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IXWebSocketPerMessageDeflate.cpp
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98 lines (85 loc) · 4.04 KB
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/*
* Copyright (c) 2015, Peter Thorson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the WebSocket++ Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Author: Benjamin Sergeant
* Copyright (c) 2018 Machine Zone, Inc. All rights reserved.
*
* Adapted from websocketpp/extensions/permessage_deflate/enabled.hpp
* (same license as MZ: https://opensource.org/licenses/BSD-3-Clause)
*
* - Reused zlib compression + decompression bits.
* - Refactored to have 2 class for compression and decompression, to allow multi-threading
* and make sure that _compressBuffer is not shared between threads.
* - Original code wasn't working for some reason, I had to add checks
* for the presence of the kEmptyUncompressedBlock at the end of buffer so that servers
* would start accepting receiving/decoding compressed messages. Original code was probably
* modifying the passed in buffers before processing in enabled.hpp ?
* - Added more documentation.
*
* Per message Deflate RFC: https://tools.ietf.org/html/rfc7692
* Chrome websocket ->
* https://github.com/chromium/chromium/tree/2ca8c5037021c9d2ecc00b787d58a31ed8fc8bcb/net/websockets
*
*/
#include <cstdint>
#include "IXWebSocketPerMessageDeflate.h"
#include "IXUniquePtr.h"
#include "IXWebSocketPerMessageDeflateCodec.h"
#include "IXWebSocketPerMessageDeflateOptions.h"
namespace ix
{
WebSocketPerMessageDeflate::WebSocketPerMessageDeflate()
: _compressor(ix::make_unique<WebSocketPerMessageDeflateCompressor>())
, _decompressor(ix::make_unique<WebSocketPerMessageDeflateDecompressor>())
{
;
}
WebSocketPerMessageDeflate::~WebSocketPerMessageDeflate()
{
;
}
bool WebSocketPerMessageDeflate::init(
const WebSocketPerMessageDeflateOptions& perMessageDeflateOptions)
{
bool clientNoContextTakeover = perMessageDeflateOptions.getClientNoContextTakeover();
uint8_t deflateBits = perMessageDeflateOptions.getClientMaxWindowBits();
uint8_t inflateBits = perMessageDeflateOptions.getServerMaxWindowBits();
return _compressor->init(deflateBits, clientNoContextTakeover) &&
_decompressor->init(inflateBits, clientNoContextTakeover);
}
bool WebSocketPerMessageDeflate::compress(const IXWebSocketSendData& in, std::string& out)
{
return _compressor->compress(in, out);
}
bool WebSocketPerMessageDeflate::compress(const std::string& in, std::string& out)
{
return _compressor->compress(in, out);
}
bool WebSocketPerMessageDeflate::decompress(const std::string& in, std::string& out)
{
return _decompressor->decompress(in, out);
}
} // namespace ix