/* Copyright (c) 2003-2016, Arvid Norberg All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "libtorrent/config.hpp" #if TORRENT_USE_IOSTREAM #include #endif #ifndef TORRENT_NO_DEPRECATE #include "libtorrent/lazy_entry.hpp" #endif #include "libtorrent/bdecode.hpp" #include "libtorrent/entry.hpp" #include "libtorrent/hex.hpp" #include "libtorrent/string_util.hpp" #include "libtorrent/aux_/throw.hpp" namespace libtorrent { namespace detail { char const* integer_to_str(char* buf, int size , entry::integer_type val) { int sign = 0; if (val < 0) { sign = 1; val = -val; } buf[--size] = '\0'; if (val == 0) buf[--size] = '0'; for (; size > sign && val != 0;) { buf[--size] = '0' + char(val % 10); val /= 10; } if (sign) buf[--size] = '-'; return buf + size; } } namespace { inline void TORRENT_NO_RETURN throw_error() { aux::throw_ex(errors::invalid_entry_type); } template void call_destructor(T* o) { TORRENT_ASSERT(o); o->~T(); } } entry& entry::operator[](string_view key) { dictionary_type::iterator i = dict().find(key); if (i != dict().end()) return i->second; dictionary_type::iterator ret = dict().emplace( std::piecewise_construct, std::forward_as_tuple(key), std::forward_as_tuple()).first; return ret->second; } const entry& entry::operator[](string_view key) const { dictionary_type::const_iterator i = dict().find(key); if (i == dict().end()) throw_error(); return i->second; } entry* entry::find_key(string_view key) { dictionary_type::iterator i = dict().find(key); if (i == dict().end()) return nullptr; return &i->second; } entry const* entry::find_key(string_view key) const { dictionary_type::const_iterator i = dict().find(key); if (i == dict().end()) return nullptr; return &i->second; } entry::data_type entry::type() const { #if TORRENT_USE_ASSERTS m_type_queried = true; #endif return entry::data_type(m_type); } entry::~entry() { destruct(); } entry& entry::operator=(const entry& e) { if (&e == this) return *this; destruct(); copy(e); return *this; } entry& entry::operator=(entry&& e) noexcept { swap(e); return *this; } entry::integer_type& entry::integer() { if (m_type == undefined_t) construct(int_t); #ifdef BOOST_NO_EXCEPTIONS TORRENT_ASSERT(m_type_queried); #endif if (m_type != int_t) throw_error(); TORRENT_ASSERT(m_type == int_t); return *reinterpret_cast(&data); } entry::integer_type const& entry::integer() const { if (m_type != int_t) throw_error(); #ifdef BOOST_NO_EXCEPTIONS TORRENT_ASSERT(m_type_queried); #endif TORRENT_ASSERT(m_type == int_t); return *reinterpret_cast(&data); } entry::string_type& entry::string() { if (m_type == undefined_t) construct(string_t); #ifdef BOOST_NO_EXCEPTIONS TORRENT_ASSERT(m_type_queried); #endif if (m_type != string_t) throw_error(); TORRENT_ASSERT(m_type == string_t); return *reinterpret_cast(&data); } entry::string_type const& entry::string() const { if (m_type != string_t) throw_error(); #ifdef BOOST_NO_EXCEPTIONS TORRENT_ASSERT(m_type_queried); #endif TORRENT_ASSERT(m_type == string_t); return *reinterpret_cast(&data); } entry::list_type& entry::list() { if (m_type == undefined_t) construct(list_t); #ifdef BOOST_NO_EXCEPTIONS TORRENT_ASSERT(m_type_queried); #endif if (m_type != list_t) throw_error(); TORRENT_ASSERT(m_type == list_t); return *reinterpret_cast(&data); } entry::list_type const& entry::list() const { if (m_type != list_t) throw_error(); #ifdef BOOST_NO_EXCEPTIONS TORRENT_ASSERT(m_type_queried); #endif TORRENT_ASSERT(m_type == list_t); return *reinterpret_cast(&data); } entry::dictionary_type& entry::dict() { if (m_type == undefined_t) construct(dictionary_t); #ifdef BOOST_NO_EXCEPTIONS TORRENT_ASSERT(m_type_queried); #endif if (m_type != dictionary_t) throw_error(); TORRENT_ASSERT(m_type == dictionary_t); return *reinterpret_cast(&data); } entry::dictionary_type const& entry::dict() const { if (m_type != dictionary_t) throw_error(); #ifdef BOOST_NO_EXCEPTIONS TORRENT_ASSERT(m_type_queried); #endif TORRENT_ASSERT(m_type == dictionary_t); return *reinterpret_cast(&data); } entry::preformatted_type& entry::preformatted() { if (m_type == undefined_t) construct(preformatted_t); #ifdef BOOST_NO_EXCEPTIONS TORRENT_ASSERT(m_type_queried); #endif if (m_type != preformatted_t) throw_error(); TORRENT_ASSERT(m_type == preformatted_t); return *reinterpret_cast(&data); } entry::preformatted_type const& entry::preformatted() const { if (m_type != preformatted_t) throw_error(); #ifdef BOOST_NO_EXCEPTIONS TORRENT_ASSERT(m_type_queried); #endif TORRENT_ASSERT(m_type == preformatted_t); return *reinterpret_cast(&data); } entry::entry() : m_type(undefined_t) { #if TORRENT_USE_ASSERTS m_type_queried = true; #endif } entry::entry(data_type t) : m_type(undefined_t) { construct(t); #if TORRENT_USE_ASSERTS m_type_queried = true; #endif } entry::entry(const entry& e) : m_type(undefined_t) { copy(e); #if TORRENT_USE_ASSERTS m_type_queried = e.m_type_queried; #endif } entry::entry(entry&& e) noexcept : m_type(undefined_t) { #if TORRENT_USE_ASSERTS uint8_t type_queried = e.m_type_queried; #endif swap(e); #if TORRENT_USE_ASSERTS m_type_queried = type_queried; #endif } entry::entry(dictionary_type v) : m_type(undefined_t) { #if TORRENT_USE_ASSERTS m_type_queried = true; #endif new(&data) dictionary_type(std::move(v)); m_type = dictionary_t; } entry::entry(span v) : m_type(undefined_t) { #if TORRENT_USE_ASSERTS m_type_queried = true; #endif new(&data) string_type(v.data(), v.size()); m_type = string_t; } entry::entry(list_type v) : m_type(undefined_t) { #if TORRENT_USE_ASSERTS m_type_queried = true; #endif new(&data) list_type(std::move(v)); m_type = list_t; } entry::entry(integer_type v) : m_type(undefined_t) { #if TORRENT_USE_ASSERTS m_type_queried = true; #endif new(&data) integer_type(std::move(v)); m_type = int_t; } entry::entry(preformatted_type v) : m_type(undefined_t) { #if TORRENT_USE_ASSERTS m_type_queried = true; #endif new(&data) preformatted_type(std::move(v)); m_type = preformatted_t; } // convert a bdecode_node into an old skool entry entry& entry::operator=(bdecode_node const& e) { switch (e.type()) { case bdecode_node::string_t: this->string() = e.string_value().to_string(); break; case bdecode_node::int_t: this->integer() = e.int_value(); break; case bdecode_node::dict_t: { dictionary_type& d = this->dict(); for (int i = 0; i < e.dict_size(); ++i) { std::pair elem = e.dict_at(i); d[elem.first.to_string()] = elem.second; } break; } case bdecode_node::list_t: { list_type& l = this->list(); for (int i = 0; i < e.list_size(); ++i) { l.push_back(entry()); l.back() = e.list_at(i); } break; } case bdecode_node::none_t: destruct(); break; } return *this; } #ifndef TORRENT_NO_DEPRECATE // convert a lazy_entry into an old skool entry entry& entry::operator=(lazy_entry const& e) { switch (e.type()) { case lazy_entry::string_t: this->string() = e.string_value(); break; case lazy_entry::int_t: this->integer() = e.int_value(); break; case lazy_entry::dict_t: { dictionary_type& d = this->dict(); for (int i = 0; i < e.dict_size(); ++i) { std::pair elem = e.dict_at(i); d[elem.first] = *elem.second; } break; } case lazy_entry::list_t: { list_type& l = this->list(); for (int i = 0; i < e.list_size(); ++i) { l.push_back(entry()); l.back() = *e.list_at(i); } break; } case lazy_entry::none_t: destruct(); break; } return *this; } #endif entry& entry::operator=(preformatted_type v) { destruct(); new(&data) preformatted_type(std::move(v)); m_type = preformatted_t; #if TORRENT_USE_ASSERTS m_type_queried = true; #endif return *this; } entry& entry::operator=(dictionary_type v) { destruct(); new(&data) dictionary_type(std::move(v)); m_type = dictionary_t; #if TORRENT_USE_ASSERTS m_type_queried = true; #endif return *this; } entry& entry::operator=(span v) { destruct(); new(&data) string_type(v.data(), v.size()); m_type = string_t; #if TORRENT_USE_ASSERTS m_type_queried = true; #endif return *this; } entry& entry::operator=(list_type v) { destruct(); new(&data) list_type(std::move(v)); m_type = list_t; #if TORRENT_USE_ASSERTS m_type_queried = true; #endif return *this; } entry& entry::operator=(integer_type v) { destruct(); new(&data) integer_type(std::move(v)); m_type = int_t; #if TORRENT_USE_ASSERTS m_type_queried = true; #endif return *this; } bool entry::operator==(entry const& e) const { if (type() != e.type()) return false; switch (m_type) { case int_t: return