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/*
* The Mana Server
* Copyright (C) 2004-2010 The Mana World Development Team
* Copyright (C) 2010-2012 The Mana Developers
*
* This file is part of The Mana Server.
*
* The Mana Server 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
* any later version.
*
* The Mana Server 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 The Mana Server. If not, see <http://www.gnu.org/licenses/>.
*/
#include <cstring>
#include <iomanip>
#include <iostream>
#include <string>
#include <enet/enet.h>
#ifndef USE_NATIVE_DOUBLE
#include <sstream>
#endif
#include <stdint.h>
#include "net/messagein.h"
#include "utils/logger.h"
// Not enabled by default since this will cause assertions on message errors,
// which may also originate from the client.
//#define DEBUG_NETWORK
#ifdef DEBUG_NETWORK
#include <cassert>
#define ASSERT_IF(x) assert(x); if (x)
#else
#define ASSERT_IF(x) if (x)
#endif
MessageIn::MessageIn(const char *data, unsigned short length):
mData(data),
mLength(length),
mDebugMode(false),
mPos(0)
{
// Read the message ID
mId = readInt16();
// Read and clear the debug flag
mDebugMode = mId & ManaServ::XXMSG_DEBUG_FLAG;
mId &= ~ManaServ::XXMSG_DEBUG_FLAG;
}
int MessageIn::readInt8()
{
int value = -1;
if (!readValueType(ManaServ::Int8))
return value;
ASSERT_IF (mPos < mLength)
{
value = (unsigned char) mData[mPos];
}
else
{
LOG_DEBUG("Unable to read 1 byte in " << mId << "!");
}
mPos += 1;
return value;
}
int MessageIn::readInt16()
{
int value = -1;
if (!readValueType(ManaServ::Int16))
return value;
ASSERT_IF (mPos + 2 <= mLength)
{
uint16_t t;
memcpy(&t, mData + mPos, 2);
value = (short) ENET_NET_TO_HOST_16(t);
}
else
{
LOG_DEBUG("Unable to read 2 bytes in " << mId << "!");
}
mPos += 2;
return value;
}
int MessageIn::readInt32()
{
int value = -1;
if (!readValueType(ManaServ::Int32))
return value;
ASSERT_IF (mPos + 4 <= mLength)
{
uint32_t t;
memcpy(&t, mData + mPos, 4);
value = ENET_NET_TO_HOST_32(t);
}
else
{
LOG_DEBUG("Unable to read 4 bytes in " << mId << "!");
}
mPos += 4;
return value;
}
double MessageIn::readDouble()
{
double value = -1;
if (!readValueType(ManaServ::Double))
return value;
#ifdef USE_NATIVE_DOUBLE
if (mPos + sizeof(double) <= mLength)
memcpy(&value, mData + mPos, sizeof(double));
mPos += sizeof(double);
#else
int length = readInt8();
std::istringstream i (readString(length));
i >> value;
#endif
return value;
}
std::string MessageIn::readString(int length)
{
if (!readValueType(ManaServ::String))
return std::string();
if (mDebugMode)
{
int fixedLength = readInt16();
#ifdef DEBUG_NETWORK
assert(fixedLength == length);
#endif
if (fixedLength != length)
{
LOG_DEBUG("Expected string of length " << length <<
" but received length " << fixedLength);
mPos = mLength + 1;
return std::string();
}
}
// Get string length
if (length < 0)
{
length = readInt16();
}
// Make sure the string isn't erroneous
if (length < 0 || mPos + length > mLength)
{
mPos = mLength + 1;
return std::string();
}
// Read the string
const char *stringBeg = mData + mPos;
const auto stringEnd = (const char *)memchr(stringBeg, '\0', length);
std::string readString(stringBeg,
stringEnd ? stringEnd - stringBeg : length);
mPos += length;
return readString;
}
bool MessageIn::readValueType(ManaServ::ValueType type)
{
if (!mDebugMode) // Verification not possible
return true;
ASSERT_IF (mPos < mLength)
{
int t = (unsigned char) mData[mPos];
++mPos;
ASSERT_IF (t == type)
{
return true;
}
else
{
LOG_DEBUG("Attempt to read " << type << " but got " << t);
}
}
else
{
LOG_DEBUG("Attempt to read " << type << " but no more data available");
}
return false;
}
std::ostream&
operator <<(std::ostream &os, const MessageIn &msg)
{
os << std::setw(6) << std::hex << std::showbase << std::internal
<< std::setfill('0') << msg.getId() << std::dec;
if (!msg.mDebugMode)
{
os << " (" << msg.getLength() << " B)";
}
else
{
os << " { ";
MessageIn m(msg.mData, msg.mLength);
while (m.getUnreadLength() > 0)
{
if (m.mPos > 3)
os << ", ";
unsigned char valueType = m.mData[m.mPos];
switch (valueType)
{
case ManaServ::Int8:
os << "B " << m.readInt8();
break;
case ManaServ::Int16:
os << "W " << m.readInt16();
break;
case ManaServ::Int32:
os << "D " << m.readInt32();
break;
case ManaServ::String: {
// Peak ahead at a possible fixed length
unsigned short pos = m.mPos;
m.mPos++;
int length = m.readInt16();
m.mPos = pos;
if (length < 0)
os << "S " << m.readString();
else
os << "S[" << length << "] " << m.readString(length);
break;
}
case ManaServ::Double:
os << "d " << m.readDouble();
break;
default:
os << "??? }";
return os; // Stop after error
}
}
os << " }";
}
return os;
}
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