lwObject *lwGetObject5( char *filename, picoMemStream_t *fp, unsigned int *failID, int *failpos )
{
lwObject *object;
lwLayer *layer;
lwNode *node;
unsigned int id, formsize, type, cksize;
/* open the file */
if ( !fp ) return NULL;
/* read the first 12 bytes */
set_flen( 0 );
id = getU4( fp );
formsize = getU4( fp );
type = getU4( fp );
if ( 12 != get_flen() ) {
return NULL;
}
/* LWOB? */
if ( id != ID_FORM || type != ID_LWOB ) {
if ( failpos ) *failpos = 12;
return NULL;
}
/* allocate an object and a default layer */
object = _pico_calloc( 1, sizeof( lwObject ));
if ( !object ) goto Fail;
layer = _pico_calloc( 1, sizeof( lwLayer ));
if ( !layer ) goto Fail;
object->layer = layer;
object->nlayers = 1;
/* get the first chunk header */
id = getU4( fp );
cksize = getU4( fp );
if ( 0 > get_flen() ) goto Fail;
/* process chunks as they're encountered */
while ( 1 ) {
cksize += cksize & 1;
switch ( id )
{
case ID_PNTS:
if ( !lwGetPoints( fp, cksize, &layer->point ))
goto Fail;
break;
case ID_POLS:
if ( !lwGetPolygons5( fp, cksize, &layer->polygon,
layer->point.offset ))
goto Fail;
break;
case ID_SRFS:
if ( !lwGetTags( fp, cksize, &object->taglist ))
goto Fail;
break;
case ID_SURF:
node = ( lwNode * ) lwGetSurface5( fp, cksize, object );
if ( !node ) goto Fail;
lwListAdd( (void *) &object->surf, node );
object->nsurfs++;
break;
default:
_pico_memstream_seek( fp, cksize, PICO_SEEK_CUR );
break;
}
/* end of the file? */
if ( formsize <= _pico_memstream_tell( fp ) - 8 ) break;
/* get the next chunk header */
set_flen( 0 );
id = getU4( fp );
cksize = getU4( fp );
if ( 8 != get_flen() ) goto Fail;
}
lwGetBoundingBox( &layer->point, layer->bbox );
lwGetPolyNormals( &layer->point, &layer->polygon );
if ( !lwGetPointPolygons( &layer->point, &layer->polygon )) goto Fail;
if ( !lwResolvePolySurfaces( &layer->polygon, &object->taglist,
&object->surf, &object->nsurfs )) goto Fail;
lwGetVertNormals( &layer->point, &layer->polygon );
return object;
Fail:
if ( failID ) *failID = id;
if ( fp ) {
if ( failpos ) *failpos = _pico_memstream_tell( fp );
}
lwFreeObject( object );
return NULL;
}
lwObject *lwGetObject( char *filename, unsigned int *failID, int *failpos )
{
FILE *fp = NULL;
lwObject *object;
lwLayer *layer;
lwNode *node;
unsigned int id, formsize, type, cksize;
int i, rlen;
/* open the file */
fp = fopen( filename, "rb" );
if ( !fp ) return NULL;
/* read the first 12 bytes */
set_flen( 0 );
id = getU4( fp );
formsize = getU4( fp );
type = getU4( fp );
if ( 12 != get_flen() ) {
fclose( fp );
return NULL;
}
/* is this a LW object? */
if ( id != ID_FORM ) {
fclose( fp );
if ( failpos ) *failpos = 12;
return NULL;
}
if ( type != ID_LWO2 ) {
fclose( fp );
if ( type == ID_LWOB )
return lwGetObject5( filename, failID, failpos );
else {
if ( failpos ) *failpos = 12;
return NULL;
}
}
/* allocate an object and a default layer */
object = calloc( 1, sizeof( lwObject ));
if ( !object ) goto Fail;
layer = calloc( 1, sizeof( lwLayer ));
if ( !layer ) goto Fail;
object->layer = layer;
