tif_predict.c File Reference

#include "tif_predict.h"
#include "tiffiop.h"

Include dependency graph for tif_predict.c:

Go to the source code of this file.

Macros
#define	PredictorState(tif)   ((TIFFPredictorState *)(tif)->tif_data)
#define	REPEAT4(n, op)
#define	OP
#define	FIELD_PREDICTOR   (FIELD_CODEC + 0) /* XXX */

Functions
static int	horAcc8 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	horAcc16 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	horAcc32 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	horAcc64 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	swabHorAcc16 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	swabHorAcc32 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	swabHorAcc64 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	horDiff8 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	horDiff16 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	horDiff32 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	horDiff64 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	swabHorDiff16 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	swabHorDiff32 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	swabHorDiff64 (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	fpAcc (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	fpDiff (TIFF *tif, uint8_t *cp0, tmsize_t cc)
static int	PredictorDecodeRow (TIFF *tif, uint8_t *op0, tmsize_t occ0, uint16_t s)
static int	PredictorDecodeTile (TIFF *tif, uint8_t *op0, tmsize_t occ0, uint16_t s)
static int	PredictorEncodeRow (TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
static int	PredictorEncodeTile (TIFF *tif, uint8_t *bp0, tmsize_t cc0, uint16_t s)
static int	PredictorSetup (TIFF *tif)
static int	PredictorSetupDecode (TIFF *tif)
static int	PredictorSetupEncode (TIFF *tif)
static int	PredictorVSetField (TIFF *tif, uint32_t tag, va_list ap)
static int	PredictorVGetField (TIFF *tif, uint32_t tag, va_list ap)
static void	PredictorPrintDir (TIFF *tif, FILE *fd, long flags)
int	TIFFPredictorInit (TIFF *tif)
int	TIFFPredictorCleanup (TIFF *tif)

Variables
static const TIFFField	predictFields []

Macro Definition Documentation

FIELD_PREDICTOR

#define FIELD_PREDICTOR   (FIELD_CODEC + 0) /* XXX */

Definition at line 1037 of file tif_predict.c.

OP

#define OP

Value:

    do                                                                         \
    {                                                                          \
        cp[1] = (uint8_t)((cp[1] + cp[0]) & 0xff);                             \
        ++cp;                                                                  \
    } while (0)

PredictorState

#define PredictorState

(

tif

)

((TIFFPredictorState *)(tif)->tif_data)

Definition at line 37 of file tif_predict.c.

REPEAT4

#define REPEAT4	(		n,
			op
	)

Value:

    switch (n)                                                                 \
    {                                                                          \
        default:                                                               \
        {                                                                      \
            tmsize_t i;                                                        \
            for (i = n - 4; i > 0; i--)                                        \
            {                                                                  \
                op;                                                            \
            }                                                                  \
        } /*-fallthrough*/                                                     \
        case 4:                                                                \
            op; /*-fallthrough*/                                               \
        case 3:                                                                \
            op; /*-fallthrough*/                                               \
        case 2:                                                                \
            op; /*-fallthrough*/                                               \
        case 1:                                                                \
            op; /*-fallthrough*/                                               \
        case 0:;                                                               \
    }

Definition at line 322 of file tif_predict.c.

Function Documentation

fpAcc()

static int fpAcc ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 534 of file tif_predict.c.

{
    tmsize_t stride = PredictorState(tif)->stride;
    uint32_t bps = tif->tif_dir.td_bitspersample / 8;
    tmsize_t wc = cc / bps;
    tmsize_t count = cc;
    uint8_t *cp = cp0;
    uint8_t *tmp;
 
    if (cc % (bps * stride) != 0)
    {
        TIFFErrorExtR(tif, "fpAcc", "%s", "cc%(bps*stride))!=0");
        return 0;
    }
 
    tmp = (uint8_t *)_TIFFmallocExt(tif, cc);
    if (!tmp)
        return 0;
 
    if (stride == 1)
    {
        /* Optimization of general case */
#define OP                                                                     \
    do                                                                         \
    {                                                                          \
        cp[1] = (uint8_t)((cp[1] + cp[0]) & 0xff);                             \
        ++cp;                                                                  \
    } while (0)
        for (; count > 8; count -= 8)
        {
            OP;
            OP;
            OP;
            OP;
            OP;
            OP;
            OP;
            OP;
        }
        for (; count > 1; count -= 1)
        {
            OP;
        }
#undef OP
    }
    else
    {
        while (count > stride)
        {
            REPEAT4(stride, cp[stride] = (uint8_t)((cp[stride] + cp[0]) & 0xff);
                    cp++)
            count -= stride;
        }
    }
 
