2 * repository.c -- provides a map between service and shared objects
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 #include "mlt_repository.h"
22 #include "mlt_properties.h"
29 struct mlt_repository_s
31 struct mlt_properties_s parent;
34 static char *construct_full_file( char *output, const char *prefix, const char *file )
36 strcpy( output, prefix );
37 if ( prefix[ strlen( prefix ) - 1 ] != '/' )
38 strcat( output, "/" );
39 strcat( output, file );
43 static char *chomp( char *input )
45 if ( input[ strlen( input ) - 1 ] == '\n' )
46 input[ strlen( input ) - 1 ] = '\0';
50 static mlt_properties construct_object( const char *prefix, const char *id )
52 mlt_properties output = mlt_properties_new( );
53 mlt_properties_set( output, "prefix", prefix );
54 mlt_properties_set( output, "id", id );
58 static mlt_properties construct_service( mlt_properties object, const char *id )
60 mlt_properties output = mlt_properties_new( );
61 mlt_properties_set_data( output, "object", object, 0, NULL, NULL );
62 mlt_properties_set( output, "id", id );
66 static void *construct_instance( mlt_properties service_properties, const char *symbol, void *input )
68 // Extract the service
69 char *service = mlt_properties_get( service_properties, "id" );
71 // Get the object properties
72 void *object_properties = mlt_properties_get_data( service_properties, "object", NULL );
74 // Get the dlopen'd object
75 void *object = mlt_properties_get_data( object_properties, "dlopen", NULL );
77 // Get the dlsym'd symbol
78 void *( *symbol_ptr )( const char *, void * ) = mlt_properties_get_data( object_properties, symbol, NULL );
80 // Check that we have object and open if we don't
83 char full_file[ 512 ];
85 // Get the prefix and id of the shared object
86 char *prefix = mlt_properties_get( object_properties, "prefix" );
87 char *file = mlt_properties_get( object_properties, "id" );
89 // Construct the full file
90 construct_full_file( full_file, prefix, file );
92 // Open the shared object
93 object = dlopen( full_file, RTLD_NOW | RTLD_GLOBAL );
96 // Set it on the properties
97 mlt_properties_set_data( object_properties, "dlopen", object, 0, ( mlt_destructor )dlclose, NULL );
101 fprintf( stderr, "Failed to load plugin: %s\n", dlerror() );
105 // Now check if we have this symbol pointer
106 if ( object != NULL && symbol_ptr == NULL )
109 symbol_ptr = dlsym( object, symbol );
111 // Set it on the properties
112 mlt_properties_set_data( object_properties, "dlsym", symbol_ptr, 0, NULL, NULL );
115 // Construct the service
116 return symbol_ptr != NULL ? symbol_ptr( service, input ) : NULL;
119 mlt_repository mlt_repository_init( mlt_properties object_list, const char *prefix, const char *data, const char *symbol )
121 char full_file[ 512 ];
124 // Construct the repository
125 mlt_repository this = calloc( sizeof( struct mlt_repository_s ), 1 );
126 mlt_properties_init( &this->parent, this );
128 // Add the symbol to THIS repository properties.
129 mlt_properties_set( &this->parent, "_symbol", symbol );
131 // Construct full file
132 construct_full_file( full_file, prefix, data );
133 strcat( full_file, ".dat" );
136 file = fopen( full_file, "r" );
138 // Parse the contents
145 while( fgets( full, 512, file ) )
149 if ( full[ 0 ] != '#' && full[ 0 ] != '\0' && sscanf( full, "%s %s", service, object ) == 2 )
151 // Get the object properties first
152 mlt_properties object_properties = mlt_properties_get_data( object_list, object, NULL );
154 // If their are no properties, create them now
155 if ( object_properties == NULL )
157 // Construct the object
158 object_properties = construct_object( prefix, object );
160 // Add it to the object list
161 mlt_properties_set_data( object_list, object, object_properties, 0, ( mlt_destructor )mlt_properties_close, NULL );
164 // Now construct a property for the service
165 mlt_properties service_properties = construct_service( object_properties, service );
167 // Add it to the repository
168 mlt_properties_set_data( &this->parent, service, service_properties, 0, ( mlt_destructor )mlt_properties_close, NULL );
179 void *mlt_repository_fetch( mlt_repository this, const char *service, void *input )
181 // Get the service properties
182 mlt_properties service_properties = mlt_properties_get_data( &this->parent, service, NULL );
184 // If the service exists
185 if ( service_properties != NULL )
187 // Get the symbol that is used to generate this service
188 char *symbol = mlt_properties_get( &this->parent, "_symbol" );
190 // Now get an instance of the service
191 return construct_instance( service_properties, symbol, input );
197 void mlt_repository_close( mlt_repository this )
199 mlt_properties_close( &this->parent );