def bytes_to_bitmap(buf, maxitems, bitmap=None):
"""Convert string of bytes back into bitmap
This is the inverse of bytes_to_bitmap(), and is used to recover
the bitmap from its representation as string of bytes.
Parameters
----------
buf : bytes (str in Python 2)
[Compact] representation of bitmap as bytes. Result of
bitmap_to_bytes().
maxitems : int
Number of entries; number of bits in bitmap.
bitmap : BitMap, optional
Bitmap object to set. If provided, the bitmap must be empty
(all zeros), and have at least `maxitems` bits. This can be
used to avoid commit creation costs.
Returns
-------
BitMap
Bitmap / bitset with given representation.
"""
if not bitmap:
bitmap = BitMap(maxitems)
bitmap.bitmap = array.array('B', buf)
return bitmap
def test_reorganize_hash_file():
nbd.init(128)
logicService._g = logicService._logic_service()
# for i in BitMapIter(iter(bytearray([1, 0, 0, 2, 3, 4, 5]))):
# print(i)
with open('/tmp/test.bitmap', 'rb') as f:
_bit_map = f.read()
bit_map = BitMap()
bit_map.bitmap = bytearray(_bit_map)
snapshots = [{
"path":
"/home/mnt/nodes/ffccc08f7d5e40119e0440fd5845259c/images/c152ad459f4c4b39897bf0127c760f66/d3632a55450d4692a5d3021727975edf.qcow",
"ident": 'a3a1debbbe6f4c969fb0fe630d111199'
}]
disk_bytes = 105066964992
hash_name = '/tmp/hash.new'
# import os
# os.system('echo 3 > /proc/sys/vm/drop_caches;echo 3 > /proc/sys/vm/drop_caches')
ReorganizeHashFile(bit_map, snapshots, hash_name, hash_name + '.tmp',
disk_bytes).work()
MergeHash(disk_bytes).merge(hash_name + '.reg', [hash_name])
