XFA: Upgrade to libtiff 4.0.6.

third_party/tiff_v403/tif_lzw.c

Index: third_party/tiff_v403/tif_lzw.c
diff --git a/third_party/tiff_v403/tif_lzw.c b/third_party/tiff_v403/tif_lzw.c
deleted file mode 100644
index 3a6f4c82c7760fa746ae9a432c8cb109e379be6c..0000000000000000000000000000000000000000
--- a/third_party/tiff_v403/tif_lzw.c
+++ /dev/null
@@ -1,1167 +0,0 @@
-/* $Id: tif_lzw.c,v 1.45 2011-04-02 20:54:09 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.
- */
-#include "tiffiop.h"
-#ifdef LZW_SUPPORT
-/*
- * TIFF Library.  
- * Rev 5.0 Lempel-Ziv & Welch Compression Support
- *
- * This code is derived from the compress program whose code is
- * derived from software contributed to Berkeley by James A. Woods,
- * derived from original work by Spencer Thomas and Joseph Orost.
- *
- * The original Berkeley copyright notice appears below in its entirety.
- */
-#include "tif_predict.h"
-
-#include <stdio.h>
-
-/*
- * NB: The 5.0 spec describes a different algorithm than Aldus
- *     implements.  Specifically, Aldus does code length transitions
- *     one code earlier than should be done (for real LZW).
- *     Earlier versions of this library implemented the correct
- *     LZW algorithm, but emitted codes in a bit order opposite
- *     to the TIFF spec.  Thus, to maintain compatibility w/ Aldus
- *     we interpret MSB-LSB ordered codes to be images written w/
- *     old versions of this library, but otherwise adhere to the
- *     Aldus "off by one" algorithm.
- *
- * Future revisions to the TIFF spec are expected to "clarify this issue".
- */
-#define LZW_COMPAT              /* include backwards compatibility code */
-/*
- * Each strip of data is supposed to be terminated by a CODE_EOI.
- * If the following #define is included, the decoder will also
- * check for end-of-strip w/o seeing this code.  This makes the
- * library more robust, but also slower.
- */
-#define LZW_CHECKEOS            /* include checks for strips w/o EOI code */
-
-#define MAXCODE(n)	((1L<<(n))-1)
-/*
- * The TIFF spec specifies that encoded bit
- * strings range from 9 to 12 bits.
- */
-#define BITS_MIN        9               /* start with 9 bits */
-#define BITS_MAX        12              /* max of 12 bit strings */
-/* predefined codes */
-#define CODE_CLEAR      256             /* code to clear string table */
-#define CODE_EOI        257             /* end-of-information code */
-#define CODE_FIRST      258             /* first free code entry */
-#define CODE_MAX        MAXCODE(BITS_MAX)
-#define HSIZE           9001L           /* 91% occupancy */
-#define HSHIFT          (13-8)
-#ifdef LZW_COMPAT
-/* NB: +1024 is for compatibility with old files */
-#define CSIZE           (MAXCODE(BITS_MAX)+1024L)
-#else
-#define CSIZE           (MAXCODE(BITS_MAX)+1L)
-#endif
-
-/*
- * State block for each open TIFF file using LZW
- * compression/decompression.  Note that the predictor
- * state block must be first in this data structure.
- */
-typedef struct {
-	TIFFPredictorState predict;     /* predictor super class */
-
-	unsigned short  nbits;          /* # of bits/code */
-	unsigned short  maxcode;        /* maximum code for lzw_nbits */
-	unsigned short  free_ent;       /* next free entry in hash table */
-	long            nextdata;       /* next bits of i/o */
-	long            nextbits;       /* # of valid bits in lzw_nextdata */
-
-	int             rw_mode;        /* preserve rw_mode from init */
-} LZWBaseState;
-
-#define lzw_nbits       base.nbits
-#define lzw_maxcode     base.maxcode
-#define lzw_free_ent    base.free_ent
-#define lzw_nextdata    base.nextdata
-#define lzw_nextbits    base.nextbits
-
-/*
- * Encoding-specific state.
- */
-typedef uint16 hcode_t;			/* codes fit in 16 bits */
-typedef struct {
-	long	hash;
-	hcode_t	code;
-} hash_t;
-
-/*
- * Decoding-specific state.
