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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
*
* $Id$
*/
#include "messagein.h"
#include <cassert>
#include <SDL.h>
#include <SDL_endian.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 = readShort();
}
char
MessageIn::readByte()
{
assert(mPos < mLength);
return mData[mPos++];
}
short
MessageIn::readShort()
{
assert(mPos + 2 <= mLength);
mPos += 2;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
return SDL_Swap16(*(short*)(mData + (mPos - 2)));
#else
return (*(short*)(mData + (mPos - 2)));
#endif
}
long
MessageIn::readLong()
{
assert(mPos + 4 <= mLength);
mPos += 4;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
return SDL_Swap32(*(long*)(mData + (mPos - 4)));
#else
return (*(long*)(mData + (mPos - 4)));
#endif
}
void
MessageIn::readCoordinates(unsigned short &x,
unsigned short &y,
unsigned char &direction)
{
assert(mPos + 3 <= mLength);
const char *data = mData + mPos;
short 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;
mPos += 3;
}
void
MessageIn::readCoordinatePair(unsigned short &srcX, unsigned short &srcY,
unsigned short &dstX, unsigned short &dstY)
{
assert(mPos + 5 <= mLength);
const char *data = mData + mPos;
short 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)
{
int stringLength = 0;
std::string readString = "";
// Get string length
if (length < 0) {
stringLength = readShort();
} else {
stringLength = length;
}
// Make sure there is enough data available
assert(mPos + length <= mLength);
// Read the string
char *tmpString = new char[stringLength + 1];
memcpy(tmpString, (void*)&mData[mPos], stringLength);
tmpString[stringLength] = 0;
mPos += stringLength;
readString = tmpString;
delete tmpString;
return readString;
}
char& operator<<(char &lhs, MessageIn &msg)
{
lhs = msg.readByte();
return lhs;
}
short& operator<<(short &lhs, MessageIn &msg)
{
lhs = msg.readShort();
return lhs;
}
long& operator<<(long &lhs, MessageIn &msg)
{
lhs = msg.readLong();
return lhs;
}
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