static int
PredictorSetup(TIFF* tif)
{
TIFFPredictorState* sp = PredictorState(tif);
TIFFDirectory* td = &tif->tif_dir;
if (sp->predictor == 1) /* no differencing */
return (1);
if (sp->predictor != 2) {
TIFFError(tif->tif_name, "\"Predictor\" value %d not supported",
sp->predictor);
return (0);
}
if (td->td_bitspersample != 8 && td->td_bitspersample != 16) {
TIFFError(tif->tif_name,
"Horizontal differencing \"Predictor\" not supported with %d-bit samples",
td->td_bitspersample);
return (0);
}
sp->stride = (td->td_planarconfig == PLANARCONFIG_CONTIG ?
td->td_samplesperpixel : 1);
/*
* Calculate the scanline/tile-width size in bytes.
*/
if (isTiled(tif))
sp->rowsize = TIFFTileRowSize(tif);
else
sp->rowsize = TIFFScanlineSize(tif);
return (1);
}
static int
PredictorSetupEncode(TIFF* tif)
{
TIFFPredictorState* sp = PredictorState(tif);
TIFFDirectory* td = &tif->tif_dir;
if (!(*sp->setupencode)(tif) || !PredictorSetup(tif))
return (0);
if (sp->predictor == 2) {
switch (td->td_bitspersample) {
case 8: sp->pfunc = horDiff8; break;
case 16: sp->pfunc = horDiff16; break;
}
/*
* Override default encoding method with
* one that does the predictor stuff.
*/
sp->coderow = tif->tif_encoderow;
tif->tif_encoderow = PredictorEncodeRow;
sp->codestrip = tif->tif_encodestrip;
tif->tif_encodestrip = PredictorEncodeTile;
sp->codetile = tif->tif_encodetile;
tif->tif_encodetile = PredictorEncodeTile;
}
return (1);
}
static int
PredictorSetup(TIFF* tif)
{
static const char module[] = "PredictorSetup";
TIFFPredictorState* sp = PredictorState(tif);
TIFFDirectory* td = &tif->tif_dir;
switch (sp->predictor) /* no differencing */
{
case PREDICTOR_NONE:
return 1;
case PREDICTOR_HORIZONTAL:
if (td->td_bitspersample != 8
&& td->td_bitspersample != 16
&& td->td_bitspersample != 32) {
TIFFErrorExt(tif->tif_clientdata, module,
"Horizontal differencing \"Predictor\" not supported with %d-bit samples",
td->td_bitspersample);
return 0;
}
break;
case PREDICTOR_FLOATINGPOINT:
if (td->td_sampleformat != SAMPLEFORMAT_IEEEFP) {
TIFFErrorExt(tif->tif_clientdata, module,
"Floating point \"Predictor\" not supported with %d data format",
td->td_sampleformat);
return 0;
}
if (td->td_bitspersample != 16
&& td->td_bitspersample != 24
&& td->td_bitspersample != 32
&& td->td_bitspersample != 64) { /* Should 64 be allowed? */
TIFFErrorExt(tif->tif_clientdata, module,
"Floating point \"Predictor\" not supported with %d-bit samples",
td->td_bitspersample);
return 0;
}
break;
default:
TIFFErrorExt(tif->tif_clientdata, module,
"\"Predictor\" value %d not supported",
sp->predictor);
return 0;
}
sp->stride = (td->td_planarconfig == PLANARCONFIG_CONTIG ?
td->td_samplesperpixel : 1);
/*
* Calculate the scanline/tile-width size in bytes.
*/
if (isTiled(tif))
sp->rowsize = TIFFTileRowSize(tif);
else
sp->rowsize = TIFFScanlineSize(tif);
if (sp->rowsize == 0)
return 0;
return 1;
}
TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW
static int
horAcc8(TIFF* tif, uint8* cp0, tmsize_t cc)
{
tmsize_t stride = PredictorState(tif)->stride;
unsigned char* cp = (unsigned char*) cp0;
if((cc%stride)!=0)
{
TIFFErrorExt(tif->tif_clientdata, "horAcc8",
"%s", "(cc%stride)!=0");
return 0;
}
if (cc > stride) {
/*
* Pipeline the most common cases.
