Removed the libs directory containing win32 compiled versions of libpng, libtiff and liblcms. Added a thirdparty directory to include main source files of libtiff, libpng, libz and liblcms to enable support of these formats in the codec executables. CMake will try to statically build these libraries if they are not found on the system. Note that these third party libraries are not required to build libopenjpeg (which has no dependencies).

1 files changed, 1389 insertions, 0 deletions

diff --git a/thirdparty/libtiff/tif_dir.c b/thirdparty/libtiff/tif_dir.c
new file mode 100644
index 00000000..ac44b381
--- /dev/null
+++ b/thirdparty/libtiff/tif_dir.c
@@ -0,0 +1,1389 @@
+/* $Id: tif_dir.c,v 1.75.2.5 2010-06-09 21:15:27 bfriesen 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 Tag Get & Set Routines.
+ * (and also some miscellaneous stuff)
+ */
+#include "tiffiop.h"
+
+/*
+ * These are used in the backwards compatibility code...
+ */
+#define DATATYPE_VOID		0       /* !untyped data */
+#define DATATYPE_INT		1       /* !signed integer data */
+#define DATATYPE_UINT		2       /* !unsigned integer data */
+#define DATATYPE_IEEEFP		3       /* !IEEE floating point data */
+
+static void
+setByteArray(void** vpp, void* vp, size_t nmemb, size_t elem_size)
+{
+	if (*vpp)
+		_TIFFfree(*vpp), *vpp = 0;
+	if (vp) {
+		tsize_t	bytes = nmemb * elem_size;
+		if (elem_size && bytes / elem_size == nmemb)
+			*vpp = (void*) _TIFFmalloc(bytes);
+		if (*vpp)
+			_TIFFmemcpy(*vpp, vp, bytes);
+	}
+}
+void _TIFFsetByteArray(void** vpp, void* vp, uint32 n)
+    { setByteArray(vpp, vp, n, 1); }
+void _TIFFsetString(char** cpp, char* cp)
+    { setByteArray((void**) cpp, (void*) cp, strlen(cp)+1, 1); }
+void _TIFFsetNString(char** cpp, char* cp, uint32 n)
+    { setByteArray((void**) cpp, (void*) cp, n, 1); }
+void _TIFFsetShortArray(uint16** wpp, uint16* wp, uint32 n)
+    { setByteArray((void**) wpp, (void*) wp, n, sizeof (uint16)); }
+void _TIFFsetLongArray(uint32** lpp, uint32* lp, uint32 n)
+    { setByteArray((void**) lpp, (void*) lp, n, sizeof (uint32)); }
+void _TIFFsetFloatArray(float** fpp, float* fp, uint32 n)
+    { setByteArray((void**) fpp, (void*) fp, n, sizeof (float)); }
+void _TIFFsetDoubleArray(double** dpp, double* dp, uint32 n)
+    { setByteArray((void**) dpp, (void*) dp, n, sizeof (double)); }
+
+/*
+ * Install extra samples information.
+ */
+static int
+setExtraSamples(TIFFDirectory* td, va_list ap, uint32* v)
+{
+/* XXX: Unassociated alpha data == 999 is a known Corel Draw bug, see below */
+#define EXTRASAMPLE_COREL_UNASSALPHA 999 
+
+	uint16* va;
+	uint32 i;
+
+	*v = va_arg(ap, uint32);
+	if ((uint16) *v > td->td_samplesperpixel)
+		return 0;
+	va = va_arg(ap, uint16*);
+	if (*v > 0 && va == NULL)		/* typically missing param */
+		return 0;
+	for (i = 0; i < *v; i++) {
+		if (va[i] > EXTRASAMPLE_UNASSALPHA) {
+			/*
+			 * XXX: Corel Draw is known to produce incorrect
+			 * ExtraSamples tags which must be patched here if we
+			 * want to be able to open some of the damaged TIFF
+			 * files: 
+			 */
+			if (va[i] == EXTRASAMPLE_COREL_UNASSALPHA)
+				va[i] = EXTRASAMPLE_UNASSALPHA;
+			else
+				return 0;
+		}
+	}
+	td->td_extrasamples = (uint16) *v;
+	_TIFFsetShortArray(&td->td_sampleinfo, va, td->td_extrasamples);
+	return 1;
+
+#undef EXTRASAMPLE_COREL_UNASSALPHA
+}
+
+static uint32
+checkInkNamesString(TIFF* tif, uint32 slen, const char* s)
+{
+	TIFFDirectory* td = &tif->tif_dir;
+	uint16 i = td->td_samplesperpixel;
+
+	if (slen > 0) {
+		const char* ep = s+slen;
+		const char* cp = s;
+		for (; i > 0; i--) {
+			for (; *cp != '\0'; cp++)
+				if (cp >= ep)
+					goto bad;
+			cp++;				/* skip \0 */
+		}
+		return (cp-s);
+	}
+bad:
+	TIFFErrorExt(tif->tif_clientdata, "TIFFSetField",
+	    "%s: Invalid InkNames value; expecting %d names, found %d",
+	    tif->tif_name,
+	    td->td_samplesperpixel,
+	    td->td_samplesperpixel-i);
+	return (0);
+}
+
+static int
+_TIFFVSetField(TIFF* tif, ttag_t tag, va_list ap)
+{
+	static const char module[] = "_TIFFVSetField";
+
+	TIFFDirectory* td = &tif->tif_dir;
+	int status = 1;
+	uint32 v32, i, v;
+	char* s;
+
+	switch (tag) {
+	case TIFFTAG_SUBFILETYPE:
+		td->td_subfiletype = va_arg(ap, uint32);
+		break;
+	case TIFFTAG_IMAGEWIDTH:
+		td->td_imagewidth = va_arg(ap, uint32);
+		break;
+	case TIFFTAG_IMAGELENGTH:
+		td->td_imagelength = va_arg(ap, uint32);
+		break;
+	case TIFFTAG_BITSPERSAMPLE:
+		td->td_bitspersample = (uint16) va_arg(ap, int);
+		/*
+		 * If the data require post-decoding processing to byte-swap
+		 * samples, set it up here.  Note that since tags are required
+		 * to be ordered, compression code can override this behaviour
+		 * in the setup method if it wants to roll the post decoding
+		 * work in with its normal work.
+		 */
+		if (tif->tif_flags & TIFF_SWAB) {
+			if (td->td_bitspersample == 16)
+				tif->tif_postdecode = _TIFFSwab16BitData;
+			else if (td->td_bitspersample == 24)
+				tif->tif_postdecode = _TIFFSwab24BitData;
+			else if (td->td_bitspersample == 32)
+				tif->tif_postdecode = _TIFFSwab32BitData;
+			else if (td->td_bitspersample == 64)
+				tif->tif_postdecode = _TIFFSwab64BitData;
+			else if (td->td_bitspersample == 128) /* two 64's */
+				tif->tif_postdecode = _TIFFSwab64BitData;
+		}
+		break;
+	case TIFFTAG_COMPRESSION:
+		v = va_arg(ap, uint32) & 0xffff;
+		/*
+		 * If we're changing the compression scheme, the notify the
+		 * previous module so that it can cleanup any state it's
+		 * setup.
