tsample_t)(tile/td->td_stripsperimage);
385	if (!(*tif->tif_preencode)(tif, sample))
386		return ((tsize_t) -1);
387	/*
388	 * Clamp write amount to the tile size.  This is mostly
389	 * done so that callers can pass in some large number
390	 * (e.g. -1) and have the tile size used instead.
391	 */
392	if ( cc < 1 || cc > tif->tif_tilesize)
393		cc = tif->tif_tilesize;
394
395        /* swab if needed - note that source buffer will be altered */
396        tif->tif_postdecode( tif, (tidata_t) data, cc );
397
398	if (!(*tif->tif_encodetile)(tif, (tidata_t) data, cc, sample))
399		return ((tsize_t) 0);
400	if (!(*tif->tif_postencode)(tif))
401		return ((tsize_t) -1);
402	if (!isFillOrder(tif, td->td_fillorder) &&
403	    (tif->tif_flags & TIFF_NOBITREV) == 0)
404		TIFFReverseBits((unsigned char *)tif->tif_rawdata, tif->tif_rawcc);
405	if (tif->tif_rawcc > 0 && !TIFFAppendToStrip(tif, tile,
406	    tif->tif_rawdata, tif->tif_rawcc))
407		return ((tsize_t) -1);
408	tif->tif_rawcc = 0;
409	tif->tif_rawcp = tif->tif_rawdata;
410	return (cc);
411}
412
413/*
414 * Write the supplied data to the specified strip.
415 * There must be space for the data; we don't check
416 * if strips overlap!
417 *
418 * NB: Image length must be setup before writing; this
419 *     interface does not support automatically growing
420 *     the image on each write (as TIFFWriteScanline does).
421 */
422tsize_t
423TIFFWriteRawTile(TIFF* tif, ttile_t tile, tdata_t data, tsize_t cc)
424{
425	static const char module[] = "TIFFWriteRawTile";
426
427	if (!WRITECHECKTILES(tif, module))
428		return ((tsize_t) -1);
429	if (tile >= tif->tif_dir.td_nstrips) {
430		TIFFErrorExt(tif->tif_clientdata, module, "%s: Tile %lu out of range, max %lu",
431		    tif->tif_name, (unsigned long) tile,
432		    (unsigned long) tif->tif_dir.td_nstrips);
433		return ((tsize_t) -1);
434	}
435	return (TIFFAppendToStrip(tif, tile, (tidata_t) data, cc) ?
436	    cc : (tsize_t) -1);
437}
438
439#define	isUnspecified(tif, f) \
440    (TIFFFieldSet(tif,f) && (tif)->tif_dir.td_imagelength == 0)
441
442int
443TIFFSetupStrips(TIFF* tif)
444{
445	TIFFDirectory* td = &tif->tif_dir;
446
447	if (isTiled(tif))
448		td->td_stripsperimage =
449		    isUnspecified(tif, FIELD_TILEDIMENSIONS) ?
450			td->td_samplesperpixel : TIFFNumberOfTiles(tif);
451	else
452		td->td_stripsperimage =
453		    isUnspecified(tif, FIELD_ROWSPERSTRIP) ?
454			td->td_samplesperpixel : TIFFNumberOfStrips(tif);
455	td->td_nstrips = td->td_stripsperimage;
456	if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
457		td->td_stripsperimage /= td->td_samplesperpixel;
458	td->td_stripoffset = (uint32 *)
459	    _TIFFmalloc(td->td_nstrips * sizeof (uint32));
460	td->td_stripbytecount = (uint32 *)
461	    _TIFFmalloc(td->td_nstrips * sizeof (uint32));
462	if (td->td_stripoffset == NULL || td->td_stripbytecount == NULL)
463		return (0);
464	/*
465	 * Place data at the end-of-file
466	 * (by setting offsets to zero).
467	 */
468	_TIFFmemset(td->td_stripoffset, 0, td->td_nstrips*sizeof (uint32));
469	_TIFFmemset(td->td_stripbytecount, 0, td->td_nstrips*sizeof (uint32));
470	TIFFSetFieldBit(tif, FIELD_STRIPOFFSETS);
471	TIFFSetFieldBit(tif, FIELD_STRIPBYTECOUNTS);
472	return (1);
473}
474#undef isUnspecified
475
476/*
477 * Verify file is writable and that the directory
478 * information is setup properly.  In doing the latter
479 * we also "freeze" the state of the directory so
480 * that important information is not changed.
