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-rw-r--r--vendor/golang.org/x/image/tiff/reader.go709
1 files changed, 709 insertions, 0 deletions
diff --git a/vendor/golang.org/x/image/tiff/reader.go b/vendor/golang.org/x/image/tiff/reader.go
new file mode 100644
index 00000000..de73f4b9
--- /dev/null
+++ b/vendor/golang.org/x/image/tiff/reader.go
@@ -0,0 +1,709 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package tiff implements a TIFF image decoder and encoder.
+//
+// The TIFF specification is at http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf
+package tiff // import "golang.org/x/image/tiff"
+
+import (
+ "compress/zlib"
+ "encoding/binary"
+ "fmt"
+ "image"
+ "image/color"
+ "io"
+ "io/ioutil"
+ "math"
+
+ "golang.org/x/image/ccitt"
+ "golang.org/x/image/tiff/lzw"
+)
+
+// A FormatError reports that the input is not a valid TIFF image.
+type FormatError string
+
+func (e FormatError) Error() string {
+ return "tiff: invalid format: " + string(e)
+}
+
+// An UnsupportedError reports that the input uses a valid but
+// unimplemented feature.
+type UnsupportedError string
+
+func (e UnsupportedError) Error() string {
+ return "tiff: unsupported feature: " + string(e)
+}
+
+var errNoPixels = FormatError("not enough pixel data")
+
+type decoder struct {
+ r io.ReaderAt
+ byteOrder binary.ByteOrder
+ config image.Config
+ mode imageMode
+ bpp uint
+ features map[int][]uint
+ palette []color.Color
+
+ buf []byte
+ off int // Current offset in buf.
+ v uint32 // Buffer value for reading with arbitrary bit depths.
+ nbits uint // Remaining number of bits in v.
+}
+
+// firstVal returns the first uint of the features entry with the given tag,
+// or 0 if the tag does not exist.
+func (d *decoder) firstVal(tag int) uint {
+ f := d.features[tag]
+ if len(f) == 0 {
+ return 0
+ }
+ return f[0]
+}
+
+// ifdUint decodes the IFD entry in p, which must be of the Byte, Short
+// or Long type, and returns the decoded uint values.
+func (d *decoder) ifdUint(p []byte) (u []uint, err error) {
+ var raw []byte
+ if len(p) < ifdLen {
+ return nil, FormatError("bad IFD entry")
+ }
+
+ datatype := d.byteOrder.Uint16(p[2:4])
+ if dt := int(datatype); dt <= 0 || dt >= len(lengths) {
+ return nil, UnsupportedError("IFD entry datatype")
+ }
+
+ count := d.byteOrder.Uint32(p[4:8])
+ if count > math.MaxInt32/lengths[datatype] {
+ return nil, FormatError("IFD data too large")
+ }
+ if datalen := lengths[datatype] * count; datalen > 4 {
+ // The IFD contains a pointer to the real value.
+ raw = make([]byte, datalen)
+ _, err = d.r.ReadAt(raw, int64(d.byteOrder.Uint32(p[8:12])))
+ } else {
+ raw = p[8 : 8+datalen]
+ }
+ if err != nil {
+ return nil, err
+ }
+
+ u = make([]uint, count)
+ switch datatype {
+ case dtByte:
+ for i := uint32(0); i < count; i++ {
+ u[i] = uint(raw[i])
+ }
+ case dtShort:
+ for i := uint32(0); i < count; i++ {
+ u[i] = uint(d.byteOrder.Uint16(raw[2*i : 2*(i+1)]))
+ }
+ case dtLong:
+ for i := uint32(0); i < count; i++ {
+ u[i] = uint(d.byteOrder.Uint32(raw[4*i : 4*(i+1)]))
+ }
+ default:
+ return nil, UnsupportedError("data type")
+ }
+ return u, nil
+}
+
+// parseIFD decides whether the IFD entry in p is "interesting" and
+// stows away the data in the decoder. It returns the tag number of the
+// entry and an error, if any.
