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-rw-r--r--vendor/golang.org/x/image/bmp/reader.go219
-rw-r--r--vendor/golang.org/x/image/bmp/writer.go262
-rw-r--r--vendor/golang.org/x/image/ccitt/reader.go795
-rw-r--r--vendor/golang.org/x/image/ccitt/table.go972
-rw-r--r--vendor/golang.org/x/image/ccitt/writer.go102
-rw-r--r--vendor/golang.org/x/image/tiff/buffer.go69
-rw-r--r--vendor/golang.org/x/image/tiff/compress.go58
-rw-r--r--vendor/golang.org/x/image/tiff/consts.go149
-rw-r--r--vendor/golang.org/x/image/tiff/fuzz.go30
-rw-r--r--vendor/golang.org/x/image/tiff/lzw/reader.go272
-rw-r--r--vendor/golang.org/x/image/tiff/reader.go709
-rw-r--r--vendor/golang.org/x/image/tiff/writer.go438
12 files changed, 0 insertions, 4075 deletions
diff --git a/vendor/golang.org/x/image/bmp/reader.go b/vendor/golang.org/x/image/bmp/reader.go
deleted file mode 100644
index 52e25205..00000000
--- a/vendor/golang.org/x/image/bmp/reader.go
+++ /dev/null
@@ -1,219 +0,0 @@
-// 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 bmp implements a BMP image decoder and encoder.
-//
-// The BMP specification is at http://www.digicamsoft.com/bmp/bmp.html.
-package bmp // import "golang.org/x/image/bmp"
-
-import (
- "errors"
- "image"
- "image/color"
- "io"
-)
-
-// ErrUnsupported means that the input BMP image uses a valid but unsupported
-// feature.
-var ErrUnsupported = errors.New("bmp: unsupported BMP image")
-
-func readUint16(b []byte) uint16 {
- return uint16(b[0]) | uint16(b[1])<<8
-}
-
-func readUint32(b []byte) uint32 {
- return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
-}
-
-// decodePaletted reads an 8 bit-per-pixel BMP image from r.
-// If topDown is false, the image rows will be read bottom-up.
-func decodePaletted(r io.Reader, c image.Config, topDown bool) (image.Image, error) {
- paletted := image.NewPaletted(image.Rect(0, 0, c.Width, c.Height), c.ColorModel.(color.Palette))
- if c.Width == 0 || c.Height == 0 {
- return paletted, nil
- }
- var tmp [4]byte
- y0, y1, yDelta := c.Height-1, -1, -1
- if topDown {
- y0, y1, yDelta = 0, c.Height, +1
- }
- for y := y0; y != y1; y += yDelta {
- p := paletted.Pix[y*paletted.Stride : y*paletted.Stride+c.Width]
- if _, err := io.ReadFull(r, p); err != nil {
- return nil, err
- }
- // Each row is 4-byte aligned.
- if c.Width%4 != 0 {
- _, err := io.ReadFull(r, tmp[:4-c.Width%4])
- if err != nil {
- return nil, err
- }
- }
- }
- return paletted, nil
-}
-
-// decodeRGB reads a 24 bit-per-pixel BMP image from r.
-// If topDown is false, the image rows will be read bottom-up.
-func decodeRGB(r io.Reader, c image.Config, topDown bool) (image.Image, error) {
- rgba := image.NewRGBA(image.Rect(0, 0, c.Width, c.Height))
- if c.Width == 0 || c.Height == 0 {
- return rgba, nil
- }
- // There are 3 bytes per pixel, and each row is 4-byte aligned.
- b := make([]byte, (3*c.Width+3)&^3)
- y0, y1, yDelta := c.Height-1, -1, -1
- if topDown {
- y0, y1, yDelta = 0, c.Height, +1
- }
- for y := y0; y != y1; y += yDelta {
- if _, err := io.ReadFull(r, b); err != nil {
- return nil, err
- }
- p := rgba.Pix[y*rgba.Stride : y*rgba.Stride+c.Width*4]
- for i, j := 0, 0; i < len(p); i, j = i+4, j+3 {
- // BMP images are stored in BGR order rather than RGB order.
- p[i+0] = b[j+2]
- p[i+1] = b[j+1]
- p[i+2] = b[j+0]
- p[i+3] = 0xFF
- }
- }
- return rgba, nil
-}
-
-// decodeNRGBA reads a 32 bit-per-pixel BMP image from r.
-// If topDown is false, the image rows will be read bottom-up.
-func decodeNRGBA(r io.Reader, c image.Config, topDown bool) (image.Image, error) {
- rgba := image.NewNRGBA(image.Rect(0, 0, c.Width, c.Height))
- if c.Width == 0 || c.Height == 0 {
- return rgba, nil
- }
- y0, y1, yDelta := c.Height-1, -1, -1
- if topDown {
- y0, y1, yDelta = 0, c.Height, +1
- }
- for y := y0; y != y1; y += yDelta {
- p := rgba.Pix[y*rgba.Stride : y*rgba.Stride+c.Width*4]
- if _, err := io.ReadFull(r, p); err != nil {
- return nil, err
- }
- for i := 0; i < len(p); i += 4 {
- // BMP images are stored in BGRA order rather than RGBA order.
- p[i+0], p[i+2] = p[i+2], p[i+0]
- }
- }
- return rgba, nil
-}
-
-// Decode reads a BMP image from r and returns it as an image.Image.
-// Limitation: The file must be 8, 24 or 32 bits per pixel.
-func Decode(r io.Reader) (image.Image, error) {
- c, bpp, topDown, err := decodeConfig(r)
- if err != nil {
- return nil, err
- }
- switch bpp {
- case 8:
- return decodePaletted(r, c, topDown)
- case 24:
- return decodeRGB(r, c, topDown)
- case 32:
- return decodeNRGBA(r, c, topDown)
- }
- panic("unreachable")
-}
-
-// DecodeConfig returns the color model and dimensions of a BMP image without
-// decoding the entire image.
-// Limitation: The file must be 8, 24 or 32 bits per pixel.
-func DecodeConfig(r io.Reader) (image.Config, error) {
- config, _, _, err := decodeConfig(r)
- return config, err
-}
-
-func decodeConfig(r io.Reader) (config image.Config, bitsPerPixel int, topDown bool, err error) {
- // We only support those BMP images that are a BITMAPFILEHEADER
- // immediately followed by a BITMAPINFOHEADER.
- const (
- fileHeaderLen = 14
- infoHeaderLen = 40
- v4InfoHeaderLen = 108
- v5InfoHeaderLen = 124
- )
- var b [1024]byte
- if _, err := io.ReadFull(r, b[:fileHeaderLen+4]); err != nil {
- if err == io.EOF {
- err = io.ErrUnexpectedEOF
- }
- return image.Config{}, 0, false, err
- }
- if string(b[:2]) != "BM" {
- return image.Config{}, 0, false, errors.New("bmp: invalid format")
- }
- offset := readUint32(b[10:14])
- infoLen := readUint32(b[14:18])
- if infoLen != infoHeaderLen && infoLen != v4InfoHeaderLen && infoLen != v5InfoHeaderLen {
- return image.Config{}, 0, false, ErrUnsupported
- }
- if _, err := io.ReadFull(r, b[fileHeaderLen+4:fileHeaderLen+infoLen]); err != nil {
- if err == io.EOF {
- err = io.ErrUnexpectedEOF
- }
- return image.Config{}, 0, false, err
- }
- width := int(int32(readUint32(b[18:22])))
- height := int(int32(readUint32(b[22:26])))
- if height < 0 {
- height, topDown = -height, true
- }
- if width < 0 || height < 0 {
- return image.Config{}, 0, false, ErrUnsupported
- }
- // We only support 1 plane and 8, 24 or 32 bits per pixel and no
- // compression.
- planes, bpp, compression := readUint16(b[26:28]), readUint16(b[28:30]), readUint32(b[30:34])
- // if compression is set to BITFIELDS, but the bitmask is set to the default bitmask
- // that would be used if compression was set to 0, we can continue as if compression was 0
- if compression == 3 && infoLen > infoHeaderLen &&
- readUint32(b[54:58]) == 0xff0000 && readUint32(b[58:62]) == 0xff00 &&
- readUint32(b[62:66]) == 0xff && readUint32(b[66:70]) == 0xff000000 {
- compression = 0
- }
- if planes != 1 || compression != 0 {
- return image.Config{}, 0, false, ErrUnsupported
- }
- switch bpp {
- case 8:
- if offset != fileHeaderLen+infoLen+256*4 {
- return image.Config{}, 0, false, ErrUnsupported
- }
- _, err = io.ReadFull(r, b[:256*4])
- if err != nil {
- return image.Config{}, 0, false, err
- }
- pcm := make(color.Palette, 256)
- for i := range pcm {
- // BMP images are stored in BGR order rather than RGB order.
- // Every 4th byte is padding.
- pcm[i] = color.RGBA{b[4*i+2], b[4*i+1], b[4*i+0], 0xFF}
- }
- return image.Config{ColorModel: pcm, Width: width, Height: height}, 8, topDown, nil
- case 24:
- if offset != fileHeaderLen+infoLen {
- return image.Config{}, 0, false, ErrUnsupported
- }
- return image.Config{ColorModel: color.RGBAModel, Width: width, Height: height}, 24, topDown, nil
- case 32:
- if offset != fileHeaderLen+infoLen {
- return image.Config{}, 0, false, ErrUnsupported
- }
- return image.Config{ColorModel: color.RGBAModel, Width: width, Height: height}, 32, topDown, nil
- }
- return image.Config{}, 0, false, ErrUnsupported
-}
-
-func init() {
- image.RegisterFormat("bmp", "BM????\x00\x00\x00\x00", Decode, DecodeConfig)
-}
diff --git a/vendor/golang.org/x/image/bmp/writer.go b/vendor/golang.org/x/image/bmp/writer.go
deleted file mode 100644
index f07b39db..00000000
--- a/vendor/golang.org/x/image/bmp/writer.go
+++ /dev/null
@@ -1,262 +0,0 @@
-// Copyright 2013 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 bmp
-
-import (
- "encoding/binary"
- "errors"
- "image"
- "io"
-)
-
-type header struct {
- sigBM [2]byte
- fileSize uint32
- resverved [2]uint16
- pixOffset uint32
- dibHeaderSize uint32
- width uint32
- height uint32
- colorPlane uint16
- bpp uint16
- compression uint32
- imageSize uint32
- xPixelsPerMeter uint32
- yPixelsPerMeter uint32
- colorUse uint32
- colorImportant uint32
-}
-
-func encodePaletted(w io.Writer, pix []uint8, dx, dy, stride, step int) error {
- var padding []byte
- if dx < step {
- padding = make([]byte, step-dx)
- }
- for y := dy - 1; y >= 0; y-- {
- min := y*stride + 0
- max := y*stride + dx
- if _, err := w.Write(pix[min:max]); err != nil {
- return err
- }
- if padding != nil {
- if _, err := w.Write(padding); err != nil {
- return err
- }
- }
- }
- return nil
-}
-
-func encodeRGBA(w io.Writer, pix []uint8, dx, dy, stride, step int, opaque bool) error {
- buf := make([]byte, step)
- if opaque {
- for y := dy - 1; y >= 0; y-- {
- min := y*stride + 0
- max := y*stride + dx*4
- off := 0
- for i := min; i < max; i += 4 {
- buf[off+2] = pix[i+0]
- buf[off+1] = pix[i+1]
- buf[off+0] = pix[i+2]
- off += 3
- }
- if _, err := w.Write(buf); err != nil {
- return err
- }
- }
- } else {
- for y := dy - 1; y >= 0; y-- {
- min := y*stride + 0
- max := y*stride + dx*4
- off := 0
- for i := min; i < max; i += 4 {
- a := uint32(pix[i+3])
- if a == 0 {
- buf[off+2] = 0
- buf[off+1] = 0
- buf[off+0] = 0
- buf[off+3] = 0
- off += 4
- continue
- } else if a == 0xff {
- buf[off+2] = pix[i+0]
- buf[off+1] = pix[i+1]
- buf[off+0] = pix[i+2]
- buf[off+3] = 0xff
- off += 4
- continue
- }
- buf[off+2] = uint8(((uint32(pix[i+0]) * 0xffff) / a) >> 8)
- buf[off+1] = uint8(((uint32(pix[i+1]) * 0xffff) / a) >> 8)
- buf[off+0] = uint8(((uint32(pix[i+2]) * 0xffff) / a) >> 8)
- buf[off+3] = uint8(a)
- off += 4
- }
- if _, err := w.Write(buf); err != nil {
- return err
- }
- }
- }
- return nil
-}
-
-func encodeNRGBA(w io.Writer, pix []uint8, dx, dy, stride, step int, opaque bool) error {
- buf := make([]byte, step)
- if opaque {
- for y := dy - 1; y >= 0; y-- {
- min := y*stride + 0
- max := y*stride + dx*4
- off := 0
- for i := min; i < max; i += 4 {
- buf[off+2] = pix[i+0]
- buf[off+1] = pix[i+1]
- buf[off+0] = pix[i+2]
- off += 3
- }
- if _, err := w.Write(buf); err != nil {
- return err
- }
- }
- } else {
- for y := dy - 1; y >= 0; y-- {
- min := y*stride + 0
- max := y*stride + dx*4
- off := 0
- for i := min; i < max; i += 4 {
- buf[off+2] = pix[i+0]
- buf[off+1] = pix[i+1]
- buf[off+0] = pix[i+2]
- buf[off+3] = pix[i+3]
- off += 4
- }
- if _, err := w.Write(buf); err != nil {
- return err
- }
- }
- }
- return nil
-}
-
-func encode(w io.Writer, m image.Image, step int) error {
- b := m.Bounds()
- buf := make([]byte, step)
- for y := b.Max.Y - 1; y >= b.Min.Y; y-- {
- off := 0
- for x := b.Min.X; x < b.Max.X; x++ {
- r, g, b, _ := m.At(x, y).RGBA()
- buf[off+2] = byte(r >> 8)
- buf[off+1] = byte(g >> 8)
- buf[off+0] = byte(b >> 8)
- off += 3
- }
- if _, err := w.Write(buf); err != nil {
- return err
- }
- }
- return nil
-}
-
-// Encode writes the image m to w in BMP format.
