1 /* <!-- copyright */
2 /*
3 * aria2 - The high speed download utility
4 *
5 * Copyright (C) 2010 Tatsuhiro Tsujikawa
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 *
21 * In addition, as a special exception, the copyright holders give
22 * permission to link the code of portions of this program with the
23 * OpenSSL library under certain conditions as described in each
24 * individual source file, and distribute linked combinations
25 * including the two.
26 * You must obey the GNU General Public License in all respects
27 * for all of the code used other than OpenSSL. If you modify
28 * file(s) with this exception, you may extend this exception to your
29 * version of the file(s), but you are not obligated to do so. If you
30 * do not wish to do so, delete this exception statement from your
31 * version. If you delete this exception statement from all source
32 * files in the program, then also delete it here.
33 */
34 /* copyright --> */
35 #include "bencode2.h"
36
37 #include <sstream>
38
39 #include "fmt.h"
40 #include "DlAbortEx.h"
41 #include "error_code.h"
42 #include "BufferedFile.h"
43 #include "util.h"
44 #include "ValueBaseBencodeParser.h"
45
46 namespace aria2 {
47
48 namespace bencode2 {
49
decode(const unsigned char * data,size_t len)50 std::unique_ptr<ValueBase> decode(const unsigned char* data, size_t len)
51 {
52 size_t end;
53 return decode(data, len, end);
54 }
55
decode(const std::string & data)56 std::unique_ptr<ValueBase> decode(const std::string& data)
57 {
58 size_t end;
59 return decode(reinterpret_cast<const unsigned char*>(data.c_str()),
60 data.size(), end);
61 }
62
decode(const unsigned char * data,size_t len,size_t & end)63 std::unique_ptr<ValueBase> decode(const unsigned char* data, size_t len,
64 size_t& end)
65 {
66 ssize_t error;
67 bittorrent::ValueBaseBencodeParser parser;
68 auto res = parser.parseFinal(reinterpret_cast<const char*>(data), len, error);
69 if (error < 0) {
70 throw DL_ABORT_EX2(
71 fmt("Bencode decoding failed: error=%d", static_cast<int>(error)),
72 error_code::BENCODE_PARSE_ERROR);
73 }
74 end = error;
75 return res;
76 }
77
encode(const ValueBase * vlb)78 std::string encode(const ValueBase* vlb)
79 {
80 class BencodeValueBaseVisitor : public ValueBaseVisitor {
81 private:
82 std::ostringstream out_;
83
84 public:
85 virtual void visit(const String& string) CXX11_OVERRIDE
86 {
87 const std::string& s = string.s();
88 out_ << s.size() << ":";
89 out_.write(s.data(), s.size());
90 }
91
92 virtual void visit(const Integer& integer) CXX11_OVERRIDE
93 {
94 out_ << "i" << integer.i() << "e";
95 }
96
97 virtual void visit(const Bool& v) CXX11_OVERRIDE {}
98 virtual void visit(const Null& v) CXX11_OVERRIDE {}
99
100 virtual void visit(const List& list) CXX11_OVERRIDE
101 {
102 out_ << "l";
103 for (const auto& e : list) {
104 e->accept(*this);
105 }
106 out_ << "e";
107 }
108
109 virtual void visit(const Dict& dict) CXX11_OVERRIDE
110 {
111 out_ << "d";
112 for (const auto& e : dict) {
113 auto& key = e.first;
114 out_ << key.size() << ":";
115 out_.write(key.data(), key.size());
116 e.second->accept(*this);
117 }
118 out_ << "e";
119 }
120
121 std::string getResult() const { return out_.str(); }
122 };
123 BencodeValueBaseVisitor visitor;
124 vlb->accept(visitor);
125 return visitor.getResult();
126 }
127
128 } // namespace bencode2
129
130 } // namespace aria2
131