+func (d *decoder) parseIFD(p []byte) (int, error) {
+ tag := d.byteOrder.Uint16(p[0:2])
+ switch tag {
+ case tBitsPerSample,
+ tExtraSamples,
+ tPhotometricInterpretation,
+ tCompression,
+ tPredictor,
+ tStripOffsets,
+ tStripByteCounts,
+ tRowsPerStrip,
+ tTileWidth,
+ tTileLength,
+ tTileOffsets,
+ tTileByteCounts,
+ tImageLength,
+ tImageWidth,
+ tFillOrder,
+ tT4Options,
+ tT6Options:
+ val, err := d.ifdUint(p)
+ if err != nil {
+ return 0, err
+ }
+ d.features[int(tag)] = val
+ case tColorMap:
+ val, err := d.ifdUint(p)
+ if err != nil {
+ return 0, err
+ }
+ numcolors := len(val) / 3
+ if len(val)%3 != 0 || numcolors <= 0 || numcolors > 256 {
+ return 0, FormatError("bad ColorMap length")
+ }
+ d.palette = make([]color.Color, numcolors)
+ for i := 0; i < numcolors; i++ {
+ d.palette[i] = color.RGBA64{
+ uint16(val[i]),
+ uint16(val[i+numcolors]),
+ uint16(val[i+2*numcolors]),
+ 0xffff,
+ }
+ }
+ case tSampleFormat:
+ // Page 27 of the spec: If the SampleFormat is present and
+ // the value is not 1 [= unsigned integer data], a Baseline
+ // TIFF reader that cannot handle the SampleFormat value
+ // must terminate the import process gracefully.
+ val, err := d.ifdUint(p)
+ if err != nil {
+ return 0, err
+ }
+ for _, v := range val {
+ if v != 1 {
+ return 0, UnsupportedError("sample format")
+ }
+ }
+ }
+ return int(tag), nil
+}
+
+// readBits reads n bits from the internal buffer starting at the current offset.
+func (d *decoder) readBits(n uint) (v uint32, ok bool) {
+ for d.nbits < n {
+ d.v <<= 8
+ if d.off >= len(d.buf) {
+ return 0, false
+ }
+ d.v |= uint32(d.buf[d.off])
+ d.off++
+ d.nbits += 8
+ }
+ d.nbits -= n
+ rv := d.v >> d.nbits
+ d.v &^= rv << d.nbits
+ return rv, true
+}
+
+// flushBits discards the unread bits in the buffer used by readBits.
+// It is used at the end of a line.
+func (d *decoder) flushBits() {
+ d.v = 0
+ d.nbits = 0
+}
+
+// minInt returns the smaller of x or y.
+func minInt(a, b int) int {
+ if a <= b {
+ return a
+ }
+ return b
+}
+
+// decode decodes the raw data of an image.
+// It reads from d.buf and writes the strip or tile into dst.
+func (d *decoder) decode(dst image.Image, xmin, ymin, xmax, ymax int) error {
+ d.off = 0
+
+ // Apply horizontal predictor if necessary.
+ // In this case, p contains the color difference to the preceding pixel.
+ // See page 64-65 of the spec.
+ if d.firstVal(tPredictor) == prHorizontal {
+ switch d.bpp {
+ case 16:
+ var off int
+ n := 2 * len(d.features[tBitsPerSample]) // bytes per sample times samples per pixel
+ for y := ymin; y < ymax; y++ {
+ off += n
+ for x := 0; x < (xmax-xmin-1)*n; x += 2 {
+ if off+2 > len(d.buf) {
+ return errNoPixels
+ }
+ v0 := d.byteOrder.Uint16(d.buf[off-n : off-n+2])
+ v1 := d.byteOrder.Uint16(d.buf[off : off+2])
+ d.byteOrder.PutUint16(d.buf[off:off+2], v1+v0)
+ off += 2
+ }
+ }
+ case 8:
+ var off int
+ n := 1 * len(d.features[tBitsPerSample]) // bytes per sample times samples per pixel
