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/* $Id: tif_fax3.c,v 1.16 2006/10/28 19:36:43 drolon Exp $ */
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* Copyright (c) 1990-1997 Sam Leffler
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* Copyright (c) 1991-1997 Silicon Graphics, Inc.
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* CCITT Group 3 (T.4) and Group 4 (T.6) Compression Support.
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* This file contains support for decoding and encoding TIFF
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* compression algorithms 2, 3, 4, and 32771.
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* Decoder support is derived, with permission, from the code
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* in Frank Cringle's viewfax program;
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* Copyright (C) 1990, 1995 Frank D. Cringle.
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* Compression+decompression state blocks are
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* derived from this ``base state'' block.
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int rw_mode; /* O_RDONLY for decode, else encode */
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int mode; /* operating mode */
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uint32 rowbytes; /* bytes in a decoded scanline */
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uint32 rowpixels; /* pixels in a scanline */
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uint16 cleanfaxdata; /* CleanFaxData tag */
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uint32 badfaxrun; /* BadFaxRun tag */
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uint32 badfaxlines; /* BadFaxLines tag */
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uint32 groupoptions; /* Group 3/4 options tag */
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uint32 recvparams; /* encoded Class 2 session params */
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char* subaddress; /* subaddress string */
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uint32 recvtime; /* time spent receiving (secs) */
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char* faxdcs; /* Table 2/T.30 encoded session params */
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TIFFVGetMethod vgetparent; /* super-class method */
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TIFFVSetMethod vsetparent; /* super-class method */
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TIFFPrintMethod printdir; /* super-class method */
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#define Fax3State(tif) ((Fax3BaseState*) (tif)->tif_data)
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typedef enum { G3_1D, G3_2D } Ttag;
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/* Decoder state info */
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const unsigned char* bitmap; /* bit reversal table */
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uint32 data; /* current i/o byte/word */
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int bit; /* current i/o bit in byte */
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int EOLcnt; /* count of EOL codes recognized */
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TIFFFaxFillFunc fill; /* fill routine */
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uint32* runs; /* b&w runs for current/previous row */
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uint32* refruns; /* runs for reference line */
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uint32* curruns; /* runs for current line */
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/* Encoder state info */
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Ttag tag; /* encoding state */
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unsigned char* refline; /* reference line for 2d decoding */
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int k; /* #rows left that can be 2d encoded */
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int maxk; /* max #rows that can be 2d encoded */
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#define DecoderState(tif) ((Fax3CodecState*) Fax3State(tif))
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#define EncoderState(tif) ((Fax3CodecState*) Fax3State(tif))
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#define is2DEncoding(sp) \
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(sp->b.groupoptions & GROUP3OPT_2DENCODING)
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#define isAligned(p,t) ((((unsigned long)(p)) & (sizeof (t)-1)) == 0)
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* Group 3 and Group 4 Decoding.
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* These macros glue the TIFF library state to
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* the state expected by Frank's decoder.
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#define DECLARE_STATE(tif, sp, mod) \
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static const char module[] = mod; \
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Fax3CodecState* sp = DecoderState(tif); \
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int a0; /* reference element */ \
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int lastx = sp->b.rowpixels; /* last element in row */ \
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uint32 BitAcc; /* bit accumulator */ \
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int BitsAvail; /* # valid bits in BitAcc */ \
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int RunLength; /* length of current run */ \
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unsigned char* cp; /* next byte of input data */ \
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unsigned char* ep; /* end of input data */ \
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uint32* pa; /* place to stuff next run */ \
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uint32* thisrun; /* current row's run array */ \
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int EOLcnt; /* # EOL codes recognized */ \
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const unsigned char* bitmap = sp->bitmap; /* input data bit reverser */ \
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const TIFFFaxTabEnt* TabEnt
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#define DECLARE_STATE_2D(tif, sp, mod) \
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DECLARE_STATE(tif, sp, mod); \
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int b1; /* next change on prev line */ \
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uint32* pb /* next run in reference line */\
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* Load any state that may be changed during decoding.
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#define CACHE_STATE(tif, sp) do { \
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BitsAvail = sp->bit; \
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EOLcnt = sp->EOLcnt; \
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cp = (unsigned char*) tif->tif_rawcp; \
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ep = cp + tif->tif_rawcc; \
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* Save state possibly changed during decoding.
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#define UNCACHE_STATE(tif, sp) do { \
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sp->bit = BitsAvail; \
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sp->EOLcnt = EOLcnt; \
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tif->tif_rawcc -= (tidata_t) cp - tif->tif_rawcp; \
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tif->tif_rawcp = (tidata_t) cp; \
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* Setup state for decoding a strip.
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Fax3PreDecode(TIFF* tif, tsample_t s)
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Fax3CodecState* sp = DecoderState(tif);
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sp->bit = 0; /* force initial read */
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sp->EOLcnt = 0; /* force initial scan for EOL */
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* Decoder assumes lsb-to-msb bit order. Note that we select
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* this here rather than in Fax3SetupState so that viewers can
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* hold the image open, fiddle with the FillOrder tag value,
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* and then re-decode the image. Otherwise they'd need to close
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* and open the image to get the state reset.
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TIFFGetBitRevTable(tif->tif_dir.td_fillorder != FILLORDER_LSB2MSB);
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if (sp->refruns) { /* init reference line to white */
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sp->refruns[0] = (uint32) sp->b.rowpixels;
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* Routine for handling various errors/conditions.
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* Note how they are "glued into the decoder" by
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* overriding the definitions used by the decoder.
