// 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";
"fmt";
"io/ioutil";
"os";
"testing";
)
type deflateTest struct {
in []byte;
level int;
out []byte;
}
type deflateInflateTest struct {
in []byte;
}
type reverseBitsTest struct {
in uint16;
bitCount uint8;
out uint16;
}
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}},
&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}},
}
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()},
}
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},
}
func getLargeDataChunk() []byte {
result := make([]byte, 100000);
for i := range result {
result[i] = byte(int64(i) * int64(i) & 0xFF)
}
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",
h.level, buffer.Bytes(), h.out)
}
}
}
func testToFromWithLevel(t *testing.T, level int, input []byte, name string) os.Error {
buffer := bytes.NewBuffer([]byte{});
w := NewDeflater(buffer, level);
w.Write(input);
w.Close();
inflater := NewInflater(buffer);
decompressed, err := ioutil.ReadAll(inflater);
if err != nil {
t.Errorf("reading inflater: %s", err);
return err;
}
inflater.Close();
if bytes.Compare(input, decompressed) != 0 {
t.Errorf("decompress(compress(data)) != data: level=%d input=%s", level, name)
}
return nil;
}
func testToFrom(t *testing.T, input []byte, name string) {
for i := 0; i < 10; i++ {
testToFromWithLevel(t, i, input, name)
}
}
func TestDeflateInflate(t *testing.T) {
for i, h := range deflateInflateTests {
testToFrom(t, h.in, fmt.Sprintf("#%d", i))
}
}
func TestReverseBits(t *testing.T) {
for _, h := range reverseBitsTests {
if v := reverseBits(h.in, h.bitCount); v != h.out {
t.Errorf("reverseBits(%v,%v) = %v, want %v",
h.in, h.bitCount, v, h.out)
}
}
}
func TestDeflateInflateString(t *testing.T) {
gold := bytes.NewBufferString(getEdata()).Bytes();
testToFromWithLevel(t, 1, gold, "2.718281828...");
}
func getEdata() string {
return "2.718281828459045235360287471352662497757247093699959574966967627724076630353547" +
"59457138217852516642742746639193200305992181741359662904357290033429526059563073" +
"81323286279434907632338298807531952510190115738341879307021540891499348841675092" +
"44761460668082264800168477411853742345442437107539077744992069551702761838606261" +
"33138458300075204493382656029760673711320070932870912744374704723069697720931014" +
"16928368190255151086574637721112523897844250569536967707854499699679468644549059" +
"87931636889230098793127736178215424999229576351482208269895193668033182528869398" +
"49646510582093923982948879332036250944311730123819706841614039701983767932068328" +
"23764648042953118023287825098194558153017567173613320698112509961818815930416903" +
"51598888519345807273866738589422879228499892086805825749279610484198444363463244" +
"96848756023362482704197862320900216099023530436994184914631409343173814364054625" +
"31520961836908887070167683964243781405927145635490613031072085103837505101157477" +
"04171898610687396965521267154688957035035402123407849819334321068170121005627880" +
"23519303322474501585390473041995777709350366041699732972508868769664035557071622" +
"68447162560798826517871341951246652010305921236677194325278675398558944896970964" +
"09754591856956380236370162112047742722836489613422516445078182442352948636372141" +
"74023889344124796357437026375529444833799801612549227850925778256209262264832627" +
"79333865664816277251640191059004916449982893150566047258027786318641551956532442" +
"58698294695930801915298721172556347546396447910145904090586298496791287406870504" +
"89585867174798546677575732056812884592054133405392200011378630094556068816674001" +
"69842055804033637953764520304024322566135278369511778838638744396625322498506549" +
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"52111513683506275260232648472870392076431005958411661205452970302364725492966693" +
"81151373227536450988890313602057248176585118063036442812314965507047510254465011" +
"72721155519486685080036853228183152196003735625279449515828418829478761085263981" +
"39559900673764829224437528718462457803619298197139914756448826260390338144182326" +
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"07943800566633648843650891448055710397652146960276625835990519870423001794655367" +
"9"
}
|
