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
|
// This file is part of par2cmdline (a PAR 2.0 compatible file verification and
// repair tool). See http://parchive.sourceforge.net for details of PAR 2.0.
//
// Copyright (c) 2003 Peter Brian Clements
//
// par2cmdline 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.
//
// par2cmdline 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
#include "par2cmdline.h"
#ifdef _MSC_VER
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
#endif
// Construct the creator packet.
// The only external information required to complete construction is
// the set_id_hash (which is normally computed from information in the
// main packet).
bool CreatorPacket::Create(const MD5Hash &setid)
{
string creator = "Created by " PACKAGE " version " VERSION ".";
// Allocate a packet just large enough for creator name
CREATORPACKET *packet = (CREATORPACKET *)AllocatePacket(sizeof(*packet) + (~3 & (3+(u32)creator.size())));
// Fill in the details the we know
packet->header.magic = packet_magic;
packet->header.length = packetlength;
//packet->header.hash; // Compute shortly
packet->header.setid = setid;
packet->header.type = creatorpacket_type;
// Copy the creator description into the packet
memcpy(packet->client, creator.c_str(), creator.size());
// Compute the packet hash
MD5Context packetcontext;
packetcontext.Update(&packet->header.setid, packetlength - offsetof(PACKET_HEADER, setid));
packetcontext.Final(packet->header.hash);
return true;
}
// Load the packet from disk.
bool CreatorPacket::Load(DiskFile *diskfile, u64 offset, PACKET_HEADER &header)
{
// Is the packet long enough
if (header.length <= sizeof(CREATORPACKET))
{
return false;
}
// Is the packet too large (what is the longest reasonable creator description)
if (header.length - sizeof(CREATORPACKET) > 100000)
{
return false;
}
// Allocate the packet (with a little extra so we will have NULLs after the description)
CREATORPACKET *packet = (CREATORPACKET *)AllocatePacket((size_t)header.length, 4);
packet->header = header;
// Load the rest of the packet from disk
return diskfile->Read(offset + sizeof(PACKET_HEADER),
packet->client,
(size_t)packet->header.length - sizeof(PACKET_HEADER));
}
|
