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authorFelix Lange <fjl@twurst.com>2016-09-15 08:57:48 +0800
committerFelix Lange <fjl@twurst.com>2016-11-28 18:22:52 +0800
commitec75953f509a94ccb20bd346a2413bfee1281072 (patch)
treef36c9054e7d4d785d5ebf89162f46f7bf8d5e805 /common
parent801a13f7915840c3a74e3bcfd51cc83f00f4899c (diff)
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common/hexutil: new package for 0x hex encoding
The new package is purpose-built to handle the encoding consumed and produced by the RPC API.
Diffstat (limited to 'common')
-rw-r--r--common/hexutil/hexutil.go232
-rw-r--r--common/hexutil/hexutil_test.go186
-rw-r--r--common/hexutil/json.go271
-rw-r--r--common/hexutil/json_test.go258
4 files changed, 947 insertions, 0 deletions
diff --git a/common/hexutil/hexutil.go b/common/hexutil/hexutil.go
new file mode 100644
index 000000000..29e6de333
--- /dev/null
+++ b/common/hexutil/hexutil.go
@@ -0,0 +1,232 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+/*
+Package hexutil implements hex encoding with 0x prefix.
+This encoding is used by the Ethereum RPC API to transport binary data in JSON payloads.
+
+Encoding Rules
+
+All hex data must have prefix "0x".
+
+For byte slices, the hex data must be of even length. An empty byte slice
+encodes as "0x".
+
+Integers are encoded using the least amount of digits (no leading zero digits). Their
+encoding may be of uneven length. The number zero encodes as "0x0".
+*/
+package hexutil
+
+import (
+ "encoding/hex"
+ "errors"
+ "fmt"
+ "math/big"
+ "strconv"
+)
+
+const uintBits = 32 << (uint64(^uint(0)) >> 63)
+
+var (
+ ErrEmptyString = errors.New("empty hex string")
+ ErrMissingPrefix = errors.New("missing 0x prefix for hex data")
+ ErrSyntax = errors.New("invalid hex")
+ ErrEmptyNumber = errors.New("hex number has no digits after 0x")
+ ErrLeadingZero = errors.New("hex number has leading zero digits after 0x")
+ ErrOddLength = errors.New("hex string has odd length")
+ ErrUint64Range = errors.New("hex number does not fit into 64 bits")
+ ErrUintRange = fmt.Errorf("hex number does not fit into %d bits", uintBits)
+)
+
+// Decode decodes a hex string with 0x prefix.
+func Decode(input string) ([]byte, error) {
+ if len(input) == 0 {
+ return nil, ErrEmptyString
+ }
+ if !has0xPrefix(input) {
+ return nil, ErrMissingPrefix
+ }
+ return hex.DecodeString(input[2:])
+}
+
+// MustDecode decodes a hex string with 0x prefix. It panics for invalid input.
+func MustDecode(input string) []byte {
+ dec, err := Decode(input)
+ if err != nil {
+ panic(err)
+ }
+ return dec
+}
+
+// Encode encodes b as a hex string with 0x prefix.
+func Encode(b []byte) string {
+ enc := make([]byte, len(b)*2+2)
+ copy(enc, "0x")
+ hex.Encode(enc[2:], b)
+ return string(enc)
+}
+
+// DecodeUint64 decodes a hex string with 0x prefix as a quantity.
+func DecodeUint64(input string) (uint64, error) {
+ raw, err := checkNumber(input)
+ if err != nil {
+ return 0, err
+ }
+ dec, err := strconv.ParseUint(raw, 16, 64)
+ if err != nil {
+ err = mapError(err)
+ }
+ return dec, err
+}
+
+// MustDecodeUint64 decodes a hex string with 0x prefix as a quantity.
+// It panics for invalid input.
+func MustDecodeUint64(input string) uint64 {
+ dec, err := DecodeUint64(input)
+ if err != nil {
+ panic(err)
+ }
+ return dec
+}
+
+// EncodeUint64 encodes i as a hex string with 0x prefix.
