tif_dirwrite.c

奇趣公司比较新的qt/emd版本

/* $Id: tif_dirwrite.c,v 1.34 2006/02/23 16:07:45 dron Exp $ */

/*
 * Copyright (c) 1988-1997 Sam Leffler
 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 * 
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
 * 
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 */

/*
 * TIFF Library.
 *
 * Directory Write Support Routines.
 */
#include "tiffiop.h"

#ifdef HAVE_IEEEFP
# define	TIFFCvtNativeToIEEEFloat(tif, n, fp)
# define	TIFFCvtNativeToIEEEDouble(tif, n, dp)
#else
extern	void TIFFCvtNativeToIEEEFloat(TIFF*, uint32, float*);
extern	void TIFFCvtNativeToIEEEDouble(TIFF*, uint32, double*);
#endif

static	int TIFFWriteNormalTag(TIFF*, TIFFDirEntry*, const TIFFFieldInfo*);
static	void TIFFSetupShortLong(TIFF*, ttag_t, TIFFDirEntry*, uint32);
static	void TIFFSetupShort(TIFF*, ttag_t, TIFFDirEntry*, uint16);
static	int TIFFSetupShortPair(TIFF*, ttag_t, TIFFDirEntry*);
static	int TIFFWritePerSampleShorts(TIFF*, ttag_t, TIFFDirEntry*);
static	int TIFFWritePerSampleAnys(TIFF*, TIFFDataType, ttag_t, TIFFDirEntry*);
static	int TIFFWriteShortTable(TIFF*, ttag_t, TIFFDirEntry*, uint32, uint16**);
static	int TIFFWriteShortArray(TIFF*, TIFFDirEntry*, uint16*);
static	int TIFFWriteLongArray(TIFF *, TIFFDirEntry*, uint32*);
static	int TIFFWriteRationalArray(TIFF *, TIFFDirEntry*, float*);
static	int TIFFWriteFloatArray(TIFF *, TIFFDirEntry*, float*);
static	int TIFFWriteDoubleArray(TIFF *, TIFFDirEntry*, double*);
static	int TIFFWriteByteArray(TIFF*, TIFFDirEntry*, char*);
static	int TIFFWriteAnyArray(TIFF*,
	    TIFFDataType, ttag_t, TIFFDirEntry*, uint32, double*);
static	int TIFFWriteTransferFunction(TIFF*, TIFFDirEntry*);
static	int TIFFWriteInkNames(TIFF*, TIFFDirEntry*);
static	int TIFFWriteData(TIFF*, TIFFDirEntry*, char*);
static	int TIFFLinkDirectory(TIFF*);

#define	WriteRationalPair(type, tag1, v1, tag2, v2) {		\
	TIFFWriteRational((tif), (type), (tag1), (dir), (v1))	\
	TIFFWriteRational((tif), (type), (tag2), (dir)+1, (v2))	\
	(dir)++;						\
}
#define	TIFFWriteRational(tif, type, tag, dir, v)		\
	(dir)->tdir_tag = (tag);				\
	(dir)->tdir_type = (type);				\
	(dir)->tdir_count = 1;					\
	if (!TIFFWriteRationalArray((tif), (dir), &(v)))	\
		goto bad;

/*
 * Write the contents of the current directory
 * to the specified file.  This routine doesn't
 * handle overwriting a directory with auxiliary
 * storage that's been changed.
 */
static int
_TIFFWriteDirectory(TIFF* tif, int done)
{
	uint16 dircount;
	toff_t diroff;
	ttag_t tag;
	uint32 nfields;
	tsize_t dirsize;
	char* data;
	TIFFDirEntry* dir;
	TIFFDirectory* td;
	unsigned long b, fields[FIELD_SETLONGS];
	int fi, nfi;