-func Encode(w io.Writer, m image.Image) error {
- d := m.Bounds().Size()
- if d.X < 0 || d.Y < 0 {
- return errors.New("bmp: negative bounds")
- }
- h := &header{
- sigBM: [2]byte{'B', 'M'},
- fileSize: 14 + 40,
- pixOffset: 14 + 40,
- dibHeaderSize: 40,
- width: uint32(d.X),
- height: uint32(d.Y),
- colorPlane: 1,
- }
-
- var step int
- var palette []byte
- var opaque bool
- switch m := m.(type) {
- case *image.Gray:
- step = (d.X + 3) &^ 3
- palette = make([]byte, 1024)
- for i := 0; i < 256; i++ {
- palette[i*4+0] = uint8(i)
- palette[i*4+1] = uint8(i)
- palette[i*4+2] = uint8(i)
- palette[i*4+3] = 0xFF
- }
- h.imageSize = uint32(d.Y * step)
- h.fileSize += uint32(len(palette)) + h.imageSize
- h.pixOffset += uint32(len(palette))
- h.bpp = 8
-
- case *image.Paletted:
- step = (d.X + 3) &^ 3
- palette = make([]byte, 1024)
- for i := 0; i < len(m.Palette) && i < 256; i++ {
- r, g, b, _ := m.Palette[i].RGBA()
- palette[i*4+0] = uint8(b >> 8)
- palette[i*4+1] = uint8(g >> 8)
- palette[i*4+2] = uint8(r >> 8)
- palette[i*4+3] = 0xFF
- }
- h.imageSize = uint32(d.Y * step)
- h.fileSize += uint32(len(palette)) + h.imageSize
- h.pixOffset += uint32(len(palette))
- h.bpp = 8
- case *image.RGBA:
- opaque = m.Opaque()
- if opaque {
- step = (3*d.X + 3) &^ 3
- h.bpp = 24
- } else {
- step = 4 * d.X
- h.bpp = 32
- }
- h.imageSize = uint32(d.Y * step)
- h.fileSize += h.imageSize
- case *image.NRGBA:
- opaque = m.Opaque()
- if opaque {
- step = (3*d.X + 3) &^ 3
- h.bpp = 24
- } else {
- step = 4 * d.X
- h.bpp = 32
- }
- h.imageSize = uint32(d.Y * step)
- h.fileSize += h.imageSize
- default:
- step = (3*d.X + 3) &^ 3
- h.imageSize = uint32(d.Y * step)
- h.fileSize += h.imageSize
- h.bpp = 24
- }
-
- if err := binary.Write(w, binary.LittleEndian, h); err != nil {
- return err
- }
- if palette != nil {
- if err := binary.Write(w, binary.LittleEndian, palette); err != nil {
- return err
- }
- }
-
- if d.X == 0 || d.Y == 0 {
- return nil
- }
-
- switch m := m.(type) {
- case *image.Gray:
- return encodePaletted(w, m.Pix, d.X, d.Y, m.Stride, step)
- case *image.Paletted:
- return encodePaletted(w, m.Pix, d.X, d.Y, m.Stride, step)
- case *image.RGBA:
- return encodeRGBA(w, m.Pix, d.X, d.Y, m.Stride, step, opaque)
- case *image.NRGBA:
- return encodeNRGBA(w, m.Pix, d.X, d.Y, m.Stride, step, opaque)
- }
- return encode(w, m, step)
-}
diff --git a/vendor/golang.org/x/image/ccitt/reader.go b/vendor/golang.org/x/image/ccitt/reader.go
deleted file mode 100644
index 340de053..00000000
--- a/vendor/golang.org/x/image/ccitt/reader.go
+++ /dev/null
@@ -1,795 +0,0 @@
-// Copyright 2019 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.
-
-//go:generate go run gen.go
-
-// Package ccitt implements a CCITT (fax) image decoder.
-package ccitt
-
-import (
- "encoding/binary"
- "errors"
- "image"
- "io"
- "math/bits"
-)
-
-var (
- errIncompleteCode = errors.New("ccitt: incomplete code")
- errInvalidBounds = errors.New("ccitt: invalid bounds")
- errInvalidCode = errors.New("ccitt: invalid code")
- errInvalidMode = errors.New("ccitt: invalid mode")
- errInvalidOffset = errors.New("ccitt: invalid offset")
- errMissingEOL = errors.New("ccitt: missing End-of-Line")
- errRunLengthOverflowsWidth = errors.New("ccitt: run length overflows width")
- errRunLengthTooLong = errors.New("ccitt: run length too long")
- errUnsupportedMode = errors.New("ccitt: unsupported mode")
- errUnsupportedSubFormat = errors.New("ccitt: unsupported sub-format")
- errUnsupportedWidth = errors.New("ccitt: unsupported width")
-)
-
-// Order specifies the bit ordering in a CCITT data stream.
-type Order uint32
-
-const (
- // LSB means Least Significant Bits first.
- LSB Order = iota
- // MSB means Most Significant Bits first.
- MSB
-)
-
-// SubFormat represents that the CCITT format consists of a number of
-// sub-formats. Decoding or encoding a CCITT data stream requires knowing the
-// sub-format context. It is not represented in the data stream per se.
-type SubFormat uint32
-
-const (
- Group3 SubFormat = iota
- Group4
-)
-
-// AutoDetectHeight is passed as the height argument to NewReader to indicate
-// that the image height (the number of rows) is not known in advance.
-const AutoDetectHeight = -1
-
-// Options are optional parameters.
-type Options struct {
- // Align means that some variable-bit-width codes are byte-aligned.
- Align bool
- // Invert means that black is the 1 bit or 0xFF byte, and white is 0.
- Invert bool
-}
-
-// maxWidth is the maximum (inclusive) supported width. This is a limitation of
-// this implementation, to guard against integer overflow, and not anything
-// inherent to the CCITT format.
-const maxWidth = 1 << 20
-
-func invertBytes(b []byte) {
- for i, c := range b {
- b[i] = ^c
- }
-}
-
-func reverseBitsWithinBytes(b []byte) {
- for i, c := range b {
- b[i] = bits.Reverse8(c)
- }
-}
-
-// highBits writes to dst (1 bit per pixel, most significant bit first) the
-// high (0x80) bits from src (1 byte per pixel). It returns the number of bytes
-// written and read such that dst[:d] is the packed form of src[:s].
-//
-// For example, if src starts with the 8 bytes [0x7D, 0x7E, 0x7F, 0x80, 0x81,
-// 0x82, 0x00, 0xFF] then 0x1D will be written to dst[0].
-//
-// If src has (8 * len(dst)) or more bytes then only len(dst) bytes are
-// written, (8 * len(dst)) bytes are read, and invert is ignored.
-//
-// Otherwise, if len(src) is not a multiple of 8 then the final byte written to
-// dst is padded with 1 bits (if invert is true) or 0 bits. If inverted, the 1s
-// are typically temporary, e.g. they will be flipped back to 0s by an
-// invertBytes call in the highBits caller, reader.Read.
-func highBits(dst []byte, src []byte, invert bool) (d int, s int) {
- // Pack as many complete groups of 8 src bytes as we can.
- n := len(src) / 8
- if n > len(dst) {
- n = len(dst)
- }
- dstN := dst[:n]
- for i := range dstN {
- src8 := src[i*8 : i*8+8]
- dstN[i] = ((src8[0] & 0x80) >> 0) |
- ((src8[1] & 0x80) >> 1) |
- ((src8[2] & 0x80) >> 2) |
- ((src8[3] & 0x80) >> 3) |
- ((src8[4] & 0x80) >> 4) |
- ((src8[5] & 0x80) >> 5) |
- ((src8[6] & 0x80) >> 6) |
- ((src8[7] & 0x80) >> 7)
- }
- d, s = n, 8*n
- dst, src = dst[d:], src[s:]
-
- // Pack up to 7 remaining src bytes, if there's room in dst.
- if (len(dst) > 0) && (len(src) > 0) {
- dstByte := byte(0)
- if invert {
- dstByte = 0xFF >> uint(len(src))
- }
- for n, srcByte := range src {
- dstByte |= (srcByte & 0x80) >> uint(n)
- }
- dst[0] = dstByte
- d, s = d+1, s+len(src)
- }
- return d, s
-}
-
-type bitReader struct {
- r io.Reader
-
- // readErr is the error returned from the most recent r.Read call. As the
- // io.Reader documentation says, when r.Read returns (n, err), "always
- // process the n > 0 bytes returned before considering the error err".
- readErr error
-
- // order is whether to process r's bytes LSB first or MSB first.
- order Order
-
- // The high nBits bits of the bits field hold upcoming bits in MSB order.
- bits uint64
- nBits uint32
-
- // bytes[br:bw] holds bytes read from r but not yet loaded into bits.
- br uint32
- bw uint32
- bytes [1024]uint8
-}
-
-func (b *bitReader) alignToByteBoundary() {
- n := b.nBits & 7
- b.bits <<= n
- b.nBits -= n
-}
-
-// nextBitMaxNBits is the maximum possible value of bitReader.nBits after a
-// bitReader.nextBit call, provided that bitReader.nBits was not more than this
-// value before that call.
-//
-// Note that the decode function can unread bits, which can temporarily set the
-// bitReader.nBits value above nextBitMaxNBits.
-const nextBitMaxNBits = 31
-
-func (b *bitReader) nextBit() (uint64, error) {
- for {
- if b.nBits > 0 {
- bit := b.bits >> 63
- b.bits <<= 1
- b.nBits--
- return bit, nil
- }
-
- if available := b.bw - b.br; available >= 4 {
- // Read 32 bits, even though b.bits is a uint64, since the decode
- // function may need to unread up to maxCodeLength bits, putting
- // them back in the remaining (64 - 32) bits. TestMaxCodeLength
- // checks that the generated maxCodeLength constant fits.
- //
- // If changing the Uint32 call, also change nextBitMaxNBits.
- b.bits = uint64(binary.BigEndian.Uint32(b.bytes[b.br:])) << 32
- b.br += 4
- b.nBits = 32
- continue
- } else if available > 0 {
- b.bits = uint64(b.bytes[b.br]) << (7 * 8)
- b.br++
- b.nBits = 8
- continue
- }
-
- if b.readErr != nil {
- return 0, b.readErr
- }
-
- n, err := b.r.Read(b.bytes[:])
- b.br = 0
- b.bw = uint32(n)
- b.readErr = err
-
- if b.order != MSB {
- reverseBitsWithinBytes(b.bytes[:b.bw])
- }
- }
-}
-
-func decode(b *bitReader, decodeTable [][2]int16) (uint32, error) {
- nBitsRead, bitsRead, state := uint32(0), uint64(0), int32(1)
- for {
- bit, err := b.nextBit()
- if err != nil {
- if err == io.EOF {
- err = errIncompleteCode
- }
- return 0, err
- }
- bitsRead |= bit << (63 - nBitsRead)
- nBitsRead++
-
- // The "&1" is redundant, but can eliminate a bounds check.
- state = int32(decodeTable[state][bit&1])
- if state < 0 {
- return uint32(^state), nil
- } else if state == 0 {
- // Unread the bits we've read, then return errInvalidCode.
- b.bits = (b.bits >> nBitsRead) | bitsRead
- b.nBits += nBitsRead
- return 0, errInvalidCode
- }
- }
-}
-
-// decodeEOL decodes the 12-bit EOL code 0000_0000_0001.
-func decodeEOL(b *bitReader) error {
- nBitsRead, bitsRead := uint32(0), uint64(0)
- for {
- bit, err := b.nextBit()
- if err != nil {
- if err == io.EOF {
- err = errMissingEOL
- }
- return err
- }
- bitsRead |= bit << (63 - nBitsRead)
- nBitsRead++
-
- if nBitsRead < 12 {
- if bit&1 == 0 {
- continue
- }
- } else if bit&1 != 0 {
- return nil
- }
-
- // Unread the bits we've read, then return errMissingEOL.
- b.bits = (b.bits >> nBitsRead) | bitsRead
- b.nBits += nBitsRead
- return errMissingEOL
- }
-}
-
-type reader struct {
- br bitReader
- subFormat SubFormat
-
- // width is the image width in pixels.
- width int
-
- // rowsRemaining starts at the image height in pixels, when the reader is
- // driven through the io.Reader interface, and decrements to zero as rows
- // are decoded. Alternatively, it may be negative if the image height is
- // not known in advance at the time of the NewReader call.
- //
- // When driven through DecodeIntoGray, this field is unused.
- rowsRemaining int
-
- // curr and prev hold the current and previous rows. Each element is either
- // 0x00 (black) or 0xFF (white).
- //
- // prev may be nil, when processing the first row.
- curr []byte
- prev []byte
-
- // ri is the read index. curr[:ri] are those bytes of curr that have been
- // passed along via the Read method.
- //
- // When the reader is driven through DecodeIntoGray, instead of through the
- // io.Reader interface, this field is unused.
- ri int
-
- // wi is the write index. curr[:wi] are those bytes of curr that have
- // already been decoded via the decodeRow method.
- //
- // What this implementation calls wi is roughly equivalent to what the spec
- // calls the a0 index.
- wi int
-
- // These fields are copied from the *Options (which may be nil).
- align bool
- invert bool
-
- // atStartOfRow is whether we have just started the row. Some parts of the
- // spec say to treat this situation as if "wi = -1".
- atStartOfRow bool
-
- // penColorIsWhite is whether the next run is black or white.
- penColorIsWhite bool
-
- // seenStartOfImage is whether we've called the startDecode method.
