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/*
RailControl - Model Railway Control Software
Copyright (c) 2017-2025 by Teddy / Dominik Mahrer - www.railcontrol.org
RailControl is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
RailControl is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with RailControl; see the file LICENCE. If not see
<http://www.gnu.org/licenses/>.
*/
#include <string>
#include <zlib.h>
#include "Hardware/ZLib.h"
#include "Utils/Utils.h"
using std::string;
string ZLib::Compress(const string& input)
{
long inputSize = input.size();
unsigned long outputSize = inputSize + 12;
unsigned char* outputBuffer = reinterpret_cast<unsigned char*>(malloc(outputSize));
int nResult = compress2(outputBuffer, &outputSize, reinterpret_cast<const unsigned char*>(input.c_str()), inputSize, 9);
if (nResult != Z_OK)
{
return "";
}
string outputData(reinterpret_cast<char*>(outputBuffer), outputSize);
free(outputBuffer);
return outputData;
}
string ZLib::UnCompress(const char* input, const size_t inputSize, const size_t outputSize)
{
z_stream strm;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
int ret = inflateInit(&strm);
if (ret != Z_OK)
{
return "";
}
strm.avail_in = inputSize;
strm.avail_out = outputSize;
strm.next_in = reinterpret_cast<unsigned char*>(const_cast<char*>(input));
char* outputBuffer = reinterpret_cast<char*>(malloc(outputSize));
strm.next_out = reinterpret_cast<unsigned char*>(outputBuffer);
ret = inflate(&strm, Z_NO_FLUSH);
inflateEnd(&strm);
if (ret != Z_STREAM_END)
{
free(outputBuffer);
return "";
}
std::string output(outputBuffer, outputSize);
free(outputBuffer);
return output;
}
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