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