--- /dev/null
+/* $Id: tif_fax3.c,v 1.1 2005-06-17 13:54:52 vp153 Exp $ */
+
+/*
+ * Copyright (c) 1990-1997 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 CCITT_SUPPORT
+/*
+ * TIFF Library.
+ *
+ * CCITT Group 3 (T.4) and Group 4 (T.6) Compression Support.
+ *
+ * This file contains support for decoding and encoding TIFF
+ * compression algorithms 2, 3, 4, and 32771.
+ *
+ * Decoder support is derived, with permission, from the code
+ * in Frank Cringle's viewfax program;
+ * Copyright (C) 1990, 1995 Frank D. Cringle.
+ */
+#include "tif_fax3.h"
+#define G3CODES
+#include "t4.h"
+#include <stdio.h>
+
+/*
+ * Compression+decompression state blocks are
+ * derived from this ``base state'' block.
+ */
+typedef struct {
+ int rw_mode; /* O_RDONLY for decode, else encode */
+ int mode; /* operating mode */
+ uint32 rowbytes; /* bytes in a decoded scanline */
+ uint32 rowpixels; /* pixels in a scanline */
+
+ uint16 cleanfaxdata; /* CleanFaxData tag */
+ uint32 badfaxrun; /* BadFaxRun tag */
+ uint32 badfaxlines; /* BadFaxLines tag */
+ uint32 groupoptions; /* Group 3/4 options tag */
+ uint32 recvparams; /* encoded Class 2 session params */
+ char* subaddress; /* subaddress string */
+ uint32 recvtime; /* time spent receiving (secs) */
+ char* faxdcs; /* Table 2/T.30 encoded session params */
+ TIFFVGetMethod vgetparent; /* super-class method */
+ TIFFVSetMethod vsetparent; /* super-class method */
+} Fax3BaseState;
+#define Fax3State(tif) ((Fax3BaseState*) (tif)->tif_data)
+
+typedef enum { G3_1D, G3_2D } Ttag;
+typedef struct {
+ Fax3BaseState b;
+
+ /* Decoder state info */
+ const unsigned char* bitmap; /* bit reversal table */
+ uint32 data; /* current i/o byte/word */
+ int bit; /* current i/o bit in byte */
+ int EOLcnt; /* count of EOL codes recognized */
+ TIFFFaxFillFunc fill; /* fill routine */
+ uint32* runs; /* b&w runs for current/previous row */
+ uint32* refruns; /* runs for reference line */
+ uint32* curruns; /* runs for current line */
+
+ /* Encoder state info */
+ Ttag tag; /* encoding state */
+ unsigned char* refline; /* reference line for 2d decoding */
+ int k; /* #rows left that can be 2d encoded */
+ int maxk; /* max #rows that can be 2d encoded */
+} Fax3CodecState;
+#define DecoderState(tif) ((Fax3CodecState*) Fax3State(tif))
+#define EncoderState(tif) ((Fax3CodecState*) Fax3State(tif))
+
+#define is2DEncoding(sp) \
+ (sp->b.groupoptions & GROUP3OPT_2DENCODING)
+#define isAligned(p,t) ((((unsigned long)(p)) & (sizeof (t)-1)) == 0)
+
+/*
+ * Group 3 and Group 4 Decoding.
+ */
+
+/*
+ * These macros glue the TIFF library state to
+ * the state expected by Frank's decoder.
+ */
+#define DECLARE_STATE(tif, sp, mod) \
+ static const char module[] = mod; \
+ Fax3CodecState* sp = DecoderState(tif); \
+ int a0; /* reference element */ \
+ int lastx = sp->b.rowpixels; /* last element in row */ \
+ uint32 BitAcc; /* bit accumulator */ \
+ int BitsAvail; /* # valid bits in BitAcc */ \
+ int RunLength; /* length of current run */ \
+ unsigned char* cp; /* next byte of input data */ \
+ unsigned char* ep; /* end of input data */ \
+ uint32* pa; /* place to stuff next run */ \
+ uint32* thisrun; /* current row's run array */ \
+ int EOLcnt; /* # EOL codes recognized */ \
+ const unsigned char* bitmap = sp->bitmap; /* input data bit reverser */ \
+ const TIFFFaxTabEnt* TabEnt
+#define DECLARE_STATE_2D(tif, sp, mod) \
+ DECLARE_STATE(tif, sp, mod); \
+ int b1; /* next change on prev line */ \
+ uint32* pb /* next run in reference line */\
+/*
+ * Load any state that may be changed during decoding.
+ */
+#define CACHE_STATE(tif, sp) do { \
+ BitAcc = sp->data; \
+ BitsAvail = sp->bit; \
+ EOLcnt = sp->EOLcnt; \
+ cp = (unsigned char*) tif->tif_rawcp; \
+ ep = cp + tif->tif_rawcc; \
+} while (0)
+/*
+ * Save state possibly changed during decoding.
+ */
+#define UNCACHE_STATE(tif, sp) do { \
+ sp->bit = BitsAvail; \
+ sp->data = BitAcc; \
+ sp->EOLcnt = EOLcnt; \
+ tif->tif_rawcc -= (tidata_t) cp - tif->tif_rawcp; \
+ tif->tif_rawcp = (tidata_t) cp; \
+} while (0)
+
+/*
+ * Setup state for decoding a strip.
+ */
+static int
+Fax3PreDecode(TIFF* tif, tsample_t s)
+{
+ Fax3CodecState* sp = DecoderState(tif);
+
+ (void) s;
+ assert(sp != NULL);
+ sp->bit = 0; /* force initial read */
+ sp->data = 0;
+ sp->EOLcnt = 0; /* force initial scan for EOL */
+ /*
+ * Decoder assumes lsb-to-msb bit order. Note that we select
+ * this here rather than in Fax3SetupState so that viewers can
+ * hold the image open, fiddle with the FillOrder tag value,
+ * and then re-decode the image. Otherwise they'd need to close
+ * and open the image to get the state reset.
+ */
+ sp->bitmap =
+ TIFFGetBitRevTable(tif->tif_dir.td_fillorder != FILLORDER_LSB2MSB);
+ if (sp->refruns) { /* init reference line to white */
+ sp->refruns[0] = (uint32) sp->b.rowpixels;
+ sp->refruns[1] = 0;
+ }
+ return (1);
+}
+
+/*
+ * Routine for handling various errors/conditions.
+ * Note how they are "glued into the decoder" by
+ * overriding the definitions used by the decoder.