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Fax3Unexpected(const char* module, TIFF* tif, uint32 line, uint32 a0)
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TIFFErrorExt(tif->tif_clientdata, module, "%s: Bad code word at line %lu of %s %lu (x %lu)",
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tif->tif_name, (unsigned long) line, isTiled(tif) ? "tile" : "strip",
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(unsigned long) (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
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#define unexpected(table, a0) Fax3Unexpected(module, tif, sp->line, a0)
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Fax3Extension(const char* module, TIFF* tif, uint32 line, uint32 a0)
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TIFFErrorExt(tif->tif_clientdata, module,
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"%s: Uncompressed data (not supported) at line %lu of %s %lu (x %lu)",
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tif->tif_name, (unsigned long) line, isTiled(tif) ? "tile" : "strip",
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(unsigned long) (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
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#define extension(a0) Fax3Extension(module, tif, sp->line, a0)
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Fax3BadLength(const char* module, TIFF* tif, uint32 line, uint32 a0, uint32 lastx)
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TIFFWarningExt(tif->tif_clientdata, module, "%s: %s at line %lu of %s %lu (got %lu, expected %lu)",
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a0 < lastx ? "Premature EOL" : "Line length mismatch",
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(unsigned long) line, isTiled(tif) ? "tile" : "strip",
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(unsigned long) (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
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(unsigned long) a0, lastx);
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#define badlength(a0,lastx) Fax3BadLength(module, tif, sp->line, a0, lastx)
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Fax3PrematureEOF(const char* module, TIFF* tif, uint32 line, uint32 a0)
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TIFFWarningExt(tif->tif_clientdata, module, "%s: Premature EOF at line %lu of %s %lu (x %lu)",
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(unsigned long) line, isTiled(tif) ? "tile" : "strip",
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(unsigned long) (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
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#define prematureEOF(a0) Fax3PrematureEOF(module, tif, sp->line, a0)
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* Decode the requested amount of G3 1D-encoded data.
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Fax3Decode1D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
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DECLARE_STATE(tif, sp, "Fax3Decode1D");
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CACHE_STATE(tif, sp);
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thisrun = sp->curruns;
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while ((long)occ > 0) {
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printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
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printf("-------------------- %d\n", tif->tif_row);
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(*sp->fill)(buf, thisrun, pa, lastx);
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buf += sp->b.rowbytes;
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occ -= sp->b.rowbytes;
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EOF1D: /* premature EOF */
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EOF1Da: /* premature EOF */
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(*sp->fill)(buf, thisrun, pa, lastx);
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UNCACHE_STATE(tif, sp);
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UNCACHE_STATE(tif, sp);
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#define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
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* Decode the requested amount of G3 2D-encoded data.
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Fax3Decode2D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
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DECLARE_STATE_2D(tif, sp, "Fax3Decode2D");
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int is1D; /* current line is 1d/2d-encoded */
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CACHE_STATE(tif, sp);
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while ((long)occ > 0) {
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pa = thisrun = sp->curruns;
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printf("\nBitAcc=%08X, BitsAvail = %d EOLcnt = %d",
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BitAcc, BitsAvail, EOLcnt);
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is1D = GetBits(1); /* 1D/2D-encoding tag bit */
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printf(" %s\n-------------------- %d\n",
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is1D ? "1D" : "2D", tif->tif_row);
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(*sp->fill)(buf, thisrun, pa, lastx);
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SETVALUE(0); /* imaginary change for reference */
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SWAP(uint32*, sp->curruns, sp->refruns);
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buf += sp->b.rowbytes;
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occ -= sp->b.rowbytes;
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EOF2D: /* premature EOF */
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EOF2Da: /* premature EOF */
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(*sp->fill)(buf, thisrun, pa, lastx);
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UNCACHE_STATE(tif, sp);
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UNCACHE_STATE(tif, sp);
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* The ZERO & FILL macros must handle spans < 2*sizeof(long) bytes.
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* For machines with 64-bit longs this is <16 bytes; otherwise
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* this is <8 bytes. We optimize the code here to reflect the
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* machine characteristics.
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# define FILL(n, cp) \
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case 15:(cp)[14] = 0xff; case 14:(cp)[13] = 0xff; case 13: (cp)[12] = 0xff;\
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case 12:(cp)[11] = 0xff; case 11:(cp)[10] = 0xff; case 10: (cp)[9] = 0xff;\
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case 9: (cp)[8] = 0xff; case 8: (cp)[7] = 0xff; case 7: (cp)[6] = 0xff;\
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case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; case 4: (cp)[3] = 0xff;\
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case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \
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case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \
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# define ZERO(n, cp) \
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case 15:(cp)[14] = 0; case 14:(cp)[13] = 0; case 13: (cp)[12] = 0; \
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case 12:(cp)[11] = 0; case 11:(cp)[10] = 0; case 10: (cp)[9] = 0; \
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case 9: (cp)[8] = 0; case 8: (cp)[7] = 0; case 7: (cp)[6] = 0; \
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case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; case 4: (cp)[3] = 0; \
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case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \
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case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \
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# define FILL(n, cp) \
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case 7: (cp)[6] = 0xff; case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; \
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case 4: (cp)[3] = 0xff; case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \
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case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \
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# define ZERO(n, cp) \
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case 7: (cp)[6] = 0; case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; \
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case 4: (cp)[3] = 0; case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \
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case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \
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* Bit-fill a row according to the white/black
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* runs generated during G3/G4 decoding.
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_TIFFFax3fillruns(unsigned char* buf, uint32* runs, uint32* erun, uint32 lastx)
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static const unsigned char _fillmasks[] =
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{ 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
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for (; runs < erun; runs += 2) {
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if (x+run > lastx || run > lastx )
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run = runs[0] = (uint32) (lastx - x);
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if (bx) { /* align to byte boundary */
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*cp++ &= 0xff << (8-bx);
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if( (n = run >> 3) != 0 ) { /* multiple bytes to fill */
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if ((n/sizeof (long)) > 1) {
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* Align to longword boundary and fill.
