84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
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/*
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* libjingle
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* Copyright 2004--2010, Google Inc.
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*
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_BASE_LATEBINDINGSYMBOLTABLE_H_
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#define TALK_BASE_LATEBINDINGSYMBOLTABLE_H_
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#include <string.h>
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#include "talk/base/common.h"
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namespace talk_base {
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#ifdef POSIX
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typedef void *DllHandle;
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#else
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#error Not implemented for this platform
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#endif
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// This is the base class for "symbol table" classes to simplify the dynamic
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// loading of symbols from DLLs. Currently the implementation only supports
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// Linux and OS X, and pure C symbols (or extern "C" symbols that wrap C++
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// functions). Sub-classes for specific DLLs are generated via the "supermacro"
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// files latebindingsymboltable.h.def and latebindingsymboltable.cc.def. See
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// talk/sound/pulseaudiosymboltable.(h|cc) for an example.
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class LateBindingSymbolTable {
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public:
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struct TableInfo {
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const char *dll_name;
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int num_symbols;
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// Array of size num_symbols.
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const char *const *symbol_names;
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};
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LateBindingSymbolTable(const TableInfo *info, void **table);
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~LateBindingSymbolTable();
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bool IsLoaded() const;
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// Loads the DLL and the symbol table. Returns true iff the DLL and symbol
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// table loaded successfully.
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bool Load();
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// Like load, but allows overriding the dll path for when the dll path is
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// dynamic.
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bool LoadFromPath(const char *dll_path);
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void Unload();
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private:
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void ClearSymbols();
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const TableInfo *info_;
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void **table_;
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DllHandle handle_;
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bool undefined_symbols_;
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DISALLOW_COPY_AND_ASSIGN(LateBindingSymbolTable);
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};
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} // namespace talk_base
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#endif // TALK_BASE_LATEBINDINGSYMBOLTABLE_H_
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