def build (self, parcel, rect, simplify=True):
buffer = BufferStream()
#### header ####
# freme size
buffer.writeDword(0) #< frame size
buffer.writeDword(0) #< road offset
buffer.writeDword(0) #< road size
buffer.writeDword(0) #< road name offset
buffer.writeDword(0) #< road name size
buffer.writeDword(0) #< back offset
buffer.writeDword(0) #< back size
buffer.writeDword(0) #< back name offset
buffer.writeDword(0) #< back name size
#### road frame #####
road_offset = buffer.tell()
road_name_builder = RoadNameBuilder()
road_builder = RoadBuilder(road_name_builder)
road_builder.build(parcel, rect, simplify)
road_builder.save(buffer)
road_size = buffer.tell() - road_offset
road_name_offset = buffer.tell()
road_name_builder.save(buffer)
road_name_size = buffer.tell()-road_name_offset
#### back frame #####
back_offset = buffer.tell()
back_name_builder = BackNameBuilder()
back_builder = BackBuilder(back_name_builder)
back_builder.build(parcel, rect)
back_builder.save(buffer)
back_size = buffer.tell()-back_offset
back_name_offset = buffer.tell()
back_name_builder.save(buffer)
back_name_size = buffer.tell()-back_name_offset
#### rewrite header ####
parcel_size = buffer.tell()
buffer.seek(0)
buffer.writeDword(parcel_size)
buffer.writeDword(road_offset)
buffer.writeDword(road_size)
buffer.writeDword(road_name_offset)
buffer.writeDword(road_name_size)
buffer.writeDword(back_offset)
buffer.writeDword(back_size)
buffer.writeDword(back_name_offset)
buffer.writeDword(back_name_size)
## return
return buffer.getValue()
class RoadNameBuilder:
def __init__ (self):
self.__stream = BufferStream()
self.__name_dict = {}
def build (self, name):
offset = self.__name_dict.get(name)
if offset == None:
offset = self.__stream.tell()
self.__stream.writeWord(len(name))
self.__stream.write(name)
self.__name_dict[name] = offset
return offset
def save (self, stream):
stream.write(self.__stream.getValue())
