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tif_fax3.c
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/* $Id: tif_fax3.c,v 1.43.2.10 2010-06-09 17:16:58 bfriesen Exp $ */
/*
* Copyright (c) 1990-1997 Sam Leffler
* Copyright (c) 1991-1997 Silicon Graphics, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the names of
* Sam Leffler and Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Sam Leffler and Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include "tiffiop.h"
#ifdef CCITT_SUPPORT
/*
* TIFF Library.
*
* CCITT Group 3 (T.4) and Group 4 (T.6) Compression Support.
*
* This file contains support for decoding and encoding TIFF
* compression algorithms 2, 3, 4, and 32771.
*
* Decoder support is derived, with permission, from the code
* in Frank Cringle's viewfax program;
* Copyright (C) 1990, 1995 Frank D. Cringle.
*/
#include "tif_fax3.h"
#define G3CODES
#include "t4.h"
#include <stdio.h>
/*
* Compression+decompression state blocks are
* derived from this ``base state'' block.
*/
typedef struct {
int rw_mode; /* O_RDONLY for decode, else encode */
int mode; /* operating mode */
uint32 rowbytes; /* bytes in a decoded scanline */
uint32 rowpixels; /* pixels in a scanline */
uint16 cleanfaxdata; /* CleanFaxData tag */
uint32 badfaxrun; /* BadFaxRun tag */
uint32 badfaxlines; /* BadFaxLines tag */
uint32 groupoptions; /* Group 3/4 options tag */
uint32 recvparams; /* encoded Class 2 session params */
char* subaddress; /* subaddress string */
uint32 recvtime; /* time spent receiving (secs) */
char* faxdcs; /* Table 2/T.30 encoded session params */
TIFFVGetMethod vgetparent; /* super-class method */
TIFFVSetMethod vsetparent; /* super-class method */
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) ((((unsigned long)(p)) & (sizeof (t)-1)) == 0)
/*
* Group 3 and Group 4 Decoding.
*/
/*
* These macros glue the TIFF library state to
* the state expected by Frank's decoder.
*/
#define DECLARE_STATE(tif, sp, mod) \
static const char module[] = mod; \
Fax3CodecState* sp = DecoderState(tif); \
int a0; /* reference element */ \
int lastx = sp->b.rowpixels; /* last element in row */ \
uint32 BitAcc; /* bit accumulator */ \
int BitsAvail; /* # valid bits in BitAcc */ \
int RunLength; /* length of current run */ \
unsigned char* cp; /* next byte of input data */ \
unsigned char* ep; /* end of input data */ \
uint32* pa; /* place to stuff next run */ \
uint32* thisrun; /* current row's run array */ \
int EOLcnt; /* # EOL codes recognized */ \
const unsigned char* bitmap = sp->bitmap; /* input data bit reverser */ \
const TIFFFaxTabEnt* TabEnt
#define DECLARE_STATE_2D(tif, sp, mod) \
DECLARE_STATE(tif, sp, mod); \
int b1; /* next change on prev line */ \
uint32* pb /* next run in reference line */\
/*
* Load any state that may be changed during decoding.
*/
#define CACHE_STATE(tif, sp) do { \
BitAcc = sp->data; \
BitsAvail = sp->bit; \
EOLcnt = sp->EOLcnt; \
cp = (unsigned char*) tif->tif_rawcp; \
ep = cp + tif->tif_rawcc; \
} while (0)
/*
* Save state possibly changed during decoding.
*/
#define UNCACHE_STATE(tif, sp) do { \
sp->bit = BitsAvail; \
sp->data = BitAcc; \
sp->EOLcnt = EOLcnt; \
tif->tif_rawcc -= (tidata_t) cp - tif->tif_rawcp; \
tif->tif_rawcp = (tidata_t) cp; \
} while (0)
/*
* Setup state for decoding a strip.
*/
static int
Fax3PreDecode(TIFF* tif, tsample_t s)
{
Fax3CodecState* sp = DecoderState(tif);
(void) s;
assert(sp != NULL);
sp->bit = 0; /* force initial read */
sp->data = 0;
sp->EOLcnt = 0; /* force initial scan for EOL */
/*
* Decoder assumes lsb-to-msb bit order. Note that we select
* this here rather than in Fax3SetupState so that viewers can
* hold the image open, fiddle with the FillOrder tag value,
* and then re-decode the image. Otherwise they'd need to close
* and open the image to get the state reset.