+func EncodeUint64(i uint64) string {
+ enc := make([]byte, 2, 10)
+ copy(enc, "0x")
+ return string(strconv.AppendUint(enc, i, 16))
+}
+
+var bigWordNibbles int
+
+func init() {
+ // This is a weird way to compute the number of nibbles required for big.Word.
+ // The usual way would be to use constant arithmetic but go vet can't handle that.
+ b, _ := new(big.Int).SetString("FFFFFFFFFF", 16)
+ switch len(b.Bits()) {
+ case 1:
+ bigWordNibbles = 16
+ case 2:
+ bigWordNibbles = 8
+ default:
+ panic("weird big.Word size")
+ }
+}
+
+// DecodeBig decodes a hex string with 0x prefix as a quantity.
+func DecodeBig(input string) (*big.Int, error) {
+ raw, err := checkNumber(input)
+ if err != nil {
+ return nil, err
+ }
+ words := make([]big.Word, len(raw)/bigWordNibbles+1)
+ end := len(raw)
+ for i := range words {
+ start := end - bigWordNibbles
+ if start < 0 {
+ start = 0
+ }
+ for ri := start; ri < end; ri++ {
+ nib := decodeNibble(raw[ri])
+ if nib == badNibble {
+ return nil, ErrSyntax
+ }
+ words[i] *= 16
+ words[i] += big.Word(nib)
+ }
+ end = start
+ }
+ dec := new(big.Int).SetBits(words)
+ return dec, nil
+}
+
+// MustDecodeBig decodes a hex string with 0x prefix as a quantity.
+// It panics for invalid input.
+func MustDecodeBig(input string) *big.Int {
+ dec, err := DecodeBig(input)
+ if err != nil {
+ panic(err)
+ }
+ return dec
+}
+
+// EncodeBig encodes bigint as a hex string with 0x prefix.
+// The sign of the integer is ignored.
+func EncodeBig(bigint *big.Int) string {
+ nbits := bigint.BitLen()
+ if nbits == 0 {
+ return "0x0"
+ }
+ enc := make([]byte, 2, (nbits/8)*2+2)
+ copy(enc, "0x")
+ for i := len(bigint.Bits()) - 1; i >= 0; i-- {
+ enc = strconv.AppendUint(enc, uint64(bigint.Bits()[i]), 16)
+ }
+ return string(enc)
+}
+
+func has0xPrefix(input string) bool {
+ return len(input) >= 2 && input[0] == '0' && (input[1] == 'x' || input[1] == 'X')
+}
+
+func checkNumber(input string) (raw string, err error) {
+ if len(input) == 0 {
+ return "", ErrEmptyString
+ }
+ if !has0xPrefix(input) {
+ return "", ErrMissingPrefix
+ }
+ input = input[2:]
+ if len(input) == 0 {
+ return "", ErrEmptyNumber
+ }
+ if len(input) > 1 && input[0] == '0' {
+ return "", ErrLeadingZero
+ }
+ return input, nil
+}
+
+const badNibble = ^uint64(0)
+
+func decodeNibble(in byte) uint64 {
+ switch {
+ case in >= '0' && in <= '9':
+ return uint64(in - '0')
+ case in >= 'A' && in <= 'F':
+ return uint64(in - 'A' + 10)
+ case in >= 'a' && in <= 'f':
+ return uint64(in - 'a' + 10)
+ default:
+ return badNibble
+ }
+}
+
+func mapError(err error) error {
+ if err, ok := err.(*strconv.NumError); ok {
+ switch err.Err {
+ case strconv.ErrRange:
+ return ErrUint64Range
+ case strconv.ErrSyntax:
+ return ErrSyntax
+ }
+ }
+ if _, ok := err.(hex.InvalidByteError); ok {
+ return ErrSyntax
+ }
+ if err == hex.ErrLength {
+ return ErrOddLength
+ }
+ return err
+}
diff --git a/common/hexutil/hexutil_test.go b/common/hexutil/hexutil_test.go
new file mode 100644
