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// Copyright 2015, 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.
package brotli
import (
"bytes"
"hash/crc32"
"testing"
)
func TestTableCRC(t *testing.T) {
// Convert transformLUT to byte array according to Appendix B of the RFC.
var transformBuf bytes.Buffer
for _, t := range transformLUT {
transformBuf.WriteString(t.prefix + "\x00")
transformBuf.WriteByte(byte(t.transform))
transformBuf.WriteString(t.suffix + "\x00")
}
vectors := []struct {
crc uint32
buf []byte
}{
{crc: 0x5136cb04, buf: dictLUT[:]},
{crc: 0x8e91efb7, buf: contextLUT0[:]},
{crc: 0xd01a32f4, buf: contextLUT1[:]},
{crc: 0x0dd7a0d6, buf: contextLUT2[:]},
{crc: 0x3d965f81, buf: transformBuf.Bytes()},
}
for i, v := range vectors {
crc := crc32.ChecksumIEEE(v.buf)
if crc != v.crc {
t.Errorf("test %d, CRC-32 mismatch: got %08x, want %08x", i, crc, v.crc)
}
}
}
// This package relies on dynamic generation of LUTs to reduce the static
// binary size. This benchmark attempts to measure the startup cost of init.
// This benchmark is not thread-safe; so do not run it in parallel with other
// tests or benchmarks!
func BenchmarkInit(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
initLUTs()
}
}
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