diff options
Diffstat (limited to 'vendor/github.com/ethereum/go-ethereum/common/hexutil/json.go')
-rw-r--r-- | vendor/github.com/ethereum/go-ethereum/common/hexutil/json.go | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/vendor/github.com/ethereum/go-ethereum/common/hexutil/json.go b/vendor/github.com/ethereum/go-ethereum/common/hexutil/json.go new file mode 100644 index 000000000..777b08eca --- /dev/null +++ b/vendor/github.com/ethereum/go-ethereum/common/hexutil/json.go @@ -0,0 +1,376 @@ +// 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" + "encoding/json" + "fmt" + "math/big" + "reflect" + "strconv" +) + +var ( + bytesT = reflect.TypeOf(Bytes(nil)) + bigT = reflect.TypeOf((*Big)(nil)) + uintT = reflect.TypeOf(Uint(0)) + uint64T = reflect.TypeOf(Uint64(0)) +) + +// Bytes marshals/unmarshals as a JSON string with 0x prefix. +// The empty slice marshals as "0x". +type Bytes []byte + +// MarshalText implements encoding.TextMarshaler +func (b Bytes) MarshalText() ([]byte, error) { + result := make([]byte, len(b)*2+2) + copy(result, `0x`) + hex.Encode(result[2:], b) + return result, nil +} + +// UnmarshalJSON implements json.Unmarshaler. +func (b *Bytes) UnmarshalJSON(input []byte) error { + if !isString(input) { + return errNonString(bytesT) + } + return wrapTypeError(b.UnmarshalText(input[1:len(input)-1]), bytesT) +} + +// UnmarshalText implements encoding.TextUnmarshaler. +func (b *Bytes) UnmarshalText(input []byte) error { + raw, err := checkText(input, true) + 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) +} + +// ImplementsGraphQLType returns true if Bytes implements the specified GraphQL type. +func (b Bytes) ImplementsGraphQLType(name string) bool { return name == "Bytes" } + +// UnmarshalGraphQL unmarshals the provided GraphQL query data. +func (b *Bytes) UnmarshalGraphQL(input interface{}) error { + var err error + switch input := input.(type) { + case string: + data, err := Decode(input) + if err != nil { + return err + } + *b = data + default: + err = fmt.Errorf("Unexpected type for Bytes: %v", input) + } + return err +} + +// UnmarshalFixedJSON decodes the input as a 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. +func UnmarshalFixedJSON(typ reflect.Type, input, out []byte) error { + if !isString(input) { + return errNonString(typ) + } + return wrapTypeError(UnmarshalFixedText(typ.String(), input[1:len(input)-1], out), typ) +} + +// UnmarshalFixedText decodes the input as a string with 0x prefix. The length of out +// determines the required input length. This function is commonly used to implement the +// UnmarshalText method for fixed-size types. +func UnmarshalFixedText(typname string, input, out []byte) error { + raw, err := checkText(input, true) + 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 +} + +// UnmarshalFixedUnprefixedText decodes the input as a string with optional 0x prefix. The +// length of out determines the required input length. This function is commonly used to +// implement the UnmarshalText method for fixed-size types. +func UnmarshalFixedUnprefixedText(typname string, input, out []byte) error { + raw, err := checkText(input, false) + 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. Values larger than 256bits are rejected by Unmarshal but will be +// marshaled without error. +type Big big.Int + +// MarshalText implements encoding.TextMarshaler +func (b Big) MarshalText() ([]byte, error) { + return []byte(EncodeBig((*big.Int)(&b))), nil +} + +// UnmarshalJSON implements json.Unmarshaler. +func (b *Big) UnmarshalJSON(input []byte) error { + if !isString(input) { + return errNonString(bigT) + } + return wrapTypeError(b.UnmarshalText(input[1:len(input)-1]), bigT) +} + +// UnmarshalText implements encoding.TextUnmarshaler +func (b *Big) UnmarshalText(input []byte) error { + raw, err := checkNumberText(input) + if err != nil { + return err + } + if len(raw) > 64 { + return ErrBig256Range + } + 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()) +} + +// ImplementsGraphQLType returns true if Big implements the provided GraphQL type. +func (b Big) ImplementsGraphQLType(name string) bool { return name == "BigInt" } + +// UnmarshalGraphQL unmarshals the provided GraphQL query data. +func (b *Big) UnmarshalGraphQL(input interface{}) error { + var err error + switch input := input.