index 000000000..3f261c9a7
--- /dev/null
+++ b/common/hexutil/hexutil_test.go
@@ -0,0 +1,186 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package hexutil
+
+import (
+ "bytes"
+ "encoding/hex"
+ "math/big"
+ "testing"
+)
+
+type marshalTest struct {
+ input interface{}
+ want string
+}
+
+type unmarshalTest struct {
+ input string
+ want interface{}
+ wantErr error
+}
+
+var (
+ encodeBytesTests = []marshalTest{
+ {[]byte{}, "0x"},
+ {[]byte{0}, "0x00"},
+ {[]byte{0, 0, 1, 2}, "0x00000102"},
+ }
+
+ encodeBigTests = []marshalTest{
+ {referenceBig("0"), "0x0"},
+ {referenceBig("1"), "0x1"},
+ {referenceBig("ff"), "0xff"},
+ {referenceBig("112233445566778899aabbccddeeff"), "0x112233445566778899aabbccddeeff"},
+ }
+
+ encodeUint64Tests = []marshalTest{
+ {uint64(0), "0x0"},
+ {uint64(1), "0x1"},
+ {uint64(0xff), "0xff"},
+ {uint64(0x1122334455667788), "0x1122334455667788"},
+ }
+
+ decodeBytesTests = []unmarshalTest{
+ // invalid
+ {input: ``, wantErr: ErrEmptyString},
+ {input: `0`, wantErr: ErrMissingPrefix},
+ {input: `0x0`, wantErr: hex.ErrLength},
+ {input: `0x023`, wantErr: hex.ErrLength},
+ {input: `0xxx`, wantErr: hex.InvalidByteError('x')},
+ {input: `0x01zz01`, wantErr: hex.InvalidByteError('z')},
+ // valid
+ {input: `0x`, want: []byte{}},
+ {input: `0X`, want: []byte{}},
+ {input: `0x02`, want: []byte{0x02}},
+ {input: `0X02`, want: []byte{0x02}},
+ {input: `0xffffffffff`, want: []byte{0xff, 0xff, 0xff, 0xff, 0xff}},
+ {
+ input: `0xffffffffffffffffffffffffffffffffffff`,
+ want: []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
+ },
+ }
+
+ decodeBigTests = []unmarshalTest{
+ // invalid
+ {input: `0`, wantErr: ErrMissingPrefix},
+ {input: `0x`, wantErr: ErrEmptyNumber},
+ {input: `0x01`, wantErr: ErrLeadingZero},
+ {input: `0xx`, wantErr: ErrSyntax},
+ {input: `0x1zz01`, wantErr: ErrSyntax},
+ // valid
+ {input: `0x0`, want: big.NewInt(0)},
+ {input: `0x2`, want: big.NewInt(0x2)},
+ {input: `0x2F2`, want: big.NewInt(0x2f2)},
+ {input: `0X2F2`, want: big.NewInt(0x2f2)},
+ {input: `0x1122aaff`, want: big.NewInt(0x1122aaff)},
+ {input: `0xbBb`, want: big.NewInt(0xbbb)},
+ {input: `0xfffffffff`, want: big.NewInt(0xfffffffff)},
+ {
+ input: `0x112233445566778899aabbccddeeff`,
+ want: referenceBig("112233445566778899aabbccddeeff"),
+ },
+ {
+ input: `0xffffffffffffffffffffffffffffffffffff`,
+ want: referenceBig("ffffffffffffffffffffffffffffffffffff"),
+ },
+ }
+
+ decodeUint64Tests = []unmarshalTest{
+ // invalid
+ {input: `0`, wantErr: ErrMissingPrefix},
+ {input: `0x`, wantErr: ErrEmptyNumber},
+ {input: `0x01`, wantErr: ErrLeadingZero},
+ {input: `0xfffffffffffffffff`, wantErr: ErrUintRange},
+ {input: `0xx`, wantErr: ErrSyntax},
+ {input: `0x1zz01`, wantErr: ErrSyntax},
+ // valid
+ {input: `0x0`, want: uint64(0)},
+ {input: `0x2`, want: uint64(0x2)},
+ {input: `0x2F2`, want: uint64(0x2f2)},
+ {input: `0X2F2`, want: uint64(0x2f2)},
+ {input: `0x1122aaff`, want: uint64(0x1122aaff)},