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for (; n && !isAligned(cp, long); n--)
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nw = (int32)(n / sizeof (long));
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n -= nw * sizeof (long);
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cp = (unsigned char*) lp;
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cp[0] &= 0xff >> run;
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cp[0] &= ~(_fillmasks[run]>>bx);
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if (x+run > lastx || run > lastx )
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run = runs[1] = lastx - x;
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if (bx) { /* align to byte boundary */
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if( (n = run>>3) != 0 ) { /* multiple bytes to fill */
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if ((n/sizeof (long)) > 1) {
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* Align to longword boundary and fill.
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for (; n && !isAligned(cp, long); n--)
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nw = (int32)(n / sizeof (long));
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n -= nw * sizeof (long);
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cp = (unsigned char*) lp;
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cp[0] |= 0xff00 >> run;
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cp[0] |= _fillmasks[run]>>bx;
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* Setup G3/G4-related compression/decompression state
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* before data is processed. This routine is called once
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* per image -- it sets up different state based on whether
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* or not decoding or encoding is being done and whether
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* 1D- or 2D-encoded data is involved.
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Fax3SetupState(TIFF* tif)
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TIFFDirectory* td = &tif->tif_dir;
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Fax3BaseState* sp = Fax3State(tif);
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Fax3CodecState* dsp = (Fax3CodecState*) Fax3State(tif);
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uint32 rowbytes, rowpixels, nruns;
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if (td->td_bitspersample != 1) {
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TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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"Bits/sample must be 1 for Group 3/4 encoding/decoding");
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* Calculate the scanline/tile widths.
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rowbytes = TIFFTileRowSize(tif);
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rowpixels = td->td_tilewidth;
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rowbytes = TIFFScanlineSize(tif);
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rowpixels = td->td_imagewidth;
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sp->rowbytes = (uint32) rowbytes;
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sp->rowpixels = (uint32) rowpixels;
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* Allocate any additional space required for decoding/encoding.
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(sp->groupoptions & GROUP3OPT_2DENCODING) ||
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td->td_compression == COMPRESSION_CCITTFAX4
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nruns = needsRefLine ? 2*TIFFroundup(rowpixels,32) : rowpixels;
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dsp->runs = (uint32*) _TIFFCheckMalloc(tif, 2*nruns, sizeof (uint32),
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"for Group 3/4 run arrays");
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if (dsp->runs == NULL)
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dsp->curruns = dsp->runs;
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dsp->refruns = dsp->runs + nruns;
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if (td->td_compression == COMPRESSION_CCITTFAX3
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&& is2DEncoding(dsp)) { /* NB: default is 1D routine */
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tif->tif_decoderow = Fax3Decode2D;
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tif->tif_decodestrip = Fax3Decode2D;
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tif->tif_decodetile = Fax3Decode2D;
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if (needsRefLine) { /* 2d encoding */
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Fax3CodecState* esp = EncoderState(tif);
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* 2d encoding requires a scanline
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* buffer for the ``reference line''; the
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* scanline against which delta encoding
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* is referenced. The reference line must
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* be initialized to be ``white'' (done elsewhere).
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esp->refline = (unsigned char*) _TIFFmalloc(rowbytes);
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if (esp->refline == NULL) {
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TIFFErrorExt(tif->tif_clientdata, "Fax3SetupState",
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"%s: No space for Group 3/4 reference line",
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} else /* 1d encoding */
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EncoderState(tif)->refline = NULL;
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* CCITT Group 3 FAX Encoding.
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#define Fax3FlushBits(tif, sp) { \
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if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
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(void) TIFFFlushData1(tif); \
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*(tif)->tif_rawcp++ = (tidataval_t) (sp)->data; \
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(tif)->tif_rawcc++; \
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(sp)->data = 0, (sp)->bit = 8; \
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#define _FlushBits(tif) { \
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if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
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(void) TIFFFlushData1(tif); \
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*(tif)->tif_rawcp++ = (tidataval_t) data; \
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(tif)->tif_rawcc++; \
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static const int _msbmask[9] =
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{ 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff };
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#define _PutBits(tif, bits, length) { \
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while (length > bit) { \
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data |= bits >> (length - bit); \
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data |= (bits & _msbmask[length]) << (bit - length); \
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* Write a variable-length bit-value to
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* the output stream. Values are
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* assumed to be at most 16 bits.
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Fax3PutBits(TIFF* tif, unsigned int bits, unsigned int length)
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Fax3CodecState* sp = EncoderState(tif);
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unsigned int bit = sp->bit;
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_PutBits(tif, bits, length);
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* Write a code to the output stream.
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#define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length)
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#define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B")
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#define DEBUG_PRINT(what,len) { \
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printf("%08X/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), len); \
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for (t = length-1; t >= 0; t--) \
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putchar(code & (1<<t) ? '1' : '0'); \
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* Write the sequence of codes that describes
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* the specified span of zero's or one's. The
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* appropriate table that holds the make-up and
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* terminating codes is supplied.
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putspan(TIFF* tif, int32 span, const tableentry* tab)
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Fax3CodecState* sp = EncoderState(tif);
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unsigned int bit = sp->bit;
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unsigned int code, length;
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while (span >= 2624) {
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const tableentry* te = &tab[63 + (2560>>6)];
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code = te->code, length = te->length;
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DEBUG_PRINT("MakeUp", te->runlen);
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_PutBits(tif, code, length);
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const tableentry* te = &tab[63 + (span>>6)];
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assert(te->runlen == 64*(span>>6));
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code = te->code, length = te->length;
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DEBUG_PRINT("MakeUp", te->runlen);
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_PutBits(tif, code, length);
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code = tab[span].code, length = tab[span].length;
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DEBUG_PRINT(" Term", tab[span].runlen);
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_PutBits(tif, code, length);
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* Write an EOL code to the output stream. The zero-fill
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* logic for byte-aligning encoded scanlines is handled
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* here. We also handle writing the tag bit for the next
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* scanline when doing 2d encoding.
