1# Utilities for python-based QEMU tests 2# 3# Copyright 2024 Red Hat, Inc. 4# 5# Authors: 6# Thomas Huth <thuth@redhat.com> 7# 8# This work is licensed under the terms of the GNU GPL, version 2 or 9# later. See the COPYING file in the top-level directory. 10 11import os 12 13""" 14Round up to next power of 2 15""" 16def pow2ceil(x): 17 return 1 if x == 0 else 2**(x - 1).bit_length() 18 19def file_truncate(path, size): 20 if size != os.path.getsize(path): 21 with open(path, 'ab+') as fd: 22 fd.truncate(size) 23 24""" 25Expand file size to next power of 2 26""" 27def image_pow2ceil_expand(path): 28 size = os.path.getsize(path) 29 size_aligned = pow2ceil(size) 30 if size != size_aligned: 31 with open(path, 'ab+') as fd: 32 fd.truncate(size_aligned) 33