+ {input: `0xbbb`, want: uint64(0xbbb)},
+ {input: `0xffffffffffffffff`, want: uint64(0xffffffffffffffff)},
+ }
+)
+
+func TestEncode(t *testing.T) {
+ for _, test := range encodeBytesTests {
+ enc := Encode(test.input.([]byte))
+ if enc != test.want {
+ t.Errorf("input %x: wrong encoding %s", test.input, enc)
+ }
+ }
+}
+
+func TestDecode(t *testing.T) {
+ for _, test := range decodeBytesTests {
+ dec, err := Decode(test.input)
+ if !checkError(t, test.input, err, test.wantErr) {
+ continue
+ }
+ if !bytes.Equal(test.want.([]byte), dec) {
+ t.Errorf("input %s: value mismatch: got %x, want %x", test.input, dec, test.want)
+ continue
+ }
+ }
+}
+
+func TestEncodeBig(t *testing.T) {
+ for _, test := range encodeBigTests {
+ enc := EncodeBig(test.input.(*big.Int))
+ if enc != test.want {
+ t.Errorf("input %x: wrong encoding %s", test.input, enc)
+ }
+ }
+}
+
+func TestDecodeBig(t *testing.T) {
+ for _, test := range decodeBigTests {
+ dec, err := DecodeBig(test.input)
+ if !checkError(t, test.input, err, test.wantErr) {
+ continue
+ }
+ if dec.Cmp(test.want.(*big.Int)) != 0 {
+ t.Errorf("input %s: value mismatch: got %x, want %x", test.input, dec, test.want)
+ continue
+ }
+ }
+}
+
+func TestEncodeUint64(t *testing.T) {
+ for _, test := range encodeUint64Tests {
+ enc := EncodeUint64(test.input.(uint64))
+ if enc != test.want {
+ t.Errorf("input %x: wrong encoding %s", test.input, enc)
+ }
+ }
+}
+
+func TestDecodeUint64(t *testing.T) {
+ for _, test := range decodeUint64Tests {
+ dec, err := DecodeUint64(test.input)
+ if !checkError(t, test.input, err, test.wantErr) {
+ continue
+ }
+ if dec != test.want.(uint64) {
+ t.Errorf("input %s: value mismatch: got %x, want %x", test.input, dec, test.want)
+ continue
+ }
+ }
+}
diff --git a/common/hexutil/json.go b/common/hexutil/json.go
new file mode 100644
index 000000000..cbbadbed6
--- /dev/null
+++ b/common/hexutil/json.go
@@ -0,0 +1,271 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package hexutil
+
+import (
+ "encoding/hex"
+ "errors"
+ "fmt"
+ "math/big"
+ "strconv"
+)
+
+var (
+ jsonNull = []byte("null")
+ jsonZero = []byte(`"0x0"`)
+ errNonString = errors.New("cannot unmarshal non-string as hex data")
+ errNegativeBigInt = errors.New("hexutil.Big: can't marshal negative integer")
+)
+
+// Bytes marshals/unmarshals as a JSON string with 0x prefix.
+// The empty slice marshals as "0x".
+type Bytes []byte
+
+// MarshalJSON implements json.Marshaler.
+func (b Bytes) MarshalJSON() ([]byte, error) {
+ result := make([]byte, len(b)*2+4)
+ copy(result, `"0x`)
+ hex.Encode(result[3:], b)
+ result[len(result)-1] = '"'
+ return result, nil
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (b *Bytes) UnmarshalJSON(input []byte) error {
+ raw, err := checkJSON(input)
+ if err != nil {
+ return err
+ }
+ dec := make([]byte, len(raw)/2)
+ if _, err = hex.Decode(dec, raw); err != nil {
+ err = mapError(err)
+ } else {
+ *b = dec
+ }
+ return err
+}
+
+// String returns the hex encoding of b.