+ */
+
+static void
+Fax3Unexpected(const char* module, TIFF* tif, uint32 a0)
+{
+ TIFFError(module, "%s: Bad code word at scanline %d (x %lu)",
+ tif->tif_name, tif->tif_row, (unsigned long) a0);
+}
+#define unexpected(table, a0) Fax3Unexpected(module, tif, a0)
+
+static void
+Fax3Extension(const char* module, TIFF* tif, uint32 a0)
+{
+ TIFFError(module,
+ "%s: Uncompressed data (not supported) at scanline %d (x %lu)",
+ tif->tif_name, tif->tif_row, (unsigned long) a0);
+}
+#define extension(a0) Fax3Extension(module, tif, a0)
+
+static void
+Fax3BadLength(const char* module, TIFF* tif, uint32 a0, uint32 lastx)
+{
+ TIFFWarning(module, "%s: %s at scanline %d (got %lu, expected %lu)",
+ tif->tif_name,
+ a0 < lastx ? "Premature EOL" : "Line length mismatch",
+ tif->tif_row, (unsigned long) a0, (unsigned long) lastx);
+}
+#define badlength(a0,lastx) Fax3BadLength(module, tif, a0, lastx)
+
+static void
+Fax3PrematureEOF(const char* module, TIFF* tif, uint32 a0)
+{
+ TIFFWarning(module, "%s: Premature EOF at scanline %d (x %lu)",
+ tif->tif_name, tif->tif_row, (unsigned long) a0);
+}
+#define prematureEOF(a0) Fax3PrematureEOF(module, tif, a0)
+
+#define Nop
+
+/*
+ * Decode the requested amount of G3 1D-encoded data.
+ */
+static int
+Fax3Decode1D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
+{
+ DECLARE_STATE(tif, sp, "Fax3Decode1D");
+
+ (void) s;
+ CACHE_STATE(tif, sp);
+ thisrun = sp->curruns;
+ while ((long)occ > 0) {
+ a0 = 0;
+ RunLength = 0;
+ pa = thisrun;
+#ifdef FAX3_DEBUG
+ printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
+ printf("-------------------- %d\n", tif->tif_row);
+ fflush(stdout);
+#endif
+ SYNC_EOL(EOF1D);
+ EXPAND1D(EOF1Da);
+ (*sp->fill)(buf, thisrun, pa, lastx);
+ buf += sp->b.rowbytes;
+ occ -= sp->b.rowbytes;
+ continue;
+ EOF1D: /* premature EOF */
+ CLEANUP_RUNS();
+ EOF1Da: /* premature EOF */
+ (*sp->fill)(buf, thisrun, pa, lastx);
+ UNCACHE_STATE(tif, sp);
+ return (-1);
+ }
+ UNCACHE_STATE(tif, sp);
+ return (1);
+}
+
+#define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
+/*
+ * Decode the requested amount of G3 2D-encoded data.
+ */
+static int
+Fax3Decode2D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
+{
+ DECLARE_STATE_2D(tif, sp, "Fax3Decode2D");
+ int is1D; /* current line is 1d/2d-encoded */
+
+ (void) s;
+ CACHE_STATE(tif, sp);
+ while ((long)occ > 0) {
+ a0 = 0;
+ RunLength = 0;
+ pa = thisrun = sp->curruns;
+#ifdef FAX3_DEBUG
+ printf("\nBitAcc=%08X, BitsAvail = %d EOLcnt = %d",
+ BitAcc, BitsAvail, EOLcnt);
+#endif
+ SYNC_EOL(EOF2D);
+ NeedBits8(1, EOF2D);
+ is1D = GetBits(1); /* 1D/2D-encoding tag bit */
+ ClrBits(1);
+#ifdef FAX3_DEBUG
+ printf(" %s\n-------------------- %d\n",
+ is1D ? "1D" : "2D", tif->tif_row);
+ fflush(stdout);
+#endif
+ pb = sp->refruns;
+ b1 = *pb++;
+ if (is1D)
+ EXPAND1D(EOF2Da);
+ else
+ EXPAND2D(EOF2Da);
+ (*sp->fill)(buf, thisrun, pa, lastx);
+ SETVAL(0); /* imaginary change for reference */
+ SWAP(uint32*, sp->curruns, sp->refruns);
+ buf += sp->b.rowbytes;
+ occ -= sp->b.rowbytes;
+ continue;
+ EOF2D: /* premature EOF */
+ CLEANUP_RUNS();
+ EOF2Da: /* premature EOF */
+ (*sp->fill)(buf, thisrun, pa, lastx);
+ UNCACHE_STATE(tif, sp);
+ return (-1);
+ }
+ UNCACHE_STATE(tif, sp);
+ return (1);
+}
+#undef SWAP
+
+/*
+ * The ZERO & FILL macros must handle spans < 2*sizeof(long) bytes.
+ * For machines with 64-bit longs this is <16 bytes; otherwise
+ * this is <8 bytes. We optimize the code here to reflect the
+ * machine characteristics.
+ */
+#if SIZEOF_LONG == 8
+# define FILL(n, cp) \
+ switch (n) { \
+ case 15:(cp)[14] = 0xff; case 14:(cp)[13] = 0xff; case 13: (cp)[12] = 0xff;\
+ case 12:(cp)[11] = 0xff; case 11:(cp)[10] = 0xff; case 10: (cp)[9] = 0xff;\
+ case 9: (cp)[8] = 0xff; case 8: (cp)[7] = 0xff; case 7: (cp)[6] = 0xff;\
+ case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; case 4: (cp)[3] = 0xff;\
+ case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \
+ case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \
+ }
+# define ZERO(n, cp) \
+ switch (n) { \
+ case 15:(cp)[14] = 0; case 14:(cp)[13] = 0; case 13: (cp)[12] = 0; \
+ case 12:(cp)[11] = 0; case 11:(cp)[10] = 0; case 10: (cp)[9] = 0; \
+ case 9: (cp)[8] = 0; case 8: (cp)[7] = 0; case 7: (cp)[6] = 0; \
+ case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; case 4: (cp)[3] = 0; \
+ case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \
+ case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \
+ }
+#else
+# define FILL(n, cp) \
+ switch (n) { \
+ case 7: (cp)[6] = 0xff; case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; \
+ case 4: (cp)[3] = 0xff; case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \
+ case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \
+ }
+# define ZERO(n, cp) \
+ switch (n) { \
+ case 7: (cp)[6] = 0; case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; \
+ case 4: (cp)[3] = 0; case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \
+ case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \
+ }
+#endif
+
+/*
+ * Bit-fill a row according to the white/black
+ * runs generated during G3/G4 decoding.
+ */
+void
+_TIFFFax3fillruns(unsigned char* buf, uint32* runs, uint32* erun, uint32 lastx)
+{
+ static const unsigned char _fillmasks[] =
+ { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
+ unsigned char* cp;
+ uint32 x, bx, run;
+ int32 n, nw;
+ long* lp;
+
+ if ((erun-runs)&1)
+ *erun++ = 0;
+ x = 0;
+ for (; runs < erun; runs += 2) {
+ run = runs[0];
+ if (x+run > lastx || run > lastx )
+ run = runs[0] = (uint32) (lastx - x);
+ if (run) {
+ cp = buf + (x>>3);
+ bx = x&7;
+ if (run > 8-bx) {
+ if (bx) { /* align to byte boundary */
+ *cp++ &= 0xff << (8-bx);
+ run -= 8-bx;
+ }
+ if( (n = run >> 3) != 0 ) { /* multiple bytes to fill */
+ if ((n/sizeof (long)) > 1) {
+ /*
+ * Align to longword boundary and fill.