(type) { + case string: + return b.UnmarshalText([]byte(input)) + case int32: + var num big.Int + num.SetInt64(int64(input)) + *b = Big(num) + default: + err = fmt.Errorf("Unexpected type for BigInt: %v", input) + } + return err +} + +// Uint64 marshals/unmarshals as a JSON string with 0x prefix. +// The zero value marshals as "0x0". +type Uint64 uint64 + +// MarshalText implements encoding.TextMarshaler. +func (b Uint64) MarshalText() ([]byte, error) { + buf := make([]byte, 2, 10) + copy(buf, `0x`) + buf = strconv.AppendUint(buf, uint64(b), 16) + return buf, nil +} + +// UnmarshalJSON implements json.Unmarshaler. +func (b *Uint64) UnmarshalJSON(input []byte) error { + if !isString(input) { + return errNonString(uint64T) + } + return wrapTypeError(b.UnmarshalText(input[1:len(input)-1]), uint64T) +} + +// UnmarshalText implements encoding.TextUnmarshaler +func (b *Uint64) UnmarshalText(input []byte) error { + raw, err := checkNumberText(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 += nib + } + *b = Uint64(dec) + return nil +} + +// String returns the hex encoding of b. +func (b Uint64) String() string { + return EncodeUint64(uint64(b)) +} + +// ImplementsGraphQLType returns true if Uint64 implements the provided GraphQL type. +func (b Uint64) ImplementsGraphQLType(name string) bool { return name == "Long" } + +// UnmarshalGraphQL unmarshals the provided GraphQL query data. +func (b *Uint64) UnmarshalGraphQL(input interface{}) error { + var err error + switch input := input.(type) { + case string: + return b.UnmarshalText([]byte(input)) + case int32: + *b = Uint64(input) + default: + err = fmt.Errorf("Unexpected type for Long: %v", input) + } + return err +} + +// Uint marshals/unmarshals as a JSON string with 0x prefix. +// The zero value marshals as "0x0". +type Uint uint + +// MarshalText implements encoding.TextMarshaler. +func (b Uint) MarshalText() ([]byte, error) { + return Uint64(b).MarshalText() +} + +// UnmarshalJSON implements json.Unmarshaler. +func (b *Uint) UnmarshalJSON(input []byte) error { + if !isString(input) { + return errNonString(uintT) + } + return wrapTypeError(b.UnmarshalText(input[1:len(input)-1]), uintT) +} + +// UnmarshalText implements encoding.TextUnmarshaler. +func (b *Uint) UnmarshalText(input []byte) error { + var u64 Uint64 + err := u64.UnmarshalText(input) + if u64 > Uint64(^uint(0)) || err == ErrUint64Range { + return ErrUintRange + } else if err != nil { + return err + } + *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 checkText(input []byte, wantPrefix bool) ([]byte, error) { + if len(input) == 0 { + return nil, nil // empty strings are allowed + } + if bytesHave0xPrefix(input) { + input = input[2:] + } else if wantPrefix { + return nil, ErrMissingPrefix + } + if len(input)%2 != 0 { + return nil, ErrOddLength + } + return input, nil +} + +func checkNumberText(input []byte) (raw []byte, err error) { + if len(input) == 0 { + return nil, nil // empty strings are allowed + } + 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 +} + +func wrapTypeError(err error, typ reflect.Type) error { + if _, ok := err.(*decError); ok { + return &json.UnmarshalTypeError{Value: err.Error(), Type: typ} + } + return err +} + +func errNonString(typ reflect.Type) error { + return &json.UnmarshalTypeError{Value: "non-string", Type: typ} +} |