source/simulation2/serialization/HashSerializer.h

   1 /* Copyright (C) 2017 Wildfire Games.
   2  * This file is part of 0 A.D.
   3  *
   4  * 0 A.D. is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * 0 A.D. is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef INCLUDED_HASHSERIALIZER
  19 #define INCLUDED_HASHSERIALIZER
  20
  21 #include "BinarySerializer.h"
  22
  23 #include "maths/MD5.h"
  24
  25 class CHashSerializerImpl
  26 {
  27         // We don't care about cryptographic strength, just about detection of
  28         // unintended changes and about performance, so MD5 is an adequate choice
  29         typedef MD5 HashFunc;
  30
  31 public:
  32         size_t GetHashLength();
  33         const u8* ComputeHash();
  34
  35         void Put(const char* UNUSED(name), const u8* data, size_t len)
  36         {
  37                 m_Hash.Update(data, len);
  38         }
  39
  40 private:
  41         HashFunc m_Hash;
  42         u8 m_HashData[HashFunc::DIGESTSIZE];
  43 };
  44
  45 class CHashSerializer : public CBinarySerializer<CHashSerializerImpl>
  46 {
  47 public:
  48         CHashSerializer(const ScriptInterface& scriptInterface);
  49
  50         size_t GetHashLength();
  51         const u8* ComputeHash();
  52 };
  53
  54 #endif // INCLUDED_HASHSERIALIZER