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package compression
import (
"context"
"io"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/images"
"github.com/moby/buildkit/util/iohelper"
ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
)
func (c uncompressedType) Compress(ctx context.Context, comp Config) (compressorFunc Compressor, finalize Finalizer) {
return func(dest io.Writer, mediaType string) (io.WriteCloser, error) {
return &iohelper.NopWriteCloser{Writer: dest}, nil
}, nil
}
func (c uncompressedType) Decompress(ctx context.Context, cs content.Store, desc ocispecs.Descriptor) (io.ReadCloser, error) {
ra, err := cs.ReaderAt(ctx, desc)
if err != nil {
return nil, err
}
return iohelper.ReadCloser(ra), nil
}
func (c uncompressedType) NeedsConversion(ctx context.Context, cs content.Store, desc ocispecs.Descriptor) (bool, error) {
if !images.IsLayerType(desc.MediaType) {
return false, nil
}
ct, err := FromMediaType(desc.MediaType)
if err != nil {
return false, err
}
if ct == Uncompressed {
return false, nil
}
return true, nil
}
func (c uncompressedType) NeedsComputeDiffBySelf(comp Config) bool {
return false
}
func (c uncompressedType) OnlySupportOCITypes() bool {
return false
}
func (c uncompressedType) MediaType() string {
return ocispecs.MediaTypeImageLayer
}
func (c uncompressedType) String() string {
return "uncompressed"
}
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