Migrate to new project structure.

libp2p/stream_muxer/mplex/utils.py

@@ -0,0 +1,44 @@
+import asyncio
+import struct
+
+
+def encode_uvarint(number):
+    """Pack `number` into varint bytes"""
+    buf = b''
+    while True:
+        towrite = number & 0x7f
+        number >>= 7
+        if number:
+            buf += bytes((towrite | 0x80, ))
+        else:
+            buf += bytes((towrite, ))
+            break
+    return buf
+
+
+def decode_uvarint(buff, index):
+    shift = 0
+    result = 0
+    while True:
+        i = buff[index]
+        result |= (i & 0x7f) << shift
+        shift += 7
+        if not i & 0x80:
+            break
+        index += 1
+
+    return result, index + 1
+
+
+async def decode_uvarint_from_stream(reader):
+    shift = 0
+    result = 0
+    while True:
+        byte = await asyncio.wait_for(reader.read(1), timeout=5)
+        i = struct.unpack('>H', b'\x00' + byte)[0]
+        result |= (i & 0x7f) << shift
+        shift += 7
+        if not i & 0x80:
+            break
+
+    return result