Network Layer 7 rework (Packet handling)

* Move networkcode to a dedicated directory
* Rename clientserver.h to network/networkprotocol.h (Better name) and sanitize some includes
* Create object NetworkPacket
  * It stores command (opcode) and data separated
  * It also stores peer_id
  * Data reading can be done by using a streaming interface
* Change packet routing analysis
  * Remove old conditional analysis
  * Now uses function pointed analysis and add connection state ({Client,Server}::handlers)
  * Connection state permit to categorize condition to handle before analyze packets
  * Create a handler for depreciated messages, instead of duplicating code

1 files changed, 301 insertions, 0 deletions

diff --git a/src/network/networkpacket.cpp b/src/network/networkpacket.cpp
new file mode 100644
index 000000000..80ea830f9
--- /dev/null
+++ b/src/network/networkpacket.cpp
@@ -0,0 +1,301 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2015 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "networkpacket.h"
+#include "debug.h"
+#include "util/serialize.h"
+
+NetworkPacket::NetworkPacket(u8 *data, u32 datasize, u16 peer_id):
+m_peer_id(peer_id)
+{
+	m_read_offset = 0;
+	m_datasize = datasize - 2;
+
+	// Copy data packet to remove opcode
+	m_data = new u8[m_datasize];
+
+	memcpy(m_data, &data[2], m_datasize);
+}
+
+NetworkPacket::~NetworkPacket()
+{
+	delete [] m_data;
+}
+
+char* NetworkPacket::getString(u32 from_offset)
+{
+	assert(from_offset < m_datasize);
+
+	return (char*)&m_data[from_offset];
+}
+
+char NetworkPacket::getChar(u32 offset)
+{
+	assert(offset < m_datasize);
+
+	return m_data[offset];
+}
+
+NetworkPacket& NetworkPacket::operator>>(std::string& dst)
+{
+	u16 strLen = readU16(&m_data[m_read_offset]);
+	m_read_offset += sizeof(u16);
+
+	dst.clear();
+
+	if (strLen == 0) {
+		return *this;
+	}
+
+
+	dst.reserve(strLen);
+	dst.append((char*)&m_data[m_read_offset], strLen);
+
+	m_read_offset += strLen*sizeof(char);
+	return *this;
+}
+
+NetworkPacket& NetworkPacket::operator>>(std::wstring& dst)
+{
+	u16 strLen = readU16(&m_data[m_read_offset]);
+	m_read_offset += sizeof(u16);
+
+	dst.clear();
+
+	if (strLen == 0) {
+		return *this;
+	}
+
+	dst.reserve(strLen);
+	for(u16 i=0; i<strLen; i++) {
+		wchar_t c16 = readU16(&m_data[m_read_offset]);
+		dst.append(&c16, 1);
+		m_read_offset += sizeof(u16);
+	}
+
+	return *this;
+}
+
+std::string NetworkPacket::readLongString()
+{
+	u32 strLen = readU32(&m_data[m_read_offset]);
+	m_read_offset += sizeof(u32);
+
+	if (strLen == 0) {
+		return "";
+	}
+
+	std::string dst;
+
+	dst.reserve(strLen);
+	dst.append((char*)&m_data[m_read_offset], strLen);
+
+	m_read_offset += strLen*sizeof(char);
+
+	return dst;
+}
+
+NetworkPacket& NetworkPacket::operator>>(char& dst)
+{
+	dst = getChar(m_read_offset);
+
+	m_read_offset += sizeof(char);
+	return *this;
+}
+
+u8* NetworkPacket::getU8Ptr(u32 from_offset)
+{
+	assert(from_offset < m_datasize);
+
+	return (u8*)&m_data[from_offset];
+}
+
+u8 NetworkPacket::getU8(u32 offset)
+{
+	assert(offset < m_datasize);
+
+	return m_data[offset];
+}
+