481 */
482int
483TIFFWriteCheck(TIFF* tif, int tiles, const char* module)
484{
485	if (tif->tif_mode == O_RDONLY) {
486		TIFFErrorExt(tif->tif_clientdata, module, "%s: File not open for writing",
487		    tif->tif_name);
488		return (0);
489	}
490	if (tiles ^ isTiled(tif)) {
491		TIFFErrorExt(tif->tif_clientdata, tif->tif_name, tiles ?
492		    "Can not write tiles to a stripped image" :
493		    "Can not write scanlines to a tiled image");
494		return (0);
495	}
496        
497	/*
498	 * On the first write verify all the required information
499	 * has been setup and initialize any data structures that
500	 * had to wait until directory information was set.
501	 * Note that a lot of our work is assumed to remain valid
502	 * because we disallow any of the important parameters
503	 * from changing after we start writing (i.e. once
504	 * TIFF_BEENWRITING is set, TIFFSetField will only allow
505	 * the image's length to be changed).
506	 */
507	if (!TIFFFieldSet(tif, FIELD_IMAGEDIMENSIONS)) {
508		TIFFErrorExt(tif->tif_clientdata, module,
509		    "%s: Must set \"ImageWidth\" before writing data",
510		    tif->tif_name);
511		return (0);
512	}
513	if (tif->tif_dir.td_samplesperpixel == 1) {
514		/* 
515		 * Planarconfiguration is irrelevant in case of single band
516		 * images and need not be included. We will set it anyway,
517		 * because this field is used in other parts of library even
518		 * in the single band case.
519		 */
520		if (!TIFFFieldSet(tif, FIELD_PLANARCONFIG))
521                    tif->tif_dir.td_planarconfig = PLANARCONFIG_CONTIG;
522	} else {
523		if (!TIFFFieldSet(tif, FIELD_PLANARCONFIG)) {
524			TIFFErrorExt(tif->tif_clientdata, module,
525		    "%s: Must set \"PlanarConfiguration\" before writing data",
526			    tif->tif_name);
527			return (0);
528		}
529	}
530	if (tif->tif_dir.td_stripoffset == NULL && !TIFFSetupStrips(tif)) {
531		tif->tif_dir.td_nstrips = 0;
532		TIFFErrorExt(tif->tif_clientdata, module, "%s: No space for %s arrays",
533		    tif->tif_name, isTiled(tif) ? "tile" : "strip");
534		return (0);
535	}
536	tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tsize_t) -1;
537	tif->tif_scanlinesize = TIFFScanlineSize(tif);
538	tif->tif_flags |= TIFF_BEENWRITING;
539	return (1);
540}
541
542/*
543 * Setup the raw data buffer used for encoding.
544 */
545int
546TIFFWriteBufferSetup(TIFF* tif, tdata_t bp, tsize_t size)
547{
548	static const char module[] = "TIFFWriteBufferSetup";
549
550	if (tif->tif_rawdata) {
551		if (tif->tif_flags & TIFF_MYBUFFER) {
552			_TIFFfree(tif->tif_rawdata);
553			tif->tif_flags &= ~TIFF_MYBUFFER;
554		}
555		tif->tif_rawdata = NULL;
556	}
557	if (size == (tsize_t) -1) {
558		size = (isTiled(tif) ?
559		    tif->tif_tilesize : TIFFStripSize(tif));
560		/*
561		 * Make raw data buffer at least 8K
562		 */
563		if (size < 8*1024)
564			size = 8*1024;
565		bp = NULL;			/* NB: force malloc */
566	}
567	if (bp == NULL) {
568		bp = _TIFFmalloc(size);
569		if (bp == NULL) {
570			TIFFErrorExt(tif->tif_clientdata, module, "%s: No space for output buffer",
571			    tif->tif_name);
572			return (0);
573		}
574		tif->tif_flags |= TIFF_MYBUFFER;
575	} else
576		tif->tif_flags &= ~TIFF_MYBUFFER;
577	tif->tif_rawdata = (tidata_t) bp;
578	tif->tif_rawdatasize = size;
579	tif->tif_rawcc = 0;
580	tif->tif_rawcp = tif->tif_rawdata;
581	tif->tif_flags |= TIFF_BUFFERSETUP;
582	return (1);
583}
584
585/*
586 * Grow the strip data structures by delta strips.
