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139 lines
3.9 KiB
C++
139 lines
3.9 KiB
C++
// 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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#pragma once
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extern "C" {
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#include "zlib/zlib.h"
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}
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#pragma comment(lib, "zlibstat.lib")
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namespace epee
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{
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namespace zlib_helper
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{
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inline
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bool pack(std::string& target){
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std::string result_packed_buff;
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z_stream zstream = {0};
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int ret = deflateInit(&zstream, Z_DEFAULT_COMPRESSION);
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if(target.size())
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{
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result_packed_buff.resize(target.size()*2, 'X');
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zstream.next_in = (Bytef*)target.data();
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zstream.avail_in = (uInt)target.size();
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zstream.next_out = (Bytef*)result_packed_buff.data();
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zstream.avail_out = (uInt)result_packed_buff.size();
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ret = deflate(&zstream, Z_FINISH);
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CHECK_AND_ASSERT_MES(ret>=0, false, "Failed to deflate. err = " << ret);
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if(result_packed_buff.size() != zstream.avail_out)
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result_packed_buff.resize(result_packed_buff.size()-zstream.avail_out);
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result_packed_buff.erase(0, 2);
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target.swap(result_packed_buff);
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}
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deflateEnd(& zstream );
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return true;
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}
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inline bool unpack(std::string& target)
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{
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z_stream zstream = {0};
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int ret = inflateInit(&zstream);//
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std::string decode_summary_buff;
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size_t ungzip_buff_size = target.size() * 0x30;
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std::string current_decode_buff(ungzip_buff_size, 'X');
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while(target.size())
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{
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zstream.next_out = (Bytef*)current_decode_buff.data();
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zstream.avail_out = (uInt)ungzip_buff_size;
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int flag = Z_SYNC_FLUSH;
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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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zstream.next_in = (Bytef*) dummy_head;
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zstream.avail_in = sizeof(dummy_head);
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ret = inflate(&zstream, 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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return false;
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}
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zstream.next_in = (Bytef*)target.data();
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zstream.avail_in = (uInt)target.size();
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ret = inflate(&zstream, Z_SYNC_FLUSH);
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if (ret != Z_OK && ret != Z_STREAM_END)
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{
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LOCAL_ASSERT(0);
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return false;
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}
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target.erase(0, target.size()-zstream.avail_in);
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if(ungzip_buff_size == zstream.avail_out)
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{
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LOG_ERROR("Can't unpack buffer");
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return false;
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}
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current_decode_buff.resize(ungzip_buff_size - zstream.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_buff_size);
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}
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inflateEnd(&zstream );
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decode_summary_buff.swap(target);
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return 1;
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}
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};
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}//namespace epee
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