+func (b Bytes) String() string {
+ return Encode(b)
+}
+
+// UnmarshalJSON decodes input as a JSON string with 0x prefix. The length of out
+// determines the required input length. This function is commonly used to implement the
+// UnmarshalJSON method for fixed-size types:
+//
+// type Foo [8]byte
+//
+// func (f *Foo) UnmarshalJSON(input []byte) error {
+// return hexutil.UnmarshalJSON("Foo", input, f[:])
+// }
+func UnmarshalJSON(typname string, input, out []byte) error {
+ raw, err := checkJSON(input)
+ if err != nil {
+ return err
+ }
+ if len(raw)/2 != len(out) {
+ return fmt.Errorf("hex string has length %d, want %d for %s", len(raw), len(out)*2, typname)
+ }
+ // Pre-verify syntax before modifying out.
+ for _, b := range raw {
+ if decodeNibble(b) == badNibble {
+ return ErrSyntax
+ }
+ }
+ hex.Decode(out, raw)
+ return nil
+}
+
+// Big marshals/unmarshals as a JSON string with 0x prefix. The zero value marshals as
+// "0x0". Negative integers are not supported at this time. Attempting to marshal them
+// will return an error.
+type Big big.Int
+
+// MarshalJSON implements json.Marshaler.
+func (b *Big) MarshalJSON() ([]byte, error) {
+ if b == nil {
+ return jsonNull, nil
+ }
+ bigint := (*big.Int)(b)
+ if bigint.Sign() == -1 {
+ return nil, errNegativeBigInt
+ }
+ nbits := bigint.BitLen()
+ if nbits == 0 {
+ return jsonZero, nil
+ }
+ enc := make([]byte, 3, (nbits/8)*2+4)
+ copy(enc, `"0x`)
+ for i := len(bigint.Bits()) - 1; i >= 0; i-- {
+ enc = strconv.AppendUint(enc, uint64(bigint.Bits()[i]), 16)
+ }
+ enc = append(enc, '"')
+ return enc, nil
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (b *Big) UnmarshalJSON(input []byte) error {
+ raw, err := checkNumberJSON(input)
+ if err != nil {
+ return err
+ }
+ words := make([]big.Word, len(raw)/bigWordNibbles+1)
+ end := len(raw)
+ for i := range words {
+ start := end - bigWordNibbles
+ if start < 0 {
+ start = 0
+ }
+ for ri := start; ri < end; ri++ {
+ nib := decodeNibble(raw[ri])
+ if nib == badNibble {
+ return ErrSyntax
+ }
+ words[i] *= 16
+ words[i] += big.Word(nib)
+ }
+ end = start
+ }
+ var dec big.Int
+ dec.SetBits(words)
+ *b = (Big)(dec)
+ return nil
+}
+
+// ToInt converts b to a big.Int.
+func (b *Big) ToInt() *big.Int {
+ return (*big.Int)(b)
+}
+
+// String returns the hex encoding of b.
+func (b *Big) String() string {
+ return EncodeBig(b.ToInt())
+}
+
+// Uint64 marshals/unmarshals as a JSON string with 0x prefix.
+// The zero value marshals as "0x0".
+type Uint64 uint64
+
+// MarshalJSON implements json.Marshaler.
+func (b Uint64) MarshalJSON() ([]byte, error) {
+ buf := make([]byte, 3, 12)
+ copy(buf, `"0x`)
+ buf = strconv.AppendUint(buf, uint64(b), 16)
+ buf = append(buf, '"')
+ return buf, nil
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (b *Uint64) UnmarshalJSON(input []byte) error {
+ raw, err := checkNumberJSON(input)
+ if err != nil {
+ return err
+ }
+ if len(raw) > 16 {
+ return ErrUint64Range
+ }
+ var dec uint64
+ for _, byte := range raw {
+ nib := decodeNibble(byte)
+ if nib == badNibble {
+ return ErrSyntax
+ }
+ dec *= 16
+ dec += uint64(nib)
+ }
+ *b = Uint64(dec)
+ return nil
+}
+
+// String returns the hex encoding of b.
