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src/Source/LibTIFF4/tif_dirread.c  view on Meta::CPAN

        /*
         * Mark duplicates of any tag to be ignored (bugzilla 1994)
         * to avoid certain pathological problems.
         */
	{
		TIFFDirEntry* ma;
		uint16 mb;
		for (ma=dir, mb=0; mb<dircount; ma++, mb++)
		{
			TIFFDirEntry* na;
			uint16 nb;
			for (na=ma+1, nb=mb+1; nb<dircount; na++, nb++)
			{
				if (ma->tdir_tag==na->tdir_tag)
					na->tdir_tag=IGNORE;
			}
		}
	}
        
	tif->tif_flags &= ~TIFF_BEENWRITING;    /* reset before new dir */
	tif->tif_flags &= ~TIFF_BUF4WRITE;      /* reset before new dir */
	/* free any old stuff and reinit */
	TIFFFreeDirectory(tif);
	TIFFDefaultDirectory(tif);
	/*
	 * Electronic Arts writes gray-scale TIFF files
	 * without a PlanarConfiguration directory entry.
	 * Thus we setup a default value here, even though
	 * the TIFF spec says there is no default value.
	 */
	TIFFSetField(tif,TIFFTAG_PLANARCONFIG,PLANARCONFIG_CONTIG);
	/*
	 * Setup default value and then make a pass over
	 * the fields to check type and tag information,
	 * and to extract info required to size data
	 * structures.  A second pass is made afterwards
	 * to read in everthing not taken in the first pass.
	 * But we must process the Compression tag first
	 * in order to merge in codec-private tag definitions (otherwise
	 * we may get complaints about unknown tags).  However, the
	 * Compression tag may be dependent on the SamplesPerPixel
	 * tag value because older TIFF specs permited Compression
	 * to be written as a SamplesPerPixel-count tag entry.
	 * Thus if we don't first figure out the correct SamplesPerPixel
	 * tag value then we may end up ignoring the Compression tag
	 * value because it has an incorrect count value (if the
	 * true value of SamplesPerPixel is not 1).
	 */
	dp=TIFFReadDirectoryFindEntry(tif,dir,dircount,TIFFTAG_SAMPLESPERPIXEL);
	if (dp)
	{
		if (!TIFFFetchNormalTag(tif,dp,0))
			goto bad;
		dp->tdir_tag=IGNORE;
	}
	dp=TIFFReadDirectoryFindEntry(tif,dir,dircount,TIFFTAG_COMPRESSION);
	if (dp)
	{
		/*
		 * The 5.0 spec says the Compression tag has one value, while
		 * earlier specs say it has one value per sample.  Because of
		 * this, we accept the tag if one value is supplied with either
		 * count.
		 */
		uint16 value;
		enum TIFFReadDirEntryErr err;
		err=TIFFReadDirEntryShort(tif,dp,&value);
		if (err==TIFFReadDirEntryErrCount)
			err=TIFFReadDirEntryPersampleShort(tif,dp,&value);
		if (err!=TIFFReadDirEntryErrOk)
		{
			TIFFReadDirEntryOutputErr(tif,err,module,"Compression",0);
			goto bad;
		}
		if (!TIFFSetField(tif,TIFFTAG_COMPRESSION,value))
			goto bad;
		dp->tdir_tag=IGNORE;
	}
	else
	{
		if (!TIFFSetField(tif,TIFFTAG_COMPRESSION,COMPRESSION_NONE))
			goto bad;
	}
	/*
	 * First real pass over the directory.
	 */
	for (di=0, dp=dir; di<dircount; di++, dp++)
	{
		if (dp->tdir_tag!=IGNORE)
		{
			TIFFReadDirectoryFindFieldInfo(tif,dp->tdir_tag,&fii);
			if (fii == FAILED_FII)
			{
				TIFFWarningExt(tif->tif_clientdata, module,
				    "Unknown field with tag %d (0x%x) encountered",
				    dp->tdir_tag,dp->tdir_tag);
                                /* the following knowingly leaks the 
                                   anonymous field structure */
				if (!_TIFFMergeFields(tif,
					_TIFFCreateAnonField(tif,
						dp->tdir_tag,
						(TIFFDataType) dp->tdir_type),
					1)) {
					TIFFWarningExt(tif->tif_clientdata,
					    module,
					    "Registering anonymous field with tag %d (0x%x) failed",
					    dp->tdir_tag,
					    dp->tdir_tag);
					dp->tdir_tag=IGNORE;
				} else {
					TIFFReadDirectoryFindFieldInfo(tif,dp->tdir_tag,&fii);
					assert(fii != FAILED_FII);
				}
			}
		}
		if (dp->tdir_tag!=IGNORE)
		{
			fip=tif->tif_fields[fii];
			if (fip->field_bit==FIELD_IGNORE)
				dp->tdir_tag=IGNORE;
			else