    _TIFFmemcpy(tmp, cp0, cc);
    cp = (uint8_t *)cp0;
    count = 0;
 
#if (defined(__x86_64__) || defined(_M_X64)) && !defined(__arm64ec__)
    if (bps == 4)
    {
        /* Optimization of general case */
        for (; count + 15 < wc; count += 16)
        {
            /* Interlace 4*16 byte values */
 
            __m128i xmm0 =
                _mm_loadu_si128((const __m128i *)(tmp + count + 3 * wc));
            __m128i xmm1 =
                _mm_loadu_si128((const __m128i *)(tmp + count + 2 * wc));
            __m128i xmm2 =
                _mm_loadu_si128((const __m128i *)(tmp + count + 1 * wc));
            __m128i xmm3 =
                _mm_loadu_si128((const __m128i *)(tmp + count + 0 * wc));
            /* (xmm0_0, xmm1_0, xmm0_1, xmm1_1, xmm0_2, xmm1_2, ...) */
            __m128i tmp0 = _mm_unpacklo_epi8(xmm0, xmm1);
            /* (xmm0_8, xmm1_8, xmm0_9, xmm1_9, xmm0_10, xmm1_10, ...) */
            __m128i tmp1 = _mm_unpackhi_epi8(xmm0, xmm1);
            /* (xmm2_0, xmm3_0, xmm2_1, xmm3_1, xmm2_2, xmm3_2, ...) */
            __m128i tmp2 = _mm_unpacklo_epi8(xmm2, xmm3);
            /* (xmm2_8, xmm3_8, xmm2_9, xmm3_9, xmm2_10, xmm3_10, ...) */
            __m128i tmp3 = _mm_unpackhi_epi8(xmm2, xmm3);
            /* (xmm0_0, xmm1_0, xmm2_0, xmm3_0, xmm0_1, xmm1_1, xmm2_1, xmm3_1,
             * ...) */
            __m128i tmp2_0 = _mm_unpacklo_epi16(tmp0, tmp2);
            __m128i tmp2_1 = _mm_unpackhi_epi16(tmp0, tmp2);
            __m128i tmp2_2 = _mm_unpacklo_epi16(tmp1, tmp3);
            __m128i tmp2_3 = _mm_unpackhi_epi16(tmp1, tmp3);
            _mm_storeu_si128((__m128i *)(cp + 4 * count + 0 * 16), tmp2_0);
            _mm_storeu_si128((__m128i *)(cp + 4 * count + 1 * 16), tmp2_1);
            _mm_storeu_si128((__m128i *)(cp + 4 * count + 2 * 16), tmp2_2);
            _mm_storeu_si128((__m128i *)(cp + 4 * count + 3 * 16), tmp2_3);
        }
    }
#endif
 
    for (; count < wc; count++)
    {
        uint32_t byte;
        for (byte = 0; byte < bps; byte++)
        {
#if WORDS_BIGENDIAN
            cp[bps * count + byte] = tmp[byte * wc + count];
#else
            cp[bps * count + byte] = tmp[(bps - byte - 1) * wc + count];
#endif
        }
    }
    _TIFFfreeExt(tif, tmp);
    return 1;
}

Referenced by PredictorSetupDecode().

fpDiff()

static TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW int fpDiff ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 908 of file tif_predict.c.

{
    tmsize_t stride = PredictorState(tif)->stride;
    uint32_t bps = tif->tif_dir.td_bitspersample / 8;
    tmsize_t wc = cc / bps;
    tmsize_t count;
    uint8_t *cp = (uint8_t *)cp0;
    uint8_t *tmp;
 
    if ((cc % (bps * stride)) != 0)
    {
        TIFFErrorExtR(tif, "fpDiff", "%s", "(cc%(bps*stride))!=0");
        return 0;
    }
 
    tmp = (uint8_t *)_TIFFmallocExt(tif, cc);
    if (!tmp)
        return 0;
 
    _TIFFmemcpy(tmp, cp0, cc);
    for (count = 0; count < wc; count++)
    {
        uint32_t byte;
        for (byte = 0; byte < bps; byte++)
        {
#if WORDS_BIGENDIAN
            cp[byte * wc + count] = tmp[bps * count + byte];
#else
            cp[(bps - byte - 1) * wc + count] = tmp[bps * count + byte];
#endif
        }
    }
    _TIFFfreeExt(tif, tmp);
 
    cp = (uint8_t *)cp0;
    cp += cc - stride - 1;
    for (count = cc; count > stride; count -= stride)
        REPEAT4(stride,
                cp[stride] = (unsigned char)((cp[stride] - cp[0]) & 0xff);
                cp--)
    return 1;
}

Referenced by PredictorSetupEncode().

horAcc16()

static TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW int horAcc16 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 436 of file tif_predict.c.

