mirror of
https://github.com/basicswap/basicswap.git
synced 2025-11-06 02:38:11 +01:00
52 lines
1.4 KiB
Python
52 lines
1.4 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (c) 2024 tecnovert
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# Distributed under the MIT software license, see the accompanying
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# file LICENSE or http://www.opensource.org/licenses/mit-license.php.
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def decode_compactsize(b: bytes, offset: int = 0) -> (int, int):
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i = b[offset]
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if i < 0xFD:
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return i, 1
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offset += 1
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if i == 0xFD:
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return int.from_bytes(b[offset : offset + 2], "little"), 3
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if i == 0xFE:
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return int.from_bytes(b[offset : offset + 4], "little"), 5
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# 0xff
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return int.from_bytes(b[offset : offset + 8], "little"), 9
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def encode_compactsize(i: int) -> bytes:
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if i < 0xFD:
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return bytes((i,))
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if i <= 0xFFFF:
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return bytes((0xFD,)) + i.to_bytes(2, "little")
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if i <= 0xFFFFFFFF:
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return bytes((0xFE,)) + i.to_bytes(4, "little")
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return bytes((0xFF,)) + i.to_bytes(8, "little")
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def decode_varint(b: bytes, offset: int = 0) -> (int, int):
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i: int = 0
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num_bytes: int = 0
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while True:
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c = b[offset + num_bytes]
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i += (c & 0x7F) << (num_bytes * 7)
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num_bytes += 1
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if not c & 0x80:
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break
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if num_bytes > 8:
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raise ValueError("Too many bytes")
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return i, num_bytes
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def encode_varint(i: int) -> bytes:
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b = bytearray()
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while i > 0x7F:
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b += bytes(((i & 0x7F) | 0x80,))
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i = i >> 7
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b += bytes((i,))
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return b
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