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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/sylabs/sif/v2/pkg/sif"
)
// fileImage represents a Singularity Image Format (SIF) file containing OCI artifacts.
type fileImage struct {
*sif.FileImage
}
// Blob returns a ReadCloser that reads the blob with the supplied digest.
func (f *fileImage) Blob(h v1.Hash) (io.ReadCloser, error) {
d, err := f.GetDescriptor(sif.WithOCIBlobDigest(h))
if err != nil {
return nil, err
}
return io.NopCloser(d.GetReader()), nil
}
// Bytes returns the bytes of the blob with the supplied digest.
func (f *fileImage) Bytes(h v1.Hash) ([]byte, error) {
d, err := f.GetDescriptor(sif.WithOCIBlobDigest(h))
if err != nil {
return nil, err
}
return d.GetData()
}
// Offset returns the offset within the SIF image of the blob with the supplied digest.
func (f *fileImage) Offset(h v1.Hash) (int64, error) {
d, err := f.GetDescriptor(sif.WithOCIBlobDigest(h))
if err != nil {
return 0, err
}
return d.Offset(), nil
}
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