- seenStartOfImage bool
-
- // truncated is whether the input is missing the final 6 consecutive EOL's
- // (for Group3) or 2 consecutive EOL's (for Group4). Omitting that trailer
- // (but otherwise padding to a byte boundary, with either all 0 bits or all
- // 1 bits) is invalid according to the spec, but happens in practice when
- // exporting from Adobe Acrobat to TIFF + CCITT. This package silently
- // ignores the format error for CCITT input that has been truncated in that
- // fashion, returning the full decoded image.
- //
- // Detecting trailer truncation (just after the final row of pixels)
- // requires knowing which row is the final row, and therefore does not
- // trigger if the image height is not known in advance.
- truncated bool
-
- // readErr is a sticky error for the Read method.
- readErr error
-}
-
-func (z *reader) Read(p []byte) (int, error) {
- if z.readErr != nil {
- return 0, z.readErr
- }
- originalP := p
-
- for len(p) > 0 {
- // Allocate buffers (and decode any start-of-image codes), if
- // processing the first or second row.
- if z.curr == nil {
- if !z.seenStartOfImage {
- if z.readErr = z.startDecode(); z.readErr != nil {
- break
- }
- z.atStartOfRow = true
- }
- z.curr = make([]byte, z.width)
- }
-
- // Decode the next row, if necessary.
- if z.atStartOfRow {
- if z.rowsRemaining < 0 {
- // We do not know the image height in advance. See if the next
- // code is an EOL. If it is, it is consumed. If it isn't, the
- // bitReader shouldn't advance along the bit stream, and we
- // simply decode another row of pixel data.
- //
- // For the Group4 subFormat, we may need to align to a byte
- // boundary. For the Group3 subFormat, the previous z.decodeRow
- // call (or z.startDecode call) has already consumed one of the
- // 6 consecutive EOL's. The next EOL is actually the second of
- // 6, in the middle, and we shouldn't align at that point.
- if z.align && (z.subFormat == Group4) {
- z.br.alignToByteBoundary()
- }
-
- if err := z.decodeEOL(); err == errMissingEOL {
- // No-op. It's another row of pixel data.
- } else if err != nil {
- z.readErr = err
- break
- } else {
- if z.readErr = z.finishDecode(true); z.readErr != nil {
- break
- }
- z.readErr = io.EOF
- break
- }
-
- } else if z.rowsRemaining == 0 {
- // We do know the image height in advance, and we have already
- // decoded exactly that many rows.
- if z.readErr = z.finishDecode(false); z.readErr != nil {
- break
- }
- z.readErr = io.EOF
- break
-
- } else {
- z.rowsRemaining--
- }
-
- if z.readErr = z.decodeRow(z.rowsRemaining == 0); z.readErr != nil {
- break
- }
- }
-
- // Pack from z.curr (1 byte per pixel) to p (1 bit per pixel).
- packD, packS := highBits(p, z.curr[z.ri:], z.invert)
- p = p[packD:]
- z.ri += packS
-
- // Prepare to decode the next row, if necessary.
- if z.ri == len(z.curr) {
- z.ri, z.curr, z.prev = 0, z.prev, z.curr
- z.atStartOfRow = true
- }
- }
-
- n := len(originalP) - len(p)
- if z.invert {
- invertBytes(originalP[:n])
- }
- return n, z.readErr
-}
-
-func (z *reader) penColor() byte {
- if z.penColorIsWhite {
- return 0xFF
- }
- return 0x00
-}
-
-func (z *reader) startDecode() error {
- switch z.subFormat {
- case Group3:
- if err := z.decodeEOL(); err != nil {
- return err
- }
-
- case Group4:
- // No-op.
-
- default:
- return errUnsupportedSubFormat
- }
-
- z.seenStartOfImage = true
- return nil
-}
-
-func (z *reader) finishDecode(alreadySeenEOL bool) error {
- numberOfEOLs := 0
- switch z.subFormat {
- case Group3:
- if z.truncated {
- return nil
- }
- // The stream ends with a RTC (Return To Control) of 6 consecutive
- // EOL's, but we should have already just seen an EOL, either in
- // z.startDecode (for a zero-height image) or in z.decodeRow.
- numberOfEOLs = 5
-
- case Group4:
- autoDetectHeight := z.rowsRemaining < 0
- if autoDetectHeight {
- // Aligning to a byte boundary was already handled by reader.Read.
- } else if z.align {
- z.br.alignToByteBoundary()
- }
- // The stream ends with two EOL's. If the first one is missing, and we
- // had an explicit image height, we just assume that the trailing two
- // EOL's were truncated and return a nil error.
- if err := z.decodeEOL(); err != nil {
- if (err == errMissingEOL) && !autoDetectHeight {
- z.truncated = true
- return nil
- }
- return err
- }
- numberOfEOLs = 1
-
- default:
- return errUnsupportedSubFormat
- }
-
- if alreadySeenEOL {
- numberOfEOLs--
- }
- for ; numberOfEOLs > 0; numberOfEOLs-- {
- if err := z.decodeEOL(); err != nil {
- return err
- }
- }
- return nil
-}
-
-func (z *reader) decodeEOL() error {
- return decodeEOL(&z.br)
-}
-
-func (z *reader) decodeRow(finalRow bool) error {
- z.wi = 0
- z.atStartOfRow = true
- z.penColorIsWhite = true
-
- if z.align {
- z.br.alignToByteBoundary()
- }
-
- switch z.subFormat {
- case Group3:
- for ; z.wi < len(z.curr); z.atStartOfRow = false {
- if err := z.decodeRun(); err != nil {
- return err
- }
- }
- err := z.decodeEOL()
- if finalRow && (err == errMissingEOL) {
- z.truncated = true
- return nil
- }
- return err
-
- case Group4:
- for ; z.wi < len(z.curr); z.atStartOfRow = false {
- mode, err := decode(&z.br, modeDecodeTable[:])
- if err != nil {
- return err
- }
- rm := readerMode{}
- if mode < uint32(len(readerModes)) {
- rm = readerModes[mode]
- }
- if rm.function == nil {
- return errInvalidMode
- }
- if err := rm.function(z, rm.arg); err != nil {
- return err
- }
- }
- return nil
- }
-
- return errUnsupportedSubFormat
-}
-
-func (z *reader) decodeRun() error {
- table := blackDecodeTable[:]
- if z.penColorIsWhite {
- table = whiteDecodeTable[:]
- }
-
- total := 0
- for {
- n, err := decode(&z.br, table)
- if err != nil {
- return err
- }
- if n > maxWidth {
- panic("unreachable")
- }
- total += int(n)
- if total > maxWidth {
- return errRunLengthTooLong
- }
- // Anything 0x3F or below is a terminal code.
- if n <= 0x3F {
- break
- }
- }
-
- if total > (len(z.curr) - z.wi) {
- return errRunLengthOverflowsWidth
- }
- dst := z.curr[z.wi : z.wi+total]
- penColor := z.penColor()
- for i := range dst {
- dst[i] = penColor
- }
- z.wi += total
- z.penColorIsWhite = !z.penColorIsWhite
-
- return nil
-}
-
-// The various modes' semantics are based on determining a row of pixels'
-// "changing elements": those pixels whose color differs from the one on its
-// immediate left.
-//
-// The row above the first row is implicitly all white. Similarly, the column
-// to the left of the first column is implicitly all white.
-//
-// For example, here's Figure 1 in "ITU-T Recommendation T.6", where the
-// current and previous rows contain black (B) and white (w) pixels. The a?
-// indexes point into curr, the b? indexes point into prev.
-//
-// b1 b2
-// v v
-// prev: BBBBBwwwwwBBBwwwww
-// curr: BBBwwwwwBBBBBBwwww
-// ^ ^ ^
-// a0 a1 a2
-//
-// a0 is the "reference element" or current decoder position, roughly
-// equivalent to what this implementation calls reader.wi.
-//
-// a1 is the next changing element to the right of a0, on the "coding line"
-// (the current row).
-//
-// a2 is the next changing element to the right of a1, again on curr.
-//
-// b1 is the first changing element on the "reference line" (the previous row)
-// to the right of a0 and of opposite color to a0.
-//
-// b2 is the next changing element to the right of b1, again on prev.
-//
-// The various modes calculate a1 (and a2, for modeH):
-// - modePass calculates that a1 is at or to the right of b2.
-// - modeH calculates a1 and a2 without considering b1 or b2.
-// - modeV* calculates a1 to be b1 plus an adjustment (between -3 and +3).
-
-const (
- findB1 = false
- findB2 = true
-)
-
-// findB finds either the b1 or b2 value.
-func (z *reader) findB(whichB bool) int {
- // The initial row is a special case. The previous row is implicitly all
- // white, so that there are no changing pixel elements. We return b1 or b2
- // to be at the end of the row.
- if len(z.prev) != len(z.curr) {
- return len(z.curr)
- }
-
- i := z.wi
-
- if z.atStartOfRow {
- // a0 is implicitly at -1, on a white pixel. b1 is the first black
- // pixel in the previous row. b2 is the first white pixel after that.
- for ; (i < len(z.prev)) && (z.prev[i] == 0xFF); i++ {
- }
- if whichB == findB2 {
- for ; (i < len(z.prev)) && (z.prev[i] == 0x00); i++ {
- }
- }
- return i
- }
-
- // As per figure 1 above, assume that the current pen color is white.
- // First, walk past every contiguous black pixel in prev, starting at a0.
- oppositeColor := ^z.penColor()
- for ; (i < len(z.prev)) && (z.prev[i] == oppositeColor); i++ {
- }
-
- // Then walk past every contiguous white pixel.
- penColor := ^oppositeColor
- for ; (i < len(z.prev)) && (z.prev[i] == penColor); i++ {
- }
-
- // We're now at a black pixel (or at the end of the row). That's b1.
- if whichB == findB2 {
- // If we're looking for b2, walk past every contiguous black pixel
- // again.
- oppositeColor := ^penColor
- for ; (i < len(z.prev)) && (z.prev[i] == oppositeColor); i++ {
- }
- }
-
- return i
-}
-
-type readerMode struct {
- function func(z *reader, arg int) error
- arg int
-}
-
-var readerModes = [...]readerMode{
- modePass: {function: readerModePass},
- modeH: {function: readerModeH},
- modeV0: {function: readerModeV, arg: +0},
- modeVR1: {function: readerModeV, arg: +1},
- modeVR2: {function: readerModeV, arg: +2},
- modeVR3: {function: readerModeV, arg: +3},
- modeVL1: {function: readerModeV, arg: -1},
- modeVL2: {function: readerModeV, arg: -2},
- modeVL3: {function: readerModeV, arg: -3},
- modeExt: {function: readerModeExt},
-}
-
-func readerModePass(z *reader, arg int) error {
- b2 := z.findB(findB2)
- if (b2 < z.wi) || (len(z.curr) < b2) {
- return errInvalidOffset
- }
- dst := z.curr[z.wi:b2]
- penColor := z.penColor()
- for i := range dst {
- dst[i] = penColor
- }
- z.wi = b2
- return nil
-}
-
-func readerModeH(z *reader, arg int) error {
- // The first iteration finds a1. The second finds a2.
- for i := 0; i < 2; i++ {
- if err := z.decodeRun(); err != nil {
- return err
- }
- }
- return nil
-}
-
-func readerModeV(z *reader, arg int) error {
- a1 := z.findB(findB1) + arg
- if (a1 < z.wi) || (len(z.curr) < a1) {
- return errInvalidOffset
- }
- dst := z.curr[z.wi:a1]
- penColor := z.penColor()
- for i := range dst {
- dst[i] = penColor
- }
- z.wi = a1
- z.penColorIsWhite = !z.penColorIsWhite
- return nil
-}
-
-func readerModeExt(z *reader, arg int) error {
- return errUnsupportedMode
-}
-
-// DecodeIntoGray decodes the CCITT-formatted data in r into dst.
-//
-// It returns an error if dst's width and height don't match the implied width
-// and height of CCITT-formatted data.
-func DecodeIntoGray(dst *image.Gray, r io.Reader, order Order, sf SubFormat, opts *Options) error {
- bounds := dst.Bounds()
- if (bounds.Dx() < 0) || (bounds.Dy() < 0) {
- return errInvalidBounds
- }
- if bounds.Dx() > maxWidth {
- return errUnsupportedWidth
- }
-
- z := reader{
- br: bitReader{r: r, order: order},
- subFormat: sf,
- align: (opts != nil) && opts.Align,
- invert: (opts != nil) && opts.Invert,
- width: bounds.Dx(),
- }
- if err := z.startDecode(); err != nil {
- return err
- }
-
- width := bounds.Dx()
- for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
- p := (y - bounds.Min.Y) * dst.Stride
- z.curr = dst.Pix[p : p+width]
- if err := z.decodeRow(y+1 == bounds.Max.Y); err != nil {
- return err
- }
- z.curr, z.prev = nil, z.curr
- }
-
- if err := z.finishDecode(false); err != nil {
- return err
- }
-
- if z.invert {
- for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
- p := (y - bounds.Min.Y) * dst.Stride
- invertBytes(dst.Pix[p : p+width])
- }
- }
-
- return nil
-}
-
-// NewReader returns an io.Reader that decodes the CCITT-formatted data in r.
-// The resultant byte stream is one bit per pixel (MSB first), with 1 meaning
-// white and 0 meaning black. Each row in the result is byte-aligned.
-//
-// A negative height, such as passing AutoDetectHeight, means that the image
-// height is not known in advance. A negative width is invalid.
-func NewReader(r io.Reader, order Order, sf SubFormat, width int, height int, opts *Options) io.Reader {
- readErr := error(nil)
- if width < 0 {
- readErr = errInvalidBounds
- } else if width > maxWidth {
- readErr = errUnsupportedWidth
- }
-
- return &reader{
- br: bitReader{r: r, order: order},
- subFormat: sf,
- align: (opts != nil) && opts.Align,
- invert: (opts != nil) && opts.Invert,
- width: width,
- rowsRemaining: height,
- readErr: readErr,
- }
-}
diff --git a/vendor/golang.org/x/image/ccitt/table.go b/vendor/golang.org/x/image/ccitt/table.go
deleted file mode 100644
index ef7ea9d4..00000000
--- a/vendor/golang.org/x/image/ccitt/table.go
+++ /dev/null
@@ -1,972 +0,0 @@
-// generated by "go run gen.go". DO NOT EDIT.