- */
-typedef struct code_ent {
-	struct code_ent *next;
-	unsigned short	length;		/* string len, including this token */
-	unsigned char	value;		/* data value */
-	unsigned char	firstchar;	/* first token of string */
-} code_t;
-
-typedef int (*decodeFunc)(TIFF*, uint8*, tmsize_t, uint16);
-
-typedef struct {
-	LZWBaseState base;
-
-	/* Decoding specific data */
-	long    dec_nbitsmask;		/* lzw_nbits 1 bits, right adjusted */
-	long    dec_restart;		/* restart count */
-#ifdef LZW_CHECKEOS
-	uint64  dec_bitsleft;		/* available bits in raw data */
-#endif
-	decodeFunc dec_decode;		/* regular or backwards compatible */
-	code_t* dec_codep;		/* current recognized code */
-	code_t* dec_oldcodep;		/* previously recognized code */
-	code_t* dec_free_entp;		/* next free entry */
-	code_t* dec_maxcodep;		/* max available entry */
-	code_t* dec_codetab;		/* kept separate for small machines */
-
-	/* Encoding specific data */
-	int     enc_oldcode;		/* last code encountered */
-	long    enc_checkpoint;		/* point at which to clear table */
-#define CHECK_GAP	10000		/* enc_ratio check interval */
-	long    enc_ratio;		/* current compression ratio */
-	long    enc_incount;		/* (input) data bytes encoded */
-	long    enc_outcount;		/* encoded (output) bytes */
-	uint8*  enc_rawlimit;		/* bound on tif_rawdata buffer */
-	hash_t* enc_hashtab;		/* kept separate for small machines */
-} LZWCodecState;
-
-#define LZWState(tif)		((LZWBaseState*) (tif)->tif_data)
-#define DecoderState(tif)	((LZWCodecState*) LZWState(tif))
-#define EncoderState(tif)	((LZWCodecState*) LZWState(tif))
-
-static int LZWDecode(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s);
-#ifdef LZW_COMPAT
-static int LZWDecodeCompat(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s);
-#endif
-static void cl_hash(LZWCodecState*);
-
-/*
- * LZW Decoder.
- */
-
-#ifdef LZW_CHECKEOS
-/*
- * This check shouldn't be necessary because each
- * strip is suppose to be terminated with CODE_EOI.
- */
-#define	NextCode(_tif, _sp, _bp, _code, _get) {				\
-	if ((_sp)->dec_bitsleft < (uint64)nbits) {			\
-		TIFFWarningExt(_tif->tif_clientdata, module,		\
-		    "LZWDecode: Strip %d not terminated with EOI code", \
-		    _tif->tif_curstrip);				\
-		_code = CODE_EOI;					\
-	} else {							\
-		_get(_sp,_bp,_code);					\
-		(_sp)->dec_bitsleft -= nbits;				\
-	}								\
-}
-#else
-#define	NextCode(tif, sp, bp, code, get) get(sp, bp, code)
-#endif
-
-static int
-LZWFixupTags(TIFF* tif)
-{
-	(void) tif;
-	return (1);
-}
-
-static int
-LZWSetupDecode(TIFF* tif)
-{
-	static const char module[] = "LZWSetupDecode";
-	LZWCodecState* sp = DecoderState(tif);
-	int code;
-
-	if( sp == NULL )
-	{
-		/*
-		 * Allocate state block so tag methods have storage to record
-		 * values.
-		*/
-		tif->tif_data = (uint8*) _TIFFmalloc(sizeof(LZWCodecState));
-		if (tif->tif_data == NULL)
-		{
-			TIFFErrorExt(tif->tif_clientdata, module, "No space for LZW state block");
-			return (0);
-		}
-
-		DecoderState(tif)->dec_codetab = NULL;
-		DecoderState(tif)->dec_decode = NULL;
-
-		/*
-		 * Setup predictor setup.
-		 */
-		(void) TIFFPredictorInit(tif);
-
-		sp = DecoderState(tif);
-	}
-
-	assert(sp != NULL);
-
-	if (sp->dec_codetab == NULL) {
-		sp->dec_codetab = (code_t*)_TIFFmalloc(CSIZE*sizeof (code_t));
-		if (sp->dec_codetab == NULL) {
-			TIFFErrorExt(tif->tif_clientdata, module,
-				     "No space for LZW code table");
-			return (0);
-		}
-		/*
-		 * Pre-load the table.
-		 */
-		code = 255;
-		do {
-			sp->dec_codetab[code].value = code;
-			sp->dec_codetab[code].firstchar = code;
-			sp->dec_codetab[code].length = 1;
-			sp->dec_codetab[code].next = NULL;
-		} while (code--);
-		/*
-		 * Zero-out the unused entries
-                 */
-                 _TIFFmemset(&sp->dec_codetab[CODE_CLEAR], 0,
-			     (CODE_FIRST - CODE_CLEAR) * sizeof (code_t));
-	}
-	return (1);
-}
-
-/*
- * Setup state for decoding a strip.
- */
-static int
-LZWPreDecode(TIFF* tif, uint16 s)
-{
-	static const char module[] = "LZWPreDecode";
-	LZWCodecState *sp = DecoderState(tif);
-
-	(void) s;
-	assert(sp != NULL);
-	if( sp->dec_codetab == NULL )
-        {
-            tif->tif_setupdecode( tif );
-        }
-
-	/*
-	 * Check for old bit-reversed codes.
-	 */
-	if (tif->tif_rawdata[0] == 0 && (tif->tif_rawdata[1] & 0x1)) {
-#ifdef LZW_COMPAT
-		if (!sp->dec_decode) {
-			TIFFWarningExt(tif->tif_clientdata, module,
-			    "Old-style LZW codes, convert file");
-			/*
-			 * Override default decoding methods with
-			 * ones that deal with the old coding.
