mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-23 02:32:12 +00:00
98263a7de6
* start fixing up tests * fix up tests + automate with drone * fiddle with linting * messing about with drone.yml * some more fiddling * hmmm * add cache * add vendor directory * verbose * ci updates * update some little things * update sig
53 lines
1.2 KiB
Go
53 lines
1.2 KiB
Go
// Copyright 2013 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.
|
|
|
|
// This file was split out from Go's crypto/cipher/xor.go
|
|
|
|
// +build 386 amd64 ppc64 ppc64le s390x appengine
|
|
|
|
package sasl
|
|
|
|
import (
|
|
"unsafe"
|
|
)
|
|
|
|
const wordSize = int(unsafe.Sizeof(uintptr(0)))
|
|
|
|
// xorBytes xors in bulk. It only works on architectures that support unaligned
|
|
// read/writes.
|
|
func xorBytes(dst, a, b []byte) int {
|
|
n := len(a)
|
|
if len(b) < n {
|
|
n = len(b)
|
|
}
|
|
|
|
w := n / wordSize
|
|
if w > 0 {
|
|
dw := *(*[]uintptr)(unsafe.Pointer(&dst))
|
|
aw := *(*[]uintptr)(unsafe.Pointer(&a))
|
|
bw := *(*[]uintptr)(unsafe.Pointer(&b))
|
|
for i := 0; i < w; i++ {
|
|
dw[i] = aw[i] ^ bw[i]
|
|
}
|
|
}
|
|
|
|
for i := (n - n%wordSize); i < n; i++ {
|
|
dst[i] = a[i] ^ b[i]
|
|
}
|
|
|
|
return n
|
|
}
|
|
|
|
// xorWords XORs multiples of 4 or 8 bytes (depending on architecture.) The
|
|
// arguments are assumed to be of equal length.
|
|
func xorWords(dst, a, b []byte) {
|
|
dw := *(*[]uintptr)(unsafe.Pointer(&dst))
|
|
aw := *(*[]uintptr)(unsafe.Pointer(&a))
|
|
bw := *(*[]uintptr)(unsafe.Pointer(&b))
|
|
n := len(b) / wordSize
|
|
for i := 0; i < n; i++ {
|
|
dw[i] = aw[i] ^ bw[i]
|
|
}
|
|
}
|