mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-12 10:39:00 +00:00
112 lines
2.6 KiB
Python
112 lines
2.6 KiB
Python
from trezor.utils import ensure
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if False:
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from trezor.utils import Writer
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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: Writer, 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: Writer, 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_uint16_be(w: Writer, n: int) -> int:
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ensure(0 <= n <= 0xFFFF)
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w.append((n >> 8) & 0xFF)
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w.append(n & 0xFF)
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return 2
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def write_uint32_le(w: Writer, n: int) -> int:
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ensure(0 <= n <= 0xFFFF_FFFF)
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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: Writer, n: int) -> int:
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ensure(0 <= n <= 0xFFFF_FFFF)
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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: Writer, n: int) -> int:
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ensure(0 <= n <= 0xFFFF_FFFF_FFFF_FFFF)
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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: Writer, n: int) -> int:
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ensure(0 <= n <= 0xFFFF_FFFF_FFFF_FFFF)
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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_unchecked(w: Writer, b: bytes) -> int:
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w.extend(b)
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return len(b)
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def write_bytes_fixed(w: Writer, b: bytes, length: int) -> int:
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ensure(len(b) == length)
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w.extend(b)
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return length
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def write_bytes_reversed(w: Writer, b: bytes, length: int) -> int:
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ensure(len(b) == length)
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w.extend(bytes(reversed(b)))
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return length
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def write_bitcoin_varint(w: Writer, n: int) -> None:
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ensure(n >= 0 and n <= 0xFFFF_FFFF)
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if n < 253:
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w.append(n & 0xFF)
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elif n < 0x1_0000:
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w.append(253)
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w.append(n & 0xFF)
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w.append((n >> 8) & 0xFF)
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else:
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w.append(254)
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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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