-			 * Otherwise the predictor versions set
-			 * above will call the compatibility routines
-			 * through the dec_decode method.
-			 */
-			tif->tif_decoderow = LZWDecodeCompat;
-			tif->tif_decodestrip = LZWDecodeCompat;
-			tif->tif_decodetile = LZWDecodeCompat;
-			/*
-			 * If doing horizontal differencing, must
-			 * re-setup the predictor logic since we
-			 * switched the basic decoder methods...
-			 */
-			(*tif->tif_setupdecode)(tif);
-			sp->dec_decode = LZWDecodeCompat;
-		}
-		sp->lzw_maxcode = MAXCODE(BITS_MIN);
-#else /* !LZW_COMPAT */
-		if (!sp->dec_decode) {
-			TIFFErrorExt(tif->tif_clientdata, module,
-			    "Old-style LZW codes not supported");
-			sp->dec_decode = LZWDecode;
-		}
-		return (0);
-#endif/* !LZW_COMPAT */
-	} else {
-		sp->lzw_maxcode = MAXCODE(BITS_MIN)-1;
-		sp->dec_decode = LZWDecode;
-	}
-	sp->lzw_nbits = BITS_MIN;
-	sp->lzw_nextbits = 0;
-	sp->lzw_nextdata = 0;
-
-	sp->dec_restart = 0;
-	sp->dec_nbitsmask = MAXCODE(BITS_MIN);
-#ifdef LZW_CHECKEOS
-	sp->dec_bitsleft = ((uint64)tif->tif_rawcc) << 3;
-#endif
-	sp->dec_free_entp = sp->dec_codetab + CODE_FIRST;
-	/*
-	 * Zero entries that are not yet filled in.  We do
-	 * this to guard against bogus input data that causes
-	 * us to index into undefined entries.  If you can
-	 * come up with a way to safely bounds-check input codes
-	 * while decoding then you can remove this operation.
-	 */
-	_TIFFmemset(sp->dec_free_entp, 0, (CSIZE-CODE_FIRST)*sizeof (code_t));
-	sp->dec_oldcodep = &sp->dec_codetab[-1];
-	sp->dec_maxcodep = &sp->dec_codetab[sp->dec_nbitsmask-1];
-	return (1);
-}
-
-/*
- * Decode a "hunk of data".
- */
-#define	GetNextCode(sp, bp, code) {				\
-	nextdata = (nextdata<<8) | *(bp)++;			\
-	nextbits += 8;						\
-	if (nextbits < nbits) {					\
-		nextdata = (nextdata<<8) | *(bp)++;		\
-		nextbits += 8;					\
-	}							\
-	code = (hcode_t)((nextdata >> (nextbits-nbits)) & nbitsmask);	\
-	nextbits -= nbits;					\
-}
-
-static void
-codeLoop(TIFF* tif, const char* module)
-{
-	TIFFErrorExt(tif->tif_clientdata, module,
-	    "Bogus encoding, loop in the code table; scanline %d",
-	    tif->tif_row);
-}
-
-static int
-LZWDecode(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s)
-{
-	static const char module[] = "LZWDecode";
-	LZWCodecState *sp = DecoderState(tif);
-	char *op = (char*) op0;
-	long occ = (long) occ0;
-	char *tp;
-	unsigned char *bp;
-	hcode_t code;
-	int len;
-	long nbits, nextbits, nextdata, nbitsmask;
-	code_t *codep, *free_entp, *maxcodep, *oldcodep;
-
-	(void) s;
-	assert(sp != NULL);
-        assert(sp->dec_codetab != NULL);
-
-	/*
-	  Fail if value does not fit in long.
-	*/
-	if ((tmsize_t) occ != occ0)
-	        return (0);
-	/*
-	 * Restart interrupted output operation.
-	 */
-	if (sp->dec_restart) {
-		long residue;
-
-		codep = sp->dec_codep;
-		residue = codep->length - sp->dec_restart;
-		if (residue > occ) {
-			/*
-			 * Residue from previous decode is sufficient
-			 * to satisfy decode request.  Skip to the
-			 * start of the decoded string, place decoded
-			 * values in the output buffer, and return.
-			 */
-			sp->dec_restart += occ;
-			do {
-				codep = codep->next;
-			} while (--residue > occ && codep);
-			if (codep) {
-				tp = op + occ;
-				do {
-					*--tp = codep->value;
-					codep = codep->next;
-				} while (--occ && codep);
-			}
-			return (1);
-		}
-		/*
-		 * Residue satisfies only part of the decode request.