*/
if (stride == 3) {
unsigned int cr = cp[0];
unsigned int cg = cp[1];
unsigned int cb = cp[2];
cc -= 3;
cp += 3;
while (cc>0) {
cp[0] = (unsigned char) ((cr += cp[0]) & 0xff);
cp[1] = (unsigned char) ((cg += cp[1]) & 0xff);
cp[2] = (unsigned char) ((cb += cp[2]) & 0xff);
cc -= 3;
cp += 3;
}
} else if (stride == 4) {
unsigned int cr = cp[0];
unsigned int cg = cp[1];
unsigned int cb = cp[2];
unsigned int ca = cp[3];
cc -= 4;
cp += 4;
while (cc>0) {
cp[0] = (unsigned char) ((cr += cp[0]) & 0xff);
cp[1] = (unsigned char) ((cg += cp[1]) & 0xff);
cp[2] = (unsigned char) ((cb += cp[2]) & 0xff);
cp[3] = (unsigned char) ((ca += cp[3]) & 0xff);
cc -= 4;
cp += 4;
}
} else {
cc -= stride;
do {
REPEAT4(stride, cp[stride] =
(unsigned char) ((cp[stride] + *cp) & 0xff); cp++)
cc -= stride;
} while (cc>0);
}
}
return 1;
}
static void
horAcc8(TIFF* tif, uint8* cp0, tmsize_t cc)
{
tmsize_t stride = PredictorState(tif)->stride;
char* cp = (char*) cp0;
assert((cc%stride)==0);
if (cc > stride) {
/*
* Pipeline the most common cases.
*/
if (stride == 3) {
unsigned int cr = cp[0];
unsigned int cg = cp[1];
unsigned int cb = cp[2];
cc -= 3;
cp += 3;
while (cc>0) {
cp[0] = (char) (cr += cp[0]);
cp[1] = (char) (cg += cp[1]);
cp[2] = (char) (cb += cp[2]);
cc -= 3;
cp += 3;
}
} else if (stride == 4) {
unsigned int cr = cp[0];
unsigned int cg = cp[1];
unsigned int cb = cp[2];
unsigned int ca = cp[3];
cc -= 4;
cp += 4;
while (cc>0) {
cp[0] = (char) (cr += cp[0]);
cp[1] = (char) (cg += cp[1]);
cp[2] = (char) (cb += cp[2]);
cp[3] = (char) (ca += cp[3]);
cc -= 4;
cp += 4;
}
} else {
cc -= stride;
do {
REPEAT4(stride, cp[stride] =
(char) (cp[stride] + *cp); cp++)
cc -= stride;
} while (cc>0);
}
}
}
static void
horAcc16(TIFF* tif, uint8* cp0, tmsize_t cc)
{
tmsize_t stride = PredictorState(tif)->stride;
uint16* wp = (uint16*) cp0;
tmsize_t wc = cc / 2;
assert((cc%(2*stride))==0);
if (wc > stride) {
wc -= stride;
do {
REPEAT4(stride, wp[stride] = (uint16)(((unsigned int)wp[stride] + (unsigned int)wp[0]) & 0xffff); wp++)
wc -= stride;
} while (wc > 0);
}
static void
swabHorAcc16(TIFF* tif, uint8* cp0, tmsize_t cc)
{
tmsize_t stride = PredictorState(tif)->stride;
uint16* wp = (uint16*) cp0;
tmsize_t wc = cc / 2;
assert((cc%(2*stride))==0);
if (wc > stride) {
TIFFSwabArrayOfShort(wp, wc);
wc -= stride;
do {
REPEAT4(stride, wp[stride] += wp[0]; wp++)
wc -= stride;
} while (wc > 0);
}
static int
PredictorSetupDecode(TIFF* tif) {
TIFFPredictorState* sp = PredictorState(tif);
TIFFDirectory* td = &tif->tif_dir;
if (!(*sp->setupdecode)(tif) || !PredictorSetup(tif)) {
return (0);
}
if (sp->predictor == 2) {
switch (td->td_bitspersample) {
case 8:
sp->pfunc = horAcc8;
break;
case 16:
sp->pfunc = horAcc16;
break;
}
/*
* Override default decoding method with
* one that does the predictor stuff.