+		 */
+		if (TIFFFieldSet(tif, FIELD_COMPRESSION)) {
+			if (td->td_compression == v)
+				break;
+			(*tif->tif_cleanup)(tif);
+			tif->tif_flags &= ~TIFF_CODERSETUP;
+		}
+		/*
+		 * Setup new compression routine state.
+		 */
+		if( (status = TIFFSetCompressionScheme(tif, v)) != 0 )
+                    td->td_compression = (uint16) v;
+                else
+                    status = 0;
+		break;
+	case TIFFTAG_PHOTOMETRIC:
+		td->td_photometric = (uint16) va_arg(ap, int);
+		break;
+	case TIFFTAG_THRESHHOLDING:
+		td->td_threshholding = (uint16) va_arg(ap, int);
+		break;
+	case TIFFTAG_FILLORDER:
+		v = va_arg(ap, uint32);
+		if (v != FILLORDER_LSB2MSB && v != FILLORDER_MSB2LSB)
+			goto badvalue;
+		td->td_fillorder = (uint16) v;
+		break;
+	case TIFFTAG_ORIENTATION:
+		v = va_arg(ap, uint32);
+		if (v < ORIENTATION_TOPLEFT || ORIENTATION_LEFTBOT < v)
+			goto badvalue;
+		else
+			td->td_orientation = (uint16) v;
+		break;
+	case TIFFTAG_SAMPLESPERPIXEL:
+		/* XXX should cross check -- e.g. if pallette, then 1 */
+		v = va_arg(ap, uint32);
+		if (v == 0)
+			goto badvalue;
+		td->td_samplesperpixel = (uint16) v;
+		break;
+	case TIFFTAG_ROWSPERSTRIP:
+		v32 = va_arg(ap, uint32);
+		if (v32 == 0)
+			goto badvalue32;
+		td->td_rowsperstrip = v32;
+		if (!TIFFFieldSet(tif, FIELD_TILEDIMENSIONS)) {
+			td->td_tilelength = v32;
+			td->td_tilewidth = td->td_imagewidth;
+		}
+		break;
+	case TIFFTAG_MINSAMPLEVALUE:
+		td->td_minsamplevalue = (uint16) va_arg(ap, int);
+		break;
+	case TIFFTAG_MAXSAMPLEVALUE:
+		td->td_maxsamplevalue = (uint16) va_arg(ap, int);
+		break;
+	case TIFFTAG_SMINSAMPLEVALUE:
+		td->td_sminsamplevalue = va_arg(ap, double);
+		break;
+	case TIFFTAG_SMAXSAMPLEVALUE:
+		td->td_smaxsamplevalue = va_arg(ap, double);
+		break;
+	case TIFFTAG_XRESOLUTION:
+		td->td_xresolution = (float) va_arg(ap, double);
+		break;
+	case TIFFTAG_YRESOLUTION:
+		td->td_yresolution = (float) va_arg(ap, double);
+		break;
+	case TIFFTAG_PLANARCONFIG:
+		v = va_arg(ap, uint32);
+		if (v != PLANARCONFIG_CONTIG && v != PLANARCONFIG_SEPARATE)
+			goto badvalue;
+		td->td_planarconfig = (uint16) v;
+		break;
+	case TIFFTAG_XPOSITION:
+		td->td_xposition = (float) va_arg(ap, double);
+		break;
+	case TIFFTAG_YPOSITION:
+		td->td_yposition = (float) va_arg(ap, double);
+		break;
+	case TIFFTAG_RESOLUTIONUNIT:
+		v = va_arg(ap, uint32);
+		if (v < RESUNIT_NONE || RESUNIT_CENTIMETER < v)
+			goto badvalue;
+		td->td_resolutionunit = (uint16) v;
+		break;
+	case TIFFTAG_PAGENUMBER:
+		td->td_pagenumber[0] = (uint16) va_arg(ap, int);
+		td->td_pagenumber[1] = (uint16) va_arg(ap, int);
+		break;
+	case TIFFTAG_HALFTONEHINTS:
+		td->td_halftonehints[0] = (uint16) va_arg(ap, int);
+		td->td_halftonehints[1] = (uint16) va_arg(ap, int);
+		break;
+	case TIFFTAG_COLORMAP:
+		v32 = (uint32)(1L<<td->td_bitspersample);
+		_TIFFsetShortArray(&td->td_colormap[0], va_arg(ap, uint16*), v32);
+		_TIFFsetShortArray(&td->td_colormap[1], va_arg(ap, uint16*), v32);
+		_TIFFsetShortArray(&td->td_colormap[2], va_arg(ap, uint16*), v32);
+		break;
+	case TIFFTAG_EXTRASAMPLES:
+		if (!setExtraSamples(td, ap, &v))
+			goto badvalue;
+		break;
+	case TIFFTAG_MATTEING:
+		td->td_extrasamples = (uint16) (va_arg(ap, int) != 0);
+		if (td->td_extrasamples) {
+			uint16 sv = EXTRASAMPLE_ASSOCALPHA;
+			_TIFFsetShortArray(&td->td_sampleinfo, &sv, 1);
+		}
+		break;
+	case TIFFTAG_TILEWIDTH:
+		v32 = va_arg(ap, uint32);
+		if (v32 % 16) {
+			if (tif->tif_mode != O_RDONLY)
+				goto badvalue32;
+			TIFFWarningExt(tif->tif_clientdata, tif->tif_name,
+				"Nonstandard tile width %d, convert file", v32);
+		}
+		td->td_tilewidth = v32;
+		tif->tif_flags |= TIFF_ISTILED;
+		break;
+	case TIFFTAG_TILELENGTH:
+		v32 = va_arg(ap, uint32);
+		if (v32 % 16) {
+			if (tif->tif_mode != O_RDONLY)
+				goto badvalue32;
+			TIFFWarningExt(tif->tif_clientdata, tif->tif_name,
+			    "Nonstandard tile length %d, convert file", v32);
+		}
+		td->td_tilelength = v32;
+		tif->tif_flags |= TIFF_ISTILED;
+		break;
+	case TIFFTAG_TILEDEPTH:
+		v32 = va_arg(ap, uint32);
+		if (v32 == 0)
+			goto badvalue32;
+		td->td_tiledepth = v32;
+		break;
+	case TIFFTAG_DATATYPE:
+		v = va_arg(ap, uint32);
+		switch (v) {
+		case DATATYPE_VOID:	v = SAMPLEFORMAT_VOID;	break;
+		case DATATYPE_INT:	v = SAMPLEFORMAT_INT;	break;
+		case DATATYPE_UINT:	v = SAMPLEFORMAT_UINT;	break;
+		case DATATYPE_IEEEFP:	v = SAMPLEFORMAT_IEEEFP;break;
+		default:		goto badvalue;
+		}
+		td->td_sampleformat = (uint16) v;
+		break;
