deflate_test.go 14.6 KB
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package flate

import (
	"bytes";
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	"fmt";
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	"io/ioutil";
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	"os";
	"testing";
)

type deflateTest struct {
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	in	[]byte;
	level	int;
	out	[]byte;
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}

type deflateInflateTest struct {
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	in []byte;
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}

type reverseBitsTest struct {
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	in		uint16;
	bitCount	uint8;
	out		uint16;
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}

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var deflateTests = []*deflateTest{
	&deflateTest{[]byte{}, 0, []byte{1, 0, 0, 255, 255}},
	&deflateTest{[]byte{0x11}, -1, []byte{18, 4, 4, 0, 0, 255, 255}},
	&deflateTest{[]byte{0x11}, DefaultCompression, []byte{18, 4, 4, 0, 0, 255, 255}},
	&deflateTest{[]byte{0x11}, 4, []byte{18, 4, 4, 0, 0, 255, 255}},
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	&deflateTest{[]byte{0x11}, 0, []byte{0, 1, 0, 254, 255, 17, 1, 0, 0, 255, 255}},
	&deflateTest{[]byte{0x11, 0x12}, 0, []byte{0, 2, 0, 253, 255, 17, 18, 1, 0, 0, 255, 255}},
	&deflateTest{[]byte{0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}, 0,
		[]byte{0, 8, 0, 247, 255, 17, 17, 17, 17, 17, 17, 17, 17, 1, 0, 0, 255, 255},
	},
	&deflateTest{[]byte{}, 1, []byte{1, 0, 0, 255, 255}},
	&deflateTest{[]byte{0x11}, 1, []byte{18, 4, 4, 0, 0, 255, 255}},
	&deflateTest{[]byte{0x11, 0x12}, 1, []byte{18, 20, 2, 4, 0, 0, 255, 255}},
	&deflateTest{[]byte{0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}, 1, []byte{18, 132, 2, 64, 0, 0, 0, 255, 255}},
	&deflateTest{[]byte{}, 9, []byte{1, 0, 0, 255, 255}},
	&deflateTest{[]byte{0x11}, 9, []byte{18, 4, 4, 0, 0, 255, 255}},
	&deflateTest{[]byte{0x11, 0x12}, 9, []byte{18, 20, 2, 4, 0, 0, 255, 255}},
	&deflateTest{[]byte{0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}, 9, []byte{18, 132, 2, 64, 0, 0, 0, 255, 255}},
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}

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var deflateInflateTests = []*deflateInflateTest{
	&deflateInflateTest{[]byte{}},
	&deflateInflateTest{[]byte{0x11}},
	&deflateInflateTest{[]byte{0x11, 0x12}},
	&deflateInflateTest{[]byte{0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11}},
	&deflateInflateTest{[]byte{0x11, 0x10, 0x13, 0x41, 0x21, 0x21, 0x41, 0x13, 0x87, 0x78, 0x13}},
	&deflateInflateTest{getLargeDataChunk()},
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}

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var reverseBitsTests = []*reverseBitsTest{
	&reverseBitsTest{1, 1, 1},
	&reverseBitsTest{1, 2, 2},
	&reverseBitsTest{1, 3, 4},
	&reverseBitsTest{1, 4, 8},
	&reverseBitsTest{1, 5, 16},
	&reverseBitsTest{17, 5, 17},
	&reverseBitsTest{257, 9, 257},
	&reverseBitsTest{29, 5, 23},
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}

func getLargeDataChunk() []byte {
	result := make([]byte, 100000);
	for i := range result {
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		result[i] = byte(int64(i) * int64(i) & 0xFF)
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	}
	return result;
}

func TestDeflate(t *testing.T) {
	for _, h := range deflateTests {
		buffer := bytes.NewBuffer([]byte{});
		w := NewDeflater(buffer, h.level);
		w.Write(h.in);
		w.Close();
		if bytes.Compare(buffer.Bytes(), h.out) != 0 {
			t.Errorf("buffer is wrong; level = %v, buffer.Bytes() = %v, expected output = %v",
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				h.level, buffer.Bytes(), h.out)
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		}
	}
}

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func testToFromWithLevel(t *testing.T, level int, input []byte, name string) os.Error {
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	buffer := bytes.NewBuffer([]byte{});
	w := NewDeflater(buffer, level);
	w.Write(input);
	w.Close();
	inflater := NewInflater(buffer);
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	decompressed, err := ioutil.ReadAll(inflater);
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	if err != nil {
		t.Errorf("reading inflater: %s", err);
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		return err;
	}
	inflater.Close();
	if bytes.Compare(input, decompressed) != 0 {
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		t.Errorf("decompress(compress(data)) != data: level=%d input=%s", level, name)
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	}
	return nil;
}

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func testToFrom(t *testing.T, input []byte, name string) {
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	for i := 0; i < 10; i++ {
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		testToFromWithLevel(t, i, input, name)
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	}
}

func TestDeflateInflate(t *testing.T) {
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	for i, h := range deflateInflateTests {
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		testToFrom(t, h.in, fmt.Sprintf("#%d", i))
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	}
}

func TestReverseBits(t *testing.T) {
	for _, h := range reverseBitsTests {
		if v := reverseBits(h.in, h.bitCount); v != h.out {
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			t.Errorf("reverseBits(%v,%v) = %v, want %v",
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				h.in, h.bitCount, v, h.out)
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		}
	}
}

func TestDeflateInflateString(t *testing.T) {
	gold := bytes.NewBufferString(getEdata()).Bytes();
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	testToFromWithLevel(t, 1, gold, "2.718281828...");
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}

func getEdata() string {
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	return "2.718281828459045235360287471352662497757247093699959574966967627724076630353547" +
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		"9"
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}