summaryrefslogtreecommitdiff
path: root/src/net/tmwa/messageout.cpp
blob: 19f5ee4969b9f985c9920dd82c9ed3d718a6ac9c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/*
 *  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):
    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