{
    tmsize_t stride = PredictorState(tif)->stride;
    uint16_t *wp = (uint16_t *)cp0;
    tmsize_t wc = cc / 2;
 
    if ((cc % (2 * stride)) != 0)
    {
        TIFFErrorExtR(tif, "horAcc16", "%s", "cc%(2*stride))!=0");
        return 0;
    }
 
    if (wc > stride)
    {
        wc -= stride;
        do
        {
            REPEAT4(stride, wp[stride] = (uint16_t)(((unsigned int)wp[stride] +
                                                     (unsigned int)wp[0]) &
                                                    0xffff);
                    wp++)
            wc -= stride;
        } while (wc > 0);
    }
    return 1;
}

Referenced by PredictorSetupDecode(), and swabHorAcc16().

horAcc32()

static TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW int horAcc32 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 473 of file tif_predict.c.

{
    tmsize_t stride = PredictorState(tif)->stride;
    uint32_t *wp = (uint32_t *)cp0;
    tmsize_t wc = cc / 4;
 
    if ((cc % (4 * stride)) != 0)
    {
        TIFFErrorExtR(tif, "horAcc32", "%s", "cc%(4*stride))!=0");
        return 0;
    }
 
    if (wc > stride)
    {
        wc -= stride;
        do
        {
            REPEAT4(stride, wp[stride] += wp[0]; wp++)
            wc -= stride;
        } while (wc > 0);
    }
    return 1;
}

Referenced by PredictorSetupDecode(), and swabHorAcc32().

horAcc64()

static TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW int horAcc64 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 507 of file tif_predict.c.

{
    tmsize_t stride = PredictorState(tif)->stride;
    uint64_t *wp = (uint64_t *)cp0;
    tmsize_t wc = cc / 8;
 
    if ((cc % (8 * stride)) != 0)
    {
        TIFFErrorExtR(tif, "horAcc64", "%s", "cc%(8*stride))!=0");
        return 0;
    }
 
    if (wc > stride)
    {
        wc -= stride;
        do
        {
            REPEAT4(stride, wp[stride] += wp[0]; wp++)
            wc -= stride;
        } while (wc > 0);
    }
    return 1;
}

Referenced by PredictorSetupDecode(), and swabHorAcc64().

horAcc8()

static TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW int horAcc8 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 351 of file tif_predict.c.

{
    tmsize_t stride = PredictorState(tif)->stride;
 
    uint8_t *cp = cp0;
    if ((cc % stride) != 0)
    {
        TIFFErrorExtR(tif, "horAcc8", "%s", "(cc%stride)!=0");
        return 0;
    }
 
    if (cc > stride)
    {
        /*
         * Pipeline the most common cases.
         */
        if (stride == 1)
        {
            uint32_t acc = cp[0];
            tmsize_t i = stride;
            for (; i < cc - 3; i += 4)
            {
                cp[i + 0] = (uint8_t)((acc += cp[i + 0]) & 0xff);
                cp[i + 1] = (uint8_t)((acc += cp[i + 1]) & 0xff);
                cp[i + 2] = (uint8_t)((acc += cp[i + 2]) & 0xff);
                cp[i + 3] = (uint8_t)((acc += cp[i + 3]) & 0xff);
            }
            for (; i < cc; i++)
            {
                cp[i + 0] = (uint8_t)((acc += cp[i + 0]) & 0xff);
            }
        }
        else if (stride == 3)
        {
            uint32_t cr = cp[0];
            uint32_t cg = cp[1];
            uint32_t cb = cp[2];
            tmsize_t i = stride;
            for (; i < cc; i += stride)
            {
                cp[i + 0] = (uint8_t)((cr += cp[i + 0]) & 0xff);
                cp[i + 1] = (uint8_t)((cg += cp[i + 1]) & 0xff);
                cp[i + 2] = (uint8_t)((cb += cp[i + 2]) & 0xff);
            }
        }
        else if (stride == 4)
        {
            uint32_t cr = cp[0];
            uint32_t cg = cp[1];
            uint32_t cb = cp[2];
            uint32_t ca = cp[3];
            tmsize_t i = stride;
            for (; i < cc; i += stride)
            {
                cp[i + 0] = (uint8_t)((cr += cp[i + 0]) & 0xff);
                cp[i + 1] = (uint8_t)((cg += cp[i + 1]) & 0xff);
                cp[i + 2] = (uint8_t)((cb += cp[i + 2]) & 0xff);
                cp[i + 3] = (uint8_t)((ca += cp[i + 3]) & 0xff);
            }
        }
        else
        {
            cc -= stride;
            do
            {
                REPEAT4(stride,
                        cp[stride] = (uint8_t)((cp[stride] + *cp) & 0xff);
                        cp++)
                cc -= stride;
            } while (cc > 0);
        }
    }
    return 1;
}