+	case TIFFTAG_SAMPLEFORMAT:
+		v = va_arg(ap, uint32);
+		if (v < SAMPLEFORMAT_UINT || SAMPLEFORMAT_COMPLEXIEEEFP < v)
+			goto badvalue;
+		td->td_sampleformat = (uint16) v;
+
+                /*  Try to fix up the SWAB function for complex data. */
+                if( td->td_sampleformat == SAMPLEFORMAT_COMPLEXINT 
+                    && td->td_bitspersample == 32
+                    && tif->tif_postdecode == _TIFFSwab32BitData )
+                    tif->tif_postdecode = _TIFFSwab16BitData;
+                else if( (td->td_sampleformat == SAMPLEFORMAT_COMPLEXINT 
+                          || td->td_sampleformat == SAMPLEFORMAT_COMPLEXIEEEFP)
+                         && td->td_bitspersample == 64
+                         && tif->tif_postdecode == _TIFFSwab64BitData )
+                    tif->tif_postdecode = _TIFFSwab32BitData;
+		break;
+	case TIFFTAG_IMAGEDEPTH:
+		td->td_imagedepth = va_arg(ap, uint32);
+		break;
+	case TIFFTAG_SUBIFD:
+		if ((tif->tif_flags & TIFF_INSUBIFD) == 0) {
+			td->td_nsubifd = (uint16) va_arg(ap, int);
+			_TIFFsetLongArray(&td->td_subifd, va_arg(ap, uint32*),
+			    (long) td->td_nsubifd);
+		} else {
+			TIFFErrorExt(tif->tif_clientdata, module,
+				     "%s: Sorry, cannot nest SubIFDs",
+				     tif->tif_name);
+			status = 0;
+		}
+		break;
+	case TIFFTAG_YCBCRPOSITIONING:
+		td->td_ycbcrpositioning = (uint16) va_arg(ap, int);
+		break;
+	case TIFFTAG_YCBCRSUBSAMPLING:
+		td->td_ycbcrsubsampling[0] = (uint16) va_arg(ap, int);
+		td->td_ycbcrsubsampling[1] = (uint16) va_arg(ap, int);
+		break;
+	case TIFFTAG_TRANSFERFUNCTION:
+		v = (td->td_samplesperpixel - td->td_extrasamples) > 1 ? 3 : 1;
+		for (i = 0; i < v; i++)
+			_TIFFsetShortArray(&td->td_transferfunction[i],
+			    va_arg(ap, uint16*), 1L<<td->td_bitspersample);
+		break;
+	case TIFFTAG_REFERENCEBLACKWHITE:
+		/* XXX should check for null range */
+		_TIFFsetFloatArray(&td->td_refblackwhite, va_arg(ap, float*), 6);
+		break;
+	case TIFFTAG_INKNAMES:
+		v = va_arg(ap, uint32);
+		s = va_arg(ap, char*);
+		v = checkInkNamesString(tif, v, s);
+                status = v > 0;
+		if( v > 0 ) {
+			_TIFFsetNString(&td->td_inknames, s, v);
+			td->td_inknameslen = v;
+		}
+		break;
+        default: {
+            TIFFTagValue *tv;
+            int tv_size, iCustom;
+	    const TIFFFieldInfo* fip = _TIFFFindFieldInfo(tif, tag, TIFF_ANY);
+
+            /*
+	     * This can happen if multiple images are open with different
+	     * codecs which have private tags.  The global tag information
+	     * table may then have tags that are valid for one file but not
+	     * the other. If the client tries to set a tag that is not valid
+	     * for the image's codec then we'll arrive here.  This
+	     * happens, for example, when tiffcp is used to convert between
+	     * compression schemes and codec-specific tags are blindly copied.
+             */
+            if(fip == NULL || fip->field_bit != FIELD_CUSTOM) {
+		TIFFErrorExt(tif->tif_clientdata, module,
+			     "%s: Invalid %stag \"%s\" (not supported by codec)",
+			     tif->tif_name, isPseudoTag(tag) ? "pseudo-" : "",
+			     fip ? fip->field_name : "Unknown");
+		status = 0;
+		break;
+            }
+
+            /*
+             * Find the existing entry for this custom value.
+             */
+            tv = NULL;
+            for (iCustom = 0; iCustom < td->td_customValueCount; iCustom++) {
+		    if (td->td_customValues[iCustom].info->field_tag == tag) {
+			    tv = td->td_customValues + iCustom;
+			    if (tv->value != NULL) {
+				    _TIFFfree(tv->value);
+				    tv->value = NULL;
+			    }
+			    break;
+		    }
+            }
+
+            /*
+             * Grow the custom list if the entry was not found.
+             */
+            if(tv == NULL) {
+		TIFFTagValue	*new_customValues;
+		
+		td->td_customValueCount++;
+		new_customValues = (TIFFTagValue *)
+			_TIFFrealloc(td->td_customValues,
+				     sizeof(TIFFTagValue) * td->td_customValueCount);
+		if (!new_customValues) {
+			TIFFErrorExt(tif->tif_clientdata, module,
+		"%s: Failed to allocate space for list of custom values",
+				  tif->tif_name);
+			status = 0;
+			goto end;
+		}
+
+		td->td_customValues = new_customValues;
+
+                tv = td->td_customValues + (td->td_customValueCount - 1);
+                tv->info = fip;
+                tv->value = NULL;
+                tv->count = 0;
+            }
+
+            /*
+             * Set custom value ... save a copy of the custom tag value.