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Fax3PutEOL(TIFF* tif)
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Fax3CodecState* sp = EncoderState(tif);
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unsigned int bit = sp->bit;
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unsigned int code, length, tparm;
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if (sp->b.groupoptions & GROUP3OPT_FILLBITS) {
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* Force bit alignment so EOL will terminate on
662
* a byte boundary. That is, force the bit alignment
663
* to 16-12 = 4 before putting out the EOL code.
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if (align != sp->bit) {
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align = sp->bit + (8 - align);
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align = sp->bit - align;
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_PutBits(tif, 0, tparm);
676
code = EOL, length = 12;
677
if (is2DEncoding(sp))
678
code = (code<<1) | (sp->tag == G3_1D), length++;
679
_PutBits(tif, code, length);
686
* Reset encoding state at the start of a strip.
689
Fax3PreEncode(TIFF* tif, tsample_t s)
691
Fax3CodecState* sp = EncoderState(tif);
699
* This is necessary for Group 4; otherwise it isn't
700
* needed because the first scanline of each strip ends
701
* up being copied into the refline.
704
_TIFFmemset(sp->refline, 0x00, sp->b.rowbytes);
705
if (is2DEncoding(sp)) {
706
float res = tif->tif_dir.td_yresolution;
708
* The CCITT spec says that when doing 2d encoding, you
709
* should only do it on K consecutive scanlines, where K
710
* depends on the resolution of the image being encoded
711
* (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory
712
* code initializes td_yresolution to 0, this code will
713
* select a K of 2 unless the YResolution tag is set
714
* appropriately. (Note also that we fudge a little here
715
* and use 150 lpi to avoid problems with units conversion.)
717
if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER)
718
res *= 2.54f; /* convert to inches */
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sp->maxk = (res > 150 ? 4 : 2);
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sp->k = sp->maxk = 0;
727
static const unsigned char zeroruns[256] = {
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8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */
736
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */
737
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */
738
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */
739
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */
740
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */
741
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */
742
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */
743
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */
745
static const unsigned char oneruns[256] = {
746
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */
747
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */
748
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */
749
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */
750
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */
751
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */
752
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */
753
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */
754
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */
755
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */
756
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */
757
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */
758
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */
759
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */
760
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */
761
4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */
765
* On certain systems it pays to inline
766
* the routines that find pixel spans.
769
static int32 find0span(unsigned char*, int32, int32);
770
static int32 find1span(unsigned char*, int32, int32);
771
#pragma inline(find0span,find1span)
775
* Find a span of ones or zeros using the supplied
776
* table. The ``base'' of the bit string is supplied
777
* along with the start+end bit indices.
780
find0span(unsigned char* bp, int32 bs, int32 be)
782
int32 bits = be - bs;
787
* Check partial byte on lhs.
789
if (bits > 0 && (n = (bs & 7))) {
790
span = zeroruns[(*bp << n) & 0xff];
791
if (span > 8-n) /* table value too generous */
793
if (span > bits) /* constrain span to bit range */
795
if (n+span < 8) /* doesn't extend to edge of byte */
801
if (bits >= (int32)(2 * 8 * sizeof(long))) {
804
* Align to longword boundary and check longwords.
806
while (!isAligned(bp, long)) {
808
return (span + zeroruns[*bp]);
809
span += 8, bits -= 8;
813
while ((bits >= (int32)(8 * sizeof(long))) && (0 == *lp)) {
814
span += 8*sizeof (long), bits -= 8*sizeof (long);
817
bp = (unsigned char*) lp;
820
* Scan full bytes for all 0's.
823
if (*bp != 0x00) /* end of run */
824
return (span + zeroruns[*bp]);
825
span += 8, bits -= 8;
829
* Check partial byte on rhs.
833
span += (n > bits ? bits : n);
839
find1span(unsigned char* bp, int32 bs, int32 be)
841
int32 bits = be - bs;
846
* Check partial byte on lhs.
848
if (bits > 0 && (n = (bs & 7))) {
849
span = oneruns[(*bp << n) & 0xff];
850
if (span > 8-n) /* table value too generous */
852
if (span > bits) /* constrain span to bit range */
854
if (n+span < 8) /* doesn't extend to edge of byte */
860
if (bits >= (int32)(2 * 8 * sizeof(long))) {
863
* Align to longword boundary and check longwords.
865
while (!isAligned(bp, long)) {
867
return (span + oneruns[*bp]);
868
span += 8, bits -= 8;
872
while ((bits >= (int32)(8 * sizeof(long))) && (~0 == *lp)) {
873
span += 8*sizeof (long), bits -= 8*sizeof (long);
876
bp = (unsigned char*) lp;
879
* Scan full bytes for all 1's.
882
if (*bp != 0xff) /* end of run */
883
return (span + oneruns[*bp]);
884
span += 8, bits -= 8;
888
* Check partial byte on rhs.
892
span += (n > bits ? bits : n);
898
* Return the offset of the next bit in the range
899
* [bs..be] that is different from the specified
900
* color. The end, be, is returned if no such bit
903
#define finddiff(_cp, _bs, _be, _color) \
904
(_bs + (_color ? find1span(_cp,_bs,_be) : find0span(_cp,_bs,_be)))
906
* Like finddiff, but also check the starting bit
907
* against the end in case start > end.
