def _propertiesDecode_(self,io: IO) -> int:
"""
decode a list of properties
"""
while True:
try:
propertyType=io.u32
dataLength=io.u32
except struct.error: # end of data, so that's that.
break
if propertyType==0:
break
self._propertyDecode_(propertyType,io.getBytes(dataLength))
return io.index
def _decode_(self, data: bytes, index: int = 0):
"""
decode a byte buffer
:param data: data buffer to decode
:param index: index within the buffer to start at
"""
io = IO(data, index)
if io.getBytes(9) != "gimp xcf ".encode('ascii'):
raise Exception('Not a valid GIMP file')
version = io.cString
if version == 'file':
self.version = 0
else:
self.version = int(version[1:])
self.width = io.u32
self.height = io.u32
self.baseColorMode = io.u32
self.precision = Precision()
self.precision.decode(self.version, io)
self._propertiesDecode_(io)
self._layerPtr = []
self._layers = []
while True:
ptr = self._pointerDecode_(io)
if ptr == 0:
break
self._layerPtr.append(ptr)
l = GimpLayer(self)
l._decode_(io.data, ptr)
self._layers.append(l)
self._channelPtr = []
self.channels = []
while True:
ptr = self._pointerDecode_(io)
if ptr == 0:
break
self._channelPtr.append(ptr)
c = GimpChannel(self)
c.fromBytes(io.data, ptr)
self.channels.append(c)
return io.index