-
-package ccitt
-
-// Each decodeTable is represented by an array of [2]int16's: a binary tree.
-// Each array element (other than element 0, which means invalid) is a branch
-// node in that tree. The root node is always element 1 (the second element).
-//
-// To walk the tree, look at the next bit in the bit stream, using it to select
-// the first or second element of the [2]int16. If that int16 is 0, we have an
-// invalid code. If it is positive, go to that branch node. If it is negative,
-// then we have a leaf node, whose value is the bitwise complement (the ^
-// operator) of that int16.
-//
-// Comments above each decodeTable also show the same structure visually. The
-// "b123" lines show the 123'rd branch node. The "=XXXXX" lines show an invalid
-// code. The "=v1234" lines show a leaf node with value 1234. When reading the
-// bit stream, a 0 or 1 bit means to go up or down, as you move left to right.
-//
-// For example, in modeDecodeTable, branch node b005 is three steps up from the
-// root node, meaning that we have already seen "000". If the next bit is "0"
-// then we move to branch node b006. Otherwise, the next bit is "1", and we
-// move to the leaf node v0000 (also known as the modePass constant). Indeed,
-// the bits that encode modePass are "0001".
-//
-// Tables 1, 2 and 3 come from the "ITU-T Recommendation T.6: FACSIMILE CODING
-// SCHEMES AND CODING CONTROL FUNCTIONS FOR GROUP 4 FACSIMILE APPARATUS"
-// specification:
-//
-// https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-T.6-198811-I!!PDF-E&type=items
-
-// modeDecodeTable represents Table 1 and the End-of-Line code.
-//
-// +=XXXXX
-// b009 +-+
-// | +=v0009
-// b007 +-+
-// | | +=v0008
-// b010 | +-+
-// | +=v0005
-// b006 +-+
-// | | +=v0007
-// b008 | +-+
-// | +=v0004
-// b005 +-+
-// | +=v0000
-// b003 +-+
-// | +=v0001
-// b002 +-+
-// | | +=v0006
-// b004 | +-+
-// | +=v0003
-// b001 +-+
-// +=v0002
-var modeDecodeTable = [...][2]int16{
- 0: {0, 0},
- 1: {2, ^2},
- 2: {3, 4},
- 3: {5, ^1},
- 4: {^6, ^3},
- 5: {6, ^0},
- 6: {7, 8},
- 7: {9, 10},
- 8: {^7, ^4},
- 9: {0, ^9},
- 10: {^8, ^5},
-}
-
-// whiteDecodeTable represents Tables 2 and 3 for a white run.
-//
-// +=XXXXX
-// b059 +-+
-// | | +=v1792
-// b096 | | +-+
-// | | | | +=v1984
-// b100 | | | +-+
-// | | | +=v2048
-// b094 | | +-+
-// | | | | +=v2112
-// b101 | | | | +-+
-// | | | | | +=v2176
-// b097 | | | +-+
-// | | | | +=v2240
-// b102 | | | +-+
-// | | | +=v2304
-// b085 | +-+
-// | | +=v1856
-// b098 | | +-+
-// | | | +=v1920
-// b095 | +-+
-// | | +=v2368
-// b103 | | +-+
-// | | | +=v2432
-// b099 | +-+
-// | | +=v2496
-// b104 | +-+
-// | +=v2560
-// b040 +-+
-// | | +=v0029
-// b060 | +-+
-// | +=v0030
-// b026 +-+
-// | | +=v0045
-// b061 | | +-+
-// | | | +=v0046
-// b041 | +-+
-// | +=v0022
-// b016 +-+
-// | | +=v0023
-// b042 | | +-+
-// | | | | +=v0047
-// b062 | | | +-+
-// | | | +=v0048
-// b027 | +-+
-// | +=v0013
-// b008 +-+
-// | | +=v0020
-// b043 | | +-+
-// | | | | +=v0033
-// b063 | | | +-+
-// | | | +=v0034
-// b028 | | +-+
-// | | | | +=v0035
-// b064 | | | | +-+
-// | | | | | +=v0036
-// b044 | | | +-+
-// | | | | +=v0037
-// b065 | | | +-+
-// | | | +=v0038
-// b017 | +-+
-// | | +=v0019
-// b045 | | +-+
-// | | | | +=v0031
-// b066 | | | +-+
-// | | | +=v0032
-// b029 | +-+
-// | +=v0001
-// b004 +-+
-// | | +=v0012
-// b030 | | +-+
-// | | | | +=v0053
-// b067 | | | | +-+
-// | | | | | +=v0054
-// b046 | | | +-+
-// | | | +=v0026
-// b018 | | +-+
-// | | | | +=v0039
-// b068 | | | | +-+
-// | | | | | +=v0040
-// b047 | | | | +-+
-// | | | | | | +=v0041
-// b069 | | | | | +-+
-// | | | | | +=v0042
-// b031 | | | +-+
-// | | | | +=v0043
-// b070 | | | | +-+
-// | | | | | +=v0044
-// b048 | | | +-+
-// | | | +=v0021
-// b009 | +-+
-// | | +=v0028
-// b049 | | +-+
-// | | | | +=v0061
-// b071 | | | +-+
-// | | | +=v0062
-// b032 | | +-+
-// | | | | +=v0063
-// b072 | | | | +-+
-// | | | | | +=v0000
-// b050 | | | +-+
-// | | | | +=v0320
-// b073 | | | +-+
-// | | | +=v0384
-// b019 | +-+
-// | +=v0010
-// b002 +-+
-// | | +=v0011
-// b020 | | +-+
-// | | | | +=v0027
-// b051 | | | | +-+
-// | | | | | | +=v0059
-// b074 | | | | | +-+
-// | | | | | +=v0060
-// b033 | | | +-+
-// | | | | +=v1472
-// b086 | | | | +-+
-// | | | | | +=v1536
-// b075 | | | | +-+
-// | | | | | | +=v1600
-// b087 | | | | | +-+
-// | | | | | +=v1728
-// b052 | | | +-+
-// | | | +=v0018
-// b010 | | +-+
-// | | | | +=v0024
-// b053 | | | | +-+
-// | | | | | | +=v0049
-// b076 | | | | | +-+
-// | | | | | +=v0050
-// b034 | | | | +-+
-// | | | | | | +=v0051
-// b077 | | | | | | +-+
-// | | | | | | | +=v0052
-// b054 | | | | | +-+
-// | | | | | +=v0025
-// b021 | | | +-+
-// | | | | +=v0055
-// b078 | | | | +-+
-// | | | | | +=v0056
-// b055 | | | | +-+
-// | | | | | | +=v0057
-// b079 | | | | | +-+
-// | | | | | +=v0058
-// b035 | | | +-+
-// | | | +=v0192
-// b005 | +-+
-// | | +=v1664
-// b036 | | +-+
-// | | | | +=v0448
-// b080 | | | | +-+
-// | | | | | +=v0512
-// b056 | | | +-+
-// | | | | +=v0704
-// b088 | | | | +-+
-// | | | | | +=v0768
-// b081 | | | +-+
-// | | | +=v0640
-// b022 | | +-+
-// | | | | +=v0576
-// b082 | | | | +-+
-// | | | | | | +=v0832
-// b089 | | | | | +-+
-// | | | | | +=v0896
-// b057 | | | | +-+
-// | | | | | | +=v0960
-// b090 | | | | | | +-+
-// | | | | | | | +=v1024
-// b083 | | | | | +-+
-// | | | | | | +=v1088
-// b091 | | | | | +-+
-// | | | | | +=v1152
-// b037 | | | +-+
-// | | | | +=v1216
-// b092 | | | | +-+
-// | | | | | +=v1280
-// b084 | | | | +-+
-// | | | | | | +=v1344
-// b093 | | | | | +-+
-// | | | | | +=v1408
-// b058 | | | +-+
-// | | | +=v0256
-// b011 | +-+
-// | +=v0002
-// b001 +-+
-// | +=v0003
-// b012 | +-+
-// | | | +=v0128
-// b023 | | +-+
-// | | +=v0008
-// b006 | +-+
-// | | | +=v0009
-// b024 | | | +-+
-// | | | | | +=v0016
-// b038 | | | | +-+
-// | | | | +=v0017
-// b013 | | +-+
-// | | +=v0004
-// b003 +-+
-// | +=v0005
-// b014 | +-+
-// | | | +=v0014
-// b039 | | | +-+
-// | | | | +=v0015
-// b025 | | +-+
-// | | +=v0064
-// b007 +-+
-// | +=v0006
-// b015 +-+
-// +=v0007
-var whiteDecodeTable = [...][2]int16{
- 0: {0, 0},
- 1: {2, 3},
- 2: {4, 5},
- 3: {6, 7},
- 4: {8, 9},
- 5: {10, 11},
- 6: {12, 13},
- 7: {14, 15},
- 8: {16, 17},
- 9: {18, 19},
- 10: {20, 21},
- 11: {22, ^2},
- 12: {^3, 23},
- 13: {24, ^4},
- 14: {^5, 25},
- 15: {^6, ^7},
- 16: {26, 27},
- 17: {28, 29},
- 18: {30, 31},
- 19: {32, ^10},
- 20: {^11, 33},
- 21: {34, 35},
- 22: {36, 37},
- 23: {^128, ^8},
- 24: {^9, 38},
- 25: {39, ^64},
- 26: {40, 41},
- 27: {42, ^13},
- 28: {43, 44},
- 29: {45, ^1},
- 30: {^12, 46},
- 31: {47, 48},
- 32: {49, 50},
- 33: {51, 52},
- 34: {53, 54},
- 35: {55, ^192},
- 36: {^1664, 56},
- 37: {57, 58},
- 38: {^16, ^17},
- 39: {^14, ^15},
- 40: {59, 60},
- 41: {61, ^22},
- 42: {^23, 62},
- 43: {^20, 63},
- 44: {64, 65},
- 45: {^19, 66},
- 46: {67, ^26},
- 47: {68, 69},
- 48: {70, ^21},
- 49: {^28, 71},
- 50: {72, 73},
- 51: {^27, 74},
- 52: {75, ^18},
- 53: {^24, 76},
- 54: {77, ^25},
- 55: {78, 79},
- 56: {80, 81},
- 57: {82, 83},
- 58: {84, ^256},
- 59: {0, 85},
- 60: {^29, ^30},
- 61: {^45, ^46},
- 62: {^47, ^48},
- 63: {^33, ^34},
- 64: {^35, ^36},
- 65: {^37, ^38},
- 66: {^31, ^32},
- 67: {^53, ^54},
- 68: {^39, ^40},
- 69: {^41, ^42},
- 70: {^43, ^44},
- 71: {^61, ^62},
- 72: {^63, ^0},
- 73: {^320, ^384},
- 74: {^59, ^60},
- 75: {86, 87},
- 76: {^49, ^50},
- 77: {^51, ^52},
- 78: {^55, ^56},
- 79: {^57, ^58},
- 80: {^448, ^512},
- 81: {88, ^640},
- 82: {^576, 89},
- 83: {90, 91},
- 84: {92, 93},
- 85: {94, 95},
- 86: {^1472, ^1536},
- 87: {^1600, ^1728},
- 88: {^704, ^768},
- 89: {^832, ^896},
- 90: {^960, ^1024},
- 91: {^1088, ^1152},
- 92: {^1216, ^1280},
- 93: {^1344, ^1408},
- 94: {96, 97},
- 95: {98, 99},
- 96: {^1792, 100},
- 97: {101, 102},
- 98: {^1856, ^1920},
- 99: {103, 104},
- 100: {^1984, ^2048},
- 101: {^2112, ^2176},
- 102: {^2240, ^2304},
- 103: {^2368, ^2432},
- 104: {^2496, ^2560},
-}
-
-// blackDecodeTable represents Tables 2 and 3 for a black run.
