(wire_type, format)
return SpecificEncoder
Return a constructor for an encoder for float fields.

  This is like StructPackEncoder, but catches errors that may be due to
  passing non-finite floating-point values to struct.pack, and makes a
  second attempt to encode those values.

  Args:
      wire_type:  The field's wire type, for encoding tags.
      format:  The format string to pass to struct.pack().
Return a constructor for an encoder for float fields.
Return a constructor for an encoder for float fields .
def _FloatingPointEncoder(wire_type, format):
  """Return a constructor for an encoder for float fields.

  This is like StructPackEncoder, but catches errors that may be due to
  passing non-finite floating-point values to struct.pack, and makes a
  second attempt to encode those values.

  Args:
      wire_type:  The field's wire type, for encoding tags.
      format:  The format string to pass to struct.pack().
  """

  value_size = struct.calcsize(format)
  if value_size == 4:
    def EncodeNonFiniteOrRaise(write, value):
      # Remember that the serialized form uses little-endian byte order.
      if value == _POS_INF:
        write(b'\x00\x00\x80\x7F')
      elif value == _NEG_INF:
        write(b'\x00\x00\x80\xFF')
      elif value != value:           # NaN
        write(b'\x00\x00\xC0\x7F')
      else:
        raise
  elif value_size == 8:
    def EncodeNonFiniteOrRaise(write, value):
      if value == _POS_INF:
        write(b'\x00\x00\x00\x00\x00\x00\xF0\x7F')
      elif value == _NEG_INF:
        write(b'\x00\x00\x00\x00\x00\x00\xF0\xFF')
      elif value != value:                         # NaN
        write(b'\x00\x00\x00\x00\x00\x00\xF8\x7F')
      else:
        raise
  else:
    raise ValueError('Can\'t encode floating-point values that are '
                     '%d bytes long (only 4 or 8)' % value_size)

  def SpecificEncoder(field_number, is_repeated, is_packed):
    local_struct_pack = struct.pack
    if is_packed:
      tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
      local_EncodeVarint = _EncodeVarint
      def EncodePackedField(write, value):
        write(tag_bytes)
        local_EncodeVarint(write, len(value) * value_size)
        for element in value:
          # This try/except block is going to be faster than any code that
          # we could write to check whether element is finite.
          try:
            write(local_struct_pack(format, element))
          except SystemError:
            EncodeNonFiniteOrRaise(write, element)
      return EncodePackedField
    elif is_repeated:
      tag_bytes = TagBytes(field_number, wire_type)
      def EncodeRepeatedField(write, value):
        for element in value:
          write(tag_bytes)
          try:
            write(local_struct_pack(format, element))
          except SystemError:
            EncodeNonFiniteOrRaise(write, element)
      return EncodeRepeatedField
    else:
      tag_bytes = TagBytes(field_number, wire_type)
      def EncodeField(write, value):
        write(tag_bytes)
        try:
          write(local_struct_pack(format, value))
        except SystemError:
          EncodeNonFiniteOrRaise(write, value)
      return EncodeField

  return SpecificEncoder
def _FloatingPointEncoder ( wire_type , format ) : value_size = struct . calcsize ( format ) if value_size == 4 : def EncodeNonFiniteOrRaise ( write , value ) : # Remember that the serialized form uses little-endian byte order. if value == _POS_INF : write ( b'\x00\x00\x80\x7F' ) elif value == _NEG_INF : write ( b'\x00\x00\x80\xFF' ) elif value != value : # NaN write ( b'\x00\x00\xC0\x7F' ) else : raise elif value_size == 8 : def EncodeNonFiniteOrRaise ( write , value ) : if value == _POS_INF : write ( b'\x00\x00\x00\x00\x00\x00\xF0\x7F' ) elif value == _NEG_INF : write ( b'\x00\x00\x00\x00\x00\x00\xF0\xFF' ) elif value != value : # NaN write ( b'\x00\x00\x00\x00\x00\x00\xF8\x7F' ) else : raise else : raise ValueError ( 'Can\'t encode floating-point values that are ' '%d bytes long (only 4 or 8)' % value_size ) def SpecificEncoder ( field_number , is_repeated , is_packed ) : local_struct_pack = struct . pack if is_packed : tag_bytes = TagBytes ( field_number , wire_format . WIRETYPE_LENGTH_DELIMITED ) local_EncodeVarint = _EncodeVarint def EncodePackedField ( write , value ) : write ( tag_bytes ) local_EncodeVarint ( write , len ( value ) * value_size ) for element in value : # This try/except block is going to be faster than any code that # we could write to check whether element is finite. try : write ( local_struct_pack ( format , element ) ) except SystemError : EncodeNonFiniteOrRaise ( write , element ) return EncodePackedField elif is_repeated : tag_bytes = TagBytes ( field_number , wire_type ) def EncodeRepeatedField ( write , value ) : for element in value : write ( tag_bytes ) try : write ( local_struct_pack ( format , element ) ) except SystemError : EncodeNonFiniteOrRaise ( write , element ) return EncodeRepeatedField else : tag_bytes = TagBytes ( field_number , wire_type ) def EncodeField ( write , value ) : write ( tag_bytes ) try : write ( local_struct_pack ( format , value ) ) except SystemError : EncodeNonFiniteOrRaise ( write , value ) return EncodeField return SpecificEncoder