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/*
* Copyright (C) 2012-2014 Arctium Emulation <http://arctium.org>
* Copyright (C) 2008-2015 TrinityCore <http://www.trinitycore.org/>
*
* 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 3 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
* asize_t with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Patcher.hpp"
#include "Helper.hpp"
#include <boost/filesystem.hpp>
#include <fstream>
#include <iostream>
#include <iterator>
#include <set>
#include <stdexcept>
namespace
{
std::vector<unsigned char> read_file(boost::filesystem::path const& path)
{
std::ifstream ifs(path.string(), std::ifstream::binary);
if (!ifs)
throw std::runtime_error("could not open " + path.string());
std::vector<unsigned char> binary;
ifs >> std::noskipws;
ifs.seekg(0, std::ios_base::end);
binary.reserve(ifs.tellg());
ifs.seekg(0, std::ios_base::beg);
std::copy(std::istream_iterator<unsigned char>(ifs), std::istream_iterator<unsigned char>(), std::back_inserter(binary));
return binary;
}
void write_file(boost::filesystem::path const& path, std::vector<unsigned char> const& data)
{
std::ofstream ofs(path.string(), std::ofstream::binary);
if (!ofs)
throw std::runtime_error("could not open " + path.string());
ofs << std::noskipws;
std::copy(data.begin(), data.end(), std::ostream_iterator<unsigned char>(ofs));
}
std::set<size_t> SearchOffset(std::vector<unsigned char> const& binary, std::vector<unsigned char> const& pattern)
{
std::set<size_t> offsets;
for (size_t i = 0; (i + pattern.size()) < binary.size(); i++)
{
size_t matches = 0;
for (size_t j = 0; j < pattern.size(); j++)
{
if (pattern[j] == 0)
{
matches++;
continue;
}
if (binary[i + j] != pattern[j])
break;
matches++;
}
if (matches == pattern.size())
{
offsets.insert(i);
i += matches;
}
}
return offsets.empty() ? throw std::runtime_error("unable to find pattern") : offsets;
}
}
namespace Connection_Patcher
{
Patcher::Patcher(boost::filesystem::path file)
: binary(read_file(file))
, Type(Helper::GetBinaryType(binary))
{}
void Patcher::Patch(std::vector<unsigned char> const& bytes, std::vector<unsigned char> const& pattern)
{
if (binary.size() < pattern.size())
throw std::logic_error("pattern larger than binary");
if (pattern.empty())
return;
for (size_t const offset : SearchOffset(binary, pattern))
{
std::cout << "Found offset " << offset << std::endl;
if (offset != 0 && binary.size() >= bytes.size())
for (size_t i = 0; i < bytes.size(); i++)
binary[offset + i] = bytes[i];
}
}
void Patcher::Finish(boost::filesystem::path out)
{
if (boost::filesystem::exists(out))
boost::filesystem::remove(out);
write_file(out, binary);
}
}
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