Initial import of argyll version 1.5.1-8debian/1.5.1-8

1 files changed, 1131 insertions, 0 deletions

diff --git a/tiff/contrib/pds/tif_pdsdirread.c b/tiff/contrib/pds/tif_pdsdirread.c
new file mode 100644
index 0000000..3d01311
--- /dev/null
+++ b/tiff/contrib/pds/tif_pdsdirread.c
@@ -0,0 +1,1131 @@
+/* $Header: /cvs/maptools/cvsroot/libtiff/contrib/pds/tif_pdsdirread.c,v 1.3.2.1 2010-06-08 18:50:41 bfriesen Exp $ */
+
+/*
+ * Copyright (c) 1988-1996 Sam Leffler
+ * Copyright (c) 1991-1996 Silicon Graphics, Inc.
+ * Copyright (c( 1996 USAF Phillips Laboratory
+ *
+ * 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.
+ * 
+ * These routines written by Conrad J. Poelman on a single late-night of
+ * March 20-21, 1996.
+ *
+ * The entire purpose of this file is to provide a single external function,
+ * TIFFReadPrivateDataSubDirectory(). This function is intended for use in reading a
+ * private subdirectory from a TIFF file into a private structure. The
+ * actual writing of data into the structure is handled by the setFieldFn(),
+ * which is passed to TIFFReadPrivateDataSubDirectory() as a parameter. The idea is to
+ * enable any application wishing to store private subdirectories to do so
+ * easily using this function, without modifying the TIFF library.
+ *
+ * The astute observer will notice that only two functions are at all different
+ * from the original tif_dirread.c file: TIFFReadPrivateDataSubDirectory() and
+ * TIFFFetchNormalSubTag(). All the other stuff that makes this file so huge
+ * is only necessary because all of those functions are declared static in
+ * tif_dirread.c, so we have to totally duplicate them in order to use them.
+ *
+ * Oh, also note the bug fix in TIFFFetchFloat().
+ *
+ */
+
+#include "tiffiop.h"
+
+#define	IGNORE	0		/* tag placeholder used below */
+
+#if HAVE_IEEEFP
+#define	TIFFCvtIEEEFloatToNative(tif, n, fp)
+#define	TIFFCvtIEEEDoubleToNative(tif, n, dp)
+#else
+extern	void TIFFCvtIEEEFloatToNative(TIFF*, uint32, float*);
+extern	void TIFFCvtIEEEDoubleToNative(TIFF*, uint32, double*);
+#endif
+
+static	void EstimateStripByteCounts(TIFF*, TIFFDirEntry*, uint16);
+static	void MissingRequired(TIFF*, const char*);
+static	int CheckDirCount(TIFF*, TIFFDirEntry*, uint32);
+static	tsize_t TIFFFetchData(TIFF*, TIFFDirEntry*, char*);
+static	tsize_t TIFFFetchString(TIFF*, TIFFDirEntry*, char*);
+static	float TIFFFetchRational(TIFF*, TIFFDirEntry*);
+static	int TIFFFetchNormalSubTag(TIFF*, TIFFDirEntry*, const TIFFFieldInfo*,
+				  int (*getFieldFn)(TIFF *tif,ttag_t tag,...));
+static	int TIFFFetchPerSampleShorts(TIFF*, TIFFDirEntry*, int*);
+static	int TIFFFetchPerSampleAnys(TIFF*, TIFFDirEntry*, double*);
+static	int TIFFFetchShortArray(TIFF*, TIFFDirEntry*, uint16*);
+static	int TIFFFetchStripThing(TIFF*, TIFFDirEntry*, long, uint32**);
+static	int TIFFFetchExtraSamples(TIFF*, TIFFDirEntry*);
+static	int TIFFFetchRefBlackWhite(TIFF*, TIFFDirEntry*);
+static	float TIFFFetchFloat(TIFF*, TIFFDirEntry*);
+static	int TIFFFetchFloatArray(TIFF*, TIFFDirEntry*, float*);
+static	int TIFFFetchDoubleArray(TIFF*, TIFFDirEntry*, double*);
+static	int TIFFFetchAnyArray(TIFF*, TIFFDirEntry*, double*);
+static	int TIFFFetchShortPair(TIFF*, TIFFDirEntry*);
+#if STRIPCHOP_SUPPORT
+static	void ChopUpSingleUncompressedStrip(TIFF*);
+#endif
+
+static char *
+CheckMalloc(TIFF* tif, tsize_t n, const char* what)
+{
+	char *cp = (char*)_TIFFmalloc(n);
+	if (cp == NULL)
+		TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "No space %s", what);
+	return (cp);
+}
+
+/* Just as was done with TIFFWritePrivateDataSubDirectory(), here we implement
+   TIFFReadPrivateDataSubDirectory() which takes an offset into the TIFF file,
+   a TIFFFieldInfo structure specifying the types of the various tags,
+   and a function to use to set individual tags when they are encountered.
+   The data is read from the file, translated using the TIFF library's
+   built-in machine-independent conversion functions, and filled into
+   private subdirectory structure.
+
+   This code was written by copying the original TIFFReadDirectory() function
+   from tif_dirread.c and paring it down to what is needed for this.
+
+   It is the caller's responsibility to allocate and initialize the internal
+   structure that setFieldFn() will be writing into. If this function is being
+   called more than once before closing the file, the caller also must be
+   careful to free data in the structure before re-initializing.