+ for y := ymin; y < ymax; y++ {
+ off += n
+ for x := 0; x < (xmax-xmin-1)*n; x++ {
+ if off >= len(d.buf) {
+ return errNoPixels
+ }
+ d.buf[off] += d.buf[off-n]
+ off++
+ }
+ }
+ case 1:
+ return UnsupportedError("horizontal predictor with 1 BitsPerSample")
+ }
+ }
+
+ rMaxX := minInt(xmax, dst.Bounds().Max.X)
+ rMaxY := minInt(ymax, dst.Bounds().Max.Y)
+ switch d.mode {
+ case mGray, mGrayInvert:
+ if d.bpp == 16 {
+ img := dst.(*image.Gray16)
+ for y := ymin; y < rMaxY; y++ {
+ for x := xmin; x < rMaxX; x++ {
+ if d.off+2 > len(d.buf) {
+ return errNoPixels
+ }
+ v := d.byteOrder.Uint16(d.buf[d.off : d.off+2])
+ d.off += 2
+ if d.mode == mGrayInvert {
+ v = 0xffff - v
+ }
+ img.SetGray16(x, y, color.Gray16{v})
+ }
+ if rMaxX == img.Bounds().Max.X {
+ d.off += 2 * (xmax - img.Bounds().Max.X)
+ }
+ }
+ } else {
+ img := dst.(*image.Gray)
+ max := uint32((1 << d.bpp) - 1)
+ for y := ymin; y < rMaxY; y++ {
+ for x := xmin; x < rMaxX; x++ {
+ v, ok := d.readBits(d.bpp)
+ if !ok {
+ return errNoPixels
+ }
+ v = v * 0xff / max
+ if d.mode == mGrayInvert {
+ v = 0xff - v
+ }
+ img.SetGray(x, y, color.Gray{uint8(v)})
+ }
+ d.flushBits()
+ }
+ }
+ case mPaletted:
+ img := dst.(*image.Paletted)
+ for y := ymin; y < rMaxY; y++ {
+ for x := xmin; x < rMaxX; x++ {
+ v, ok := d.readBits(d.bpp)
+ if !ok {
+ return errNoPixels
+ }
+ img.SetColorIndex(x, y, uint8(v))
+ }
+ d.flushBits()
+ }
+ case mRGB:
+ if d.bpp == 16 {
+ img := dst.(*image.RGBA64)
+ for y := ymin; y < rMaxY; y++ {
+ for x := xmin; x < rMaxX; x++ {
+ if d.off+6 > len(d.buf) {
+ return errNoPixels
+ }
+ r := d.byteOrder.Uint16(d.buf[d.off+0 : d.off+2])
+ g := d.byteOrder.Uint16(d.buf[d.off+2 : d.off+4])
+ b := d.byteOrder.Uint16(d.buf[d.off+4 : d.off+6])
+ d.off += 6
+ img.SetRGBA64(x, y, color.RGBA64{r, g, b, 0xffff})
+ }
+ }
+ } else {
+ img := dst.(*image.RGBA)
+ for y := ymin; y < rMaxY; y++ {
+ min := img.PixOffset(xmin, y)
+ max := img.PixOffset(rMaxX, y)
+ off := (y - ymin) * (xmax - xmin) * 3
+ for i := min; i < max; i += 4 {
+ if off+3 > len(d.buf) {
+ return errNoPixels
+ }
+ img.Pix[i+0] = d.buf[off+0]
+ img.Pix[i+1] = d.buf[off+1]
+ img.Pix[i+2] = d.buf[off+2]
+ img.Pix[i+3] = 0xff
+ off += 3
+ }
+ }
+ }
+ case mNRGBA:
+ if d.bpp == 16 {
+ img := dst.(*image.NRGBA64)
+ for y := ymin; y < rMaxY; y++ {
+ for x := xmin; x < rMaxX; x++ {
+ if d.off+8 > len(d.buf) {
+ return errNoPixels
+ }
+ r := d.byteOrder.Uint16(d.buf[d.off+0 : d.off+2])
+ g := d.byteOrder.Uint16(d.buf[d.off+2 : d.off+4])
+ b := d.byteOrder.Uint16(d.buf[d.off+4 : d.off+6])
+ a := d.byteOrder.Uint16(d.buf[d.off+6 : d.off+8])
+ d.off += 8
+ img.SetNRGBA64(x, y, color.NRGBA64{r, g, b, a})
+ }
+ }
+ } else {
+ img := dst.(*image.NRGBA)
+ for y := ymin; y < rMaxY; y++ {
+ min := img.PixOffset(xmin, y)
+ max := img.PixOffset(rMaxX, y)
+ i0, i1 := (y-ymin)*(xmax-xmin)*4, (y-ymin+1)*(xmax-xmin)*4
+ if i1 > len(d.buf) {
+ return errNoPixels