Referenced by PredictorSetupDecode().

horDiff16()

static TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW int horDiff16 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 785 of file tif_predict.c.

{
    TIFFPredictorState *sp = PredictorState(tif);
    tmsize_t stride = sp->stride;
    uint16_t *wp = (uint16_t *)cp0;
    tmsize_t wc = cc / 2;
 
    if ((cc % (2 * stride)) != 0)
    {
        TIFFErrorExtR(tif, "horDiff8", "%s", "(cc%(2*stride))!=0");
        return 0;
    }
 
    if (wc > stride)
    {
        wc -= stride;
        wp += wc - 1;
        do
        {
            REPEAT4(stride, wp[stride] = (uint16_t)(((unsigned int)wp[stride] -
                                                     (unsigned int)wp[0]) &
                                                    0xffff);
                    wp--)
            wc -= stride;
        } while (wc > 0);
    }
    return 1;
}

Referenced by PredictorSetupEncode(), and swabHorDiff16().

horDiff32()

static TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW int horDiff32 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 827 of file tif_predict.c.

{
    TIFFPredictorState *sp = PredictorState(tif);
    tmsize_t stride = sp->stride;
    uint32_t *wp = (uint32_t *)cp0;
    tmsize_t wc = cc / 4;
 
    if ((cc % (4 * stride)) != 0)
    {
        TIFFErrorExtR(tif, "horDiff32", "%s", "(cc%(4*stride))!=0");
        return 0;
    }
 
    if (wc > stride)
    {
        wc -= stride;
        wp += wc - 1;
        do
        {
            REPEAT4(stride, wp[stride] -= wp[0]; wp--)
            wc -= stride;
        } while (wc > 0);
    }
    return 1;
}

Referenced by PredictorSetupEncode(), and swabHorDiff32().

horDiff64()

static TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW int horDiff64 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 866 of file tif_predict.c.

{
    TIFFPredictorState *sp = PredictorState(tif);
    tmsize_t stride = sp->stride;
    uint64_t *wp = (uint64_t *)cp0;
    tmsize_t wc = cc / 8;
 
    if ((cc % (8 * stride)) != 0)
    {
        TIFFErrorExtR(tif, "horDiff64", "%s", "(cc%(8*stride))!=0");
        return 0;
    }
 
    if (wc > stride)
    {
        wc -= stride;
        wp += wc - 1;
        do
        {
            REPEAT4(stride, wp[stride] -= wp[0]; wp--)
            wc -= stride;
        } while (wc > 0);
    }
    return 1;
}

Referenced by PredictorSetupEncode(), and swabHorDiff64().

horDiff8()

static TIFF_NOSANITIZE_UNSIGNED_INT_OVERFLOW int horDiff8 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 707 of file tif_predict.c.

{
    TIFFPredictorState *sp = PredictorState(tif);
    tmsize_t stride = sp->stride;
    unsigned char *cp = (unsigned char *)cp0;
 
    if ((cc % stride) != 0)
    {
        TIFFErrorExtR(tif, "horDiff8", "%s", "(cc%stride)!=0");
        return 0;
    }
 