+             */
+	    tv_size = _TIFFDataSize(fip->field_type);
+	    if (tv_size == 0) {
+		    status = 0;
+		    TIFFErrorExt(tif->tif_clientdata, module,
+				 "%s: Bad field type %d for \"%s\"",
+				 tif->tif_name, fip->field_type,
+				 fip->field_name);
+		    goto end;
+	    }
+           
+            if(fip->field_passcount) {
+		    if (fip->field_writecount == TIFF_VARIABLE2)
+			tv->count = (uint32) va_arg(ap, uint32);
+		    else
+			tv->count = (int) va_arg(ap, int);
+	    } else if (fip->field_writecount == TIFF_VARIABLE
+		       || fip->field_writecount == TIFF_VARIABLE2)
+		tv->count = 1;
+	    else if (fip->field_writecount == TIFF_SPP)
+		tv->count = td->td_samplesperpixel;
+	    else
+                tv->count = fip->field_writecount;
+            
+    
+	    if (fip->field_type == TIFF_ASCII)
+		    _TIFFsetString((char **)&tv->value, va_arg(ap, char *));
+	    else {
+		tv->value = _TIFFCheckMalloc(tif, tv_size, tv->count,
+					     "Tag Value");
+		if (!tv->value) {
+		    status = 0;
+		    goto end;
+		}
+
+		if ((fip->field_passcount
+		    || fip->field_writecount == TIFF_VARIABLE
+		    || fip->field_writecount == TIFF_VARIABLE2
+		    || fip->field_writecount == TIFF_SPP
+		    || tv->count > 1)
+		    && fip->field_tag != TIFFTAG_PAGENUMBER
+		    && fip->field_tag != TIFFTAG_HALFTONEHINTS
+		    && fip->field_tag != TIFFTAG_YCBCRSUBSAMPLING
+		    && fip->field_tag != TIFFTAG_DOTRANGE) {
+                    _TIFFmemcpy(tv->value, va_arg(ap, void *),
+				tv->count * tv_size);
+		} else {
+		    /*
+		     * XXX: The following loop required to handle
+		     * TIFFTAG_PAGENUMBER, TIFFTAG_HALFTONEHINTS,
+		     * TIFFTAG_YCBCRSUBSAMPLING and TIFFTAG_DOTRANGE tags.
+		     * These tags are actually arrays and should be passed as
+		     * array pointers to TIFFSetField() function, but actually
+		     * passed as a list of separate values. This behaviour
+		     * must be changed in the future!
+		     */
+		    int i;
+		    char *val = (char *)tv->value;
+
+		    for (i = 0; i < tv->count; i++, val += tv_size) {
+			    switch (fip->field_type) {
+				case TIFF_BYTE:
+				case TIFF_UNDEFINED:
+				    {
+					uint8 v = (uint8)va_arg(ap, int);
+					_TIFFmemcpy(val, &v, tv_size);
+				    }
+				    break;
+				case TIFF_SBYTE:
+				    {
+					int8 v = (int8)va_arg(ap, int);
+					_TIFFmemcpy(val, &v, tv_size);
+				    }
+				    break;
+				case TIFF_SHORT:
+				    {
+					uint16 v = (uint16)va_arg(ap, int);
+					_TIFFmemcpy(val, &v, tv_size);
+				    }
+				    break;
+				case TIFF_SSHORT:
+				    {
+					int16 v = (int16)va_arg(ap, int);
+					_TIFFmemcpy(val, &v, tv_size);
+				    }
+				    break;
+				case TIFF_LONG:
+				case TIFF_IFD:
+				    {
+					uint32 v = va_arg(ap, uint32);
+					_TIFFmemcpy(val, &v, tv_size);
+				    }
+				    break;
+				case TIFF_SLONG:
+				    {
+					int32 v = va_arg(ap, int32);
+					_TIFFmemcpy(val, &v, tv_size);
+				    }
+				    break;
+				case TIFF_RATIONAL:
+				case TIFF_SRATIONAL:
+				case TIFF_FLOAT:
+				    {
+					float v = (float)va_arg(ap, double);
+					_TIFFmemcpy(val, &v, tv_size);
+				    }
+				    break;
+				case TIFF_DOUBLE:
+				    {
+					double v = va_arg(ap, double);
+					_TIFFmemcpy(val, &v, tv_size);
+				    }
+				    break;
+				default:
+				    _TIFFmemset(val, 0, tv_size);
+				    status = 0;
+				    break;
+			    }
+		    }
+		}
+	    }
+          }
+	}
+	if (status) {
+		TIFFSetFieldBit(tif, _TIFFFieldWithTag(tif, tag)->field_bit);
+		tif->tif_flags |= TIFF_DIRTYDIRECT;
+	}
+
+end:
+	va_end(ap);
+	return (status);
+badvalue:
+	TIFFErrorExt(tif->tif_clientdata, module,
+		     "%s: Bad value %d for \"%s\" tag",
+		     tif->tif_name, v,
+		     _TIFFFieldWithTag(tif, tag)->field_name);
+	va_end(ap);
+	return (0);
+badvalue32:
+	TIFFErrorExt(tif->tif_clientdata, module,
+		     "%s: Bad value %u for \"%s\" tag",
+		     tif->tif_name, v32,
+		     _TIFFFieldWithTag(tif, tag)->field_name);
+	va_end(ap);
+	return (0);
+}
+
+/*
+ * Return 1/0 according to whether or not
+ * it is permissible to set the tag's value.
+ * Note that we allow ImageLength to be changed
+ * so that we can append and extend to images.
+ * Any other tag may not be altered once writing
+ * has commenced, unless its value has no effect
+ * on the format of the data that is written.
+ */
+static int
+OkToChangeTag(TIFF* tif, ttag_t tag)
+{
+	const TIFFFieldInfo* fip = _TIFFFindFieldInfo(tif, tag, TIFF_ANY);
+	if (!fip) {			/* unknown tag */
+		TIFFErrorExt(tif->tif_clientdata, "TIFFSetField", "%s: Unknown %stag %u",
+		    tif->tif_name, isPseudoTag(tag) ? "pseudo-" : "", tag);
+		return (0);
+	}
+	if (tag != TIFFTAG_IMAGELENGTH && (tif->tif_flags & TIFF_BEENWRITING) &&
+	    !fip->field_oktochange) {
+		/*
+		 * Consult info table to see if tag can be changed
+		 * after we've started writing.  We only allow changes
+		 * to those tags that don't/shouldn't affect the
+		 * compression and/or format of the data.
+		 */
+		TIFFErrorExt(tif->tif_clientdata, "TIFFSetField",
+		    "%s: Cannot modify tag \"%s\" while writing",
+		    tif->tif_name, fip->field_name);
+		return (0);
+	}
+	return (1);
+}
+
+/*
+ * Record the value of a field in the
+ * internal directory structure.  The
+ * field will be written to the file
+ * when/if the directory structure is
+ * updated.
+ */
+int
+TIFFSetField(TIFF* tif, ttag_t tag, ...)
+{
+	va_list ap;
+	int status;
+
+	va_start(ap, tag);
+	status = TIFFVSetField(tif, tag, ap);
+	va_end(ap);
+	return (status);
+}
+
+/*
+ * Like TIFFSetField, but taking a varargs
+ * parameter list.  This routine is useful
+ * for building higher-level interfaces on
+ * top of the library.
+ */
+int
+TIFFVSetField(TIFF* tif, ttag_t tag, va_list ap)
+{
+	return OkToChangeTag(tif, tag) ?
