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/*
* The Mana Client
* Copyright (C) 2004-2009 The Mana World Development Team
* Copyright (C) 2009-2012 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/tmwa/messageout.h"
#include "net/tmwa/network.h"
#include <SDL.h>
#include <SDL_endian.h>
#include <cstring>
namespace TmwAthena {
MessageOut::MessageOut(uint16_t id):
mDataSize(0),
mPos(0)
{
mNetwork = TmwAthena::Network::instance();
mData = mNetwork->mOutBuffer + mNetwork->mOutSize;
writeInt16(id);
}
void MessageOut::expand(size_t bytes)
{
mNetwork->mOutSize += bytes;
}
void MessageOut::writeInt8(uint8_t value)
{
expand(1);
mData[mPos] = value;
mPos += 1;
}
void MessageOut::writeInt16(uint16_t value)
{
expand(2);
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
uint16_t swap = SDL_Swap16(value);
memcpy(mData + mPos, &swap, sizeof(uint16_t));
#else
memcpy(mData + mPos, &value, sizeof(uint16_t));
#endif
mPos += 2;
}
void MessageOut::writeInt32(uint32_t value)
{
expand(4);
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
uint32_t swap = SDL_Swap32(value);
memcpy(mData + mPos, &swap, sizeof(uint32_t));
#else
memcpy(mData + mPos, &value, sizeof(uint32_t));
#endif
mPos += 4;
}
void MessageOut::writeString(const std::string &string, int length)
{
int stringLength = string.length();
if (length < 0)
{
// Write the length at the start if not fixed
writeInt16(stringLength);
length = stringLength;
}
else if (length < stringLength)
{
// Make sure the length of the string is no longer than specified
stringLength = length;
}
expand(length);
// Write the actual string
memcpy(mData + mPos, string.data(), stringLength);
// Pad remaining space with zeros
if (length > stringLength)
{
memset(mData + mPos + stringLength, '\0', length - stringLength);
}
mPos += length;
}
void MessageOut::writeCoordinates(uint16_t x, uint16_t y, uint8_t direction)
{
char *data = mData + mPos;
expand(3);
mPos += 3;
uint16_t temp = x;
temp <<= 6;
data[0] = temp >> 8;
data[1] = temp;
temp = y;
temp <<= 4;
data[1] |= temp >> 8;
data[2] = temp;
// Translate direction to eAthena format
switch (direction)
{
case 1:
direction = 0;
break;
case 3:
direction = 1;
break;
case 2:
direction = 2;
break;
case 6:
direction = 3;
break;
case 4:
direction = 4;
break;
case 12:
direction = 5;
break;
case 8:
direction = 6;
break;
case 9:
direction = 7;
break;
default:
// OOPSIE! Impossible or unknown
direction = 15;
}
data[2] |= direction;
}
} // namespace TmwAthena
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