    if (cc > stride)
    {
        cc -= stride;
        /*
         * Pipeline the most common cases.
         */
        if (stride == 3)
        {
            unsigned int r1, g1, b1;
            unsigned int r2 = cp[0];
            unsigned int g2 = cp[1];
            unsigned int b2 = cp[2];
            do
            {
                r1 = cp[3];
                cp[3] = (unsigned char)((r1 - r2) & 0xff);
                r2 = r1;
                g1 = cp[4];
                cp[4] = (unsigned char)((g1 - g2) & 0xff);
                g2 = g1;
                b1 = cp[5];
                cp[5] = (unsigned char)((b1 - b2) & 0xff);
                b2 = b1;
                cp += 3;
            } while ((cc -= 3) > 0);
        }
        else if (stride == 4)
        {
            unsigned int r1, g1, b1, a1;
            unsigned int r2 = cp[0];
            unsigned int g2 = cp[1];
            unsigned int b2 = cp[2];
            unsigned int a2 = cp[3];
            do
            {
                r1 = cp[4];
                cp[4] = (unsigned char)((r1 - r2) & 0xff);
                r2 = r1;
                g1 = cp[5];
                cp[5] = (unsigned char)((g1 - g2) & 0xff);
                g2 = g1;
                b1 = cp[6];
                cp[6] = (unsigned char)((b1 - b2) & 0xff);
                b2 = b1;
                a1 = cp[7];
                cp[7] = (unsigned char)((a1 - a2) & 0xff);
                a2 = a1;
                cp += 4;
            } while ((cc -= 4) > 0);
        }
        else
        {
            cp += cc - 1;
            do
            {
                REPEAT4(stride,
                        cp[stride] =
                            (unsigned char)((cp[stride] - cp[0]) & 0xff);
                        cp--)
            } while ((cc -= stride) > 0);
        }
    }
    return 1;
}

Referenced by PredictorSetupEncode().

PredictorDecodeRow()

static int PredictorDecodeRow ( TIFF *  tif, uint8_t *  op0, tmsize_t  occ0, uint16_t  s  )

static

Definition at line 650 of file tif_predict.c.

{
    TIFFPredictorState *sp = PredictorState(tif);
 
    assert(sp != NULL);
    assert(sp->decoderow != NULL);
    assert(sp->decodepfunc != NULL);
 
    if ((*sp->decoderow)(tif, op0, occ0, s))
    {
        return (*sp->decodepfunc)(tif, op0, occ0);
    }
    else
        return 0;
}

Referenced by PredictorSetupDecode().

PredictorDecodeTile()

static int PredictorDecodeTile ( TIFF *  tif, uint8_t *  op0, tmsize_t  occ0, uint16_t  s  )

static

Definition at line 674 of file tif_predict.c.

{
    TIFFPredictorState *sp = PredictorState(tif);
 
    assert(sp != NULL);
    assert(sp->decodetile != NULL);
 
    if ((*sp->decodetile)(tif, op0, occ0, s))
    {
        tmsize_t rowsize = sp->rowsize;
        assert(rowsize > 0);
        if ((occ0 % rowsize) != 0)
        {
            TIFFErrorExtR(tif, "PredictorDecodeTile", "%s",
                          "occ0%rowsize != 0");
            return 0;
        }
        assert(sp->decodepfunc != NULL);
        while (occ0 > 0)
        {
            if (!(*sp->decodepfunc)(tif, op0, rowsize))
                return 0;
            occ0 -= rowsize;
            op0 += rowsize;
        }
        return 1;
    }
    else
        return 0;
}

Referenced by PredictorSetupDecode().

PredictorEncodeRow()

static int PredictorEncodeRow ( TIFF *  tif, uint8_t *  bp, tmsize_t  cc, uint16_t  s  )

static

Definition at line 951 of file tif_predict.c.

{
    static const char module[] = "PredictorEncodeRow";
    TIFFPredictorState *sp = PredictorState(tif);
    uint8_t *working_copy;
    int result_code;
 
    assert(sp != NULL);
    assert(sp->encodepfunc != NULL);
    assert(sp->encoderow != NULL);
 
    /*
     * Do predictor manipulation in a working buffer to avoid altering
     * the callers buffer, like for PredictorEncodeTile().
     * https://gitlab.com/libtiff/libtiff/-/issues/5
     */
    working_copy = (uint8_t *)_TIFFmallocExt(tif, cc);
    if (working_copy == NULL)
    {
        TIFFErrorExtR(tif, module,
                      "Out of memory allocating %" PRId64 " byte temp buffer.",
                      (int64_t)cc);
        return 0;
    }
    memcpy(working_copy, bp, cc);
 
    if (!(*sp->encodepfunc)(tif, working_copy, cc))
    {
        _TIFFfreeExt(tif, working_copy);
        return 0;
    }
    result_code = (*sp->encoderow)(tif, working_copy, cc, s);
    _TIFFfreeExt(tif, working_copy);
    return result_code;
}

Referenced by PredictorSetupEncode().

PredictorEncodeTile()

static int PredictorEncodeTile ( TIFF *  tif, uint8_t *  bp0, tmsize_t  cc0, uint16_t  s  )

static

Definition at line 987 of file tif_predict.c.

