60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
package main
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import (
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"math"
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"bytes"
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)
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func ToBinary(x int, bytes int) string {
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if bytes == 0 {
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return ""
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} else {
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return ToBinary(int(x / 256), bytes - 1) + string(x % 256)
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}
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}
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func NumToVarInt(x int) string {
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if x < 253 {
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return string(x)
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} else if x < int(math.Pow(2,16)) {
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return string(253) + ToBinary(x, 2)
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} else if x < int(math.Pow(2,32)) {
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return string(253) + ToBinary(x, 4)
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} else {
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return string(253) + ToBinary(x, 8)
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}
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}
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func RlpEncode(object interface{}) string {
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if str, ok := object.(string); ok {
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return "\x00" + NumToVarInt(len(str)) + str
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} else if slice, ok := object.([]interface{}); ok {
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var buffer bytes.Buffer
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for _, val := range slice {
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if v, ok := val.(string); ok {
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buffer.WriteString(RlpEncode(v))
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} else {
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buffer.WriteString(RlpEncode(val))
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}
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}
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return "\x01" + RlpEncode(len(buffer.String())) + buffer.String()
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} else if slice, ok := object.([]string); ok {
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// FIXME this isn't dry. Fix this
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var buffer bytes.Buffer
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for _, val := range slice {
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buffer.WriteString(RlpEncode(val))
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}
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return "\x01" + RlpEncode(len(buffer.String())) + buffer.String()
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}
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return ""
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}
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type RlpSerializer interface {
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MarshalRls() []byte
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UnmarshalRls([]byte)
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}
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