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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*
* The Mana World
* Copyright (C) 2004 The Mana World Development Team
*
* This file is part of The Mana World.
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "messagein.h"
#ifdef TMWSERV_SUPPORT
#include <enet/enet.h>
#else
#include <SDL.h>
#include <SDL_endian.h>
#endif
#include <cassert>
#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();
}
int MessageIn::readInt8()
{
int value = -1;
if (mPos < mLength)
{
value = (unsigned char) mData[mPos];
}
mPos += 1;
return value;
}
int MessageIn::readInt16()
{
int value = -1;
if (mPos + 2 <= mLength)
{
#ifdef TMWSERV_SUPPORT
uint16_t t;
memcpy(&t, mData + mPos, 2);
value = (unsigned short) ENET_NET_TO_HOST_16(t);
#else
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
value = SDL_Swap16(*(Sint16*)(mData + mPos));
#else
value = (*(Sint16*)(mData + mPos));
#endif
#endif // TMWSERV_SUPPORT
}
mPos += 2;
return value;
}
int MessageIn::readInt32()
{
int value = -1;
if (mPos + 4 <= mLength)
{
#ifdef TMWSERV_SUPPORT
uint32_t t;
memcpy(&t, mData + mPos, 4);
value = ENET_NET_TO_HOST_32(t);
#else
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
value = SDL_Swap32(*(Sint32*)(mData + mPos));
#else
value = (*(Sint32*)(mData + mPos));
#endif
#endif // TMWSERV_SUPPORT
}
mPos += 4;
return value;
}
void MessageIn::readCoordinates(Uint16 &x, Uint16 &y)
{
if (mPos + 3 <= mLength)
{
unsigned char const *p = reinterpret_cast< unsigned char const * >(mData + mPos);
x = p[0] | ((p[1] & 0x07) << 8);
y = (p[1] >> 3) | ((p[2] & 0x3F) << 5);
}
mPos += 3;
}
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;
}
|
