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Diffstat (limited to 'tiff/libtiff/tif_fax3.c')
| -rwxr-xr-x | tiff/libtiff/tif_fax3.c | 1595 |
1 files changed, 1595 insertions, 0 deletions
diff --git a/tiff/libtiff/tif_fax3.c b/tiff/libtiff/tif_fax3.c new file mode 100755 index 0000000..2b2dccd --- /dev/null +++ b/tiff/libtiff/tif_fax3.c @@ -0,0 +1,1595 @@ +/* $Id: tif_fax3.c,v 1.74 2012-06-21 02:01:31 fwarmerdam 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 */ + tmsize_t 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 */ + + TIFFVGetMethod vgetparent; /* super-class method */ + TIFFVSetMethod vsetparent; /* super-class method */ + TIFFPrintMethod printdir; /* 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 */ + + int line; +} 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) ((((size_t)(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 -= (tmsize_t)((uint8*) cp - tif->tif_rawcp); \ + tif->tif_rawcp = (uint8*) cp; \ +} while (0) + +/* + * Setup state for decoding a strip. + */ +static int +Fax3PreDecode(TIFF* tif, uint16 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; + } + sp->line = 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 line, uint32 a0) +{ + TIFFErrorExt(tif->tif_clientdata, module, "Bad code word at line %u of %s %u (x %u)", + line, isTiled(tif) ? "tile" : "strip", + (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), + a0); +} +#define unexpected(table, a0) Fax3Unexpected(module, tif, sp->line, a0) + +static void +Fax3Extension(const char* module, TIFF* tif, uint32 line, uint32 a0) +{ + TIFFErrorExt(tif->tif_clientdata, module, + "Uncompressed data (not supported) at line %u of %s %u (x %u)", + line, isTiled(tif) ? "tile" : "strip", + (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), + a0); +} +#define extension(a0) Fax3Extension(module, tif, sp->line, a0) + +static void +Fax3BadLength(const char* module, TIFF* tif, uint32 line, uint32 a0, uint32 lastx) +{ + TIFFWarningExt(tif->tif_clientdata, module, "%s at line %u of %s %u (got %u, expected %u)", + a0 < lastx ? "Premature EOL" : "Line length mismatch", + line, isTiled(tif) ? "tile" : "strip", + (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), + a0, lastx); +} +#define badlength(a0,lastx) Fax3BadLength(module, tif, sp->line, a0, lastx) + +static void +Fax3PrematureEOF(const char* module, TIFF* tif, uint32 line, uint32 a0) +{ + TIFFWarningExt(tif->tif_clientdata, module, "Premature EOF at line %u of %s %u (x %u)", + line, isTiled(tif) ? "tile" : "strip", + (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), + a0); +} +#define prematureEOF(a0) Fax3PrematureEOF(module, tif, sp->line, a0) + +#define Nop + +/* + * Decode the requested amount of G3 1D-encoded data. + */ +static int +Fax3Decode1D(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s) +{ + DECLARE_STATE(tif, sp, "Fax3Decode1D"); + (void) s; + if (occ % sp->b.rowbytes) + { + TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be read"); + return (-1); + } + CACHE_STATE(tif, sp); + thisrun = sp->curruns; + while (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; + sp->line++; + 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, uint8* buf, tmsize_t occ, uint16 s) +{ + DECLARE_STATE_2D(tif, sp, "Fax3Decode2D"); + int is1D; /* current line is 1d/2d-encoded */ + (void) s; + if (occ % sp->b.rowbytes) + { + TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be read"); + return (-1); + } + CACHE_STATE(tif, sp); + while (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); + SETVALUE(0); /* imaginary change for reference */ + SWAP(uint32*, sp->curruns, sp->refruns); + buf += sp->b.rowbytes; + occ -= sp->b.rowbytes; + sp->line++; + 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_UNSIGNED_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 int +Fax3FixupTags(TIFF* tif) +{ + (void) tif; + return (1); +} + +/* + * 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) +{ + static const char module[] = "Fax3SetupState"; + TIFFDirectory* td = &tif->tif_dir; + Fax3BaseState* sp = Fax3State(tif); + int needsRefLine; + Fax3CodecState* dsp = (Fax3CodecState*) Fax3State(tif); + tmsize_t rowbytes; + uint32 rowpixels, nruns; + + if (td->td_bitspersample != 1) { + TIFFErrorExt(tif->tif_clientdata, module, + "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 = rowbytes; + sp->rowpixels = rowpixels; + /* + * Allocate any additional space required for decoding/encoding. + */ + needsRefLine = ( + (sp->groupoptions & GROUP3OPT_2DENCODING) || + td->td_compression == COMPRESSION_CCITTFAX4 + ); + + /* + Assure that allocation computations do not overflow. + + TIFFroundup