-		 */
-		op += residue, occ -= residue;
-		tp = op;
-		do {
-			int t;
-			--tp;
-			t = codep->value;
-			codep = codep->next;
-			*tp = t;
-		} while (--residue && codep);
-		sp->dec_restart = 0;
-	}
-
-	bp = (unsigned char *)tif->tif_rawcp;
-	nbits = sp->lzw_nbits;
-	nextdata = sp->lzw_nextdata;
-	nextbits = sp->lzw_nextbits;
-	nbitsmask = sp->dec_nbitsmask;
-	oldcodep = sp->dec_oldcodep;
-	free_entp = sp->dec_free_entp;
-	maxcodep = sp->dec_maxcodep;
-
-	while (occ > 0) {
-		NextCode(tif, sp, bp, code, GetNextCode);
-		if (code == CODE_EOI)
-			break;
-		if (code == CODE_CLEAR) {
-			free_entp = sp->dec_codetab + CODE_FIRST;
-			_TIFFmemset(free_entp, 0,
-				    (CSIZE - CODE_FIRST) * sizeof (code_t));
-			nbits = BITS_MIN;
-			nbitsmask = MAXCODE(BITS_MIN);
-			maxcodep = sp->dec_codetab + nbitsmask-1;
-			NextCode(tif, sp, bp, code, GetNextCode);
-			if (code == CODE_EOI)
-				break;
-			if (code >= CODE_CLEAR) {
-				TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
-				"LZWDecode: Corrupted LZW table at scanline %d",
-					     tif->tif_row);
-				return (0);
-			}
-			*op++ = (char)code, occ--;
-			oldcodep = sp->dec_codetab + code;
-			continue;
-		}
-		codep = sp->dec_codetab + code;
-
-		/*
-		 * Add the new entry to the code table.
-		 */
-		if (free_entp < &sp->dec_codetab[0] ||
-		    free_entp >= &sp->dec_codetab[CSIZE]) {
-			TIFFErrorExt(tif->tif_clientdata, module,
-			    "Corrupted LZW table at scanline %d",
-			    tif->tif_row);
-			return (0);
-		}
-
-		free_entp->next = oldcodep;
-		if (free_entp->next < &sp->dec_codetab[0] ||
-		    free_entp->next >= &sp->dec_codetab[CSIZE]) {
-			TIFFErrorExt(tif->tif_clientdata, module,
-			    "Corrupted LZW table at scanline %d",
-			    tif->tif_row);
-			return (0);
-		}
-		free_entp->firstchar = free_entp->next->firstchar;
-		free_entp->length = free_entp->next->length+1;
-		free_entp->value = (codep < free_entp) ?
-		    codep->firstchar : free_entp->firstchar;
-		if (++free_entp > maxcodep) {
-			if (++nbits > BITS_MAX)		/* should not happen */
-				nbits = BITS_MAX;
-			nbitsmask = MAXCODE(nbits);
-			maxcodep = sp->dec_codetab + nbitsmask-1;
-		}
-		oldcodep = codep;
-		if (code >= 256) {
-			/*
-			 * Code maps to a string, copy string
-			 * value to output (written in reverse).
-			 */
-			if(codep->length == 0) {
-				TIFFErrorExt(tif->tif_clientdata, module,
-				    "Wrong length of decoded string: "
-				    "data probably corrupted at scanline %d",
-				    tif->tif_row);
-				return (0);
-			}
-			if (codep->length > occ) {
-				/*
-				 * String is too long for decode buffer,
-				 * locate portion that will fit, copy to
-				 * the decode buffer, and setup restart
-				 * logic for the next decoding call.
-				 */
-				sp->dec_codep = codep;
-				do {
-					codep = codep->next;
-				} while (codep && codep->length > occ);
-				if (codep) {
-					sp->dec_restart = (long)occ;
-					tp = op + occ;
-					do  {
-						*--tp = codep->value;
-						codep = codep->next;
-					}  while (--occ && codep);
-					if (codep)
-						codeLoop(tif, module);
-				}
-				break;
-			}
-			len = codep->length;
-			tp = op + len;
-			do {
-				int t;
-				--tp;
-				t = codep->value;
-				codep = codep->next;
-				*tp = t;
-			} while (codep && tp > op);
-			if (codep) {
-			    codeLoop(tif, module);
-			    break;
-			}
-			assert(occ >= len);
-			op += len, occ -= len;
-		} else
-			*op++ = (char)code, occ--;
-	}
-
-	tif->tif_rawcp = (uint8*) bp;
-	sp->lzw_nbits = (unsigned short) nbits;
-	sp->lzw_nextdata = nextdata;
-	sp->lzw_nextbits = nextbits;
-	sp->dec_nbitsmask = nbitsmask;
-	sp->dec_oldcodep = oldcodep;
-	sp->dec_free_entp = free_entp;
-	sp->dec_maxcodep = maxcodep;
-
-	if (occ > 0) {
-#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
-		TIFFErrorExt(tif->tif_clientdata, module,
-			"Not enough data at scanline %d (short %I64d bytes)",
-			     tif->tif_row, (unsigned __int64) occ);
-#else
-		TIFFErrorExt(tif->tif_clientdata, module,
-			"Not enough data at scanline %d (short %llu bytes)",
-			     tif->tif_row, (unsigned long long) occ);
-#endif
-		return (0);
-	}
-	return (1);
-}
-
-#ifdef LZW_COMPAT
-/*
- * Decode a "hunk of data" for old images.
