Update dependencies (#1610)

* Update dependencies

* Update module to go 1.17

3 files changed, 0 insertions, 1869 deletions

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
-}