sprout42 /
StarStruct
| @@ 16-41 (lines=26) @@ | ||
| 13 | The length StarStruct element class. |
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| 14 | """ |
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| 15 | ||
| 16 | def __init__(self, field, mode=Mode.Native, alignment=1): |
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| 17 | """Initialize a StarStruct element object.""" |
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| 18 | ||
| 19 | # All of the type checks have already been performed by the class |
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| 20 | # factory |
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| 21 | if isinstance(field[0], str): |
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| 22 | self.name = field[0] |
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| 23 | self.object_length = True |
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| 24 | elif isinstance(field[0], bytes): |
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| 25 | self.name = field[0].decode('utf-8') |
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| 26 | self.object_length = False |
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| 27 | ||
| 28 | self.ref = field[2] |
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| 29 | ||
| 30 | self._mode = mode |
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| 31 | self._alignment = alignment |
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| 32 | ||
| 33 | # Validate that the format specifiers are valid struct formats, this |
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| 34 | # doesn't have to be done now because the format will be checked when |
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| 35 | # any struct functions are called, but it's better to inform the user of |
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| 36 | # any errors earlier. |
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| 37 | # The easiest way to perform this check is to create a "Struct" class |
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| 38 | # instance, this will also increase the efficiency of all struct related |
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| 39 | # functions called. |
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| 40 | self.format = mode.value + field[1] |
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| 41 | self._struct = struct.Struct(self.format) |
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| 42 | ||
| 43 | @staticmethod |
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| 44 | def valid(field): |
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| @@ 95-117 (lines=23) @@ | ||
| 92 | packed_struct = example_struct.make(my_data) |
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| 93 | ||
| 94 | """ |
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| 95 | ||
| 96 | def __init__(self, field, mode=Mode.Native, alignment=1): |
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| 97 | """Initialize a StarStruct element object.""" |
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| 98 | ||
| 99 | # TODO: Add checks in the class factory? |
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| 100 | self.name = field[0] |
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| 101 | ||
| 102 | # the ref attribute is required, but this element doesn't quite have |
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| 103 | # one, instead use the ref field to hold the fixed point format |
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| 104 | # attributes |
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| 105 | self.ref = {} |
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| 106 | ||
| 107 | self.ref['precision'] = field[3] |
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| 108 | ||
| 109 | if len(field) == 5: |
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| 110 | self.ref['decimal_prec'] = field[4] |
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| 111 | else: |
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| 112 | self.ref['decimal_prec'] = None |
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| 113 | ||
| 114 | self._mode = mode |
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| 115 | self._alignment = alignment |
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| 116 | ||
| 117 | self.format = mode.value + field[2] |
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| 118 | self._struct = struct.Struct(self.format) |
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| 119 | ||
| 120 | @staticmethod |
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