1 /*
2  * Copyright (C) 2001-2012 Jacek Sieka, arnetheduck on gmail point com
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17  */
18 
19 #pragma once
20 
21 #include "Encoder.h"
22 #include "Util.h"
23 #include <functional>
24 #include <algorithm>
25 
26 namespace dcpp {
27 
28 class CID {
29 public:
30     enum { SIZE = 192 / 8 };
31 
CID()32     CID() { memset(cid, 0, sizeof(cid)); }
CID(const uint8_t * data)33     explicit CID(const uint8_t* data) { memcpy(cid, data, sizeof(cid)); }
CID(const string & base32)34     explicit CID(const string& base32) { Encoder::fromBase32(base32.c_str(), cid, sizeof(cid)); }
35 
36     bool operator==(const CID& rhs) const { return memcmp(cid, rhs.cid, sizeof(cid)) == 0; }
37     bool operator<(const CID& rhs) const { return memcmp(cid, rhs.cid, sizeof(cid)) < 0; }
38 
toBase32()39     string toBase32() const { return Encoder::toBase32(cid, sizeof(cid)); }
toBase32(string & tmp)40     string& toBase32(string& tmp) const { return Encoder::toBase32(cid, sizeof(cid), tmp); }
41 
toHash()42     size_t toHash() const {
43         // RVO should handle this as efficiently as reinterpret_cast version
44         size_t cidHash;
45         memcpy(&cidHash, cid, sizeof(size_t));
46         return cidHash;
47     }
data()48     const uint8_t* data() const { return cid; }
49 
isZero()50     bool isZero() const { return std::find_if(cid, cid+SIZE, bind2nd(std::not_equal_to<uint8_t>(), 0)) == (cid+SIZE); }
51 
52     static CID generate();
53 
54 private:
55     uint8_t cid[SIZE];
56 };
57 
58 } // namespace dcpp
59 
60 namespace std {
61 template<>
62 struct hash<dcpp::CID> {
63     size_t operator()(const dcpp::CID& rhs) const {
64         size_t hvHash;
65         memcpy(&hvHash, rhs.data(), sizeof(size_t));
66         return hvHash;
67     }
68 };
69 
70 } // namespace dcpp
71