+ }
+ copy(img.Pix[min:max], d.buf[i0:i1])
+ }
+ }
+ case mRGBA:
+ if d.bpp == 16 {
+ img := dst.(*image.RGBA64)
+ for y := ymin; y < rMaxY; y++ {
+ for x := xmin; x < rMaxX; x++ {
+ if d.off+8 > len(d.buf) {
+ return errNoPixels
+ }
+ r := d.byteOrder.Uint16(d.buf[d.off+0 : d.off+2])
+ g := d.byteOrder.Uint16(d.buf[d.off+2 : d.off+4])
+ b := d.byteOrder.Uint16(d.buf[d.off+4 : d.off+6])
+ a := d.byteOrder.Uint16(d.buf[d.off+6 : d.off+8])
+ d.off += 8
+ img.SetRGBA64(x, y, color.RGBA64{r, g, b, a})
+ }
+ }
+ } else {
+ img := dst.(*image.RGBA)
+ for y := ymin; y < rMaxY; y++ {
+ min := img.PixOffset(xmin, y)
+ max := img.PixOffset(rMaxX, y)
+ i0, i1 := (y-ymin)*(xmax-xmin)*4, (y-ymin+1)*(xmax-xmin)*4
+ if i1 > len(d.buf) {
+ return errNoPixels
+ }
+ copy(img.Pix[min:max], d.buf[i0:i1])
+ }
+ }
+ }
+
+ return nil
+}
+
+func newDecoder(r io.Reader) (*decoder, error) {
+ d := &decoder{
+ r: newReaderAt(r),
+ features: make(map[int][]uint),
+ }
+
+ p := make([]byte, 8)
+ if _, err := d.r.ReadAt(p, 0); err != nil {
+ if err == io.EOF {
+ err = io.ErrUnexpectedEOF
+ }
+ return nil, err
+ }
+ switch string(p[0:4]) {
+ case leHeader:
+ d.byteOrder = binary.LittleEndian
+ case beHeader:
+ d.byteOrder = binary.BigEndian
+ default:
+ return nil, FormatError("malformed header")
+ }
+
+ ifdOffset := int64(d.byteOrder.Uint32(p[4:8]))
+
+ // The first two bytes contain the number of entries (12 bytes each).
+ if _, err := d.r.ReadAt(p[0:2], ifdOffset); err != nil {
+ return nil, err
+ }
+ numItems := int(d.byteOrder.Uint16(p[0:2]))
+
+ // All IFD entries are read in one chunk.
+ p = make([]byte, ifdLen*numItems)
+ if _, err := d.r.ReadAt(p, ifdOffset+2); err != nil {
+ return nil, err
+ }
+
+ prevTag := -1
+ for i := 0; i < len(p); i += ifdLen {
+ tag, err := d.parseIFD(p[i : i+ifdLen])
+ if err != nil {
+ return nil, err
+ }
+ if tag <= prevTag {
+ return nil, FormatError("tags are not sorted in ascending order")
+ }
+ prevTag = tag
+ }
+
+ d.config.Width = int(d.firstVal(tImageWidth))
+ d.config.Height = int(d.firstVal(tImageLength))
+
+ if _, ok := d.features[tBitsPerSample]; !ok {
+ // Default is 1 per specification.
+ d.features[tBitsPerSample] = []uint{1}
+ }
+ d.bpp = d.firstVal(tBitsPerSample)
+ switch d.bpp {
+ case 0:
+ return nil, FormatError("BitsPerSample must not be 0")
+ case 1, 8, 16:
+ // Nothing to do, these are accepted by this implementation.
+ default:
+ return nil, UnsupportedError(fmt.Sprintf("BitsPerSample of %v", d.bpp))
+ }
+
+ // Determine the image mode.
+ switch d.firstVal(tPhotometricInterpretation) {
+ case pRGB:
+ if d.bpp == 16 {
+ for _, b := range d.features[tBitsPerSample] {
+ if b != 16 {
+ return nil, FormatError("wrong number of samples for 16bit RGB")
+ }
+ }
+ } else {
+ for _, b := range d.features[tBitsPerSample] {
+ if b != 8 {
+ return nil, FormatError("wrong number of samples for 8bit RGB")
+ }
+ }
+ }
+ // RGB images normally have 3 samples per pixel.
