def decode(self, data: bytes, index: int = 0) -> int:
"""Decode a byte buffer.
Args:
data (bytes): data buffer to decode
index (int, optional): index within the buffer to start at. Defaults to 0.
Raises:
RuntimeError: "unknown brush version"
RuntimeError: "File format error. Magic value mismatch"
Returns:
int: offset]
"""
ioBuf = IO(data, index)
headerSize = ioBuf.u32
self.version = ioBuf.u32
if self.version != 2:
raise RuntimeError(f"ERR: unknown brush version {self.version}")
self.width = ioBuf.u32
self.height = ioBuf.u32
self.bpp = ioBuf.u32 # only allows grayscale or RGB
self.mode = self.COLOR_MODES[self.bpp]
magic = ioBuf.getBytes(4)
if magic.decode("ascii") != "GIMP":
raise RuntimeError('"' + magic.decode("ascii") + '" ' +
str(index) +
" File format error. Magic value mismatch.")
self.spacing = ioBuf.u32
nameLen = headerSize - ioBuf.index
self.name = ioBuf.getBytes(nameLen).decode("UTF-8")
self.rawImage = ioBuf.getBytes(self.width * self.height * self.bpp)
return ioBuf.index
def decode(self, data: bytes, index: int = 0) -> int: """Decode a byte buffer :param data: data buffer to decode :param index: index within the buffer to start at """ ioBuf = IO(data, index) self.name = ioBuf.sz754 self.flags = ioBuf.u32 dataLength = ioBuf.u32 self.data = ioBuf.getBytes(dataLength) return ioBuf.index
def _propertiesDecode(self, ioBuf: IO): """Decode a list of properties.""" while True: try: propertyType = ioBuf.u32 dataLength = ioBuf.u32 except struct.error: # end of data, so that's that. break if propertyType == 0: break self._propertyDecode(propertyType, ioBuf.getBytes(dataLength)) return ioBuf.index
def decode(self, data: bytes, index: int = 0) -> int:
"""Decode a byte buffer.
Steps:
Create a new IO buffer (array of binary values)
Check that the file is a valid gimp xcf
Grab the file version
Grab other attributes as outlined in the spec
Get precision data using the class and ioBuf buffer
List of properties
Get the layers and add the pointers to them
Get the channels and add the pointers to them
Return the offset
Args:
data (bytes): data buffer to decode
index (int, optional): index within the buffer to start at]. Defaults to 0.
Raises:
RuntimeError: "Not a valid GIMP file"
Returns:
int: offset
"""
# Create a new IO buffer (array of binary values)
ioBuf = IO(data, index)
# Check that the file is a valid gimp xcf
if ioBuf.getBytes(9) != b"gimp xcf ":
raise RuntimeError("Not a valid GIMP file")
# Grab the file version
version = ioBuf.cString
if version == "file":
self.version = 0
else:
self.version = int(version[1:])
# Grab other attributes as outlined in the spec
self.width = ioBuf.u32
self.height = ioBuf.u32
self.baseColorMode = ioBuf.u32
# Get precision data using the class and ioBuf buffer
self.precision = Precision()
self.precision.decode(self.version, ioBuf)
# List of properties
self._propertiesDecode(ioBuf)
self._layerPtr = []
self._layers = []
# Get the layers and add the pointers to them
while True:
ptr = self._pointerDecode(ioBuf)
if ptr == 0:
break
self._layerPtr.append(ptr)
layer = GimpLayer(self)
layer.decode(ioBuf.data, ptr)
self._layers.append(layer)
# Get the channels and add the pointers to them
self._channelPtr = []
self._channels = []
while True:
ptr = self._pointerDecode(ioBuf)
if ptr == 0:
break
self._channelPtr.append(ptr)
chnl = GimpChannel(self)
chnl.decode(ioBuf.data, ptr)
self._channels.append(chnl)
# Return the offset
return ioBuf.index