	if (tif->tif_mode == O_RDONLY)
		return (1);
	/*
	 * Clear write state so that subsequent images with
	 * different characteristics get the right buffers
	 * setup for them.
	 */
	if (done)
	{
	    if (tif->tif_flags & TIFF_POSTENCODE) {
		    tif->tif_flags &= ~TIFF_POSTENCODE;
		    if (!(*tif->tif_postencode)(tif)) {
				TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
				"Error post-encoding before directory write");
			    return (0);
		    }
	    }
	    (*tif->tif_close)(tif);		/* shutdown encoder */
	    /*
	     * Flush any data that might have been written
	     * by the compression close+cleanup routines.
	     */
	    if (tif->tif_rawcc > 0 && !TIFFFlushData1(tif)) {
			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
			"Error flushing data before directory write");
		    return (0);
	    }
	    if ((tif->tif_flags & TIFF_MYBUFFER) && tif->tif_rawdata) {
		    _TIFFfree(tif->tif_rawdata);
		    tif->tif_rawdata = NULL;
		    tif->tif_rawcc = 0;
		    tif->tif_rawdatasize = 0;
	    }
	    tif->tif_flags &= ~(TIFF_BEENWRITING|TIFF_BUFFERSETUP);
	}

	td = &tif->tif_dir;
	/*
	 * Size the directory so that we can calculate
	 * offsets for the data items that aren't kept
	 * in-place in each field.
	 */
	nfields = 0;
	for (b = 0; b <= FIELD_LAST; b++)
		if (TIFFFieldSet(tif, b) && b != FIELD_CUSTOM)
			nfields += (b < FIELD_SUBFILETYPE ? 2 : 1);
        nfields += td->td_customValueCount;
	dirsize = nfields * sizeof (TIFFDirEntry);
	data = (char*) _TIFFmalloc(dirsize);
	if (data == NULL) {
		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
		    "Cannot write directory, out of space");
		return (0);
	}
	/*
	 * Directory hasn't been placed yet, put
	 * it at the end of the file and link it
	 * into the existing directory structure.
	 */
	if (tif->tif_diroff == 0 && !TIFFLinkDirectory(tif))
		goto bad;
	tif->tif_dataoff = (toff_t)(
	    tif->tif_diroff + sizeof (uint16) + dirsize + sizeof (toff_t));
	if (tif->tif_dataoff & 1)
		tif->tif_dataoff++;
	(void) TIFFSeekFile(tif, tif->tif_dataoff, SEEK_SET);
	tif->tif_curdir++;
	dir = (TIFFDirEntry*) data;
	/*
	 * Setup external form of directory
	 * entries and write data items.
	 */
	_TIFFmemcpy(fields, td->td_fieldsset, sizeof (fields));
	/*
	 * Write out ExtraSamples tag only if
	 * extra samples are present in the data.
	 */
	if (FieldSet(fields, FIELD_EXTRASAMPLES) && !td->td_extrasamples) {
		ResetFieldBit(fields, FIELD_EXTRASAMPLES);
		nfields--;
		dirsize -= sizeof (TIFFDirEntry);
	}								/*XXX*/
	for (fi = 0, nfi = tif->tif_nfields; nfi > 0; nfi--, fi++) {
		const TIFFFieldInfo* fip = tif->tif_fieldinfo[fi];

                /*
                ** For custom fields, we test to see if the custom field
                ** is set or not.  For normal fields, we just use the
                ** FieldSet test. 
                */
                if( fip->field_bit == FIELD_CUSTOM )
                {
                    int ci, is_set = FALSE;

                    for( ci = 0; ci < td->td_customValueCount; ci++ )
                        is_set |= (td->td_customValues[ci].info == fip);

                    if( !is_set )
                        continue;
                }
		else if (!FieldSet(fields, fip->field_bit))
                    continue;


                /*
                ** Handle other fields.
                */
		switch (fip->field_bit)
                {
		case FIELD_STRIPOFFSETS:
			/*
			 * We use one field bit for both strip and tile