+ // If there are more, ExtraSamples (p. 31-32 of the spec)
+ // gives their meaning (usually an alpha channel).
+ //
+ // This implementation does not support extra samples
+ // of an unspecified type.
+ switch len(d.features[tBitsPerSample]) {
+ case 3:
+ d.mode = mRGB
+ if d.bpp == 16 {
+ d.config.ColorModel = color.RGBA64Model
+ } else {
+ d.config.ColorModel = color.RGBAModel
+ }
+ case 4:
+ switch d.firstVal(tExtraSamples) {
+ case 1:
+ d.mode = mRGBA
+ if d.bpp == 16 {
+ d.config.ColorModel = color.RGBA64Model
+ } else {
+ d.config.ColorModel = color.RGBAModel
+ }
+ case 2:
+ d.mode = mNRGBA
+ if d.bpp == 16 {
+ d.config.ColorModel = color.NRGBA64Model
+ } else {
+ d.config.ColorModel = color.NRGBAModel
+ }
+ default:
+ return nil, FormatError("wrong number of samples for RGB")
+ }
+ default:
+ return nil, FormatError("wrong number of samples for RGB")
+ }
+ case pPaletted:
+ d.mode = mPaletted
+ d.config.ColorModel = color.Palette(d.palette)
+ case pWhiteIsZero:
+ d.mode = mGrayInvert
+ if d.bpp == 16 {
+ d.config.ColorModel = color.Gray16Model
+ } else {
+ d.config.ColorModel = color.GrayModel
+ }
+ case pBlackIsZero:
+ d.mode = mGray
+ if d.bpp == 16 {
+ d.config.ColorModel = color.Gray16Model
+ } else {
+ d.config.ColorModel = color.GrayModel
+ }
+ default:
+ return nil, UnsupportedError("color model")
+ }
+
+ return d, nil
+}
+
+// DecodeConfig returns the color model and dimensions of a TIFF image without
+// decoding the entire image.
+func DecodeConfig(r io.Reader) (image.Config, error) {
+ d, err := newDecoder(r)
+ if err != nil {
+ return image.Config{}, err
+ }
+ return d.config, nil
+}
+
+func ccittFillOrder(tiffFillOrder uint) ccitt.Order {
+ if tiffFillOrder == 2 {
+ return ccitt.LSB
+ }
+ return ccitt.MSB
+}
+
+// Decode reads a TIFF image from r and returns it as an image.Image.
+// The type of Image returned depends on the contents of the TIFF.
+func Decode(r io.Reader) (img image.Image, err error) {
+ d, err := newDecoder(r)
+ if err != nil {
+ return
+ }
+
+ blockPadding := false
+ blockWidth := d.config.Width
+ blockHeight := d.config.Height
+ blocksAcross := 1
+ blocksDown := 1
+
+ if d.config.Width == 0 {
+ blocksAcross = 0
+ }
+ if d.config.Height == 0 {
+ blocksDown = 0
+ }
+
+ var blockOffsets, blockCounts []uint
+
+ if int(d.firstVal(tTileWidth)) != 0 {
+ blockPadding = true
+
+ blockWidth = int(d.firstVal(tTileWidth))
+ blockHeight = int(d.firstVal(tTileLength))
+
+ if blockWidth != 0 {
+ blocksAcross = (d.config.Width + blockWidth - 1) / blockWidth
+ }
+ if blockHeight != 0 {
+ blocksDown = (d.config.Height + blockHeight - 1) / blockHeight
+ }
+
+ blockCounts = d.features[tTileByteCounts]
+ blockOffsets = d.features[tTileOffsets]
+
+ } else {
+ if int(d.firstVal(tRowsPerStrip)) != 0 {
+ blockHeight = int(d.firstVal(tRowsPerStrip))
+ }
+
+ if blockHeight != 0 {
+ blocksDown = (d.config.Height + blockHeight - 1) / blockHeight
+ }
+
+ blockOffsets = d.features[tStripOffsets]
+ blockCounts = d.features[tStripByteCounts]
+ }
+
+ // Check if we have the right number of strips/tiles, offsets and counts.
