1 files changed, 234 insertions, 0 deletions
diff --git a/common/bytes.go b/common/bytes.go
new file mode 100644
index 000000000..4aef9a223
--- /dev/null
+++ b/common/bytes.go
@@ -0,0 +1,234 @@
+package common
+
+import (
+	"bytes"
+	"encoding/binary"
+	"encoding/hex"
+	"fmt"
+	"math/big"
+	"strings"
+)
+
+type Bytes []byte
+
+func (self Bytes) String() string {
+	return string(self)
+}
+
+func DeleteFromByteSlice(s [][]byte, hash []byte) [][]byte {
+	for i, h := range s {
+		if bytes.Compare(h, hash) == 0 {
+			return append(s[:i:i], s[i+1:]...)
+		}
+	}
+
+	return s
+}
+
+// Number to bytes
+//
+// Returns the number in bytes with the specified base
+func NumberToBytes(num interface{}, bits int) []byte {
+	buf := new(bytes.Buffer)
+	err := binary.Write(buf, binary.BigEndian, num)
+	if err != nil {
+		fmt.Println("NumberToBytes failed:", err)
+	}
+
+	return buf.Bytes()[buf.Len()-(bits/8):]
+}
+
+// Bytes to number
+//
+// Attempts to cast a byte slice to a unsigned integer
+func BytesToNumber(b []byte) uint64 {
+	var number uint64
+
+	// Make sure the buffer is 64bits
+	data := make([]byte, 8)
+	data = append(data[:len(b)], b...)
+
+	buf := bytes.NewReader(data)
+	err := binary.Read(buf, binary.BigEndian, &number)
+	if err != nil {
+		fmt.Println("BytesToNumber failed:", err)
+	}
+
+	return number
+}
+
+// Read variable int
+//
+// Read a variable length number in big endian byte order
+func ReadVarInt(buff []byte) (ret uint64) {
+	switch l := len(buff); {
+	case l > 4:
+		d := LeftPadBytes(buff, 8)
+		binary.Read(bytes.NewReader(d), binary.BigEndian, &ret)
+	case l > 2:
+		var num uint32
+		d := LeftPadBytes(buff, 4)
+		binary.Read(bytes.NewReader(d), binary.BigEndian, &num)
+		ret = uint64(num)
+	case l > 1:
+		var num uint16
+		d := LeftPadBytes(buff, 2)
+		binary.Read(bytes.NewReader(d), binary.BigEndian, &num)
+		ret = uint64(num)
+	default:
+		var num uint8
+		binary.Read(bytes.NewReader(buff), binary.BigEndian, &num)
+		ret = uint64(num)
+	}
+
+	return
+}
+
+// Binary length
+//
+// Returns the true binary length of the given number
+func BinaryLength(num int) int {
+	if num == 0 {
+		return 0
+	}
+
+	return 1 + BinaryLength(num>>8)
+}
+
+// Copy bytes
+//
+// Returns an exact copy of the provided bytes
+func CopyBytes(b []byte) (copiedBytes []byte) {
+	copiedBytes = make([]byte, len(b))
+	copy(copiedBytes, b)
+
+	return
+}
+
+func IsHex(str string) bool {
+	l := len(str)
+	return l >= 4 && l%2 == 0 && str[0:2] == "0x"
+}
+
+func Bytes2Hex(d []byte) string {
+	return hex.EncodeToString(d)
+}
+
+func Hex2Bytes(str string) []byte {
+	h, _ := hex.DecodeString(str)
+
+	return h
+}
+
+func StringToByteFunc(str string, cb func(str string) []byte) (ret []byte) {
+	if len(str) > 1 && str[0:2] == "0x" && !strings.Contains(str, "\n") {
+		ret = Hex2Bytes(str[2:])
+	} else {
+		ret = cb(str)
+	}
+
+	return
+}
+
+func FormatData(data string) []byte {
+	if len(data) == 0 {
+		return nil
+	}
+	// Simple stupid
+	d := new(big.Int)
+	if data[0:1] == "\"" && data[len(data)-1:] == "\"" {
+		return RightPadBytes([]byte(data[1:len(data)-1]), 32)
+	} else if len(data) > 1 && data[:2] == "0x" {
+		d.SetBytes(Hex2Bytes(data[2:]))
+	} else {
+		d.SetString(data, 0)
+	}
+
+	return BigToBytes(d, 256)
+}
+
+func ParseData(data ...interface{}) (ret []byte) {
+	for _, item := range data {
+		switch t := item.(type) {
+		case string:
+			var str []byte
+			if IsHex(t) {
+				str = Hex2Bytes(t[2:])
+			} else {
+				str = []byte(t)
+			}
+
+			ret = append(ret, RightPadBytes(str, 32)...)
+		case []byte:
+			ret = append(ret, LeftPadBytes(t, 32)...)
+		}
+	}
+
+	return
+}
+
+func RightPadBytes(slice []byte, l int) []byte {
+	if l < len(slice) {
+		return slice
+	}
+
+	padded := make([]byte, l)
+	copy(padded[0:len(slice)], slice)
+
+	return padded
+}
+
+func LeftPadBytes(slice []byte, l int) []byte {
+	if l < len(slice) {
+		return slice
+	}
+
+	padded := make([]byte, l)
+	copy(padded[l-len(slice):], slice)
+
+	return padded
+}
+
+func LeftPadString(str string, l int) string {
+	if l < len(str) {
+		return str
+	}
+
+	zeros := Bytes2Hex(make([]byte, (l-len(str))/2))
+
+	return zeros + str
+
+}
+
+func RightPadString(str string, l int) string {
+	if l < len(str) {
+		return str
+	}
+
+	zeros := Bytes2Hex(make([]byte, (l-len(str))/2))
+
+	return str + zeros
+
+}
+
+func Address(slice []byte) (addr []byte) {
+	if len(slice) < 20 {
+		addr = LeftPadBytes(slice, 20)
+	} else if len(slice) > 20 {
+		addr = slice[len(slice)-20:]
+	} else {
+		addr = slice
+	}
+
+	addr = CopyBytes(addr)
+
+	return
+}
+
+func ByteSliceToInterface(slice [][]byte) (ret []interface{}) {
+	for _, i := range slice {
+		ret = append(ret, i)
+	}
+
+	return
+}