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/*
* Copyright (C) 2001-2019 Jacek Sieka, arnetheduck on gmail point com
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <cstddef>
#include <cstdint>
#include <string>
#include <zlib.h>
namespace dcpp {
using std::string;
class ZFilter {
public:
/** Compression will automatically be turned off if below this... */
static const double MIN_COMPRESSION_LEVEL;
ZFilter();
~ZFilter();
/**
* Compress data.
* @param in Input data
* @param insize Input size (Set to 0 to indicate that no more data will follow)
* @param out Output buffer
* @param outsize Output size, set to compressed size on return.
* @return True if there's more processing to be done
*/
bool operator()(const void* in, size_t& insize, void* out, size_t& outsize);
private:
z_stream zs;
int64_t totalIn;
int64_t totalOut;
bool compressing;
};
class UnZFilter {
public:
UnZFilter();
~UnZFilter();
/**
* Decompress data.
* @param in Input data
* @param insize Input size (Set to 0 to indicate that no more data will follow)
* @param out Output buffer
* @param outsize Output size, set to decompressed size on return.
* @return True if there's more processing to be done
*/
bool operator()(const void* in, size_t& insize, void* out, size_t& outsize);
private:
z_stream zs;
};
class GZ {
public:
static void decompress(const string& source, const string& target);
};
class CRC32Filter {
public:
CRC32Filter() : crc(crc32(0, NULL, 0)) { }
// TODO 64-bits?
void operator()(const void* buf, size_t len) { crc = crc32(crc, (const Bytef*)buf, (uInt)len); }
uint32_t getValue() const { return crc; }
private:
uint32_t crc;
};
} // namespace dcpp
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