HashSerializer.h

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/* Copyright (C) 2017 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. 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.
 *
 * 0 A.D. 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 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef INCLUDED_HASHSERIALIZER
#define INCLUDED_HASHSERIALIZER
 
#include "BinarySerializer.h"
 
#include "maths/MD5.h"
 
class CHashSerializerImpl
{
    // We don't care about cryptographic strength, just about detection of
    // unintended changes and about performance, so MD5 is an adequate choice
    typedef MD5 HashFunc;
 
public:
    size_t GetHashLength();
    const u8* ComputeHash();
 
    void Put(const char* UNUSED(name), const u8* data, size_t len)
    {
        m_Hash.Update(data, len);
    }
 
private:
    HashFunc m_Hash;
    u8 m_HashData[HashFunc::DIGESTSIZE];
};
 
class CHashSerializer : public CBinarySerializer<CHashSerializerImpl>
{
public:
    CHashSerializer(const ScriptInterface& scriptInterface);
 
    size_t GetHashLength();
    const u8* ComputeHash();
};
 
#endif // INCLUDED_HASHSERIALIZER