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