909
#define finddiff2(_cp, _bs, _be, _color) \
910
(_bs < _be ? finddiff(_cp,_bs,_be,_color) : _be)
913
* 1d-encode a row of pixels. The encoding is
914
* a sequence of all-white or all-black spans
915
* of pixels encoded with Huffman codes.
918
Fax3Encode1DRow(TIFF* tif, unsigned char* bp, uint32 bits)
920
Fax3CodecState* sp = EncoderState(tif);
925
span = find0span(bp, bs, bits); /* white span */
926
putspan(tif, span, TIFFFaxWhiteCodes);
930
span = find1span(bp, bs, bits); /* black span */
931
putspan(tif, span, TIFFFaxBlackCodes);
936
if (sp->b.mode & (FAXMODE_BYTEALIGN|FAXMODE_WORDALIGN)) {
937
if (sp->bit != 8) /* byte-align */
938
Fax3FlushBits(tif, sp);
939
if ((sp->b.mode&FAXMODE_WORDALIGN) &&
940
!isAligned(tif->tif_rawcp, uint16))
941
Fax3FlushBits(tif, sp);
946
static const tableentry horizcode =
947
{ 3, 0x1, 0 }; /* 001 */
948
static const tableentry passcode =
949
{ 4, 0x1, 0 }; /* 0001 */
950
static const tableentry vcodes[7] = {
951
{ 7, 0x03, 0 }, /* 0000 011 */
952
{ 6, 0x03, 0 }, /* 0000 11 */
953
{ 3, 0x03, 0 }, /* 011 */
954
{ 1, 0x1, 0 }, /* 1 */
955
{ 3, 0x2, 0 }, /* 010 */
956
{ 6, 0x02, 0 }, /* 0000 10 */
957
{ 7, 0x02, 0 } /* 0000 010 */
961
* 2d-encode a row of pixels. Consult the CCITT
962
* documentation for the algorithm.
965
Fax3Encode2DRow(TIFF* tif, unsigned char* bp, unsigned char* rp, uint32 bits)
967
#define PIXEL(buf,ix) ((((buf)[(ix)>>3]) >> (7-((ix)&7))) & 1)
969
uint32 a1 = (PIXEL(bp, 0) != 0 ? 0 : finddiff(bp, 0, bits, 0));
970
uint32 b1 = (PIXEL(rp, 0) != 0 ? 0 : finddiff(rp, 0, bits, 0));
974
b2 = finddiff2(rp, b1, bits, PIXEL(rp,b1));
977
if (!(-3 <= d && d <= 3)) { /* horizontal mode */
978
a2 = finddiff2(bp, a1, bits, PIXEL(bp,a1));
979
putcode(tif, &horizcode);
980
if (a0+a1 == 0 || PIXEL(bp, a0) == 0) {
981
putspan(tif, a1-a0, TIFFFaxWhiteCodes);
982
putspan(tif, a2-a1, TIFFFaxBlackCodes);
984
putspan(tif, a1-a0, TIFFFaxBlackCodes);
985
putspan(tif, a2-a1, TIFFFaxWhiteCodes);
988
} else { /* vertical mode */
989
putcode(tif, &vcodes[d+3]);
992
} else { /* pass mode */
993
putcode(tif, &passcode);
998
a1 = finddiff(bp, a0, bits, PIXEL(bp,a0));
999
b1 = finddiff(rp, a0, bits, !PIXEL(bp,a0));
1000
b1 = finddiff(rp, b1, bits, PIXEL(bp,a0));
1007
* Encode a buffer of pixels.
1010
Fax3Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
1012
Fax3CodecState* sp = EncoderState(tif);
1015
while ((long)cc > 0) {
1016
if ((sp->b.mode & FAXMODE_NOEOL) == 0)
1018
if (is2DEncoding(sp)) {
1019
if (sp->tag == G3_1D) {
1020
if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1024
if (!Fax3Encode2DRow(tif, bp, sp->refline,
1033
_TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1035
if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1038
bp += sp->b.rowbytes;
1039
cc -= sp->b.rowbytes;
1045
Fax3PostEncode(TIFF* tif)
1047
Fax3CodecState* sp = EncoderState(tif);
1050
Fax3FlushBits(tif, sp);
1055
Fax3Close(TIFF* tif)
1057
if ((Fax3State(tif)->mode & FAXMODE_NORTC) == 0) {
1058
Fax3CodecState* sp = EncoderState(tif);
1059
unsigned int code = EOL;
1060
unsigned int length = 12;
1063
if (is2DEncoding(sp))
1064
code = (code<<1) | (sp->tag == G3_1D), length++;
1065
for (i = 0; i < 6; i++)
1066
Fax3PutBits(tif, code, length);
1067
Fax3FlushBits(tif, sp);
1072
Fax3Cleanup(TIFF* tif)
1074
Fax3CodecState* sp = DecoderState(tif);
1078
tif->tif_tagmethods.vgetfield = sp->b.vgetparent;
1079
tif->tif_tagmethods.vsetfield = sp->b.vsetparent;
1080
tif->tif_tagmethods.printdir = sp->b.printdir;
1083
_TIFFfree(sp->runs);
1085
_TIFFfree(sp->refline);
1087
if (Fax3State(tif)->subaddress)
1088
_TIFFfree(Fax3State(tif)->subaddress);
1089
_TIFFfree(tif->tif_data);
1090
tif->tif_data = NULL;
1092
_TIFFSetDefaultCompressionState(tif);
1095
#define FIELD_BADFAXLINES (FIELD_CODEC+0)
1096
#define FIELD_CLEANFAXDATA (FIELD_CODEC+1)