+
+   It is also the caller's responsibility to verify the presence of
+   any required fields after reading the directory in.
+*/
+
+
+int
+TIFFReadPrivateDataSubDirectory(TIFF* tif, toff_t pdir_offset,
+				TIFFFieldInfo *field_info,
+				int (*setFieldFn)(TIFF *tif, ttag_t tag, ...))
+{
+	register TIFFDirEntry* dp;
+	register int n;
+	register TIFFDirectory* td;
+	TIFFDirEntry* dir;
+	int iv;
+	long v;
+	double dv;
+	const TIFFFieldInfo* fip;
+	int fix;
+	uint16 dircount;
+	uint32 nextdiroff;
+	char* cp;
+	int diroutoforderwarning = 0;
+
+	/* Skipped part about checking for directories or compression data. */
+
+	if (!isMapped(tif)) {
+		if (!SeekOK(tif, pdir_offset)) {
+			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+			    "Seek error accessing TIFF private subdirectory");
+			return (0);
+		}
+		if (!ReadOK(tif, &dircount, sizeof (uint16))) {
+			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+			    "Can not read TIFF private subdirectory count");
+			return (0);
+		}
+		if (tif->tif_flags & TIFF_SWAB)
+			TIFFSwabShort(&dircount);
+		dir = (TIFFDirEntry *)CheckMalloc(tif,
+		    dircount * sizeof (TIFFDirEntry), "to read TIFF private subdirectory");
+		if (dir == NULL)
+			return (0);
+		if (!ReadOK(tif, dir, dircount*sizeof (TIFFDirEntry))) {
+			TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Can not read TIFF private subdirectory");
+			goto bad;
+		}
+		/*
+		 * Read offset to next directory for sequential scans.
+		 */
+		(void) ReadOK(tif, &nextdiroff, sizeof (uint32));
+	} else {
+		toff_t off = pdir_offset;
+
+		if (off + sizeof (short) > tif->tif_size) {
+			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+			    "Can not read TIFF private subdirectory count");
+			return (0);
+		} else
+			_TIFFmemcpy(&dircount, tif->tif_base + off, sizeof (uint16));
+		off += sizeof (uint16);
+		if (tif->tif_flags & TIFF_SWAB)
+			TIFFSwabShort(&dircount);
+		dir = (TIFFDirEntry *)CheckMalloc(tif,
+		    dircount * sizeof (TIFFDirEntry), "to read TIFF private subdirectory");
+		if (dir == NULL)
+			return (0);
+		if (off + dircount*sizeof (TIFFDirEntry) > tif->tif_size) {
+			TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Can not read TIFF private subdirectory");
+			goto bad;
+		} else
+			_TIFFmemcpy(dir, tif->tif_base + off,
+			    dircount*sizeof (TIFFDirEntry));
+		off += dircount* sizeof (TIFFDirEntry);
+		if (off + sizeof (uint32) < tif->tif_size)
+			_TIFFmemcpy(&nextdiroff, tif->tif_base+off, sizeof (uint32));
+	}
+	if (tif->tif_flags & TIFF_SWAB)
+		TIFFSwabLong(&nextdiroff);
+
+	/*
+	 * 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.
+	 */
+	td = &tif->tif_dir;
+	
+	for (fip = field_info, dp = dir, n = dircount;
+	     n > 0; n--, dp++) {
+		if (tif->tif_flags & TIFF_SWAB) {
+			TIFFSwabArrayOfShort(&dp->tdir_tag, 2);
+			TIFFSwabArrayOfLong(&dp->tdir_count, 2);
+		}
+		/*
+		 * Find the field information entry for this tag.
+		 */
+		/*
+		 * Silicon Beach (at least) writes unordered
+		 * directory tags (violating the spec).  Handle
+		 * it here, but be obnoxious (maybe they'll fix it?).
+		 */
+		if (dp->tdir_tag < fip->field_tag) {
+			if (!diroutoforderwarning) {
+				TIFFWarning(tif->tif_name,
+	"invalid TIFF private subdirectory; tags are not sorted in ascending order");
+				diroutoforderwarning = 1;
+			}
+			fip = field_info;    /* O(n^2) */
+		}
+
+		while (fip->field_tag && fip->field_tag < dp->tdir_tag)
+			fip++;
+		if (!fip->field_tag || fip->field_tag != dp->tdir_tag) {
+			TIFFWarning(tif->tif_name,
+			    "unknown field with tag %d (0x%x) in private subdirectory ignored",
+			    dp->tdir_tag,  dp->tdir_tag);
+			dp->tdir_tag = IGNORE;
+			fip = field_info;/* restart search */
+			continue;
+		}
+		/*
+		 * Null out old tags that we ignore.
+		 */
+
+		/* Not implemented yet, since FIELD_IGNORE is specific to
+		   the main directories. Could pass this in too... */
+		if (0 /* && fip->field_bit == FIELD_IGNORE */) {
+	ignore:
+			dp->tdir_tag = IGNORE;
+			continue;
+		}
+
+		/*
+		 * Check data type.
+		 */
+
+		while (dp->tdir_type != (u_short)fip->field_type) {
+			if (fip->field_type == TIFF_ANY)	/* wildcard */
+				break;
+			fip++;
+			if (!fip->field_tag || fip->field_tag != dp->tdir_tag) {
+				TIFFWarning(tif->tif_name,
+				   "wrong data type %d for \"%s\"; tag ignored",
+				    dp->tdir_type, fip[-1].field_name);
+				goto ignore;
+			}
+		}
+		/*
+		 * Check count if known in advance.
