src/game/UpdateData.cpp

   1 /*
   2  * Copyright (C) 2005-2010 MaNGOS <http://getmangos.com/>
   3  *
   4  * This program 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  * This program 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 this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include "Common.h"
  20 #include "ByteBuffer.h"
  21 #include "WorldPacket.h"
  22 #include "UpdateData.h"
  23 #include "Log.h"
  24 #include "Opcodes.h"
  25 #include "World.h"
  26 #include "ObjectGuid.h"
  27 #include <zlib/zlib.h>
  28
  29 UpdateData::UpdateData() : m_blockCount(0)
  30 {
  31 }
  32
  33 void UpdateData::AddOutOfRangeGUID(ObjectGuidSet& guids)
  34 {
  35     m_outOfRangeGUIDs.insert(guids.begin(),guids.end());
  36 }
  37
  38 void UpdateData::AddOutOfRangeGUID(ObjectGuid const &guid)
  39 {
  40     m_outOfRangeGUIDs.insert(guid);
  41 }
  42
  43 void UpdateData::AddUpdateBlock(const ByteBuffer &block)
  44 {
  45     m_data.append(block);
  46     ++m_blockCount;
  47 }
  48
  49 void UpdateData::Compress(void* dst, uint32 *dst_size, void* src, int src_size)
  50 {
  51     z_stream c_stream;
  52
  53     c_stream.zalloc = (alloc_func)0;
  54     c_stream.zfree = (free_func)0;
  55     c_stream.opaque = (voidpf)0;
  56
  57     // default Z_BEST_SPEED (1)
  58     int z_res = deflateInit(&c_stream, sWorld.getConfig(CONFIG_UINT32_COMPRESSION));
  59     if (z_res != Z_OK)
  60     {
  61         sLog.outError("Can't compress update packet (zlib: deflateInit) Error code: %i (%s)",z_res,zError(z_res));
  62         *dst_size = 0;
  63         return;
  64     }
  65
  66     c_stream.next_out = (Bytef*)dst;
  67     c_stream.avail_out = *dst_size;
  68     c_stream.next_in = (Bytef*)src;
  69     c_stream.avail_in = (uInt)src_size;
  70
  71     z_res = deflate(&c_stream, Z_NO_FLUSH);
  72     if (z_res != Z_OK)
  73     {
  74         sLog.outError("Can't compress update packet (zlib: deflate) Error code: %i (%s)",z_res,zError(z_res));
  75         *dst_size = 0;
  76         return;
  77     }
  78
  79     if (c_stream.avail_in != 0)
  80     {
  81         sLog.outError("Can't compress update packet (zlib: deflate not greedy)");
  82         *dst_size = 0;
  83         return;
  84     }
  85
  86     z_res = deflate(&c_stream, Z_FINISH);
  87     if (z_res != Z_STREAM_END)
  88     {
  89         sLog.outError("Can't compress update packet (zlib: deflate should report Z_STREAM_END instead %i (%s)",z_res,zError(z_res));
  90         *dst_size = 0;
  91         return;
  92     }
  93
  94     z_res = deflateEnd(&c_stream);
  95     if (z_res != Z_OK)
  96     {
  97         sLog.outError("Can't compress update packet (zlib: deflateEnd) Error code: %i (%s)",z_res,zError(z_res));
  98         *dst_size = 0;
  99         return;
 100     }
 101
 102     *dst_size = c_stream.total_out;
 103 }
 104
 105 bool UpdateData::BuildPacket(WorldPacket *packet)
 106 {
 107     ASSERT(packet->empty());                                // shouldn't happen
 108
 109     ByteBuffer buf(4 + (m_outOfRangeGUIDs.empty() ? 0 : 1 + 4 + 9 * m_outOfRangeGUIDs.size()) + m_data.wpos());
 110
 111     buf << (uint32) (!m_outOfRangeGUIDs.empty() ? m_blockCount + 1 : m_blockCount);
 112
 113     if(!m_outOfRangeGUIDs.empty())
 114     {
 115         buf << (uint8) UPDATETYPE_OUT_OF_RANGE_OBJECTS;
 116         buf << (uint32) m_outOfRangeGUIDs.size();
 117
 118         for(ObjectGuidSet::const_iterator i = m_outOfRangeGUIDs.begin(); i != m_outOfRangeGUIDs.end(); ++i)
 119             buf << i->WriteAsPacked();
 120     }
 121
 122     buf.append(m_data);
 123
 124     size_t pSize = buf.wpos();                              // use real used data size
 125
 126     if (pSize > 100 )                                       // compress large packets
 127     {
 128         uint32 destsize = compressBound(pSize);
 129         packet->resize( destsize + sizeof(uint32) );
 130
 131         packet->put<uint32>(0, pSize);
 132         Compress(const_cast<uint8*>(packet->contents()) + sizeof(uint32), &destsize, (void*)buf.contents(), pSize);
 133         if (destsize == 0)
 134             return false;
 135
 136         packet->resize( destsize + sizeof(uint32) );
 137         packet->SetOpcode( SMSG_COMPRESSED_UPDATE_OBJECT );
 138     }
 139     else                                                    // send small packets without compression
 140     {
 141         packet->append( buf );
 142         packet->SetOpcode( SMSG_UPDATE_OBJECT );
 143     }
 144
 145     return true;
 146 }
 147
 148 void UpdateData::Clear()
 149 {
 150     m_data.clear();
 151     m_outOfRangeGUIDs.clear();
 152     m_blockCount = 0;
 153 }