1097
#define FIELD_BADFAXRUN (FIELD_CODEC+2)
1098
#define FIELD_RECVPARAMS (FIELD_CODEC+3)
1099
#define FIELD_SUBADDRESS (FIELD_CODEC+4)
1100
#define FIELD_RECVTIME (FIELD_CODEC+5)
1101
#define FIELD_FAXDCS (FIELD_CODEC+6)
1103
#define FIELD_OPTIONS (FIELD_CODEC+7)
1105
static const TIFFFieldInfo faxFieldInfo[] = {
1106
{ TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, FIELD_PSEUDO,
1107
FALSE, FALSE, "FaxMode" },
1108
{ TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, FIELD_PSEUDO,
1109
FALSE, FALSE, "FaxFillFunc" },
1110
{ TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, FIELD_BADFAXLINES,
1111
TRUE, FALSE, "BadFaxLines" },
1112
{ TIFFTAG_BADFAXLINES, 1, 1, TIFF_SHORT, FIELD_BADFAXLINES,
1113
TRUE, FALSE, "BadFaxLines" },
1114
{ TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, FIELD_CLEANFAXDATA,
1115
TRUE, FALSE, "CleanFaxData" },
1116
{ TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_LONG, FIELD_BADFAXRUN,
1117
TRUE, FALSE, "ConsecutiveBadFaxLines" },
1118
{ TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_SHORT, FIELD_BADFAXRUN,
1119
TRUE, FALSE, "ConsecutiveBadFaxLines" },
1120
{ TIFFTAG_FAXRECVPARAMS, 1, 1, TIFF_LONG, FIELD_RECVPARAMS,
1121
TRUE, FALSE, "FaxRecvParams" },
1122
{ TIFFTAG_FAXSUBADDRESS, -1,-1, TIFF_ASCII, FIELD_SUBADDRESS,
1123
TRUE, FALSE, "FaxSubAddress" },
1124
{ TIFFTAG_FAXRECVTIME, 1, 1, TIFF_LONG, FIELD_RECVTIME,
1125
TRUE, FALSE, "FaxRecvTime" },
1126
{ TIFFTAG_FAXDCS, -1,-1, TIFF_ASCII, FIELD_FAXDCS,
1127
TRUE, FALSE, "FaxDcs" },
1129
static const TIFFFieldInfo fax3FieldInfo[] = {
1130
{ TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS,
1131
FALSE, FALSE, "Group3Options" },
1133
static const TIFFFieldInfo fax4FieldInfo[] = {
1134
{ TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS,
1135
FALSE, FALSE, "Group4Options" },
1137
#define N(a) (sizeof (a) / sizeof (a[0]))
1140
Fax3VSetField(TIFF* tif, ttag_t tag, va_list ap)
1142
Fax3BaseState* sp = Fax3State(tif);
1143
const TIFFFieldInfo* fip;
1146
assert(sp->vsetparent != 0);
1149
case TIFFTAG_FAXMODE:
1150
sp->mode = va_arg(ap, int);
1151
return 1; /* NB: pseudo tag */
1152
case TIFFTAG_FAXFILLFUNC:
1153
DecoderState(tif)->fill = va_arg(ap, TIFFFaxFillFunc);
1154
return 1; /* NB: pseudo tag */
1155
case TIFFTAG_GROUP3OPTIONS:
1156
/* XXX: avoid reading options if compression mismatches. */
1157
if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX3)
1158
sp->groupoptions = va_arg(ap, uint32);
1160
case TIFFTAG_GROUP4OPTIONS:
1161
/* XXX: avoid reading options if compression mismatches. */
1162
if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4)
1163
sp->groupoptions = va_arg(ap, uint32);
1165
case TIFFTAG_BADFAXLINES:
1166
sp->badfaxlines = va_arg(ap, uint32);
1168
case TIFFTAG_CLEANFAXDATA:
1169
sp->cleanfaxdata = (uint16) va_arg(ap, int);
1171
case TIFFTAG_CONSECUTIVEBADFAXLINES:
1172
sp->badfaxrun = va_arg(ap, uint32);
1174
case TIFFTAG_FAXRECVPARAMS:
1175
sp->recvparams = va_arg(ap, uint32);
1177
case TIFFTAG_FAXSUBADDRESS:
1178
_TIFFsetString(&sp->subaddress, va_arg(ap, char*));
1180
case TIFFTAG_FAXRECVTIME:
1181
sp->recvtime = va_arg(ap, uint32);
1183
case TIFFTAG_FAXDCS:
1184
_TIFFsetString(&sp->faxdcs, va_arg(ap, char*));
1187
return (*sp->vsetparent)(tif, tag, ap);
1190
if ((fip = _TIFFFieldWithTag(tif, tag)))
1191
TIFFSetFieldBit(tif, fip->field_bit);
1195
tif->tif_flags |= TIFF_DIRTYDIRECT;
1200
Fax3VGetField(TIFF* tif, ttag_t tag, va_list ap)
1202
Fax3BaseState* sp = Fax3State(tif);
1207
case TIFFTAG_FAXMODE:
1208
*va_arg(ap, int*) = sp->mode;
1210
case TIFFTAG_FAXFILLFUNC:
1211
*va_arg(ap, TIFFFaxFillFunc*) = DecoderState(tif)->fill;
1213
case TIFFTAG_GROUP3OPTIONS:
1214
case TIFFTAG_GROUP4OPTIONS:
1215
*va_arg(ap, uint32*) = sp->groupoptions;
1217
