Jeffrey
2 years ago
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// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
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// 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 Andrey N. Sabelnikov 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" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 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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#ifndef _GZIP_ENCODING_H_
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#define _GZIP_ENCODING_H_
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#include "net/http_client_base.h"
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#include "zlib/zlib.h"
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//#include "http.h"
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namespace epee
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{
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namespace net_utils
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{
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class content_encoding_gzip: public i_sub_handler
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{
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public:
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/*! \brief
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* Function content_encoding_gzip : Constructor
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*
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*/
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inline
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content_encoding_gzip(i_target_handler* powner_filter, bool is_deflate_mode = false):m_powner_filter(powner_filter),
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m_is_stream_ended(false),
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m_is_deflate_mode(is_deflate_mode),
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m_is_first_update_in(true)
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{
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memset(&m_zstream_in, 0, sizeof(m_zstream_in));
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memset(&m_zstream_out, 0, sizeof(m_zstream_out));
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int ret = 0;
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if(is_deflate_mode)
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{
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ret = inflateInit(&m_zstream_in);
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ret = deflateInit(&m_zstream_out, Z_DEFAULT_COMPRESSION);
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}else
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{
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ret = inflateInit2(&m_zstream_in, 0x1F);
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ret = deflateInit2(&m_zstream_out, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 0x1F, 8, Z_DEFAULT_STRATEGY);
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}
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}
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/*! \brief
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* Function content_encoding_gzip : Destructor
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*
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*/
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inline
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~content_encoding_gzip()
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{
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inflateEnd(& m_zstream_in );
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deflateEnd(& m_zstream_out );
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}
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/*! \brief
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* Function update_in : Entry point for income data
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*
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*/
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inline
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virtual bool update_in( std::string& piece_of_transfer)
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{
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bool is_first_time_here = m_is_first_update_in;
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m_is_first_update_in = false;
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if(m_pre_decode.size())
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m_pre_decode += piece_of_transfer;
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else
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m_pre_decode.swap(piece_of_transfer);
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piece_of_transfer.clear();
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std::string decode_summary_buff;
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size_t ungzip_size = m_pre_decode.size() * 0x30;
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std::string current_decode_buff(ungzip_size, 'X');
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//Here the cycle is introduced where we unpack the buffer, the cycle is required
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//because of the case where if after unpacking the data will exceed the awaited size, we will not halt with error
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bool continue_unpacking = true;
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bool first_step = true;
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while(m_pre_decode.size() && continue_unpacking)
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{
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//fill buffers
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m_zstream_in.next_in = (Bytef*)m_pre_decode.data();
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m_zstream_in.avail_in = (uInt)m_pre_decode.size();
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m_zstream_in.next_out = (Bytef*)current_decode_buff.data();
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m_zstream_in.avail_out = (uInt)ungzip_size;
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int flag = Z_SYNC_FLUSH;
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int ret = inflate(&m_zstream_in, flag);
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CHECK_AND_ASSERT_MES(ret>=0 || m_zstream_in.avail_out ||m_is_deflate_mode, false, "content_encoding_gzip::update_in() Failed to inflate. err = " << ret);
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if(Z_STREAM_END == ret)
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m_is_stream_ended = true;
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else if(Z_DATA_ERROR == ret && is_first_time_here && m_is_deflate_mode&& first_step)
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{
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// some servers (notably Apache with mod_deflate) don't generate zlib headers
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// insert a dummy header and try again
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static char dummy_head[2] =
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{
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0x8 + 0x7 * 0x10,
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(((0x8 + 0x7 * 0x10) * 0x100 + 30) / 31 * 31) & 0xFF,
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};
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inflateReset(&m_zstream_in);
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m_zstream_in.next_in = (Bytef*) dummy_head;
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m_zstream_in.avail_in = sizeof(dummy_head);
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ret = inflate(&m_zstream_in, Z_NO_FLUSH);
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if (ret != Z_OK)
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{
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LOCAL_ASSERT(0);
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m_pre_decode.swap(piece_of_transfer);
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return false;
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}
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m_zstream_in.next_in = (Bytef*)m_pre_decode.data();
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m_zstream_in.avail_in = (uInt)m_pre_decode.size();
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ret = inflate(&m_zstream_in, Z_NO_FLUSH);
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if (ret != Z_OK)
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{
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LOCAL_ASSERT(0);
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m_pre_decode.swap(piece_of_transfer);
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return false;
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}
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}
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//leave only unpacked part in the output buffer to start with it the next time
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m_pre_decode.erase(0, m_pre_decode.size()-m_zstream_in.avail_in);
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//if decoder gave nothing to return, then everything is ahead, now simply break
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if(ungzip_size == m_zstream_in.avail_out)
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break;
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//decode_buff currently stores data parts that were unpacked, fix this size
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current_decode_buff.resize(ungzip_size - m_zstream_in.avail_out);
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if(decode_summary_buff.size())
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decode_summary_buff += current_decode_buff;
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else
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current_decode_buff.swap(decode_summary_buff);
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current_decode_buff.resize(ungzip_size);
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first_step = false;
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}
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//Process these data if required
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bool res = true;
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res = m_powner_filter->handle_target_data(decode_summary_buff);
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return true;
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}
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/*! \brief
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* Function stop : Entry point for stop signal and flushing cached data buffer.
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*
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*/
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inline
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virtual void stop(std::string& OUT collect_remains)
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{
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}
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protected:
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private:
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/*! \brief
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* Pointer to parent HTTP-parser
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*/
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i_target_handler* m_powner_filter;
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/*! \brief
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* ZLIB object for income stream
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*/
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z_stream m_zstream_in;
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/*! \brief
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* ZLIB object for outcome stream
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*/
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z_stream m_zstream_out;
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/*! \brief
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* Data that could not be unpacked immediately, left to wait for the next packet of data
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*/
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std::string m_pre_decode;
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/*! \brief
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* The data are accumulated for a package in the buffer to send the web client
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*/
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std::string m_pre_encode;
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/*! \brief
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* Signals that stream looks like ended
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*/
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bool m_is_stream_ended;
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/*! \brief
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* If this flag is set, income data is in HTTP-deflate mode
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*/
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bool m_is_deflate_mode;
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/*! \brief
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* Marks that it is a first data packet
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*/
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bool m_is_first_update_in;
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};
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}
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}
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#endif //_GZIP_ENCODING_H_
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