+ */
+ for (; n && !isAligned(cp, long); n--)
+ *cp++ = 0x00;
+ lp = (long*) cp;
+ nw = (int32)(n / sizeof (long));
+ n -= nw * sizeof (long);
+ do {
+ *lp++ = 0L;
+ } while (--nw);
+ cp = (unsigned char*) lp;
+ }
+ ZERO(n, cp);
+ run &= 7;
+ }
+ if (run)
+ cp[0] &= 0xff >> run;
+ } else
+ cp[0] &= ~(_fillmasks[run]>>bx);
+ x += runs[0];
+ }
+ run = runs[1];
+ if (x+run > lastx || run > lastx )
+ run = runs[1] = lastx - x;
+ if (run) {
+ cp = buf + (x>>3);
+ bx = x&7;
+ if (run > 8-bx) {
+ if (bx) { /* align to byte boundary */
+ *cp++ |= 0xff >> bx;
+ run -= 8-bx;
+ }
+ if( (n = run>>3) != 0 ) { /* multiple bytes to fill */
+ if ((n/sizeof (long)) > 1) {
+ /*
+ * Align to longword boundary and fill.
+ */
+ for (; n && !isAligned(cp, long); n--)
+ *cp++ = 0xff;
+ lp = (long*) cp;
+ nw = (int32)(n / sizeof (long));
+ n -= nw * sizeof (long);
+ do {
+ *lp++ = -1L;
+ } while (--nw);
+ cp = (unsigned char*) lp;
+ }
+ FILL(n, cp);
+ run &= 7;
+ }
+ if (run)
+ cp[0] |= 0xff00 >> run;
+ } else
+ cp[0] |= _fillmasks[run]>>bx;
+ x += runs[1];
+ }
+ }
+ assert(x == lastx);
+}
+#undef ZERO
+#undef FILL
+
+static char *
+CheckMalloc(TIFF* tif, size_t nmemb, size_t elem_size, const char* what)
+{
+ char *cp = NULL;
+ tsize_t bytes = nmemb * elem_size;
+
+ if (nmemb && elem_size && bytes / elem_size == nmemb)
+ cp = (char*) _TIFFmalloc(bytes);
+
+ if (cp == NULL)
+ TIFFError(tif->tif_name, "No space %s", what);
+
+ return (cp);
+}
+
+/*
+ * Setup G3/G4-related compression/decompression state
+ * before data is processed. This routine is called once
+ * per image -- it sets up different state based on whether
+ * or not decoding or encoding is being done and whether
+ * 1D- or 2D-encoded data is involved.
+ */
+static int
+Fax3SetupState(TIFF* tif)
+{
+ TIFFDirectory* td = &tif->tif_dir;
+ Fax3BaseState* sp = Fax3State(tif);
+ long rowbytes, rowpixels;
+ int needsRefLine;
+ Fax3CodecState* dsp = (Fax3CodecState*) Fax3State(tif);
+ uint32 nruns;
+
+ if (td->td_bitspersample != 1) {
+ TIFFError(tif->tif_name,
+ "Bits/sample must be 1 for Group 3/4 encoding/decoding");
+ return (0);
+ }
+ /*
+ * Calculate the scanline/tile widths.
+ */
+ if (isTiled(tif)) {
+ rowbytes = TIFFTileRowSize(tif);
+ rowpixels = td->td_tilewidth;
+ } else {
+ rowbytes = TIFFScanlineSize(tif);
+ rowpixels = td->td_imagewidth;
+ }
+ sp->rowbytes = (uint32) rowbytes;
+ sp->rowpixels = (uint32) rowpixels;
+ /*
+ * Allocate any additional space required for decoding/encoding.
+ */
+ needsRefLine = (
+ (sp->groupoptions & GROUP3OPT_2DENCODING) ||
+ td->td_compression == COMPRESSION_CCITTFAX4
+ );
+
+ nruns = needsRefLine ? 2*TIFFroundup(rowpixels,32) : rowpixels;
+
+ dsp->runs = (uint32*) CheckMalloc(tif, 2*nruns+3, sizeof (uint32),
+ "for Group 3/4 run arrays");
+ if (dsp->runs == NULL)
+ return (0);
+ dsp->curruns = dsp->runs;
+ if (needsRefLine)
+ dsp->refruns = dsp->runs + (nruns>>1);
+ else
+ dsp->refruns = NULL;
+ if (td->td_compression == COMPRESSION_CCITTFAX3
+ && is2DEncoding(dsp)) { /* NB: default is 1D routine */
+ tif->tif_decoderow = Fax3Decode2D;
+ tif->tif_decodestrip = Fax3Decode2D;
+ tif->tif_decodetile = Fax3Decode2D;
+ }
+
+ if (needsRefLine) { /* 2d encoding */
+ Fax3CodecState* esp = EncoderState(tif);
+ /*
+ * 2d encoding requires a scanline
+ * buffer for the ``reference line''; the
+ * scanline against which delta encoding
+ * is referenced. The reference line must
+ * be initialized to be ``white'' (done elsewhere).
+ */
+ esp->refline = (unsigned char*) _TIFFmalloc(rowbytes);
+ if (esp->refline == NULL) {
+ TIFFError("Fax3SetupState",
+ "%s: No space for Group 3/4 reference line",
+ tif->tif_name);
+ return (0);
+ }
+ } else /* 1d encoding */
+ EncoderState(tif)->refline = NULL;
+
+ return (1);
+}
+
+/*
+ * CCITT Group 3 FAX Encoding.
+ */
+
+#define Fax3FlushBits(tif, sp) { \
+ if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
+ (void) TIFFFlushData1(tif); \
+ *(tif)->tif_rawcp++ = (tidataval_t) (sp)->data; \
+ (tif)->tif_rawcc++; \
+ (sp)->data = 0, (sp)->bit = 8; \
+}
+#define _FlushBits(tif) { \
+ if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
+ (void) TIFFFlushData1(tif); \
+ *(tif)->tif_rawcp++ = (tidataval_t) data; \
+ (tif)->tif_rawcc++; \
+ data = 0, bit = 8; \
+}
+static const int _msbmask[9] =
+ { 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff };
+#define _PutBits(tif, bits, length) { \
+ while (length > bit) { \
+ data |= bits >> (length - bit); \
+ length -= bit; \
+ _FlushBits(tif); \
+ } \
+ data |= (bits & _msbmask[length]) << (bit - length); \
+ bit -= length; \
+ if (bit == 0) \
+ _FlushBits(tif); \
+}
+
+/*
+ * Write a variable-length bit-value to
+ * the output stream. Values are
+ * assumed to be at most 16 bits.
