blob: 0f596c71aad8a77193303f8351f73096b1f70f6f (
plain)
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
38
39
40
41
42
43
44
45
46
47
48
49
|
// +build unsafe
// Copyright (c) 2012-2015 Ugorji Nwoke. All rights reserved.
// Use of this source code is governed by a MIT license found in the LICENSE file.
package codec
import (
"unsafe"
)
// This file has unsafe variants of some helper methods.
type unsafeString struct {
Data uintptr
Len int
}
type unsafeSlice struct {
Data uintptr
Len int
Cap int
}
// stringView returns a view of the []byte as a string.
// In unsafe mode, it doesn't incur allocation and copying caused by conversion.
// In regular safe mode, it is an allocation and copy.
func stringView(v []byte) string {
if len(v) == 0 {
return ""
}
bx := (*unsafeSlice)(unsafe.Pointer(&v))
sx := unsafeString{bx.Data, bx.Len}
return *(*string)(unsafe.Pointer(&sx))
}
// bytesView returns a view of the string as a []byte.
// In unsafe mode, it doesn't incur allocation and copying caused by conversion.
// In regular safe mode, it is an allocation and copy.
func bytesView(v string) []byte {
if len(v) == 0 {
return zeroByteSlice
}
sx := (*unsafeString)(unsafe.Pointer(&v))
bx := unsafeSlice{sx.Data, sx.Len, sx.Len}
return *(*[]byte)(unsafe.Pointer(&bx))
}
|
