bifurctae read_bool_byte and write_bool_byte into _np_* and _py_* variants

fatamorgana/basic.py

@@ -125,8 +125,45 @@ def write_byte(stream: io.BufferedIOBase, n: int) -> int:
     return stream.write(bytes((n,)))
 
 
+def _py_read_bool_byte(stream: io.BufferedIOBase) -> List[bool]:
+    """
+    Read a single byte from the stream, and interpret its bits as
+      a list of 8 booleans.
+
+    Args:
+        stream: Stream to read from.
+
+    Returns:
+        A list of 8 booleans corresponding to the bits (MSB first).
+    """
+    byte = _read(stream, 1)[0]
+    bits = [bool((byte >> i) & 0x01) for i in reversed(range(8))]
+    return bits
+
+def _py_write_bool_byte(stream: io.BufferedIOBase, bits: Tuple[Union[bool, int], ...]) -> int:
+    """
+    Pack 8 booleans into a byte, and write it to the stream.
+
+    Args:
+        stream: Stream to write to.
+        bits: A list of 8 booleans corresponding to the bits (MSB first).
+
+    Returns:
+        Number of bytes written (1).
+
+    Raises:
+        InvalidDataError if didn't receive 8 bits.
+    """
+    if len(bits) != 8:
+        raise InvalidDataError('write_bool_byte received {} bits, requires 8'.format(len(bits)))
+    byte = 0
+    for i, bit in enumerate(reversed(bits)):
+        byte |= bit << i
+    return stream.write(bytes((byte,)))
+
+
 if _USE_NUMPY:
-    def read_bool_byte(stream: io.BufferedIOBase) -> List[bool]:
+    def _np_read_bool_byte(stream: io.BufferedIOBase) -> List[bool]:
         """
         Read a single byte from the stream, and interpret its bits as
           a list of 8 booleans.
@@ -140,7 +177,7 @@ if _USE_NUMPY:
         byte_arr = _read(stream, 1)
         return numpy.unpackbits(numpy.frombuffer(byte_arr, dtype=numpy.uint8))
 
-    def write_bool_byte(stream: io.BufferedIOBase, bits: Tuple[Union[bool, int], ...]) -> int:
+    def _np_write_bool_byte(stream: io.BufferedIOBase, bits: Tuple[Union[bool, int], ...]) -> int:
         """
         Pack 8 booleans into a byte, and write it to the stream.
 
@@ -157,43 +194,12 @@ if _USE_NUMPY:
         if len(bits) != 8:
             raise InvalidDataError('write_bool_byte received {} bits, requires 8'.format(len(bits)))
         return stream.write(numpy.packbits(bits)[0])
+
+    read_bool_byte = _np_read_bool_byte
+    write_bool_byte = _np_write_bool_byte
 else:
-    def read_bool_byte(stream: io.BufferedIOBase) -> List[bool]:
-        """
-        Read a single byte from the stream, and interpret its bits as
-          a list of 8 booleans.
-
-        Args:
-            stream: Stream to read from.
-
-        Returns:
-            A list of 8 booleans corresponding to the bits (MSB first).
-        """
-        byte = _read(stream, 1)[0]
-        bits = [bool((byte >> i) & 0x01) for i in reversed(range(8))]
-        return bits
-
-    def write_bool_byte(stream: io.BufferedIOBase, bits: Tuple[Union[bool, int], ...]) -> int:
-        """
-        Pack 8 booleans into a byte, and write it to the stream.
-
-        Args:
-            stream: Stream to write to.
-            bits: A list of 8 booleans corresponding to the bits (MSB first).
-
-        Returns:
-            Number of bytes written (1).
-
-        Raises:
-            InvalidDataError if didn't receive 8 bits.
-        """
-        if len(bits) != 8:
-            raise InvalidDataError('write_bool_byte received {} bits, requires 8'.format(len(bits)))
-        byte = 0
-        for i, bit in enumerate(reversed(bits)):
-            byte |= bit << i
-        return stream.write(bytes((byte)))
-
+    read_bool_byte = _py_read_bool_byte
+    write_bool_byte = _py_write_bool_byte
 
 def read_uint(stream: io.BufferedIOBase) -> int:
     """