-//
-// +=XXXXX
-// b017 +-+
-// | | +=v1792
-// b042 | | +-+
-// | | | | +=v1984
-// b063 | | | +-+
-// | | | +=v2048
-// b029 | | +-+
-// | | | | +=v2112
-// b064 | | | | +-+
-// | | | | | +=v2176
-// b043 | | | +-+
-// | | | | +=v2240
-// b065 | | | +-+
-// | | | +=v2304
-// b022 | +-+
-// | | +=v1856
-// b044 | | +-+
-// | | | +=v1920
-// b030 | +-+
-// | | +=v2368
-// b066 | | +-+
-// | | | +=v2432
-// b045 | +-+
-// | | +=v2496
-// b067 | +-+
-// | +=v2560
-// b013 +-+
-// | | +=v0018
-// b031 | | +-+
-// | | | | +=v0052
-// b068 | | | | +-+
-// | | | | | | +=v0640
-// b095 | | | | | +-+
-// | | | | | +=v0704
-// b046 | | | +-+
-// | | | | +=v0768
-// b096 | | | | +-+
-// | | | | | +=v0832
-// b069 | | | +-+
-// | | | +=v0055
-// b023 | | +-+
-// | | | | +=v0056
-// b070 | | | | +-+
-// | | | | | | +=v1280
-// b097 | | | | | +-+
-// | | | | | +=v1344
-// b047 | | | | +-+
-// | | | | | | +=v1408
-// b098 | | | | | | +-+
-// | | | | | | | +=v1472
-// b071 | | | | | +-+
-// | | | | | +=v0059
-// b032 | | | +-+
-// | | | | +=v0060
-// b072 | | | | +-+
-// | | | | | | +=v1536
-// b099 | | | | | +-+
-// | | | | | +=v1600
-// b048 | | | +-+
-// | | | +=v0024
-// b018 | +-+
-// | | +=v0025
-// b049 | | +-+
-// | | | | +=v1664
-// b100 | | | | +-+
-// | | | | | +=v1728
-// b073 | | | +-+
-// | | | +=v0320
-// b033 | | +-+
-// | | | | +=v0384
-// b074 | | | | +-+
-// | | | | | +=v0448
-// b050 | | | +-+
-// | | | | +=v0512
-// b101 | | | | +-+
-// | | | | | +=v0576
-// b075 | | | +-+
-// | | | +=v0053
-// b024 | +-+
-// | | +=v0054
-// b076 | | +-+
-// | | | | +=v0896
-// b102 | | | +-+
-// | | | +=v0960
-// b051 | | +-+
-// | | | | +=v1024
-// b103 | | | | +-+
-// | | | | | +=v1088
-// b077 | | | +-+
-// | | | | +=v1152
-// b104 | | | +-+
-// | | | +=v1216
-// b034 | +-+
-// | +=v0064
-// b010 +-+
-// | | +=v0013
-// b019 | | +-+
-// | | | | +=v0023
-// b052 | | | | +-+
-// | | | | | | +=v0050
-// b078 | | | | | +-+
-// | | | | | +=v0051
-// b035 | | | | +-+
-// | | | | | | +=v0044
-// b079 | | | | | | +-+
-// | | | | | | | +=v0045
-// b053 | | | | | +-+
-// | | | | | | +=v0046
-// b080 | | | | | +-+
-// | | | | | +=v0047
-// b025 | | | +-+
-// | | | | +=v0057
-// b081 | | | | +-+
-// | | | | | +=v0058
-// b054 | | | | +-+
-// | | | | | | +=v0061
-// b082 | | | | | +-+
-// | | | | | +=v0256
-// b036 | | | +-+
-// | | | +=v0016
-// b014 | +-+
-// | | +=v0017
-// b037 | | +-+
-// | | | | +=v0048
-// b083 | | | | +-+
-// | | | | | +=v0049
-// b055 | | | +-+
-// | | | | +=v0062
-// b084 | | | +-+
-// | | | +=v0063
-// b026 | | +-+
-// | | | | +=v0030
-// b085 | | | | +-+
-// | | | | | +=v0031
-// b056 | | | | +-+
-// | | | | | | +=v0032
-// b086 | | | | | +-+
-// | | | | | +=v0033
-// b038 | | | +-+
-// | | | | +=v0040
-// b087 | | | | +-+
-// | | | | | +=v0041
-// b057 | | | +-+
-// | | | +=v0022
-// b020 | +-+
-// | +=v0014
-// b008 +-+
-// | | +=v0010
-// b015 | | +-+
-// | | | +=v0011
-// b011 | +-+
-// | | +=v0015
-// b027 | | +-+
-// | | | | +=v0128
-// b088 | | | | +-+
-// | | | | | +=v0192
-// b058 | | | | +-+
-// | | | | | | +=v0026
-// b089 | | | | | +-+
-// | | | | | +=v0027
-// b039 | | | +-+
-// | | | | +=v0028
-// b090 | | | | +-+
-// | | | | | +=v0029
-// b059 | | | +-+
-// | | | +=v0019
-// b021 | | +-+
-// | | | | +=v0020
-// b060 | | | | +-+
-// | | | | | | +=v0034
-// b091 | | | | | +-+
-// | | | | | +=v0035
-// b040 | | | | +-+
-// | | | | | | +=v0036
-// b092 | | | | | | +-+
-// | | | | | | | +=v0037
-// b061 | | | | | +-+
-// | | | | | | +=v0038
-// b093 | | | | | +-+
-// | | | | | +=v0039
-// b028 | | | +-+
-// | | | | +=v0021
-// b062 | | | | +-+
-// | | | | | | +=v0042
-// b094 | | | | | +-+
-// | | | | | +=v0043
-// b041 | | | +-+
-// | | | +=v0000
-// b016 | +-+
-// | +=v0012
-// b006 +-+
-// | | +=v0009
-// b012 | | +-+
-// | | | +=v0008
-// b009 | +-+
-// | +=v0007
-// b004 +-+
-// | | +=v0006
-// b007 | +-+
-// | +=v0005
-// b002 +-+
-// | | +=v0001
-// b005 | +-+
-// | +=v0004
-// b001 +-+
-// | +=v0003
-// b003 +-+
-// +=v0002
-var blackDecodeTable = [...][2]int16{
- 0: {0, 0},
- 1: {2, 3},
- 2: {4, 5},
- 3: {^3, ^2},
- 4: {6, 7},
- 5: {^1, ^4},
- 6: {8, 9},
- 7: {^6, ^5},
- 8: {10, 11},
- 9: {12, ^7},
- 10: {13, 14},
- 11: {15, 16},
- 12: {^9, ^8},
- 13: {17, 18},
- 14: {19, 20},
- 15: {^10, ^11},
- 16: {21, ^12},
- 17: {0, 22},
- 18: {23, 24},
- 19: {^13, 25},
- 20: {26, ^14},
- 21: {27, 28},
- 22: {29, 30},
- 23: {31, 32},
- 24: {33, 34},
- 25: {35, 36},
- 26: {37, 38},
- 27: {^15, 39},
- 28: {40, 41},
- 29: {42, 43},
- 30: {44, 45},
- 31: {^18, 46},
- 32: {47, 48},
- 33: {49, 50},
- 34: {51, ^64},
- 35: {52, 53},
- 36: {54, ^16},
- 37: {^17, 55},
- 38: {56, 57},
- 39: {58, 59},
- 40: {60, 61},
- 41: {62, ^0},
- 42: {^1792, 63},
- 43: {64, 65},
- 44: {^1856, ^1920},
- 45: {66, 67},
- 46: {68, 69},
- 47: {70, 71},
- 48: {72, ^24},
- 49: {^25, 73},
- 50: {74, 75},
- 51: {76, 77},
- 52: {^23, 78},
- 53: {79, 80},
- 54: {81, 82},
- 55: {83, 84},
- 56: {85, 86},
- 57: {87, ^22},
- 58: {88, 89},
- 59: {90, ^19},
- 60: {^20, 91},
- 61: {92, 93},
- 62: {^21, 94},
- 63: {^1984, ^2048},
- 64: {^2112, ^2176},
- 65: {^2240, ^2304},
- 66: {^2368, ^2432},
- 67: {^2496, ^2560},
- 68: {^52, 95},
- 69: {96, ^55},
- 70: {^56, 97},
- 71: {98, ^59},
- 72: {^60, 99},
- 73: {100, ^320},
- 74: {^384, ^448},
- 75: {101, ^53},
- 76: {^54, 102},
- 77: {103, 104},
- 78: {^50, ^51},
- 79: {^44, ^45},
- 80: {^46, ^47},
- 81: {^57, ^58},
- 82: {^61, ^256},
- 83: {^48, ^49},
- 84: {^62, ^63},
- 85: {^30, ^31},
- 86: {^32, ^33},
- 87: {^40, ^41},
- 88: {^128, ^192},
- 89: {^26, ^27},
- 90: {^28, ^29},
- 91: {^34, ^35},
- 92: {^36, ^37},
- 93: {^38, ^39},
- 94: {^42, ^43},
- 95: {^640, ^704},
- 96: {^768, ^832},
- 97: {^1280, ^1344},
- 98: {^1408, ^1472},
- 99: {^1536, ^1600},
- 100: {^1664, ^1728},
- 101: {^512, ^576},
- 102: {^896, ^960},
- 103: {^1024, ^1088},
- 104: {^1152, ^1216},
-}
-
-const maxCodeLength = 13
-
-// Each encodeTable is represented by an array of bitStrings.
-
-// bitString is a pair of uint32 values representing a bit code.
-// The nBits low bits of bits make up the actual bit code.
-// Eg. bitString{0x0004, 8} represents the bitcode "00000100".
-type bitString struct {
- bits uint32
- nBits uint32
-}
-
-// modeEncodeTable represents Table 1 and the End-of-Line code.
-var modeEncodeTable = [...]bitString{
- 0: {0x0001, 4}, // "0001"
- 1: {0x0001, 3}, // "001"
- 2: {0x0001, 1}, // "1"
- 3: {0x0003, 3}, // "011"
- 4: {0x0003, 6}, // "000011"
- 5: {0x0003, 7}, // "0000011"
- 6: {0x0002, 3}, // "010"
- 7: {0x0002, 6}, // "000010"
- 8: {0x0002, 7}, // "0000010"
- 9: {0x0001, 7}, // "0000001"
-}
-
-// whiteEncodeTable2 represents Table 2 for a white run.
-var whiteEncodeTable2 = [...]bitString{
- 0: {0x0035, 8}, // "00110101"
- 1: {0x0007, 6}, // "000111"
- 2: {0x0007, 4}, // "0111"
- 3: {0x0008, 4}, // "1000"
- 4: {0x000b, 4}, // "1011"
- 5: {0x000c, 4}, // "1100"
- 6: {0x000e, 4}, // "1110"
- 7: {0x000f, 4}, // "1111"
- 8: {0x0013, 5}, // "10011"
- 9: {0x0014, 5}, // "10100"
- 10: {0x0007, 5}, // "00111"
- 11: {0x0008, 5}, // "01000"
- 12: {0x0008, 6}, // "001000"
- 13: {0x0003, 6}, // "000011"
- 14: {0x0034, 6}, // "110100"
- 15: {0x0035, 6}, // "110101"
- 16: {0x002a, 6}, // "101010"
- 17: {0x002b, 6}, // "101011"
- 18: {0x0027, 7}, // "0100111"
- 19: {0x000c, 7}, // "0001100"
- 20: {0x0008, 7}, // "0001000"
- 21: {0x0017, 7}, // "0010111"
- 22: {0x0003, 7}, // "0000011"
- 23: {0x0004, 7}, // "0000100"
- 24: {0x0028, 7}, // "0101000"
- 25: {0x002b, 7}, // "0101011"
- 26: {0x0013, 7}, // "0010011"
- 27: {0x0024, 7}, // "0100100"
- 28: {0x0018, 7}, // "0011000"
- 29: {0x0002, 8}, // "00000010"
- 30: {0x0003, 8}, // "00000011"
- 31: {0x001a, 8}, // "00011010"
- 32: {0x001b, 8}, // "00011011"
- 33: {0x0012, 8}, // "00010010"
- 34: {0x0013, 8}, // "00010011"
- 35: {0x0014, 8}, // "00010100"
- 36: {0x0015, 8}, // "00010101"
- 37: {0x0016, 8}, // "00010110"
- 38: {0x0017, 8}, // "00010111"
- 39: {0x0028, 8}, // "00101000"
- 40: {0x0029, 8}, // "00101001"
- 41: {0x002a, 8}, // "00101010"
- 42: {0x002b, 8}, // "00101011"
- 43: {0x002c, 8}, // "00101100"
- 44: {0x002d, 8}, // "00101101"
- 45: {0x0004, 8}, // "00000100"
- 46: {0x0005, 8}, // "00000101"
- 47: {0x000a, 8}, // "00001010"
- 48: {0x000b, 8}, // "00001011"
- 49: {0x0052, 8}, // "01010010"
- 50: {0x0053, 8}, // "01010011"
- 51: {0x0054, 8}, // "01010100"
- 52: {0x0055, 8}, // "01010101"
- 53: {0x0024, 8}, // "00100100"
- 54: {0x0025, 8}, // "00100101"
- 55: {0x0058, 8}, // "01011000"
- 56: {0x0059, 8}, // "01011001"
- 57: {0x005a, 8}, // "01011010"
- 58: {0x005b, 8}, // "01011011"
- 59: {0x004a, 8}, // "01001010"
- 60: {0x004b, 8}, // "01001011"
- 61: {0x0032, 8}, // "00110010"
- 62: {0x0033, 8}, // "00110011"
- 63: {0x0034, 8}, // "00110100"
-}
-
-// whiteEncodeTable3 represents Table 3 for a white run.
-var whiteEncodeTable3 = [...]bitString{
- 0: {0x001b, 5}, // "11011"
- 1: {0x0012, 5}, // "10010"
- 2: {0x0017, 6}, // "010111"
- 3: {0x0037, 7}, // "0110111"
- 4: {0x0036, 8}, // "00110110"
- 5: {0x0037, 8}, // "00110111"
- 6: {0x0064, 8}, // "01100100"
- 7: {0x0065, 8}, // "01100101"
- 8: {0x0068, 8}, // "01101000"
- 9: {0x0067, 8}, // "01100111"
- 10: {0x00cc, 9}, // "011001100"
- 11: {0x00cd, 9}, // "011001101"
- 12: {0x00d2, 9}, // "011010010"
- 13: {0x00d3, 9}, // "011010011"
- 14: {0x00d4, 9}, // "011010100"
- 15: {0x00d5, 9}, // "011010101"
- 16: {0x00d6, 9}, // "011010110"
- 17: {0x00d7, 9}, // "011010111"
- 18: {0x00d8, 9}, // "011011000"
- 19: {0x00d9, 9}, // "011011001"
- 20: {0x00da, 9}, // "011011010"
- 21: {0x00db, 9}, // "011011011"
- 22: {0x0098, 9}, // "010011000"
- 23: {0x0099, 9}, // "010011001"
- 24: {0x009a, 9}, // "010011010"
- 25: {0x0018, 6}, // "011000"
- 26: {0x009b, 9}, // "010011011"
- 27: {0x0008, 11}, // "00000001000"
- 28: {0x000c, 11}, // "00000001100"
- 29: {0x000d, 11}, // "00000001101"
- 30: {0x0012, 12}, // "000000010010"
- 31: {0x0013, 12}, // "000000010011"
- 32: {0x0014, 12}, // "000000010100"
- 33: {0x0015, 12}, // "000000010101"
- 34: {0x0016, 12}, // "000000010110"
- 35: {0x0017, 12}, // "000000010111"
- 36: {0x001c, 12}, // "000000011100"
- 37: {0x001d, 12}, // "000000011101"
- 38: {0x001e, 12}, // "000000011110"
- 39: {0x001f, 12}, // "000000011111"
-}
-
-// blackEncodeTable2 represents Table 2 for a black run.
