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
, char *prefix
, 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( char *prefix
, 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
, 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
, 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
)( 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
);
95 fprintf( stderr
, "Failed to load plugin: %s\n", dlerror() );
97 // Set it on the properties
98 mlt_properties_set_data( object_properties
, "dlopen", object
, 0, ( mlt_destructor
)dlclose
, NULL
);
101 // Now check if we have this symbol pointer
102 if ( object
!= NULL
&& symbol_ptr
== NULL
)
105 symbol_ptr
= dlsym( object
, symbol
);
107 // Set it on the properties
108 mlt_properties_set_data( object_properties
, "dlsym", symbol_ptr
, 0, NULL
, NULL
);
111 // Construct the service
112 return symbol_ptr
!= NULL ?
symbol_ptr( service
, input
) : NULL
;
115 mlt_repository
mlt_repository_init( mlt_properties object_list
, char *prefix
, char *data
, char *symbol
)
117 char full_file
[ 512 ];
120 // Construct the repository
121 mlt_repository
this = calloc( sizeof( struct mlt_repository_s
), 1 );
122 mlt_properties_init( &this->parent
, this );
124 // Add the symbol to THIS repository properties.
125 mlt_properties_set( &this->parent
, "_symbol", symbol
);
127 // Construct full file
128 construct_full_file( full_file
, prefix
, data
);
131 file
= fopen( full_file
, "r" );
133 // Parse the contents
140 while( fgets( full
, 512, file
) )
144 if ( full
[ 0 ] != '#' && full
[ 0 ] != '\0' && sscanf( full
, "%s %s", service
, object
) == 2 )
146 // Get the object properties first
147 mlt_properties object_properties
= mlt_properties_get_data( object_list
, object
, NULL
);
149 // If their are no properties, create them now
150 if ( object_properties
== NULL
)
152 // Construct the object
153 object_properties
= construct_object( prefix
, object
);
155 // Add it to the object list
156 mlt_properties_set_data( object_list
, object
, object_properties
, 0, ( mlt_destructor
)mlt_properties_close
, NULL
);
159 // Now construct a property for the service
160 mlt_properties service_properties
= construct_service( object_properties
, service
);
162 // Add it to the repository
163 mlt_properties_set_data( &this->parent
, service
, service_properties
, 0, ( mlt_destructor
)mlt_properties_close
, NULL
);
174 void *mlt_repository_fetch( mlt_repository
this, char *service
, void *input
)
176 // Get the service properties
177 mlt_properties service_properties
= mlt_properties_get_data( &this->parent
, service
, NULL
);
179 // If the service exists
180 if ( service_properties
!= NULL
)
182 // Get the symbol that is used to generate this service
183 char *symbol
= mlt_properties_get( &this->parent
, "_symbol" );
185 // Now get an instance of the service
186 return construct_instance( service_properties
, symbol
, input
);
192 void mlt_repository_close( mlt_repository
this )
194 mlt_properties_close( &this->parent
);