00001 /* 00002 00003 Copyright (c) 2006, Arvid Norberg 00004 All rights reserved. 00005 00006 Redistribution and use in source and binary forms, with or without 00007 modification, are permitted provided that the following conditions 00008 are met: 00009 00010 * Redistributions of source code must retain the above copyright 00011 notice, this list of conditions and the following disclaimer. 00012 * Redistributions in binary form must reproduce the above copyright 00013 notice, this list of conditions and the following disclaimer in 00014 the documentation and/or other materials provided with the distribution. 00015 * Neither the name of the author nor the names of its 00016 contributors may be used to endorse or promote products derived 00017 from this software without specific prior written permission. 00018 00019 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 00020 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00021 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00022 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 00023 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 00024 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 00025 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00026 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00027 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 00028 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00029 POSSIBILITY OF SUCH DAMAGE. 00030 00031 */ 00032 00033 #ifndef PACKET_ITERATOR_HPP 00034 #define PACKET_ITERATOR_HPP 00035 00036 #include <boost/iterator/iterator_facade.hpp> 00037 #include <vector> 00038 #include <stdexcept> 00039 00040 namespace libtorrent { namespace dht 00041 { 00042 00043 class packet_iterator: public boost::iterator_facade< 00044 packet_iterator, const char, boost::forward_traversal_tag> 00045 { 00046 public: 00047 typedef std::vector<char>::const_iterator base_iterator; 00048 00049 packet_iterator() {} 00050 00051 packet_iterator(std::vector<char>::const_iterator start 00052 , std::vector<char>::const_iterator end 00053 , std::string const& error_msg = "") 00054 : m_base(start) 00055 , m_end(end) 00056 , m_msg(error_msg) 00057 {} 00058 00059 base_iterator base() const 00060 { return m_base; } 00061 00062 base_iterator end() const 00063 { return m_end; } 00064 00065 int left() const { return int(m_end - m_base); } 00066 00067 private: 00068 friend class boost::iterator_core_access; 00069 00070 bool equal(packet_iterator const& other) const 00071 { return m_base == other.m_base; } 00072 00073 void advance(int n) 00074 { 00075 m_base += n; 00076 } 00077 00078 void increment() 00079 { ++m_base; } 00080 00081 char const& dereference() const 00082 { 00083 if (m_base == m_end) throw std::runtime_error(m_msg); 00084 return *m_base; 00085 } 00086 00087 base_iterator m_base; 00088 base_iterator m_end; 00089 std::string m_msg; 00090 }; 00091 00092 } } // namespace libtorrent::dht 00093 00094 #endif // PACKET_ITERATOR_HPP 00095
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