github.com/ader1990/go@v0.0.0-20140630135419-8c24447fa791/src/pkg/compress/zlib/reader_test.go (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package zlib
     6  
     7  import (
     8  	"bytes"
     9  	"io"
    10  	"testing"
    11  )
    12  
    13  type zlibTest struct {
    14  	desc       string
    15  	raw        string
    16  	compressed []byte
    17  	dict       []byte
    18  	err        error
    19  }
    20  
    21  // Compare-to-golden test data was generated by the ZLIB example program at
    22  // http://www.zlib.net/zpipe.c
    23  
    24  var zlibTests = []zlibTest{
    25  	{
    26  		"empty",
    27  		"",
    28  		[]byte{0x78, 0x9c, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01},
    29  		nil,
    30  		nil,
    31  	},
    32  	{
    33  		"goodbye",
    34  		"goodbye, world",
    35  		[]byte{
    36  			0x78, 0x9c, 0x4b, 0xcf, 0xcf, 0x4f, 0x49, 0xaa,
    37  			0x4c, 0xd5, 0x51, 0x28, 0xcf, 0x2f, 0xca, 0x49,
    38  			0x01, 0x00, 0x28, 0xa5, 0x05, 0x5e,
    39  		},
    40  		nil,
    41  		nil,
    42  	},
    43  	{
    44  		"bad header",
    45  		"",
    46  		[]byte{0x78, 0x9f, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01},
    47  		nil,
    48  		ErrHeader,
    49  	},
    50  	{
    51  		"bad checksum",
    52  		"",
    53  		[]byte{0x78, 0x9c, 0x03, 0x00, 0x00, 0x00, 0x00, 0xff},
    54  		nil,
    55  		ErrChecksum,
    56  	},
    57  	{
    58  		"not enough data",
    59  		"",
    60  		[]byte{0x78, 0x9c, 0x03, 0x00, 0x00, 0x00},
    61  		nil,
    62  		io.ErrUnexpectedEOF,
    63  	},
    64  	{
    65  		"excess data is silently ignored",
    66  		"",
    67  		[]byte{
    68  			0x78, 0x9c, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01,
    69  			0x78, 0x9c, 0xff,
    70  		},
    71  		nil,
    72  		nil,
    73  	},
    74  	{
    75  		"dictionary",
    76  		"Hello, World!\n",
    77  		[]byte{
    78  			0x78, 0xbb, 0x1c, 0x32, 0x04, 0x27, 0xf3, 0x00,
    79  			0xb1, 0x75, 0x20, 0x1c, 0x45, 0x2e, 0x00, 0x24,
    80  			0x12, 0x04, 0x74,
    81  		},
    82  		[]byte{
    83  			0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x0a,
    84  		},
    85  		nil,
    86  	},
    87  	{
    88  		"wrong dictionary",
    89  		"",
    90  		[]byte{
    91  			0x78, 0xbb, 0x1c, 0x32, 0x04, 0x27, 0xf3, 0x00,
    92  			0xb1, 0x75, 0x20, 0x1c, 0x45, 0x2e, 0x00, 0x24,
    93  			0x12, 0x04, 0x74,
    94  		},
    95  		[]byte{
    96  			0x48, 0x65, 0x6c, 0x6c,
    97  		},
    98  		ErrDictionary,
    99  	},
   100  }
   101  
   102  func TestDecompressor(t *testing.T) {
   103  	b := new(bytes.Buffer)
   104  	for _, tt := range zlibTests {
   105  		in := bytes.NewReader(tt.compressed)
   106  		zlib, err := NewReaderDict(in, tt.dict)
   107  		if err != nil {
   108  			if err != tt.err {
   109  				t.Errorf("%s: NewReader: %s", tt.desc, err)
   110  			}
   111  			continue
   112  		}
   113  		defer zlib.Close()
   114  		b.Reset()
   115  		n, err := io.Copy(b, zlib)
   116  		if err != nil {
   117  			if err != tt.err {
   118  				t.Errorf("%s: io.Copy: %v want %v", tt.desc, err, tt.err)
   119  			}
   120  			continue
   121  		}
   122  		s := b.String()
   123  		if s != tt.raw {
   124  			t.Errorf("%s: got %d-byte %q want %d-byte %q", tt.desc, n, s, len(tt.raw), tt.raw)
   125  		}
   126  	}
   127  }