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-rw-r--r--src/encoding/hex/hex_test.go277
1 files changed, 277 insertions, 0 deletions
diff --git a/src/encoding/hex/hex_test.go b/src/encoding/hex/hex_test.go
new file mode 100644
index 0000000..a820fe7
--- /dev/null
+++ b/src/encoding/hex/hex_test.go
@@ -0,0 +1,277 @@
+// 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 hex
+
+import (
+ "bytes"
+ "fmt"
+ "io"
+ "strings"
+ "testing"
+)
+
+type encDecTest struct {
+ enc string
+ dec []byte
+}
+
+var encDecTests = []encDecTest{
+ {"", []byte{}},
+ {"0001020304050607", []byte{0, 1, 2, 3, 4, 5, 6, 7}},
+ {"08090a0b0c0d0e0f", []byte{8, 9, 10, 11, 12, 13, 14, 15}},
+ {"f0f1f2f3f4f5f6f7", []byte{0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7}},
+ {"f8f9fafbfcfdfeff", []byte{0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}},
+ {"67", []byte{'g'}},
+ {"e3a1", []byte{0xe3, 0xa1}},
+}
+
+func TestEncode(t *testing.T) {
+ for i, test := range encDecTests {
+ dst := make([]byte, EncodedLen(len(test.dec)))
+ n := Encode(dst, test.dec)
+ if n != len(dst) {
+ t.Errorf("#%d: bad return value: got: %d want: %d", i, n, len(dst))
+ }
+ if string(dst) != test.enc {
+ t.Errorf("#%d: got: %#v want: %#v", i, dst, test.enc)
+ }
+ }
+}
+
+func TestDecode(t *testing.T) {
+ // Case for decoding uppercase hex characters, since
+ // Encode always uses lowercase.
+ decTests := append(encDecTests, encDecTest{"F8F9FAFBFCFDFEFF", []byte{0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}})
+ for i, test := range decTests {
+ dst := make([]byte, DecodedLen(len(test.enc)))
+ n, err := Decode(dst, []byte(test.enc))
+ if err != nil {
+ t.Errorf("#%d: bad return value: got:%d want:%d", i, n, len(dst))
+ } else if !bytes.Equal(dst, test.dec) {
+ t.Errorf("#%d: got: %#v want: %#v", i, dst, test.dec)
+ }
+ }
+}
+
+func TestEncodeToString(t *testing.T) {
+ for i, test := range encDecTests {
+ s := EncodeToString(test.dec)
+ if s != test.enc {
+ t.Errorf("#%d got:%s want:%s", i, s, test.enc)
+ }
+ }
+}
+
+func TestDecodeString(t *testing.T) {
+ for i, test := range encDecTests {
+ dst, err := DecodeString(test.enc)
+ if err != nil {
+ t.Errorf("#%d: unexpected err value: %s", i, err)
+ continue
+ }
+ if !bytes.Equal(dst, test.dec) {
+ t.Errorf("#%d: got: %#v want: #%v", i, dst, test.dec)
+ }
+ }
+}
+
+var errTests = []struct {
+ in string
+ out string
+ err error
+}{
+ {"", "", nil},
+ {"0", "", ErrLength},
+ {"zd4aa", "", InvalidByteError('z')},
+ {"d4aaz", "\xd4\xaa", InvalidByteError('z')},
+ {"30313", "01", ErrLength},
+ {"0g", "", InvalidByteError('g')},
+ {"00gg", "\x00", InvalidByteError('g')},
+ {"0\x01", "", InvalidByteError('\x01')},
+ {"ffeed", "\xff\xee", ErrLength},
+}
+
+func TestDecodeErr(t *testing.T) {
+ for _, tt := range errTests {
+ out := make([]byte, len(tt.in)+10)
+ n, err := Decode(out, []byte(tt.in))
+ if string(out[:n]) != tt.out || err != tt.err {
+ t.Errorf("Decode(%q) = %q, %v, want %q, %v", tt.in, string(out[:n]), err, tt.out, tt.err)
+ }
+ }
+}
+
+func TestDecodeStringErr(t *testing.T) {
+ for _, tt := range errTests {
+ out, err := DecodeString(tt.in)
+ if string(out) != tt.out || err != tt.err {
+ t.Errorf("DecodeString(%q) = %q, %v, want %q, %v", tt.in, out, err, tt.out, tt.err)
+ }
+ }
+}
+
+func TestEncoderDecoder(t *testing.T) {
+ for _, multiplier := range []int{1, 128, 192} {
+ for _, test := range encDecTests {
+ input := bytes.Repeat(test.dec, multiplier)
+ output := strings.Repeat(test.enc, multiplier)
+
+ var buf bytes.Buffer
+ enc := NewEncoder(&buf)
+ r := struct{ io.Reader }{bytes.NewReader(input)} // io.Reader only; not io.WriterTo
+ if n, err := io.CopyBuffer(enc, r, make([]byte, 7)); n != int64(len(input)) || err != nil {
+ t.Errorf("encoder.Write(%q*%d) = (%d, %v), want (%d, nil)", test.dec, multiplier, n, err, len(input))
+ continue
+ }
+
+ if encDst := buf.String(); encDst != output {
+ t.Errorf("buf(%q*%d) = %v, want %v", test.dec, multiplier, encDst, output)
+ continue
+ }
+
+ dec := NewDecoder(&buf)
+ var decBuf bytes.Buffer
+ w := struct{ io.Writer }{&decBuf} // io.Writer only; not io.ReaderFrom
+ if _, err := io.CopyBuffer(w, dec, make([]byte, 7)); err != nil || decBuf.Len() != len(input) {
+ t.Errorf("decoder.Read(%q*%d) = (%d, %v), want (%d, nil)", test.enc, multiplier, decBuf.Len(), err, len(input))
+ }
+
+ if !bytes.Equal(decBuf.Bytes(), input) {
+ t.Errorf("decBuf(%q*%d) = %v, want %v", test.dec, multiplier, decBuf.Bytes(), input)
+ continue
+ }
+ }
+ }
+}
+
+func TestDecoderErr(t *testing.T) {
+ for _, tt := range errTests {
+ dec := NewDecoder(strings.NewReader(tt.in))
+ out, err := io.ReadAll(dec)
+ wantErr := tt.err
+ // Decoder is reading from stream, so it reports io.ErrUnexpectedEOF instead of ErrLength.