+		 */
+		if (fip->field_readcount != TIFF_VARIABLE) {
+			uint32 expected = (fip->field_readcount == TIFF_SPP) ?
+			    (uint32) td->td_samplesperpixel :
+			    (uint32) fip->field_readcount;
+			if (!CheckDirCount(tif, dp, expected))
+				goto ignore;
+		}
+
+		/* Now read in and process data from field. */
+		if (!TIFFFetchNormalSubTag(tif, dp, fip, setFieldFn))
+		    goto bad;
+
+	}
+
+	if (dir)
+		_TIFFfree(dir);
+	return (1);
+bad:
+	if (dir)
+		_TIFFfree(dir);
+	return (0);
+}
+
+static void
+EstimateStripByteCounts(TIFF* tif, TIFFDirEntry* dir, uint16 dircount)
+{
+	register TIFFDirEntry *dp;
+	register TIFFDirectory *td = &tif->tif_dir;
+	uint16 i;
+
+	if (td->td_stripbytecount)
+		_TIFFfree(td->td_stripbytecount);
+	td->td_stripbytecount = (uint32*)
+	    CheckMalloc(tif, td->td_nstrips * sizeof (uint32),
+		"for \"StripByteCounts\" array");
+	if (td->td_compression != COMPRESSION_NONE) {
+		uint32 space = (uint32)(sizeof (TIFFHeader)
+		    + sizeof (uint16)
+		    + (dircount * sizeof (TIFFDirEntry))
+		    + sizeof (uint32));
+		toff_t filesize = TIFFGetFileSize(tif);
+		uint16 n;
+
+		/* calculate amount of space used by indirect values */
+		for (dp = dir, n = dircount; n > 0; n--, dp++) {
+			uint32 cc = dp->tdir_count*TIFFDataWidth(dp->tdir_type);
+			if (cc > sizeof (uint32))
+				space += cc;
+		}
+		space = (filesize - space) / td->td_samplesperpixel;
+		for (i = 0; i < td->td_nstrips; i++)
+			td->td_stripbytecount[i] = space;
+		/*
+		 * This gross hack handles the case were the offset to
+		 * the last strip is past the place where we think the strip
+		 * should begin.  Since a strip of data must be contiguous,
+		 * it's safe to assume that we've overestimated the amount
+		 * of data in the strip and trim this number back accordingly.
+		 */ 
+		i--;
+		if (td->td_stripoffset[i] + td->td_stripbytecount[i] > filesize)
+			td->td_stripbytecount[i] =
+			    filesize - td->td_stripoffset[i];
+	} else {
+		uint32 rowbytes = TIFFScanlineSize(tif);
+		uint32 rowsperstrip = td->td_imagelength / td->td_nstrips;
+		for (i = 0; i < td->td_nstrips; i++)
+			td->td_stripbytecount[i] = rowbytes*rowsperstrip;
+	}
+	TIFFSetFieldBit(tif, FIELD_STRIPBYTECOUNTS);
+	if (!TIFFFieldSet(tif, FIELD_ROWSPERSTRIP))
+		td->td_rowsperstrip = td->td_imagelength;
+}
+
+static void
+MissingRequired(TIFF* tif, const char* tagname)
+{
+	TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+	    "TIFF directory is missing required \"%s\" field", tagname);
+}
+
+/*
+ * Check the count field of a directory
+ * entry against a known value.  The caller
+ * is expected to skip/ignore the tag if
+ * there is a mismatch.
+ */
+static int
+CheckDirCount(TIFF* tif, TIFFDirEntry* dir, uint32 count)
+{
+	if (count != dir->tdir_count) {
+		TIFFWarning(tif->tif_name,
+	"incorrect count for field \"%s\" (%lu, expecting %lu); tag ignored",
+		    _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name,
+		    dir->tdir_count, count);
+		return (0);
+	}
+	return (1);
+}
+
+/*
+ * Fetch a contiguous directory item.
+ */
+static tsize_t
+TIFFFetchData(TIFF* tif, TIFFDirEntry* dir, char* cp)
+{
+	int w = TIFFDataWidth(dir->tdir_type);
+	tsize_t cc = dir->tdir_count * w;
+
+	if (!isMapped(tif)) {
+		if (!SeekOK(tif, dir->tdir_offset))
+			goto bad;
+		if (!ReadOK(tif, cp, cc))
+			goto bad;
+	} else {
+		if (dir->tdir_offset + cc > tif->tif_size)
+			goto bad;
+		_TIFFmemcpy(cp, tif->tif_base + dir->tdir_offset, cc);
+	}
+	if (tif->tif_flags & TIFF_SWAB) {
+		switch (dir->tdir_type) {
+		case TIFF_SHORT:
+		case TIFF_SSHORT:
+			TIFFSwabArrayOfShort((uint16*) cp, dir->tdir_count);
+			break;
+		case TIFF_LONG:
+		case TIFF_SLONG:
+		case TIFF_FLOAT:
+			TIFFSwabArrayOfLong((uint32*) cp, dir->tdir_count);
+			break;
+		case TIFF_RATIONAL:
+		case TIFF_SRATIONAL:
+			TIFFSwabArrayOfLong((uint32*) cp, 2*dir->tdir_count);
+			break;
+		case TIFF_DOUBLE:
+			TIFFSwabArrayOfDouble((double*) cp, dir->tdir_count);
+			break;
+		}
+	}
+	return (cc);
+bad:
+	TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "Error fetching data for field \"%s\"",
+	    _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
+	return ((tsize_t) 0);
+}
+
+/*
+ * Fetch an ASCII item from the file.
