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/*
* The Mana Client
* Copyright (C) 2004-2009 The Mana World Development Team
* Copyright (C) 2009-2010 The Mana Developers
*
* This file is part of The Mana Client.
*
* 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
* 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 "net/messagein.h"
#include "net/packetcounters.h"
#include "log.h"
#include "utils/stringutils.h"
#define MAKEWORD(low, high) \
((unsigned short)(((unsigned char)(low)) | \
((unsigned short)((unsigned char)(high))) << 8))
namespace Net
{
MessageIn::MessageIn(const char *data, unsigned int length):
mData(data),
mLength(length),
mId(0),
mPos(0)
{
PacketCounters::incInPackets();
DEBUGLOG("MessageIn");
}
unsigned char MessageIn::readInt8()
{
unsigned char value = -1;
if (mPos < mLength)
value = static_cast<unsigned char>(mData[mPos]);
mPos += 1;
PacketCounters::incInBytes(1);
DEBUGLOG("readInt8: " + toString(static_cast<int>(value)));
return value;
}
void MessageIn::readCoordinates(Uint16 &x, Uint16 &y)
{
if (mPos + 3 <= mLength)
{
unsigned char const *p
= reinterpret_cast< unsigned char const * >(mData + mPos);
x = static_cast<short unsigned>(p[0] | ((p[1] & 0x07) << 8));
y = static_cast<short unsigned>((p[1] >> 3) | ((p[2] & 0x3F) << 5));
}
mPos += 3;
PacketCounters::incInBytes(3);
DEBUGLOG("readCoordinates: " + toString(static_cast<int>(x)) + ","
+ toString(static_cast<int>(y)));
}
void MessageIn::readCoordinates(Uint16 &x, Uint16 &y, Uint8 &direction)
{
if (mPos + 3 <= mLength)
{
const char *data = mData + mPos;
Sint16 temp;
temp = MAKEWORD(data[1] & 0x00c0, data[0] & 0x00ff);
x = static_cast<unsigned short>(temp >> 6);
temp = MAKEWORD(data[2] & 0x00f0, data[1] & 0x003f);
y = static_cast<unsigned short>(temp >> 4);
direction = data[2] & 0x000f;
// Translate from eAthena format
switch (direction)
{
case 0:
direction = 1;
break;
case 1:
direction = 3;
break;
case 2:
direction = 2;
break;
case 3:
direction = 6;
break;
case 4:
direction = 4;
break;
case 5:
direction = 12;
break;
case 6:
direction = 8;
break;
case 7:
direction = 9;
break;
default:
// OOPSIE! Impossible or unknown
direction = 0;
}
}
mPos += 3;
PacketCounters::incInBytes(3);
DEBUGLOG("readCoordinates: " + toString((int)x) + "," + toString((int)y));
}
void MessageIn::readCoordinatePair(Uint16 &srcX, Uint16 &srcY,
Uint16 &dstX, Uint16 &dstY)
{
if (mPos + 5 <= mLength)
{
const char *data = mData + mPos;
Sint16 temp;
temp = MAKEWORD(data[3], data[2] & 0x000f);
dstX = static_cast<unsigned short>(temp >> 2);
dstY = MAKEWORD(data[4], data[3] & 0x0003);
temp = MAKEWORD(data[1], data[0]);
srcX = static_cast<unsigned short>(temp >> 6);
temp = MAKEWORD(data[2], data[1] & 0x003f);
srcY = static_cast<unsigned short>(temp >> 4);
}
mPos += 5;
DEBUGLOG("readCoordinatePair: " + toString((int)srcX) + ","
+ toString((int)srcY) + " " + toString((int)dstX) + ","
+ toString((int)dstY));
PacketCounters::incInBytes(5);
}
void MessageIn::skip(unsigned int length)
{
mPos += length;
PacketCounters::incInBytes(length);
DEBUGLOG("skip: " + toString((int)length));
}
std::string MessageIn::readString(int length)
{
// Get string length
if (length < 0)
length = readInt16();
// Make sure the string isn't erroneous
if (length < 0 || mPos + length > mLength)
{
mPos = mLength + 1;
DEBUGLOG("readString error");
return "";
}
// Read the string
char const *stringBeg = mData + mPos;
char const *stringEnd
= static_cast<char const *>(memchr(stringBeg, '\0', length));
std::string readString(stringBeg,
stringEnd ? stringEnd - stringBeg : length);
mPos += length;
PacketCounters::incInBytes(length);
DEBUGLOG("readString: " + readString);
return readString;
}
std::string MessageIn::readRawString(int length)
{
// 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 "";
}
// Read the string
char const *stringBeg = mData + mPos;
char const *stringEnd
= static_cast<char const *>(memchr(stringBeg, '\0', length));
std::string readString(stringBeg,
stringEnd ? stringEnd - stringBeg : length);
mPos += length;
PacketCounters::incInBytes(length);
DEBUGLOG("readString: " + readString);
if (stringEnd)
{
long len2 = length - (stringEnd - stringBeg) - 1;
char const *stringBeg2 = stringEnd + 1;
char const *stringEnd2
= static_cast<char const *>(memchr(stringBeg2, '\0', len2));
std::string hiddenPart = std::string(stringBeg2,
stringEnd2 ? stringEnd2 - stringBeg2 : len2);
if (hiddenPart.length() > 0)
{
DEBUGLOG("readString2: " + hiddenPart);
return readString + "|" + hiddenPart;
}
}
return readString;
}
}
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