+func (b Uint64) String() string {
+ return EncodeUint64(uint64(b))
+}
+
+// Uint marshals/unmarshals as a JSON string with 0x prefix.
+// The zero value marshals as "0x0".
+type Uint uint
+
+// MarshalJSON implements json.Marshaler.
+func (b Uint) MarshalJSON() ([]byte, error) {
+ return Uint64(b).MarshalJSON()
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (b *Uint) UnmarshalJSON(input []byte) error {
+ var u64 Uint64
+ err := u64.UnmarshalJSON(input)
+ if err != nil {
+ return err
+ } else if u64 > Uint64(^uint(0)) {
+ return ErrUintRange
+ }
+ *b = Uint(u64)
+ return nil
+}
+
+// String returns the hex encoding of b.
+func (b Uint) String() string {
+ return EncodeUint64(uint64(b))
+}
+
+func isString(input []byte) bool {
+ return len(input) >= 2 && input[0] == '"' && input[len(input)-1] == '"'
+}
+
+func bytesHave0xPrefix(input []byte) bool {
+ return len(input) >= 2 && input[0] == '0' && (input[1] == 'x' || input[1] == 'X')
+}
+
+func checkJSON(input []byte) (raw []byte, err error) {
+ if !isString(input) {
+ return nil, errNonString
+ }
+ if len(input) == 2 {
+ return nil, ErrEmptyString
+ }
+ if !bytesHave0xPrefix(input[1:]) {
+ return nil, ErrMissingPrefix
+ }
+ input = input[3 : len(input)-1]
+ if len(input)%2 != 0 {
+ return nil, ErrOddLength
+ }
+ return input, nil
+}
+
+func checkNumberJSON(input []byte) (raw []byte, err error) {
+ if !isString(input) {
+ return nil, errNonString
+ }
+ input = input[1 : len(input)-1]
+ if len(input) == 0 {
+ return nil, ErrEmptyString
+ }
+ if !bytesHave0xPrefix(input) {
+ return nil, ErrMissingPrefix
+ }
+ input = input[2:]
+ if len(input) == 0 {
+ return nil, ErrEmptyNumber
+ }
+ if len(input) > 1 && input[0] == '0' {
+ return nil, ErrLeadingZero
+ }
+ return input, nil
+}
diff --git a/common/hexutil/json_test.go b/common/hexutil/json_test.go
new file mode 100644
index 000000000..16f1b9aa7
--- /dev/null
+++ b/common/hexutil/json_test.go
@@ -0,0 +1,258 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package hexutil
+
+import (
+ "bytes"
+ "encoding/hex"
+ "math/big"
+ "testing"
+)
+
+func checkError(t *testing.T, input string, got, want error) bool {
+ if got == nil {
+ if want != nil {
+ t.Errorf("input %s: got no error, want %q", input, want)
+ return false
+ }
+ return true
+ }
+ if want == nil {
+ t.Errorf("input %s: unexpected error %q", input, got)
+ } else if got.Error() != want.Error() {
+ t.Errorf("input %s: got error %q, want %q", input, got, want)
+ }
+ return false
+}
+
+func referenceBig(s string) *big.Int {
+ b, ok := new(big.Int).SetString(s, 16)
+ if !ok {
+ panic("invalid")
+ }
+ return b
+}
+
+func referenceBytes(s string) []byte {
+ b, err := hex.DecodeString(s)
+ if err != nil {
+ panic(err)
+ }
+ return b
+}
+
+var unmarshalBytesTests = []unmarshalTest{
+ // invalid encoding
+ {input: "", wantErr: errNonString},
+ {input: "null", wantErr: errNonString},
