Python API

----------
Bugfix #6543: Blender.Library.Load() could segfault if called more than once
with a library of different endian type.  In the process discovered an
invalid memory reference in other another function calling library_append().
Thanks to Brecht for the pointers on tracking this old bug down.

source/blender/blenloader/BLO_readfile.h

@@ -238,7 +238,7 @@ char *BLO_gethome(void);
 int BLO_has_bfile_extension(char *str);
 void BLO_library_append(struct SpaceFile *sfile, char *dir, int idcode);
 void BLO_library_append_(BlendHandle **libfiledata, struct direntry* filelist, int totfile, char *dir, char* file, short flag, int idcode);
-void BLO_script_library_append(BlendHandle *bh, char *dir, char *name, int idcode, short flag, struct Scene *scene);
+void BLO_script_library_append(BlendHandle **bh, char *dir, char *name, int idcode, short flag, struct Scene *scene);
 
 BlendFileData* blo_read_blendafterruntime(int file, int actualsize, BlendReadError *error_r);
 

source/blender/blenloader/intern/readfile.c

@@ -8578,38 +8578,38 @@ static void append_id_part(FileData *fd, Main *mainvar, ID *id, ID **id_r)
 /* common routine to append/link something from a library */
 
 static Library* library_append( Scene *scene, char* file, char *dir, int idcode,
-		int totsel, FileData *fd, struct direntry* filelist, int totfile, short flag)
+		int totsel, FileData **fd, struct direntry* filelist, int totfile, short flag)
 {
 	Main *mainl;
 	Library *curlib;
 
 	/* make mains */
-	blo_split_main(&fd->mainlist, G.main);
+	blo_split_main(&(*fd)->mainlist, G.main);
 
 	/* which one do we need? */
-	mainl = blo_find_main(fd, &fd->mainlist, dir, G.sce);
+	mainl = blo_find_main(*fd, &(*fd)->mainlist, dir, G.sce);
 	
-	mainl->versionfile= fd->fileversion;	/* needed for do_version */
+	mainl->versionfile= (*fd)->fileversion;	/* needed for do_version */
 	
 	curlib= mainl->curlib;
 	
 	if(totsel==0) {
-		append_named_part(fd, mainl, scene, file, idcode, flag);
+		append_named_part(*fd, mainl, scene, file, idcode, flag);
 	}
 	else {
 		int a;
 		for(a=0; a<totfile; a++) {
 			if(filelist[a].flags & ACTIVE) {
-				append_named_part(fd, mainl, scene, filelist[a].relname, idcode, flag);
+				append_named_part(*fd, mainl, scene, filelist[a].relname, idcode, flag);
 			}
 		}
 	}
 
 	/* make main consistant */
-	expand_main(fd, mainl);
+	expand_main(*fd, mainl);
 
 	/* do this when expand found other libs */
-	read_libraries(fd, &fd->mainlist);
+	read_libraries(*fd, &(*fd)->mainlist);
 
 	if(flag & FILE_STRINGCODE) {
 
@@ -8620,10 +8620,10 @@ static Library* library_append( Scene *scene, char* file, char *dir, int idcode,
 		BLI_makestringcode(G.sce, mainl->curlib->name);
 	}
 
-	blo_join_main(&fd->mainlist);
-	G.main= fd->mainlist.first;
+	blo_join_main(&(*fd)->mainlist);
+	G.main= (*fd)->mainlist.first;
 
-	lib_link_all(fd, G.main);
+	lib_link_all(*fd, G.main);
 	lib_verify_nodetree(G.main, 0);
 	fix_relpaths_library(G.sce, G.main); /* make all relative paths, relative to the open blend file */
 
@@ -8642,8 +8642,9 @@ static Library* library_append( Scene *scene, char* file, char *dir, int idcode,
 	/* 20041208: put back. It only linked direct, not indirect objects (ton) */
 	
 	/* patch to prevent switch_endian happens twice */
-	if(fd->flags & FD_FLAGS_SWITCH_ENDIAN) {
-		blo_freefiledata( fd );
+	if((*fd)->flags & FD_FLAGS_SWITCH_ENDIAN) {
+		blo_freefiledata( *fd );
+		*fd = NULL;
 	}	
 
 	return curlib;
@@ -8654,11 +8655,11 @@ static Library* library_append( Scene *scene, char* file, char *dir, int idcode,
 /* append to G.scene */
 /* this should probably be moved into the Python code anyway */
 