+ */
+static tsize_t
+TIFFFetchString(TIFF* tif, TIFFDirEntry* dir, char* cp)
+{
+	if (dir->tdir_count <= 4) {
+		uint32 l = dir->tdir_offset;
+		if (tif->tif_flags & TIFF_SWAB)
+			TIFFSwabLong(&l);
+		_TIFFmemcpy(cp, &l, dir->tdir_count);
+		return (1);
+	}
+	return (TIFFFetchData(tif, dir, cp));
+}
+
+/*
+ * Convert numerator+denominator to float.
+ */
+static int
+cvtRational(TIFF* tif, TIFFDirEntry* dir, uint32 num, uint32 denom, float* rv)
+{
+	if (denom == 0) {
+		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+		    "%s: Rational with zero denominator (num = %lu)",
+		    _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name, num);
+		return (0);
+	} else {
+		if (dir->tdir_type == TIFF_RATIONAL)
+			*rv = ((float)num / (float)denom);
+		else
+			*rv = ((float)(int32)num / (float)(int32)denom);
+		return (1);
+	}
+}
+
+/*
+ * Fetch a rational item from the file
+ * at offset off and return the value
+ * as a floating point number.
+ */
+static float
+TIFFFetchRational(TIFF* tif, TIFFDirEntry* dir)
+{
+	uint32 l[2];
+	float v;
+
+	return (!TIFFFetchData(tif, dir, (char *)l) ||
+	    !cvtRational(tif, dir, l[0], l[1], &v) ? 1.0f : v);
+}
+
+/*
+ * Fetch a single floating point value
+ * from the offset field and return it
+ * as a native float.
+ */
+static float
+TIFFFetchFloat(TIFF* tif, TIFFDirEntry* dir)
+{
+	/* This appears to be a flagrant bug in the TIFF library, yet I
+	   actually don't understand how it could have ever worked the old
+	   way. Look at the comments in my new code and you'll understand. */
+#if (0)
+	float v = (float)
+	    TIFFExtractData(tif, dir->tdir_type, dir->tdir_offset);
+	TIFFCvtIEEEFloatToNative(tif, 1, &v);
+#else
+	float v;
+	/* This is a little bit tricky - if we just cast the uint32 to a float,
+	   C will perform a numerical conversion, which is not what we want.
+	   We want to take the actual bit pattern in the uint32 and interpret
+	   it as a float. Thus we cast a uint32 * into a float * and then
+	   dereference to get v. */
+	uint32 l = (uint32)
+	    TIFFExtractData(tif, dir->tdir_type, dir->tdir_offset);
+	v = * (float *) &l;
+	TIFFCvtIEEEFloatToNative(tif, 1, &v);
+#endif
+	return (v);
+
+}
+
+/*
+ * Fetch an array of BYTE or SBYTE values.
+ */
+static int
+TIFFFetchByteArray(TIFF* tif, TIFFDirEntry* dir, uint16* v)
+{
+	if (dir->tdir_count <= 4) {
+		/*
+		 * Extract data from offset field.
+		 */
+		if (tif->tif_header.tiff_magic == TIFF_BIGENDIAN) {
+			switch (dir->tdir_count) {
+			case 4: v[3] = dir->tdir_offset & 0xff;
+			case 3: v[2] = (dir->tdir_offset >> 8) & 0xff;
+			case 2: v[1] = (dir->tdir_offset >> 16) & 0xff;
+			case 1: v[0] = dir->tdir_offset >> 24;
+			}
+		} else {
+			switch (dir->tdir_count) {
+			case 4: v[3] = dir->tdir_offset >> 24;
+			case 3: v[2] = (dir->tdir_offset >> 16) & 0xff;
+			case 2: v[1] = (dir->tdir_offset >> 8) & 0xff;
+			case 1: v[0] = dir->tdir_offset & 0xff;
+			}
+		}
+		return (1);
+	} else
+		return (TIFFFetchData(tif, dir, (char*) v) != 0);	/* XXX */
+}
+
+/*
+ * Fetch an array of SHORT or SSHORT values.
+ */
+static int
+TIFFFetchShortArray(TIFF* tif, TIFFDirEntry* dir, uint16* v)
+{
+	if (dir->tdir_count <= 2) {
+		if (tif->tif_header.tiff_magic == TIFF_BIGENDIAN) {
+			switch (dir->tdir_count) {
+			case 2: v[1] = dir->tdir_offset & 0xffff;
+			case 1: v[0] = dir->tdir_offset >> 16;
+			}
+		} else {
+			switch (dir->tdir_count) {
+			case 2: v[1] = dir->tdir_offset >> 16;
+			case 1: v[0] = dir->tdir_offset & 0xffff;
+			}
+		}
+		return (1);
+	} else
+		return (TIFFFetchData(tif, dir, (char *)v) != 0);
+}
+
+/*
+ * Fetch a pair of SHORT or BYTE values.