+ */
+static void
+Fax3PutBits(TIFF* tif, unsigned int bits, unsigned int length)
+{
+ Fax3CodecState* sp = EncoderState(tif);
+ unsigned int bit = sp->bit;
+ int data = sp->data;
+
+ _PutBits(tif, bits, length);
+
+ sp->data = data;
+ sp->bit = bit;
+}
+
+/*
+ * Write a code to the output stream.
+ */
+#define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length)
+
+#ifdef FAX3_DEBUG
+#define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B")
+#define DEBUG_PRINT(what,len) { \
+ int t; \
+ printf("%08X/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), len); \
+ for (t = length-1; t >= 0; t--) \
+ putchar(code & (1<<t) ? '1' : '0'); \
+ putchar('\n'); \
+}
+#endif
+
+/*
+ * Write the sequence of codes that describes
+ * the specified span of zero's or one's. The
+ * appropriate table that holds the make-up and
+ * terminating codes is supplied.
+ */
+static void
+putspan(TIFF* tif, int32 span, const tableentry* tab)
+{
+ Fax3CodecState* sp = EncoderState(tif);
+ unsigned int bit = sp->bit;
+ int data = sp->data;
+ unsigned int code, length;
+
+ while (span >= 2624) {
+ const tableentry* te = &tab[63 + (2560>>6)];
+ code = te->code, length = te->length;
+#ifdef FAX3_DEBUG
+ DEBUG_PRINT("MakeUp", te->runlen);
+#endif
+ _PutBits(tif, code, length);
+ span -= te->runlen;
+ }
+ if (span >= 64) {
+ const tableentry* te = &tab[63 + (span>>6)];
+ assert(te->runlen == 64*(span>>6));
+ code = te->code, length = te->length;
+#ifdef FAX3_DEBUG
+ DEBUG_PRINT("MakeUp", te->runlen);
+#endif
+ _PutBits(tif, code, length);
+ span -= te->runlen;
+ }
+ code = tab[span].code, length = tab[span].length;
+#ifdef FAX3_DEBUG
+ DEBUG_PRINT(" Term", tab[span].runlen);
+#endif
+ _PutBits(tif, code, length);
+
+ sp->data = data;
+ sp->bit = bit;
+}
+
+/*
+ * Write an EOL code to the output stream. The zero-fill
+ * logic for byte-aligning encoded scanlines is handled
+ * here. We also handle writing the tag bit for the next
+ * scanline when doing 2d encoding.
+ */
+static void
+Fax3PutEOL(TIFF* tif)
+{
+ Fax3CodecState* sp = EncoderState(tif);
+ unsigned int bit = sp->bit;
+ int data = sp->data;
+ unsigned int code, length, tparm;
+
+ if (sp->b.groupoptions & GROUP3OPT_FILLBITS) {
+ /*
+ * Force bit alignment so EOL will terminate on
+ * a byte boundary. That is, force the bit alignment
+ * to 16-12 = 4 before putting out the EOL code.
+ */
+ int align = 8 - 4;
+ if (align != sp->bit) {
+ if (align > sp->bit)
+ align = sp->bit + (8 - align);
+ else
+ align = sp->bit - align;
+ code = 0;
+ tparm=align;
+ _PutBits(tif, 0, tparm);
+ }
+ }
+ code = EOL, length = 12;
+ if (is2DEncoding(sp))
+ code = (code<<1) | (sp->tag == G3_1D), length++;
+ _PutBits(tif, code, length);
+
+ sp->data = data;
+ sp->bit = bit;
+}
+
+/*
+ * Reset encoding state at the start of a strip.
+ */
+static int
+Fax3PreEncode(TIFF* tif, tsample_t s)
+{
+ Fax3CodecState* sp = EncoderState(tif);
+
+ (void) s;
+ assert(sp != NULL);
+ sp->bit = 8;
+ sp->data = 0;
+ sp->tag = G3_1D;
+ /*
+ * This is necessary for Group 4; otherwise it isn't
+ * needed because the first scanline of each strip ends
+ * up being copied into the refline.
+ */
+ if (sp->refline)
+ _TIFFmemset(sp->refline, 0x00, sp->b.rowbytes);
+ if (is2DEncoding(sp)) {
+ float res = tif->tif_dir.td_yresolution;
+ /*
+ * The CCITT spec says that when doing 2d encoding, you
+ * should only do it on K consecutive scanlines, where K
+ * depends on the resolution of the image being encoded
+ * (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory
+ * code initializes td_yresolution to 0, this code will
+ * select a K of 2 unless the YResolution tag is set
+ * appropriately. (Note also that we fudge a little here
+ * and use 150 lpi to avoid problems with units conversion.)
+ */
+ if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER)
+ res *= 2.54f; /* convert to inches */
+ sp->maxk = (res > 150 ? 4 : 2);
+ sp->k = sp->maxk-1;
+ } else
+ sp->k = sp->maxk = 0;
+ return (1);
+}
+
+static const unsigned char zeroruns[256] = {
+ 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */
+};
+static const unsigned char oneruns[256] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */
+ 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */
+};
+
+/*
+ * On certain systems it pays to inline
+ * the routines that find pixel spans.
+ */
+#ifdef VAXC
+static int32 find0span(unsigned char*, int32, int32);
+static int32 find1span(unsigned char*, int32, int32);
+#pragma inline(find0span,find1span)
+#endif
+
+/*
+ * Find a span of ones or zeros using the supplied
+ * table. The ``base'' of the bit string is supplied
+ * along with the start+end bit indices.
+ */
+inline static int32
+find0span(unsigned char* bp, int32 bs, int32 be)
+{
+ int32 bits = be - bs;
+ int32 n, span;
+
+ bp += bs>>3;
+ /*
+ * Check partial byte on lhs.
+ */
+ if (bits > 0 && (n = (bs & 7))) {
+ span = zeroruns[(*bp << n) & 0xff];
+ if (span > 8-n) /* table value too generous */
+ span = 8-n;
+ if (span > bits) /* constrain span to bit range */
+ span = bits;
+ if (n+span < 8) /* doesn't extend to edge of byte */
+ return (span);
+ bits -= span;
+ bp++;
+ } else
+ span = 0;
+ if (bits >= 2*8*sizeof (long)) {
+ long* lp;
+ /*
+ * Align to longword boundary and check longwords.
+ */
+ while (!isAligned(bp, long)) {
+ if (*bp != 0x00)
+ return (span + zeroruns[*bp]);
+ span += 8, bits -= 8;
+ bp++;
+ }
+ lp = (long*) bp;
+ while (bits >= 8*sizeof (long) && *lp == 0) {
+ span += 8*sizeof (long), bits -= 8*sizeof (long);
+ lp++;
+ }
+ bp = (unsigned char*) lp;
+ }
+ /*
+ * Scan full bytes for all 0's.
+ */
+ while (bits >= 8) {
+ if (*bp != 0x00) /* end of run */
+ return (span + zeroruns[*bp]);
+ span += 8, bits -= 8;
+ bp++;
+ }
+ /*
+ * Check partial byte on rhs.
