// run | |
// Copyright 2010 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. | |
// Issue 1011. Removing either #1 or #3 avoided the crash at #2. | |
package main | |
import ( | |
"io" | |
"strings" | |
) | |
func readU16BE(b []byte) uint16 { | |
b[0] = 0 | |
b[1] = 1 | |
return uint16(b[0])<<8 + uint16(b[1]) // #1 | |
n := uint16(b[0])<<8 + uint16(b[1]) | |
return n | |
} | |
func readStr(r io.Reader, b []byte) string { | |
n := readU16BE(b) | |
if int(n) > len(b) { | |
return "err: n>b" | |
} | |
io.ReadFull(r, b[0:n]) // #2 | |
return string(b[0:n]) // #3 | |
return "ok" | |
} | |
func main() { | |
br := strings.NewReader("abcd") | |
readStr(br, make([]byte, 256)) | |
} |