-var blackEncodeTable2 = [...]bitString{
- 0: {0x0037, 10}, // "0000110111"
- 1: {0x0002, 3}, // "010"
- 2: {0x0003, 2}, // "11"
- 3: {0x0002, 2}, // "10"
- 4: {0x0003, 3}, // "011"
- 5: {0x0003, 4}, // "0011"
- 6: {0x0002, 4}, // "0010"
- 7: {0x0003, 5}, // "00011"
- 8: {0x0005, 6}, // "000101"
- 9: {0x0004, 6}, // "000100"
- 10: {0x0004, 7}, // "0000100"
- 11: {0x0005, 7}, // "0000101"
- 12: {0x0007, 7}, // "0000111"
- 13: {0x0004, 8}, // "00000100"
- 14: {0x0007, 8}, // "00000111"
- 15: {0x0018, 9}, // "000011000"
- 16: {0x0017, 10}, // "0000010111"
- 17: {0x0018, 10}, // "0000011000"
- 18: {0x0008, 10}, // "0000001000"
- 19: {0x0067, 11}, // "00001100111"
- 20: {0x0068, 11}, // "00001101000"
- 21: {0x006c, 11}, // "00001101100"
- 22: {0x0037, 11}, // "00000110111"
- 23: {0x0028, 11}, // "00000101000"
- 24: {0x0017, 11}, // "00000010111"
- 25: {0x0018, 11}, // "00000011000"
- 26: {0x00ca, 12}, // "000011001010"
- 27: {0x00cb, 12}, // "000011001011"
- 28: {0x00cc, 12}, // "000011001100"
- 29: {0x00cd, 12}, // "000011001101"
- 30: {0x0068, 12}, // "000001101000"
- 31: {0x0069, 12}, // "000001101001"
- 32: {0x006a, 12}, // "000001101010"
- 33: {0x006b, 12}, // "000001101011"
- 34: {0x00d2, 12}, // "000011010010"
- 35: {0x00d3, 12}, // "000011010011"
- 36: {0x00d4, 12}, // "000011010100"
- 37: {0x00d5, 12}, // "000011010101"
- 38: {0x00d6, 12}, // "000011010110"
- 39: {0x00d7, 12}, // "000011010111"
- 40: {0x006c, 12}, // "000001101100"
- 41: {0x006d, 12}, // "000001101101"
- 42: {0x00da, 12}, // "000011011010"
- 43: {0x00db, 12}, // "000011011011"
- 44: {0x0054, 12}, // "000001010100"
- 45: {0x0055, 12}, // "000001010101"
- 46: {0x0056, 12}, // "000001010110"
- 47: {0x0057, 12}, // "000001010111"
- 48: {0x0064, 12}, // "000001100100"
- 49: {0x0065, 12}, // "000001100101"
- 50: {0x0052, 12}, // "000001010010"
- 51: {0x0053, 12}, // "000001010011"
- 52: {0x0024, 12}, // "000000100100"
- 53: {0x0037, 12}, // "000000110111"
- 54: {0x0038, 12}, // "000000111000"
- 55: {0x0027, 12}, // "000000100111"
- 56: {0x0028, 12}, // "000000101000"
- 57: {0x0058, 12}, // "000001011000"
- 58: {0x0059, 12}, // "000001011001"
- 59: {0x002b, 12}, // "000000101011"
- 60: {0x002c, 12}, // "000000101100"
- 61: {0x005a, 12}, // "000001011010"
- 62: {0x0066, 12}, // "000001100110"
- 63: {0x0067, 12}, // "000001100111"
-}
-
-// blackEncodeTable3 represents Table 3 for a black run.
-var blackEncodeTable3 = [...]bitString{
- 0: {0x000f, 10}, // "0000001111"
- 1: {0x00c8, 12}, // "000011001000"
- 2: {0x00c9, 12}, // "000011001001"
- 3: {0x005b, 12}, // "000001011011"
- 4: {0x0033, 12}, // "000000110011"
- 5: {0x0034, 12}, // "000000110100"
- 6: {0x0035, 12}, // "000000110101"
- 7: {0x006c, 13}, // "0000001101100"
- 8: {0x006d, 13}, // "0000001101101"
- 9: {0x004a, 13}, // "0000001001010"
- 10: {0x004b, 13}, // "0000001001011"
- 11: {0x004c, 13}, // "0000001001100"
- 12: {0x004d, 13}, // "0000001001101"
- 13: {0x0072, 13}, // "0000001110010"
- 14: {0x0073, 13}, // "0000001110011"
- 15: {0x0074, 13}, // "0000001110100"
- 16: {0x0075, 13}, // "0000001110101"
- 17: {0x0076, 13}, // "0000001110110"
- 18: {0x0077, 13}, // "0000001110111"
- 19: {0x0052, 13}, // "0000001010010"
- 20: {0x0053, 13}, // "0000001010011"
- 21: {0x0054, 13}, // "0000001010100"
- 22: {0x0055, 13}, // "0000001010101"
- 23: {0x005a, 13}, // "0000001011010"
- 24: {0x005b, 13}, // "0000001011011"
- 25: {0x0064, 13}, // "0000001100100"
- 26: {0x0065, 13}, // "0000001100101"
- 27: {0x0008, 11}, // "00000001000"
- 28: {0x000c, 11}, // "00000001100"
- 29: {0x000d, 11}, // "00000001101"
- 30: {0x0012, 12}, // "000000010010"
- 31: {0x0013, 12}, // "000000010011"
- 32: {0x0014, 12}, // "000000010100"
- 33: {0x0015, 12}, // "000000010101"
- 34: {0x0016, 12}, // "000000010110"
- 35: {0x0017, 12}, // "000000010111"
- 36: {0x001c, 12}, // "000000011100"
- 37: {0x001d, 12}, // "000000011101"
- 38: {0x001e, 12}, // "000000011110"
- 39: {0x001f, 12}, // "000000011111"
-}
-
-// COPY PASTE table.go BEGIN
-
-const (
- modePass = iota // Pass
- modeH // Horizontal
- modeV0 // Vertical-0
- modeVR1 // Vertical-Right-1
- modeVR2 // Vertical-Right-2
- modeVR3 // Vertical-Right-3
- modeVL1 // Vertical-Left-1
- modeVL2 // Vertical-Left-2
- modeVL3 // Vertical-Left-3
- modeExt // Extension
-)
-
-// COPY PASTE table.go END
diff --git a/vendor/golang.org/x/image/ccitt/writer.go b/vendor/golang.org/x/image/ccitt/writer.go
deleted file mode 100644
index 87130ab0..00000000
--- a/vendor/golang.org/x/image/ccitt/writer.go
+++ /dev/null
@@ -1,102 +0,0 @@
-// Copyright 2019 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 ccitt
-
-import (
- "encoding/binary"
- "io"
-)
-
-type bitWriter struct {
- w io.Writer
-
- // order is whether to process w's bytes LSB first or MSB first.
- order Order
-
- // The high nBits bits of the bits field hold encoded bits to be written to w.
- bits uint64
- nBits uint32
-
- // bytes[:bw] holds encoded bytes not yet written to w.
- // Overflow protection is ensured by using a multiple of 8 as bytes length.
- bw uint32
- bytes [1024]uint8
-}
-
-// flushBits copies 64 bits from b.bits to b.bytes. If b.bytes is then full, it
-// is written to b.w.
-func (b *bitWriter) flushBits() error {
- binary.BigEndian.PutUint64(b.bytes[b.bw:], b.bits)
- b.bits = 0
- b.nBits = 0
- b.bw += 8
- if b.bw < uint32(len(b.bytes)) {
- return nil
- }
- b.bw = 0
- if b.order != MSB {
- reverseBitsWithinBytes(b.bytes[:])
- }
- _, err := b.w.Write(b.bytes[:])
- return err
-}
-
-// close finalizes a bitcode stream by writing any
-// pending bits to bitWriter's underlying io.Writer.
-func (b *bitWriter) close() error {
- // Write any encoded bits to bytes.
- if b.nBits > 0 {
- binary.BigEndian.PutUint64(b.bytes[b.bw:], b.bits)
- b.bw += (b.nBits + 7) >> 3
- }
-
- if b.order != MSB {
- reverseBitsWithinBytes(b.bytes[:b.bw])
- }
-
- // Write b.bw bytes to b.w.
- _, err := b.w.Write(b.bytes[:b.bw])
- return err
-}
-
-// alignToByteBoundary rounds b.nBits up to a multiple of 8.
-// If all 64 bits are used, flush them to bitWriter's bytes.
-func (b *bitWriter) alignToByteBoundary() error {
- if b.nBits = (b.nBits + 7) &^ 7; b.nBits == 64 {
- return b.flushBits()
- }
- return nil
-}
-
-// writeCode writes a variable length bitcode to b's underlying io.Writer.
-func (b *bitWriter) writeCode(bs bitString) error {
- bits := bs.bits
- nBits := bs.nBits
- if 64-b.nBits >= nBits {
- // b.bits has sufficient room for storing nBits bits.
- b.bits |= uint64(bits) << (64 - nBits - b.nBits)
- b.nBits += nBits
- if b.nBits == 64 {
- return b.flushBits()
- }
- return nil
- }
-
- // Number of leading bits that fill b.bits.
- i := 64 - b.nBits
-
- // Fill b.bits then flush and write remaining bits.
- b.bits |= uint64(bits) >> (nBits - i)
- b.nBits = 64
-
- if err := b.flushBits(); err != nil {
- return err
- }
-
- nBits -= i
- b.bits = uint64(bits) << (64 - nBits)
- b.nBits = nBits
- return nil
-}
diff --git a/vendor/golang.org/x/image/tiff/buffer.go b/vendor/golang.org/x/image/tiff/buffer.go
deleted file mode 100644
index d1801be4..00000000
--- a/vendor/golang.org/x/image/tiff/buffer.go
+++ /dev/null
@@ -1,69 +0,0 @@
-// 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
-
-import "io"
-
-// buffer buffers an io.Reader to satisfy io.ReaderAt.
-type buffer struct {
- r io.Reader
- buf []byte
-}
-
-// fill reads data from b.r until the buffer contains at least end bytes.
-func (b *buffer) fill(end int) error {
- m := len(b.buf)
- if end > m {
- if end > cap(b.buf) {
- newcap := 1024
- for newcap < end {
- newcap *= 2
- }
- newbuf := make([]byte, end, newcap)
- copy(newbuf, b.buf)
- b.buf = newbuf
- } else {
- b.buf = b.buf[:end]
- }
- if n, err := io.ReadFull(b.r, b.buf[m:end]); err != nil {
- end = m + n
- b.buf = b.buf[:end]
- return err
- }
- }
- return nil
-}
-
-func (b *buffer) ReadAt(p []byte, off int64) (int, error) {
- o := int(off)
- end := o + len(p)
- if int64(end) != off+int64(len(p)) {
- return 0, io.ErrUnexpectedEOF
- }
-
- err := b.fill(end)
- return copy(p, b.buf[o:end]), err
-}
-
-// Slice returns a slice of the underlying buffer. The slice contains
-// n bytes starting at offset off.
-func (b *buffer) Slice(off, n int) ([]byte, error) {
- end := off + n
- if err := b.fill(end); err != nil {
- return nil, err
- }
- return b.buf[off:end], nil
-}
-
-// newReaderAt converts an io.Reader into an io.ReaderAt.
-func newReaderAt(r io.Reader) io.ReaderAt {
- if ra, ok := r.(io.ReaderAt); ok {
- return ra
- }
- return &buffer{
- r: r,
- buf: make([]byte, 0, 1024),
- }
-}
diff --git a/vendor/golang.org/x/image/tiff/compress.go b/vendor/golang.org/x/image/tiff/compress.go
deleted file mode 100644
index 3f176f00..00000000
--- a/vendor/golang.org/x/image/tiff/compress.go
+++ /dev/null
@@ -1,58 +0,0 @@
-// 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
-
-import (
- "bufio"
- "io"
-)
-
-type byteReader interface {
- io.Reader
- io.ByteReader
-}
-
-// unpackBits decodes the PackBits-compressed data in src and returns the
-// uncompressed data.
-//
-// The PackBits compression format is described in section 9 (p. 42)
-// of the TIFF spec.
-func unpackBits(r io.Reader) ([]byte, error) {
- buf := make([]byte, 128)
- dst := make([]byte, 0, 1024)
- br, ok := r.(byteReader)
- if !ok {
- br = bufio.NewReader(r)
- }
-
- for {
- b, err := br.ReadByte()
- if err != nil {
- if err == io.EOF {
- return dst, nil
- }
- return nil, err
- }
- code := int(int8(b))
- switch {
- case code >= 0:
- n, err := io.ReadFull(br, buf[:code+1])
- if err != nil {
- return nil, err
- }
- dst = append(dst, buf[:n]...)
- case code == -128:
- // No-op.
- default:
- if b, err = br.ReadByte(); err != nil {
- return nil, err
- }
- for j := 0; j < 1-code; j++ {
- buf[j] = b
- }
- dst = append(dst, buf[:1-code]...)
- }
- }
-}
diff --git a/vendor/golang.org/x/image/tiff/consts.go b/vendor/golang.org/x/image/tiff/consts.go
deleted file mode 100644
index 3e5f7f14..00000000
--- a/vendor/golang.org/x/image/tiff/consts.go
+++ /dev/null
@@ -1,149 +0,0 @@
-// 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
-
-// A tiff image file contains one or more images. The metadata
-// of each image is contained in an Image File Directory (IFD),
-// which contains entries of 12 bytes each and is described
-// on page 14-16 of the specification. An IFD entry consists of
-//
-// - a tag, which describes the signification of the entry,
-// - the data type and length of the entry,
-// - the data itself or a pointer to it if it is more than 4 bytes.
-//
-// The presence of a length means that each IFD is effectively an array.
-
-const (
- leHeader = "II\x2A\x00" // Header for little-endian files.
- beHeader = "MM\x00\x2A" // Header for big-endian files.
-
- ifdLen = 12 // Length of an IFD entry in bytes.
-)
-
-// Data types (p. 14-16 of the spec).