+NetworkPacket& NetworkPacket::operator>>(u8& dst)
+{
+	assert(m_read_offset < m_datasize);
+	dst = m_data[m_read_offset];
+
+	m_read_offset += sizeof(u8);
+	return *this;
+}
+
+NetworkPacket& NetworkPacket::operator>>(bool& dst)
+{
+	assert(m_read_offset < m_datasize);
+	dst = m_data[m_read_offset];
+
+	m_read_offset += sizeof(u8);
+	return *this;
+}
+
+u16 NetworkPacket::getU16(u32 from_offset)
+{
+	assert(from_offset < m_datasize);
+
+	return readU16(&m_data[from_offset]);
+}
+
+NetworkPacket& NetworkPacket::operator>>(u16& dst)
+{
+	dst = getU16(m_read_offset);
+
+	m_read_offset += sizeof(u16);
+	return *this;
+}
+
+u32 NetworkPacket::getU32(u32 from_offset)
+{
+	assert(from_offset < m_datasize);
+
+	return readU32(&m_data[from_offset]);
+}
+
+NetworkPacket& NetworkPacket::operator>>(u32& dst)
+{
+	dst = getU32(m_read_offset);
+
+	m_read_offset += sizeof(u32);
+	return *this;
+}
+
+u64 NetworkPacket::getU64(u32 from_offset)
+{
+	assert(from_offset < m_datasize);
+
+	return readU64(&m_data[from_offset]);
+}
+
+NetworkPacket& NetworkPacket::operator>>(u64& dst)
+{
+	dst = getU64(m_read_offset);
+
+	m_read_offset += sizeof(u64);
+	return *this;
+}
+
+float NetworkPacket::getF1000(u32 from_offset)
+{
+	assert(from_offset < m_datasize);
+
+	return readF1000(&m_data[from_offset]);
+}
+
+NetworkPacket& NetworkPacket::operator>>(float& dst)
+{
+	dst = getF1000(m_read_offset);
+
+	m_read_offset += sizeof(float);
+	return *this;
+}
+
+NetworkPacket& NetworkPacket::operator>>(v2f& dst)
+{
+	assert(m_read_offset < m_datasize);
+
+	dst = readV2F1000(&m_data[m_read_offset]);
+
+	m_read_offset += sizeof(v2f);
+	return *this;
+}
+
+NetworkPacket& NetworkPacket::operator>>(v3f& dst)
+{
+	assert(m_read_offset < m_datasize);
+
+	dst = readV3F1000(&m_data[m_read_offset]);
+
+	m_read_offset += sizeof(v3f);
+	return *this;
+}
+
+s16 NetworkPacket::getS16(u32 from_offset)
+{
+	assert(from_offset < m_datasize);
+
+	return readS16(&m_data[from_offset]);
+}
+
+NetworkPacket& NetworkPacket::operator>>(s16& dst)
+{
+	dst = getS16(m_read_offset);
+
+	m_read_offset += sizeof(s16);
+	return *this;
+}
+
+s32 NetworkPacket::getS32(u32 from_offset)
+{
+	assert(from_offset < m_datasize);
+
+	return readS32(&m_data[from_offset]);
+}
+
+NetworkPacket& NetworkPacket::operator>>(s32& dst)
+{
+	dst = getS32(m_read_offset);
+
+	m_read_offset += sizeof(s32);
+	return *this;
+}
+
+NetworkPacket& NetworkPacket::operator>>(v2s32& dst)
+{
+	dst = readV2S32(&m_data[m_read_offset]);
+
+	m_read_offset += sizeof(v2s32);
+	return *this;
+}
+
+v3s16 NetworkPacket::getV3S16(u32 from_offset)
+{
+	assert(from_offset < m_datasize);
+
+	return readV3S16(&m_data[from_offset]);
+}
+
+NetworkPacket& NetworkPacket::operator>>(v3s16& dst)
+{
+	dst = getV3S16(m_read_offset);
+
+	m_read_offset += sizeof(v3s16);
+	return *this;
+}
+
+v3s32 NetworkPacket::getV3S32(u32 from_offset)
+{
+	assert(from_offset < m_datasize);
+
+	return readV3S32(&m_data[from_offset]);
+}
+
+NetworkPacket& NetworkPacket::operator>>(v3s32& dst)
+{
+	dst = getV3S32(m_read_offset);
+
+	m_read_offset += sizeof(v3s32);
+	return *this;
+}