/
util.go
98 lines (88 loc) · 2.79 KB
/
util.go
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// Copyright (c) 2016, Alan Chen
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package common
import (
"bytes"
"encoding/gob"
"regexp"
"strconv"
"strings"
)
func IsHex(hex string) bool {
hexMatcher := regexp.MustCompile("0[xX][0-9a-fA-F]+")
return hexMatcher.MatchString(hex)
}
func HexToString(hex string) string {
if strings.Index(hex, "0x") == 0 || strings.Index(hex, "0X") == 0 {
return hex[2:]
}
return hex
}
func BytesToHex(data []byte) string {
buffer := new(bytes.Buffer)
for _, b := range data {
s := strconv.FormatInt(int64(b&0xFF), 16)
if len(s) == 1 {
buffer.WriteString("0")
}
buffer.WriteString(s)
}
return "0x" + buffer.String()
}
func HexToBytes(hex string) []byte {
hex = HexToString(hex)
length := len(hex) / 2
slice := make([]byte, length)
rs := []rune(hex)
for i := 0; i < length; i++ {
s := string(rs[i*2 : i*2+2])
value, _ := strconv.ParseInt(s, 16, 10)
slice[i] = byte(value & 0xFF)
}
return slice
}
func StringToAddress(s string) (addr Address) {
b := HexToBytes(s)
copy(addr[:], b)
return addr
}
func StringToHash(s string) (hash Hash) {
b := HexToBytes(s)
copy(hash[:], b)
return hash
}
func ToBytes(data interface{}) ([]byte, error) {
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
err := enc.Encode(data)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}