1 files changed, 157 insertions, 0 deletions
diff --git a/src/server/game/UpdateData.cpp b/src/server/game/UpdateData.cpp
new file mode 100644
index 00000000000..68f0501f304
--- /dev/null
+++ b/src/server/game/UpdateData.cpp
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
+ *
+ * Copyright (C) 2008-2010 Trinity <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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "Common.h"
+#include "ByteBuffer.h"
+#include "WorldPacket.h"
+#include "UpdateData.h"
+#include "Log.h"
+#include "Opcodes.h"
+#include "World.h"
+#include <zlib/zlib.h>
+
+UpdateData::UpdateData() : m_blockCount(0)
+{
+}
+
+void UpdateData::AddOutOfRangeGUID(std::set<uint64>& guids)
+{
+    m_outOfRangeGUIDs.insert(guids.begin(),guids.end());
+}
+
+void UpdateData::AddOutOfRangeGUID(const uint64 &guid)
+{
+    m_outOfRangeGUIDs.insert(guid);
+}
+
+void UpdateData::AddUpdateBlock(const ByteBuffer &block)
+{
+    m_data.append(block);
+    ++m_blockCount;
+}
+
+void UpdateData::Compress(void* dst, uint32 *dst_size, void* src, int src_size)
+{
+    z_stream c_stream;
+
+    c_stream.zalloc = (alloc_func)0;
+    c_stream.zfree = (free_func)0;
+    c_stream.opaque = (voidpf)0;
+
+    // default Z_BEST_SPEED (1)
+    int z_res = deflateInit(&c_stream, sWorld.getConfig(CONFIG_COMPRESSION));
+    if (z_res != Z_OK)
+    {
+        sLog.outError("Can't compress update packet (zlib: deflateInit) Error code: %i (%s)",z_res,zError(z_res));
+        *dst_size = 0;
+        return;
+    }
+
+    c_stream.next_out = (Bytef*)dst;
+    c_stream.avail_out = *dst_size;
+    c_stream.next_in = (Bytef*)src;
+    c_stream.avail_in = (uInt)src_size;
+
+    z_res = deflate(&c_stream, Z_NO_FLUSH);
+    if (z_res != Z_OK)
+    {
+        sLog.outError("Can't compress update packet (zlib: deflate) Error code: %i (%s)",z_res,zError(z_res));
+        *dst_size = 0;
+        return;
+    }
+
+    if (c_stream.avail_in != 0)
+    {
+        sLog.outError("Can't compress update packet (zlib: deflate not greedy)");
+        *dst_size = 0;
+        return;
+    }
+
+    z_res = deflate(&c_stream, Z_FINISH);
+    if (z_res != Z_STREAM_END)
+    {
+        sLog.outError("Can't compress update packet (zlib: deflate should report Z_STREAM_END instead %i (%s)",z_res,zError(z_res));
+        *dst_size = 0;
+        return;
+    }
+
+    z_res = deflateEnd(&c_stream);
+    if (z_res != Z_OK)
+    {
+        sLog.outError("Can't compress update packet (zlib: deflateEnd) Error code: %i (%s)",z_res,zError(z_res));
+        *dst_size = 0;
+        return;
+    }
+
+    *dst_size = c_stream.total_out;
+}
+
+bool UpdateData::BuildPacket(WorldPacket *packet)
+{
+    ASSERT(packet->empty());                                // shouldn't happen
+
+    ByteBuffer buf(4 + (m_outOfRangeGUIDs.empty() ? 0 : 1 + 4 + 9 * m_outOfRangeGUIDs.size()) + m_data.wpos());
+
+    buf << (uint32) (!m_outOfRangeGUIDs.empty() ? m_blockCount + 1 : m_blockCount);
+
+    if (!m_outOfRangeGUIDs.empty())
+    {
+        buf << (uint8) UPDATETYPE_OUT_OF_RANGE_OBJECTS;
+        buf << (uint32) m_outOfRangeGUIDs.size();
+
+        for (std::set<uint64>::const_iterator i = m_outOfRangeGUIDs.begin(); i != m_outOfRangeGUIDs.end(); ++i)
+        {
+            buf.appendPackGUID(*i);
+        }
+    }
+
+    buf.append(m_data);
+
+    size_t pSize = buf.wpos();                              // use real used data size
+
+    if (pSize > 100)                                       // compress large packets
+    {
+        uint32 destsize = compressBound(pSize);
+        packet->resize(destsize + sizeof(uint32));
+
+        packet->put<uint32>(0, pSize);
+        Compress(const_cast<uint8*>(packet->contents()) + sizeof(uint32), &destsize, (void*)buf.contents(), pSize);
+        if (destsize == 0)
+            return false;
+
+        packet->resize(destsize + sizeof(uint32));
+        packet->SetOpcode(SMSG_COMPRESSED_UPDATE_OBJECT);
+    }
+    else                                                    // send small packets without compression
+    {
+        packet->append(buf);
+        packet->SetOpcode(SMSG_UPDATE_OBJECT);
+    }
+
+    return true;
+}
+
+void UpdateData::Clear()
+{
+    m_data.clear();
+    m_outOfRangeGUIDs.clear();
+    m_blockCount = 0;
+}
+