{
    static const char module[] = "PredictorEncodeTile";
    TIFFPredictorState *sp = PredictorState(tif);
    uint8_t *working_copy;
    tmsize_t cc = cc0, rowsize;
    unsigned char *bp;
    int result_code;
 
    assert(sp != NULL);
    assert(sp->encodepfunc != NULL);
    assert(sp->encodetile != NULL);
 
    /*
     * Do predictor manipulation in a working buffer to avoid altering
     * the callers buffer. http://trac.osgeo.org/gdal/ticket/1965
     */
    working_copy = (uint8_t *)_TIFFmallocExt(tif, cc0);
    if (working_copy == NULL)
    {
        TIFFErrorExtR(tif, module,
                      "Out of memory allocating %" PRId64 " byte temp buffer.",
                      (int64_t)cc0);
        return 0;
    }
    memcpy(working_copy, bp0, cc0);
    bp = working_copy;
 
    rowsize = sp->rowsize;
    assert(rowsize > 0);
    if ((cc0 % rowsize) != 0)
    {
        TIFFErrorExtR(tif, "PredictorEncodeTile", "%s", "(cc0%rowsize)!=0");
        _TIFFfreeExt(tif, working_copy);
        return 0;
    }
    while (cc > 0)
    {
        (*sp->encodepfunc)(tif, bp, rowsize);
        cc -= rowsize;
        bp += rowsize;
    }
    result_code = (*sp->encodetile)(tif, working_copy, cc0, s);
 
    _TIFFfreeExt(tif, working_copy);
 
    return result_code;
}

Referenced by PredictorSetupEncode().

PredictorPrintDir()

static void PredictorPrintDir ( TIFF *  tif, FILE *  fd, long  flags  )

static

Definition at line 1082 of file tif_predict.c.

{
    TIFFPredictorState *sp = PredictorState(tif);
 
    (void)flags;
    if (TIFFFieldSet(tif, FIELD_PREDICTOR))
    {
        fprintf(fd, "  Predictor: ");
        switch (sp->predictor)
        {
            case 1:
                fprintf(fd, "none ");
                break;
            case 2:
                fprintf(fd, "horizontal differencing ");
                break;
            case 3:
                fprintf(fd, "floating point predictor ");
                break;
        }
        fprintf(fd, "%d (0x%x)\n", sp->predictor, sp->predictor);
    }
    if (sp->printdir)
        (*sp->printdir)(tif, fd, flags);
}

Referenced by TIFFPredictorInit().

PredictorSetup()

static int PredictorSetup ( TIFF *  tif )

static

Definition at line 63 of file tif_predict.c.

{
    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 && td->td_bitspersample != 64)
            {
                TIFFErrorExtR(tif, module,
                              "Horizontal differencing \"Predictor\" not "
                              "supported with %" PRIu16 "-bit samples",
                              td->td_bitspersample);
                return 0;
            }
            break;
        case PREDICTOR_FLOATINGPOINT:
            if (td->td_sampleformat != SAMPLEFORMAT_IEEEFP)
            {
                TIFFErrorExtR(
                    tif, module,
                    "Floating point \"Predictor\" not supported with %" PRIu16
                    " 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? */
                TIFFErrorExtR(
                    tif, module,
                    "Floating point \"Predictor\" not supported with %" PRIu16
                    "-bit samples",
                    td->td_bitspersample);
                return 0;
            }
            break;
        default:
            TIFFErrorExtR(tif, 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;
}

Referenced by PredictorSetupDecode(), and PredictorSetupEncode().

PredictorSetupDecode()

static int PredictorSetupDecode ( TIFF *  tif )

static

Definition at line 127 of file tif_predict.c.

{
    TIFFPredictorState *sp = PredictorState(tif);
    TIFFDirectory *td = &tif->tif_dir;
 
