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//go:build linux
package minimal
import (
"bytes"
"encoding/binary"
"errors"
"testing"
"github.com/stretchr/testify/assert"
)
func TestGenerateAndReadFooter(t *testing.T) {
footer := ZstdChunkedFooterData{
ManifestType: 1,
Offset: 2,
LengthCompressed: 3,
LengthUncompressed: 4,
OffsetTarSplit: 5,
LengthCompressedTarSplit: 6,
LengthUncompressedTarSplit: 7,
ChecksumAnnotationTarSplit: "", // unused
}
b := footerDataToBlob(footer)
assert.Len(t, b, FooterSizeSupported)
footer2, err := readFooterDataFromBlob(b)
if err != nil {
t.Fatal(err)
}
assert.Equal(t, footer, footer2)
}
// readFooterDataFromBlob reads the zstd:chunked footer from the binary buffer.
func readFooterDataFromBlob(footer []byte) (ZstdChunkedFooterData, error) {
var footerData ZstdChunkedFooterData
if len(footer) < FooterSizeSupported {
return footerData, errors.New("blob too small")
}
footerData.Offset = binary.LittleEndian.Uint64(footer[0:8])
footerData.LengthCompressed = binary.LittleEndian.Uint64(footer[8:16])
footerData.LengthUncompressed = binary.LittleEndian.Uint64(footer[16:24])
footerData.ManifestType = binary.LittleEndian.Uint64(footer[24:32])
footerData.OffsetTarSplit = binary.LittleEndian.Uint64(footer[32:40])
footerData.LengthCompressedTarSplit = binary.LittleEndian.Uint64(footer[40:48])
footerData.LengthUncompressedTarSplit = binary.LittleEndian.Uint64(footer[48:56])
// the magic number is stored in the last 8 bytes
if !bytes.Equal(ZstdChunkedFrameMagic, footer[len(footer)-len(ZstdChunkedFrameMagic):]) {
return footerData, errors.New("invalid magic number")
}
return footerData, nil
}
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