+	    (*tif->tif_tagmethods.vsetfield)(tif, tag, ap) : 0;
+}
+
+static int
+_TIFFVGetField(TIFF* tif, ttag_t tag, va_list ap)
+{
+    TIFFDirectory* td = &tif->tif_dir;
+    int            ret_val = 1;
+
+    switch (tag) {
+	case TIFFTAG_SUBFILETYPE:
+            *va_arg(ap, uint32*) = td->td_subfiletype;
+            break;
+	case TIFFTAG_IMAGEWIDTH:
+            *va_arg(ap, uint32*) = td->td_imagewidth;
+            break;
+	case TIFFTAG_IMAGELENGTH:
+            *va_arg(ap, uint32*) = td->td_imagelength;
+            break;
+	case TIFFTAG_BITSPERSAMPLE:
+            *va_arg(ap, uint16*) = td->td_bitspersample;
+            break;
+	case TIFFTAG_COMPRESSION:
+            *va_arg(ap, uint16*) = td->td_compression;
+            break;
+	case TIFFTAG_PHOTOMETRIC:
+            *va_arg(ap, uint16*) = td->td_photometric;
+            break;
+	case TIFFTAG_THRESHHOLDING:
+            *va_arg(ap, uint16*) = td->td_threshholding;
+            break;
+	case TIFFTAG_FILLORDER:
+            *va_arg(ap, uint16*) = td->td_fillorder;
+            break;
+	case TIFFTAG_ORIENTATION:
+            *va_arg(ap, uint16*) = td->td_orientation;
+            break;
+	case TIFFTAG_SAMPLESPERPIXEL:
+            *va_arg(ap, uint16*) = td->td_samplesperpixel;
+            break;
+	case TIFFTAG_ROWSPERSTRIP:
+            *va_arg(ap, uint32*) = td->td_rowsperstrip;
+            break;
+	case TIFFTAG_MINSAMPLEVALUE:
+            *va_arg(ap, uint16*) = td->td_minsamplevalue;
+            break;
+	case TIFFTAG_MAXSAMPLEVALUE:
+            *va_arg(ap, uint16*) = td->td_maxsamplevalue;
+            break;
+	case TIFFTAG_SMINSAMPLEVALUE:
+            *va_arg(ap, double*) = td->td_sminsamplevalue;
+            break;
+	case TIFFTAG_SMAXSAMPLEVALUE:
+            *va_arg(ap, double*) = td->td_smaxsamplevalue;
+            break;
+	case TIFFTAG_XRESOLUTION:
+            *va_arg(ap, float*) = td->td_xresolution;
+            break;
+	case TIFFTAG_YRESOLUTION:
+            *va_arg(ap, float*) = td->td_yresolution;
+            break;
+	case TIFFTAG_PLANARCONFIG:
+            *va_arg(ap, uint16*) = td->td_planarconfig;
+            break;
+	case TIFFTAG_XPOSITION:
+            *va_arg(ap, float*) = td->td_xposition;
+            break;
+	case TIFFTAG_YPOSITION:
+            *va_arg(ap, float*) = td->td_yposition;
+            break;
+	case TIFFTAG_RESOLUTIONUNIT:
+            *va_arg(ap, uint16*) = td->td_resolutionunit;
+            break;
+	case TIFFTAG_PAGENUMBER:
+            *va_arg(ap, uint16*) = td->td_pagenumber[0];
+            *va_arg(ap, uint16*) = td->td_pagenumber[1];
+            break;
+	case TIFFTAG_HALFTONEHINTS:
+            *va_arg(ap, uint16*) = td->td_halftonehints[0];
+            *va_arg(ap, uint16*) = td->td_halftonehints[1];
+            break;
+	case TIFFTAG_COLORMAP:
+            *va_arg(ap, uint16**) = td->td_colormap[0];
+            *va_arg(ap, uint16**) = td->td_colormap[1];
+            *va_arg(ap, uint16**) = td->td_colormap[2];
+            break;
+	case TIFFTAG_STRIPOFFSETS:
+	case TIFFTAG_TILEOFFSETS:
+            *va_arg(ap, uint32**) = td->td_stripoffset;
+            break;
+	case TIFFTAG_STRIPBYTECOUNTS:
+	case TIFFTAG_TILEBYTECOUNTS:
+            *va_arg(ap, uint32**) = td->td_stripbytecount;
+            break;
+	case TIFFTAG_MATTEING:
+            *va_arg(ap, uint16*) =
+                (td->td_extrasamples == 1 &&
+                 td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
+            break;
+	case TIFFTAG_EXTRASAMPLES:
+            *va_arg(ap, uint16*) = td->td_extrasamples;
+            *va_arg(ap, uint16**) = td->td_sampleinfo;
+            break;
+	case TIFFTAG_TILEWIDTH:
+            *va_arg(ap, uint32*) = td->td_tilewidth;
+            break;
+	case TIFFTAG_TILELENGTH:
+            *va_arg(ap, uint32*) = td->td_tilelength;
+            break;
+	case TIFFTAG_TILEDEPTH:
+            *va_arg(ap, uint32*) = td->td_tiledepth;
+            break;
+	case TIFFTAG_DATATYPE:
+            switch (td->td_sampleformat) {
+		case SAMPLEFORMAT_UINT:
+                    *va_arg(ap, uint16*) = DATATYPE_UINT;
+                    break;
+		case SAMPLEFORMAT_INT:
+                    *va_arg(ap, uint16*) = DATATYPE_INT;
+                    break;
+		case SAMPLEFORMAT_IEEEFP:
+                    *va_arg(ap, uint16*) = DATATYPE_IEEEFP;
+                    break;
+		case SAMPLEFORMAT_VOID:
+                    *va_arg(ap, uint16*) = DATATYPE_VOID;
+                    break;
+            }
+            break;
+	case TIFFTAG_SAMPLEFORMAT:
+            *va_arg(ap, uint16*) = td->td_sampleformat;
+            break;
+	case TIFFTAG_IMAGEDEPTH:
+            *va_arg(ap, uint32*) = td->td_imagedepth;
+            break;
+	case TIFFTAG_SUBIFD:
+            *va_arg(ap, uint16*) = td->td_nsubifd;
+            *va_arg(ap, uint32**) = td->td_subifd;
+            break;
+	case TIFFTAG_YCBCRPOSITIONING:
+            *va_arg(ap, uint16*) = td->td_ycbcrpositioning;
+            break;
+	case TIFFTAG_YCBCRSUBSAMPLING:
+            *va_arg(ap, uint16*) = td->td_ycbcrsubsampling[0];
+            *va_arg(ap, uint16*) = td->td_ycbcrsubsampling[1];
+            break;
+	case TIFFTAG_TRANSFERFUNCTION:
+            *va_arg(ap, uint16**) = td->td_transferfunction[0];
+            if (td->td_samplesperpixel - td->td_extrasamples > 1) {
+                *va_arg(ap, uint16**) = td->td_transferfunction[1];
+                *va_arg(ap, uint16**) = td->td_transferfunction[2];
+            }
+            break;
+	case TIFFTAG_REFERENCEBLACKWHITE:
+	    *va_arg(ap, float**) = td->td_refblackwhite;
+	    break;
+	case TIFFTAG_INKNAMES:
+            *va_arg(ap, char**) = td->td_inknames;
+            break;
+        default:
+        {
+            const TIFFFieldInfo* fip = _TIFFFindFieldInfo(tif, tag, TIFF_ANY);
+            int           i;
+            
+            /*
+	     * This can happen if multiple images are open with different
+	     * codecs which have private tags.  The global tag information
+	     * table may then have tags that are valid for one file but not
+	     * the other. If the client tries to get a tag that is not valid
+	     * for the image's codec then we'll arrive here.
