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vendor/github.com/gorilla/websocket/mask.go
55 строк
1 KB
Fabio Bertinatto
bump(k8s): update k8s.io/* dependencies to v1.33.2
17 июл 2025, 12:12
17 июл 2025, 12:12
fc21ea0
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// Copyright 2016 The Gorilla WebSocket Authors. All rights reserved. Use of // this source code is governed by a BSD-style license that can be found in the // LICENSE file. //go:build !appengine // +build !appengine package websocket import "unsafe" const wordSize = int(unsafe.Sizeof(uintptr(0))) func maskBytes(key [4]byte, pos int, b []byte) int { // Mask one byte at a time for small buffers. if len(b) < 2*wordSize { for i := range b { b[i] ^= key[pos&3] pos++ } return pos & 3 } // Mask one byte at a time to word boundary. if n := int(uintptr(unsafe.Pointer(&b[0]))) % wordSize; n != 0 { n = wordSize - n for i := range b[:n] { b[i] ^= key[pos&3] pos++ } b = b[n:] } // Create aligned word size key. var k [wordSize]byte for i := range k { k[i] = key[(pos+i)&3] } kw := *(*uintptr)(unsafe.Pointer(&k)) // Mask one word at a time. n := (len(b) / wordSize) * wordSize for i := 0; i < n; i += wordSize { *(*uintptr)(unsafe.Pointer(uintptr(unsafe.Pointer(&b[0])) + uintptr(i))) ^= kw } // Mask one byte at a time for remaining bytes. b = b[n:] for i := range b { b[i] ^= key[pos&3] pos++ } return pos & 3 }