Mercurial > public > bitcaviar-plus
comparison src/puppy/helpers.py @ 8:4d259e84160d
fix OverFlow bug
| author | Dennis Concepcion Martin <dennisconcepcionmartin@gmail.com> |
|---|---|
| date | Sun, 24 Oct 2021 17:38:23 +0200 |
| parents | |
| children | e218f70e19e9 |
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| 7:e4afde8d5a7e | 8:4d259e84160d |
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| 1 import hashlib | |
| 2 | |
| 3 """ | |
| 4 Helper methods | |
| 5 """ | |
| 6 | |
| 7 | |
| 8 def get_var_int(f): | |
| 9 """ | |
| 10 A VarInt (variable integer) is a field used in transaction data to indicate the number of upcoming fields, | |
| 11 or the length of an upcoming field. | |
| 12 More info: https://learnmeabitcoin.com/technical/varint | |
| 13 :param f: buffer, required | |
| 14 :return: string | |
| 15 """ | |
| 16 | |
| 17 prefix = f.read(1).hex() | |
| 18 | |
| 19 if int(prefix, 16) == 253: | |
| 20 number_of_transactions = f.read(2)[::-1].hex() | |
| 21 elif int(prefix, 16) == 254: | |
| 22 number_of_transactions = f.read(4)[::-1].hex() | |
| 23 elif int(prefix, 16) == 255: | |
| 24 number_of_transactions = f.read(8)[::-1].hex() | |
| 25 else: | |
| 26 number_of_transactions = prefix | |
| 27 | |
| 28 return number_of_transactions | |
| 29 | |
| 30 | |
| 31 def compute_hash(data): | |
| 32 """ | |
| 33 Get hash | |
| 34 :param data: bytes, required | |
| 35 :return: string | |
| 36 """ | |
| 37 | |
| 38 h = hashlib.sha256(data).digest() | |
| 39 h = hashlib.sha256(h).digest() | |
| 40 | |
| 41 return h[::-1].hex() |