-const (
- dtByte = 1
- dtASCII = 2
- dtShort = 3
- dtLong = 4
- dtRational = 5
-)
-
-// The length of one instance of each data type in bytes.
-var lengths = [...]uint32{0, 1, 1, 2, 4, 8}
-
-// Tags (see p. 28-41 of the spec).
-const (
- tImageWidth = 256
- tImageLength = 257
- tBitsPerSample = 258
- tCompression = 259
- tPhotometricInterpretation = 262
-
- tFillOrder = 266
-
- tStripOffsets = 273
- tSamplesPerPixel = 277
- tRowsPerStrip = 278
- tStripByteCounts = 279
-
- tT4Options = 292 // CCITT Group 3 options, a set of 32 flag bits.
- tT6Options = 293 // CCITT Group 4 options, a set of 32 flag bits.
-
- tTileWidth = 322
- tTileLength = 323
- tTileOffsets = 324
- tTileByteCounts = 325
-
- tXResolution = 282
- tYResolution = 283
- tResolutionUnit = 296
-
- tPredictor = 317
- tColorMap = 320
- tExtraSamples = 338
- tSampleFormat = 339
-)
-
-// Compression types (defined in various places in the spec and supplements).
-const (
- cNone = 1
- cCCITT = 2
- cG3 = 3 // Group 3 Fax.
- cG4 = 4 // Group 4 Fax.
- cLZW = 5
- cJPEGOld = 6 // Superseded by cJPEG.
- cJPEG = 7
- cDeflate = 8 // zlib compression.
- cPackBits = 32773
- cDeflateOld = 32946 // Superseded by cDeflate.
-)
-
-// Photometric interpretation values (see p. 37 of the spec).
-const (
- pWhiteIsZero = 0
- pBlackIsZero = 1
- pRGB = 2
- pPaletted = 3
- pTransMask = 4 // transparency mask
- pCMYK = 5
- pYCbCr = 6
- pCIELab = 8
-)
-
-// Values for the tPredictor tag (page 64-65 of the spec).
-const (
- prNone = 1
- prHorizontal = 2
-)
-
-// Values for the tResolutionUnit tag (page 18).
-const (
- resNone = 1
- resPerInch = 2 // Dots per inch.
- resPerCM = 3 // Dots per centimeter.
-)
-
-// imageMode represents the mode of the image.
-type imageMode int
-
-const (
- mBilevel imageMode = iota
- mPaletted
- mGray
- mGrayInvert
- mRGB
- mRGBA
- mNRGBA
- mCMYK
-)
-
-// CompressionType describes the type of compression used in Options.
-type CompressionType int
-
-// Constants for supported compression types.
-const (
- Uncompressed CompressionType = iota
- Deflate
- LZW
- CCITTGroup3
- CCITTGroup4
-)
-
-// specValue returns the compression type constant from the TIFF spec that
-// is equivalent to c.
-func (c CompressionType) specValue() uint32 {
- switch c {
- case LZW:
- return cLZW
- case Deflate:
- return cDeflate
- case CCITTGroup3:
- return cG3
- case CCITTGroup4:
- return cG4
- }
- return cNone
-}
diff --git a/vendor/golang.org/x/image/tiff/fuzz.go b/vendor/golang.org/x/image/tiff/fuzz.go
deleted file mode 100644
index b27c5400..00000000
--- a/vendor/golang.org/x/image/tiff/fuzz.go
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2019 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.
-
-//go:build gofuzz
-// +build gofuzz
-
-package tiff
-
-import "bytes"
-
-func Fuzz(data []byte) int {
- cfg, err := DecodeConfig(bytes.NewReader(data))
- if err != nil {
- return 0
- }
- if cfg.Width*cfg.Height > 1e6 {
- return 0
- }
- img, err := Decode(bytes.NewReader(data))
- if err != nil {
- return 0
- }
- var w bytes.Buffer
- err = Encode(&w, img, nil)
- if err != nil {
- panic(err)
- }
- return 1
-}
diff --git a/vendor/golang.org/x/image/tiff/lzw/reader.go b/vendor/golang.org/x/image/tiff/lzw/reader.go
deleted file mode 100644
index 78204ba9..00000000
--- a/vendor/golang.org/x/image/tiff/lzw/reader.go
+++ /dev/null
@@ -1,272 +0,0 @@
-// 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 lzw implements the Lempel-Ziv-Welch compressed data format,
-// described in T. A. Welch, ``A Technique for High-Performance Data
-// Compression'', Computer, 17(6) (June 1984), pp 8-19.
-//
-// In particular, it implements LZW as used by the TIFF file format, including
-// an "off by one" algorithmic difference when compared to standard LZW.
-package lzw // import "golang.org/x/image/tiff/lzw"
-
-/*
-This file was branched from src/pkg/compress/lzw/reader.go in the
-standard library. Differences from the original are marked with "NOTE".
-
-The tif_lzw.c file in the libtiff C library has this comment:
-
-----
-The 5.0 spec describes a different algorithm than Aldus
-implements. Specifically, Aldus does code length transitions
-one code earlier than should be done (for real LZW).
-Earlier versions of this library implemented the correct
-LZW algorithm, but emitted codes in a bit order opposite
-to the TIFF spec. Thus, to maintain compatibility w/ Aldus
-we interpret MSB-LSB ordered codes to be images written w/
-old versions of this library, but otherwise adhere to the
-Aldus "off by one" algorithm.
-----
-
-The Go code doesn't read (invalid) TIFF files written by old versions of
-libtiff, but the LZW algorithm in this package still differs from the one in
-Go's standard package library to accomodate this "off by one" in valid TIFFs.
-*/
-
-import (
- "bufio"
- "errors"
- "fmt"
- "io"
-)
-
-// Order specifies the bit ordering in an LZW data stream.
-type Order int
-
-const (
- // LSB means Least Significant Bits first, as used in the GIF file format.
- LSB Order = iota
- // MSB means Most Significant Bits first, as used in the TIFF and PDF
- // file formats.
- MSB
-)
-
-const (
- maxWidth = 12
- decoderInvalidCode = 0xffff
- flushBuffer = 1 << maxWidth
-)
-
-// decoder is the state from which the readXxx method converts a byte
-// stream into a code stream.
-type decoder struct {
- r io.ByteReader
- bits uint32
- nBits uint
- width uint
- read func(*decoder) (uint16, error) // readLSB or readMSB
- litWidth int // width in bits of literal codes
- err error
-
- // The first 1<<litWidth codes are literal codes.
- // The next two codes mean clear and EOF.
- // Other valid codes are in the range [lo, hi] where lo := clear + 2,
- // with the upper bound incrementing on each code seen.
- // overflow is the code at which hi overflows the code width. NOTE: TIFF's LZW is "off by one".
- // last is the most recently seen code, or decoderInvalidCode.
- clear, eof, hi, overflow, last uint16
-
- // Each code c in [lo, hi] expands to two or more bytes. For c != hi:
- // suffix[c] is the last of these bytes.
- // prefix[c] is the code for all but the last byte.
- // This code can either be a literal code or another code in [lo, c).
- // The c == hi case is a special case.
- suffix [1 << maxWidth]uint8
- prefix [1 << maxWidth]uint16
-
- // output is the temporary output buffer.
- // Literal codes are accumulated from the start of the buffer.
- // Non-literal codes decode to a sequence of suffixes that are first
- // written right-to-left from the end of the buffer before being copied
- // to the start of the buffer.
- // It is flushed when it contains >= 1<<maxWidth bytes,
- // so that there is always room to decode an entire code.
- output [2 * 1 << maxWidth]byte
- o int // write index into output
- toRead []byte // bytes to return from Read
-}
-
-// readLSB returns the next code for "Least Significant Bits first" data.
-func (d *decoder) readLSB() (uint16, error) {
- for d.nBits < d.width {
- x, err := d.r.ReadByte()
- if err != nil {
- return 0, err
- }
- d.bits |= uint32(x) << d.nBits
- d.nBits += 8
- }
- code := uint16(d.bits & (1<<d.width - 1))
- d.bits >>= d.width
- d.nBits -= d.width
- return code, nil
-}
-
-// readMSB returns the next code for "Most Significant Bits first" data.
-func (d *decoder) readMSB() (uint16, error) {
- for d.nBits < d.width {
- x, err := d.r.ReadByte()
- if err != nil {
- return 0, err
- }
- d.bits |= uint32(x) << (24 - d.nBits)
- d.nBits += 8
- }
- code := uint16(d.bits >> (32 - d.width))
- d.bits <<= d.width
- d.nBits -= d.width
- return code, nil
-}
-
-func (d *decoder) Read(b []byte) (int, error) {
- for {
- if len(d.toRead) > 0 {
- n := copy(b, d.toRead)
- d.toRead = d.toRead[n:]
- return n, nil
- }
- if d.err != nil {
- return 0, d.err
- }
- d.decode()
- }
-}
-
-// decode decompresses bytes from r and leaves them in d.toRead.
-// read specifies how to decode bytes into codes.
-// litWidth is the width in bits of literal codes.
-func (d *decoder) decode() {
- // Loop over the code stream, converting codes into decompressed bytes.
-loop:
- for {
- code, err := d.read(d)
- if err != nil {
- if err == io.EOF {
- err = io.ErrUnexpectedEOF
- }
- d.err = err
- break
- }
- switch {
- case code < d.clear:
- // We have a literal code.
- d.output[d.o] = uint8(code)
- d.o++
- if d.last != decoderInvalidCode {
- // Save what the hi code expands to.
- d.suffix[d.hi] = uint8(code)
- d.prefix[d.hi] = d.last
- }
- case code == d.clear:
- d.width = 1 + uint(d.litWidth)
- d.hi = d.eof
- d.overflow = 1 << d.width
- d.last = decoderInvalidCode
- continue
- case code == d.eof:
- d.err = io.EOF
- break loop
- case code <= d.hi:
- c, i := code, len(d.output)-1
- if code == d.hi && d.last != decoderInvalidCode {
- // code == hi is a special case which expands to the last expansion
- // followed by the head of the last expansion. To find the head, we walk
- // the prefix chain until we find a literal code.
- c = d.last
- for c >= d.clear {
- c = d.prefix[c]
- }
- d.output[i] = uint8(c)
- i--
- c = d.last
- }
- // Copy the suffix chain into output and then write that to w.
- for c >= d.clear {
- d.output[i] = d.suffix[c]
- i--
- c = d.prefix[c]
- }
- d.output[i] = uint8(c)
- d.o += copy(d.output[d.o:], d.output[i:])
- if d.last != decoderInvalidCode {
- // Save what the hi code expands to.
- d.suffix[d.hi] = uint8(c)
- d.prefix[d.hi] = d.last
- }
- default:
- d.err = errors.New("lzw: invalid code")
- break loop
- }
- d.last, d.hi = code, d.hi+1
- if d.hi+1 >= d.overflow { // NOTE: the "+1" is where TIFF's LZW differs from the standard algorithm.
- if d.width == maxWidth {
- d.last = decoderInvalidCode
- } else {
- d.width++
- d.overflow <<= 1
- }
- }
- if d.o >= flushBuffer {
- break
- }
- }
- // Flush pending output.
- d.toRead = d.output[:d.o]
- d.o = 0
-}
-
-var errClosed = errors.New("lzw: reader/writer is closed")
-
-func (d *decoder) Close() error {
- d.err = errClosed // in case any Reads come along
- return nil
-}
-
-// NewReader creates a new io.ReadCloser.
-// Reads from the returned io.ReadCloser read and decompress data from r.
-// If r does not also implement io.ByteReader,
-// the decompressor may read more data than necessary from r.
-// It is the caller's responsibility to call Close on the ReadCloser when
-// finished reading.
-// The number of bits to use for literal codes, litWidth, must be in the
-// range [2,8] and is typically 8. It must equal the litWidth
-// used during compression.
-func NewReader(r io.Reader, order Order, litWidth int) io.ReadCloser {
- d := new(decoder)
- switch order {
- case LSB:
- d.read = (*decoder).readLSB
- case MSB:
- d.read = (*decoder).readMSB
- default:
- d.err = errors.New("lzw: unknown order")
- return d
- }
- if litWidth < 2 || 8 < litWidth {
- d.err = fmt.Errorf("lzw: litWidth %d out of range", litWidth)
- return d
- }
- if br, ok := r.(io.ByteReader); ok {
- d.r = br
- } else {
- d.r = bufio.NewReader(r)
- }
- d.litWidth = litWidth
- d.width = 1 + uint(litWidth)
- d.clear = uint16(1) << uint(litWidth)
- d.eof, d.hi = d.clear+1, d.clear+1
- d.overflow = uint16(1) << d.width
- d.last = decoderInvalidCode
-
- return d
-}
diff --git a/vendor/golang.org/x/image/tiff/reader.go b/vendor/golang.org/x/image/tiff/reader.go
deleted file mode 100644
index de73f4b9..00000000
--- a/vendor/golang.org/x/image/tiff/reader.go
+++ /dev/null
@@ -1,709 +0,0 @@
-// 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)
-}
diff --git a/vendor/golang.org/x/image/tiff/writer.go b/vendor/golang.org/x/image/tiff/writer.go
deleted file mode 100644
index c8a01cea..00000000
--- a/vendor/golang.org/x/image/tiff/writer.go
+++ /dev/null
@@ -1,438 +0,0 @@
-// Copyright 2012 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
-
-import (
- "bytes"
- "compress/zlib"
- "encoding/binary"
- "image"
- "io"
- "sort"
-)
-
-// The TIFF format allows to choose the order of the different elements freely.
-// The basic structure of a TIFF file written by this package is:
-//
-// 1. Header (8 bytes).
-// 2. Image data.
-// 3. Image File Directory (IFD).
-// 4. "Pointer area" for larger entries in the IFD.
-
-// We only write little-endian TIFF files.
-var enc = binary.LittleEndian
-
-// An ifdEntry is a single entry in an Image File Directory.
-// A value of type dtRational is composed of two 32-bit values,
-// thus data contains two uints (numerator and denominator) for a single number.