- */
-#define	GetNextCodeCompat(sp, bp, code) {			\
-	nextdata |= (unsigned long) *(bp)++ << nextbits;	\
-	nextbits += 8;						\
-	if (nextbits < nbits) {					\
-		nextdata |= (unsigned long) *(bp)++ << nextbits;\
-		nextbits += 8;					\
-	}							\
-	code = (hcode_t)(nextdata & nbitsmask);			\
-	nextdata >>= nbits;					\
-	nextbits -= nbits;					\
-}
-
-static int
-LZWDecodeCompat(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s)
-{
-	static const char module[] = "LZWDecodeCompat";
-	LZWCodecState *sp = DecoderState(tif);
-	char *op = (char*) op0;
-	long occ = (long) occ0;
-	char *tp;
-	unsigned char *bp;
-	int code, nbits;
-	long nextbits, nextdata, nbitsmask;
-	code_t *codep, *free_entp, *maxcodep, *oldcodep;
-
-	(void) s;
-	assert(sp != NULL);
-
-	/*
-	  Fail if value does not fit in long.
-	*/
-	if ((tmsize_t) occ != occ0)
-	        return (0);
-
-	/*
-	 * Restart interrupted output operation.
-	 */
-	if (sp->dec_restart) {
-		long residue;
-
-		codep = sp->dec_codep;
-		residue = codep->length - sp->dec_restart;
-		if (residue > occ) {
-			/*
-			 * Residue from previous decode is sufficient
-			 * to satisfy decode request.  Skip to the
-			 * start of the decoded string, place decoded
-			 * values in the output buffer, and return.
-			 */
-			sp->dec_restart += occ;
-			do {
-				codep = codep->next;
-			} while (--residue > occ);
-			tp = op + occ;
-			do {
-				*--tp = codep->value;
-				codep = codep->next;
-			} while (--occ);
-			return (1);
-		}
-		/*
-		 * Residue satisfies only part of the decode request.
-		 */
-		op += residue, occ -= residue;
-		tp = op;
-		do {
-			*--tp = codep->value;
-			codep = codep->next;
-		} while (--residue);
-		sp->dec_restart = 0;
-	}
-
-	bp = (unsigned char *)tif->tif_rawcp;
-	nbits = sp->lzw_nbits;
-	nextdata = sp->lzw_nextdata;
-	nextbits = sp->lzw_nextbits;
-	nbitsmask = sp->dec_nbitsmask;
-	oldcodep = sp->dec_oldcodep;
-	free_entp = sp->dec_free_entp;
-	maxcodep = sp->dec_maxcodep;
-
-	while (occ > 0) {
-		NextCode(tif, sp, bp, code, GetNextCodeCompat);
-		if (code == CODE_EOI)
-			break;
-		if (code == CODE_CLEAR) {
-			free_entp = sp->dec_codetab + CODE_FIRST;
-			_TIFFmemset(free_entp, 0,
-				    (CSIZE - CODE_FIRST) * sizeof (code_t));
-			nbits = BITS_MIN;
-			nbitsmask = MAXCODE(BITS_MIN);
-			maxcodep = sp->dec_codetab + nbitsmask;
-			NextCode(tif, sp, bp, code, GetNextCodeCompat);
-			if (code == CODE_EOI)
-				break;
-			if (code >= CODE_CLEAR) {
-				TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
-				"LZWDecode: Corrupted LZW table at scanline %d",
-					     tif->tif_row);
-				return (0);
-			}
-			*op++ = code, occ--;
-			oldcodep = sp->dec_codetab + code;
-			continue;
-		}
-		codep = sp->dec_codetab + code;
-
-		/*
-		 * Add the new entry to the code table.
-		 */
-		if (free_entp < &sp->dec_codetab[0] ||
-		    free_entp >= &sp->dec_codetab[CSIZE]) {
-			TIFFErrorExt(tif->tif_clientdata, module,
-			    "Corrupted LZW table at scanline %d", tif->tif_row);
-			return (0);
-		}
-
-		free_entp->next = oldcodep;
-		if (free_entp->next < &sp->dec_codetab[0] ||
-		    free_entp->next >= &sp->dec_codetab[CSIZE]) {
-			TIFFErrorExt(tif->tif_clientdata, module,
-			    "Corrupted LZW table at scanline %d", tif->tif_row);
-			return (0);
-		}
-		free_entp->firstchar = free_entp->next->firstchar;
-		free_entp->length = free_entp->next->length+1;
-		free_entp->value = (codep < free_entp) ?
-		    codep->firstchar : free_entp->firstchar;
-		if (++free_entp > maxcodep) {
-			if (++nbits > BITS_MAX)		/* should not happen */
-				nbits = BITS_MAX;
-			nbitsmask = MAXCODE(nbits);
-			maxcodep = sp->dec_codetab + nbitsmask;
-		}
-		oldcodep = codep;
-		if (code >= 256) {
-			/*
-			 * Code maps to a string, copy string
-			 * value to output (written in reverse).