+ if n := blocksAcross * blocksDown; len(blockOffsets) < n || len(blockCounts) < n {
+ return nil, FormatError("inconsistent header")
+ }
+
+ imgRect := image.Rect(0, 0, d.config.Width, d.config.Height)
+ switch d.mode {
+ case mGray, mGrayInvert:
+ if d.bpp == 16 {
+ img = image.NewGray16(imgRect)
+ } else {
+ img = image.NewGray(imgRect)
+ }
+ case mPaletted:
+ img = image.NewPaletted(imgRect, d.palette)
+ case mNRGBA:
+ if d.bpp == 16 {
+ img = image.NewNRGBA64(imgRect)
+ } else {
+ img = image.NewNRGBA(imgRect)
+ }
+ case mRGB, mRGBA:
+ if d.bpp == 16 {
+ img = image.NewRGBA64(imgRect)
+ } else {
+ img = image.NewRGBA(imgRect)
+ }
+ }
+
+ for i := 0; i < blocksAcross; i++ {
+ blkW := blockWidth
+ if !blockPadding && i == blocksAcross-1 && d.config.Width%blockWidth != 0 {
+ blkW = d.config.Width % blockWidth
+ }
+ for j := 0; j < blocksDown; j++ {
+ blkH := blockHeight
+ if !blockPadding && j == blocksDown-1 && d.config.Height%blockHeight != 0 {
+ blkH = d.config.Height % blockHeight
+ }
+ offset := int64(blockOffsets[j*blocksAcross+i])
+ n := int64(blockCounts[j*blocksAcross+i])
+ switch d.firstVal(tCompression) {
+
+ // According to the spec, Compression does not have a default value,
+ // but some tools interpret a missing Compression value as none so we do
+ // the same.
+ case cNone, 0:
+ if b, ok := d.r.(*buffer); ok {
+ d.buf, err = b.Slice(int(offset), int(n))
+ } else {
+ d.buf = make([]byte, n)
+ _, err = d.r.ReadAt(d.buf, offset)
+ }
+ case cG3:
+ inv := d.firstVal(tPhotometricInterpretation) == pWhiteIsZero
+ order := ccittFillOrder(d.firstVal(tFillOrder))
+ r := ccitt.NewReader(io.NewSectionReader(d.r, offset, n), order, ccitt.Group3, blkW, blkH, &ccitt.Options{Invert: inv, Align: false})
+ d.buf, err = ioutil.ReadAll(r)
+ case cG4:
+ inv := d.firstVal(tPhotometricInterpretation) == pWhiteIsZero
+ order := ccittFillOrder(d.firstVal(tFillOrder))
+ r := ccitt.NewReader(io.NewSectionReader(d.r, offset, n), order, ccitt.Group4, blkW, blkH, &ccitt.Options{Invert: inv, Align: false})
+ d.buf, err = ioutil.ReadAll(r)
+ case cLZW:
+ r := lzw.NewReader(io.NewSectionReader(d.r, offset, n), lzw.MSB, 8)
+ d.buf, err = ioutil.ReadAll(r)
+ r.Close()
+ case cDeflate, cDeflateOld:
+ var r io.ReadCloser
+ r, err = zlib.NewReader(io.NewSectionReader(d.r, offset, n))
+ if err != nil {
+ return nil, err
+ }
+ d.buf, err = ioutil.ReadAll(r)
+ r.Close()
+ case cPackBits:
+ d.buf, err = unpackBits(io.NewSectionReader(d.r, offset, n))
+ default:
+ err = UnsupportedError(fmt.Sprintf("compression value %d", d.firstVal(tCompression)))
+ }
+ if err != nil {
+ return nil, err
+ }
+
+ xmin := i * blockWidth
+ ymin := j * blockHeight
+ xmax := xmin + blkW
+ ymax := ymin + blkH
+ err = d.decode(img, xmin, ymin, xmax, ymax)
+ if err != nil {
+ return nil, err
+ }
+ }
+ }
+ return
+}
+
+func init() {
+ image.RegisterFormat("tiff", leHeader, Decode, DecodeConfig)
+ image.RegisterFormat("tiff", beHeader, Decode, DecodeConfig)
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 11:27:13 +0000