github.com/slayercat/go@v0.0.0-20170428012452-c51559813f61/src/encoding/hex/hex_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 hex
     6  
     7  import (
     8  	"bytes"
     9  	"fmt"
    10  	"testing"
    11  )
    12  
    13  type encDecTest struct {
    14  	enc string
    15  	dec []byte
    16  }
    17  
    18  var encDecTests = []encDecTest{
    19  	{"", []byte{}},
    20  	{"0001020304050607", []byte{0, 1, 2, 3, 4, 5, 6, 7}},
    21  	{"08090a0b0c0d0e0f", []byte{8, 9, 10, 11, 12, 13, 14, 15}},
    22  	{"f0f1f2f3f4f5f6f7", []byte{0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7}},
    23  	{"f8f9fafbfcfdfeff", []byte{0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}},
    24  	{"67", []byte{'g'}},
    25  	{"e3a1", []byte{0xe3, 0xa1}},
    26  }
    27  
    28  func TestEncode(t *testing.T) {
    29  	for i, test := range encDecTests {
    30  		dst := make([]byte, EncodedLen(len(test.dec)))
    31  		n := Encode(dst, test.dec)
    32  		if n != len(dst) {
    33  			t.Errorf("#%d: bad return value: got: %d want: %d", i, n, len(dst))
    34  		}
    35  		if string(dst) != test.enc {
    36  			t.Errorf("#%d: got: %#v want: %#v", i, dst, test.enc)
    37  		}
    38  	}
    39  }
    40  
    41  func TestDecode(t *testing.T) {
    42  	// Case for decoding uppercase hex characters, since
    43  	// Encode always uses lowercase.
    44  	decTests := append(encDecTests, encDecTest{"F8F9FAFBFCFDFEFF", []byte{0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}})
    45  	for i, test := range decTests {
    46  		dst := make([]byte, DecodedLen(len(test.enc)))
    47  		n, err := Decode(dst, []byte(test.enc))
    48  		if err != nil {
    49  			t.Errorf("#%d: bad return value: got:%d want:%d", i, n, len(dst))
    50  		} else if !bytes.Equal(dst, test.dec) {
    51  			t.Errorf("#%d: got: %#v want: %#v", i, dst, test.dec)
    52  		}
    53  	}
    54  }
    55  
    56  func TestEncodeToString(t *testing.T) {
    57  	for i, test := range encDecTests {
    58  		s := EncodeToString(test.dec)
    59  		if s != test.enc {
    60  			t.Errorf("#%d got:%s want:%s", i, s, test.enc)
    61  		}
    62  	}
    63  }
    64  
    65  func TestDecodeString(t *testing.T) {
    66  	for i, test := range encDecTests {
    67  		dst, err := DecodeString(test.enc)
    68  		if err != nil {
    69  			t.Errorf("#%d: unexpected err value: %s", i, err)
    70  			continue
    71  		}
    72  		if !bytes.Equal(dst, test.dec) {
    73  			t.Errorf("#%d: got: %#v want: #%v", i, dst, test.dec)
    74  		}
    75  	}
    76  }
    77  
    78  type errTest struct {
    79  	in  string
    80  	err string
    81  }
    82  
    83  var errTests = []errTest{
    84  	{"0", "encoding/hex: odd length hex string"},
    85  	{"0g", "encoding/hex: invalid byte: U+0067 'g'"},
    86  	{"00gg", "encoding/hex: invalid byte: U+0067 'g'"},
    87  	{"0\x01", "encoding/hex: invalid byte: U+0001"},
    88  }
    89  
    90  func TestInvalidErr(t *testing.T) {
    91  	for i, test := range errTests {
    92  		dst := make([]byte, DecodedLen(len(test.in)))
    93  		_, err := Decode(dst, []byte(test.in))
    94  		if err == nil {
    95  			t.Errorf("#%d: expected error; got none", i)
    96  		} else if err.Error() != test.err {
    97  			t.Errorf("#%d: got: %v want: %v", i, err, test.err)
    98  		}
    99  	}
   100  }
   101  
   102  func TestInvalidStringErr(t *testing.T) {
   103  	for i, test := range errTests {
   104  		_, err := DecodeString(test.in)
   105  		if err == nil {
   106  			t.Errorf("#%d: expected error; got none", i)
   107  		} else if err.Error() != test.err {
   108  			t.Errorf("#%d: got: %v want: %v", i, err, test.err)
   109  		}
   110  	}
   111  }
   112  
   113  func TestDumper(t *testing.T) {
   114  	var in [40]byte
   115  	for i := range in {
   116  		in[i] = byte(i + 30)
   117  	}
   118  
   119  	for stride := 1; stride < len(in); stride++ {
   120  		var out bytes.Buffer
   121  		dumper := Dumper(&out)
   122  		done := 0
   123  		for done < len(in) {
   124  			todo := done + stride
   125  			if todo > len(in) {
   126  				todo = len(in)
   127  			}
   128  			dumper.Write(in[done:todo])
   129  			done = todo
   130  		}
   131  
   132  		dumper.Close()
   133  		if !bytes.Equal(out.Bytes(), expectedHexDump) {
   134  			t.Errorf("stride: %d failed. got:\n%s\nwant:\n%s", stride, out.Bytes(), expectedHexDump)
   135  		}
   136  	}
   137  }
   138  
   139  func TestDump(t *testing.T) {
   140  	var in [40]byte
   141  	for i := range in {
   142  		in[i] = byte(i + 30)
   143  	}
   144  
   145  	out := []byte(Dump(in[:]))
   146  	if !bytes.Equal(out, expectedHexDump) {
   147  		t.Errorf("got:\n%s\nwant:\n%s", out, expectedHexDump)
   148  	}
   149  }
   150  
   151  var expectedHexDump = []byte(`00000000  1e 1f 20 21 22 23 24 25  26 27 28 29 2a 2b 2c 2d  |.. !"#$%&'()*+,-|
   152  00000010  2e 2f 30 31 32 33 34 35  36 37 38 39 3a 3b 3c 3d  |./0123456789:;<=|
   153  00000020  3e 3f 40 41 42 43 44 45                           |>?@ABCDE|
   154  `)
   155  
   156  var sink []byte
   157  
   158  func BenchmarkEncode(b *testing.B) {
   159  	for _, size := range []int{256, 1024, 4096, 16384} {
   160  		src := bytes.Repeat([]byte{2, 3, 5, 7, 9, 11, 13, 17}, size/8)
   161  		sink = make([]byte, 2*size)
   162  
   163  		b.Run(fmt.Sprintf("%v", size), func(b *testing.B) {
   164  			for i := 0; i < b.N; i++ {
   165  				Encode(sink, src)
   166  			}
   167  		})
   168  	}
   169  }