forked from premiere/premiere-libtorrent
160 lines
4.9 KiB
C++
160 lines
4.9 KiB
C++
/*
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Copyright (c) 2016, 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_AUX_IO_HPP_INCLUDED
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#define TORRENT_AUX_IO_HPP_INCLUDED
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#include "libtorrent/aux_/disable_warnings_push.hpp"
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#include <boost/cstdint.hpp>
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#include "libtorrent/aux_/disable_warnings_pop.hpp"
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#include <string>
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#include <algorithm> // for copy
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#include "libtorrent/aux_/array_view.hpp"
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namespace libtorrent { namespace aux
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{
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template <class T> struct type {};
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// reads an integer from a byte stream
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// in big endian byte order and converts
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// it to native endianess
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template <class T, class Byte>
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inline typename std::enable_if<sizeof(Byte)==1, T>::type
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read_impl(array_view<Byte>& view, type<T>)
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{
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T ret = 0;
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for (int i = 0; i < int(sizeof(T)); ++i)
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{
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ret <<= 8;
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ret |= static_cast<boost::uint8_t>(view[i]);
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}
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view = view.cut_first(sizeof(T));
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return ret;
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}
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template <class T, class Byte>
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inline typename std::enable_if<sizeof(Byte)==1, void>::type
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write_impl(T val, array_view<Byte>& view)
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{
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int shift = int(sizeof(T)) * 8;
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for (int i = 0; i < int(sizeof(T)); ++i)
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{
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shift -= 8;
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view[i] = static_cast<unsigned char>((val >> shift) & 0xff);
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}
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view = view.cut_first(sizeof(T));
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}
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// -- adaptors
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template <typename Byte>
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boost::int64_t read_int64(array_view<Byte>& view)
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{ return read_impl(view, type<boost::int64_t>()); }
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template <typename Byte>
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boost::uint64_t read_uint64(array_view<Byte>& view)
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{ return read_impl(view, type<boost::uint64_t>()); }
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template <typename Byte>
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boost::uint32_t read_uint32(array_view<Byte>& view)
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{ return read_impl(view, type<boost::uint32_t>()); }
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template <typename Byte>
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boost::int32_t read_int32(array_view<Byte>& view)
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{ return read_impl(view, type<boost::int32_t>()); }
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template <typename Byte>
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boost::int16_t read_int16(array_view<Byte>& view)
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{ return read_impl(view, type<boost::int16_t>()); }
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template <typename Byte>
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boost::uint16_t read_uint16(array_view<Byte>& view)
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{ return read_impl(view, type<boost::uint16_t>()); }
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template <typename Byte>
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boost::int8_t read_int8(array_view<Byte>& view)
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{ return read_impl(view, type<boost::int8_t>()); }
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template <typename Byte>
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boost::uint8_t read_uint8(array_view<Byte>& view)
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{ return read_impl(view, type<boost::uint8_t>()); }
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template <typename Byte>
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void write_uint64(boost::uint64_t val, array_view<Byte>& view)
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{ write_impl(val, view); }
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template <typename Byte>
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void write_int64(boost::int64_t val, array_view<Byte>& view)
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{ write_impl(val, view); }
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template <typename Byte>
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void write_uint32(boost::uint32_t val, array_view<Byte>& view)
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{ write_impl(val, view); }
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template <typename Byte>
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void write_int32(boost::int32_t val, array_view<Byte>& view)
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{ write_impl(val, view); }
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template <typename Byte>
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void write_uint16(boost::uint16_t val, array_view<Byte>& view)
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{ write_impl(val, view); }
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template <typename Byte>
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void write_int16(boost::int16_t val, array_view<Byte>& view)
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{ write_impl(val, view); }
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template <typename Byte>
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void write_uint8(boost::uint8_t val, array_view<Byte>& view)
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{ write_impl(val, view); }
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template <typename Byte>
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void write_int8(boost::int8_t val, array_view<Byte>& view)
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{ write_impl(val, view); }
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template<typename Byte>
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inline int write_string(std::string const& str, array_view<Byte>& view)
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{
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int const len = int(str.size());
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for (int i = 0; i < len; ++i)
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view[i] = str[i];
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view = array_view<Byte>(view.data() + len, view.size() - len);
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return len;
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}
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}}
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#endif // TORRENT_AUX_IO_HPP_INCLUDED
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