-type ifdEntry struct {
- tag int
- datatype int
- data []uint32
-}
-
-func (e ifdEntry) putData(p []byte) {
- for _, d := range e.data {
- switch e.datatype {
- case dtByte, dtASCII:
- p[0] = byte(d)
- p = p[1:]
- case dtShort:
- enc.PutUint16(p, uint16(d))
- p = p[2:]
- case dtLong, dtRational:
- enc.PutUint32(p, uint32(d))
- p = p[4:]
- }
- }
-}
-
-type byTag []ifdEntry
-
-func (d byTag) Len() int { return len(d) }
-func (d byTag) Less(i, j int) bool { return d[i].tag < d[j].tag }
-func (d byTag) Swap(i, j int) { d[i], d[j] = d[j], d[i] }
-
-func encodeGray(w io.Writer, pix []uint8, dx, dy, stride int, predictor bool) error {
- if !predictor {
- return writePix(w, pix, dy, dx, stride)
- }
- buf := make([]byte, dx)
- for y := 0; y < dy; y++ {
- min := y*stride + 0
- max := y*stride + dx
- off := 0
- var v0 uint8
- for i := min; i < max; i++ {
- v1 := pix[i]
- buf[off] = v1 - v0
- v0 = v1
- off++
- }
- if _, err := w.Write(buf); err != nil {
- return err
- }
- }
- return nil
-}
-
-func encodeGray16(w io.Writer, pix []uint8, dx, dy, stride int, predictor bool) error {
- buf := make([]byte, dx*2)
- for y := 0; y < dy; y++ {
- min := y*stride + 0
- max := y*stride + dx*2
- off := 0
- var v0 uint16
- for i := min; i < max; i += 2 {
- // An image.Gray16's Pix is in big-endian order.
- v1 := uint16(pix[i])<<8 | uint16(pix[i+1])
- if predictor {
- v0, v1 = v1, v1-v0
- }
- // We only write little-endian TIFF files.
- buf[off+0] = byte(v1)
- buf[off+1] = byte(v1 >> 8)
- off += 2
- }
- if _, err := w.Write(buf); err != nil {
- return err
- }
- }
- return nil
-}
-
-func encodeRGBA(w io.Writer, pix []uint8, dx, dy, stride int, predictor bool) error {
- if !predictor {
- return writePix(w, pix, dy, dx*4, stride)
- }
- buf := make([]byte, dx*4)
- for y := 0; y < dy; y++ {
- min := y*stride + 0
- max := y*stride + dx*4
- off := 0
- var r0, g0, b0, a0 uint8
- for i := min; i < max; i += 4 {
- r1, g1, b1, a1 := pix[i+0], pix[i+1], pix[i+2], pix[i+3]
- buf[off+0] = r1 - r0
- buf[off+1] = g1 - g0
- buf[off+2] = b1 - b0
- buf[off+3] = a1 - a0
- off += 4
- r0, g0, b0, a0 = r1, g1, b1, a1
- }
- if _, err := w.Write(buf); err != nil {
- return err
- }
- }
- return nil
-}
-
-func encodeRGBA64(w io.Writer, pix []uint8, dx, dy, stride int, predictor bool) error {
- buf := make([]byte, dx*8)
- for y := 0; y < dy; y++ {
- min := y*stride + 0
- max := y*stride + dx*8
- off := 0
- var r0, g0, b0, a0 uint16
- for i := min; i < max; i += 8 {
- // An image.RGBA64's Pix is in big-endian order.
- r1 := uint16(pix[i+0])<<8 | uint16(pix[i+1])
- g1 := uint16(pix[i+2])<<8 | uint16(pix[i+3])
- b1 := uint16(pix[i+4])<<8 | uint16(pix[i+5])
- a1 := uint16(pix[i+6])<<8 | uint16(pix[i+7])
- if predictor {
- r0, r1 = r1, r1-r0
- g0, g1 = g1, g1-g0
- b0, b1 = b1, b1-b0
- a0, a1 = a1, a1-a0
- }
- // We only write little-endian TIFF files.
- buf[off+0] = byte(r1)
- buf[off+1] = byte(r1 >> 8)
- buf[off+2] = byte(g1)
- buf[off+3] = byte(g1 >> 8)
- buf[off+4] = byte(b1)
- buf[off+5] = byte(b1 >> 8)
- buf[off+6] = byte(a1)
- buf[off+7] = byte(a1 >> 8)
- off += 8
- }
- if _, err := w.Write(buf); err != nil {
- return err
- }
- }
- return nil
-}
-
-func encode(w io.Writer, m image.Image, predictor bool) error {
- bounds := m.Bounds()
- buf := make([]byte, 4*bounds.Dx())
- for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
- off := 0
- if predictor {
- var r0, g0, b0, a0 uint8
- for x := bounds.Min.X; x < bounds.Max.X; x++ {
- r, g, b, a := m.At(x, y).RGBA()
- r1 := uint8(r >> 8)
- g1 := uint8(g >> 8)
- b1 := uint8(b >> 8)
- a1 := uint8(a >> 8)
- buf[off+0] = r1 - r0
- buf[off+1] = g1 - g0
- buf[off+2] = b1 - b0
- buf[off+3] = a1 - a0
- off += 4
- r0, g0, b0, a0 = r1, g1, b1, a1
- }
- } else {
- for x := bounds.Min.X; x < bounds.Max.X; x++ {
- r, g, b, a := m.At(x, y).RGBA()
- buf[off+0] = uint8(r >> 8)
- buf[off+1] = uint8(g >> 8)
- buf[off+2] = uint8(b >> 8)
- buf[off+3] = uint8(a >> 8)
- off += 4
- }
- }
- if _, err := w.Write(buf); err != nil {
- return err
- }
- }
- return nil
-}
-
-// writePix writes the internal byte array of an image to w. It is less general
-// but much faster then encode. writePix is used when pix directly
-// corresponds to one of the TIFF image types.
-func writePix(w io.Writer, pix []byte, nrows, length, stride int) error {
- if length == stride {
- _, err := w.Write(pix[:nrows*length])
- return err
- }
- for ; nrows > 0; nrows-- {
- if _, err := w.Write(pix[:length]); err != nil {
- return err
- }
- pix = pix[stride:]
- }
- return nil
-}
-
-func writeIFD(w io.Writer, ifdOffset int, d []ifdEntry) error {
- var buf [ifdLen]byte
- // Make space for "pointer area" containing IFD entry data
- // longer than 4 bytes.
- parea := make([]byte, 1024)
- pstart := ifdOffset + ifdLen*len(d) + 6
- var o int // Current offset in parea.
-
- // The IFD has to be written with the tags in ascending order.
- sort.Sort(byTag(d))
-
- // Write the number of entries in this IFD.
- if err := binary.Write(w, enc, uint16(len(d))); err != nil {
- return err
- }
- for _, ent := range d {
- enc.PutUint16(buf[0:2], uint16(ent.tag))
- enc.PutUint16(buf[2:4], uint16(ent.datatype))
- count := uint32(len(ent.data))
- if ent.datatype == dtRational {
- count /= 2
- }
- enc.PutUint32(buf[4:8], count)
- datalen := int(count * lengths[ent.datatype])
- if datalen <= 4 {
- ent.putData(buf[8:12])
- } else {
- if (o + datalen) > len(parea) {
- newlen := len(parea) + 1024
- for (o + datalen) > newlen {
- newlen += 1024
- }
- newarea := make([]byte, newlen)
- copy(newarea, parea)
- parea = newarea
- }
- ent.putData(parea[o : o+datalen])
- enc.PutUint32(buf[8:12], uint32(pstart+o))
- o += datalen
- }
- if _, err := w.Write(buf[:]); err != nil {
- return err
- }
- }
- // The IFD ends with the offset of the next IFD in the file,
- // or zero if it is the last one (page 14).
- if err := binary.Write(w, enc, uint32(0)); err != nil {
- return err
- }
- _, err := w.Write(parea[:o])
- return err
-}
-
-// Options are the encoding parameters.
-type Options struct {
- // Compression is the type of compression used.
- Compression CompressionType
- // Predictor determines whether a differencing predictor is used;
- // if true, instead of each pixel's color, the color difference to the
- // preceding one is saved. This improves the compression for certain
- // types of images and compressors. For example, it works well for
- // photos with Deflate compression.
- Predictor bool
-}
-
-// Encode writes the image m to w. opt determines the options used for
-// encoding, such as the compression type. If opt is nil, an uncompressed
-// image is written.
-func Encode(w io.Writer, m image.Image, opt *Options) error {
- d := m.Bounds().Size()
-
- compression := uint32(cNone)
- predictor := false
- if opt != nil {
- compression = opt.Compression.specValue()
- // The predictor field is only used with LZW. See page 64 of the spec.
- predictor = opt.Predictor && compression == cLZW
- }
-
- _, err := io.WriteString(w, leHeader)
- if err != nil {
- return err
- }
-
- // Compressed data is written into a buffer first, so that we
- // know the compressed size.
- var buf bytes.Buffer
- // dst holds the destination for the pixel data of the image --
- // either w or a writer to buf.
- var dst io.Writer
- // imageLen is the length of the pixel data in bytes.
- // The offset of the IFD is imageLen + 8 header bytes.
- var imageLen int
-
- switch compression {
- case cNone:
- dst = w
- // Write IFD offset before outputting pixel data.
- switch m.(type) {
- case *image.Paletted:
- imageLen = d.X * d.Y * 1
- case *image.Gray:
- imageLen = d.X * d.Y * 1
- case *image.Gray16:
- imageLen = d.X * d.Y * 2
- case *image.RGBA64:
- imageLen = d.X * d.Y * 8
- case *image.NRGBA64:
- imageLen = d.X * d.Y * 8
- default:
- imageLen = d.X * d.Y * 4
- }
- err = binary.Write(w, enc, uint32(imageLen+8))
- if err != nil {
- return err
- }
- case cDeflate:
- dst = zlib.NewWriter(&buf)
- }
-
- pr := uint32(prNone)
- photometricInterpretation := uint32(pRGB)
- samplesPerPixel := uint32(4)
- bitsPerSample := []uint32{8, 8, 8, 8}
- extraSamples := uint32(0)
- colorMap := []uint32{}
-
- if predictor {
- pr = prHorizontal
- }
- switch m := m.(type) {
- case *image.Paletted:
- photometricInterpretation = pPaletted
- samplesPerPixel = 1
- bitsPerSample = []uint32{8}
- colorMap = make([]uint32, 256*3)
- for i := 0; i < 256 && i < len(m.Palette); i++ {
- r, g, b, _ := m.Palette[i].RGBA()
- colorMap[i+0*256] = uint32(r)
- colorMap[i+1*256] = uint32(g)
- colorMap[i+2*256] = uint32(b)
- }
- err = encodeGray(dst, m.Pix, d.X, d.Y, m.Stride, predictor)
- case *image.Gray:
- photometricInterpretation = pBlackIsZero
- samplesPerPixel = 1
- bitsPerSample = []uint32{8}
- err = encodeGray(dst, m.Pix, d.X, d.Y, m.Stride, predictor)
- case *image.Gray16:
- photometricInterpretation = pBlackIsZero
- samplesPerPixel = 1
- bitsPerSample = []uint32{16}
- err = encodeGray16(dst, m.Pix, d.X, d.Y, m.Stride, predictor)
- case *image.NRGBA:
- extraSamples = 2 // Unassociated alpha.
- err = encodeRGBA(dst, m.Pix, d.X, d.Y, m.Stride, predictor)
- case *image.NRGBA64:
- extraSamples = 2 // Unassociated alpha.
- bitsPerSample = []uint32{16, 16, 16, 16}
- err = encodeRGBA64(dst, m.Pix, d.X, d.Y, m.Stride, predictor)
- case *image.RGBA:
- extraSamples = 1 // Associated alpha.
- err = encodeRGBA(dst, m.Pix, d.X, d.Y, m.Stride, predictor)
- case *image.RGBA64:
- extraSamples = 1 // Associated alpha.
- bitsPerSample = []uint32{16, 16, 16, 16}
- err = encodeRGBA64(dst, m.Pix, d.X, d.Y, m.Stride, predictor)
- default:
- extraSamples = 1 // Associated alpha.
- err = encode(dst, m, predictor)
- }
- if err != nil {
- return err
- }
-
- if compression != cNone {
- if err = dst.(io.Closer).Close(); err != nil {
- return err
- }
- imageLen = buf.Len()
- if err = binary.Write(w, enc, uint32(imageLen+8)); err != nil {
- return err
- }
- if _, err = buf.WriteTo(w); err != nil {
- return err
- }
- }
-
- ifd := []ifdEntry{
- {tImageWidth, dtShort, []uint32{uint32(d.X)}},
- {tImageLength, dtShort, []uint32{uint32(d.Y)}},
- {tBitsPerSample, dtShort, bitsPerSample},
- {tCompression, dtShort, []uint32{compression}},
- {tPhotometricInterpretation, dtShort, []uint32{photometricInterpretation}},
- {tStripOffsets, dtLong, []uint32{8}},
- {tSamplesPerPixel, dtShort, []uint32{samplesPerPixel}},
- {tRowsPerStrip, dtShort, []uint32{uint32(d.Y)}},
- {tStripByteCounts, dtLong, []uint32{uint32(imageLen)}},
- // There is currently no support for storing the image
- // resolution, so give a bogus value of 72x72 dpi.
- {tXResolution, dtRational, []uint32{72, 1}},
- {tYResolution, dtRational, []uint32{72, 1}},
- {tResolutionUnit, dtShort, []uint32{resPerInch}},
- }
- if pr != prNone {
- ifd = append(ifd, ifdEntry{tPredictor, dtShort, []uint32{pr}})
- }
- if len(colorMap) != 0 {
- ifd = append(ifd, ifdEntry{tColorMap, dtShort, colorMap})
- }
- if extraSamples > 0 {
- ifd = append(ifd, ifdEntry{tExtraSamples, dtShort, []uint32{extraSamples}})
- }
-
- return writeIFD(w, imageLen+8, ifd)
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 09:21:43 +0000