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.
133 lines
3.5 KiB
Go
133 lines
3.5 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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// treeCodec encodes or decodes values with a fixed bit size. It is using a
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// tree of probability value. The root of the tree is the most-significant bit.
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type treeCodec struct {
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probTree
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}
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// makeTreeCodec makes a tree codec. The bits value must be inside the range
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// [1,32].
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func makeTreeCodec(bits int) treeCodec {
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return treeCodec{makeProbTree(bits)}
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}
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// deepcopy initializes tc as a deep copy of the source.
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func (tc *treeCodec) deepcopy(src *treeCodec) {
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tc.probTree.deepcopy(&src.probTree)
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}
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// Encode uses the range encoder to encode a fixed-bit-size value.
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func (tc *treeCodec) Encode(e *rangeEncoder, v uint32) (err error) {
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m := uint32(1)
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for i := int(tc.bits) - 1; i >= 0; i-- {
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b := (v >> uint(i)) & 1
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if err := e.EncodeBit(b, &tc.probs[m]); err != nil {
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return err
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}
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m = (m << 1) | b
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}
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return nil
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}
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// Decodes uses the range decoder to decode a fixed-bit-size value. Errors may
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// be caused by the range decoder.
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func (tc *treeCodec) Decode(d *rangeDecoder) (v uint32, err error) {
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m := uint32(1)
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for j := 0; j < int(tc.bits); j++ {
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b, err := d.DecodeBit(&tc.probs[m])
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if err != nil {
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return 0, err
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}
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m = (m << 1) | b
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}
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return m - (1 << uint(tc.bits)), nil
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}
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// treeReverseCodec is another tree codec, where the least-significant bit is
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// the start of the probability tree.
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type treeReverseCodec struct {
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probTree
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}
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// deepcopy initializes the treeReverseCodec as a deep copy of the
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// source.
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func (tc *treeReverseCodec) deepcopy(src *treeReverseCodec) {
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tc.probTree.deepcopy(&src.probTree)
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}
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// makeTreeReverseCodec creates treeReverseCodec value. The bits argument must
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// be in the range [1,32].
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func makeTreeReverseCodec(bits int) treeReverseCodec {
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return treeReverseCodec{makeProbTree(bits)}
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}
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// Encode uses range encoder to encode a fixed-bit-size value. The range
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// encoder may cause errors.
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func (tc *treeReverseCodec) Encode(v uint32, e *rangeEncoder) (err error) {
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m := uint32(1)
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for i := uint(0); i < uint(tc.bits); i++ {
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b := (v >> i) & 1
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if err := e.EncodeBit(b, &tc.probs[m]); err != nil {
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return err
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}
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m = (m << 1) | b
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}
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return nil
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}
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// Decodes uses the range decoder to decode a fixed-bit-size value. Errors
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// returned by the range decoder will be returned.
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func (tc *treeReverseCodec) Decode(d *rangeDecoder) (v uint32, err error) {
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m := uint32(1)
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for j := uint(0); j < uint(tc.bits); j++ {
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b, err := d.DecodeBit(&tc.probs[m])
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if err != nil {
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return 0, err
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}
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m = (m << 1) | b
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v |= b << j
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}
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return v, nil
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}
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// probTree stores enough probability values to be used by the treeEncode and
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// treeDecode methods of the range coder types.
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type probTree struct {
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probs []prob
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bits byte
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}
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// deepcopy initializes the probTree value as a deep copy of the source.
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func (t *probTree) deepcopy(src *probTree) {
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if t == src {
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return
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}
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t.probs = make([]prob, len(src.probs))
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copy(t.probs, src.probs)
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t.bits = src.bits
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}
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// makeProbTree initializes a probTree structure.
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func makeProbTree(bits int) probTree {
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if !(1 <= bits && bits <= 32) {
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panic("bits outside of range [1,32]")
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}
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t := probTree{
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bits: byte(bits),
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probs: make([]prob, 1<<uint(bits)),
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}
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for i := range t.probs {
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t.probs[i] = probInit
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}
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return t
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}
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// Bits provides the number of bits for the values to de- or encode.
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func (t *probTree) Bits() int {
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return int(t.bits)
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}
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