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