			 * offsets, and so must be careful in selecting
			 * the appropriate field descriptor (so that tags
			 * are written in sorted order).
			 */
			tag = isTiled(tif) ?
			    TIFFTAG_TILEOFFSETS : TIFFTAG_STRIPOFFSETS;
			if (tag != fip->field_tag)
				continue;
			
			dir->tdir_tag = (uint16) tag;
			dir->tdir_type = (uint16) TIFF_LONG;
			dir->tdir_count = (uint32) td->td_nstrips;
			if (!TIFFWriteLongArray(tif, dir, td->td_stripoffset))
				goto bad;
			break;
		case FIELD_STRIPBYTECOUNTS:
			/*
			 * We use one field bit for both strip and tile
			 * byte counts, and so must be careful in selecting
			 * the appropriate field descriptor (so that tags
			 * are written in sorted order).
			 */
			tag = isTiled(tif) ?
			    TIFFTAG_TILEBYTECOUNTS : TIFFTAG_STRIPBYTECOUNTS;
			if (tag != fip->field_tag)
				continue;
			
			dir->tdir_tag = (uint16) tag;
			dir->tdir_type = (uint16) TIFF_LONG;
			dir->tdir_count = (uint32) td->td_nstrips;
			if (!TIFFWriteLongArray(tif, dir,
						td->td_stripbytecount))
				goto bad;
			break;
		case FIELD_ROWSPERSTRIP:
			TIFFSetupShortLong(tif, TIFFTAG_ROWSPERSTRIP,
			    dir, td->td_rowsperstrip);
			break;
		case FIELD_COLORMAP:
			if (!TIFFWriteShortTable(tif, TIFFTAG_COLORMAP, dir,
			    3, td->td_colormap))
				goto bad;
			break;
		case FIELD_IMAGEDIMENSIONS:
			TIFFSetupShortLong(tif, TIFFTAG_IMAGEWIDTH,
			    dir++, td->td_imagewidth);
			TIFFSetupShortLong(tif, TIFFTAG_IMAGELENGTH,
			    dir, td->td_imagelength);
			break;
		case FIELD_TILEDIMENSIONS:
			TIFFSetupShortLong(tif, TIFFTAG_TILEWIDTH,
			    dir++, td->td_tilewidth);
			TIFFSetupShortLong(tif, TIFFTAG_TILELENGTH,
			    dir, td->td_tilelength);
			break;
		case FIELD_COMPRESSION:
			TIFFSetupShort(tif, TIFFTAG_COMPRESSION,
			    dir, td->td_compression);
			break;
		case FIELD_PHOTOMETRIC:
			TIFFSetupShort(tif, TIFFTAG_PHOTOMETRIC,
			    dir, td->td_photometric);
			break;
		case FIELD_POSITION:
			WriteRationalPair(TIFF_RATIONAL,
			    TIFFTAG_XPOSITION, td->td_xposition,
			    TIFFTAG_YPOSITION, td->td_yposition);
			break;
		case FIELD_RESOLUTION:
			WriteRationalPair(TIFF_RATIONAL,
			    TIFFTAG_XRESOLUTION, td->td_xresolution,
			    TIFFTAG_YRESOLUTION, td->td_yresolution);
			break;
		case FIELD_BITSPERSAMPLE:
		case FIELD_MINSAMPLEVALUE:
		case FIELD_MAXSAMPLEVALUE:
		case FIELD_SAMPLEFORMAT:
			if (!TIFFWritePerSampleShorts(tif, fip->field_tag, dir))
				goto bad;
			break;
		case FIELD_SMINSAMPLEVALUE:
		case FIELD_SMAXSAMPLEVALUE:
			if (!TIFFWritePerSampleAnys(tif,
			    _TIFFSampleToTagType(tif), fip->field_tag, dir))
				goto bad;
			break;
		case FIELD_PAGENUMBER:
		case FIELD_HALFTONEHINTS:
		case FIELD_YCBCRSUBSAMPLING:
			if (!TIFFSetupShortPair(tif, fip->field_tag, dir))
				goto bad;
			break;
		case FIELD_INKNAMES:
			if (!TIFFWriteInkNames(tif, dir))
				goto bad;
			break;
		case FIELD_TRANSFERFUNCTION:
			if (!TIFFWriteTransferFunction(tif, dir))
				goto bad;
			break;
		case FIELD_SUBIFD:
			/*
			 * XXX: Always write this field using LONG type
			 * for backward compatibility.
			 */
			dir->tdir_tag = (uint16) fip->field_tag;
			dir->tdir_type = (uint16) TIFF_LONG;
			dir->tdir_count = (uint32) td->td_nsubifd;
			if (!TIFFWriteLongArray(tif, dir, td->td_subifd))
				goto bad;
			/*
			 * Total hack: if this directory includes a SubIFD
			 * tag then force the next <n> directories to be
			 * written as ``sub directories'' of this one.  This
			 * is used to write things like thumbnails and
			 * image masks that one wants to keep out of the
			 * normal directory linkage access mechanism.
			 */
			if (dir->tdir_count > 0) {
				tif->tif_flags |= TIFF_INSUBIFD;
				tif->tif_nsubifd = (uint16) dir->tdir_count;
				if (dir->tdir_count > 1)
					tif->tif_subifdoff = dir->tdir_offset;
				else
					tif->tif_subifdoff = (uint32)(
					      tif->tif_diroff
					    + sizeof (uint16)
					    + ((char*)&dir->tdir_offset-data));
			}
			break;
		default:
			/* XXX: Should be fixed and removed. */
			if (fip->field_tag == TIFFTAG_DOTRANGE) {
				if (!TIFFSetupShortPair(tif, fip->field_tag, dir))
					goto bad;
			}
			else if (!TIFFWriteNormalTag(tif, dir, fip))
				goto bad;
			break;
		}
		dir++;
                