+ */
+static int
+TIFFFetchShortPair(TIFF* tif, TIFFDirEntry* dir)
+{
+	uint16 v[2];
+	int ok = 0;
+
+	switch (dir->tdir_type) {
+	case TIFF_SHORT:
+	case TIFF_SSHORT:
+		ok = TIFFFetchShortArray(tif, dir, v);
+		break;
+	case TIFF_BYTE:
+	case TIFF_SBYTE:
+		ok  = TIFFFetchByteArray(tif, dir, v);
+		break;
+	}
+	if (ok)
+		TIFFSetField(tif, dir->tdir_tag, v[0], v[1]);
+	return (ok);
+}
+
+/*
+ * Fetch an array of LONG or SLONG values.
+ */
+static int
+TIFFFetchLongArray(TIFF* tif, TIFFDirEntry* dir, uint32* v)
+{
+	if (dir->tdir_count == 1) {
+		v[0] = dir->tdir_offset;
+		return (1);
+	} else
+		return (TIFFFetchData(tif, dir, (char*) v) != 0);
+}
+
+/*
+ * Fetch an array of RATIONAL or SRATIONAL values.
+ */
+static int
+TIFFFetchRationalArray(TIFF* tif, TIFFDirEntry* dir, float* v)
+{
+	int ok = 0;
+	uint32* l;
+
+	l = (uint32*)CheckMalloc(tif,
+	    dir->tdir_count*TIFFDataWidth(dir->tdir_type),
+	    "to fetch array of rationals");
+	if (l) {
+		if (TIFFFetchData(tif, dir, (char *)l)) {
+			uint32 i;
+			for (i = 0; i < dir->tdir_count; i++) {
+				ok = cvtRational(tif, dir,
+				    l[2*i+0], l[2*i+1], &v[i]);
+				if (!ok)
+					break;
+			}
+		}
+		_TIFFfree((char *)l);
+	}
+	return (ok);
+}
+
+/*
+ * Fetch an array of FLOAT values.
+ */
+static int
+TIFFFetchFloatArray(TIFF* tif, TIFFDirEntry* dir, float* v)
+{
+
+	if (dir->tdir_count == 1) {
+		v[0] = *(float*) &dir->tdir_offset;
+		TIFFCvtIEEEFloatToNative(tif, dir->tdir_count, v);
+		return (1);
+	} else	if (TIFFFetchData(tif, dir, (char*) v)) {
+		TIFFCvtIEEEFloatToNative(tif, dir->tdir_count, v);
+		return (1);
+	} else
+		return (0);
+}
+
+/*
+ * Fetch an array of DOUBLE values.
+ */
+static int
+TIFFFetchDoubleArray(TIFF* tif, TIFFDirEntry* dir, double* v)
+{
+	if (TIFFFetchData(tif, dir, (char*) v)) {
+		TIFFCvtIEEEDoubleToNative(tif, dir->tdir_count, v);
+		return (1);
+	} else
+		return (0);
+}
+
+/*
+ * Fetch an array of ANY values.  The actual values are
+ * returned as doubles which should be able hold all the
+ * types.  Yes, there really should be an tany_t to avoid
+ * this potential non-portability ...  Note in particular
+ * that we assume that the double return value vector is
+ * large enough to read in any fundamental type.  We use
+ * that vector as a buffer to read in the base type vector
+ * and then convert it in place to double (from end
+ * to front of course).
+ */
+static int
+TIFFFetchAnyArray(TIFF* tif, TIFFDirEntry* dir, double* v)
+{
+	int i;
+
+	switch (dir->tdir_type) {
+	case TIFF_BYTE:
+	case TIFF_SBYTE:
+		if (!TIFFFetchByteArray(tif, dir, (uint16*) v))
+			return (0);
+		if (dir->tdir_type == TIFF_BYTE) {
+			uint16* vp = (uint16*) v;
+			for (i = dir->tdir_count-1; i >= 0; i--)
+				v[i] = vp[i];
+		} else {
+			int16* vp = (int16*) v;
+			for (i = dir->tdir_count-1; i >= 0; i--)
+				v[i] = vp[i];
+		}
+		break;
+	case TIFF_SHORT:
+	case TIFF_SSHORT:
+		if (!TIFFFetchShortArray(tif, dir, (uint16*) v))
+			return (0);
+		if (dir->tdir_type == TIFF_SHORT) {
+			uint16* vp = (uint16*) v;
+			for (i = dir->tdir_count-1; i >= 0; i--)
+				v[i] = vp[i];
+		} else {
+			int16* vp = (int16*) v;
+			for (i = dir->tdir_count-1; i >= 0; i--)
+				v[i] = vp[i];
+		}
+		break;
+	case TIFF_LONG:
+	case TIFF_SLONG:
+		if (!TIFFFetchLongArray(tif, dir, (uint32*) v))
+			return (0);
+		if (dir->tdir_type == TIFF_LONG) {
+			uint32* vp = (uint32*) v;
+			for (i = dir->tdir_count-1; i >= 0; i--)
+				v[i] = vp[i];
+		} else {
+			int32* vp = (int32*) v;
+			for (i = dir->tdir_count-1; i >= 0; i--)
+				v[i] = vp[i];
+		}
+		break;
+	case TIFF_RATIONAL:
+	case TIFF_SRATIONAL:
+		if (!TIFFFetchRationalArray(tif, dir, (float*) v))
+			return (0);
+		{ float* vp = (float*) v;
+		  for (i = dir->tdir_count-1; i >= 0; i--)
+			v[i] = vp[i];
+		}
+		break;
+	case TIFF_FLOAT:
+		if (!TIFFFetchFloatArray(tif, dir, (float*) v))
+			return (0);
+		{ float* vp = (float*) v;
+		  for (i = dir->tdir_count-1; i >= 0; i--)
+			v[i] = vp[i];
+		}
+		break;
+	case TIFF_DOUBLE:
+		return (TIFFFetchDoubleArray(tif, dir, (double*) v));
+	default:
+		/* TIFF_NOTYPE */
+		/* TIFF_ASCII */
+		/* TIFF_UNDEFINED */
+		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+		    "Cannot read TIFF_ANY type %d for field \"%s\"",
+		    _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
+		return (0);
+	}
+	return (1);
+}
+
+
+/*
+ * Fetch a tag that is not handled by special case code.
