49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
// Package utils 提供通用的工具函数和辅助类型。
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//
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// 包含字节操作相关的工具函数，用于处理字节切片和缓冲区。
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//
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// 作者：xfy
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package utils
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import (
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"bytes"
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"unsafe"
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)
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// B2s converts byte slice to string without allocation.
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// WARNING: The returned string shares memory with the original slice.
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// Do not modify the slice after calling this function.
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func B2s(b []byte) string {
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if len(b) == 0 {
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return ""
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}
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return unsafe.String(&b[0], len(b))
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}
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// S2b converts string to byte slice without allocation.
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// WARNING: The returned slice shares memory with the original string.
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// Do not modify the slice contents.
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func S2b(s string) []byte {
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if s == "" {
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return nil
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}
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return unsafe.Slice(unsafe.StringData(s), len(s))
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}
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// BytesContainsFold reports whether b contains subslice, case-insensitively.
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func BytesContainsFold(b, sub []byte) bool {
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if len(sub) == 0 {
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return true
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}
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if len(sub) > len(b) {
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return false
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}
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end := len(b) - len(sub) + 1
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for i := 0; i < end; i++ {
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if bytes.EqualFold(b[i:i+len(sub)], sub) {
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return true
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}
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}
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return false
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}
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