/**
* Loads a plugins cache file.
*
* This function will load the plugin cache if present and valid. This cache
* will in turn be queried by AllocateAllPlugins() to see if it needs to
* actually load the dynamically loadable module.
* This allows us to only fully load plugins when they are actually used.
*/
size_t CacheLoad( vlc_object_t *p_this, const char *dir, module_cache_t **r )
{
char *psz_filename;
FILE *file;
int i_size, i_read;
char p_cachestring[sizeof(CACHE_STRING)];
size_t i_cache;
int32_t i_marker;
assert( dir != NULL );
*r = NULL;
if( asprintf( &psz_filename, "%s"DIR_SEP CACHE_NAME, dir ) == -1 )
return 0;
msg_Dbg( p_this, "loading plugins cache file %s", psz_filename );
file = vlc_fopen( psz_filename, "rb" );
if( !file )
{
msg_Warn( p_this, "cannot read %s: %s", psz_filename,
vlc_strerror_c(errno) );
free( psz_filename );
return 0;
}
free( psz_filename );
/* Check the file is a plugins cache */
i_size = sizeof(CACHE_STRING) - 1;
i_read = fread( p_cachestring, 1, i_size, file );
if( i_read != i_size ||
memcmp( p_cachestring, CACHE_STRING, i_size ) )
{
msg_Warn( p_this, "This doesn't look like a valid plugins cache" );
fclose( file );
return 0;
}
#ifdef DISTRO_VERSION
/* Check for distribution specific version */
char p_distrostring[sizeof( DISTRO_VERSION )];
i_size = sizeof( DISTRO_VERSION ) - 1;
i_read = fread( p_distrostring, 1, i_size, file );
if( i_read != i_size ||
memcmp( p_distrostring, DISTRO_VERSION, i_size ) )
{
msg_Warn( p_this, "This doesn't look like a valid plugins cache" );
fclose( file );
return 0;
}
#endif
/* Check Sub-version number */
i_read = fread( &i_marker, 1, sizeof(i_marker), file );
if( i_read != sizeof(i_marker) || i_marker != CACHE_SUBVERSION_NUM )
{
msg_Warn( p_this, "This doesn't look like a valid plugins cache "
"(corrupted header)" );
fclose( file );
return 0;
}
/* Check header marker */
i_read = fread( &i_marker, 1, sizeof(i_marker), file );
if( i_read != sizeof(i_marker) ||
i_marker != ftell( file ) - (int)sizeof(i_marker) )
{
msg_Warn( p_this, "This doesn't look like a valid plugins cache "
"(corrupted header)" );
fclose( file );
return 0;
}
if (fread( &i_cache, 1, sizeof(i_cache), file ) != sizeof(i_cache) )
{
msg_Warn( p_this, "This doesn't look like a valid plugins cache "
"(file too short)" );
fclose( file );
return 0;
}
module_cache_t *cache = NULL;
for (size_t count = 0; count < i_cache;)
{
module_t *module;
int i_submodules;
module = vlc_module_create (NULL);
/* Load additional infos */
LOAD_STRING(module->psz_shortname);
LOAD_STRING(module->psz_longname);
LOAD_STRING(module->psz_help);
LOAD_IMMEDIATE(module->i_shortcuts);
if (module->i_shortcuts > MODULE_SHORTCUT_MAX)
goto error;
else
{
module->pp_shortcuts =
xmalloc (sizeof (*module->pp_shortcuts) * module->i_shortcuts);
for (unsigned j = 0; j < module->i_shortcuts; j++)
LOAD_STRING(module->pp_shortcuts[j]);
}
LOAD_STRING(module->psz_capability);
LOAD_IMMEDIATE(module->i_score);
LOAD_IMMEDIATE(module->b_unloadable);
/* Config stuff */
if (CacheLoadModuleConfig (module, file) != VLC_SUCCESS)
goto error;
LOAD_STRING(module->domain);
if (module->domain != NULL)
vlc_bindtextdomain (module->domain);
LOAD_IMMEDIATE( i_submodules );
while( i_submodules-- )
{
module_t *submodule = vlc_module_create (module);
free (submodule->pp_shortcuts);
LOAD_STRING(submodule->psz_shortname);
LOAD_STRING(submodule->psz_longname);
LOAD_IMMEDIATE(submodule->i_shortcuts);
if (submodule->i_shortcuts > MODULE_SHORTCUT_MAX)
goto error;
else
{
submodule->pp_shortcuts =
xmalloc (sizeof (*submodule->pp_shortcuts) * submodule->i_shortcuts);
for (unsigned j = 0; j < submodule->i_shortcuts; j++)
LOAD_STRING(submodule->pp_shortcuts[j]);
}
LOAD_STRING(submodule->psz_capability);
LOAD_IMMEDIATE(submodule->i_score);
}
char *path;
struct stat st;
/* Load common info */
LOAD_STRING(path);
if (path == NULL)
goto error;
LOAD_IMMEDIATE(st.st_mtime);
LOAD_IMMEDIATE(st.st_size);
CacheAdd (&cache, &count, path, &st, module);
free (path);
/* TODO: deal with errors */
}
fclose( file );
*r = cache;
return i_cache;
error:
msg_Warn( p_this, "plugins cache not loaded (corrupted)" );
/* TODO: cleanup */
fclose( file );
return 0;
}
static module_t *CacheLoadModule (FILE *file)
{
module_t *module = vlc_module_create (NULL);
if (unlikely(module == NULL))
return NULL;
/* Load additional infos */
LOAD_STRING(module->psz_shortname);
LOAD_STRING(module->psz_longname);
LOAD_STRING(module->psz_help);
LOAD_IMMEDIATE(module->i_shortcuts);
if (module->i_shortcuts > MODULE_SHORTCUT_MAX)
goto error;
else
{
module->pp_shortcuts =
xmalloc (sizeof (*module->pp_shortcuts) * module->i_shortcuts);
for (unsigned j = 0; j < module->i_shortcuts; j++)
LOAD_STRING(module->pp_shortcuts[j]);
}
LOAD_STRING(module->psz_capability);
LOAD_IMMEDIATE(module->i_score);
LOAD_IMMEDIATE(module->b_unloadable);
/* Config stuff */
if (CacheLoadModuleConfig (module, file) != VLC_SUCCESS)
goto error;
LOAD_STRING(module->domain);
if (module->domain != NULL)
vlc_bindtextdomain (module->domain);
uint32_t submodules;
LOAD_IMMEDIATE(submodules);
for (; submodules > 0; submodules--)
{
module_t *submodule = vlc_module_create (module);
free (submodule->pp_shortcuts);
LOAD_STRING(submodule->psz_shortname);
LOAD_STRING(submodule->psz_longname);
LOAD_IMMEDIATE(submodule->i_shortcuts);
if (submodule->i_shortcuts > MODULE_SHORTCUT_MAX)
goto error;
else
{
submodule->pp_shortcuts =
xmalloc (sizeof (*submodule->pp_shortcuts) * submodule->i_shortcuts);
for (unsigned j = 0; j < submodule->i_shortcuts; j++)
LOAD_STRING(submodule->pp_shortcuts[j]);
}
LOAD_STRING(submodule->psz_capability);
LOAD_IMMEDIATE(submodule->i_score);
}
return module;
error:
vlc_module_destroy(module);
return NULL;
}