+ {input: "10", wantErr: errNonString},
+ {input: `""`, wantErr: ErrEmptyString},
+ {input: `"0"`, wantErr: ErrMissingPrefix},
+ {input: `"0x0"`, wantErr: ErrOddLength},
+ {input: `"0xxx"`, wantErr: ErrSyntax},
+ {input: `"0x01zz01"`, wantErr: ErrSyntax},
+
+ // valid encoding
+ {input: `"0x"`, want: referenceBytes("")},
+ {input: `"0x02"`, want: referenceBytes("02")},
+ {input: `"0X02"`, want: referenceBytes("02")},
+ {input: `"0xffffffffff"`, want: referenceBytes("ffffffffff")},
+ {
+ input: `"0xffffffffffffffffffffffffffffffffffff"`,
+ want: referenceBytes("ffffffffffffffffffffffffffffffffffff"),
+ },
+}
+
+func TestUnmarshalBytes(t *testing.T) {
+ for _, test := range unmarshalBytesTests {
+ var v Bytes
+ err := v.UnmarshalJSON([]byte(test.input))
+ if !checkError(t, test.input, err, test.wantErr) {
+ continue
+ }
+ if !bytes.Equal(test.want.([]byte), []byte(v)) {
+ t.Errorf("input %s: value mismatch: got %x, want %x", test.input, &v, test.want)
+ continue
+ }
+ }
+}
+
+func BenchmarkUnmarshalBytes(b *testing.B) {
+ input := []byte(`"0x123456789abcdef123456789abcdef"`)
+ for i := 0; i < b.N; i++ {
+ var v Bytes
+ if err := v.UnmarshalJSON(input); err != nil {
+ b.Fatal(err)
+ }
+ }
+}
+
+func TestMarshalBytes(t *testing.T) {
+ for _, test := range encodeBytesTests {
+ in := test.input.([]byte)
+ out, err := Bytes(in).MarshalJSON()
+ if err != nil {
+ t.Errorf("%x: %v", in, err)
+ continue
+ }
+ if want := `"` + test.want + `"`; string(out) != want {
+ t.Errorf("%x: MarshalJSON output mismatch: got %q, want %q", in, out, want)
+ continue
+ }
+ if out := Bytes(in).String(); out != test.want {
+ t.Errorf("%x: String mismatch: got %q, want %q", in, out, test.want)
+ continue
+ }
+ }
+}
+
+var unmarshalBigTests = []unmarshalTest{
+ // invalid encoding
+ {input: "", wantErr: errNonString},
+ {input: "null", wantErr: errNonString},
+ {input: "10", wantErr: errNonString},
+ {input: `""`, wantErr: ErrEmptyString},
+ {input: `"0"`, wantErr: ErrMissingPrefix},
+ {input: `"0x"`, wantErr: ErrEmptyNumber},
+ {input: `"0x01"`, wantErr: ErrLeadingZero},
+ {input: `"0xx"`, wantErr: ErrSyntax},
+ {input: `"0x1zz01"`, wantErr: ErrSyntax},
+
+ // valid encoding
+ {input: `"0x0"`, want: big.NewInt(0)},
+ {input: `"0x2"`, want: big.NewInt(0x2)},
+ {input: `"0x2F2"`, want: big.NewInt(0x2f2)},
+ {input: `"0X2F2"`, want: big.NewInt(0x2f2)},
+ {input: `"0x1122aaff"`, want: big.NewInt(0x1122aaff)},
+ {input: `"0xbBb"`, want: big.NewInt(0xbbb)},
+ {input: `"0xfffffffff"`, want: big.NewInt(0xfffffffff)},
+ {
+ input: `"0x112233445566778899aabbccddeeff"`,
+ want: referenceBig("112233445566778899aabbccddeeff"),
+ },
+ {
+ input: `"0xffffffffffffffffffffffffffffffffffff"`,
+ want: referenceBig("ffffffffffffffffffffffffffffffffffff"),
+ },
+}
+
+func TestUnmarshalBig(t *testing.T) {
+ for _, test := range unmarshalBigTests {
+ var v Big
+ err := v.UnmarshalJSON([]byte(test.input))
