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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gob
import (
// Integers encode as a variant of Google's protocol buffer varint (varvarint?).
// The variant is that the continuation bytes have a zero top bit instead of a one.
// That way there's only one bit to clear and the value is a little easier to see if
// you're the unfortunate sort of person who must read the hex to debug.
// EncodeUint writes an encoded unsigned integer to w.
func EncodeUint(w io.Writer, x uint64) os.Error {
var buf [16]byte;
var n int;
for n = 0; x > 127; n++ {
buf[n] = uint8(x & 0x7F);
x >>= 7;
buf[n] = 0x80 | uint8(x);
nn, err := w.Write(buf[0:n+1]);
return err;
// EncodeInt writes an encoded signed integer to w.
// The low bit of the encoding says whether to bit complement the (other bits of the) uint to recover the int.
func EncodeInt(w io.Writer, i int64) os.Error {
var x uint64;
if i < 0 {
x = uint64(^i << 1) | 1
} else {
x = uint64(i << 1)
return EncodeUint(w, uint64(x))