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-rw-r--r--src/bencode.cc242
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diff --git a/src/bencode.cc b/src/bencode.cc
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-/* <!-- 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 "bencode.h"
-
-#include <fstream>
-#include <sstream>
-
-#include "StringFormat.h"
-#include "DlAbortEx.h"
-
-namespace aria2 {
-
-namespace bencode {
-
-static BDE decodeiter(std::istream& ss, size_t depth);
-
-static void checkdelim(std::istream& ss, const char delim = ':')
-{
- char d;
- if(!(ss.get(d) && d == delim)) {
- throw DL_ABORT_EX
- (StringFormat("Bencode decoding failed: Delimiter '%c' not found.",
- delim).str());
- }
-}
-
-static std::string decoderawstring(std::istream& ss)
-{
- int length;
- ss >> length;
- if(!ss || length < 0) {
- throw DL_ABORT_EX("Bencode decoding failed:"
- " A positive integer expected but none found.");
- }
- // TODO check length, it must be less than or equal to INT_MAX
- checkdelim(ss);
- char* buf = new char[length];
- ss.read(buf, length);
- std::string str(&buf[0], &buf[length]);
- delete [] buf;
- if(ss.gcount() != static_cast<int>(length)) {
- throw DL_ABORT_EX
- (StringFormat("Bencode decoding failed:"
- " Expected %lu bytes of data, but only %d read.",
- static_cast<unsigned long>(length), ss.gcount()).str());
- }
- return str;
-}
-
-static BDE decodestring(std::istream& ss)
-{
- return BDE(decoderawstring(ss));
-}
-
-static BDE decodeinteger(std::istream& ss)
-{
- BDE::Integer integer;
- ss >> integer;
- if(!ss) {
- throw DL_ABORT_EX("Bencode decoding failed:"
- " Integer expected but none found");
- }
- checkdelim(ss, 'e');
- return BDE(integer);
-}
-
-static BDE decodedict(std::istream& ss, size_t depth)
-{
- BDE dict = BDE::dict();
- char c;
- while(ss.get(c)) {
- if(c == 'e') {
- return dict;
- } else {
- ss.unget();
- std::string key = decoderawstring(ss);
- dict[key] = decodeiter(ss, depth);
- }
- }
- throw DL_ABORT_EX("Bencode decoding failed:"
- " Unexpected EOF in dict context. 'e' expected.");
-}
-
-static BDE decodelist(std::istream& ss, size_t depth)
-{
- BDE list = BDE::list();
- char c;
- while(ss.get(c)) {
- if(c == 'e') {
- return list;
- } else {
- ss.unget();
- list << decodeiter(ss, depth);
- }
- }
- throw DL_ABORT_EX("Bencode decoding failed:"
- " Unexpected EOF in list context. 'e' expected.");
-}
-
-static void checkDepth(size_t depth)
-{
- if(depth >= MAX_STRUCTURE_DEPTH) {
- throw DL_ABORT_EX("Bencode decoding failed: Structure is too deep.");
- }
-}
-
-static BDE decodeiter(std::istream& ss, size_t depth)
-{
- checkDepth(depth);
- char c;
- if(!ss.get(c)) {
- throw DL_ABORT_EX("Bencode decoding failed:"
- " Unexpected EOF in term context."
- " 'd', 'l', 'i' or digit is expected.");
- }
- if(c == 'd') {
- return decodedict(ss, depth+1);
- } else if(c == 'l') {
- return decodelist(ss, depth+1);
- } else if(c == 'i') {
- return decodeinteger(ss);
- } else {
- ss.unget();
- return decodestring(ss);
- }
-}
-
-BDE decode(std::istream& in)
-{
- return decodeiter(in, 0);
-}
-
-BDE decode(const std::string& s)
-{
- size_t end;
- return decode(s, end);
-}
-
-BDE decode(const std::string& s, size_t& end)
-{
- if(s.empty()) {
- return BDE::none;
- }
- std::istringstream ss(s);
-
- BDE bde = decodeiter(ss, 0);
- end = ss.tellg();
- return bde;
-}
-
-BDE decode(const unsigned char* data, size_t length)
-{
- return decode(std::string(&data[0], &data[length]));
-}
-
-BDE decode(const unsigned char* data, size_t length, size_t& end)
-{
- return decode(std::string(&data[0], &data[length]), end);
-}
-
-BDE decodeFromFile(const std::string& filename)
-{
- std::ifstream f(filename.c_str(), std::ios::binary);
- if(f) {
- return decode(f);
- } else {
- throw DL_ABORT_EX
- (StringFormat("Bencode decoding failed:"
- " Cannot open file '%s'.", filename.c_str()).str());
- }
-}
-
-static void encodeIter(std::ostream& o, const BDE& bde)
-{
- if(bde.isInteger()) {
- o << "i" << bde.i() << "e";
- } else if(bde.isString()) {
- const std::string& s = bde.s();
- o << s.size() << ":";
- o.write(s.data(), s.size());
- } else if(bde.isDict()) {
- o << "d";
- for(BDE::Dict::const_iterator i = bde.dictBegin(), eoi = bde.dictEnd();
- i != eoi; ++i){
- const std::string& key = (*i).first;
- o << key.size() << ":";
- o.write(key.data(), key.size());
- encodeIter(o, (*i).second);
- }
- o << "e";
- } else if(bde.isList()) {
- o << "l";
- for(BDE::List::const_iterator i = bde.listBegin(), eoi = bde.listEnd();
- i != eoi; ++i){
- encodeIter(o, *i);
- }
- o << "e";
- }
-}
-
-std::string encode(const BDE& bde)
-{
- std::ostringstream ss;
- encodeIter(ss, bde);
- return ss.str();
-}
-
-} // namespace bencode
-
-} // namespace aria2
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