Coverage for d7a/alp/operands/offset.py: 100%

19 statements  

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1# 

2# Copyright (c) 2015-2021 University of Antwerp, Aloxy NV. 

3# 

4# This file is part of pyd7a. 

5# See https://github.com/Sub-IoT/pyd7a for further info. 

6# 

7# Licensed under the Apache License, Version 2.0 (the "License"); 

8# you may not use this file except in compliance with the License. 

9# You may obtain a copy of the License at 

10# 

11# http://www.apache.org/licenses/LICENSE-2.0 

12# 

13# Unless required by applicable law or agreed to in writing, software 

14# distributed under the License is distributed on an "AS IS" BASIS, 

15# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 

16# See the License for the specific language governing permissions and 

17# limitations under the License. 

18# 

19import struct 

20 

21from d7a.alp.operands.length import Length 

22from d7a.support.schema import Validatable, Types 

23 

24 

25class Offset(Validatable): 

26 

27 SCHEMA = [ 

28 { 

29 "id" : Types.BYTE(), 

30 "offset": Types.OBJECT(Length) 

31 } 

32 ] 

33 

34 def __init__(self, id=0, offset=Length()): 

35 self.id = id 

36 self.offset = offset 

37 super(Offset, self).__init__() 

38 

39 @staticmethod 

40 def parse(s): 

41 id = s.read("uint:8") 

42 offset = Length.parse(s) 

43 return Offset(id=id, offset=offset) 

44 

45 def __iter__(self): 

46 yield self.id 

47 for byte in self.offset: yield byte 

48 

49 def __str__(self): 

50 return "file-id={}, offset={}".format(self.id, self.offset)