*/
sp->coderow = tif->tif_decoderow;
tif->tif_decoderow = PredictorDecodeRow;
sp->codestrip = tif->tif_decodestrip;
tif->tif_decodestrip = PredictorDecodeTile;
sp->codetile = tif->tif_decodetile;
tif->tif_decodetile = PredictorDecodeTile;
/*
* If the data is horizontally differenced
* 16-bit data that requires byte-swapping,
* then it must be byte swapped before the
* accumulation step. We do this with a
* special-purpose routine and override the
* normal post decoding logic that the library
* setup when the directory was read.
*/
if (tif->tif_flags & TIFF_SWAB) {
if (sp->pfunc == horAcc16) {
sp->pfunc = swabHorAcc16;
tif->tif_postdecode = _TIFFNoPostDecode;
} /* else handle 32-bit case... */
}
}
return (1);
}
static void
horAcc8(TIFF* tif, tidata_t cp0, tsize_t cc)
{
TIFFPredictorState* sp = PredictorState(tif);
tsize_t stride = sp->stride;
char* cp = (char*) cp0;
if (cc > stride) {
cc -= stride;
/*
* Pipeline the most common cases.
*/
if (stride == 3) {
u_int cr = cp[0];
u_int cg = cp[1];
u_int cb = cp[2];
do {
cc -= 3, cp += 3;
cp[0] = (cr += cp[0]);
cp[1] = (cg += cp[1]);
cp[2] = (cb += cp[2]);
} while ((int32) cc > 0);
} else if (stride == 4) {
u_int cr = cp[0];
u_int cg = cp[1];
u_int cb = cp[2];
u_int ca = cp[3];
do {
cc -= 4, cp += 4;
cp[0] = (cr += cp[0]);
cp[1] = (cg += cp[1]);
cp[2] = (cb += cp[2]);
cp[3] = (ca += cp[3]);
} while ((int32) cc > 0);
} else {
do {
REPEAT4(stride, cp[stride] += *cp; cp++)
cc -= stride;
} while ((int32) cc > 0);
}
}
TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW
static int
horAcc16(TIFF* tif, uint8* cp0, tmsize_t cc)
{
tmsize_t stride = PredictorState(tif)->stride;
uint16* wp = (uint16*) cp0;
tmsize_t wc = cc / 2;
if((cc%(2*stride))!=0)
{
TIFFErrorExt(tif->tif_clientdata, "horAcc16",
"%s", "cc%(2*stride))!=0");
return 0;
}
if (wc > stride) {
wc -= stride;
do {
REPEAT4(stride, wp[stride] = (uint16)(((unsigned int)wp[stride] + (unsigned int)wp[0]) & 0xffff); wp++)
wc -= stride;
} while (wc > 0);
}
static int
PredictorSetupDecode(TIFF* tif)
{
TIFFPredictorState* sp = PredictorState(tif);
TIFFDirectory* td = &tif->tif_dir;
if (!(*sp->setupdecode)(tif) || !PredictorSetup(tif))
return 0;
if (sp->predictor == 2) {
switch (td->td_bitspersample) {
case 8: sp->pfunc = horAcc8; break;
case 16: sp->pfunc = horAcc16; break;
}
/*
* Override default decoding method with one that does the
* predictor stuff.