case TIFFTAG_BADFAXLINES:
1218
*va_arg(ap, uint32*) = sp->badfaxlines;
1220
case TIFFTAG_CLEANFAXDATA:
1221
*va_arg(ap, uint16*) = sp->cleanfaxdata;
1223
case TIFFTAG_CONSECUTIVEBADFAXLINES:
1224
*va_arg(ap, uint32*) = sp->badfaxrun;
1226
case TIFFTAG_FAXRECVPARAMS:
1227
*va_arg(ap, uint32*) = sp->recvparams;
1229
case TIFFTAG_FAXSUBADDRESS:
1230
*va_arg(ap, char**) = sp->subaddress;
1232
case TIFFTAG_FAXRECVTIME:
1233
*va_arg(ap, uint32*) = sp->recvtime;
1235
case TIFFTAG_FAXDCS:
1236
*va_arg(ap, char**) = sp->faxdcs;
1239
return (*sp->vgetparent)(tif, tag, ap);
1245
Fax3PrintDir(TIFF* tif, FILE* fd, long flags)
1247
Fax3BaseState* sp = Fax3State(tif);
1252
if (TIFFFieldSet(tif,FIELD_OPTIONS)) {
1253
const char* sep = " ";
1254
if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4) {
1255
fprintf(fd, " Group 4 Options:");
1256
if (sp->groupoptions & GROUP4OPT_UNCOMPRESSED)
1257
fprintf(fd, "%suncompressed data", sep);
1260
fprintf(fd, " Group 3 Options:");
1261
if (sp->groupoptions & GROUP3OPT_2DENCODING)
1262
fprintf(fd, "%s2-d encoding", sep), sep = "+";
1263
if (sp->groupoptions & GROUP3OPT_FILLBITS)
1264
fprintf(fd, "%sEOL padding", sep), sep = "+";
1265
if (sp->groupoptions & GROUP3OPT_UNCOMPRESSED)
1266
fprintf(fd, "%suncompressed data", sep);
1268
fprintf(fd, " (%lu = 0x%lx)\n",
1269
(unsigned long) sp->groupoptions,
1270
(unsigned long) sp->groupoptions);
1272
if (TIFFFieldSet(tif,FIELD_CLEANFAXDATA)) {
1273
fprintf(fd, " Fax Data:");
1274
switch (sp->cleanfaxdata) {
1275
case CLEANFAXDATA_CLEAN:
1276
fprintf(fd, " clean");
1278
case CLEANFAXDATA_REGENERATED:
1279
fprintf(fd, " receiver regenerated");
1281
case CLEANFAXDATA_UNCLEAN:
1282
fprintf(fd, " uncorrected errors");
1285
fprintf(fd, " (%u = 0x%x)\n",
1286
sp->cleanfaxdata, sp->cleanfaxdata);
1288
if (TIFFFieldSet(tif,FIELD_BADFAXLINES))
1289
fprintf(fd, " Bad Fax Lines: %lu\n",
1290
(unsigned long) sp->badfaxlines);
1291
if (TIFFFieldSet(tif,FIELD_BADFAXRUN))
1292
fprintf(fd, " Consecutive Bad Fax Lines: %lu\n",
1293
(unsigned long) sp->badfaxrun);
1294
if (TIFFFieldSet(tif,FIELD_RECVPARAMS))
1295
fprintf(fd, " Fax Receive Parameters: %08lx\n",
1296
(unsigned long) sp->recvparams);
1297
if (TIFFFieldSet(tif,FIELD_SUBADDRESS))
1298
fprintf(fd, " Fax SubAddress: %s\n", sp->subaddress);
1299
if (TIFFFieldSet(tif,FIELD_RECVTIME))
1300
fprintf(fd, " Fax Receive Time: %lu secs\n",
1301
(unsigned long) sp->recvtime);
1302
if (TIFFFieldSet(tif,FIELD_FAXDCS))
1303
fprintf(fd, " Fax DCS: %s\n", sp->faxdcs);
1307
InitCCITTFax3(TIFF* tif)
1312
* Allocate state block so tag methods have storage to record values.
1314
tif->tif_data = (tidata_t)
1315
_TIFFmalloc(sizeof (Fax3CodecState));
1317
if (tif->tif_data == NULL) {
1318
TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax3",
1319
"%s: No space for state block", tif->tif_name);
1323
sp = Fax3State(tif);
1324
sp->rw_mode = tif->tif_mode;
1327
* Merge codec-specific tag information and
1328
* override parent get/set field methods.
1330
_TIFFMergeFieldInfo(tif, faxFieldInfo, N(faxFieldInfo));
1331
sp->vgetparent = tif->tif_tagmethods.vgetfield;
1332
tif->tif_tagmethods.vgetfield = Fax3VGetField; /* hook for codec tags */
1333
sp->vsetparent = tif->tif_tagmethods.vsetfield;
1334
tif->tif_tagmethods.vsetfield = Fax3VSetField; /* hook for codec tags */
1335
sp->printdir = tif->tif_tagmethods.printdir;
1336
tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */
1337
sp->groupoptions = 0;
1339
sp->subaddress = NULL;
1342
if (sp->rw_mode == O_RDONLY) /* FIXME: improve for in place update */
1343
tif->tif_flags |= TIFF_NOBITREV; /* decoder does bit reversal */
1344
DecoderState(tif)->runs = NULL;
1345
TIFFSetField(tif, TIFFTAG_FAXFILLFUNC, _TIFFFax3fillruns);
1346
EncoderState(tif)->refline = NULL;
1349
* Install codec methods.
