| /* |
| * Copyright (c) 1991-1997 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. |
| */ |
| |
| /* |
| * TIFF Library. |
| * |
| * Strip-organized Image Support Routines. |
| */ |
| #include "tiffiop.h" |
| |
| /* |
| * Compute which strip a (row,sample) value is in. |
| */ |
| uint32_t TIFFComputeStrip(TIFF *tif, uint32_t row, uint16_t sample) |
| { |
| static const char module[] = "TIFFComputeStrip"; |
| TIFFDirectory *td = &tif->tif_dir; |
| uint32_t strip; |
| |
| if (td->td_rowsperstrip == 0) |
| { |
| TIFFErrorExtR(tif, module, "Cannot compute strip: RowsPerStrip is zero"); |
| return 0; |
| } |
| strip = row / td->td_rowsperstrip; |
| if (td->td_planarconfig == PLANARCONFIG_SEPARATE) |
| { |
| if (sample >= td->td_samplesperpixel) |
| { |
| TIFFErrorExtR(tif, module, "%lu: Sample out of range, max %lu", |
| (unsigned long)sample, |
| (unsigned long)td->td_samplesperpixel); |
| return (0); |
| } |
| strip += (uint32_t)sample * td->td_stripsperimage; |
| } |
| return (strip); |
| } |
| |
| /* |
| * Compute how many strips are in an image. |
| */ |
| uint32_t TIFFNumberOfStrips(TIFF *tif) |
| { |
| TIFFDirectory *td = &tif->tif_dir; |
| uint32_t nstrips; |
| |
| if (td->td_rowsperstrip == 0) |
| { |
| TIFFWarningExtR(tif, "TIFFNumberOfStrips", "RowsPerStrip is zero"); |
| return 0; |
| } |
| nstrips = (td->td_rowsperstrip == (uint32_t)-1 |
| ? 1 |
| : TIFFhowmany_32(td->td_imagelength, td->td_rowsperstrip)); |
| if (td->td_planarconfig == PLANARCONFIG_SEPARATE) |
| nstrips = |
| _TIFFMultiply32(tif, nstrips, (uint32_t)td->td_samplesperpixel, |
| "TIFFNumberOfStrips"); |
| return (nstrips); |
| } |
| |
| /* |
| * Compute the # bytes in a variable height, row-aligned strip. |
| */ |
| uint64_t TIFFVStripSize64(TIFF *tif, uint32_t nrows) |
| { |
| static const char module[] = "TIFFVStripSize64"; |
| TIFFDirectory *td = &tif->tif_dir; |
| if (nrows == (uint32_t)(-1)) |
| nrows = td->td_imagelength; |
| if ((td->td_planarconfig == PLANARCONFIG_CONTIG) && |
| (td->td_photometric == PHOTOMETRIC_YCBCR) && (!isUpSampled(tif))) |
| { |
| /* |
| * Packed YCbCr data contain one Cb+Cr for every |
| * HorizontalSampling*VerticalSampling Y values. |
| * Must also roundup width and height when calculating |
| * since images that are not a multiple of the |
| * horizontal/vertical subsampling area include |
| * YCbCr data for the extended image. |
| */ |
| uint16_t ycbcrsubsampling[2]; |
| uint16_t samplingblock_samples; |
| uint32_t samplingblocks_hor; |
| uint32_t samplingblocks_ver; |
| uint64_t samplingrow_samples; |
| uint64_t samplingrow_size; |
| if (td->td_samplesperpixel != 3) |
| { |
| TIFFErrorExtR(tif, module, "Invalid td_samplesperpixel value"); |
| return 0; |
| } |
| TIFFGetFieldDefaulted(tif, TIFFTAG_YCBCRSUBSAMPLING, |
| ycbcrsubsampling + 0, ycbcrsubsampling + 1); |
| if ((ycbcrsubsampling[0] != 1 && ycbcrsubsampling[0] != 2 && |
| ycbcrsubsampling[0] != 4) || |
| (ycbcrsubsampling[1] != 1 && ycbcrsubsampling[1] != 2 && |
| ycbcrsubsampling[1] != 4) || |
| (ycbcrsubsampling[0] == 0 || ycbcrsubsampling[1] == 0)) |
| { |
| TIFFErrorExtR(tif, module, "Invalid YCbCr subsampling (%dx%d)", |
| ycbcrsubsampling[0], ycbcrsubsampling[1]); |
| return 0; |
| } |
| samplingblock_samples = ycbcrsubsampling[0] * ycbcrsubsampling[1] + 2; |
| samplingblocks_hor = |
| TIFFhowmany_32(td->td_imagewidth, ycbcrsubsampling[0]); |
| samplingblocks_ver = TIFFhowmany_32(nrows, ycbcrsubsampling[1]); |
| samplingrow_samples = _TIFFMultiply64(tif, samplingblocks_hor, |
| samplingblock_samples, module); |
| samplingrow_size = TIFFhowmany8_64(_TIFFMultiply64( |
| tif, samplingrow_samples, td->td_bitspersample, module)); |
| return ( |
