plugins.c

vlc stand 0.1.99 ist sehr einfach

/*****************************************************************************
 * plugins.c : Dynamic plugin management functions
 *****************************************************************************
 * Copyright (C) 1999, 2000 VideoLAN
 *
 * Authors:
 *
 * 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.
 *****************************************************************************/
#include "defs.h"

#include <stdlib.h>                                      /* free(), strtol() */
#include <stdio.h>                                              /* sprintf() */

#if defined(HAVE_DLFCN_H)                                /* Linux, BSD, Hurd */
#include <dlfcn.h>                           /* dlopen(), dlsym(), dlclose() */

#elif defined(HAVE_IMAGE_H)                                          /* BeOS */
#include <image.h>

#else
#error no dynamic plugins available on your system !
#endif

#ifdef SYS_BEOS
#include "beos_specific.h"
#endif

#include "plugins.h"

#define PLUGIN_PATH_COUNT 5

int RequestPlugin ( plugin_id_t * p_plugin, char * psz_mask, char * psz_name )
{
    int i_count, i_length;
    char * psz_plugin;
    char * psz_plugin_path[ PLUGIN_PATH_COUNT ] =
    {
        ".",
        "plugins/aout", "plugins/vout", "plugins/intf", /* these ones should disappear */
        PLUGIN_PATH
    };

    i_length = strlen( psz_mask ) + strlen( psz_name );

    for ( i_count = 0 ; i_count < PLUGIN_PATH_COUNT ; i_count++ )
    {
#ifdef SYS_BEOS
        char * psz_program_path;
        
        psz_program_path = beos_GetProgramPath();
        psz_plugin = malloc( strlen(psz_plugin_path[i_count]) + strlen(psz_program_path) + i_length + 6 );
        sprintf( psz_plugin, "%s/%s/%s_%s.so", psz_program_path, psz_plugin_path[i_count], psz_mask, psz_name );        
#else
        psz_plugin = malloc( strlen(psz_plugin_path[i_count]) + i_length + 6 );
        sprintf( psz_plugin, "%s/%s_%s.so", psz_plugin_path[i_count], psz_mask, psz_name );
#endif

#if defined(HAVE_DLFCN_H)
        *p_plugin = dlopen( psz_plugin, RTLD_NOW | RTLD_GLOBAL );
#elif defined(HAVE_IMAGE_H)
        *p_plugin = load_add_on( psz_plugin );
#endif

        free( psz_plugin );

#if defined(HAVE_DLFCN_H)
	if( *p_plugin != NULL )
#elif defined(HAVE_IMAGE_H)
        if( *p_plugin >= 0 )
#endif
        {
            return( 0 );
        }
    }

    return( -1 );
}

void TrashPlugin ( plugin_id_t plugin )
{
#if defined(HAVE_DLFCN_H)
    dlclose( plugin );
#elif defined(HAVE_IMAGE_H)
    unload_add_on( plugin );
#endif
}

void * GetPluginFunction ( plugin_id_t plugin, char *psz_name )
{
#if defined(HAVE_DLFCN_H)
    return( dlsym(plugin, psz_name) );
#elif defined(HAVE_IMAGE_H)
    void * p_func;   
    if( get_image_symbol( plugin, psz_name, B_SYMBOL_TYPE_TEXT, &p_func ) )
        return( NULL );
    else
        return( p_func );    
#endif
}