1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
// 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))
}
|