| _TIFFMultiply64(tif, samplingrow_size, samplingblocks_ver, module)); |
| } |
| else |
| return (_TIFFMultiply64(tif, nrows, TIFFScanlineSize64(tif), module)); |
| } |
| tmsize_t TIFFVStripSize(TIFF *tif, uint32_t nrows) |
| { |
| static const char module[] = "TIFFVStripSize"; |
| uint64_t m; |
| m = TIFFVStripSize64(tif, nrows); |
| return _TIFFCastUInt64ToSSize(tif, m, module); |
| } |
| |
| /* |
| * Compute the # bytes in a raw strip. |
| */ |
| uint64_t TIFFRawStripSize64(TIFF *tif, uint32_t strip) |
| { |
| static const char module[] = "TIFFRawStripSize64"; |
| uint64_t bytecount = TIFFGetStrileByteCount(tif, strip); |
| |
| if (bytecount == 0) |
| { |
| TIFFErrorExtR(tif, module, |
| "%" PRIu64 ": Invalid strip byte count, strip %lu", |
| (uint64_t)bytecount, (unsigned long)strip); |
| bytecount = (uint64_t)-1; |
| } |
| |
| return bytecount; |
| } |
| tmsize_t TIFFRawStripSize(TIFF *tif, uint32_t strip) |
| { |
| static const char module[] = "TIFFRawStripSize"; |
| uint64_t m; |
| tmsize_t n; |
| m = TIFFRawStripSize64(tif, strip); |
| if (m == (uint64_t)(-1)) |
| n = (tmsize_t)(-1); |
| else |
| { |
| n = (tmsize_t)m; |
| if ((uint64_t)n != m) |
| { |
| TIFFErrorExtR(tif, module, "Integer overflow"); |
| n = 0; |
| } |
| } |
| return (n); |
| } |
| |
| /* |
| * Compute the # bytes in a (row-aligned) strip. |
| * |
| * Note that if RowsPerStrip is larger than the |
| * recorded ImageLength, then the strip size is |
| * truncated to reflect the actual space required |
| * to hold the strip. |
| */ |
| uint64_t TIFFStripSize64(TIFF *tif) |
| { |
| TIFFDirectory *td = &tif->tif_dir; |
| uint32_t rps = td->td_rowsperstrip; |
| if (rps > td->td_imagelength) |
| rps = td->td_imagelength; |
| return (TIFFVStripSize64(tif, rps)); |
| } |
| tmsize_t TIFFStripSize(TIFF *tif) |
| { |
| static const char module[] = "TIFFStripSize"; |
| uint64_t m; |
| m = TIFFStripSize64(tif); |
| return _TIFFCastUInt64ToSSize(tif, m, module); |
| } |
| |
| /* |
| * Compute a default strip size based on the image |
| * characteristics and a requested value. If the |
| * request is <1 then we choose a strip size according |
| * to certain heuristics. |
| */ |
| uint32_t TIFFDefaultStripSize(TIFF *tif, uint32_t request) |
| { |
| return (*tif->tif_defstripsize)(tif, request); |
| } |
| |
| uint32_t _TIFFDefaultStripSize(TIFF *tif, uint32_t s) |
| { |
| if ((int32_t)s < 1) |
| { |
| /* |
| * If RowsPerStrip is unspecified, try to break the |
| * image up into strips that are approximately |
| * STRIP_SIZE_DEFAULT bytes long. |
| */ |
| uint64_t scanlinesize; |
| uint64_t rows; |
| scanlinesize = TIFFScanlineSize64(tif); |
| if (scanlinesize == 0) |
| scanlinesize = 1; |
| rows = (uint64_t)STRIP_SIZE_DEFAULT / scanlinesize; |
| if (rows == 0) |
| rows = 1; |
| else if (rows > 0xFFFFFFFF) |
| rows = 0xFFFFFFFF; |
| s = (uint32_t)rows; |
| } |
| return (s); |
| } |
| |
| /* |
| * Return the number of bytes to read/write in a call to |
| * one of the scanline-oriented i/o routines. Note that |
| * this number may be 1/samples-per-pixel if data is |
| * stored as separate planes. |
| * The ScanlineSize in case of YCbCrSubsampling is defined as the |
| * strip size divided by the strip height, i.e. the size of a pack of vertical |
| * subsampling lines divided by vertical subsampling. It should thus make |
| * sense when multiplied by a multiple of vertical subsampling. |
| */ |
| uint64_t TIFFScanlineSize64(TIFF *tif) |
| { |
| static const char module[] = "TIFFScanlineSize64"; |
| TIFFDirectory *td = &tif->tif_dir; |
| uint64_t scanline_size; |
| if (td->td_planarconfig == PLANARCONFIG_CONTIG) |
| { |
| if ((td->td_photometric == PHOTOMETRIC_YCBCR) && |
| (td->td_samplesperpixel == 3) && (!isUpSampled(tif))) |