    /* Note: when PredictorSetup() fails, the effets of setupdecode() */
    /* will not be "canceled" so setupdecode() might be robust to */
    /* be called several times. */
    if (!(*sp->setupdecode)(tif) || !PredictorSetup(tif))
        return 0;
 
    if (sp->predictor == 2)
    {
        switch (td->td_bitspersample)
        {
            case 8:
                sp->decodepfunc = horAcc8;
                break;
            case 16:
                sp->decodepfunc = horAcc16;
                break;
            case 32:
                sp->decodepfunc = horAcc32;
                break;
            case 64:
                sp->decodepfunc = horAcc64;
                break;
        }
        /*
         * Override default decoding method with one that does the
         * predictor stuff.
         */
        if (tif->tif_decoderow != PredictorDecodeRow)
        {
            sp->decoderow = tif->tif_decoderow;
            tif->tif_decoderow = PredictorDecodeRow;
            sp->decodestrip = tif->tif_decodestrip;
            tif->tif_decodestrip = PredictorDecodeTile;
            sp->decodetile = 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->decodepfunc == horAcc16)
            {
                sp->decodepfunc = swabHorAcc16;
                tif->tif_postdecode = _TIFFNoPostDecode;
            }
            else if (sp->decodepfunc == horAcc32)
            {
                sp->decodepfunc = swabHorAcc32;
                tif->tif_postdecode = _TIFFNoPostDecode;
            }
            else if (sp->decodepfunc == horAcc64)
            {
                sp->decodepfunc = swabHorAcc64;
                tif->tif_postdecode = _TIFFNoPostDecode;
            }
        }
    }
 
    else if (sp->predictor == 3)
    {
        sp->decodepfunc = fpAcc;
        /*
         * Override default decoding method with one that does the
         * predictor stuff.
         */
        if (tif->tif_decoderow != PredictorDecodeRow)
        {
            sp->decoderow = tif->tif_decoderow;
            tif->tif_decoderow = PredictorDecodeRow;
            sp->decodestrip = tif->tif_decodestrip;
            tif->tif_decodestrip = PredictorDecodeTile;
            sp->decodetile = tif->tif_decodetile;
            tif->tif_decodetile = PredictorDecodeTile;
        }
        /*
         * The data should not be swapped outside of the floating
         * point predictor, the accumulation routine should return
         * bytes in the native order.
         */
        if (tif->tif_flags & TIFF_SWAB)
        {
            tif->tif_postdecode = _TIFFNoPostDecode;
        }
    }
 
    return 1;
}

Referenced by TIFFPredictorInit().

PredictorSetupEncode()

static int PredictorSetupEncode ( TIFF *  tif )

static

Definition at line 226 of file tif_predict.c.

{
    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;
            case 64:
                sp->encodepfunc = horDiff64;
                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->encodepfunc == horDiff64)
            {
                sp->encodepfunc = swabHorDiff64;
                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;
        }
        /*
         * The data should not be swapped outside of the floating
         * point predictor, the differentiation routine should return
         * bytes in the native order.
         */
        if (tif->tif_flags & TIFF_SWAB)
        {
            tif->tif_postdecode = _TIFFNoPostDecode;
        }
    }
 
    return 1;
}

Referenced by TIFFPredictorInit().

PredictorVGetField()

static int PredictorVGetField ( TIFF *  tif, uint32_t  tag, va_list  ap  )

static

Definition at line 1064 of file tif_predict.c.

{
    TIFFPredictorState *sp = PredictorState(tif);
 
    assert(sp != NULL);
    assert(sp->vgetparent != NULL);
 
    switch (tag)
    {
        case TIFFTAG_PREDICTOR:
            *va_arg(ap, uint16_t *) = (uint16_t)sp->predictor;
            break;
        default:
            return (*sp->vgetparent)(tif, tag, ap);
    }
    return 1;
}

Referenced by TIFFPredictorInit().

PredictorVSetField()

static int PredictorVSetField ( TIFF *  tif, uint32_t  tag, va_list  ap  )

static

Definition at line 1044 of file tif_predict.c.

{
    TIFFPredictorState *sp = PredictorState(tif);
 
    assert(sp != NULL);
    assert(sp->vsetparent != NULL);
 
    switch (tag)
    {
        case TIFFTAG_PREDICTOR:
            sp->predictor = (uint16_t)va_arg(ap, uint16_vap);
            TIFFSetFieldBit(tif, FIELD_PREDICTOR);
            break;
        default:
            return (*sp->vsetparent)(tif, tag, ap);
    }
    tif->tif_flags |= TIFF_DIRTYDIRECT;
    return 1;
}

Referenced by TIFFPredictorInit().

swabHorAcc16()

static int swabHorAcc16 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 426 of file tif_predict.c.

{
    uint16_t *wp = (uint16_t *)cp0;
    tmsize_t wc = cc / 2;
 
    TIFFSwabArrayOfShort(wp, wc);
    return horAcc16(tif, cp0, cc);
}

Referenced by PredictorSetupDecode().

swabHorAcc32()

static int swabHorAcc32 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 463 of file tif_predict.c.