*/
sp->coderow = tif->tif_decoderow;
tif->tif_decoderow = PredictorDecodeRow;
sp->codestrip = tif->tif_decodestrip;
tif->tif_decodestrip = PredictorDecodeTile;
sp->codetile = tif->tif_decodetile;
tif->tif_decodetile = PredictorDecodeTile;
/*
* If the data is horizontally differenced 16-bit data that
* requires byte-swapping, then it must be byte swapped before
* the accumulation step. We do this with a special-purpose
* routine and override the normal post decoding logic that
* the library setup when the directory was read.
*/
if (tif->tif_flags & TIFF_SWAB) {
if (sp->pfunc == horAcc16) {
sp->pfunc = swabHorAcc16;
tif->tif_postdecode = _TIFFNoPostDecode;
} /* else handle 32-bit case... */
}
}
else if (sp->predictor == 3) {
sp->pfunc = fpAcc;
/*
* Override default decoding method with one that does the
* predictor stuff.
*/
sp->coderow = tif->tif_decoderow;
tif->tif_decoderow = PredictorDecodeRow;
sp->codestrip = tif->tif_decodestrip;
tif->tif_decodestrip = PredictorDecodeTile;
sp->codetile = tif->tif_decodetile;
tif->tif_decodetile = PredictorDecodeTile;
/*
* The data should not be swapped outside of the floating
* point predictor, the accumulation routine should return
* byres in the native order.
*/
if (tif->tif_flags & TIFF_SWAB) {
tif->tif_postdecode = _TIFFNoPostDecode;
}
/*
* Allocate buffer to keep the decoded bytes before
* rearranging in the ight order
*/
}
return 1;
}
static int
PredictorSetupEncode(TIFF* tif)
{
TIFFPredictorState* sp = PredictorState(tif);
TIFFDirectory* td = &tif->tif_dir;
if (!(*sp->setupencode)(tif) || !PredictorSetup(tif))
return 0;
if (sp->predictor == 2) {
switch (td->td_bitspersample) {
case 8: sp->encodepfunc = horDiff8; break;
case 16: sp->encodepfunc = horDiff16; break;
case 32: sp->encodepfunc = horDiff32; break;
}
/*
* Override default encoding method with one that does the
* predictor stuff.
*/
if( tif->tif_encoderow != PredictorEncodeRow )
{
sp->encoderow = tif->tif_encoderow;
tif->tif_encoderow = PredictorEncodeRow;
sp->encodestrip = tif->tif_encodestrip;
tif->tif_encodestrip = PredictorEncodeTile;
sp->encodetile = tif->tif_encodetile;
tif->tif_encodetile = PredictorEncodeTile;
}
/*
* If the data is horizontally differenced 16-bit data that
* requires byte-swapping, then it must be byte swapped after
* the differentiation step. We do this with a special-purpose
* routine and override the normal post decoding logic that
* the library setup when the directory was read.
*/
if (tif->tif_flags & TIFF_SWAB) {
if (sp->encodepfunc == horDiff16) {
sp->encodepfunc = swabHorDiff16;
tif->tif_postdecode = _TIFFNoPostDecode;
} else if (sp->encodepfunc == horDiff32) {
sp->encodepfunc = swabHorDiff32;
tif->tif_postdecode = _TIFFNoPostDecode;
}
}
}
else if (sp->predictor == 3) {
sp->encodepfunc = fpDiff;
/*
* Override default encoding method with one that does the
* predictor stuff.
*/
if( tif->tif_encoderow != PredictorEncodeRow )
{
sp->encoderow = tif->tif_encoderow;
tif->tif_encoderow = PredictorEncodeRow;
sp->encodestrip = tif->tif_encodestrip;
tif->tif_encodestrip = PredictorEncodeTile;
sp->encodetile = tif->tif_encodetile;
tif->tif_encodetile = PredictorEncodeTile;
}
}
return 1;
}