+ if wantErr == ErrLength {
+ wantErr = io.ErrUnexpectedEOF
+ }
+ if string(out) != tt.out || err != wantErr {
+ t.Errorf("NewDecoder(%q) = %q, %v, want %q, %v", tt.in, out, err, tt.out, wantErr)
+ }
+ }
+}
+
+func TestDumper(t *testing.T) {
+ var in [40]byte
+ for i := range in {
+ in[i] = byte(i + 30)
+ }
+
+ for stride := 1; stride < len(in); stride++ {
+ var out bytes.Buffer
+ dumper := Dumper(&out)
+ done := 0
+ for done < len(in) {
+ todo := done + stride
+ if todo > len(in) {
+ todo = len(in)
+ }
+ dumper.Write(in[done:todo])
+ done = todo
+ }
+
+ dumper.Close()
+ if !bytes.Equal(out.Bytes(), expectedHexDump) {
+ t.Errorf("stride: %d failed. got:\n%s\nwant:\n%s", stride, out.Bytes(), expectedHexDump)
+ }
+ }
+}
+
+func TestDumper_doubleclose(t *testing.T) {
+ var out strings.Builder
+ dumper := Dumper(&out)
+
+ dumper.Write([]byte(`gopher`))
+ dumper.Close()
+ dumper.Close()
+ dumper.Write([]byte(`gopher`))
+ dumper.Close()
+
+ expected := "00000000 67 6f 70 68 65 72 |gopher|\n"
+ if out.String() != expected {
+ t.Fatalf("got:\n%#v\nwant:\n%#v", out.String(), expected)
+ }
+}
+
+func TestDumper_earlyclose(t *testing.T) {
+ var out strings.Builder
+ dumper := Dumper(&out)
+
+ dumper.Close()
+ dumper.Write([]byte(`gopher`))
+
+ expected := ""
+ if out.String() != expected {
+ t.Fatalf("got:\n%#v\nwant:\n%#v", out.String(), expected)
+ }
+}
+
+func TestDump(t *testing.T) {
+ var in [40]byte
+ for i := range in {
+ in[i] = byte(i + 30)
+ }
+
+ out := []byte(Dump(in[:]))
+ if !bytes.Equal(out, expectedHexDump) {
+ t.Errorf("got:\n%s\nwant:\n%s", out, expectedHexDump)
+ }
+}
+
+var expectedHexDump = []byte(`00000000 1e 1f 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d |.. !"#$%&'()*+,-|
+00000010 2e 2f 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d |./0123456789:;<=|
+00000020 3e 3f 40 41 42 43 44 45 |>?@ABCDE|
+`)
+
+var sink []byte
+
+func BenchmarkEncode(b *testing.B) {
+ for _, size := range []int{256, 1024, 4096, 16384} {
+ src := bytes.Repeat([]byte{2, 3, 5, 7, 9, 11, 13, 17}, size/8)
+ sink = make([]byte, 2*size)
+
+ b.Run(fmt.Sprintf("%v", size), func(b *testing.B) {
+ b.SetBytes(int64(size))
+ for i := 0; i < b.N; i++ {
+ Encode(sink, src)
+ }
+ })
+ }
+}
+
+func BenchmarkDecode(b *testing.B) {
+ for _, size := range []int{256, 1024, 4096, 16384} {
+ src := bytes.Repeat([]byte{'2', 'b', '7', '4', '4', 'f', 'a', 'a'}, size/8)
+ sink = make([]byte, size/2)
+
+ b.Run(fmt.Sprintf("%v", size), func(b *testing.B) {
+ b.SetBytes(int64(size))
+ for i := 0; i < b.N; i++ {
+ Decode(sink, src)
+ }
+ })
+ }
+}
+
+func BenchmarkDump(b *testing.B) {
+ for _, size := range []int{256, 1024, 4096, 16384} {
+ src := bytes.Repeat([]byte{2, 3, 5, 7, 9, 11, 13, 17}, size/8)
+
+ b.Run(fmt.Sprintf("%v", size), func(b *testing.B) {
+ b.SetBytes(int64(size))
+ for i := 0; i < b.N; i++ {
+ Dump(src)
+ }
+ })
+ }
+}