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trie: run codec tests, add benchmarks, faster

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This commit is contained in:
Ethan Buchman
2015-08-06 12:39:07 -04:00
parent 7baa5977c8
commit 46c9594081
2 changed files with 70 additions and 24 deletions
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36
trie/encoding.go
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@ -16,10 +16,6 @@
package trie
import (
"bytes"
)
func CompactEncode(hexSlice []byte) []byte {
terminator := 0
if hexSlice[len(hexSlice)-1] == 16 {
@ -38,12 +34,12 @@ func CompactEncode(hexSlice []byte) []byte {
hexSlice = append([]byte{flags, 0}, hexSlice...)
}
var buff bytes.Buffer
for i := 0; i < len(hexSlice); i += 2 {
buff.WriteByte(byte(16*hexSlice[i] + hexSlice[i+1]))
l := len(hexSlice) / 2
var buf = make([]byte, l)
for i := 0; i < l; i++ {
buf[i] = 16*hexSlice[2*i] + hexSlice[2*i+1]
}
return buff.Bytes()
return buf
}
func CompactDecode(str []byte) []byte {
@ -62,22 +58,22 @@ func CompactDecode(str []byte) []byte {
}
func CompactHexDecode(str []byte) []byte {
var nibbles []byte
for _, b := range str {
nibbles = append(nibbles, b/16)
nibbles = append(nibbles, b%16)
l := len(str)*2 + 1
var nibbles = make([]byte, l)
for i, b := range str {
nibbles[i*2] = b / 16
nibbles[i*2+1] = b % 16
}
nibbles = append(nibbles, 16)
nibbles[l-1] = 16
return nibbles
}
// assumes key is odd length
func DecodeCompact(key []byte) []byte {
var res []byte
for i := 0; i < len(key)-1; i += 2 {
v1, v0 := key[i], key[i+1]
res = append(res, v1*16+v0)
l := len(key) / 2
var res = make([]byte, l)
for i := 0; i < l; i++ {
v1, v0 := key[2*i], key[2*i+1]
res[i] = v1*16 + v0
}
return res
}