85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
/*
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Copyright (c) 2016-2018, 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_WIN_UTIL_HPP
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#define TORRENT_WIN_UTIL_HPP
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#include "libtorrent/config.hpp"
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namespace libtorrent { namespace aux {
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template <typename Library>
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HMODULE get_library_handle()
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{
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static bool handle_checked = false;
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static HMODULE handle = 0;
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if (!handle_checked)
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{
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handle = LoadLibraryA(Library::library_name);
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handle_checked = true;
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}
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return handle;
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}
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template <typename Library, typename Signature>
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Signature get_library_procedure(LPCSTR name)
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{
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static Signature proc = nullptr;
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static bool failed_proc = false;
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if ((proc == nullptr) && !failed_proc)
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{
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HMODULE const handle = get_library_handle<Library>();
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if (handle) proc = (Signature)GetProcAddress(handle, name);
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failed_proc = (proc == nullptr);
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}
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return proc;
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}
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struct iphlpapi {
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static constexpr char const* library_name = "iphlpapi.dll";
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};
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struct kernel32 {
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static constexpr char const* library_name = "kernel32.dll";
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};
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struct advapi32 {
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static constexpr char const* library_name = "advapi32.dll";
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};
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} // namespace aux
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} // namespace libtorrent
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#endif
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