2020-07-13 11:57:36 +00:00
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from trezor.utils import BufferReader
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2020-06-24 12:25:48 +00:00
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2020-07-13 11:57:36 +00:00
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from apps.common.readers import read_bitcoin_varint
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2020-06-24 12:25:48 +00:00
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2020-07-13 11:57:36 +00:00
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2021-03-19 20:22:30 +00:00
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def read_memoryview_prefixed(r: BufferReader) -> memoryview:
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2020-06-24 12:25:48 +00:00
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n = read_bitcoin_varint(r)
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2021-03-19 20:22:30 +00:00
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return r.read_memoryview(n)
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2020-06-24 12:25:48 +00:00
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2020-07-13 11:57:36 +00:00
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def read_op_push(r: BufferReader) -> int:
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2020-06-24 12:25:48 +00:00
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prefix = r.get()
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if prefix < 0x4C:
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n = prefix
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elif prefix == 0x4C:
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n = r.get()
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elif prefix == 0x4D:
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n = r.get()
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n += r.get() << 8
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elif prefix == 0x4E:
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n = r.get()
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n += r.get() << 8
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n += r.get() << 16
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n += r.get() << 24
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else:
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raise ValueError
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return n
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