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71 lines
2.8 KiB
C++
71 lines
2.8 KiB
C++
/*
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* Copyright (c) 2011, Peter Thorson. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the WebSocket++ Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef WEBSOCKET_HYBI_UTIL_HPP
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#define WEBSOCKET_HYBI_UTIL_HPP
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#include "../common.hpp"
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namespace websocketpp {
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namespace processor {
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namespace hybi_util {
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// type used to store a masking key
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union masking_key_type {
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int32_t i;
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char c[4];
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};
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// extract a masking key into a value the size of a machine word. Machine word
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// size must be 4 or 8
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size_t prepare_masking_key(const masking_key_type& key);
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// circularly shifts the supplied prepared masking key by offset bytes
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// prepared_key must be the output of prepare_masking_key with the associated
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// restrictions on the machine word size.
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// offset must be 0, 1, 2, or 3
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size_t circshift_prepared_key(size_t prepared_key, size_t offset);
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// basic byte by byte mask
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template <typename iter_type>
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void byte_mask(iter_type b, iter_type e, const masking_key_type& key, size_t key_offset = 0) {
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size_t key_index = key_offset;
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for (iter_type i = b; i != e; i++) {
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*i ^= key.c[key_index++];
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key_index %= 4;
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}
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}
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// exactly masks the bytes from start to end using key `key`
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void word_mask_exact(char* data,size_t length,const masking_key_type& key);
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} // namespace hybi_util
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} // namespace processor
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} // namespace websocketpp
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#endif // WEBSOCKET_HYBI_UTIL_HPP
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