+ if !checkError(t, test.input, err, test.wantErr) {
+ continue
+ }
+ if test.want != nil && test.want.(*big.Int).Cmp((*big.Int)(&v)) != 0 {
+ t.Errorf("input %s: value mismatch: got %x, want %x", test.input, (*big.Int)(&v), test.want)
+ continue
+ }
+ }
+}
+
+func BenchmarkUnmarshalBig(b *testing.B) {
+ input := []byte(`"0x123456789abcdef123456789abcdef"`)
+ for i := 0; i < b.N; i++ {
+ var v Big
+ if err := v.UnmarshalJSON(input); err != nil {
+ b.Fatal(err)
+ }
+ }
+}
+
+func TestMarshalBig(t *testing.T) {
+ for _, test := range encodeBigTests {
+ in := test.input.(*big.Int)
+ out, err := (*Big)(in).MarshalJSON()
+ if err != nil {
+ t.Errorf("%d: %v", in, err)
+ continue
+ }
+ if want := `"` + test.want + `"`; string(out) != want {
+ t.Errorf("%d: MarshalJSON output mismatch: got %q, want %q", in, out, want)
+ continue
+ }
+ if out := (*Big)(in).String(); out != test.want {
+ t.Errorf("%x: String mismatch: got %q, want %q", in, out, test.want)
+ continue
+ }
+ }
+}
+
+var unmarshalUint64Tests = []unmarshalTest{
+ // invalid encoding
+ {input: "", wantErr: errNonString},
+ {input: "null", wantErr: errNonString},
+ {input: "10", wantErr: errNonString},
+ {input: `""`, wantErr: ErrEmptyString},
+ {input: `"0"`, wantErr: ErrMissingPrefix},
+ {input: `"0x"`, wantErr: ErrEmptyNumber},
+ {input: `"0x01"`, wantErr: ErrLeadingZero},
+ {input: `"0xfffffffffffffffff"`, wantErr: ErrUintRange},
+ {input: `"0xx"`, wantErr: ErrSyntax},
+ {input: `"0x1zz01"`, wantErr: ErrSyntax},
+
+ // valid encoding
+ {input: `"0x0"`, want: uint64(0)},
+ {input: `"0x2"`, want: uint64(0x2)},
+ {input: `"0x2F2"`, want: uint64(0x2f2)},
+ {input: `"0X2F2"`, want: uint64(0x2f2)},
+ {input: `"0x1122aaff"`, want: uint64(0x1122aaff)},
+ {input: `"0xbbb"`, want: uint64(0xbbb)},
+ {input: `"0xffffffffffffffff"`, want: uint64(0xffffffffffffffff)},
+}
+
+func TestUnmarshalUint64(t *testing.T) {
+ for _, test := range unmarshalUint64Tests {
+ var v Uint64
+ err := v.UnmarshalJSON([]byte(test.input))
+ if !checkError(t, test.input, err, test.wantErr) {
+ continue
+ }
+ if uint64(v) != test.want.(uint64) {
+ t.Errorf("input %s: value mismatch: got %d, want %d", test.input, v, test.want)
+ continue
+ }
+ }
+}
+
+func BenchmarkUnmarshalUint64(b *testing.B) {
+ input := []byte(`"0x123456789abcdf"`)
+ for i := 0; i < b.N; i++ {
+ var v Uint64
+ v.UnmarshalJSON(input)
+ }
+}
+
+func TestMarshalUint64(t *testing.T) {
+ for _, test := range encodeUint64Tests {
+ in := test.input.(uint64)
+ out, err := Uint64(in).MarshalJSON()
+ if err != nil {
+ t.Errorf("%d: %v", in, err)
+ continue
+ }
+ if want := `"` + test.want + `"`; string(out) != want {
+ t.Errorf("%d: MarshalJSON output mismatch: got %q, want %q", in, out, want)
+ continue
+ }
+ if out := (Uint64)(in).String(); out != test.want {
+ t.Errorf("%x: String mismatch: got %q, want %q", in, out, test.want)
+ continue
+ }
+ }
+}