mirror of
https://github.com/trezor/trezor-firmware.git
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79 lines
1.8 KiB
Python
79 lines
1.8 KiB
Python
from trezor.utils import ensure
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def empty_bytearray(preallocate: int) -> bytearray:
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"""
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Returns bytearray that won't allocate for at least `preallocate` bytes.
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Useful in case you want to avoid allocating too often.
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"""
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b = bytearray(preallocate)
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b[:] = bytes()
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return b
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def write_uint8(w: bytearray, n: int) -> int:
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ensure(0 <= n <= 0xFF)
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w.append(n)
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return 1
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def write_uint16_le(w: bytearray, n: int) -> int:
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ensure(0 <= n <= 0xFFFF)
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w.append(n & 0xFF)
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w.append((n >> 8) & 0xFF)
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return 2
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def write_uint32_le(w: bytearray, n: int) -> int:
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ensure(0 <= n <= 0xFFFFFFFF)
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w.append(n & 0xFF)
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w.append((n >> 8) & 0xFF)
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w.append((n >> 16) & 0xFF)
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w.append((n >> 24) & 0xFF)
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return 4
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def write_uint32_be(w: bytearray, n: int) -> int:
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ensure(0 <= n <= 0xFFFFFFFF)
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w.append((n >> 24) & 0xFF)
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w.append((n >> 16) & 0xFF)
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w.append((n >> 8) & 0xFF)
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w.append(n & 0xFF)
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return 4
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def write_uint64_le(w: bytearray, n: int) -> int:
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ensure(0 <= n <= 0xFFFFFFFFFFFFFFFF)
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w.append(n & 0xFF)
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w.append((n >> 8) & 0xFF)
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w.append((n >> 16) & 0xFF)
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w.append((n >> 24) & 0xFF)
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w.append((n >> 32) & 0xFF)
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w.append((n >> 40) & 0xFF)
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w.append((n >> 48) & 0xFF)
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w.append((n >> 56) & 0xFF)
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return 8
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def write_uint64_be(w: bytearray, n: int) -> int:
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ensure(0 <= n <= 0xFFFFFFFFFFFFFFFF)
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w.append((n >> 56) & 0xFF)
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w.append((n >> 48) & 0xFF)
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w.append((n >> 40) & 0xFF)
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w.append((n >> 32) & 0xFF)
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w.append((n >> 24) & 0xFF)
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w.append((n >> 16) & 0xFF)
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w.append((n >> 8) & 0xFF)
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w.append(n & 0xFF)
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return 8
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def write_bytes(w: bytearray, b: bytes) -> int:
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w.extend(b)
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return len(b)
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def write_bytes_reversed(w: bytearray, b: bytes) -> int:
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w.extend(bytes(reversed(b)))
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return len(b)
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