1351
tif->tif_setupdecode = Fax3SetupState;
1352
tif->tif_predecode = Fax3PreDecode;
1353
tif->tif_decoderow = Fax3Decode1D;
1354
tif->tif_decodestrip = Fax3Decode1D;
1355
tif->tif_decodetile = Fax3Decode1D;
1356
tif->tif_setupencode = Fax3SetupState;
1357
tif->tif_preencode = Fax3PreEncode;
1358
tif->tif_postencode = Fax3PostEncode;
1359
tif->tif_encoderow = Fax3Encode;
1360
tif->tif_encodestrip = Fax3Encode;
1361
tif->tif_encodetile = Fax3Encode;
1362
tif->tif_close = Fax3Close;
1363
tif->tif_cleanup = Fax3Cleanup;
1369
TIFFInitCCITTFax3(TIFF* tif, int scheme)
1372
if (InitCCITTFax3(tif)) {
1373
_TIFFMergeFieldInfo(tif, fax3FieldInfo, N(fax3FieldInfo));
1376
* The default format is Class/F-style w/o RTC.
1378
return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF);
1384
* CCITT Group 4 (T.6) Facsimile-compatible
1385
* Compression Scheme Support.
1388
#define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
1390
* Decode the requested amount of G4-encoded data.
1393
Fax4Decode(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
1395
DECLARE_STATE_2D(tif, sp, "Fax4Decode");
1398
CACHE_STATE(tif, sp);
1399
while ((long)occ > 0) {
1402
pa = thisrun = sp->curruns;
1406
printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
1407
printf("-------------------- %d\n", tif->tif_row);
1413
(*sp->fill)(buf, thisrun, pa, lastx);
1414
SETVALUE(0); /* imaginary change for reference */
1415
SWAP(uint32*, sp->curruns, sp->refruns);
1416
buf += sp->b.rowbytes;
1417
occ -= sp->b.rowbytes;
1421
NeedBits16( 13, BADG4 );
1424
if( GetBits(13) != 0x1001 )
1425
fputs( "Bad RTC\n", stderr );
1428
(*sp->fill)(buf, thisrun, pa, lastx);
1429
UNCACHE_STATE(tif, sp);
1432
UNCACHE_STATE(tif, sp);
1438
* Encode the requested amount of data.
1441
Fax4Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
1443
Fax3CodecState *sp = EncoderState(tif);
1446
while ((long)cc > 0) {
1447
if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels))
1449
_TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1450
bp += sp->b.rowbytes;
1451
cc -= sp->b.rowbytes;
1457
Fax4PostEncode(TIFF* tif)
1459
Fax3CodecState *sp = EncoderState(tif);
1461
/* terminate strip w/ EOFB */
1462
Fax3PutBits(tif, EOL, 12);
1463
Fax3PutBits(tif, EOL, 12);
1465
Fax3FlushBits(tif, sp);
1470
TIFFInitCCITTFax4(TIFF* tif, int scheme)
1473
if (InitCCITTFax3(tif)) { /* reuse G3 support */
1474
_TIFFMergeFieldInfo(tif, fax4FieldInfo, N(fax4FieldInfo));
1476
tif->tif_decoderow = Fax4Decode;
1477
tif->tif_decodestrip = Fax4Decode;
1478
tif->tif_decodetile = Fax4Decode;
1479
tif->tif_encoderow = Fax4Encode;
1480
tif->tif_encodestrip = Fax4Encode;
1481
tif->tif_encodetile = Fax4Encode;
1482
tif->tif_postencode = Fax4PostEncode;
1484
* Suppress RTC at the end of each strip.
1486
return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC);
1492
* CCITT Group 3 1-D Modified Huffman RLE Compression Support.
1493
* (Compression algorithms 2 and 32771)
1497
* Decode the requested amount of RLE-encoded data.
1500
Fax3DecodeRLE(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
1502
DECLARE_STATE(tif, sp, "Fax3DecodeRLE");
1503
int mode = sp->b.mode;
1506
CACHE_STATE(tif, sp);
1507
thisrun = sp->curruns;
1508
while ((long)occ > 0) {
1513
printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
1514
printf("-------------------- %d\n", tif->tif_row);
1518
(*sp->fill)(buf, thisrun, pa, lastx);
1520
* Cleanup at the end of the row.
1522
if (mode & FAXMODE_BYTEALIGN) {
1523
int n = BitsAvail - (BitsAvail &~ 7);
1525
} else if (mode & FAXMODE_WORDALIGN) {
1526
int n = BitsAvail - (BitsAvail &~ 15);
1528
if (BitsAvail == 0 && !isAligned(cp, uint16))
1531
buf += sp->b.rowbytes;
1532
occ -= sp->b.rowbytes;
1535
EOFRLE: /* premature EOF */
1536
(*sp->fill)(buf, thisrun, pa, lastx);
1537
UNCACHE_STATE(tif, sp);
1540
UNCACHE_STATE(tif, sp);
1545
TIFFInitCCITTRLE(TIFF* tif, int scheme)
1548
if (InitCCITTFax3(tif)) { /* reuse G3 support */
1549
tif->tif_decoderow = Fax3DecodeRLE;
1550
tif->tif_decodestrip = Fax3DecodeRLE;
1551
tif->tif_decodetile = Fax3DecodeRLE;
1553
* Suppress RTC+EOLs when encoding and byte-align data.
1555
return TIFFSetField(tif, TIFFTAG_FAXMODE,
1556
FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_BYTEALIGN);
1562
TIFFInitCCITTRLEW(TIFF* tif, int scheme)
1565
if (InitCCITTFax3(tif)) { /* reuse G3 support */
1566
tif->tif_decoderow = Fax3DecodeRLE;
1567
tif->tif_decodestrip = Fax3DecodeRLE;
1568
tif->tif_decodetile = Fax3DecodeRLE;
1570
* Suppress RTC+EOLs when encoding and word-align data.
1572
return TIFFSetField(tif, TIFFTAG_FAXMODE,
1573
FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_WORDALIGN);
1577
#endif /* CCITT_SUPPORT */
1579
/* vim: set ts=8 sts=8 sw=8 noet: */
added
removed
FreeImage/Source/LibTIFF/tif_fax3.c