+ */
+/* The standard function TIFFFetchNormalTag() could definitely be replaced
+   with a simple call to this function, just adding TIFFSetField() as the
+   last argument. */
+static int
+TIFFFetchNormalSubTag(TIFF* tif, TIFFDirEntry* dp, const TIFFFieldInfo* fip,
+		      int (*setFieldFn)(TIFF *tif, ttag_t tag, ...))
+{
+	static char mesg[] = "to fetch tag value";
+	int ok = 0;
+
+	if (dp->tdir_count > 1) {		/* array of values */
+		char* cp = NULL;
+
+		switch (dp->tdir_type) {
+		case TIFF_BYTE:
+		case TIFF_SBYTE:
+			/* NB: always expand BYTE values to shorts */
+			cp = CheckMalloc(tif,
+			    dp->tdir_count * sizeof (uint16), mesg);
+			ok = cp && TIFFFetchByteArray(tif, dp, (uint16*) cp);
+			break;
+		case TIFF_SHORT:
+		case TIFF_SSHORT:
+			cp = CheckMalloc(tif,
+			    dp->tdir_count * sizeof (uint16), mesg);
+			ok = cp && TIFFFetchShortArray(tif, dp, (uint16*) cp);
+			break;
+		case TIFF_LONG:
+		case TIFF_SLONG:
+			cp = CheckMalloc(tif,
+			    dp->tdir_count * sizeof (uint32), mesg);
+			ok = cp && TIFFFetchLongArray(tif, dp, (uint32*) cp);
+			break;
+		case TIFF_RATIONAL:
+		case TIFF_SRATIONAL:
+			cp = CheckMalloc(tif,
+			    dp->tdir_count * sizeof (float), mesg);
+			ok = cp && TIFFFetchRationalArray(tif, dp, (float*) cp);
+			break;
+		case TIFF_FLOAT:
+			cp = CheckMalloc(tif,
+			    dp->tdir_count * sizeof (float), mesg);
+			ok = cp && TIFFFetchFloatArray(tif, dp, (float*) cp);
+			break;
+		case TIFF_DOUBLE:
+			cp = CheckMalloc(tif,
+			    dp->tdir_count * sizeof (double), mesg);
+			ok = cp && TIFFFetchDoubleArray(tif, dp, (double*) cp);
+			break;
+		case TIFF_ASCII:
+		case TIFF_UNDEFINED:		/* bit of a cheat... */
+			/*
+			 * Some vendors write strings w/o the trailing
+			 * NULL byte, so always append one just in case.
+			 */
+			cp = CheckMalloc(tif, dp->tdir_count+1, mesg);
+			if (ok = (cp && TIFFFetchString(tif, dp, cp)))
+				cp[dp->tdir_count] = '\0';	/* XXX */
+			break;
+		}
+		if (ok) {
+			ok = (fip->field_passcount ?
+			    (*setFieldFn)(tif, dp->tdir_tag, dp->tdir_count, cp)
+			  : (*setFieldFn)(tif, dp->tdir_tag, cp));
+		}
+		if (cp != NULL)
+			_TIFFfree(cp);
+	} else if (CheckDirCount(tif, dp, 1)) {	/* singleton value */
+		switch (dp->tdir_type) {
+		case TIFF_BYTE:
+		case TIFF_SBYTE:
+		case TIFF_SHORT:
+		case TIFF_SSHORT:
+			/*
+			 * If the tag is also acceptable as a LONG or SLONG
+			 * then (*setFieldFn) will expect an uint32 parameter
+			 * passed to it (through varargs).  Thus, for machines
+			 * where sizeof (int) != sizeof (uint32) we must do
+			 * a careful check here.  It's hard to say if this
+			 * is worth optimizing.
+			 *
+			 * NB: We use TIFFFieldWithTag here knowing that
+			 *     it returns us the first entry in the table
+			 *     for the tag and that that entry is for the
+			 *     widest potential data type the tag may have.
+			 */
+			{ TIFFDataType type = fip->field_type;
+			  if (type != TIFF_LONG && type != TIFF_SLONG) {
+				uint16 v = (uint16)
+			   TIFFExtractData(tif, dp->tdir_type, dp->tdir_offset);
+				ok = (fip->field_passcount ?
+				    (*setFieldFn)(tif, dp->tdir_tag, 1, &v)
+				  : (*setFieldFn)(tif, dp->tdir_tag, v));
+				break;
+			  }
+			}
+			/* fall thru... */
+		case TIFF_LONG:
+		case TIFF_SLONG:
+			{ uint32 v32 =
+		    TIFFExtractData(tif, dp->tdir_type, dp->tdir_offset);
+			  ok = (fip->field_passcount ? 
