Vendor used libs

vendor/github.com/dsnet/compress/bzip2/fuzz_on.go

@@ -0,0 +1,77 @@
+// 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
+
+// This file exists to export internal implementation details for fuzz testing.
+
+package bzip2
+
+func ForwardBWT(buf []byte) (ptr int) {
+	var bwt burrowsWheelerTransform
+	return bwt.Encode(buf)
+}
+
+func ReverseBWT(buf []byte, ptr int) {
+	var bwt burrowsWheelerTransform
+	bwt.Decode(buf, ptr)
+}
+
+type fuzzReader struct {
+	Checksums Checksums
+}
+
+// updateChecksum updates Checksums.
+//
+// If a valid pos is provided, it appends the (pos, val) pair to the slice.
+// Otherwise, it will update the last record with the new value.
+func (fr *fuzzReader) updateChecksum(pos int64, val uint32) {
+	if pos >= 0 {
+		fr.Checksums = append(fr.Checksums, Checksum{pos, val})
+	} else {
+		fr.Checksums[len(fr.Checksums)-1].Value = val
+	}
+}
+
+type Checksum struct {
+	Offset int64  // Bit offset of the checksum
+	Value  uint32 // Checksum value
+}
+
+type Checksums []Checksum
+
+// Apply overwrites all checksum fields in d with the ones in cs.
+func (cs Checksums) Apply(d []byte) []byte {
+	d = append([]byte(nil), d...)
+	for _, c := range cs {
+		setU32(d, c.Offset, c.Value)
+	}
+	return d
+}
+
+func setU32(d []byte, pos int64, val uint32) {
+	for i := uint(0); i < 32; i++ {
+		bpos := uint64(pos) + uint64(i)
+		d[bpos/8] &= ^byte(1 << (7 - bpos%8))
+		d[bpos/8] |= byte(val>>(31-i)) << (7 - bpos%8)
+	}
+}
+
+// Verify checks that all checksum fields in d matches those in cs.
+func (cs Checksums) Verify(d []byte) bool {
+	for _, c := range cs {
+		if getU32(d, c.Offset) != c.Value {
+			return false
+		}
+	}
+	return true
+}
+
+func getU32(d []byte, pos int64) (val uint32) {
+	for i := uint(0); i < 32; i++ {
+		bpos := uint64(pos) + uint64(i)
+		val |= (uint32(d[bpos/8] >> (7 - bpos%8))) << (31 - i)
+	}
+	return val
+}