+             */
+            if( fip == NULL || fip->field_bit != FIELD_CUSTOM )
+            {
+		    TIFFErrorExt(tif->tif_clientdata, "_TIFFVGetField",
+				 "%s: Invalid %stag \"%s\" "
+				 "(not supported by codec)",
+				 tif->tif_name,
+				 isPseudoTag(tag) ? "pseudo-" : "",
+				 fip ? fip->field_name : "Unknown");
+		    ret_val = 0;
+		    break;
+            }
+
+            /*
+	     * Do we have a custom value?
+	     */
+            ret_val = 0;
+            for (i = 0; i < td->td_customValueCount; i++) {
+		TIFFTagValue *tv = td->td_customValues + i;
+
+		if (tv->info->field_tag != tag)
+			continue;
+                
+		if (fip->field_passcount) {
+			if (fip->field_readcount == TIFF_VARIABLE2) 
+				*va_arg(ap, uint32*) = (uint32)tv->count;
+			else	/* Assume TIFF_VARIABLE */
+				*va_arg(ap, uint16*) = (uint16)tv->count;
+			*va_arg(ap, void **) = tv->value;
+			ret_val = 1;
+                } else {
+			if ((fip->field_type == TIFF_ASCII
+			    || fip->field_readcount == TIFF_VARIABLE
+			    || fip->field_readcount == TIFF_VARIABLE2
+			    || fip->field_readcount == TIFF_SPP
+			    || tv->count > 1)
+			    && fip->field_tag != TIFFTAG_PAGENUMBER
+			    && fip->field_tag != TIFFTAG_HALFTONEHINTS
+			    && fip->field_tag != TIFFTAG_YCBCRSUBSAMPLING
+			    && fip->field_tag != TIFFTAG_DOTRANGE) {
+				*va_arg(ap, void **) = tv->value;
+				ret_val = 1;
+			} else {
+			    int j;
+			    char *val = (char *)tv->value;
+
+			    for (j = 0; j < tv->count;
+				 j++, val += _TIFFDataSize(tv->info->field_type)) {
+				switch (fip->field_type) {
+					case TIFF_BYTE:
+					case TIFF_UNDEFINED:
+						*va_arg(ap, uint8*) =
+							*(uint8 *)val;
+						ret_val = 1;
+						break;
+					case TIFF_SBYTE:
+						*va_arg(ap, int8*) =
+							*(int8 *)val;
+						ret_val = 1;
+						break;
+					case TIFF_SHORT:
+						*va_arg(ap, uint16*) =
+							*(uint16 *)val;
+						ret_val = 1;
+						break;
+					case TIFF_SSHORT:
+						*va_arg(ap, int16*) =
+							*(int16 *)val;
+						ret_val = 1;
+						break;
+					case TIFF_LONG:
+					case TIFF_IFD:
+						*va_arg(ap, uint32*) =
+							*(uint32 *)val;
+						ret_val = 1;
+						break;
+					case TIFF_SLONG:
+						*va_arg(ap, int32*) =
+							*(int32 *)val;
+						ret_val = 1;
+						break;
+					case TIFF_RATIONAL:
+					case TIFF_SRATIONAL:
+					case TIFF_FLOAT:
+						*va_arg(ap, float*) =
+							*(float *)val;
+						ret_val = 1;
+						break;
+					case TIFF_DOUBLE:
+						*va_arg(ap, double*) =
+							*(double *)val;
+						ret_val = 1;
+						break;
+					default:
+						ret_val = 0;
+						break;
+				}
+			    }
+			}
+                }
+		break;
+            }
+        }
+    }
+    return(ret_val);
+}
+
+/*
+ * Return the value of a field in the
+ * internal directory structure.
+ */
+int
+TIFFGetField(TIFF* tif, ttag_t tag, ...)
+{
+	int status;
+	va_list ap;
+
+	va_start(ap, tag);
+	status = TIFFVGetField(tif, tag, ap);
+	va_end(ap);
+	return (status);
+}
+
+/*
+ * Like TIFFGetField, but taking a varargs
+ * parameter list.  This routine is useful
+ * for building higher-level interfaces on
+ * top of the library.
+ */
+int
+TIFFVGetField(TIFF* tif, ttag_t tag, va_list ap)
+{
+	const TIFFFieldInfo* fip = _TIFFFindFieldInfo(tif, tag, TIFF_ANY);
+	return (fip && (isPseudoTag(tag) || TIFFFieldSet(tif, fip->field_bit)) ?
+	    (*tif->tif_tagmethods.vgetfield)(tif, tag, ap) : 0);
+}
+
+#define	CleanupField(member) {		\
+    if (td->member) {			\
+	_TIFFfree(td->member);		\
+	td->member = 0;			\
+    }					\
+}
+
+/*
+ * Release storage associated with a directory.
+ */
+void
+TIFFFreeDirectory(TIFF* tif)
+{
+	TIFFDirectory *td = &tif->tif_dir;
+	int            i;
+
+	_TIFFmemset(td->td_fieldsset, 0, FIELD_SETLONGS);
+	CleanupField(td_colormap[0]);
+	CleanupField(td_colormap[1]);
+	CleanupField(td_colormap[2]);
+	CleanupField(td_sampleinfo);
+	CleanupField(td_subifd);
+	CleanupField(td_inknames);
+	CleanupField(td_refblackwhite);
+	CleanupField(td_transferfunction[0]);
+	CleanupField(td_transferfunction[1]);
+	CleanupField(td_transferfunction[2]);
+	CleanupField(td_stripoffset);
+	CleanupField(td_stripbytecount);
+	TIFFClrFieldBit(tif, FIELD_YCBCRSUBSAMPLING);
+	TIFFClrFieldBit(tif, FIELD_YCBCRPOSITIONING);
+
+	/* Cleanup custom tag values */
+	for( i = 0; i < td->td_customValueCount; i++ ) {
+		if (td->td_customValues[i].value)
+			_TIFFfree(td->td_customValues[i].value);
+	}
+
+	td->td_customValueCount = 0;
+	CleanupField(td_customValues);
+}
+#undef CleanupField
+
+/*
+ * Client Tag extension support (from Niles Ritter).
