292 lines
7.5 KiB
C++
292 lines
7.5 KiB
C++
/*
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Copyright (c) 2003-2012, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_LAZY_ENTRY_HPP_INCLUDED
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#define TORRENT_LAZY_ENTRY_HPP_INCLUDED
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#include <utility>
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#include <vector>
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#include <string>
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#include <cstring>
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#include "libtorrent/config.hpp"
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#include "libtorrent/assert.hpp"
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#include "libtorrent/size_type.hpp"
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#include "libtorrent/error_code.hpp"
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#if TORRENT_USE_IOSTREAM
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#include <iosfwd>
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#endif
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namespace libtorrent
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{
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struct lazy_entry;
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TORRENT_EXPORT char const* parse_int(char const* start, char const* end
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, char delimiter, boost::int64_t& val);
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// return 0 = success
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TORRENT_EXPORT int lazy_bdecode(char const* start, char const* end
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, lazy_entry& ret, error_code& ec, int* error_pos = 0
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, int depth_limit = 1000, int item_limit = 1000000);
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#ifndef TORRENT_NO_DEPRECATE
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// for backwards compatibility, does not report error code
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// deprecated in 0.16
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TORRENT_DEPRECATED_PREFIX
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TORRENT_EXPORT int lazy_bdecode(char const* start, char const* end
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, lazy_entry& ret, int depth_limit = 1000, int item_limit = 1000000) TORRENT_DEPRECATED;
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#endif
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struct pascal_string
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{
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pascal_string(char const* p, int l): len(l), ptr(p) {}
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int len;
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char const* ptr;
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bool operator<(pascal_string const& rhs) const
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{
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return std::memcmp(ptr, rhs.ptr, (std::min)(len, rhs.len)) < 0
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|| len < rhs.len;
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}
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};
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struct lazy_dict_entry;
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struct TORRENT_EXPORT lazy_entry
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{
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enum entry_type_t
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{
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none_t, dict_t, list_t, string_t, int_t
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};
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lazy_entry() : m_begin(0), m_len(0), m_size(0), m_capacity(0), m_type(none_t)
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{ m_data.start = 0; }
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entry_type_t type() const { return (entry_type_t)m_type; }
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// start points to the first decimal digit
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// length is the number of digits
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void construct_int(char const* start, int length)
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{
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TORRENT_ASSERT(m_type == none_t);
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m_type = int_t;
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m_data.start = start;
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m_size = length;
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m_begin = start - 1; // include 'i'
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m_len = length + 2; // include 'e'
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}
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size_type int_value() const;
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// string functions
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// ================
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void construct_string(char const* start, int length);
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// the string is not null-terminated!
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char const* string_ptr() const
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{
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TORRENT_ASSERT(m_type == string_t);
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return m_data.start;
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}
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// this will return a null terminated string
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// it will write to the source buffer!
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char const* string_cstr() const
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{
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TORRENT_ASSERT(m_type == string_t);
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const_cast<char*>(m_data.start)[m_size] = 0;
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return m_data.start;
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}
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pascal_string string_pstr() const
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{
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TORRENT_ASSERT(m_type == string_t);
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return pascal_string(m_data.start, m_size);
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}
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std::string string_value() const
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{
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TORRENT_ASSERT(m_type == string_t);
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return std::string(m_data.start, m_size);
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}
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int string_length() const
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{ return m_size; }
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// dictionary functions
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// ====================
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void construct_dict(char const* begin)
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{
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TORRENT_ASSERT(m_type == none_t);
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m_type = dict_t;
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m_size = 0;
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m_capacity = 0;
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m_begin = begin;
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}
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lazy_entry* dict_append(char const* name);
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void pop();
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lazy_entry* dict_find(char const* name);
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lazy_entry const* dict_find(char const* name) const
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{ return const_cast<lazy_entry*>(this)->dict_find(name); }
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std::string dict_find_string_value(char const* name) const;
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pascal_string dict_find_pstr(char const* name) const;
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size_type dict_find_int_value(char const* name, size_type default_val = 0) const;
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lazy_entry const* dict_find_dict(char const* name) const;
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lazy_entry const* dict_find_list(char const* name) const;
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lazy_entry const* dict_find_string(char const* name) const;
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lazy_entry const* dict_find_int(char const* name) const;
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std::pair<std::string, lazy_entry const*> dict_at(int i) const;
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int dict_size() const
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{
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TORRENT_ASSERT(m_type == dict_t);
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return m_size;
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}
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// list functions
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// ==============
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void construct_list(char const* begin)
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{
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TORRENT_ASSERT(m_type == none_t);
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m_type = list_t;
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m_size = 0;
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m_capacity = 0;
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m_begin = begin;
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}
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lazy_entry* list_append();
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lazy_entry* list_at(int i)
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{
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TORRENT_ASSERT(m_type == list_t);
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TORRENT_ASSERT(i < int(m_size));
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return &m_data.list[i];
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}
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lazy_entry const* list_at(int i) const
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{ return const_cast<lazy_entry*>(this)->list_at(i); }
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std::string list_string_value_at(int i) const;
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pascal_string list_pstr_at(int i) const;
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size_type list_int_value_at(int i, size_type default_val = 0) const;
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int list_size() const
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{
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TORRENT_ASSERT(m_type == list_t);
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return int(m_size);
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}
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// end points one byte passed last byte
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void set_end(char const* end)
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{
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TORRENT_ASSERT(end > m_begin);
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m_len = end - m_begin;
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}
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void clear();
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// releases ownership of any memory allocated
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void release()
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{
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m_data.start = 0;
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m_size = 0;
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m_capacity = 0;
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m_type = none_t;
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}
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~lazy_entry()
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{ clear(); }
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// returns pointers into the source buffer where
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// this entry has its bencoded data
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std::pair<char const*, int> data_section() const;
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void swap(lazy_entry& e)
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{
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using std::swap;
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boost::uint32_t tmp = e.m_type;
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e.m_type = m_type;
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m_type = tmp;
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tmp = e.m_capacity;
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e.m_capacity = m_capacity;
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m_capacity = tmp;
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swap(m_data.start, e.m_data.start);
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swap(m_size, e.m_size);
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swap(m_begin, e.m_begin);
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swap(m_len, e.m_len);
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}
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private:
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union data_t
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{
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lazy_dict_entry* dict;
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lazy_entry* list;
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char const* start;
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} m_data;
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// used for dictionaries and lists to record the range
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// in the original buffer they are based on
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char const* m_begin;
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// the number of bytes this entry extends in the
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// bencoded byffer
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boost::uint32_t m_len;
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// if list or dictionary, the number of items
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boost::uint32_t m_size;
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// if list or dictionary, allocated number of items
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boost::uint32_t m_capacity:29;
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// element type (dict, list, int, string)
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boost::uint32_t m_type:3;
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// non-copyable
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lazy_entry(lazy_entry const&);
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lazy_entry const& operator=(lazy_entry const&);
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};
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struct lazy_dict_entry
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{
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char const* name;
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lazy_entry val;
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};
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TORRENT_EXPORT std::string print_entry(lazy_entry const& e
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, bool single_line = false, int indent = 0);
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}
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#endif
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