* DirectX plugin by Gildas Bazin <gbazin@netcourrier.com>.

[vlc] / src / misc / modules_core.h

diff --git a/src/misc/modules_core.h b/src/misc/modules_core.h
new file mode 100644 (file)
index 0000000..7f15428
--- /dev/null
+++ b/src/misc/modules_core.h
@@ -0,0 +1,140 @@
+/*****************************************************************************
+ * modules_core.h : Module management functions used by the core application.
+ *****************************************************************************
+ * Copyright (C) 2001 VideoLAN
+ * $Id: modules_core.h,v 1.1 2001/06/02 01:09:03 sam Exp $
+ *
+ * Authors: Samuel Hocevar <sam@zoy.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Inline functions for handling dynamic modules
+ *****************************************************************************/
+
+/*****************************************************************************
+ * module_load: load a dynamic library
+ *****************************************************************************
+ * This function loads a dynamically linked library using a system dependant
+ * method, and returns a non-zero value on error, zero otherwise.
+ *****************************************************************************/
+static __inline__ int
+module_load( char * psz_filename, module_handle_t * handle )
+{
+#ifdef SYS_BEOS
+    *handle = load_add_on( psz_filename );
+    return( *handle < 0 );
+
+#elif defined(WIN32)
+    *handle = LoadLibrary( psz_filename );
+    return( *handle == NULL ); 
+
+#else
+    /* Do not open modules with RTLD_GLOBAL, or we are going to get namespace
+     * collisions when two modules have common public symbols */
+    *handle = dlopen( psz_filename, RTLD_NOW );
+    return( *handle == NULL );
+
+#endif
+}
+
+/*****************************************************************************
+ * module_unload: unload a dynamic library
+ *****************************************************************************
+ * This function unloads a previously opened dynamically linked library
+ * using a system dependant method. No return value is taken in consideration,
+ * since some libraries sometimes refuse to close properly.
+ *****************************************************************************/
+static __inline__ void
+module_unload( module_handle_t handle )
+{
+#ifdef SYS_BEOS
+    unload_add_on( handle );
+
+#elif defined(WIN32)
+    FreeLibrary( handle );
+
+#else
+    dlclose( handle );
+
+#endif
+    return;
+}
+
+/*****************************************************************************
+ * module_getsymbol: get a symbol from a dynamic library
+ *****************************************************************************
+ * This function queries a loaded library for a symbol specified in a
+ * string, and returns a pointer to it.
+ * FIXME: under Unix we should maybe check for dlerror() instead of the
+ * return value of dlsym, since we could have loaded a symbol really set
+ * to NULL (quite unlikely, though).
+ *****************************************************************************/
+static __inline__ void *
+module_getsymbol( module_handle_t handle, char * psz_function )
+{
+#ifdef SYS_BEOS
+    void * p_symbol;
+    if( B_OK == get_image_symbol( handle, psz_function,
+                                  B_SYMBOL_TYPE_TEXT, &p_symbol ) )
+    {
+        return( p_symbol );
+    }
+    else
+    {
+        return( NULL );
+    }
+
+#elif defined(SYS_DARWIN1_3)
+    /* MacOS X dl library expects symbols to begin with "_". That's
+     * really lame, but hey, what can we do ? */
+    char *  psz_call = malloc( strlen( psz_function ) + 2 );
+    void *  p_return;
+    strcpy( psz_call + 1, psz_function );
+    psz_call[ 0 ] = '_';
+
+    p_return = dlsym( handle, psz_call );
+
+    free( psz_call );
+    return( p_return );
+
+#elif defined(WIN32)
+    return( (void *)GetProcAddress( handle, psz_function ) );
+
+#else
+    return( dlsym( handle, psz_function ) );
+#endif
+}
+
+/*****************************************************************************
+ * module_error: wrapper for dlerror()
+ *****************************************************************************
+ * This function returns the error message of the last module operation. It
+ * returns the string "failed" on systems which do not have the dlerror()
+ * function.
+ *****************************************************************************/
+static __inline__ const char *
+module_error( void )
+{
+#if defined(SYS_BEOS) || defined(WIN32)
+    return( "failed" );
+
+#else
+    return( dlerror() );
+
+#endif
+}
+