986f076276
Add a new generic container registry client via a new `container` package. Use this to create a command line utility as well as a new upload target for container registries. The code uses the github.com/containers/* project and packages to interact with container registires that is also used by skopeo, podman et al. One if the dependencies is `proglottis/gpgme` that is using cgo to bind libgpgme, so we have to add the corresponding devel package to the BuildRequires as well as installing it on CI. Checks will follow later via an integration test.
125 lines
2.7 KiB
Go
125 lines
2.7 KiB
Go
// Copyright 2014-2021 Ulrich Kunitz. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package lzma
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// literalCodec supports the encoding of literal. It provides 768 probability
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// values per literal state. The upper 512 probabilities are used with the
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// context of a match bit.
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type literalCodec struct {
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probs []prob
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}
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// deepcopy initializes literal codec c as a deep copy of the source.
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func (c *literalCodec) deepcopy(src *literalCodec) {
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if c == src {
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return
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}
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c.probs = make([]prob, len(src.probs))
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copy(c.probs, src.probs)
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}
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// init initializes the literal codec.
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func (c *literalCodec) init(lc, lp int) {
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switch {
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case !(minLC <= lc && lc <= maxLC):
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panic("lc out of range")
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case !(minLP <= lp && lp <= maxLP):
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panic("lp out of range")
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}
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c.probs = make([]prob, 0x300<<uint(lc+lp))
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for i := range c.probs {
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c.probs[i] = probInit
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}
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}
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// Encode encodes the byte s using a range encoder as well as the current LZMA
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// encoder state, a match byte and the literal state.
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func (c *literalCodec) Encode(e *rangeEncoder, s byte,
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state uint32, match byte, litState uint32,
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) (err error) {
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k := litState * 0x300
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probs := c.probs[k : k+0x300]
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symbol := uint32(1)
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r := uint32(s)
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if state >= 7 {
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m := uint32(match)
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for {
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matchBit := (m >> 7) & 1
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m <<= 1
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bit := (r >> 7) & 1
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r <<= 1
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i := ((1 + matchBit) << 8) | symbol
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if err = probs[i].Encode(e, bit); err != nil {
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return
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}
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symbol = (symbol << 1) | bit
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if matchBit != bit {
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break
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}
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if symbol >= 0x100 {
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break
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}
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}
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}
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for symbol < 0x100 {
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bit := (r >> 7) & 1
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r <<= 1
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if err = probs[symbol].Encode(e, bit); err != nil {
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return
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}
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symbol = (symbol << 1) | bit
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}
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return nil
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}
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// Decode decodes a literal byte using the range decoder as well as the LZMA
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// state, a match byte, and the literal state.
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func (c *literalCodec) Decode(d *rangeDecoder,
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state uint32, match byte, litState uint32,
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) (s byte, err error) {
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k := litState * 0x300
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probs := c.probs[k : k+0x300]
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symbol := uint32(1)
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if state >= 7 {
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m := uint32(match)
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for {
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matchBit := (m >> 7) & 1
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m <<= 1
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i := ((1 + matchBit) << 8) | symbol
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bit, err := d.DecodeBit(&probs[i])
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if err != nil {
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return 0, err
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}
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symbol = (symbol << 1) | bit
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if matchBit != bit {
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break
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}
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if symbol >= 0x100 {
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break
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}
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}
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}
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for symbol < 0x100 {
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bit, err := d.DecodeBit(&probs[symbol])
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if err != nil {
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return 0, err
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}
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symbol = (symbol << 1) | bit
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}
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s = byte(symbol - 0x100)
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return s, nil
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}
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// minLC and maxLC define the range for LC values.
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const (
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minLC = 0
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maxLC = 8
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)
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// minLC and maxLC define the range for LP values.
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const (
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minLP = 0
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maxLP = 4
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)
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