81 lines
2.3 KiB
Go
81 lines
2.3 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package testutil
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import (
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"bytes"
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"io"
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"github.com/containerd/stargz-snapshotter/estargz"
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esgzexternaltoc "github.com/containerd/stargz-snapshotter/estargz/externaltoc"
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"github.com/containerd/stargz-snapshotter/estargz/zstdchunked"
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"github.com/klauspost/compress/zstd"
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)
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type Compression interface {
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estargz.Compressor
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estargz.Decompressor
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// DecompressTOC decompresses the passed blob and returns a reader of TOC JSON.
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// This is needed to be used from metadata pkg
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DecompressTOC(io.Reader) (tocJSON io.ReadCloser, err error)
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}
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type CompressionFactory func() Compression
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type zstdCompression struct {
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*zstdchunked.Compressor
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*zstdchunked.Decompressor
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}
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func ZstdCompressionWithLevel(compressionLevel zstd.EncoderLevel) CompressionFactory {
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return func() Compression {
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return &zstdCompression{&zstdchunked.Compressor{CompressionLevel: compressionLevel}, &zstdchunked.Decompressor{}}
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}
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}
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type gzipCompression struct {
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*estargz.GzipCompressor
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*estargz.GzipDecompressor
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}
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func GzipCompressionWithLevel(compressionLevel int) CompressionFactory {
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return func() Compression {
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return gzipCompression{estargz.NewGzipCompressorWithLevel(compressionLevel), &estargz.GzipDecompressor{}}
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}
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}
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type externalTOCGzipCompression struct {
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*esgzexternaltoc.GzipCompressor
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*esgzexternaltoc.GzipDecompressor
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}
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func ExternalTOCGzipCompressionWithLevel(compressionLevel int) CompressionFactory {
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return func() Compression {
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compressor := esgzexternaltoc.NewGzipCompressorWithLevel(compressionLevel)
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decompressor := esgzexternaltoc.NewGzipDecompressor(func() ([]byte, error) {
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buf := new(bytes.Buffer)
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if _, err := compressor.WriteTOCTo(buf); err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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})
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return &externalTOCGzipCompression{compressor, decompressor}
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}
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}
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