# Source code for fontTools.misc.macRes

    from io import BytesIO
    import struct
    from fontTools.misc import sstruct
    from fontTools.misc.textTools import bytesjoin, tostr
    from collections import OrderedDict
    from collections.abc import MutableMapping

    class ResourceError(Exception):
    	pass

    class ResourceReader(MutableMapping):
    	"""Reader for Mac OS resource forks.

    	Parses a resource fork and returns resources according to their type.
    	If run on OS X, this will open the resource fork in the filesystem.
    	Otherwise, it will open the file itself and attempt to read it as
    	though it were a resource fork.

    	The returned object can be indexed by type and iterated over,
    	returning in each case a list of py:class:`Resource` objects
    	representing all the resources of a certain type.

    	"""
    	def __init__(self, fileOrPath):
    		"""Open a file

    		Args:
    			fileOrPath: Either an object supporting a ``read`` method, an
    				``os.PathLike`` object, or a string.
    		"""
    		self._resources = OrderedDict()
    		if hasattr(fileOrPath, 'read'):
    			self.file = fileOrPath
    		else:
    			try:
    				# try reading from the resource fork (only works on OS X)
    				self.file = self.openResourceFork(fileOrPath)
    				self._readFile()
    				return
    			except (ResourceError, IOError):
    				# if it fails, use the data fork
    				self.file = self.openDataFork(fileOrPath)
    		self._readFile()

    	@staticmethod
    	def openResourceFork(path):
    		if hasattr(path, "__fspath__"):  # support os.PathLike objects
    			path = path.__fspath__()
    		with open(path + '/..namedfork/rsrc', 'rb') as resfork:
    			data = resfork.read()
    		infile = BytesIO(data)
    		infile.name = path
    		return infile

    	@staticmethod
    	def openDataFork(path):
    		with open(path, 'rb') as datafork:
    			data = datafork.read()
    		infile = BytesIO(data)
    		infile.name = path
    		return infile

    	def _readFile(self):
    		self._readHeaderAndMap()
    		self._readTypeList()

    	def _read(self, numBytes, offset=None):
    		if offset is not None:
    			try:
    				self.file.seek(offset)
    			except OverflowError:
    				raise ResourceError("Failed to seek offset ('offset' is too large)")
    			if self.file.tell() != offset:
    				raise ResourceError('Failed to seek offset (reached EOF)')
    		try:
    			data = self.file.read(numBytes)
    		except OverflowError:
    			raise ResourceError("Cannot read resource ('numBytes' is too large)")
    		if len(data) != numBytes:
    			raise ResourceError('Cannot read resource (not enough data)')
    		return data

    	def _readHeaderAndMap(self):
    		self.file.seek(0)
    		headerData = self._read(ResourceForkHeaderSize)
    		sstruct.unpack(ResourceForkHeader, headerData, self)
    		# seek to resource map, skip reserved
    		mapOffset = self.mapOffset + 22
    		resourceMapData = self._read(ResourceMapHeaderSize, mapOffset)
    		sstruct.unpack(ResourceMapHeader, resourceMapData, self)
    		self.absTypeListOffset = self.mapOffset + self.typeListOffset
    		self.absNameListOffset = self.mapOffset + self.nameListOffset

    	def _readTypeList(self):
    		absTypeListOffset = self.absTypeListOffset
    		numTypesData = self._read(2, absTypeListOffset)
    		self.numTypes, = struct.unpack('>H', numTypesData)
    		absTypeListOffset2 = absTypeListOffset + 2
    		for i in range(self.numTypes + 1):
    			resTypeItemOffset = absTypeListOffset2 + ResourceTypeItemSize * i
    			resTypeItemData = self._read(ResourceTypeItemSize, resTypeItemOffset)
    			item = sstruct.unpack(ResourceTypeItem, resTypeItemData)
    			resType = tostr(item['type'], encoding='mac-roman')
    			refListOffset = absTypeListOffset + item['refListOffset']
    			numRes = item['numRes'] + 1
    			resources = self._readReferenceList(resType, refListOffset, numRes)
    			self._resources[resType] = resources

