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test/functional/test_framework/compressor.py
58 строк
1 KB
Sebastian Falbesoner
test: introduce output amount (de)compression routines
04 мар 2025, 20:50
04 мар 2025, 20:50
b34fdb5
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#!/usr/bin/env python3 # Copyright (c) 2025-present The Bitcoin Core developers # Distributed under the MIT software license, see the accompanying # file COPYING or http://www.opensource.org/licenses/mit-license.php. """Routines for compressing transaction output amounts and scripts.""" import unittest from .messages import COIN def compress_amount(n): if n == 0: return 0 e = 0 while ((n % 10) == 0) and (e < 9): n //= 10 e += 1 if e < 9: d = n % 10 assert (d >= 1 and d <= 9) n //= 10 return 1 + (n*9 + d - 1)*10 + e else: return 1 + (n - 1)*10 + 9 def decompress_amount(x): if x == 0: return 0 x -= 1 e = x % 10 x //= 10 n = 0 if e < 9: d = (x % 9) + 1 x //= 9 n = x * 10 + d else: n = x + 1 while e > 0: n *= 10 e -= 1 return n class TestFrameworkCompressor(unittest.TestCase): def test_amount_compress_decompress(self): def check_amount(amount, expected_compressed): self.assertEqual(compress_amount(amount), expected_compressed) self.assertEqual(decompress_amount(expected_compressed), amount) # test cases from compress_tests.cpp:compress_amounts check_amount(0, 0x0) check_amount(1, 0x1) check_amount(1000000, 0x7) check_amount(COIN, 0x9) check_amount(50*COIN, 0x32) check_amount(21000000*COIN, 0x1406f40)