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55 lines
1.1 KiB
Go
55 lines
1.1 KiB
Go
// Copyright 2021, Chef. All rights reserved.
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// https://github.com/q191201771/naza
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//
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// Use of this source code is governed by a MIT-style license
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// that can be found in the License file.
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//
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// Author: Chef (191201771@qq.com)
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package nazabytes
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import "unsafe"
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type sliceT struct {
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array unsafe.Pointer
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len int
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cap int
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}
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type stringStruct struct {
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str unsafe.Pointer
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len int
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}
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func Bytes2StringRef(b []byte) string {
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return *(*string)(unsafe.Pointer(&b))
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}
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func String2BytesRef(s string) []byte {
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str := (*stringStruct)(unsafe.Pointer(&s))
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ret := sliceT{array: unsafe.Pointer(str.str), len: str.len, cap: str.len}
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return *(*[]byte)(unsafe.Pointer(&ret))
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}
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// ---------------------------------------------------------------------------------------------------------------------
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// Sub
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//
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// 注意，内部会处理`b`大小不够，越界访问等情况
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//
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func Sub(b []byte, index int, length int) []byte {
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if index >= len(b) {
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return nil
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}
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if index+length > len(b) {
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return b[index:]
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}
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return b[index : index+length]
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}
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func Prefix(b []byte, length int) []byte {
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return Sub(b, 0, length)
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}
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