+ */
+static TIFFExtendProc _TIFFextender = (TIFFExtendProc) NULL;
+
+TIFFExtendProc
+TIFFSetTagExtender(TIFFExtendProc extender)
+{
+	TIFFExtendProc prev = _TIFFextender;
+	_TIFFextender = extender;
+	return (prev);
+}
+
+/*
+ * Setup for a new directory.  Should we automatically call
+ * TIFFWriteDirectory() if the current one is dirty?
+ *
+ * The newly created directory will not exist on the file till
+ * TIFFWriteDirectory(), TIFFFlush() or TIFFClose() is called.
+ */
+int
+TIFFCreateDirectory(TIFF* tif)
+{
+    TIFFDefaultDirectory(tif);
+    tif->tif_diroff = 0;
+    tif->tif_nextdiroff = 0;
+    tif->tif_curoff = 0;
+    tif->tif_row = (uint32) -1;
+    tif->tif_curstrip = (tstrip_t) -1;
+
+    return 0;
+}
+
+/*
+ * Setup a default directory structure.
+ */
+int
+TIFFDefaultDirectory(TIFF* tif)
+{
+	register TIFFDirectory* td = &tif->tif_dir;
+
+	size_t tiffFieldInfoCount;
+	const TIFFFieldInfo *tiffFieldInfo =
+	    _TIFFGetFieldInfo(&tiffFieldInfoCount);
+	_TIFFSetupFieldInfo(tif, tiffFieldInfo, tiffFieldInfoCount);
+
+	_TIFFmemset(td, 0, sizeof (*td));
+	td->td_fillorder = FILLORDER_MSB2LSB;
+	td->td_bitspersample = 1;
+	td->td_threshholding = THRESHHOLD_BILEVEL;
+	td->td_orientation = ORIENTATION_TOPLEFT;
+	td->td_samplesperpixel = 1;
+	td->td_rowsperstrip = (uint32) -1;
+	td->td_tilewidth = 0;
+	td->td_tilelength = 0;
+	td->td_tiledepth = 1;
+	td->td_stripbytecountsorted = 1; /* Our own arrays always sorted. */
+	td->td_resolutionunit = RESUNIT_INCH;
+	td->td_sampleformat = SAMPLEFORMAT_UINT;
+	td->td_imagedepth = 1;
+	td->td_ycbcrsubsampling[0] = 2;
+	td->td_ycbcrsubsampling[1] = 2;
+	td->td_ycbcrpositioning = YCBCRPOSITION_CENTERED;
+	tif->tif_postdecode = _TIFFNoPostDecode;
+	tif->tif_foundfield = NULL;
+	tif->tif_tagmethods.vsetfield = _TIFFVSetField;
+	tif->tif_tagmethods.vgetfield = _TIFFVGetField;
+	tif->tif_tagmethods.printdir = NULL;
+	/*
+	 *  Give client code a chance to install their own
+	 *  tag extensions & methods, prior to compression overloads.
+	 */
+	if (_TIFFextender)
+		(*_TIFFextender)(tif);
+	(void) TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
+	/*
+	 * NB: The directory is marked dirty as a result of setting
+	 * up the default compression scheme.  However, this really
+	 * isn't correct -- we want TIFF_DIRTYDIRECT to be set only
+	 * if the user does something.  We could just do the setup
+	 * by hand, but it seems better to use the normal mechanism
+	 * (i.e. TIFFSetField).
+	 */
+	tif->tif_flags &= ~TIFF_DIRTYDIRECT;
+
+	/*
+	 * As per http://bugzilla.remotesensing.org/show_bug.cgi?id=19
+	 * we clear the ISTILED flag when setting up a new directory.
+	 * Should we also be clearing stuff like INSUBIFD?
+	 */
+	tif->tif_flags &= ~TIFF_ISTILED;
+        /*
+         * Clear other directory-specific fields.
+         */
+        tif->tif_tilesize = -1;
+        tif->tif_scanlinesize = -1;
+
+	return (1);
+}
+
+static int
+TIFFAdvanceDirectory(TIFF* tif, uint32* nextdir, toff_t* off)
+{
+	static const char module[] = "TIFFAdvanceDirectory";
+	uint16 dircount;
+	if (isMapped(tif))
+	{
+		toff_t poff=*nextdir;
+		if (poff+sizeof(uint16) > tif->tif_size)
+		{
+			TIFFErrorExt(tif->tif_clientdata, module, "%s: Error fetching directory count",
+			    tif->tif_name);
+			return (0);
+		}
+		_TIFFmemcpy(&dircount, tif->tif_base+poff, sizeof (uint16));
+		if (tif->tif_flags & TIFF_SWAB)
+			TIFFSwabShort(&dircount);
+		poff+=sizeof (uint16)+dircount*sizeof (TIFFDirEntry);
+		if (off != NULL)
+			*off = poff;
+		if (((toff_t) (poff+sizeof (uint32))) > tif->tif_size)
+		{
+			TIFFErrorExt(tif->tif_clientdata, module, "%s: Error fetching directory link",
+			    tif->tif_name);
+			return (0);
+		}
+		_TIFFmemcpy(nextdir, tif->tif_base+poff, sizeof (uint32));
+		if (tif->tif_flags & TIFF_SWAB)
+			TIFFSwabLong(nextdir);
+		return (1);
+	}
+	else
+	{
+		if (!SeekOK(tif, *nextdir) ||
+		    !ReadOK(tif, &dircount, sizeof (uint16))) {
+			TIFFErrorExt(tif->tif_clientdata, module, "%s: Error fetching directory count",
+			    tif->tif_name);
+			return (0);
+		}
+		if (tif->tif_flags & TIFF_SWAB)
+			TIFFSwabShort(&dircount);
+		if (off != NULL)
+			*off = TIFFSeekFile(tif,
+			    dircount*sizeof (TIFFDirEntry), SEEK_CUR);
+		else
+			(void) TIFFSeekFile(tif,
+			    dircount*sizeof (TIFFDirEntry), SEEK_CUR);
+		if (!ReadOK(tif, nextdir, sizeof (uint32))) {
+			TIFFErrorExt(tif->tif_clientdata, module, "%s: Error fetching directory link",
+			    tif->tif_name);
+			return (0);
+		}
+		if (tif->tif_flags & TIFF_SWAB)
+			TIFFSwabLong(nextdir);
+		return (1);
+	}
+}
+
+/*
+ * Count the number of directories in a file.
+ */
+tdir_t
+TIFFNumberOfDirectories(TIFF* tif)
+{
+    toff_t nextdir = tif->tif_header.tiff_diroff;
+    tdir_t n = 0;
+    
+    while (nextdir != 0 && TIFFAdvanceDirectory(tif, &nextdir, NULL))
+        n++;
+    return (n);
+}
+
+/*
+ * Set the n-th directory as the current directory.