+ */
+ if (bits > 0) {
+ n = zeroruns[*bp];
+ span += (n > bits ? bits : n);
+ }
+ return (span);
+}
+
+inline static int32
+find1span(unsigned char* bp, int32 bs, int32 be)
+{
+ int32 bits = be - bs;
+ int32 n, span;
+
+ bp += bs>>3;
+ /*
+ * Check partial byte on lhs.
+ */
+ if (bits > 0 && (n = (bs & 7))) {
+ span = oneruns[(*bp << n) & 0xff];
+ if (span > 8-n) /* table value too generous */
+ span = 8-n;
+ if (span > bits) /* constrain span to bit range */
+ span = bits;
+ if (n+span < 8) /* doesn't extend to edge of byte */
+ return (span);
+ bits -= span;
+ bp++;
+ } else
+ span = 0;
+ if (bits >= 2*8*sizeof (long)) {
+ long* lp;
+ /*
+ * Align to longword boundary and check longwords.
+ */
+ while (!isAligned(bp, long)) {
+ if (*bp != 0xff)
+ return (span + oneruns[*bp]);
+ span += 8, bits -= 8;
+ bp++;
+ }
+ lp = (long*) bp;
+ while (bits >= 8*sizeof (long) && *lp == ~0) {
+ span += 8*sizeof (long), bits -= 8*sizeof (long);
+ lp++;
+ }
+ bp = (unsigned char*) lp;
+ }
+ /*
+ * Scan full bytes for all 1's.
+ */
+ while (bits >= 8) {
+ if (*bp != 0xff) /* end of run */
+ return (span + oneruns[*bp]);
+ span += 8, bits -= 8;
+ bp++;
+ }
+ /*
+ * Check partial byte on rhs.
+ */
+ if (bits > 0) {
+ n = oneruns[*bp];
+ span += (n > bits ? bits : n);
+ }
+ return (span);
+}
+
+/*
+ * Return the offset of the next bit in the range
+ * [bs..be] that is different from the specified
+ * color. The end, be, is returned if no such bit
+ * exists.
+ */
+#define finddiff(_cp, _bs, _be, _color) \
+ (_bs + (_color ? find1span(_cp,_bs,_be) : find0span(_cp,_bs,_be)))
+/*
+ * Like finddiff, but also check the starting bit
+ * against the end in case start > end.
+ */
+#define finddiff2(_cp, _bs, _be, _color) \
+ (_bs < _be ? finddiff(_cp,_bs,_be,_color) : _be)
+
+/*
+ * 1d-encode a row of pixels. The encoding is
+ * a sequence of all-white or all-black spans
+ * of pixels encoded with Huffman codes.
+ */
+static int
+Fax3Encode1DRow(TIFF* tif, unsigned char* bp, uint32 bits)
+{
+ Fax3CodecState* sp = EncoderState(tif);
+ int32 span;
+ uint32 bs = 0;
+
+ for (;;) {
+ span = find0span(bp, bs, bits); /* white span */
+ putspan(tif, span, TIFFFaxWhiteCodes);
+ bs += span;
+ if (bs >= bits)
+ break;
+ span = find1span(bp, bs, bits); /* black span */
+ putspan(tif, span, TIFFFaxBlackCodes);
+ bs += span;
+ if (bs >= bits)
+ break;
+ }
+ if (sp->b.mode & (FAXMODE_BYTEALIGN|FAXMODE_WORDALIGN)) {
+ if (sp->bit != 8) /* byte-align */
+ Fax3FlushBits(tif, sp);
+ if ((sp->b.mode&FAXMODE_WORDALIGN) &&
+ !isAligned(tif->tif_rawcp, uint16))
+ Fax3FlushBits(tif, sp);
+ }
+ return (1);
+}
+
+static const tableentry horizcode =
+ { 3, 0x1 }; /* 001 */
+static const tableentry passcode =
+ { 4, 0x1 }; /* 0001 */
+static const tableentry vcodes[7] = {
+ { 7, 0x03 }, /* 0000 011 */
+ { 6, 0x03 }, /* 0000 11 */
+ { 3, 0x03 }, /* 011 */
+ { 1, 0x1 }, /* 1 */
+ { 3, 0x2 }, /* 010 */
+ { 6, 0x02 }, /* 0000 10 */
+ { 7, 0x02 } /* 0000 010 */
+};
+
+/*
+ * 2d-encode a row of pixels. Consult the CCITT
+ * documentation for the algorithm.
+ */
+static int
+Fax3Encode2DRow(TIFF* tif, unsigned char* bp, unsigned char* rp, uint32 bits)
+{
+#define PIXEL(buf,ix) ((((buf)[(ix)>>3]) >> (7-((ix)&7))) & 1)
+ uint32 a0 = 0;
+ uint32 a1 = (PIXEL(bp, 0) != 0 ? 0 : finddiff(bp, 0, bits, 0));
+ uint32 b1 = (PIXEL(rp, 0) != 0 ? 0 : finddiff(rp, 0, bits, 0));
+ uint32 a2, b2;
+
+ for (;;) {
+ b2 = finddiff2(rp, b1, bits, PIXEL(rp,b1));
+ if (b2 >= a1) {
+ int32 d = b1 - a1;
+ if (!(-3 <= d && d <= 3)) { /* horizontal mode */
+ a2 = finddiff2(bp, a1, bits, PIXEL(bp,a1));
+ putcode(tif, &horizcode);
+ if (a0+a1 == 0 || PIXEL(bp, a0) == 0) {
+ putspan(tif, a1-a0, TIFFFaxWhiteCodes);
+ putspan(tif, a2-a1, TIFFFaxBlackCodes);
+ } else {
+ putspan(tif, a1-a0, TIFFFaxBlackCodes);
+ putspan(tif, a2-a1, TIFFFaxWhiteCodes);
+ }
+ a0 = a2;
+ } else { /* vertical mode */
+ putcode(tif, &vcodes[d+3]);
+ a0 = a1;
+ }
+ } else { /* pass mode */
+ putcode(tif, &passcode);
+ a0 = b2;
+ }
+ if (a0 >= bits)
+ break;
+ a1 = finddiff(bp, a0, bits, PIXEL(bp,a0));
+ b1 = finddiff(rp, a0, bits, !PIXEL(bp,a0));
+ b1 = finddiff(rp, b1, bits, PIXEL(bp,a0));
+ }
+ return (1);
+#undef PIXEL
+}
+
+/*
+ * Encode a buffer of pixels.
