Core/Packets: Implemented BitStream helper class

- added Static BitConverter class
- upgraded the ByteBuffer class for easier usage

src/server/shared/Packets/ByteBuffer.cpp

@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2008-2011 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 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "ByteBuffer.h"
+
+void BitStream::Clear()
+{
+    _data.clear();
+    _rpos = _wpos = 0;
+}
+
+uint8 BitStream::GetBit(uint32 bit)
+{
+    ASSERT(_data.size() > bit);
+    return _data[bit];
+}
+
+uint8 BitStream::ReadBit()
+{
+    ASSERT(_data.size() < _rpos);
+    uint8 b = _data[_rpos];
+    ++_rpos;
+    return b;
+}
+
+void BitStream::WriteBit(uint32 bit)
+{
+    _data.push_back(bit ? uint8(1) : uint8(0));
+    ++_wpos;
+}
+
+template <typename T> void BitStream::WriteBits(T value, size_t bits)
+{
+    for (int32 i = bits-1; i >= 0; --i)
+        WriteBit((value >> i) & 1);
+}
+        
+bool BitStream::Emtpy ()
+{
+    return _data.empty();
+}
+
+void BitStream::Reverse()
+{
+    uint32 len = GetLenght();
+    std::vector<uint8> b = _data;
+    Clear();
+
+    for(uint32 i = len; i > 0; --i)
+        WriteBit(b[i-1]);
+}
+
+void BitStream::Print()
+{
+    if (!sLog->IsOutDebug())
+        return;
+	std::stringstream ss;
+	ss << "BitStream: ";
+    for (uint32 i = 0; i < GetLenght(); ++i)
+		ss << uint32(GetBit(i)) << " ";
+
+	sLog->outDebug(LOG_FILTER_NETWORKIO, ss.str().c_str());
+}
+
+ByteBuffer::ByteBuffer(size_t res, bool init): _rpos(0), _wpos(0), _bitpos(8), _curbitval(0)
+{
+    if (init)
+    {
+        for (size_t i = 0; i < res; ++i)
+        {
+            *this << uint8(0);
+        }
+    } else
+        _storage.reserve(res);
+}