{
    uint32_t *wp = (uint32_t *)cp0;
    tmsize_t wc = cc / 4;
 
    TIFFSwabArrayOfLong(wp, wc);
    return horAcc32(tif, cp0, cc);
}

Referenced by PredictorSetupDecode().

swabHorAcc64()

static int swabHorAcc64 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 497 of file tif_predict.c.

{
    uint64_t *wp = (uint64_t *)cp0;
    tmsize_t wc = cc / 8;
 
    TIFFSwabArrayOfLong8(wp, wc);
    return horAcc64(tif, cp0, cc);
}

Referenced by PredictorSetupDecode().

swabHorDiff16()

static int swabHorDiff16 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 814 of file tif_predict.c.

{
    uint16_t *wp = (uint16_t *)cp0;
    tmsize_t wc = cc / 2;
 
    if (!horDiff16(tif, cp0, cc))
        return 0;
 
    TIFFSwabArrayOfShort(wp, wc);
    return 1;
}

Referenced by PredictorSetupEncode().

swabHorDiff32()

static int swabHorDiff32 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 853 of file tif_predict.c.

{
    uint32_t *wp = (uint32_t *)cp0;
    tmsize_t wc = cc / 4;
 
    if (!horDiff32(tif, cp0, cc))
        return 0;
 
    TIFFSwabArrayOfLong(wp, wc);
    return 1;
}

Referenced by PredictorSetupEncode().

swabHorDiff64()

static int swabHorDiff64 ( TIFF *  tif, uint8_t *  cp0, tmsize_t  cc  )

static

Definition at line 892 of file tif_predict.c.

{
    uint64_t *wp = (uint64_t *)cp0;
    tmsize_t wc = cc / 8;
 
    if (!horDiff64(tif, cp0, cc))
        return 0;
 
    TIFFSwabArrayOfLong8(wp, wc);
    return 1;
}

Referenced by PredictorSetupEncode().

TIFFPredictorCleanup()

int TIFFPredictorCleanup

(

TIFF *

tif

)

Definition at line 1148 of file tif_predict.c.

{
    TIFFPredictorState *sp = PredictorState(tif);
 
    assert(sp != 0);
 
    tif->tif_tagmethods.vgetfield = sp->vgetparent;
    tif->tif_tagmethods.vsetfield = sp->vsetparent;
    tif->tif_tagmethods.printdir = sp->printdir;
    tif->tif_setupdecode = sp->setupdecode;
    tif->tif_setupencode = sp->setupencode;
 
    return 1;
}

TIFFPredictorInit()

int TIFFPredictorInit

(

TIFF *

tif

)

Definition at line 1108 of file tif_predict.c.

{
    TIFFPredictorState *sp = PredictorState(tif);
 
    assert(sp != 0);
 
    /*
     * Merge codec-specific tag information.
     */
    if (!_TIFFMergeFields(tif, predictFields, TIFFArrayCount(predictFields)))
    {
        TIFFErrorExtR(tif, "TIFFPredictorInit",
                      "Merging Predictor codec-specific tags failed");
        return 0;
    }
 
    /*
     * Override parent get/set field methods.
     */
    sp->vgetparent = tif->tif_tagmethods.vgetfield;
    tif->tif_tagmethods.vgetfield =
        PredictorVGetField; /* hook for predictor tag */
    sp->vsetparent = tif->tif_tagmethods.vsetfield;
    tif->tif_tagmethods.vsetfield =
        PredictorVSetField; /* hook for predictor tag */
    sp->printdir = tif->tif_tagmethods.printdir;
    tif->tif_tagmethods.printdir =
        PredictorPrintDir; /* hook for predictor tag */
 
    sp->setupdecode = tif->tif_setupdecode;
    tif->tif_setupdecode = PredictorSetupDecode;
    sp->setupencode = tif->tif_setupencode;
    tif->tif_setupencode = PredictorSetupEncode;
 
    sp->predictor = 1;      /* default value */
    sp->encodepfunc = NULL; /* no predictor routine */
    sp->decodepfunc = NULL; /* no predictor routine */
    return 1;
}

Variable Documentation

predictFields

const TIFFField predictFields[]

static

Initial value:

= {
    {TIFFTAG_PREDICTOR, 1, 1, TIFF_SHORT, 0, TIFF_SETGET_UINT16,
     FIELD_PREDICTOR, FALSE, FALSE, "Predictor", NULL},
}

Definition at line 1039 of file tif_predict.c.

Referenced by TIFFPredictorInit().