/* get the first chunk header */
id = getU4( fp );
cksize = getU4( fp );
if ( 0 > get_flen() ) goto Fail;
/* process chunks as they're encountered */
while ( 1 ) {
cksize += cksize & 1;
switch ( id )
{
case ID_LAYR:
if ( object->nlayers > 0 ) {
layer = calloc( 1, sizeof( lwLayer ));
if ( !layer ) goto Fail;
lwListAdd( &object->layer, layer );
}
object->nlayers++;
set_flen( 0 );
layer->index = getU2( fp );
layer->flags = getU2( fp );
layer->pivot[ 0 ] = getF4( fp );
layer->pivot[ 1 ] = getF4( fp );
layer->pivot[ 2 ] = getF4( fp );
layer->name = getS0( fp );
rlen = get_flen();
if ( rlen < 0 || rlen > cksize ) goto Fail;
if ( rlen <= cksize - 2 )
layer->parent = getU2( fp );
if ( rlen < cksize )
fseek( fp, cksize - rlen, SEEK_CUR );
break;
case ID_PNTS:
if ( !lwGetPoints( fp, cksize, &layer->point ))
goto Fail;
break;
case ID_POLS:
if ( !lwGetPolygons( fp, cksize, &layer->polygon,
layer->point.offset ))
goto Fail;
break;
case ID_VMAP:
case ID_VMAD:
node = ( lwNode * ) lwGetVMap( fp, cksize, layer->point.offset,
layer->polygon.offset, id == ID_VMAD );
if ( !node ) goto Fail;
lwListAdd( &layer->vmap, node );
layer->nvmaps++;
break;
case ID_PTAG:
if ( !lwGetPolygonTags( fp, cksize, &object->taglist,
&layer->polygon ))
goto Fail;
break;
case ID_BBOX:
set_flen( 0 );
for ( i = 0; i < 6; i++ )
layer->bbox[ i ] = getF4( fp );
rlen = get_flen();
if ( rlen < 0 || rlen > cksize ) goto Fail;
if ( rlen < cksize )
fseek( fp, cksize - rlen, SEEK_CUR );
break;
case ID_TAGS:
if ( !lwGetTags( fp, cksize, &object->taglist ))
goto Fail;
break;
case ID_ENVL:
node = ( lwNode * ) lwGetEnvelope( fp, cksize );
if ( !node ) goto Fail;
lwListAdd( &object->env, node );
object->nenvs++;
break;
case ID_CLIP:
node = ( lwNode * ) lwGetClip( fp, cksize );
if ( !node ) goto Fail;
lwListAdd( &object->clip, node );
object->nclips++;
break;
case ID_SURF:
node = ( lwNode * ) lwGetSurface( fp, cksize );
if ( !node ) goto Fail;
lwListAdd( &object->surf, node );
object->nsurfs++;
break;
case ID_DESC:
case ID_TEXT:
case ID_ICON:
default:
fseek( fp, cksize, SEEK_CUR );
break;
}
/* end of the file? */
if ( formsize <= ftell( fp ) - 8 ) break;
/* get the next chunk header */
set_flen( 0 );
id = getU4( fp );
cksize = getU4( fp );
if ( 8 != get_flen() ) goto Fail;
}
fclose( fp );
fp = NULL;
if ( object->nlayers == 0 )
object->nlayers = 1;
layer = object->layer;
while ( layer ) {
lwGetBoundingBox( &layer->point, layer->bbox );
lwGetPolyNormals( &layer->point, &layer->polygon );
if ( !lwGetPointPolygons( &layer->point, &layer->polygon )) goto Fail;
if ( !lwResolvePolySurfaces( &layer->polygon, &object->taglist,
&object->surf, &object->nsurfs )) goto Fail;
lwGetVertNormals( &layer->point, &layer->polygon );
if ( !lwGetPointVMaps( &layer->point, layer->vmap )) goto Fail;
if ( !lwGetPolyVMaps( &layer->polygon, layer->vmap )) goto Fail;
layer = layer->next;
}
return object;
Fail:
if ( failID ) *failID = id;
if ( fp ) {
if ( failpos ) *failpos = ftell( fp );
fclose( fp );
}
lwFreeObject( object );
return NULL;
}