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// Copyright 2023 Sylabs Inc. All rights reserved.
//
// SPDX-License-Identifier: Apache-2.0
package sif
import (
"io"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/partial"
"github.com/google/go-containerregistry/pkg/v1/types"
)
var _ v1.Layer = (*Layer)(nil)
type Layer struct {
f *fileImage
desc v1.Descriptor
}
// Digest returns the Hash of the compressed layer.
func (l *Layer) Digest() (v1.Hash, error) {
return l.desc.Digest, nil
}
// DiffID returns the Hash of the uncompressed layer.
func (l *Layer) DiffID() (v1.Hash, error) {
r, err := l.Uncompressed()
if err != nil {
return v1.Hash{}, err
}
defer r.Close()
h, _, err := v1.SHA256(r)
return h, err
}
// Compressed returns an io.ReadCloser for the compressed layer contents.
func (l *Layer) Compressed() (io.ReadCloser, error) {
return l.f.Blob(l.desc.Digest)
}
// Uncompressed returns an io.ReadCloser for the uncompressed layer contents.
func (l *Layer) Uncompressed() (io.ReadCloser, error) {
cl, err := partial.CompressedToLayer(l)
if err != nil {
return nil, err
}
return cl.Uncompressed()
}
// Size returns the compressed size of the Layer.
func (l *Layer) Size() (int64, error) {
return l.desc.Size, nil
}
// Offset returns the offset within the SIF image of the Layer.
func (l *Layer) Offset() (int64, error) {
return l.f.Offset(l.desc.Digest)
}
// MediaType returns the media type of the Layer.
func (l *Layer) MediaType() (types.MediaType, error) {
return l.desc.MediaType, nil
}
// Descriptor returns the original descriptor from an image manifest. See partial.Descriptor.
func (l *Layer) Descriptor() (*v1.Descriptor, error) {
return &l.desc, nil
}
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