-			 */
-			if(codep->length == 0) {
-				TIFFErrorExt(tif->tif_clientdata, module,
-				    "Wrong length of decoded "
-				    "string: data probably corrupted at scanline %d",
-				    tif->tif_row);
-				return (0);
-			}
-			if (codep->length > occ) {
-				/*
-				 * String is too long for decode buffer,
-				 * locate portion that will fit, copy to
-				 * the decode buffer, and setup restart
-				 * logic for the next decoding call.
-				 */
-				sp->dec_codep = codep;
-				do {
-					codep = codep->next;
-				} while (codep->length > occ);
-				sp->dec_restart = occ;
-				tp = op + occ;
-				do  {
-					*--tp = codep->value;
-					codep = codep->next;
-				}  while (--occ);
-				break;
-			}
-			assert(occ >= codep->length);
-			op += codep->length, occ -= codep->length;
-			tp = op;
-			do {
-				*--tp = codep->value;
-			} while( (codep = codep->next) != NULL );
-		} else
-			*op++ = code, occ--;
-	}
-
-	tif->tif_rawcp = (uint8*) bp;
-	sp->lzw_nbits = nbits;
-	sp->lzw_nextdata = nextdata;
-	sp->lzw_nextbits = nextbits;
-	sp->dec_nbitsmask = nbitsmask;
-	sp->dec_oldcodep = oldcodep;
-	sp->dec_free_entp = free_entp;
-	sp->dec_maxcodep = maxcodep;
-
-	if (occ > 0) {
-#if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
-		TIFFErrorExt(tif->tif_clientdata, module,
-			"Not enough data at scanline %d (short %I64d bytes)",
-			     tif->tif_row, (unsigned __int64) occ);
-#else
-		TIFFErrorExt(tif->tif_clientdata, module,
-			"Not enough data at scanline %d (short %llu bytes)",
-			     tif->tif_row, (unsigned long long) occ);
-#endif
-		return (0);
-	}
-	return (1);
-}
-#endif /* LZW_COMPAT */
-
-/*
- * LZW Encoding.
- */
-
-static int
-LZWSetupEncode(TIFF* tif)
-{
-	static const char module[] = "LZWSetupEncode";
-	LZWCodecState* sp = EncoderState(tif);
-
-	assert(sp != NULL);
-	sp->enc_hashtab = (hash_t*) _TIFFmalloc(HSIZE*sizeof (hash_t));
-	if (sp->enc_hashtab == NULL) {
-		TIFFErrorExt(tif->tif_clientdata, module,
-			     "No space for LZW hash table");
-		return (0);
-	}
-	return (1);
-}
-
-/*
- * Reset encoding state at the start of a strip.
- */
-static int
-LZWPreEncode(TIFF* tif, uint16 s)
-{
-	LZWCodecState *sp = EncoderState(tif);
-
-	(void) s;
-	assert(sp != NULL);
-
-	if( sp->enc_hashtab == NULL )
-        {
-            tif->tif_setupencode( tif );
-        }
-
-	sp->lzw_nbits = BITS_MIN;
-	sp->lzw_maxcode = MAXCODE(BITS_MIN);
-	sp->lzw_free_ent = CODE_FIRST;
-	sp->lzw_nextbits = 0;
-	sp->lzw_nextdata = 0;
-	sp->enc_checkpoint = CHECK_GAP;
-	sp->enc_ratio = 0;
-	sp->enc_incount = 0;
-	sp->enc_outcount = 0;
-	/*
-	 * The 4 here insures there is space for 2 max-sized
-	 * codes in LZWEncode and LZWPostDecode.
-	 */
-	sp->enc_rawlimit = tif->tif_rawdata + tif->tif_rawdatasize-1 - 4;
-	cl_hash(sp);		/* clear hash table */
-	sp->enc_oldcode = (hcode_t) -1;	/* generates CODE_CLEAR in LZWEncode */
-	return (1);
-}
-
-#define	CALCRATIO(sp, rat) {					\
-	if (incount > 0x007fffff) { /* NB: shift will overflow */\
-		rat = outcount >> 8;				\
-		rat = (rat == 0 ? 0x7fffffff : incount/rat);	\
-	} else							\
-		rat = (incount<<8) / outcount;			\
-}
-#define	PutNextCode(op, c) {					\
-	nextdata = (nextdata << nbits) | c;			\
-	nextbits += nbits;					\
-	*op++ = (unsigned char)(nextdata >> (nextbits-8));		\
-	nextbits -= 8;						\
-	if (nextbits >= 8) {					\
-		*op++ = (unsigned char)(nextdata >> (nextbits-8));	\
-		nextbits -= 8;					\
-	}							\
-	outcount += nbits;					\
-}
-
-/*
- * Encode a chunk of pixels.
- *
- * Uses an open addressing double hashing (no chaining) on the 
- * prefix code/next character combination.  We do a variant of
- * Knuth's algorithm D (vol. 3, sec. 6.4) along with G. Knott's
- * relatively-prime secondary probe.  Here, the modular division
- * first probe is gives way to a faster exclusive-or manipulation. 
