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