+ */
+static int
+Fax3Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
+{
+ Fax3CodecState* sp = EncoderState(tif);
+
+ (void) s;
+ while ((long)cc > 0) {
+ if ((sp->b.mode & FAXMODE_NOEOL) == 0)
+ Fax3PutEOL(tif);
+ if (is2DEncoding(sp)) {
+ if (sp->tag == G3_1D) {
+ if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
+ return (0);
+ sp->tag = G3_2D;
+ } else {
+ if (!Fax3Encode2DRow(tif, bp, sp->refline,
+ sp->b.rowpixels))
+ return (0);
+ sp->k--;
+ }
+ if (sp->k == 0) {
+ sp->tag = G3_1D;
+ sp->k = sp->maxk-1;
+ } else
+ _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
+ } else {
+ if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
+ return (0);
+ }
+ bp += sp->b.rowbytes;
+ cc -= sp->b.rowbytes;
+ }
+ return (1);
+}
+
+static int
+Fax3PostEncode(TIFF* tif)
+{
+ Fax3CodecState* sp = EncoderState(tif);
+
+ if (sp->bit != 8)
+ Fax3FlushBits(tif, sp);
+ return (1);
+}
+
+static void
+Fax3Close(TIFF* tif)
+{
+ if ((Fax3State(tif)->mode & FAXMODE_NORTC) == 0) {
+ Fax3CodecState* sp = EncoderState(tif);
+ unsigned int code = EOL;
+ unsigned int length = 12;
+ int i;
+
+ if (is2DEncoding(sp))
+ code = (code<<1) | (sp->tag == G3_1D), length++;
+ for (i = 0; i < 6; i++)
+ Fax3PutBits(tif, code, length);
+ Fax3FlushBits(tif, sp);
+ }
+}
+
+static void
+Fax3Cleanup(TIFF* tif)
+{
+ if (tif->tif_data) {
+ Fax3CodecState* sp = DecoderState(tif);
+
+ if (sp->runs)
+ _TIFFfree(sp->runs);
+ if (sp->refline)
+ _TIFFfree(sp->refline);
+
+ if (Fax3State(tif)->subaddress)
+ _TIFFfree(Fax3State(tif)->subaddress);
+ _TIFFfree(tif->tif_data);
+ tif->tif_data = NULL;
+ }
+}
+
+#define FIELD_BADFAXLINES (FIELD_CODEC+0)
+#define FIELD_CLEANFAXDATA (FIELD_CODEC+1)
+#define FIELD_BADFAXRUN (FIELD_CODEC+2)
+#define FIELD_RECVPARAMS (FIELD_CODEC+3)
+#define FIELD_SUBADDRESS (FIELD_CODEC+4)
+#define FIELD_RECVTIME (FIELD_CODEC+5)
+#define FIELD_FAXDCS (FIELD_CODEC+6)
+
+#define FIELD_OPTIONS (FIELD_CODEC+7)
+
+static const TIFFFieldInfo faxFieldInfo[] = {
+ { TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, FIELD_PSEUDO,
+ FALSE, FALSE, "FaxMode" },
+ { TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, FIELD_PSEUDO,
+ FALSE, FALSE, "FaxFillFunc" },
+ { TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, FIELD_BADFAXLINES,
+ TRUE, FALSE, "BadFaxLines" },
+ { TIFFTAG_BADFAXLINES, 1, 1, TIFF_SHORT, FIELD_BADFAXLINES,
+ TRUE, FALSE, "BadFaxLines" },
+ { TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, FIELD_CLEANFAXDATA,
+ TRUE, FALSE, "CleanFaxData" },
+ { TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_LONG, FIELD_BADFAXRUN,
+ TRUE, FALSE, "ConsecutiveBadFaxLines" },
+ { TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_SHORT, FIELD_BADFAXRUN,
+ TRUE, FALSE, "ConsecutiveBadFaxLines" },
+ { TIFFTAG_FAXRECVPARAMS, 1, 1, TIFF_LONG, FIELD_RECVPARAMS,
+ TRUE, FALSE, "FaxRecvParams" },
+ { TIFFTAG_FAXSUBADDRESS, -1,-1, TIFF_ASCII, FIELD_SUBADDRESS,
+ TRUE, FALSE, "FaxSubAddress" },
+ { TIFFTAG_FAXRECVTIME, 1, 1, TIFF_LONG, FIELD_RECVTIME,
+ TRUE, FALSE, "FaxRecvTime" },
+ { TIFFTAG_FAXDCS, -1,-1, TIFF_ASCII, FIELD_FAXDCS,
+ TRUE, FALSE, "FaxDcs" },
+};
+static const TIFFFieldInfo fax3FieldInfo[] = {
+ { TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS,
+ FALSE, FALSE, "Group3Options" },
+};
+static const TIFFFieldInfo fax4FieldInfo[] = {
+ { TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS,
+ FALSE, FALSE, "Group4Options" },
+};
+#define N(a) (sizeof (a) / sizeof (a[0]))
+
+static int
+Fax3VSetField(TIFF* tif, ttag_t tag, va_list ap)
+{
+ Fax3BaseState* sp = Fax3State(tif);
+
+ switch (tag) {
+ case TIFFTAG_FAXMODE:
+ sp->mode = va_arg(ap, int);
+ return (1); /* NB: pseudo tag */
+ case TIFFTAG_FAXFILLFUNC:
+ DecoderState(tif)->fill = va_arg(ap, TIFFFaxFillFunc);
+ return (1); /* NB: pseudo tag */
+ case TIFFTAG_GROUP3OPTIONS:
+ /* XXX: avoid reading options if compression mismatches. */
+ if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX3)
+ sp->groupoptions = va_arg(ap, uint32);
+ break;
+ case TIFFTAG_GROUP4OPTIONS:
+ /* XXX: avoid reading options if compression mismatches. */
+ if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4)
+ sp->groupoptions = va_arg(ap, uint32);
+ break;
+ case TIFFTAG_BADFAXLINES:
+ sp->badfaxlines = va_arg(ap, uint32);
+ break;
+ case TIFFTAG_CLEANFAXDATA:
+ sp->cleanfaxdata = (uint16) va_arg(ap, int);
+ break;
+ case TIFFTAG_CONSECUTIVEBADFAXLINES:
+ sp->badfaxrun = va_arg(ap, uint32);
+ break;
+ case TIFFTAG_FAXRECVPARAMS:
+ sp->recvparams = va_arg(ap, uint32);
+ break;
+ case TIFFTAG_FAXSUBADDRESS:
+ _TIFFsetString(&sp->subaddress, va_arg(ap, char*));
+ break;
+ case TIFFTAG_FAXRECVTIME:
+ sp->recvtime = va_arg(ap, uint32);
+ break;
+ case TIFFTAG_FAXDCS:
+ _TIFFsetString(&sp->faxdcs, va_arg(ap, char*));
+ break;
+ default:
+ return (*sp->vsetparent)(tif, tag, ap);
+ }
+ TIFFSetFieldBit(tif, _TIFFFieldWithTag(tif, tag)->field_bit);
+ tif->tif_flags |= TIFF_DIRTYDIRECT;