- * Also do block compression with an adaptive reset, whereby the
- * code table is cleared when the compression ratio decreases,
- * but after the table fills.  The variable-length output codes
- * are re-sized at this point, and a CODE_CLEAR is generated
- * for the decoder. 
- */
-static int
-LZWEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
-{
-	register LZWCodecState *sp = EncoderState(tif);
-	register long fcode;
-	register hash_t *hp;
-	register int h, c;
-	hcode_t ent;
-	long disp;
-	long incount, outcount, checkpoint;
-	long nextdata, nextbits;
-	int free_ent, maxcode, nbits;
-	uint8* op;
-	uint8* limit;
-
-	(void) s;
-	if (sp == NULL)
-		return (0);
-
-        assert(sp->enc_hashtab != NULL);
-
-	/*
-	 * Load local state.
-	 */
-	incount = sp->enc_incount;
-	outcount = sp->enc_outcount;
-	checkpoint = sp->enc_checkpoint;
-	nextdata = sp->lzw_nextdata;
-	nextbits = sp->lzw_nextbits;
-	free_ent = sp->lzw_free_ent;
-	maxcode = sp->lzw_maxcode;
-	nbits = sp->lzw_nbits;
-	op = tif->tif_rawcp;
-	limit = sp->enc_rawlimit;
-	ent = sp->enc_oldcode;
-
-	if (ent == (hcode_t) -1 && cc > 0) {
-		/*
-		 * NB: This is safe because it can only happen
-		 *     at the start of a strip where we know there
-		 *     is space in the data buffer.
-		 */
-		PutNextCode(op, CODE_CLEAR);
-		ent = *bp++; cc--; incount++;
-	}
-	while (cc > 0) {
-		c = *bp++; cc--; incount++;
-		fcode = ((long)c << BITS_MAX) + ent;
-		h = (c << HSHIFT) ^ ent;	/* xor hashing */
-#ifdef _WINDOWS
-		/*
-		 * Check hash index for an overflow.
-		 */
-		if (h >= HSIZE)
-			h -= HSIZE;
-#endif
-		hp = &sp->enc_hashtab[h];
-		if (hp->hash == fcode) {
-			ent = hp->code;
-			continue;
-		}
-		if (hp->hash >= 0) {
-			/*
-			 * Primary hash failed, check secondary hash.
-			 */
-			disp = HSIZE - h;
-			if (h == 0)
-				disp = 1;
-			do {
-				/*
-				 * Avoid pointer arithmetic 'cuz of
-				 * wraparound problems with segments.
-				 */
-				if ((h -= disp) < 0)
-					h += HSIZE;
-				hp = &sp->enc_hashtab[h];
-				if (hp->hash == fcode) {
-					ent = hp->code;
-					goto hit;
-				}
-			} while (hp->hash >= 0);
-		}
-		/*
-		 * New entry, emit code and add to table.
-		 */
-		/*
-		 * Verify there is space in the buffer for the code
-		 * and any potential Clear code that might be emitted
-		 * below.  The value of limit is setup so that there
-		 * are at least 4 bytes free--room for 2 codes.
-		 */
-		if (op > limit) {
-			tif->tif_rawcc = (tmsize_t)(op - tif->tif_rawdata);
-			TIFFFlushData1(tif);
-			op = tif->tif_rawdata;
-		}
-		PutNextCode(op, ent);
-		ent = c;
-		hp->code = free_ent++;
-		hp->hash = fcode;
-		if (free_ent == CODE_MAX-1) {
-			/* table is full, emit clear code and reset */
-			cl_hash(sp);
-			sp->enc_ratio = 0;
-			incount = 0;
-			outcount = 0;
-			free_ent = CODE_FIRST;
-			PutNextCode(op, CODE_CLEAR);
-			nbits = BITS_MIN;
-			maxcode = MAXCODE(BITS_MIN);
-		} else {
-			/*
-			 * If the next entry is going to be too big for
-			 * the code size, then increase it, if possible.
-			 */
-			if (free_ent > maxcode) {
-				nbits++;
-				assert(nbits <= BITS_MAX);
-				maxcode = (int) MAXCODE(nbits);
-			} else if (incount >= checkpoint) {
-				long rat;
-				/*
-				 * Check compression ratio and, if things seem
-				 * to be slipping, clear the hash table and
-				 * reset state.  The compression ratio is a
-				 * 24+8-bit fractional number.
-				 */
-				checkpoint = incount+CHECK_GAP;
-				CALCRATIO(sp, rat);
-				if (rat <= sp->enc_ratio) {
-					cl_hash(sp);
-					sp->enc_ratio = 0;
-					incount = 0;
-					outcount = 0;
-					free_ent = CODE_FIRST;
-					PutNextCode(op, CODE_CLEAR);
-					nbits = BITS_MIN;
-					maxcode = MAXCODE(BITS_MIN);
-				} else
-					sp->enc_ratio = rat;
-			}
-		}
-	hit:
-		;
-	}
-
-	/*
-	 * Restore global state.