| { |
| uint16_t ycbcrsubsampling[2]; |
| uint16_t samplingblock_samples; |
| uint32_t samplingblocks_hor; |
| uint64_t samplingrow_samples; |
| uint64_t samplingrow_size; |
| if (td->td_samplesperpixel != 3) |
| { |
| TIFFErrorExtR(tif, module, "Invalid td_samplesperpixel value"); |
| return 0; |
| } |
| TIFFGetFieldDefaulted(tif, TIFFTAG_YCBCRSUBSAMPLING, |
| ycbcrsubsampling + 0, ycbcrsubsampling + 1); |
| if (((ycbcrsubsampling[0] != 1) && (ycbcrsubsampling[0] != 2) && |
| (ycbcrsubsampling[0] != 4)) || |
| ((ycbcrsubsampling[1] != 1) && (ycbcrsubsampling[1] != 2) && |
| (ycbcrsubsampling[1] != 4)) || |
| ((ycbcrsubsampling[0] == 0) || (ycbcrsubsampling[1] == 0))) |
| { |
| TIFFErrorExtR(tif, module, "Invalid YCbCr subsampling"); |
| return 0; |
| } |
| samplingblock_samples = |
| ycbcrsubsampling[0] * ycbcrsubsampling[1] + 2; |
| samplingblocks_hor = |
| TIFFhowmany_32(td->td_imagewidth, ycbcrsubsampling[0]); |
| samplingrow_samples = _TIFFMultiply64( |
| tif, samplingblocks_hor, samplingblock_samples, module); |
| samplingrow_size = |
| TIFFhowmany_64(_TIFFMultiply64(tif, samplingrow_samples, |
| td->td_bitspersample, module), |
| 8); |
| scanline_size = (samplingrow_size / ycbcrsubsampling[1]); |
| } |
| else |
| { |
| uint64_t scanline_samples; |
| uint32_t scanline_width = td->td_imagewidth; |
| |
| #if 0 |
| // Tries to fix https://gitlab.com/libtiff/libtiff/-/merge_requests/564 |
| // but causes regression when decoding legit files with tiffcp -c none |
| // Cf https://gitlab.com/libtiff/libtiff/-/merge_requests/644 |
| if (td->td_photometric == PHOTOMETRIC_YCBCR) |
| { |
| uint16_t subsampling_hor; |
| uint16_t ignored; |
| TIFFGetFieldDefaulted(tif, TIFFTAG_YCBCRSUBSAMPLING, |
| &subsampling_hor, &ignored); |
| if (subsampling_hor > 1) // roundup width for YCbCr |
| scanline_width = |
| TIFFroundup_32(scanline_width, subsampling_hor); |
| } |
| #endif |
| |
| scanline_samples = _TIFFMultiply64(tif, scanline_width, |
| td->td_samplesperpixel, module); |
| scanline_size = |
| TIFFhowmany_64(_TIFFMultiply64(tif, scanline_samples, |
| td->td_bitspersample, module), |
| 8); |
| } |
| } |
| else |
| { |
| scanline_size = |
| TIFFhowmany_64(_TIFFMultiply64(tif, td->td_imagewidth, |
| td->td_bitspersample, module), |
| 8); |
| } |
| if (scanline_size == 0) |
| { |
| TIFFErrorExtR(tif, module, "Computed scanline size is zero"); |
| return 0; |
| } |
| return (scanline_size); |
| } |
| tmsize_t TIFFScanlineSize(TIFF *tif) |
| { |
| static const char module[] = "TIFFScanlineSize"; |
| uint64_t m; |
| m = TIFFScanlineSize64(tif); |
| return _TIFFCastUInt64ToSSize(tif, m, module); |
| } |
| |
| /* |
| * Return the number of bytes required to store a complete |
| * decoded and packed raster scanline (as opposed to the |
| * I/O size returned by TIFFScanlineSize which may be less |
| * if data is store as separate planes). |
| */ |
| uint64_t TIFFRasterScanlineSize64(TIFF *tif) |
| { |
| static const char module[] = "TIFFRasterScanlineSize64"; |
| TIFFDirectory *td = &tif->tif_dir; |
| uint64_t scanline; |
| |
| scanline = |
| _TIFFMultiply64(tif, td->td_bitspersample, td->td_imagewidth, module); |
| if (td->td_planarconfig == PLANARCONFIG_CONTIG) |
| { |
| scanline = |
| _TIFFMultiply64(tif, scanline, td->td_samplesperpixel, module); |
| return (TIFFhowmany8_64(scanline)); |
| } |
| else |
| return (_TIFFMultiply64(tif, TIFFhowmany8_64(scanline), |
| td->td_samplesperpixel, module)); |
| } |
| tmsize_t TIFFRasterScanlineSize(TIFF *tif) |
| { |
| static const char module[] = "TIFFRasterScanlineSize"; |
| uint64_t m; |
| m = TIFFRasterScanlineSize64(tif); |
| return _TIFFCastUInt64ToSSize(tif, m, module); |
| } |