+ return (1);
+}
+
+static int
+Fax3VGetField(TIFF* tif, ttag_t tag, va_list ap)
+{
+ Fax3BaseState* sp = Fax3State(tif);
+
+ switch (tag) {
+ case TIFFTAG_FAXMODE:
+ *va_arg(ap, int*) = sp->mode;
+ break;
+ case TIFFTAG_FAXFILLFUNC:
+ *va_arg(ap, TIFFFaxFillFunc*) = DecoderState(tif)->fill;
+ break;
+ case TIFFTAG_GROUP3OPTIONS:
+ case TIFFTAG_GROUP4OPTIONS:
+ *va_arg(ap, uint32*) = sp->groupoptions;
+ break;
+ case TIFFTAG_BADFAXLINES:
+ *va_arg(ap, uint32*) = sp->badfaxlines;
+ break;
+ case TIFFTAG_CLEANFAXDATA:
+ *va_arg(ap, uint16*) = sp->cleanfaxdata;
+ break;
+ case TIFFTAG_CONSECUTIVEBADFAXLINES:
+ *va_arg(ap, uint32*) = sp->badfaxrun;
+ break;
+ case TIFFTAG_FAXRECVPARAMS:
+ *va_arg(ap, uint32*) = sp->recvparams;
+ break;
+ case TIFFTAG_FAXSUBADDRESS:
+ *va_arg(ap, char**) = sp->subaddress;
+ break;
+ case TIFFTAG_FAXRECVTIME:
+ *va_arg(ap, uint32*) = sp->recvtime;
+ break;
+ case TIFFTAG_FAXDCS:
+ *va_arg(ap, char**) = sp->faxdcs;
+ break;
+ default:
+ return (*sp->vgetparent)(tif, tag, ap);
+ }
+ return (1);
+}
+
+static void
+Fax3PrintDir(TIFF* tif, FILE* fd, long flags)
+{
+ Fax3BaseState* sp = Fax3State(tif);
+
+ (void) flags;
+ if (TIFFFieldSet(tif,FIELD_OPTIONS)) {
+ const char* sep = " ";
+ if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4) {
+ fprintf(fd, " Group 4 Options:");
+ if (sp->groupoptions & GROUP4OPT_UNCOMPRESSED)
+ fprintf(fd, "%suncompressed data", sep);
+ } else {
+
+ fprintf(fd, " Group 3 Options:");
+ if (sp->groupoptions & GROUP3OPT_2DENCODING)
+ fprintf(fd, "%s2-d encoding", sep), sep = "+";
+ if (sp->groupoptions & GROUP3OPT_FILLBITS)
+ fprintf(fd, "%sEOL padding", sep), sep = "+";
+ if (sp->groupoptions & GROUP3OPT_UNCOMPRESSED)
+ fprintf(fd, "%suncompressed data", sep);
+ }
+ fprintf(fd, " (%lu = 0x%lx)\n",
+ (unsigned long) sp->groupoptions,
+ (unsigned long) sp->groupoptions);
+ }
+ if (TIFFFieldSet(tif,FIELD_CLEANFAXDATA)) {
+ fprintf(fd, " Fax Data:");
+ switch (sp->cleanfaxdata) {
+ case CLEANFAXDATA_CLEAN:
+ fprintf(fd, " clean");
+ break;
+ case CLEANFAXDATA_REGENERATED:
+ fprintf(fd, " receiver regenerated");
+ break;
+ case CLEANFAXDATA_UNCLEAN:
+ fprintf(fd, " uncorrected errors");
+ break;
+ }
+ fprintf(fd, " (%u = 0x%x)\n",
+ sp->cleanfaxdata, sp->cleanfaxdata);
+ }
+ if (TIFFFieldSet(tif,FIELD_BADFAXLINES))
+ fprintf(fd, " Bad Fax Lines: %lu\n",
+ (unsigned long) sp->badfaxlines);
+ if (TIFFFieldSet(tif,FIELD_BADFAXRUN))
+ fprintf(fd, " Consecutive Bad Fax Lines: %lu\n",
+ (unsigned long) sp->badfaxrun);
+ if (TIFFFieldSet(tif,FIELD_RECVPARAMS))
+ fprintf(fd, " Fax Receive Parameters: %08lx\n",
+ (unsigned long) sp->recvparams);
+ if (TIFFFieldSet(tif,FIELD_SUBADDRESS))
+ fprintf(fd, " Fax SubAddress: %s\n", sp->subaddress);
+ if (TIFFFieldSet(tif,FIELD_RECVTIME))
+ fprintf(fd, " Fax Receive Time: %lu secs\n",
+ (unsigned long) sp->recvtime);
+ if (TIFFFieldSet(tif,FIELD_FAXDCS))
+ fprintf(fd, " Fax DCS: %s\n", sp->faxdcs);
+}
+
+static int
+InitCCITTFax3(TIFF* tif)
+{
+ Fax3BaseState* sp;
+
+ /*
+ * Allocate state block so tag methods have storage to record values.
+ */
+ tif->tif_data = (tidata_t)
+ _TIFFmalloc(sizeof (Fax3CodecState));
+
+ if (tif->tif_data == NULL) {
+ TIFFError("TIFFInitCCITTFax3",
+ "%s: No space for state block", tif->tif_name);
+ return (0);
+ }
+
+ sp = Fax3State(tif);
+ sp->rw_mode = tif->tif_mode;
+
+ /*
+ * Merge codec-specific tag information and
+ * override parent get/set field methods.
+ */
+ _TIFFMergeFieldInfo(tif, faxFieldInfo, N(faxFieldInfo));
+ sp->vgetparent = tif->tif_tagmethods.vgetfield;
+ tif->tif_tagmethods.vgetfield = Fax3VGetField; /* hook for codec tags */
+ sp->vsetparent = tif->tif_tagmethods.vsetfield;
+ tif->tif_tagmethods.vsetfield = Fax3VSetField; /* hook for codec tags */
+ tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */
+ sp->groupoptions = 0;
+ sp->recvparams = 0;
+ sp->subaddress = NULL;
+ sp->faxdcs = NULL;
+
+ if (sp->rw_mode == O_RDONLY) /* FIXME: improve for in place update */
+ tif->tif_flags |= TIFF_NOBITREV; /* decoder does bit reversal */
+ DecoderState(tif)->runs = NULL;
+ TIFFSetField(tif, TIFFTAG_FAXFILLFUNC, _TIFFFax3fillruns);
+ EncoderState(tif)->refline = NULL;
+
+ /*
+ * Install codec methods.
+ */
+ tif->tif_setupdecode = Fax3SetupState;
+ tif->tif_predecode = Fax3PreDecode;
+ tif->tif_decoderow = Fax3Decode1D;
+ tif->tif_decodestrip = Fax3Decode1D;
+ tif->tif_decodetile = Fax3Decode1D;
+ tif->tif_setupencode = Fax3SetupState;
+ tif->tif_preencode = Fax3PreEncode;
+ tif->tif_postencode = Fax3PostEncode;
+ tif->tif_encoderow = Fax3Encode;
+ tif->tif_encodestrip = Fax3Encode;
+ tif->tif_encodetile = Fax3Encode;
+ tif->tif_close = Fax3Close;
+ tif->tif_cleanup = Fax3Cleanup;
+
+ return (1);
+}
+
+int
+TIFFInitCCITTFax3(TIFF* tif, int scheme)
+{
+ if (InitCCITTFax3(tif)) {
+ _TIFFMergeFieldInfo(tif, fax3FieldInfo, N(fax3FieldInfo));
+
+ /*
+ * The default format is Class/F-style w/o RTC.