-	 */
-	sp->enc_incount = incount;
-	sp->enc_outcount = outcount;
-	sp->enc_checkpoint = checkpoint;
-	sp->enc_oldcode = ent;
-	sp->lzw_nextdata = nextdata;
-	sp->lzw_nextbits = nextbits;
-	sp->lzw_free_ent = free_ent;
-	sp->lzw_maxcode = maxcode;
-	sp->lzw_nbits = nbits;
-	tif->tif_rawcp = op;
-	return (1);
-}
-
-/*
- * Finish off an encoded strip by flushing the last
- * string and tacking on an End Of Information code.
- */
-static int
-LZWPostEncode(TIFF* tif)
-{
-	register LZWCodecState *sp = EncoderState(tif);
-	uint8* op = tif->tif_rawcp;
-	long nextbits = sp->lzw_nextbits;
-	long nextdata = sp->lzw_nextdata;
-	long outcount = sp->enc_outcount;
-	int nbits = sp->lzw_nbits;
-
-	if (op > sp->enc_rawlimit) {
-		tif->tif_rawcc = (tmsize_t)(op - tif->tif_rawdata);
-		TIFFFlushData1(tif);
-		op = tif->tif_rawdata;
-	}
-	if (sp->enc_oldcode != (hcode_t) -1) {
-		PutNextCode(op, sp->enc_oldcode);
-		sp->enc_oldcode = (hcode_t) -1;
-	}
-	PutNextCode(op, CODE_EOI);
-	if (nextbits > 0) 
-		*op++ = (unsigned char)(nextdata << (8-nextbits));
-	tif->tif_rawcc = (tmsize_t)(op - tif->tif_rawdata);
-	return (1);
-}
-
-/*
- * Reset encoding hash table.
- */
-static void
-cl_hash(LZWCodecState* sp)
-{
-	register hash_t *hp = &sp->enc_hashtab[HSIZE-1];
-	register long i = HSIZE-8;
-
-	do {
-		i -= 8;
-		hp[-7].hash = -1;
-		hp[-6].hash = -1;
-		hp[-5].hash = -1;
-		hp[-4].hash = -1;
-		hp[-3].hash = -1;
-		hp[-2].hash = -1;
-		hp[-1].hash = -1;
-		hp[ 0].hash = -1;
-		hp -= 8;
-	} while (i >= 0);
-	for (i += 8; i > 0; i--, hp--)
-		hp->hash = -1;
-}
-
-static void
-LZWCleanup(TIFF* tif)
-{
-	(void)TIFFPredictorCleanup(tif);
-
-	assert(tif->tif_data != 0);
-
-	if (DecoderState(tif)->dec_codetab)
-		_TIFFfree(DecoderState(tif)->dec_codetab);
-
-	if (EncoderState(tif)->enc_hashtab)
-		_TIFFfree(EncoderState(tif)->enc_hashtab);
-
-	_TIFFfree(tif->tif_data);
-	tif->tif_data = NULL;
-
-	_TIFFSetDefaultCompressionState(tif);
-}
-
-int
-TIFFInitLZW(TIFF* tif, int scheme)
-{
-	static const char module[] = "TIFFInitLZW";
-	assert(scheme == COMPRESSION_LZW);
-	/*
-	 * Allocate state block so tag methods have storage to record values.
-	 */
-	tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LZWCodecState));
-	if (tif->tif_data == NULL)
-		goto bad;
-	DecoderState(tif)->dec_codetab = NULL;
-	DecoderState(tif)->dec_decode = NULL;
-	EncoderState(tif)->enc_hashtab = NULL;
-        LZWState(tif)->rw_mode = tif->tif_mode;
-
-	/*
-	 * Install codec methods.
-	 */
-	tif->tif_fixuptags = LZWFixupTags; 
-	tif->tif_setupdecode = LZWSetupDecode;
-	tif->tif_predecode = LZWPreDecode;
-	tif->tif_decoderow = LZWDecode;
-	tif->tif_decodestrip = LZWDecode;
-	tif->tif_decodetile = LZWDecode;
-	tif->tif_setupencode = LZWSetupEncode;
-	tif->tif_preencode = LZWPreEncode;
-	tif->tif_postencode = LZWPostEncode;
-	tif->tif_encoderow = LZWEncode;
-	tif->tif_encodestrip = LZWEncode;
-	tif->tif_encodetile = LZWEncode;
-	tif->tif_cleanup = LZWCleanup;
-	/*
-	 * Setup predictor setup.
-	 */
-	(void) TIFFPredictorInit(tif);
-	return (1);
-bad:
-	TIFFErrorExt(tif->tif_clientdata, module, 
-		     "No space for LZW state block");
-	return (0);
-}
-
-/*
- * Copyright (c) 1985, 1986 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * James A. Woods, derived from original work by Spencer Thomas
- * and Joseph Orost.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by the University of California, Berkeley.  The name of the
- * University may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-#endif /* LZW_SUPPORT */
-
-/* vim: set ts=8 sts=8 sw=8 noet: */
-/*
- * Local Variables:
- * mode: c
- * c-basic-offset: 8
- * fill-column: 78
- * End:
- */
-