avmedia/source/vlc/wrapper/SymbolLoader.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #ifndef INCLUDED_AVMEDIA_SOURCE_VLC_WRAPPER_SYMBOLLOADER_HXX
  11 #define INCLUDED_AVMEDIA_SOURCE_VLC_WRAPPER_SYMBOLLOADER_HXX
  12 #if defined(_WIN32)
  13 #if !defined WIN32_LEAN_AND_MEAN
  14 # define WIN32_LEAN_AND_MEAN
  15 #endif
  16 # include <windows.h>
  17 # include <winreg.h>
  18 #endif
  19 #include <osl/module.h>
  20 #include <rtl/ustring.hxx>
  21 #include <sal/log.hxx>
  22
  23 #define SYM_MAP(a) { #a, reinterpret_cast<SymbolFunc *>(&a) }
  24
  25 namespace avmedia
  26 {
  27 namespace vlc
  28 {
  29 namespace wrapper
  30 {
  31 typedef void (*SymbolFunc) (void);
  32
  33 struct ApiMap
  34 {
  35     const char *symName;
  36     SymbolFunc *refValue;
  37 };
  38
  39 #if defined( LINUX )
  40     const char LibName[] = "libvlc.so.5";
  41 #elif defined( MACOSX )
  42     const char LibName[] = "/Applications/VLC.app/Contents/MacOS/lib/libvlc.dylib";
  43 #elif defined( WNT )
  44     const char LibName[] = "libvlc.dll";
  45
  46     inline OUString GetVLCPath()
  47     {
  48         HKEY hKey;
  49         wchar_t arCurrent[MAX_PATH];
  50         DWORD dwType, dwCurrentSize = sizeof( arCurrent );
  51
  52         //TODO: This one will work only with LibreOffice 32-bit + VLC 32-bit on Win x86_64.
  53         const LONG errorCore = ::RegOpenKeyExW( HKEY_LOCAL_MACHINE, L"SOFTWARE\\Wow6432Node\\VideoLAN\\VLC", 0, KEY_READ | KEY_WOW64_64KEY, &hKey );
  54         if ( errorCore == ERROR_SUCCESS )
  55         {
  56             if ( ::RegQueryValueExW( hKey, L"InstallDir", NULL, &dwType, (LPBYTE) arCurrent, &dwCurrentSize ) == ERROR_SUCCESS &&
  57                  dwType == REG_SZ )
  58             {
  59                 ::RegCloseKey( hKey );
  60                 dwCurrentSize -= 2;
  61                 dwCurrentSize /= 2;
  62
  63                 return OUString( arCurrent, dwCurrentSize ) + OUString::createFromAscii("\\");
  64             }
  65
  66             ::RegCloseKey( hKey );
  67         }
  68
  69         return OUString();
  70     }
  71 #endif
  72
  73     template<size_t N>
  74     bool tryLink( oslModule &aModule, const ApiMap ( &pMap )[N] )
  75     {
  76         for (size_t i = 0; i < N; ++i)
  77         {
  78             SymbolFunc aMethod = reinterpret_cast<SymbolFunc>(osl_getFunctionSymbol
  79                 ( aModule, OUString::createFromAscii( pMap[ i ].symName ).pData ));
  80             if ( !aMethod )
  81             {
  82                 SAL_WARN("avmedia", "Cannot load method " << pMap[ i ].symName);
  83                 *pMap[ i ].refValue = nullptr;
  84                 return false;
  85             }
  86             else
  87                 *pMap[ i ].refValue = aMethod;
  88         }
  89
  90         return true;
  91     }
  92
  93     template<size_t N>
  94     bool InitApiMap( const ApiMap ( &pMap )[N]  )
  95     {
  96 #if defined( LINUX ) || defined( MACOSX )
  97         OUString const fullPath(LibName);
  98 #elif defined( WNT )
  99         OUString const fullPath(GetVLCPath() + LibName);
 100 #endif
 101         SAL_INFO("avmedia", fullPath);
 102
 103         oslModule aModule = osl_loadModule( fullPath.pData,
 104                                             SAL_LOADMODULE_DEFAULT );
 105
 106
 107         if( aModule == nullptr)
 108         {
 109             SAL_WARN("avmedia", "Cannot load libvlc");
 110             return false;
 111         }
 112
 113         if (tryLink( aModule, pMap ))
 114         {
 115             return true;
 116         }
 117
 118         SAL_WARN("avmedia", "Cannot load libvlc");
 119         osl_unloadModule( aModule );
 120
 121         return false;
 122     }
 123 }
 124 }
 125 }
 126
 127 #endif
 128
 129 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */