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
|
/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* 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
* (at your option) 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#include "PeerMessageUtil.h"
#include "DlAbortEx.h"
#include "Util.h"
#include <netinet/in.h>
int8_t PeerMessageUtil::getId(const unsigned char* msg) {
return msg[0];
}
int32_t PeerMessageUtil::getIntParam(const unsigned char* msg, int32_t offset) {
int32_t nParam;
memcpy(&nParam, msg+offset, sizeof(int32_t));
return ntohl(nParam);
}
int16_t PeerMessageUtil::getShortIntParam(const unsigned char* msg, int32_t offset) {
int16_t nParam;
memcpy(&nParam, msg+offset, sizeof(int16_t));
return ntohs(nParam);
}
void PeerMessageUtil::checkIndex(int32_t index, int32_t pieces) {
if(!(0 <= index && index < (int32_t)pieces)) {
throw new DlAbortEx("Invalid index: %d", index);
}
}
void PeerMessageUtil::checkBegin(int32_t begin, int32_t pieceLength) {
if(!(0 <= begin && begin < (int32_t)pieceLength)) {
throw new DlAbortEx("Invalid begin: %d", begin);
}
}
void PeerMessageUtil::checkLength(int32_t length) {
if(length > MAX_BLOCK_LENGTH) {
throw new DlAbortEx("Length too long: %d > %dKB", length,
MAX_BLOCK_LENGTH/1024);
}
if(length <= 0) {
throw new DlAbortEx("Invalid length: %d", length);
}
if(!Util::isPowerOf(length, 2)) {
throw new DlAbortEx("Invalid length: %d It is not power of 2",
length);
}
}
void PeerMessageUtil::checkRange(int32_t begin, int32_t length, int32_t pieceLength) {
if(!(0 <= begin && 0 < length)) {
throw new DlAbortEx("Invalid range: begin=%d, length=%d",
begin, length);
}
int32_t end = begin+length;
if(!(0 < end && end <= pieceLength)) {
throw new DlAbortEx("Invalid range: begin=%d, length=%d",
begin, length);
}
}
void PeerMessageUtil::checkBitfield(const unsigned char* bitfield,
int32_t bitfieldLength,
int32_t pieces) {
if(!(bitfieldLength == BITFIELD_LEN_FROM_PIECES(pieces))) {
throw new DlAbortEx("Invalid bitfield length: %d",
bitfieldLength);
}
char lastbyte = bitfield[bitfieldLength-1];
for(int32_t i = 0; i < 8-pieces%8 && pieces%8 != 0; ++i) {
if(!(((lastbyte >> i) & 1) == 0)) {
throw new DlAbortEx("Invalid bitfield");
}
}
}
void PeerMessageUtil::setIntParam(unsigned char* dest, int32_t param) {
int32_t nParam = htonl(param);
memcpy(dest, &nParam, sizeof(int32_t));
}
void PeerMessageUtil::setShortIntParam(unsigned char* dest, int16_t param) {
int16_t nParam = htons(param);
memcpy(dest, &nParam, sizeof(int16_t));
}
void PeerMessageUtil::createPeerMessageString(unsigned char* msg,
int32_t msgLength,
int32_t payloadLength,
int8_t messageId) {
assert(msgLength >= 5);
memset(msg, 0, msgLength);
setIntParam(msg, payloadLength);
msg[4] = messageId;
}
|