+ * NB: Directories are numbered starting at 0.
+ */
+int
+TIFFSetDirectory(TIFF* tif, tdir_t dirn)
+{
+	toff_t nextdir;
+	tdir_t n;
+
+	nextdir = tif->tif_header.tiff_diroff;
+	for (n = dirn; n > 0 && nextdir != 0; n--)
+		if (!TIFFAdvanceDirectory(tif, &nextdir, NULL))
+			return (0);
+	tif->tif_nextdiroff = nextdir;
+	/*
+	 * Set curdir to the actual directory index.  The
+	 * -1 is because TIFFReadDirectory will increment
+	 * tif_curdir after successfully reading the directory.
+	 */
+	tif->tif_curdir = (dirn - n) - 1;
+	/*
+	 * Reset tif_dirnumber counter and start new list of seen directories.
+	 * We need this to prevent IFD loops.
+	 */
+	tif->tif_dirnumber = 0;
+	return (TIFFReadDirectory(tif));
+}
+
+/*
+ * Set the current directory to be the directory
+ * located at the specified file offset.  This interface
+ * is used mainly to access directories linked with
+ * the SubIFD tag (e.g. thumbnail images).
+ */
+int
+TIFFSetSubDirectory(TIFF* tif, uint32 diroff)
+{
+	tif->tif_nextdiroff = diroff;
+	/*
+	 * Reset tif_dirnumber counter and start new list of seen directories.
+	 * We need this to prevent IFD loops.
+	 */
+	tif->tif_dirnumber = 0;
+	return (TIFFReadDirectory(tif));
+}
+
+/*
+ * Return file offset of the current directory.
+ */
+uint32
+TIFFCurrentDirOffset(TIFF* tif)
+{
+	return (tif->tif_diroff);
+}
+
+/*
+ * Return an indication of whether or not we are
+ * at the last directory in the file.
+ */
+int
+TIFFLastDirectory(TIFF* tif)
+{
+	return (tif->tif_nextdiroff == 0);
+}
+
+/*
+ * Unlink the specified directory from the directory chain.
+ */
+int
+TIFFUnlinkDirectory(TIFF* tif, tdir_t dirn)
+{
+	static const char module[] = "TIFFUnlinkDirectory";
+	toff_t nextdir;
+	toff_t off;
+	tdir_t n;
+
+	if (tif->tif_mode == O_RDONLY) {
+		TIFFErrorExt(tif->tif_clientdata, module,
+                             "Can not unlink directory in read-only file");
+		return (0);
+	}
+	/*
+	 * Go to the directory before the one we want
+	 * to unlink and nab the offset of the link
+	 * field we'll need to patch.
+	 */
+	nextdir = tif->tif_header.tiff_diroff;
+	off = sizeof (uint16) + sizeof (uint16);
+	for (n = dirn-1; n > 0; n--) {
+		if (nextdir == 0) {
+			TIFFErrorExt(tif->tif_clientdata, module, "Directory %d does not exist", dirn);
+			return (0);
+		}
+		if (!TIFFAdvanceDirectory(tif, &nextdir, &off))
+			return (0);
+	}
+	/*
+	 * Advance to the directory to be unlinked and fetch
+	 * the offset of the directory that follows.
+	 */
+	if (!TIFFAdvanceDirectory(tif, &nextdir, NULL))
+		return (0);
+	/*
+	 * Go back and patch the link field of the preceding
+	 * directory to point to the offset of the directory
+	 * that follows.
+	 */
+	(void) TIFFSeekFile(tif, off, SEEK_SET);
+	if (tif->tif_flags & TIFF_SWAB)
+		TIFFSwabLong(&nextdir);
+	if (!WriteOK(tif, &nextdir, sizeof (uint32))) {
+		TIFFErrorExt(tif->tif_clientdata, module, "Error writing directory link");
+		return (0);
+	}
+	/*
+	 * Leave directory state setup safely.  We don't have
+	 * facilities for doing inserting and removing directories,
+	 * so it's safest to just invalidate everything.  This
+	 * means that the caller can only append to the directory
+	 * chain.
+	 */
+	(*tif->tif_cleanup)(tif);
+	if ((tif->tif_flags & TIFF_MYBUFFER) && tif->tif_rawdata) {
+		_TIFFfree(tif->tif_rawdata);
+		tif->tif_rawdata = NULL;
+		tif->tif_rawcc = 0;
+	}
+	tif->tif_flags &= ~(TIFF_BEENWRITING|TIFF_BUFFERSETUP|TIFF_POSTENCODE);
+	TIFFFreeDirectory(tif);
+	TIFFDefaultDirectory(tif);
+	tif->tif_diroff = 0;			/* force link on next write */
+	tif->tif_nextdiroff = 0;		/* next write must be at end */
+	tif->tif_curoff = 0;
+	tif->tif_row = (uint32) -1;
+	tif->tif_curstrip = (tstrip_t) -1;
+	return (1);
+}
+
+/*			[BFC]
+ *
+ * Author: Bruce Cameron <cameron@petris.com>
+ *
+ * Set a table of tags that are to be replaced during directory process by the
+ * 'IGNORE' state - or return TRUE/FALSE for the requested tag such that
+ * 'ReadDirectory' can use the stored information.
+ *
+ * FIXME: this is never used properly. Should be removed in the future.
+ */
+int
+TIFFReassignTagToIgnore (enum TIFFIgnoreSense task, int TIFFtagID)
+{
+    static int TIFFignoretags [FIELD_LAST];
+    static int tagcount = 0 ;
+    int		i;					/* Loop index */
+    int		j;					/* Loop index */
+
+    switch (task)
+    {
+      case TIS_STORE:
+        if ( tagcount < (FIELD_LAST - 1) )
+        {
+            for ( j = 0 ; j < tagcount ; ++j )
+            {					/* Do not add duplicate tag */
+                if ( TIFFignoretags [j] == TIFFtagID )
+                    return (TRUE) ;
+            }
+            TIFFignoretags [tagcount++] = TIFFtagID ;
+            return (TRUE) ;
+        }
+        break ;
+        
+      case TIS_EXTRACT:
+        for ( i = 0 ; i < tagcount ; ++i )
+        {
+            if ( TIFFignoretags [i] == TIFFtagID )
+                return (TRUE) ;
+        }
+        break;
+        
+      case TIS_EMPTY:
+        tagcount = 0 ;			/* Clear the list */
+        return (TRUE) ;
+        
+      default:
+        break;
+    }
+    
+    return (FALSE);
+}
+
+/* vim: set ts=8 sts=8 sw=8 noet: */
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 8
+ * fill-column: 78
+ * End:
+ */