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signature_test.go
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signature_test.go
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package rdiff
import (
"bytes"
"encoding/binary"
"testing"
cryptoRand "crypto/rand"
"github.com/stretchr/testify/assert"
)
type TestSignatureData struct {
blockSize uint32
fileContent []byte
checksumType ChecksumType
strongChecksumSize uint32
weakChecksums []uint32
strongChecksums [][]byte
}
func generateTestData() (data []TestSignatureData, err error) {
for _, blockSize := range BlockSizes {
for _, checksumType := range ChecksumTypes {
for _, strongChecksumSize := range StrongChecksumSizes {
checksum, err := NewChecksum(checksumType)
if err != nil {
return nil, err
}
if maxStrongChecksumSize := checksum.MaxStrongChecksumSize(); strongChecksumSize > maxStrongChecksumSize {
continue
}
signatureData := TestSignatureData{
blockSize: blockSize,
checksumType: checksumType,
strongChecksumSize: strongChecksumSize,
}
blockNumber := rand(1, 256)
for i := 0; i < blockNumber; i++ {
size := blockSize
if i == blockNumber-1 {
size = rand32(1, int(blockSize))
}
block := make([]byte, size)
if _, err := cryptoRand.Read(block); err != nil {
return nil, err
}
signatureData.fileContent = append(signatureData.fileContent, block...)
weakChecksum := checksum.CalculateWeakChecksum(block)
signatureData.weakChecksums = append(signatureData.weakChecksums, weakChecksum)
strongChecksum, _ := checksum.CalculateStrongChecksum(block, signatureData.strongChecksumSize)
signatureData.strongChecksums = append(signatureData.strongChecksums, strongChecksum)
}
data = append(data, signatureData)
}
}
}
return data, nil
}
func TestWriteSignature(t *testing.T) {
testData, err := generateTestData()
assert.Nil(t, err)
for _, signatureData := range testData {
expectedBuffer := &bytes.Buffer{}
err = binary.Write(expectedBuffer, binary.BigEndian, signatureData.checksumType)
assert.Nil(t, err)
err = binary.Write(expectedBuffer, binary.BigEndian, signatureData.blockSize)
assert.Nil(t, err)
err = binary.Write(expectedBuffer, binary.BigEndian, signatureData.strongChecksumSize)
assert.Nil(t, err)
for i := 0; i < len(signatureData.weakChecksums); i++ {
err = binary.Write(expectedBuffer, binary.BigEndian, signatureData.weakChecksums[i])
assert.Nil(t, err)
n, err := expectedBuffer.Write(signatureData.strongChecksums[i])
assert.Nil(t, err)
assert.Equal(t, len(signatureData.strongChecksums[i]), n)
}
inputBuffer := bytes.NewReader(signatureData.fileContent)
outputBuffer := &bytes.Buffer{}
outputBuffer.Grow(expectedBuffer.Len())
err = WriteSignature(inputBuffer, outputBuffer, signatureData.checksumType, signatureData.blockSize, signatureData.strongChecksumSize)
assert.Nil(t, err)
assert.Equal(t, expectedBuffer, outputBuffer)
}
}
func TestReadSignature(t *testing.T) {
testData, err := generateTestData()
assert.Nil(t, err)
for _, signatureData := range testData {
inputBuffer := &bytes.Buffer{}
expectedSignature := &Signature{}
expectedSignature.checksumType = signatureData.checksumType
err = binary.Write(inputBuffer, binary.BigEndian, signatureData.checksumType)
assert.Nil(t, err)
expectedSignature.blockSize = signatureData.blockSize
err = binary.Write(inputBuffer, binary.BigEndian, signatureData.blockSize)
assert.Nil(t, err)
expectedSignature.strongChecksumSize = signatureData.strongChecksumSize
err = binary.Write(inputBuffer, binary.BigEndian, signatureData.strongChecksumSize)
assert.Nil(t, err)
expectedSignature.weakChecksums = make(map[uint32]int)
expectedSignature.strongChecksums = append(expectedSignature.strongChecksums, signatureData.strongChecksums...)
for i := 0; i < len(signatureData.weakChecksums); i++ {
weakChecksum := signatureData.weakChecksums[i]
expectedSignature.weakChecksums[weakChecksum] = i
err = binary.Write(inputBuffer, binary.BigEndian, weakChecksum)
assert.Nil(t, err)
n, err := inputBuffer.Write(signatureData.strongChecksums[i])
assert.Nil(t, err)
assert.Equal(t, len(signatureData.strongChecksums[i]), n)
}
actualSignature, err := ReadSignature(inputBuffer)
assert.Nil(t, err)
assert.Equal(t, expectedSignature, actualSignature)
}
}