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encoding/hex: canonicalize error type names

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Also simplify the tests.

Fixes #2849.

R=golang-dev, bradfitz, r
CC=golang-dev
https://golang.org/cl/5643045
This commit is contained in:
Rob Pike 2012-02-08 11:53:32 +11:00
parent 5e381d3a9a
commit 92f55949f9
2 changed files with 78 additions and 123 deletions
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26
src/pkg/encoding/hex/hex.go
View File

@ -7,8 +7,9 @@ package hex
import ( import (
"bytes" "bytes"
"errors"
"fmt"
"io" "io"
"strconv"
) )
const hextable = "0123456789abcdef" const hextable = "0123456789abcdef"
@ -29,16 +30,14 @@ func Encode(dst, src []byte) int {
return len(src) * 2 return len(src) * 2
} }
// OddLengthInputError results from decoding an odd length slice. // ErrLength results from decoding an odd length slice.
type OddLengthInputError struct{} var ErrLength = errors.New("encoding/hex: odd length hex string")
func (OddLengthInputError) Error() string { return "odd length hex string" } // InvalidByteError values describe errors resulting from an invalid byte in a hex string.
type InvalidByteError byte
// InvalidHexCharError results from finding an invalid character in a hex string. func (e InvalidByteError) Error() string {
type InvalidHexCharError byte return fmt.Sprintf("encoding/hex: invalid byte: %#U", rune(e))
func (e InvalidHexCharError) Error() string {
return "invalid hex char: " + strconv.Itoa(int(e))
} }
func DecodedLen(x int) int { return x / 2 } func DecodedLen(x int) int { return x / 2 }
@ -46,21 +45,20 @@ func DecodedLen(x int) int { return x / 2 }
// Decode decodes src into DecodedLen(len(src)) bytes, returning the actual // Decode decodes src into DecodedLen(len(src)) bytes, returning the actual
// number of bytes written to dst. // number of bytes written to dst.
// //
// If Decode encounters invalid input, it returns an OddLengthInputError or an // If Decode encounters invalid input, it returns an error describing the failure.
// InvalidHexCharError.
func Decode(dst, src []byte) (int, error) { func Decode(dst, src []byte) (int, error) {
if len(src)%2 == 1 { if len(src)%2 == 1 {
return 0, OddLengthInputError{} return 0, ErrLength
} }
for i := 0; i < len(src)/2; i++ { for i := 0; i < len(src)/2; i++ {
a, ok := fromHexChar(src[i*2]) a, ok := fromHexChar(src[i*2])
if !ok { if !ok {
return 0, InvalidHexCharError(src[i*2]) return 0, InvalidByteError(src[i*2])
} }
b, ok := fromHexChar(src[i*2+1]) b, ok := fromHexChar(src[i*2+1])
if !ok { if !ok {
return 0, InvalidHexCharError(src[i*2+1]) return 0, InvalidByteError(src[i*2+1])
} }
dst[i] = (a << 4) | b dst[i] = (a << 4) | b
} }