*/
sp->bitmap =
TIFFGetBitRevTable(tif->tif_dir.td_fillorder != FILLORDER_LSB2MSB);
if (sp->refruns) { /* init reference line to white */
sp->refruns[0] = (uint32) sp->b.rowpixels;
sp->refruns[1] = 0;
}
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, "%s: Bad code word at line %u of %s %u (x %u)",
tif->tif_name, 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,
"%s: Uncompressed data (not supported) at line %u of %s %u (x %u)",
tif->tif_name, 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: %s at line %u of %s %u (got %u, expected %u)",
tif->tif_name,
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, "%s: Premature EOF at line %u of %s %u (x %u)",
tif->tif_name,
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, tidata_t buf, tsize_t occ, tsample_t s)
{
DECLARE_STATE(tif, sp, "Fax3Decode1D");
(void) s;
CACHE_STATE(tif, sp);
thisrun = sp->curruns;
while ((long)occ > 0) {
a0 = 0;
RunLength = 0;
pa = thisrun;
#ifdef FAX3_DEBUG
printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
printf("-------------------- %d\n", tif->tif_row);
fflush(stdout);
#endif
SYNC_EOL(EOF1D);
EXPAND1D(EOF1Da);
(*sp->fill)(buf, thisrun, pa, lastx);
buf += sp->b.rowbytes;
occ -= sp->b.rowbytes;
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, tidata_t buf, tsize_t occ, tsample_t s)
{
DECLARE_STATE_2D(tif, sp, "Fax3Decode2D");
int is1D; /* current line is 1d/2d-encoded */
(void) s;
CACHE_STATE(tif, sp);
while ((long)occ > 0) {
a0 = 0;
RunLength = 0;
pa = thisrun = sp->curruns;
#ifdef FAX3_DEBUG
printf("\nBitAcc=%08X, BitsAvail = %d EOLcnt = %d",
BitAcc, BitsAvail, EOLcnt);
#endif
SYNC_EOL(EOF2D);
NeedBits8(1, EOF2D);
is1D = GetBits(1); /* 1D/2D-encoding tag bit */
ClrBits(1);
#ifdef FAX3_DEBUG
printf(" %s\n-------------------- %d\n",
is1D ? "1D" : "2D", tif->tif_row);
fflush(stdout);
#endif
pb = sp->refruns;
b1 = *pb++;
if (is1D)
EXPAND1D(EOF2Da);
else
EXPAND2D(EOF2Da);
(*sp->fill)(buf, thisrun, pa, lastx);
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_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
/*
* Setup G3/G4-related compression/decompression state
* before data is processed. This routine is called once
* per image -- it sets up different state based on whether
* or not decoding or encoding is being done and whether
* 1D- or 2D-encoded data is involved.
*/
static int
Fax3SetupState(TIFF* tif)
{
TIFFDirectory* td = &tif->tif_dir;
Fax3BaseState* sp = Fax3State(tif);
int needsRefLine;
Fax3CodecState* dsp = (Fax3CodecState*) Fax3State(tif);
uint32 rowbytes, rowpixels, nruns;
if (td->td_bitspersample != 1) {
TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
"Bits/sample must be 1 for Group 3/4 encoding/decoding");
return (0);
}
/*
* Calculate the scanline/tile widths.
*/
if (isTiled(tif)) {
rowbytes = TIFFTileRowSize(tif);
rowpixels = td->td_tilewidth;
} else {
rowbytes = TIFFScanlineSize(tif);
rowpixels = td->td_imagewidth;
}
sp->rowbytes = (uint32) rowbytes;
sp->rowpixels = (uint32) rowpixels;
/*
* Allocate any additional space required for decoding/encoding.
*/
needsRefLine = (
(sp->groupoptions & GROUP3OPT_2DENCODING) ||
td->td_compression == COMPRESSION_CCITTFAX4
);
/*
Assure that allocation computations do not overflow.
TIFFroundup and TIFFSafeMultiply return zero on integer overflow
*/
dsp->runs=(uint32*) NULL;
nruns = TIFFroundup(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);
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, "Fax3SetupState",
"%s: No space for Group 3/4 reference line",
tif->tif_name);
return (0);
}
} else /* 1d encoding */
EncoderState(tif)->refline = NULL;
return (1);
}
/*
* CCITT Group 3 FAX Encoding.
*/
#define Fax3FlushBits(tif, sp) { \
if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
(void) TIFFFlushData1(tif); \
*(tif)->tif_rawcp++ = (tidataval_t) (sp)->data; \
(tif)->tif_rawcc++; \
(sp)->data = 0, (sp)->bit = 8; \
}
#define _FlushBits(tif) { \
if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
(void) TIFFFlushData1(tif); \
*(tif)->tif_rawcp++ = (tidataval_t) data; \
(tif)->tif_rawcc++; \
data = 0, bit = 8; \
}
static const int _msbmask[9] =
{ 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff };
#define _PutBits(tif, bits, length) { \
while (length > bit) { \
data |= bits >> (length - bit); \
length -= bit; \
_FlushBits(tif); \
} \
data |= (bits & _msbmask[length]) << (bit - length); \
bit -= length; \
if (bit == 0) \
_FlushBits(tif); \
}
/*
* Write a variable-length bit-value to
* the output stream. Values are
* assumed to be at most 16 bits.