+ */
+ return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF);
+ } else
+ return (0);
+}
+
+/*
+ * CCITT Group 4 (T.6) Facsimile-compatible
+ * Compression Scheme Support.
+ */
+
+#define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
+/*
+ * Decode the requested amount of G4-encoded data.
+ */
+static int
+Fax4Decode(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
+{
+ DECLARE_STATE_2D(tif, sp, "Fax4Decode");
+
+ (void) s;
+ CACHE_STATE(tif, sp);
+ while ((long)occ > 0) {
+ a0 = 0;
+ RunLength = 0;
+ pa = thisrun = sp->curruns;
+ pb = sp->refruns;
+ b1 = *pb++;
+#ifdef FAX3_DEBUG
+ printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
+ printf("-------------------- %d\n", tif->tif_row);
+ fflush(stdout);
+#endif
+ EXPAND2D(EOFG4);
+ if (EOLcnt)
+ goto EOFG4;
+ (*sp->fill)(buf, thisrun, pa, lastx);
+ SETVAL(0); /* imaginary change for reference */
+ SWAP(uint32*, sp->curruns, sp->refruns);
+ buf += sp->b.rowbytes;
+ occ -= sp->b.rowbytes;
+ continue;
+ EOFG4:
+ NeedBits16( 13, BADG4 );
+ BADG4:
+#ifdef FAX3_DEBUG
+ if( GetBits(13) != 0x1001 )
+ fputs( "Bad RTC\n", stderr );
+#endif
+ ClrBits( 13 );
+ (*sp->fill)(buf, thisrun, pa, lastx);
+ UNCACHE_STATE(tif, sp);
+ return (-1);
+ }
+ UNCACHE_STATE(tif, sp);
+ return (1);
+}
+#undef SWAP
+
+/*
+ * Encode the requested amount of data.
+ */
+static int
+Fax4Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
+{
+ Fax3CodecState *sp = EncoderState(tif);
+
+ (void) s;
+ while ((long)cc > 0) {
+ if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels))
+ return (0);
+ _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
+ bp += sp->b.rowbytes;
+ cc -= sp->b.rowbytes;
+ }
+ return (1);
+}
+
+static int
+Fax4PostEncode(TIFF* tif)
+{
+ Fax3CodecState *sp = EncoderState(tif);
+
+ /* terminate strip w/ EOFB */
+ Fax3PutBits(tif, EOL, 12);
+ Fax3PutBits(tif, EOL, 12);
+ if (sp->bit != 8)
+ Fax3FlushBits(tif, sp);
+ return (1);
+}
+
+int
+TIFFInitCCITTFax4(TIFF* tif, int scheme)
+{
+ if (InitCCITTFax3(tif)) { /* reuse G3 support */
+ _TIFFMergeFieldInfo(tif, fax4FieldInfo, N(fax4FieldInfo));
+
+ tif->tif_decoderow = Fax4Decode;
+ tif->tif_decodestrip = Fax4Decode;
+ tif->tif_decodetile = Fax4Decode;
+ tif->tif_encoderow = Fax4Encode;
+ tif->tif_encodestrip = Fax4Encode;
+ tif->tif_encodetile = Fax4Encode;
+ tif->tif_postencode = Fax4PostEncode;
+ /*
+ * Suppress RTC at the end of each strip.
+ */
+ return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC);
+ } else
+ return (0);
+}
+
+/*
+ * CCITT Group 3 1-D Modified Huffman RLE Compression Support.
+ * (Compression algorithms 2 and 32771)
+ */
+
+/*
+ * Decode the requested amount of RLE-encoded data.
+ */
+static int
+Fax3DecodeRLE(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
+{
+ DECLARE_STATE(tif, sp, "Fax3DecodeRLE");
+ int mode = sp->b.mode;
+
+ (void) s;
+ CACHE_STATE(tif, sp);
+ thisrun = sp->curruns;
+ while ((long)occ > 0) {
+ a0 = 0;
+ RunLength = 0;
+ pa = thisrun;
+#ifdef FAX3_DEBUG
+ printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
+ printf("-------------------- %d\n", tif->tif_row);
+ fflush(stdout);
+#endif
+ EXPAND1D(EOFRLE);
+ (*sp->fill)(buf, thisrun, pa, lastx);
+ /*
+ * Cleanup at the end of the row.
+ */
+ if (mode & FAXMODE_BYTEALIGN) {
+ int n = BitsAvail - (BitsAvail &~ 7);
+ ClrBits(n);
+ } else if (mode & FAXMODE_WORDALIGN) {
+ int n = BitsAvail - (BitsAvail &~ 15);
+ ClrBits(n);
+ if (BitsAvail == 0 && !isAligned(cp, uint16))
+ cp++;
+ }
+ buf += sp->b.rowbytes;
+ occ -= sp->b.rowbytes;
+ continue;
+ EOFRLE: /* premature EOF */
+ (*sp->fill)(buf, thisrun, pa, lastx);
+ UNCACHE_STATE(tif, sp);
+ return (-1);
+ }
+ UNCACHE_STATE(tif, sp);
+ return (1);
+}
+
+int
+TIFFInitCCITTRLE(TIFF* tif, int scheme)
+{
+ if (InitCCITTFax3(tif)) { /* reuse G3 support */
+ tif->tif_decoderow = Fax3DecodeRLE;
+ tif->tif_decodestrip = Fax3DecodeRLE;
+ tif->tif_decodetile = Fax3DecodeRLE;
+ /*
+ * Suppress RTC+EOLs when encoding and byte-align data.
+ */
+ return TIFFSetField(tif, TIFFTAG_FAXMODE,
+ FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_BYTEALIGN);
+ } else
+ return (0);
+}
+
+int
+TIFFInitCCITTRLEW(TIFF* tif, int scheme)
+{
+ if (InitCCITTFax3(tif)) { /* reuse G3 support */
+ tif->tif_decoderow = Fax3DecodeRLE;
+ tif->tif_decodestrip = Fax3DecodeRLE;
+ tif->tif_decodetile = Fax3DecodeRLE;
+ /*
+ * Suppress RTC+EOLs when encoding and word-align data.
+ */
+ return TIFFSetField(tif, TIFFTAG_FAXMODE,
+ FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_WORDALIGN);
+ } else
+ return (0);
+}
+#endif /* CCITT_SUPPORT */
+
+/* vim: set ts=8 sts=8 sw=8 noet: */
projects / opencv / blobdiff