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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [compress/] [lzw/] [writer_test.go] - Blame information for rev 747

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1 747 jeremybenn 
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package lzw
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import (
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        "io"
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        "io/ioutil"
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        "os"
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        "runtime"
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        "testing"
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)
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var filenames = []string{
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        "../testdata/e.txt",
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        "../testdata/pi.txt",
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}
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// testFile tests that compressing and then decompressing the given file with
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// the given options yields equivalent bytes to the original file.
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func testFile(t *testing.T, fn string, order Order, litWidth int) {
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        // Read the file, as golden output.
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        golden, err := os.Open(fn)
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        if err != nil {
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                t.Errorf("%s (order=%d litWidth=%d): %v", fn, order, litWidth, err)
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                return
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        }
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        defer golden.Close()
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        // Read the file again, and push it through a pipe that compresses at the write end, and decompresses at the read end.
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        raw, err := os.Open(fn)
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        if err != nil {
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                t.Errorf("%s (order=%d litWidth=%d): %v", fn, order, litWidth, err)
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                return
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        }
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        piper, pipew := io.Pipe()
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        defer piper.Close()
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        go func() {
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                defer raw.Close()
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                defer pipew.Close()
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                lzww := NewWriter(pipew, order, litWidth)
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                defer lzww.Close()
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                var b [4096]byte
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                for {
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                        n, err0 := raw.Read(b[:])
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                        if err0 != nil && err0 != io.EOF {
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                                t.Errorf("%s (order=%d litWidth=%d): %v", fn, order, litWidth, err0)
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                                return
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                        }
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                        _, err1 := lzww.Write(b[:n])
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                        if err1 != nil {
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                                t.Errorf("%s (order=%d litWidth=%d): %v", fn, order, litWidth, err1)
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                                return
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                        }
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                        if err0 == io.EOF {
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                                break
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                        }
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                }
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        }()
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        lzwr := NewReader(piper, order, litWidth)
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        defer lzwr.Close()
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        // Compare the two.
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        b0, err0 := ioutil.ReadAll(golden)
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        b1, err1 := ioutil.ReadAll(lzwr)
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        if err0 != nil {
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                t.Errorf("%s (order=%d litWidth=%d): %v", fn, order, litWidth, err0)
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                return
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        }
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        if err1 != nil {
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                t.Errorf("%s (order=%d litWidth=%d): %v", fn, order, litWidth, err1)
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                return
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        }
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        if len(b1) != len(b0) {
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                t.Errorf("%s (order=%d litWidth=%d): length mismatch %d != %d", fn, order, litWidth, len(b1), len(b0))
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                return
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        }
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        for i := 0; i < len(b0); i++ {
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                if b1[i] != b0[i] {
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                        t.Errorf("%s (order=%d litWidth=%d): mismatch at %d, 0x%02x != 0x%02x\n", fn, order, litWidth, i, b1[i], b0[i])
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                        return
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                }
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        }
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}
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func TestWriter(t *testing.T) {
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        for _, filename := range filenames {
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                for _, order := range [...]Order{LSB, MSB} {
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                        // The test data "2.71828 etcetera" is ASCII text requiring at least 6 bits.
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                        for _, litWidth := range [...]int{6, 7, 8} {
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                                testFile(t, filename, order, litWidth)
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                        }
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                }
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        }
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}
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func benchmarkEncoder(b *testing.B, n int) {
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        b.StopTimer()
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        b.SetBytes(int64(n))
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        buf0, _ := ioutil.ReadFile("../testdata/e.txt")
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        buf0 = buf0[:10000]
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        buf1 := make([]byte, n)
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        for i := 0; i < n; i += len(buf0) {
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                copy(buf1[i:], buf0)
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        }
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        buf0 = nil
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        runtime.GC()
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        b.StartTimer()
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        for i := 0; i < b.N; i++ {
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                w := NewWriter(ioutil.Discard, LSB, 8)
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                w.Write(buf1)
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                w.Close()
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        }
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}
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func BenchmarkEncoder1e4(b *testing.B) {
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        benchmarkEncoder(b, 1e4)
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}
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func BenchmarkEncoder1e5(b *testing.B) {
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        benchmarkEncoder(b, 1e5)
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}
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func BenchmarkEncoder1e6(b *testing.B) {
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        benchmarkEncoder(b, 1e6)
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}

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