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/*
* Copyright (C) 2012-2014 Arctium Emulation <http://arctium.org>
* Copyright (C) 2008-2014 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
using Connection_Patcher.Constants;
using System;
using System.IO;
using System.Security.Cryptography;
namespace Connection_Patcher
{
class Helper
{
public static BinaryTypes GetBinaryType(byte[] data)
{
BinaryTypes type = 0u;
using (var reader = new BinaryReader(new MemoryStream(data)))
{
var magic = (uint)reader.ReadUInt16();
// Check MS-DOS magic
if (magic == 0x5A4D)
{
reader.BaseStream.Seek(0x3C, SeekOrigin.Begin);
// Read PE start offset
var peOffset = reader.ReadUInt32();
reader.BaseStream.Seek(peOffset, SeekOrigin.Begin);
var peMagic = reader.ReadUInt32();
// Check PE magic
if (peMagic != 0x4550)
throw new NotSupportedException("Not a PE file!");
type = (BinaryTypes)reader.ReadUInt16();
}
else
{
reader.BaseStream.Seek(0, SeekOrigin.Begin);
type = (BinaryTypes)reader.ReadUInt32();
}
}
return type;
}
public static string GetFileChecksum(byte[] data)
{
using (var stream = new BufferedStream(new MemoryStream(data), 1200000))
{
var sha256 = new SHA256Managed();
var checksum = sha256.ComputeHash(stream);
return BitConverter.ToString(checksum).Replace("-", "").ToLower();
}
}
}
}
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