+			      (*setFieldFn)(tif, dp->tdir_tag, 1, &v32)
+			    : (*setFieldFn)(tif, dp->tdir_tag, v32));
+			}
+			break;
+		case TIFF_RATIONAL:
+		case TIFF_SRATIONAL:
+		case TIFF_FLOAT:
+			{ float v = (dp->tdir_type == TIFF_FLOAT ? 
+			      TIFFFetchFloat(tif, dp)
+			    : TIFFFetchRational(tif, dp));
+			  ok = (fip->field_passcount ?
+			      (*setFieldFn)(tif, dp->tdir_tag, 1, &v)
+			    : (*setFieldFn)(tif, dp->tdir_tag, v));
+			}
+			break;
+		case TIFF_DOUBLE:
+			{ double v;
+			  ok = (TIFFFetchDoubleArray(tif, dp, &v) &&
+			    (fip->field_passcount ?
+			      (*setFieldFn)(tif, dp->tdir_tag, 1, &v)
+			    : (*setFieldFn)(tif, dp->tdir_tag, v))
+			  );
+			}
+			break;
+		case TIFF_ASCII:
+		case TIFF_UNDEFINED:		/* bit of a cheat... */
+			{ char c[2];
+			  if (ok = (TIFFFetchString(tif, dp, c) != 0)) {
+				c[1] = '\0';		/* XXX paranoid */
+				ok = (*setFieldFn)(tif, dp->tdir_tag, c);
+			  }
+			}
+			break;
+		}
+	}
+	return (ok);
+}
+
+/* Everything after this is exactly duplicated from the standard tif_dirread.c
+   file, necessitated by the fact that they are declared static there so
+   we can't call them!
+*/
+#define	NITEMS(x)	(sizeof (x) / sizeof (x[0]))
+/*
+ * Fetch samples/pixel short values for 
+ * the specified tag and verify that
+ * all values are the same.
+ */
+static int
+TIFFFetchPerSampleShorts(TIFF* tif, TIFFDirEntry* dir, int* pl)
+{
+	int samples = tif->tif_dir.td_samplesperpixel;
+	int status = 0;
+
+	if (CheckDirCount(tif, dir, (uint32) samples)) {
+		uint16 buf[10];
+		uint16* v = buf;
+
+		if (samples > NITEMS(buf))
+			v = (uint16*) _TIFFmalloc(samples * sizeof (uint16));
+		if (TIFFFetchShortArray(tif, dir, v)) {
+			int i;
+			for (i = 1; i < samples; i++)
+				if (v[i] != v[0]) {
+					TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+		"Cannot handle different per-sample values for field \"%s\"",
+			   _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
+					goto bad;
+				}
+			*pl = v[0];
+			status = 1;
+		}
+	bad:
+		if (v != buf)
+			_TIFFfree((char*) v);
+	}
+	return (status);
+}
+
+/*
+ * Fetch samples/pixel ANY values for 
+ * the specified tag and verify that
+ * all values are the same.
+ */
+static int
+TIFFFetchPerSampleAnys(TIFF* tif, TIFFDirEntry* dir, double* pl)
+{
+	int samples = (int) tif->tif_dir.td_samplesperpixel;
+	int status = 0;
+
+	if (CheckDirCount(tif, dir, (uint32) samples)) {
+		double buf[10];
+		double* v = buf;
+
+		if (samples > NITEMS(buf))
+			v = (double*) _TIFFmalloc(samples * sizeof (double));
+		if (TIFFFetchAnyArray(tif, dir, v)) {
+			int i;
+			for (i = 1; i < samples; i++)
+				if (v[i] != v[0]) {
+					TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+		"Cannot handle different per-sample values for field \"%s\"",
+			   _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
+					goto bad;
+				}
+			*pl = v[0];
+			status = 1;
+		}
+	bad:
+		if (v != buf)
+			_TIFFfree(v);
+	}
+	return (status);
+}
+#undef NITEMS
+
+/*
+ * Fetch a set of offsets or lengths.
+ * While this routine says "strips",
+ * in fact it's also used for tiles.
+ */
+static int
+TIFFFetchStripThing(TIFF* tif, TIFFDirEntry* dir, long nstrips, uint32** lpp)
+{
+	register uint32* lp;
+	int status;
+
+	if (!CheckDirCount(tif, dir, (uint32) nstrips))
+		return (0);
+	/*
+	 * Allocate space for strip information.
+	 */
+	if (*lpp == NULL &&
+	    (*lpp = (uint32 *)CheckMalloc(tif,
+	      nstrips * sizeof (uint32), "for strip array")) == NULL)
+		return (0);
+	lp = *lpp;
+	if (dir->tdir_type == (int)TIFF_SHORT) {
+		/*
+		 * Handle uint16->uint32 expansion.
+		 */
+		uint16* dp = (uint16*) CheckMalloc(tif,
+		    dir->tdir_count* sizeof (uint16), "to fetch strip tag");
+		if (dp == NULL)
+			return (0);
+		if (status = TIFFFetchShortArray(tif, dir, dp)) {
+			register uint16* wp = dp;
+			while (nstrips-- > 0)
+				*lp++ = *wp++;
+		}
+		_TIFFfree((char*) dp);
+	} else
+		status = TIFFFetchLongArray(tif, dir, lp);
+	return (status);
+}
+
+#define	NITEMS(x)	(sizeof (x) / sizeof (x[0]))
+/*
+ * Fetch and set the ExtraSamples tag.