*/
static void
Fax3PutBits(TIFF* tif, unsigned int bits, unsigned int length)
{
Fax3CodecState* sp = EncoderState(tif);
unsigned int bit = sp->bit;
int data = sp->data;
_PutBits(tif, bits, length);
sp->data = data;
sp->bit = bit;
}
/*
* Write a code to the output stream.
*/
#define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length)
#ifdef FAX3_DEBUG
#define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B")
#define DEBUG_PRINT(what,len) { \
int t; \
printf("%08X/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), len); \
for (t = length-1; t >= 0; t--) \
putchar(code & (1<<t) ? '1' : '0'); \
putchar('\n'); \
}
#endif
/*
* Write the sequence of codes that describes
* the specified span of zero's or one's. The
* appropriate table that holds the make-up and
* terminating codes is supplied.
*/
static void
putspan(TIFF* tif, int32 span, const tableentry* tab)
{
Fax3CodecState* sp = EncoderState(tif);
unsigned int bit = sp->bit;
int data = sp->data;
unsigned int code, length;
while (span >= 2624) {
const tableentry* te = &tab[63 + (2560>>6)];
code = te->code, length = te->length;
#ifdef FAX3_DEBUG
DEBUG_PRINT("MakeUp", te->runlen);
#endif
_PutBits(tif, code, length);
span -= te->runlen;
}
if (span >= 64) {
const tableentry* te = &tab[63 + (span>>6)];
assert(te->runlen == 64*(span>>6));
code = te->code, length = te->length;
#ifdef FAX3_DEBUG
DEBUG_PRINT("MakeUp", te->runlen);
#endif
_PutBits(tif, code, length);
span -= te->runlen;
}
code = tab[span].code, length = tab[span].length;
#ifdef FAX3_DEBUG
DEBUG_PRINT(" Term", tab[span].runlen);
#endif
_PutBits(tif, code, length);
sp->data = data;
sp->bit = bit;
}
/*
* Write an EOL code to the output stream. The zero-fill
* logic for byte-aligning encoded scanlines is handled
* here. We also handle writing the tag bit for the next
* scanline when doing 2d encoding.
*/
static void
Fax3PutEOL(TIFF* tif)
{
Fax3CodecState* sp = EncoderState(tif);
unsigned int bit = sp->bit;
int data = sp->data;
unsigned int code, length, tparm;
if (sp->b.groupoptions & GROUP3OPT_FILLBITS) {
/*
* Force bit alignment so EOL will terminate on
* a byte boundary. That is, force the bit alignment
* to 16-12 = 4 before putting out the EOL code.
*/
int align = 8 - 4;
if (align != sp->bit) {
if (align > sp->bit)
align = sp->bit + (8 - align);
else
align = sp->bit - align;
code = 0;
tparm=align;
_PutBits(tif, 0, tparm);
}
}
code = EOL, length = 12;
if (is2DEncoding(sp))
code = (code<<1) | (sp->tag == G3_1D), length++;
_PutBits(tif, code, length);
sp->data = data;
sp->bit = bit;
}
/*
* Reset encoding state at the start of a strip.
*/
static int
Fax3PreEncode(TIFF* tif, tsample_t s)
{
Fax3CodecState* sp = EncoderState(tif);
(void) s;
assert(sp != NULL);
sp->bit = 8;
sp->data = 0;
sp->tag = G3_1D;
/*
* This is necessary for Group 4; otherwise it isn't
* needed because the first scanline of each strip ends
* up being copied into the refline.
*/
if (sp->refline)
_TIFFmemset(sp->refline, 0x00, sp->b.rowbytes);
if (is2DEncoding(sp)) {
float res = tif->tif_dir.td_yresolution;
/*
* The CCITT spec says that when doing 2d encoding, you
* should only do it on K consecutive scanlines, where K
* depends on the resolution of the image being encoded
* (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory
* code initializes td_yresolution to 0, this code will
* select a K of 2 unless the YResolution tag is set
* appropriately. (Note also that we fudge a little here
* and use 150 lpi to avoid problems with units conversion.)
*/
if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER)
res *= 2.54f; /* convert to inches */
sp->maxk = (res > 150 ? 4 : 2);
sp->k = sp->maxk-1;
} else
sp->k = sp->maxk = 0;
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.
*/
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);
}
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);