/*
* The ManaPlus Client
* Copyright (C) 2004-2009 The Mana World Development Team
* Copyright (C) 2009-2010 The Mana Developers
* Copyright (C) 2011-2014 The ManaPlus Developers
*
* This file is part of The ManaPlus 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 "utils/stringutils.h"
#include "logger.h"
#include "debug.h"
#define MAKEWORD(low, high) \
(static_cast<uint16_t>((static_cast<unsigned char>(low)) | \
(static_cast<uint16_t>(static_cast<unsigned char>(high))) << 8))
namespace Net
{
MessageIn::MessageIn(const char *const data, const unsigned int length):
mData(data),
mLength(length),
mId(0),
mPos(0)
{
PacketCounters::incInPackets();
DEBUGLOG("MessageIn");
}
unsigned char MessageIn::readInt8()
{
unsigned char value = static_cast<unsigned char>(-1);
if (mPos < mLength)
value = static_cast<unsigned char>(mData[mPos]);
mPos += 1;
PacketCounters::incInBytes(1);
DEBUGLOG("readInt8: " + toStringPrint(static_cast<int>(value)));
return value;
}
void MessageIn::readCoordinates(uint16_t &restrict x, uint16_t &restrict y)
{
if (mPos + 3 <= mLength)
{
const unsigned char *const p
= reinterpret_cast<unsigned char const *const>(mData + mPos);
x = static_cast<uint16_t>(p[0] | ((p[1] & 0x07) << 8));
y = static_cast<uint16_t>((p[1] >> 3) | ((p[2] & 0x3F) << 5));
}
mPos += 3;
PacketCounters::incInBytes(3);
DEBUGLOG(std::string("readCoordinates: ").append(toString(
static_cast<int>(x))).append(",").append(toString(
static_cast<int>(y))));
}
uint8_t MessageIn::fromServerDirection(const uint8_t serverDir)
{
// Translate from eAthena format
switch (serverDir)
{
case 0:
return 1;
case 1:
return 3;
case 2:
return 2;
case 3:
return 6;
case 4:
return 4;
case 5:
return 12;
case 6:
return 8;
case 7:
return 9;
case 8:
return 8;
default:
logger->log("incorrect direction: %d",
static_cast<int>(serverDir));
return 0;
}
}
void MessageIn::readCoordinates(uint16_t &restrict x, uint16_t &restrict y,
uint8_t &restrict direction)
{
uint8_t serverDir = 0;
if (mPos + 3 <= mLength)
{
const char *const data = mData + mPos;
uint16_t temp = MAKEWORD(data[1] & 0x00c0, data[0] & 0x00ff);
x = static_cast<uint16_t>(temp >> 6);
temp = MAKEWORD(data[2] & 0x00f0, data[1] & 0x003f);
y = static_cast<uint16_t>(temp >> 4);
serverDir = static_cast<uint8_t>(data[2] & 0x000f);
direction = fromServerDirection(serverDir);
DEBUGLOG(std::string("readCoordinates: ").append(toString(
static_cast<int>(x))).append(",").append(toString(
static_cast<int>(y))).append(",").append(toString(
static_cast<int>(serverDir))));
}
else
{
x = 0;
y = 0;
direction = 0;
logger->log("error: wrong readCoordinates packet");
}
mPos += 3;
PacketCounters::incInBytes(3);
}
void MessageIn::readCoordinatePair(uint16_t &restrict srcX,
uint16_t &restrict srcY,
uint16_t &restrict dstX,
uint16_t &restrict dstY)
{
if (mPos + 5 <= mLength)
{
const char *const data = mData + mPos;
uint16_t temp = MAKEWORD(data[3], data[2] & 0x000f);
dstX = static_cast<uint16_t>(temp >> 2);
dstY = MAKEWORD(data[4], data[3] & 0x0003);
temp = MAKEWORD(data[1], data[0]);
srcX = static_cast<uint16_t>(temp >> 6);
temp = MAKEWORD(data[2], data[1] & 0x003f);
srcY = static_cast<uint16_t>(temp >> 4);
DEBUGLOG(std::string("readCoordinatePair: ").append(toString(
static_cast<int>(srcX))).append(",").append(toString(
static_cast<int>(srcY))).append(" ").append(toString(
static_cast<int>(dstX))).append(",").append(toString(
static_cast<int>(dstY))));
}
else
{
srcX = 0;
srcY = 0;
dstX = 0;
dstY = 0;
logger->log("error: wrong readCoordinatePair packet");
}
mPos += 5;
PacketCounters::incInBytes(5);
}
void MessageIn::skip(const unsigned int length)
{
mPos += length;
PacketCounters::incInBytes(length);
DEBUGLOG("skip: " + toString(static_cast<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
const char *const stringBeg = mData + mPos;
const char *const stringEnd
= static_cast<const char *const>(memchr(stringBeg, '\0', length));
const std::string str(stringBeg, stringEnd
? stringEnd - stringBeg : length);
mPos += length;
PacketCounters::incInBytes(length);
DEBUGLOG("readString: " + str);
return str;
}
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
const char *const stringBeg = mData + mPos;
const char *const stringEnd
= static_cast<const char *const>(memchr(stringBeg, '\0', length));
std::string str(stringBeg, stringEnd
? stringEnd - stringBeg : length);
mPos += length;
PacketCounters::incInBytes(length);
DEBUGLOG("readString: " + str);
if (stringEnd)
{
const size_t len2 = length - (stringEnd - stringBeg) - 1;
const char *const stringBeg2 = stringEnd + 1;
const char *const stringEnd2
= static_cast<const char *const>(memchr(stringBeg2, '\0', len2));
const std::string hiddenPart = std::string(stringBeg2,
stringEnd2 ? stringEnd2 - stringBeg2 : len2);
if (hiddenPart.length() > 0)
{
DEBUGLOG("readString2: " + hiddenPart);
return str.append("|").append(hiddenPart);
}
}
return str;
}
unsigned char *MessageIn::readBytes(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("readBytesString error");
return nullptr;
}
unsigned char *const buf = new unsigned char[length + 2];
memcpy(buf, mData + mPos, length);
buf[length] = 0;
buf[length + 1] = 0;
mPos += length;
#ifdef ENABLEDEBUGLOG
std::string str;
for (int f = 0; f < length; f ++)
str.append(strprintf("%02x", static_cast<unsigned>(buf[f])));
str += " ";
for (int f = 0; f < length; f ++)
{
if (buf[f])
str.append(strprintf("%c", buf[f]));
else
str.append("_");
}
logger->dlog("ReadBytes: " + str);
#endif
PacketCounters::incInBytes(length);
return buf;
}
} // namespace Net