180 lines
3.3 KiB
Go
180 lines
3.3 KiB
Go
// Copyright 2009 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 zlib
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import (
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"bytes"
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"io"
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"testing"
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)
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type zlibTest struct {
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desc string
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raw string
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compressed []byte
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dict []byte
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err error
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}
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// Compare-to-golden test data was generated by the ZLIB example program at
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// http://www.zlib.net/zpipe.c
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var zlibTests = []zlibTest{
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{
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"truncated empty",
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"",
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[]byte{},
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nil,
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io.ErrUnexpectedEOF,
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},
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{
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"truncated dict",
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"",
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[]byte{0x78, 0xbb},
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[]byte{0x00},
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io.ErrUnexpectedEOF,
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},
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{
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"truncated checksum",
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"",
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[]byte{0x78, 0xbb, 0x00, 0x01, 0x00, 0x01, 0xca, 0x48,
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0xcd, 0xc9, 0xc9, 0xd7, 0x51, 0x28, 0xcf, 0x2f,
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0xca, 0x49, 0x01, 0x04, 0x00, 0x00, 0xff, 0xff,
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},
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[]byte{0x00},
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io.ErrUnexpectedEOF,
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},
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{
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"empty",
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"",
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[]byte{0x78, 0x9c, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01},
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nil,
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nil,
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},
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{
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"goodbye",
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"goodbye, world",
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[]byte{
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0x78, 0x9c, 0x4b, 0xcf, 0xcf, 0x4f, 0x49, 0xaa,
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0x4c, 0xd5, 0x51, 0x28, 0xcf, 0x2f, 0xca, 0x49,
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0x01, 0x00, 0x28, 0xa5, 0x05, 0x5e,
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},
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nil,
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nil,
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},
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{
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"bad header",
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"",
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[]byte{0x78, 0x9f, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01},
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nil,
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ErrHeader,
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},
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{
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"bad checksum",
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"",
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[]byte{0x78, 0x9c, 0x03, 0x00, 0x00, 0x00, 0x00, 0xff},
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nil,
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ErrChecksum,
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},
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{
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"not enough data",
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"",
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[]byte{0x78, 0x9c, 0x03, 0x00, 0x00, 0x00},
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nil,
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io.ErrUnexpectedEOF,
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},
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{
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"excess data is silently ignored",
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"",
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[]byte{
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0x78, 0x9c, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01,
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0x78, 0x9c, 0xff,
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},
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nil,
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nil,
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},
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{
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"dictionary",
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"Hello, World!\n",
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[]byte{
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0x78, 0xbb, 0x1c, 0x32, 0x04, 0x27, 0xf3, 0x00,
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0xb1, 0x75, 0x20, 0x1c, 0x45, 0x2e, 0x00, 0x24,
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0x12, 0x04, 0x74,
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},
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[]byte{
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0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x0a,
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},
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nil,
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},
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{
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"wrong dictionary",
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"",
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[]byte{
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0x78, 0xbb, 0x1c, 0x32, 0x04, 0x27, 0xf3, 0x00,
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0xb1, 0x75, 0x20, 0x1c, 0x45, 0x2e, 0x00, 0x24,
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0x12, 0x04, 0x74,
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},
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[]byte{
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0x48, 0x65, 0x6c, 0x6c,
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},
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ErrDictionary,
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},
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{
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"truncated zlib stream amid raw-block",
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"hello",
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[]byte{
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0x78, 0x9c, 0x00, 0x0c, 0x00, 0xf3, 0xff, 0x68, 0x65, 0x6c, 0x6c, 0x6f,
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},
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nil,
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io.ErrUnexpectedEOF,
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},
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{
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"truncated zlib stream amid fixed-block",
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"He",
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[]byte{
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0x78, 0x9c, 0xf2, 0x48, 0xcd,
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},
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nil,
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io.ErrUnexpectedEOF,
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},
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}
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func TestDecompressor(t *testing.T) {
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b := new(bytes.Buffer)
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for _, tt := range zlibTests {
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in := bytes.NewReader(tt.compressed)
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zr, err := NewReaderDict(in, tt.dict)
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if err != nil {
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if err != tt.err {
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t.Errorf("%s: NewReader: %s", tt.desc, err)
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}
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continue
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}
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defer zr.Close()
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// Read and verify correctness of data.
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b.Reset()
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n, err := io.Copy(b, zr)
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if err != nil {
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if err != tt.err {
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t.Errorf("%s: io.Copy: %v want %v", tt.desc, err, tt.err)
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}
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continue
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}
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s := b.String()
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if s != tt.raw {
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t.Errorf("%s: got %d-byte %q want %d-byte %q", tt.desc, n, s, len(tt.raw), tt.raw)
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}
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// Check for sticky errors.
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if n, err := zr.Read([]byte{0}); n != 0 || err != io.EOF {
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t.Errorf("%s: Read() = (%d, %v), want (0, io.EOF)", tt.desc, n, err)
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}
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if err := zr.Close(); err != nil {
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t.Errorf("%s: Close() = %v, want nil", tt.desc, err)
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}
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}
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}
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