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
2.5 KiB
Go
133 lines
2.5 KiB
Go
// Copyright 2019+ Klaus Post. All rights reserved.
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// License information can be found in the LICENSE file.
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// Based on work by Yann Collet, released under BSD License.
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package zstd
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import (
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"fmt"
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"io"
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"io/ioutil"
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)
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type byteBuffer interface {
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// Read up to 8 bytes.
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// Returns io.ErrUnexpectedEOF if this cannot be satisfied.
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readSmall(n int) ([]byte, error)
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// Read >8 bytes.
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// MAY use the destination slice.
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readBig(n int, dst []byte) ([]byte, error)
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// Read a single byte.
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readByte() (byte, error)
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// Skip n bytes.
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skipN(n int) error
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}
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// in-memory buffer
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type byteBuf []byte
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func (b *byteBuf) readSmall(n int) ([]byte, error) {
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if debugAsserts && n > 8 {
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panic(fmt.Errorf("small read > 8 (%d). use readBig", n))
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}
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bb := *b
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if len(bb) < n {
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return nil, io.ErrUnexpectedEOF
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}
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r := bb[:n]
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*b = bb[n:]
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return r, nil
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}
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func (b *byteBuf) readBig(n int, dst []byte) ([]byte, error) {
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bb := *b
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if len(bb) < n {
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return nil, io.ErrUnexpectedEOF
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}
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r := bb[:n]
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*b = bb[n:]
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return r, nil
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}
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func (b *byteBuf) remain() []byte {
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return *b
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}
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func (b *byteBuf) readByte() (byte, error) {
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bb := *b
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if len(bb) < 1 {
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return 0, nil
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}
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r := bb[0]
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*b = bb[1:]
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return r, nil
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}
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func (b *byteBuf) skipN(n int) error {
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bb := *b
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if len(bb) < n {
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return io.ErrUnexpectedEOF
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}
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*b = bb[n:]
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return nil
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}
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// wrapper around a reader.
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type readerWrapper struct {
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r io.Reader
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tmp [8]byte
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}
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func (r *readerWrapper) readSmall(n int) ([]byte, error) {
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if debugAsserts && n > 8 {
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panic(fmt.Errorf("small read > 8 (%d). use readBig", n))
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}
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n2, err := io.ReadFull(r.r, r.tmp[:n])
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// We only really care about the actual bytes read.
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if err != nil {
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if err == io.EOF {
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return nil, io.ErrUnexpectedEOF
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}
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if debugDecoder {
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println("readSmall: got", n2, "want", n, "err", err)
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}
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return nil, err
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}
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return r.tmp[:n], nil
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}
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func (r *readerWrapper) readBig(n int, dst []byte) ([]byte, error) {
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if cap(dst) < n {
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dst = make([]byte, n)
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}
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n2, err := io.ReadFull(r.r, dst[:n])
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if err == io.EOF && n > 0 {
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err = io.ErrUnexpectedEOF
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}
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return dst[:n2], err
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}
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func (r *readerWrapper) readByte() (byte, error) {
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n2, err := r.r.Read(r.tmp[:1])
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if err != nil {
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if err == io.EOF {
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err = io.ErrUnexpectedEOF
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}
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return 0, err
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}
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if n2 != 1 {
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return 0, io.ErrUnexpectedEOF
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}
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return r.tmp[0], nil
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}
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func (r *readerWrapper) skipN(n int) error {
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n2, err := io.CopyN(ioutil.Discard, r.r, int64(n))
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if n2 != int64(n) {
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err = io.ErrUnexpectedEOF
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}
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return err
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}
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