    	def _readReferenceList(self, resType, refListOffset, numRes):
    		resources = []
    		for i in range(numRes):
    			refOffset = refListOffset + ResourceRefItemSize * i
    			refData = self._read(ResourceRefItemSize, refOffset)
    			res = Resource(resType)
    			res.decompile(refData, self)
    			resources.append(res)
    		return resources

    	def __getitem__(self, resType):
    		return self._resources[resType]

    	def __delitem__(self, resType):
    		del self._resources[resType]

    	def __setitem__(self, resType, resources):
    		self._resources[resType] = resources

    	def __len__(self):
    		return len(self._resources)

    	def __iter__(self):
    		return iter(self._resources)

    	def keys(self):
    		return self._resources.keys()

    	@property
    	def types(self):
    		"""A list of the types of resources in the resource fork."""
    		return list(self._resources.keys())

    	def countResources(self, resType):
    		"""Return the number of resources of a given type."""
    		try:
    			return len(self[resType])
    		except KeyError:
    			return 0

    	def getIndices(self, resType):
    		"""Returns a list of indices of resources of a given type."""
    		numRes = self.countResources(resType)
    		if numRes:
    			return list(range(1, numRes+1))
    		else:
    			return []

    	def getNames(self, resType):
    		"""Return list of names of all resources of a given type."""
    		return [res.name for res in self.get(resType, []) if res.name is not None]

    	def getIndResource(self, resType, index):
    		"""Return resource of given type located at an index ranging from 1
    		to the number of resources for that type, or None if not found.
    		"""
    		if index < 1:
    			return None
    		try:
    			res = self[resType][index-1]
    		except (KeyError, IndexError):
    			return None
    		return res

    	def getNamedResource(self, resType, name):
    		"""Return the named resource of given type, else return None."""
    		name = tostr(name, encoding='mac-roman')
    		for res in self.get(resType, []):
    			if res.name == name:
    				return res
    		return None

    	def close(self):
    		if not self.file.closed:
    			self.file.close()

    class Resource(object):
    	"""Represents a resource stored within a resource fork.

    	Attributes:
    		type: resource type.
    		data: resource data.
    		id: ID.
    		name: resource name.
    		attr: attributes.
    	"""

    	def __init__(self, resType=None, resData=None, resID=None, resName=None,
    			     resAttr=None):
    		self.type = resType
    		self.data = resData
    		self.id = resID
    		self.name = resName
    		self.attr = resAttr

    	def decompile(self, refData, reader):
    		sstruct.unpack(ResourceRefItem, refData, self)
    		# interpret 3-byte dataOffset as (padded) ULONG to unpack it with struct
    		self.dataOffset, = struct.unpack('>L', bytesjoin([b"\0", self.dataOffset]))
    		absDataOffset = reader.dataOffset + self.dataOffset
    		dataLength, = struct.unpack(">L", reader._read(4, absDataOffset))
    		self.data = reader._read(dataLength)
    		if self.nameOffset == -1:
    			return
    		absNameOffset = reader.absNameListOffset + self.nameOffset
    		nameLength, = struct.unpack('B', reader._read(1, absNameOffset))
    		name, = struct.unpack('>%ss' % nameLength, reader._read(nameLength))
    		self.name = tostr(name, encoding='mac-roman')

    ResourceForkHeader = """
    		> # big endian
    		dataOffset:     L
    		mapOffset:      L
    		dataLen:        L
    		mapLen:         L
    """

    ResourceForkHeaderSize = sstruct.calcsize(ResourceForkHeader)

    ResourceMapHeader = """
    		> # big endian
    		attr:              H
    		typeListOffset:    H
    		nameListOffset:    H
    """

    ResourceMapHeaderSize = sstruct.calcsize(ResourceMapHeader)

    ResourceTypeItem = """
    		> # big endian
    		type:              4s
    		numRes:            H
    		refListOffset:     H
    """

    ResourceTypeItemSize = sstruct.calcsize(ResourceTypeItem)

    ResourceRefItem = """
    		> # big endian
    		id:                h
    		nameOffset:        h
    		attr:              B
    		dataOffset:        3s
    		reserved:          L
    """

    ResourceRefItemSize = sstruct.calcsize(ResourceRefItem)