                if( fip->field_bit != FIELD_CUSTOM )
                    ResetFieldBit(fields, fip->field_bit);
	}

	/*
	 * Write directory.
	 */
	dircount = (uint16) nfields;
	diroff = (uint32) tif->tif_nextdiroff;
	if (tif->tif_flags & TIFF_SWAB) {
		/*
		 * The file's byte order is opposite to the
		 * native machine architecture.  We overwrite
		 * the directory information with impunity
		 * because it'll be released below after we
		 * write it to the file.  Note that all the
		 * other tag construction routines assume that
		 * we do this byte-swapping; i.e. they only
		 * byte-swap indirect data.
		 */
		for (dir = (TIFFDirEntry*) data; dircount; dir++, dircount--) {
			TIFFSwabArrayOfShort(&dir->tdir_tag, 2);
			TIFFSwabArrayOfLong(&dir->tdir_count, 2);
		}
		dircount = (uint16) nfields;
		TIFFSwabShort(&dircount);
		TIFFSwabLong(&diroff);
	}
	(void) TIFFSeekFile(tif, tif->tif_diroff, SEEK_SET);
	if (!WriteOK(tif, &dircount, sizeof (dircount))) {
		TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Error writing directory count");
		goto bad;
	}
	if (!WriteOK(tif, data, dirsize)) {
		TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Error writing directory contents");
		goto bad;
	}
	if (!WriteOK(tif, &diroff, sizeof (diroff))) {
		TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Error writing directory link");
		goto bad;
	}
	if (done) {
		TIFFFreeDirectory(tif);
		tif->tif_flags &= ~TIFF_DIRTYDIRECT;
		(*tif->tif_cleanup)(tif);

		/*
		* Reset directory-related state for subsequent
		* directories.
		*/
		TIFFCreateDirectory(tif);
	}
	_TIFFfree(data);
	return (1);
bad:
	_TIFFfree(data);
	return (0);
}
#undef WriteRationalPair

int
TIFFWriteDirectory(TIFF* tif)
{
	return _TIFFWriteDirectory(tif, TRUE);
}

/*