and TIFFSafeMultiply return zero on integer overflow + */ + dsp->runs=(uint32*) NULL; + nruns = TIFFroundup_32(rowpixels,32); + if (needsRefLine) { + nruns = TIFFSafeMultiply(uint32,nruns,2); + } + if ((nruns == 0) || (TIFFSafeMultiply(uint32,nruns,2) == 0)) { + TIFFErrorExt(tif->tif_clientdata, tif->tif_name, + "Row pixels integer overflow (rowpixels %u)", + rowpixels); + return (0); + } + dsp->runs = (uint32*) _TIFFCheckMalloc(tif, + TIFFSafeMultiply(uint32,nruns,2), + sizeof (uint32), + "for Group 3/4 run arrays"); + if (dsp->runs == NULL) + return (0); + memset( dsp->runs, 0, TIFFSafeMultiply(uint32,nruns,2)*sizeof(uint32)); + dsp->curruns = dsp->runs; + if (needsRefLine) + dsp->refruns = dsp->runs + nruns; + 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) { + TIFFErrorExt(tif->tif_clientdata, module, + "No space for Group 3/4 reference line"); + 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++ = (uint8) (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++ = (uint8) 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); \ + } \ + assert( length < 9 ); \ + 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, uint16 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; + sp->line = 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 >= (int32)(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 >= (int32)(8 * sizeof(long))) && (0 == *lp)) { + 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 >= (int32)(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 >= (int32)(8 * sizeof(long))) && (~0 == *lp)) { + 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, 0 }; /* 001 */ +static const tableentry passcode = + { 4, 0x1, 0 }; /* 0001 */ +static const tableentry vcodes[7] = { + { 7, 0x03, 0 }, /* 0000 011 */ + { 6, 0x03, 0 }, /* 0000 11 */ + { 3, 0x03, 0 }, /* 011 */ + { 1, 0x1, 0 }, /* 1 */ + { 3, 0x2, 0 }, /* 010 */ + { 6, 0x02, 0 }, /* 0000 10 */ + { 7, 0x02, 0 } /* 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, uint8* bp, tmsize_t cc, uint16 s) +{ + static const char module[] = "Fax3Encode"; + Fax3CodecState* sp = EncoderState(tif); + (void) s; + if (cc % sp->b.rowbytes) + { + TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be written"); + return (0); + } + while (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) +{ + Fax3CodecState* sp = DecoderState(tif); + + assert(sp != 0); + + tif->tif_tagmethods.vgetfield = sp->b.vgetparent; + tif->tif_tagmethods.vsetfield = sp->b.vsetparent; + tif->tif_tagmethods.printdir = sp->b.printdir; + + if (sp->runs) + _TIFFfree(sp->runs); + if (sp->refline) + _TIFFfree(sp->refline); + + _TIFFfree(tif->tif_data); + tif->tif_data = NULL; + + _TIFFSetDefaultCompressionState(tif); +} + +#define FIELD_BADFAXLINES (FIELD_CODEC+0) +#define FIELD_CLEANFAXDATA (FIELD_CODEC+1) +#define FIELD_BADFAXRUN (FIELD_CODEC+2) + +#define FIELD_OPTIONS (FIELD_CODEC+7) + +static const TIFFField faxFields[] = { + { TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, FALSE, FALSE, "FaxMode", NULL }, + { TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, 0, TIFF_SETGET_OTHER, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, FALSE, FALSE, "FaxFillFunc", NULL }, + { TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, TIFF_SETGET_UINT32, FIELD_BADFAXLINES, TRUE, FALSE, "BadFaxLines", NULL }, + { TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, 0, TIFF_SETGET_UINT16, TIFF_SETGET_UINT16, FIELD_CLEANFAXDATA, TRUE, FALSE, "CleanFaxData", NULL }, + { TIFFTAG_CONSECUTIVEBADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, TIFF_SETGET_UINT32, FIELD_BADFAXRUN, TRUE, FALSE, "ConsecutiveBadFaxLines", NULL }}; +static const TIFFField fax3Fields[] = { + { TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, TIFF_SETGET_UINT32, FIELD_OPTIONS, FALSE, FALSE, "Group3Options", NULL }, +}; +static const TIFFField fax4Fields[] = { + { TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, TIFF_SETGET_UINT32, FIELD_OPTIONS, FALSE, FALSE, "Group4Options", NULL }, +}; + +static int +Fax3VSetField(TIFF* tif, uint32 tag, va_list ap) +{ + Fax3BaseState* sp = Fax3State(tif); + const TIFFField* fip; + + assert(sp != 0); + assert(sp->vsetparent != 0); + + switch (tag) { + case TIFFTAG_FAXMODE: + sp->mode = (int) 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 = (uint32) 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 = (uint32) va_arg(ap, uint32); + break; + case TIFFTAG_BADFAXLINES: + sp->badfaxlines = (uint32) va_arg(ap, uint32); + break; + case TIFFTAG_CLEANFAXDATA: + sp->cleanfaxdata = (uint16) va_arg(ap, uint16_vap); + break; + case TIFFTAG_CONSECUTIVEBADFAXLINES: + sp->badfaxrun = (uint32) va_arg(ap, uint32); + break; + default: + return (*sp->vsetparent)(tif, tag, ap); + } + + if ((fip = TIFFFieldWithTag(tif, tag))) + TIFFSetFieldBit(tif, fip->field_bit); + else + return 0; + + tif->tif_flags |= TIFF_DIRTYDIRECT; + return 1; +} + +static int +Fax3VGetField(TIFF* tif, uint32 tag, va_list ap) +{ + Fax3BaseState* sp = Fax3State(tif); + + assert(sp != 0); + + 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; + default: + return (*sp->vgetparent)(tif, tag, ap); + } + return (1); +} + +static void +Fax3PrintDir(TIFF* tif, FILE* fd, long flags) +{ + Fax3BaseState* sp = Fax3State(tif); + + assert(sp != 0); + + (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 (sp->printdir) + (*sp->printdir)(tif, fd, flags); +} + +static int +InitCCITTFax3(TIFF* tif) +{ + static const char module[] = "InitCCITTFax3"; + Fax3BaseState* sp; + + /* + * Merge codec-specific tag information. + */ + if (!_TIFFMergeFields(tif, faxFields, TIFFArrayCount(faxFields))) { + TIFFErrorExt(tif->tif_clientdata, "InitCCITTFax3", + "Merging common CCITT Fax codec-specific tags failed"); + return 0; + } + + /* + * Allocate state block so tag methods have storage to record values. + */ + tif->tif_data = (uint8*) + _TIFFmalloc(sizeof (Fax3CodecState)); + + if (tif->tif_data == NULL) { + TIFFErrorExt(tif->tif_clientdata, module, + "No space for state block"); + return (0); + } + + sp = Fax3State(tif); + sp->rw_mode = tif->tif_mode; + + /* + * Override parent get/set field methods. + */ + 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 */ + sp->printdir = tif->tif_tagmethods.printdir; + tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */ + sp->groupoptions = 0; + + 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_fixuptags = Fax3FixupTags; + 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) +{ + (void) scheme; + if (InitCCITTFax3(tif)) { + /* + * Merge codec-specific tag information. + */ + if (!_TIFFMergeFields(tif, fax3Fields, + TIFFArrayCount(fax3Fields))) { + TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax3", + "Merging CCITT Fax 3 codec-specific tags failed"); + return 0; + } + + /* + * The default format is Class/F-style w/o RTC. + */ + return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF); + } else + return 01; +} + +/* + * 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, uint8* buf, tmsize_t occ, uint16 s) +{ + DECLARE_STATE_2D(tif, sp, "Fax4Decode"); + (void) s; + if (occ % sp->b.rowbytes) + { + TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be read"); + return (-1); + } + CACHE_STATE(tif, sp); + while (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); + SETVALUE(0); /* imaginary change for reference */ + SWAP(uint32*, sp->curruns, sp->refruns); + buf += sp->b.rowbytes; + occ -= sp->b.rowbytes; + sp->line++; + continue; + EOFG4: + NeedBits16( 13, BADG4 ); + BADG4: +#ifdef FAX3_DEBUG + if( GetBits(13) != 0x1001 ) + fputs( "Bad EOFB\n", stderr ); +#endif + ClrBits( 13 ); + (*sp->fill)(buf, thisrun, pa, lastx); + UNCACHE_STATE(tif, sp); + return ( sp->line ? 1 : -1); /* don't error on badly-terminated strips */ + } + UNCACHE_STATE(tif, sp); + return (1); +} +#undef SWAP + +/* + * Encode the requested amount of data. + */ +static int +Fax4Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) +{ + static const char module[] = "Fax4Encode"; + Fax3CodecState *sp = EncoderState(tif); + (void) s; + if (cc % sp->b.rowbytes) + { + TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be written"); + return (0); + } + while (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) +{ + (void) scheme; + if (InitCCITTFax3(tif)) { /* reuse G3 support */ + /* + * Merge codec-specific tag information. + */ + if (!_TIFFMergeFields(tif, fax4Fields, + TIFFArrayCount(fax4Fields))) { + TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax4", + "Merging CCITT Fax 4 codec-specific tags failed"); + return 0; + } + + 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, uint8* buf, tmsize_t occ, uint16 s) +{ + DECLARE_STATE(tif, sp, "Fax3DecodeRLE"); + int mode = sp->b.mode; + (void) s; + if (occ % sp->b.rowbytes) + { + TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be read"); + return (-1); + } + CACHE_STATE(tif, sp); + thisrun = sp->curruns; + while (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; + sp->line++; + 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) +{ + (void) 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) +{ + (void) 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: */ +/* + * Local Variables: + * mode: c + * c-basic-offset: 8 + * fill-column: 78 + * End: + */ |