Host-customized fork of https://github.com/tecnovert/basicswap/
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51 lines
1.4 KiB
51 lines
1.4 KiB
# -*- 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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