587 */
588static int
589TIFFGrowStrips(TIFF* tif, int delta, const char* module)
590{
591	TIFFDirectory	*td = &tif->tif_dir;
592	uint32		*new_stripoffset, *new_stripbytecount;
593
594	assert(td->td_planarconfig == PLANARCONFIG_CONTIG);
595	new_stripoffset = (uint32*)_TIFFrealloc(td->td_stripoffset,
596		(td->td_nstrips + delta) * sizeof (uint32));
597	new_stripbytecount = (uint32*)_TIFFrealloc(td->td_stripbytecount,
598		(td->td_nstrips + delta) * sizeof (uint32));
599	if (new_stripoffset == NULL || new_stripbytecount == NULL) {
600		if (new_stripoffset)
601			_TIFFfree(new_stripoffset);
602		if (new_stripbytecount)
603			_TIFFfree(new_stripbytecount);
604		td->td_nstrips = 0;
605		TIFFErrorExt(tif->tif_clientdata, module, "%s: No space to expand strip arrays",
606			  tif->tif_name);
607		return (0);
608	}
609	td->td_stripoffset = new_stripoffset;
610	td->td_stripbytecount = new_stripbytecount;
611	_TIFFmemset(td->td_stripoffset + td->td_nstrips,
612		    0, delta*sizeof (uint32));
613	_TIFFmemset(td->td_stripbytecount + td->td_nstrips,
614		    0, delta*sizeof (uint32));
615	td->td_nstrips += delta;
616	return (1);
617}
618
619/*
620 * Append the data to the specified strip.
621 */
622static int
623TIFFAppendToStrip(TIFF* tif, tstrip_t strip, tidata_t data, tsize_t cc)
624{
625	static const char module[] = "TIFFAppendToStrip";
626	TIFFDirectory *td = &tif->tif_dir;
627
628	if (td->td_stripoffset[strip] == 0 || tif->tif_curoff == 0) {
629            assert(td->td_nstrips > 0);
630
631            if( td->td_stripbytecount[strip] != 0 
632                && td->td_stripoffset[strip] != 0 
633                && td->td_stripbytecount[strip] >= cc )
634            {
635                /* 
636                 * There is already tile data on disk, and the new tile
637                 * data we have to will fit in the same space.  The only 
638                 * aspect of this that is risky is that there could be
639                 * more data to append to this strip before we are done
640                 * depending on how we are getting called.
641                 */
642                if (!SeekOK(tif, td->td_stripoffset[strip])) {
643                    TIFFErrorExt(tif->tif_clientdata, module,
644                                 "Seek error at scanline %lu",
645                                 (unsigned long)tif->tif_row);
646                    return (0);
647                }
648            }
649            else
650            {
651                /* 
652                 * Seek to end of file, and set that as our location to 
653                 * write this strip.
654                 */
655                td->td_stripoffset[strip] = TIFFSeekFile(tif, 0, SEEK_END);
656            }
657
658            tif->tif_curoff = td->td_stripoffset[strip];
659
660            /*
661             * We are starting a fresh strip/tile, so set the size to zero.
662             */
663            td->td_stripbytecount[strip] = 0;
664	}
665
666	if (!WriteOK(tif, data, cc)) {
667		TIFFErrorExt(tif->tif_clientdata, module, "Write error at scanline %lu",
668		    (unsigned long) tif->tif_row);
669		    return (0);
670	}
671	tif->tif_curoff =  tif->tif_curoff+cc;
672	td->td_stripbytecount[strip] += cc;
673	return (1);
674}
675
676/*
677 * Internal version of TIFFFlushData that can be
678 * called by ``encodestrip routines'' w/o concern
679 * for infinite recursion.
680 */
681int
682TIFFFlushData1(TIFF* tif)
683{
684	if (tif->tif_rawcc > 0) {
685		if (!isFillOrder(tif, tif->tif_dir.td_fillorder) &&
686		    (tif->tif_flags & TIFF_NOBITREV) == 0)
687			TIFFReverseBits((unsigned char *)tif->tif_rawdata,
688			    tif->tif_rawcc);
689		if (!TIFFAppendToStrip(tif,
690		    isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip,
691		    tif->tif_rawdata, tif->tif_rawcc))
692			return (0);
693		tif->tif_rawcc = 0;
694		tif->tif_rawcp = tif->tif_rawdata;
695	}
696	return (1);
697}
698
699/*
700 * Set the current write offset.  This should only be
701 * used to set the offset to a known previous location
702 * (very carefully), or to 0 so that the next write gets
703 * appended to the end of the file.
704 */
705void
706TIFFSetWriteOffset(TIFF* tif, toff_t off)
707{
708	tif->tif_curoff = off;
709}
710
711/* vim: set ts=8 sts=8 sw=8 noet: */
712/*
713 * Local Variables:
714 * mode: c
715 * c-basic-offset: 8
716 * fill-column: 78
717 * End:
718 */