+ */
+static int
+TIFFFetchExtraSamples(TIFF* tif, TIFFDirEntry* dir)
+{
+	uint16 buf[10];
+	uint16* v = buf;
+	int status;
+
+	if (dir->tdir_count > NITEMS(buf))
+		v = (uint16*) _TIFFmalloc(dir->tdir_count * sizeof (uint16));
+	if (dir->tdir_type == TIFF_BYTE)
+		status = TIFFFetchByteArray(tif, dir, v);
+	else
+		status = TIFFFetchShortArray(tif, dir, v);
+	if (status)
+		status = TIFFSetField(tif, dir->tdir_tag, dir->tdir_count, v);
+	if (v != buf)
+		_TIFFfree((char*) v);
+	return (status);
+}
+#undef NITEMS
+
+#ifdef COLORIMETRY_SUPPORT
+/*
+ * Fetch and set the RefBlackWhite tag.
+ */
+static int
+TIFFFetchRefBlackWhite(TIFF* tif, TIFFDirEntry* dir)
+{
+	static char mesg[] = "for \"ReferenceBlackWhite\" array";
+	char* cp;
+	int ok;
+
+	if (dir->tdir_type == TIFF_RATIONAL)
+		return (1/*TIFFFetchNormalTag(tif, dir) just so linker won't complain - this part of the code is never used anyway */);
+	/*
+	 * Handle LONG's for backward compatibility.
+	 */
+	cp = CheckMalloc(tif, dir->tdir_count * sizeof (uint32), mesg);
+	if (ok = (cp && TIFFFetchLongArray(tif, dir, (uint32*) cp))) {
+		float* fp = (float*)
+		    CheckMalloc(tif, dir->tdir_count * sizeof (float), mesg);
+		if (ok = (fp != NULL)) {
+			uint32 i;
+			for (i = 0; i < dir->tdir_count; i++)
+				fp[i] = (float)((uint32*) cp)[i];
+			ok = TIFFSetField(tif, dir->tdir_tag, fp);
+			_TIFFfree((char*) fp);
+		}
+	}
+	if (cp)
+		_TIFFfree(cp);
+	return (ok);
+}
+#endif
+
+#if STRIPCHOP_SUPPORT
+/*
+ * Replace a single strip (tile) of uncompressed data by
+ * multiple strips (tiles), each approximately 8Kbytes.
+ * This is useful for dealing with large images or
+ * for dealing with machines with a limited amount
+ * memory.
+ */
+static void
+ChopUpSingleUncompressedStrip(TIFF* tif)
+{
+	register TIFFDirectory *td = &tif->tif_dir;
+	uint32 bytecount = td->td_stripbytecount[0];
+	uint32 offset = td->td_stripoffset[0];
+	tsize_t rowbytes = TIFFVTileSize(tif, 1), stripbytes;
+	tstrip_t strip, nstrips, rowsperstrip;
+	uint32* newcounts;
+	uint32* newoffsets;
+
+	/*
+	 * Make the rows hold at least one
+	 * scanline, but fill 8k if possible.
+	 */
+	if (rowbytes > 8192) {
+		stripbytes = rowbytes;
+		rowsperstrip = 1;
+	} else {
+		rowsperstrip = 8192 / rowbytes;
+		stripbytes = rowbytes * rowsperstrip;
+	}
+	/* never increase the number of strips in an image */
+	if (rowsperstrip >= td->td_rowsperstrip)
+		return;
+	nstrips = (tstrip_t) TIFFhowmany(bytecount, stripbytes);
+	newcounts = (uint32*) CheckMalloc(tif, nstrips * sizeof (uint32),
+				"for chopped \"StripByteCounts\" array");
+	newoffsets = (uint32*) CheckMalloc(tif, nstrips * sizeof (uint32),
+				"for chopped \"StripOffsets\" array");
+	if (newcounts == NULL || newoffsets == NULL) {
+	        /*
+		 * Unable to allocate new strip information, give
+		 * up and use the original one strip information.
+		 */
+		if (newcounts != NULL)
+			_TIFFfree(newcounts);
+		if (newoffsets != NULL)
+			_TIFFfree(newoffsets);
+		return;
+	}
+	/*
+	 * Fill the strip information arrays with
+	 * new bytecounts and offsets that reflect
+	 * the broken-up format.
+	 */
+	for (strip = 0; strip < nstrips; strip++) {
+		if (stripbytes > bytecount)
+			stripbytes = bytecount;
+		newcounts[strip] = stripbytes;
+		newoffsets[strip] = offset;
+		offset += stripbytes;
+		bytecount -= stripbytes;
+	}
+	/*
+	 * Replace old single strip info with multi-strip info.
+	 */
+	td->td_stripsperimage = td->td_nstrips = nstrips;
+	TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
+
+	_TIFFfree(td->td_stripbytecount);
+	_TIFFfree(td->td_stripoffset);
+	td->td_stripbytecount = newcounts;
+	td->td_stripoffset = newoffsets;
+}
+#endif /* STRIPCHOP_SUPPORT */
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 8
+ * fill-column: 78
+ * End:
+ */