[utils] Move FileDownloader.parse_bytes into utils

yt_dlp/downloader/common.py

@@ -15,7 +15,6 @@ from ..minicurses import (
 from ..utils import (
     IDENTITY,
     NO_DEFAULT,
-    NUMBER_RE,
     LockingUnsupportedError,
     Namespace,
     RetryManager,
@@ -24,6 +23,7 @@ from ..utils import (
     encodeFilename,
     format_bytes,
     join_nonempty,
+    parse_bytes,
     remove_start,
     sanitize_open,
     shell_quote,
@@ -180,12 +180,7 @@ class FileDownloader:
     @staticmethod
     def parse_bytes(bytestr):
         """Parse a string indicating a byte quantity into an integer."""
-        matchobj = re.match(rf'(?i)^({NUMBER_RE})([kMGTPEZY]?)$', bytestr)
-        if matchobj is None:
-            return None
-        number = float(matchobj.group(1))
-        multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower())
-        return int(round(number * multiplier))
+        parse_bytes(bytestr)
 
     def slow_down(self, start_time, now, byte_counter):
         """Sleep if the download speed is over the rate limit."""