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// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
// 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 Andrey N. Sabelnikov 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 THE COPYRIGHT OWNER 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.
//
#pragma once
extern "C" {
#include "zlib/zlib.h"
}
#pragma comment(lib, "zlibstat.lib")
namespace epee
{
namespace zlib_helper
{
inline
bool pack(std::string& target){
std::string result_packed_buff;
z_stream zstream = {0};
int ret = deflateInit(&zstream, Z_DEFAULT_COMPRESSION);
if(target.size())
{
result_packed_buff.resize(target.size()*2, 'X');
zstream.next_in = (Bytef*)target.data();
zstream.avail_in = (uInt)target.size();
zstream.next_out = (Bytef*)result_packed_buff.data();
zstream.avail_out = (uInt)result_packed_buff.size();
ret = deflate(&zstream, Z_FINISH);
CHECK_AND_ASSERT_MES(ret>=0, false, "Failed to deflate. err = " << ret);
if(result_packed_buff.size() != zstream.avail_out)
result_packed_buff.resize(result_packed_buff.size()-zstream.avail_out);
result_packed_buff.erase(0, 2);
target.swap(result_packed_buff);
}
deflateEnd(& zstream );
return true;
}
inline bool unpack(std::string& target)
{
z_stream zstream = {0};
int ret = inflateInit(&zstream);//
std::string decode_summary_buff;
size_t ungzip_buff_size = target.size() * 0x30;
std::string current_decode_buff(ungzip_buff_size, 'X');
while(target.size())
{
zstream.next_out = (Bytef*)current_decode_buff.data();
zstream.avail_out = (uInt)ungzip_buff_size;
int flag = Z_SYNC_FLUSH;
static char dummy_head[2] =
{
0x8 + 0x7 * 0x10,
(((0x8 + 0x7 * 0x10) * 0x100 + 30) / 31 * 31) & 0xFF,
};
zstream.next_in = (Bytef*) dummy_head;
zstream.avail_in = sizeof(dummy_head);
ret = inflate(&zstream, Z_NO_FLUSH);
if (ret != Z_OK)
{
LOCAL_ASSERT(0);
return false;
}
zstream.next_in = (Bytef*)target.data();
zstream.avail_in = (uInt)target.size();
ret = inflate(&zstream, Z_SYNC_FLUSH);
if (ret != Z_OK && ret != Z_STREAM_END)
{
LOCAL_ASSERT(0);
return false;
}
target.erase(0, target.size()-zstream.avail_in);
if(ungzip_buff_size == zstream.avail_out)
{
LOG_ERROR("Can't unpack buffer");
return false;
}
current_decode_buff.resize(ungzip_buff_size - zstream.avail_out);
if(decode_summary_buff.size())
decode_summary_buff += current_decode_buff;
else
current_decode_buff.swap(decode_summary_buff);
current_decode_buff.resize(ungzip_buff_size);
}
inflateEnd(&zstream );
decode_summary_buff.swap(target);
return 1;
}
};
}//namespace epee
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