text: import struct
  import typing
  import collections.abc
  import io
  
  from .etc import TypeSignature, DecodeError
  
  decoders = {}
  
  
  def register(decode_type: collections.abc.Sequence) -> typing.Callable:
      """
      simple decorator for type dispatch
      """
  
      def decorator(function):
          if decode_type in decoders:
              return function
          for types in decode_type:
              decoders[struct.unpack("<b", types)[0]] = function
          return function
  
      return decorator
  
  
  def read_name(stream: io.BytesIO):
      buffer = bytearray()
      while True:
          stream_read = stream.read(1)
          buffer.extend(stream_read)
          if buffer[-1] == 0:
              return buffer[0:-1].decode("utf-8")
          if stream_read == b"":
              raise DecodeError(f"Cannot Read Name : Buffer : {buffer} : Bytes Left : {stream.read()}")
  
  
  def read_length(stream: io.BytesIO) -> int:
      return struct.unpack("<i", stream.read(4))[0]
  
  
  def decode_element(element_type: int, stream: io.BytesIO):
      try:
          return decoders[element_type](stream)
      except LookupError:
          raise DecodeError(f"No decoder for : signature {element_type} :  Bytes Left : {stream.read()}")
  
  
  def decode_root_document(document: bytes):
      return decode_document(io.BytesIO(document))
  
  
  @register((TypeSignature.document,))
  def decode_document(stream: io.BytesIO) -> dict:
      length = read_length(stream)
      document = io.BytesIO(stream.read(length - 4))
      result = {}
      while True:
          element_type = struct.unpack("<b", document.read(1))[0]
          if element_type == 0:
              return result
          name = read_name(document)
          result[name] = decode_element(element_type, document)
  
  
  @register((TypeSignature.array,))
  def decode_array(stream: io.BytesIO) -> list:
      length = read_length(stream)
      document = io.BytesIO(stream.read(length - 4))
      result = []
      while True:
          element_type = struct.unpack("<b", document.read(1))[0]
          if element_type == 0:
              return result
          read_name(document)
          result.append(decode_element(element_type, document))
  
  
  @register((TypeSignature.string,))
  def decode_string(stream: io.BytesIO) -> str:
      string = stream.read(read_length(stream) - 1).decode("utf-8")
      stream.read(1)
      return string
  
  
  @register((TypeSignature.bool,))
  def decode_bool(stream: io.BytesIO) -> bool:
      return bool(struct.unpack("<b", stream.read(1))[0])
  
  
  @register((TypeSignature.int32,))
  def decode_int32(stream: io.BytesIO) -> int:
      return struct.unpack("<i", stream.read(4))[0]
  
  
  @register((TypeSignature.int64,))
  def decode_int64(stream: io.BytesIO) -> int:
      return struct.unpack("<q", stream.read(8))[0]
  
  
  @register((TypeSignature.uint64,))
  def decode_uint64(stream: io.BytesIO) -> int:
      return struct.unpack("<Q", stream.read(8))[0]
  
  
  @register((TypeSignature.double,))
  def decode_float(stream: io.BytesIO) -> float:
      return struct.unpack("<d", stream.read(8))[0]
  
  
  @register((TypeSignature.null,))
  def decode_none(stream: io.BytesIO) -> None:
      return None
  
  
  @register((TypeSignature.binary,))
  def decode_binary(stream: io.BytesIO) -> bytes:
      return stream.read(struct.unpack("<ib", stream.read(5))[0])
  