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// Copyright 2016, Joe Tsai. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
// +build gofuzz
package bzip2_bwt
import (
"bytes"
"hash/adler32"
"github.com/dsnet/compress/bzip2"
)
func Fuzz(data []byte) int {
if len(data) == 0 {
return -1
}
testReverse(data)
testRoundTrip(data)
return 0
}
// testReverse verifies that we can reverse the BWT on any arbitrary input
// so long as we choose a valid origin pointer.
func testReverse(data []byte) {
data = append([]byte(nil), data...) // Make copy of data
ptr := int(adler32.Checksum(data)) % len(data)
bzip2.ReverseBWT(data, ptr)
}
// testRoundTrip verifies that a round-trip BWT faithfully reproduces the
// input data set.
func testRoundTrip(want []byte) {
got := append([]byte(nil), want...)
ptr := bzip2.ForwardBWT(got)
bzip2.ReverseBWT(got, ptr)
if ptr < 0 || ptr >= len(want) {
panic("invalid origin pointer")
}
if !bytes.Equal(got, want) {
panic("mismatching bytes")
}
}
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