Allow multiple base58 prefix bytes.

basicswap/util/integer.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2024 tecnovert
+# Distributed under the MIT software license, see the accompanying
+# file LICENSE or http://www.opensource.org/licenses/mit-license.php.
+
+
+def decode_varint(b: bytes) -> int:
+    i = 0
+    shift = 0
+    for c in b:
+        i += (c & 0x7F) << shift
+        shift += 7
+    return i
+
+
+def encode_varint(i: int) -> bytes:
+    b = bytearray()
+    while i > 0x7F:
+        b += bytes(((i & 0x7F) | 0x80,))
+        i = (i >> 7)
+    b += bytes((i,))
+    return b