integer() == e.integer(); case string_t: return string() == e.string(); case list_t: return list() == e.list(); case dictionary_t: return dict() == e.dict(); case preformatted_t: return preformatted() == e.preformatted(); default: TORRENT_ASSERT(m_type == undefined_t); return true; } } void entry::construct(data_type t) { switch (t) { case int_t: new (&data) integer_type; break; case string_t: new (&data) string_type; break; case list_t: new (&data) list_type; break; case dictionary_t: new (&data) dictionary_type; break; case undefined_t: break; case preformatted_t: new (&data) preformatted_type; break; } m_type = t; #if TORRENT_USE_ASSERTS m_type_queried = true; #endif } void entry::copy(entry const& e) { switch (e.type()) { case int_t: new (&data) integer_type(e.integer()); break; case string_t: new (&data) string_type(e.string()); break; case list_t: new (&data) list_type(e.list()); break; case dictionary_t: new (&data) dictionary_type(e.dict()); break; case undefined_t: TORRENT_ASSERT(e.type() == undefined_t); break; case preformatted_t: new (&data) preformatted_type(e.preformatted()); break; } m_type = e.type(); #if TORRENT_USE_ASSERTS m_type_queried = true; #endif } void entry::destruct() { switch(m_type) { case int_t: call_destructor(reinterpret_cast(&data)); break; case string_t: call_destructor(reinterpret_cast(&data)); break; case list_t: call_destructor(reinterpret_cast(&data)); break; case dictionary_t: call_destructor(reinterpret_cast(&data)); break; case preformatted_t: call_destructor(reinterpret_cast(&data)); break; default: TORRENT_ASSERT(m_type == undefined_t); break; } m_type = undefined_t; #if TORRENT_USE_ASSERTS m_type_queried = false; #endif } void entry::swap(entry& e) noexcept { bool clear_this = false; bool clear_that = false; if (m_type == undefined_t && e.m_type == undefined_t) return; if (m_type == undefined_t) { construct(data_type(e.m_type)); clear_that = true; } if (e.m_type == undefined_t) { e.construct(data_type(m_type)); clear_this = true; } if (m_type == e.m_type) { switch (m_type) { case int_t: std::swap(*reinterpret_cast(&data) , *reinterpret_cast(&e.data)); break; case string_t: std::swap(*reinterpret_cast(&data) , *reinterpret_cast(&e.data)); break; case list_t: std::swap(*reinterpret_cast(&data) , *reinterpret_cast(&e.data)); break; case dictionary_t: std::swap(*reinterpret_cast(&data) , *reinterpret_cast(&e.data)); break; case preformatted_t: std::swap(*reinterpret_cast(&data) , *reinterpret_cast(&e.data)); break; default: break; } if (clear_this) destruct(); if (clear_that) e.destruct(); } else { // currently, only swapping entries of the same type or where one // of the entries is uninitialized is supported. TORRENT_ASSERT_FAIL(); } } std::string entry::to_string() const { std::string ret; to_string_impl(ret, 0); return ret; } void entry::to_string_impl(std::string& out, int indent) const { TORRENT_ASSERT(indent >= 0); for (int i = 0; i < indent; ++i) out += ' '; switch (type()) { case int_t: out += libtorrent::to_string(integer()).data(); out += '\n'; break; case string_t: { bool binary_string = false; for (std::string::const_iterator i = string().begin(); i != string().end(); ++i) { if (!is_print(*i)) { binary_string = true; break; } } if (binary_string) { out += aux::to_hex(string()); out += '\n'; } else { out += string(); out += '\n'; } } break; case list_t: { out += "list\n"; for (list_type::const_iterator i = list().begin(); i != list().end(); ++i) { i->to_string_impl(out, indent + 1); } } break; case dictionary_t: { out += "dictionary\n"; for (dictionary_type::const_iterator i = dict().begin(); i != dict().end(); ++i) { bool binary_string = false; for (std::string::const_iterator k = i->first.begin(); k != i->first.end(); ++k) { if (!is_print(*k)) { binary_string = true; break; } } for (int j = 0; j < indent + 1; ++j) out += ' '; out += '['; if (binary_string) out += aux::to_hex(i->first); else out += i->first; out += ']'; if (i->second.type() != entry::string_t && i->second.type() != entry::int_t) out += '\n'; else out += ' '; i->second.to_string_impl(out, indent + 2); } } break; case preformatted_t: out += "\n"; break; case undefined_t: out += "\n"; } } }