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/*
* The Mana World
* Copyright 2004 The Mana World Development Team
*
* This file is part of The Mana World.
*
* The Mana World 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 World 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 World; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <cassert>
#include <SDL.h>
#include <SDL_endian.h>
#include "messagein.h"
#define MAKEWORD(low,high) \
((unsigned short)(((unsigned char)(low)) | \
((unsigned short)((unsigned char)(high))) << 8))
MessageIn::MessageIn(const char *data, unsigned int length):
mData(data),
mLength(length),
mPos(0)
{
// Read the message ID
mId = readInt16();
}
Sint8 MessageIn::readInt8()
{
assert(mPos < mLength);
return mData[mPos++];
}
Sint16 MessageIn::readInt16()
{
assert(mPos + 2 <= mLength);
mPos += 2;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
return SDL_Swap16(*(Sint16*)(mData + (mPos - 2)));
#else
return (*(Sint16*)(mData + (mPos - 2)));
#endif
}
Sint32 MessageIn::readInt32()
{
assert(mPos + 4 <= mLength);
mPos += 4;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
return SDL_Swap32(*(Sint32*)(mData + (mPos - 4)));
#else
return (*(Sint32*)(mData + (mPos - 4)));
#endif
}
void MessageIn::readCoordinates(Uint16 &x, Uint16 &y, Uint8 &direction)
{
assert(mPos + 3 <= mLength);
const char *data = mData + mPos;
Sint16 temp;
temp = MAKEWORD(data[1] & 0x00c0, data[0] & 0x00ff);
x = temp >> 6;
temp = MAKEWORD(data[2] & 0x00f0, data[1] & 0x003f);
y = 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;
}
void MessageIn::readCoordinatePair(Uint16 &srcX, Uint16 &srcY,
Uint16 &dstX, Uint16 &dstY)
{
assert(mPos + 5 <= mLength);
const char *data = mData + mPos;
Sint16 temp;
temp = MAKEWORD(data[3], data[2] & 0x000f);
dstX = temp >> 2;
dstY = MAKEWORD(data[4], data[3] & 0x0003);
temp = MAKEWORD(data[1], data[0]);
srcX = temp >> 6;
temp = MAKEWORD(data[2], data[1] & 0x003f);
srcY = temp >> 4;
mPos += 5;
}
void MessageIn::skip(unsigned int length)
{
assert(mPos + length <= mLength);
mPos += 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;
return "";
}
// Read the string
char const *stringBeg = mData + mPos;
char const *stringEnd = (char const *)memchr(stringBeg, '\0', length);
std::string readString(stringBeg,
stringEnd ? stringEnd - stringBeg : length);
mPos += length;
return readString;
}
Sint8& operator<<(Sint8 &lhs, MessageIn &msg)
{
lhs = msg.readInt8();
return lhs;
}
Sint16& operator<<(Sint16 &lhs, MessageIn &msg)
{
lhs = msg.readInt16();
return lhs;
}
Sint32& operator<<(Sint32 &lhs, MessageIn &msg)
{
lhs = msg.readInt32();
return lhs;
}
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