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.
88 lines
2 KiB
Go
88 lines
2 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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// byteReader provides a byte reader that reads
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// little endian values from a byte stream.
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// The input stream is manually advanced.
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// The reader performs no bounds checks.
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type byteReader struct {
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b []byte
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off int
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}
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// init will initialize the reader and set the input.
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func (b *byteReader) init(in []byte) {
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b.b = in
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b.off = 0
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}
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// advance the stream b n bytes.
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func (b *byteReader) advance(n uint) {
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b.off += int(n)
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}
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// overread returns whether we have advanced too far.
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func (b *byteReader) overread() bool {
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return b.off > len(b.b)
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}
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// Int32 returns a little endian int32 starting at current offset.
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func (b byteReader) Int32() int32 {
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b2 := b.b[b.off:]
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b2 = b2[:4]
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v3 := int32(b2[3])
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v2 := int32(b2[2])
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v1 := int32(b2[1])
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v0 := int32(b2[0])
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return v0 | (v1 << 8) | (v2 << 16) | (v3 << 24)
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}
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// Uint8 returns the next byte
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func (b *byteReader) Uint8() uint8 {
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v := b.b[b.off]
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return v
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}
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// Uint32 returns a little endian uint32 starting at current offset.
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func (b byteReader) Uint32() uint32 {
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if r := b.remain(); r < 4 {
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// Very rare
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v := uint32(0)
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for i := 1; i <= r; i++ {
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v = (v << 8) | uint32(b.b[len(b.b)-i])
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}
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return v
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}
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b2 := b.b[b.off:]
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b2 = b2[:4]
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v3 := uint32(b2[3])
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v2 := uint32(b2[2])
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v1 := uint32(b2[1])
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v0 := uint32(b2[0])
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return v0 | (v1 << 8) | (v2 << 16) | (v3 << 24)
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}
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// Uint32NC returns a little endian uint32 starting at current offset.
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// The caller must be sure if there are at least 4 bytes left.
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func (b byteReader) Uint32NC() uint32 {
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b2 := b.b[b.off:]
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b2 = b2[:4]
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v3 := uint32(b2[3])
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v2 := uint32(b2[2])
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v1 := uint32(b2[1])
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v0 := uint32(b2[0])
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return v0 | (v1 << 8) | (v2 << 16) | (v3 << 24)
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}
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// unread returns the unread portion of the input.
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func (b byteReader) unread() []byte {
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return b.b[b.off:]
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}
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// remain will return the number of bytes remaining.
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func (b byteReader) remain() int {
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return len(b.b) - b.off
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}
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