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60 lines
1.7 KiB
Go
60 lines
1.7 KiB
Go
package pack
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import (
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"bytes"
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"encoding/binary"
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"io"
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"testing"
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"github.com/restic/restic/internal/crypto"
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rtest "github.com/restic/restic/internal/test"
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)
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type countingReaderAt struct {
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delegate io.ReaderAt
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invocationCount int
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}
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func (rd *countingReaderAt) ReadAt(p []byte, off int64) (n int, err error) {
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rd.invocationCount++
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return rd.delegate.ReadAt(p, off)
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}
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func TestReadHeaderEagerLoad(t *testing.T) {
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testReadHeader := func(dataSize int, entryCount uint, expectedReadInvocationCount int) {
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expectedHeader := rtest.Random(0, int(entryCount*entrySize)+crypto.Extension)
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buf := &bytes.Buffer{}
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buf.Write(rtest.Random(0, dataSize)) // pack blobs data
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buf.Write(expectedHeader) // pack header
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binary.Write(buf, binary.LittleEndian, uint32(len(expectedHeader))) // pack header length
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rd := &countingReaderAt{delegate: bytes.NewReader(buf.Bytes())}
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header, err := readHeader(rd, int64(buf.Len()))
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rtest.OK(t, err)
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rtest.Equals(t, expectedHeader, header)
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rtest.Equals(t, expectedReadInvocationCount, rd.invocationCount)
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}
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// basic
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testReadHeader(100, 1, 1)
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// header entries == eager entries
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testReadHeader(100, eagerEntries-1, 1)
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testReadHeader(100, eagerEntries, 1)
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testReadHeader(100, eagerEntries+1, 2)
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// file size == eager header load size
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eagerLoadSize := int((eagerEntries * entrySize) + crypto.Extension)
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headerSize := int(1*entrySize) + crypto.Extension
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dataSize := eagerLoadSize - headerSize - binary.Size(uint32(0))
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testReadHeader(dataSize-1, 1, 1)
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testReadHeader(dataSize, 1, 1)
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testReadHeader(dataSize+1, 1, 1)
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testReadHeader(dataSize+2, 1, 1)
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testReadHeader(dataSize+3, 1, 1)
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testReadHeader(dataSize+4, 1, 1)
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}
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