tidb bytes 代码
文件路径：/br/pkg/lightning/mydump/bytes.go
/ Copyright 2009 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.
/ Package bytes implements functions for the manipulation of byte slices.
/ It is analogous to the facilities of the strings package.
/ this is copy from `bytes/bytes.go`
package mydump
/ byteSet is a 32-byte value, where each bit represents the presence of a
/ given byte value in the set.
type byteSet [8]uint32
/ makeByteSet creates a set of byte value.
func makeByteSet(chars []byte) (as byteSet) {
for i := 0; i < len(chars); i++ {
c := chars[i]
as[c>>5] |= 1 << uint(c&31)
}
return as
}
/ contains reports whether c is inside the set.
func (as *byteSet) contains(c byte) bool {
return (as[c>>5] & (1 << uint(c&31))) != 0
}
/ IndexAnyByte returns the byte index of the first occurrence in s of any of the byte
/ points in chars. It returns -1 if there is no code point in common.
func IndexAnyByte(s []byte, as *byteSet) int {
for i, c := range s {
if as.contains(c) {
return i
}
}
return -1
}