-void BLO_script_library_append(BlendHandle *bh, char *dir, char *name, 
+void BLO_script_library_append(BlendHandle **bh, char *dir, char *name, 
 		int idcode, short flag, Scene *scene )
 {
 	/* try to append the requested object */
-	library_append( scene, name, dir, idcode, 0, (FileData *)bh, NULL, 0, flag );
+	library_append( scene, name, dir, idcode, 0, (FileData **)bh, NULL, 0, flag );
 
 	/* do we need to do this? */
 	DAG_scene_sort(G.scene);
@@ -8674,6 +8675,7 @@ void BLO_library_append(SpaceFile *sfile, char *dir, int idcode)
 void BLO_library_append_(BlendHandle** libfiledata, struct direntry* filelist, int totfile, char *dir, char* file, short flag, int idcode)
 {
 	FileData *fd= (FileData*) (*libfiledata);
+	int lastflags = fd->flags;
 	Library *curlib;
 	Base *centerbase;
 	Object *ob;
@@ -8706,12 +8708,7 @@ void BLO_library_append_(BlendHandle** libfiledata, struct direntry* filelist, i
 	
 	if(flag & FILE_AUTOSELECT) scene_deselect_all(G.scene);
 
-	curlib = library_append( G.scene, file, dir, idcode, totsel, fd, filelist, totfile,flag );
-
-	/* patch to prevent switch_endian happens twice */
-	if(fd->flags & FD_FLAGS_SWITCH_ENDIAN) {
-		(*libfiledata)= 0;
-	}	
+	curlib = library_append( G.scene, file, dir, idcode, totsel, (FileData**) libfiledata, filelist, totfile,flag );
 
 	/* when not linking (appending)... */
 	if((flag & FILE_LINK)==0) {

source/blender/python/api2_2x/Library.c

@@ -1,5 +1,5 @@
 /**
- * $Id: Library.c 10943 2007-06-16 12:24:41Z campbellbarton $
+ * $Id$
  *
  * Blender.Library BPython module implementation.
  * This submodule has functions to append data from .blend files.
@@ -175,7 +175,7 @@ static PyObject *M_Library_Open( PyObject * self, PyObject * value )
 	BLI_strncpy(filename, G.sce, sizeof(filename));
 	bpy_openlib = BLO_blendhandle_from_file( fname1 );
 	BLI_strncpy(G.sce, filename, sizeof(filename)); 
-	
+
 	if( !bpy_openlib )
 		return EXPP_ReturnPyObjError( PyExc_IOError, "file not found" );
 
@@ -344,6 +344,7 @@ static PyObject *oldM_Library_Load( PyObject * self, PyObject * args )
 	int blocktype = 0;
 	int linked = 0;
 
+	
 	if( !bpy_openlib ) {
 		return EXPP_ReturnPyObjError( PyExc_IOError,
 					      "no library file: you need to open one, first." );
@@ -359,12 +360,19 @@ static PyObject *oldM_Library_Load( PyObject * self, PyObject * args )
 	if( !blocktype )
 		return EXPP_ReturnPyObjError( PyExc_NameError,
 					      "no such Blender datablock type" );
-	
+
 	if (linked)
-		BLO_script_library_append( bpy_openlib, bpy_openlibname, name, blocktype, FILE_LINK, G.scene);
+		BLO_script_library_append( &bpy_openlib, bpy_openlibname, name, blocktype, FILE_LINK, G.scene);
 	else
-		BLO_script_library_append( bpy_openlib, bpy_openlibname, name, blocktype, 0, G.scene);
-	
+		BLO_script_library_append( &bpy_openlib, bpy_openlibname, name, blocktype, 0, G.scene);
+
+	/*
+		NOTE:  BLO_script_library_append() can close the library if there is
+		an endian issue.  if this happened, reopen for the next call.
+	*/
+	if ( !bpy_openlib )
+		bpy_openlib = BLO_blendhandle_from_file( bpy_openlibname );
+
 	if( update ) {
 		M_Library_Update( self );
 		Py_DECREF( Py_None );	/* incref'ed by above function */
@@ -610,7 +618,7 @@ PyObject *LibraryData_importLibData( BPy_LibraryData *self, char *name,
 	}
 
 	/* import from the libary */
-	BLO_script_library_append( openlib, longFilename, name, self->type, mode,
+	BLO_script_library_append( &openlib, longFilename, name, self->type, mode,
 			scene );
 
 	/*