175
src/pkg/encoding/hex/hex_test.go
View File

@ -9,141 +9,98 @@ import (
"testing" "testing"
) )
type encodeTest struct { type encDecTest struct {
in, out []byte enc string
dec []byte
} }
var encodeTests = []encodeTest{ var encDecTests = []encDecTest{
{[]byte{}, []byte{}}, {"", []byte{}},
{[]byte{0x01}, []byte{'0', '1'}}, {"0001020304050607", []byte{0, 1, 2, 3, 4, 5, 6, 7}},
{[]byte{0xff}, []byte{'f', 'f'}}, {"08090a0b0c0d0e0f", []byte{8, 9, 10, 11, 12, 13, 14, 15}},
{[]byte{0xff, 00}, []byte{'f', 'f', '0', '0'}}, {"f0f1f2f3f4f5f6f7", []byte{0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7}},
{[]byte{0}, []byte{'0', '0'}}, {"f8f9fafbfcfdfeff", []byte{0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}},
{[]byte{1}, []byte{'0', '1'}}, {"67", []byte{'g'}},
{[]byte{2}, []byte{'0', '2'}}, {"e3a1", []byte{0xe3, 0xa1}},
{[]byte{3}, []byte{'0', '3'}},
{[]byte{4}, []byte{'0', '4'}},
{[]byte{5}, []byte{'0', '5'}},
{[]byte{6}, []byte{'0', '6'}},
{[]byte{7}, []byte{'0', '7'}},
{[]byte{8}, []byte{'0', '8'}},
{[]byte{9}, []byte{'0', '9'}},
{[]byte{10}, []byte{'0', 'a'}},
{[]byte{11}, []byte{'0', 'b'}},
{[]byte{12}, []byte{'0', 'c'}},
{[]byte{13}, []byte{'0', 'd'}},
{[]byte{14}, []byte{'0', 'e'}},
{[]byte{15}, []byte{'0', 'f'}},
} }
func TestEncode(t *testing.T) { func TestEncode(t *testing.T) {
for i, test := range encodeTests { for i, test := range encDecTests {
dst := make([]byte, EncodedLen(len(test.in))) dst := make([]byte, EncodedLen(len(test.dec)))
n := Encode(dst, test.in) n := Encode(dst, test.dec)
if n != len(dst) { if n != len(dst) {
t.Errorf("#%d: bad return value: got: %d want: %d", i, n, len(dst)) t.Errorf("#%d: bad return value: got: %d want: %d", i, n, len(dst))
} }
if bytes.Compare(dst, test.out) != 0 { if string(dst) != test.enc {
t.Errorf("#%d: got: %#v want: %#v", i, dst, test.out) t.Errorf("#%d: got: %#v want: %#v", i, dst, test.enc)
} }
} }
} }
type decodeTest struct {
in, out []byte
ok bool
}
var decodeTests = []decodeTest{
{[]byte{}, []byte{}, true},
{[]byte{'0'}, []byte{}, false},
{[]byte{'0', 'g'}, []byte{}, false},
{[]byte{'0', '\x01'}, []byte{}, false},
{[]byte{'0', '0'}, []byte{0}, true},
{[]byte{'0', '1'}, []byte{1}, true},
{[]byte{'0', '2'}, []byte{2}, true},
{[]byte{'0', '3'}, []byte{3}, true},
{[]byte{'0', '4'}, []byte{4}, true},
{[]byte{'0', '5'}, []byte{5}, true},
{[]byte{'0', '6'}, []byte{6}, true},
{[]byte{'0', '7'}, []byte{7}, true},
{[]byte{'0', '8'}, []byte{8}, true},
{[]byte{'0', '9'}, []byte{9}, true},
{[]byte{'0', 'a'}, []byte{10}, true},
{[]byte{'0', 'b'}, []byte{11}, true},
{[]byte{'0', 'c'}, []byte{12}, true},
{[]byte{'0', 'd'}, []byte{13}, true},
{[]byte{'0', 'e'}, []byte{14}, true},
{[]byte{'0', 'f'}, []byte{15}, true},
{[]byte{'0', 'A'}, []byte{10}, true},
{[]byte{'0', 'B'}, []byte{11}, true},
{[]byte{'0', 'C'}, []byte{12}, true},
{[]byte{'0', 'D'}, []byte{13}, true},
{[]byte{'0', 'E'}, []byte{14}, true},
{[]byte{'0', 'F'}, []byte{15}, true},
}
func TestDecode(t *testing.T) { func TestDecode(t *testing.T) {
for i, test := range decodeTests { for i, test := range encDecTests {
dst := make([]byte, DecodedLen(len(test.in))) dst := make([]byte, DecodedLen(len(test.enc)))
n, err := Decode(dst, test.in) n, err := Decode(dst, []byte(test.enc))
if err == nil && n != len(dst) { if err != nil {
t.Errorf("#%d: bad return value: got:%d want:%d", i, n, len(dst)) t.Errorf("#%d: bad return value: got:%d want:%d", i, n, len(dst))
} } else if !bytes.Equal(dst, test.dec) {
if test.ok != (err == nil) { t.Errorf("#%d: got: %#v want: %#v", i, dst, test.dec)
t.Errorf("#%d: unexpected err value: %s", i, err)
}
if err == nil && bytes.Compare(dst, test.out) != 0 {
t.Errorf("#%d: got: %#v want: %#v", i, dst, test.out)
} }
} }
} }
type encodeStringTest struct {
in []byte
out string
}
var encodeStringTests = []encodeStringTest{
{[]byte{}, ""},
{[]byte{0}, "00"},
{[]byte{0, 1}, "0001"},
{[]byte{0, 1, 255}, "0001ff"},
}
func TestEncodeToString(t *testing.T) { func TestEncodeToString(t *testing.T) {
for i, test := range encodeStringTests { for i, test := range encDecTests {
s := EncodeToString(test.in) s := EncodeToString(test.dec)
if s != test.out { if s != test.enc {
t.Errorf("#%d got:%s want:%s", i, s, test.out) t.Errorf("#%d got:%s want:%s", i, s, test.enc)
} }
} }
} }
type decodeStringTest struct {
in string
out []byte
ok bool
}
var decodeStringTests = []decodeStringTest{
{"", []byte{}, true},
{"0", []byte{}, false},
{"00", []byte{0}, true},
{"0\x01", []byte{}, false},
{"0g", []byte{}, false},
{"00ff00", []byte{0, 255, 0}, true},
{"0000ff", []byte{0, 0, 255}, true},
}
func TestDecodeString(t *testing.T) { func TestDecodeString(t *testing.T) {
for i, test := range decodeStringTests { for i, test := range encDecTests {
dst, err := DecodeString(test.in) dst, err := DecodeString(test.enc)
if test.ok != (err == nil) { if err != nil {
t.Errorf("#%d: unexpected err value: %s", i, err) t.Errorf("#%d: unexpected err value: %s", i, err)
continue
} }
if err == nil && bytes.Compare(dst, test.out) != 0 { if bytes.Compare(dst, test.dec) != 0 {
t.Errorf("#%d: got: %#v want: #%v", i, dst, test.out) t.Errorf("#%d: got: %#v want: #%v", i, dst, test.dec)
}
}
}
type errTest struct {
in string
err string
}
var errTests = []errTest{
{"0", "encoding/hex: odd length hex string"},
{"0g", "encoding/hex: invalid byte: U+0067 'g'"},
{"0\x01", "encoding/hex: invalid byte: U+0001"},
}
func TestInvalidErr(t *testing.T) {
for i, test := range errTests {
dst := make([]byte, DecodedLen(len(test.in)))
_, err := Decode(dst, []byte(test.in))
if err == nil {
t.Errorf("#%d: expected error; got none")
} else if err.Error() != test.err {
t.Errorf("#%d: got: %v want: %v", i, err, test.err)
}
}
}
func TestInvalidStringErr(t *testing.T) {
for i, test := range errTests {
_, err := DecodeString(test.in)
if err == nil {
t.Errorf("#%d: expected error; got none")
} else if err.Error() != test.err {
t.Errorf("#%d: got: %v want: %v", i, err, test.err)
} }
} }
} }