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52 lines
1.4 KiB
Python
52 lines
1.4 KiB
Python
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# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import absolute_import, division, print_function
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import construct
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import six
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class _UBInt24(construct.Adapter):
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def _encode(self, obj, context):
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return (
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six.int2byte((obj & 0xFF0000) >> 16) +
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six.int2byte((obj & 0x00FF00) >> 8) +
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six.int2byte(obj & 0x0000FF)
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)
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def _decode(self, obj, context):
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obj = bytearray(obj)
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return (obj[0] << 16 | obj[1] << 8 | obj[2])
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def UBInt24(name): # noqa
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return _UBInt24(construct.Bytes(name, 3))
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def LengthPrefixedArray(subcon, length_field=construct.UBInt8("length")):
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"""
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An array prefixed by a byte length field.
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In contrast to construct.macros.PrefixedArray,
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the length field signifies the number of bytes, not the number of elements.
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"""
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subcon_with_pos = construct.Struct(
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subcon.name,
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construct.Embed(subcon),
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construct.Anchor("__current_pos")
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)
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return construct.Embed(
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construct.Struct(
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"",
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length_field,
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construct.Anchor("__start_pos"),
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construct.RepeatUntil(
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lambda obj, ctx: obj.__current_pos == ctx.__start_pos + getattr(ctx, length_field.name),
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subcon_with_pos
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),
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)
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)
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