def buttonClicked_3(self):
p = int(unicode(self.lineEdit_8.text()))
q = int(unicode(self.lineEdit_9.text()))
n = p * q
self.textBrowser_3.append("p = {0}, q = {1}, n = {2}".format(p, q, n))
input = self.plainTextEdit_3.toPlainText()
self.textBrowser_3.append("Text lenght: {0}".format(len(input)))
if self.radioButton_5.isChecked() is True:
[time, output] = rabin.rabin(unicode(input), 1, p, q)
self.textBrowser_3.append("Encoded text: {0}".format(
str(unicode(output))))
self.textBrowser_3.append("Time elapsed: {0} s<br>".format(
str(unicode(time))))
if self.radioButton_6.isChecked() is True:
[time, a, b, c, d] = rabin.rabin(unicode(input), 0, p, q)
self.textBrowser_3.append("Decoded text:")
self.textBrowser_3.append("{0}".format(str(unicode(a))))
self.textBrowser_3.append("{0}".format(str(unicode(b))))
self.textBrowser_3.append("{0}".format(str(unicode(c))))
self.textBrowser_3.append("{0}".format(str(unicode(d))))
self.textBrowser_3.append("Time elapsed: {0} s<br>".format(time))
#!/usr/bin/python
# -*- coding: utf-8 -*-
from rabin import rabin
print rabin("testfile")
def __init__(self):
self.des = DES()
self.rabin = rabin()
def backup(backend, src, tag="default"):
# Try to load old metadata from latest backup
old_backups = backend.list(prefix="b-*")
old_meta_data = {}
if old_backups:
backup_id = utils.newest_backup_id(old_backups)
om = backend.get(backup_id)
try:
old_meta_data = json.loads(om)
except ValueError:
pass
start_time = datetime.now().strftime("%Y-%m-%d-%H-%M-%S")
path = os.path.expanduser(src)
files = utils.find_modified_files(path)
chunk_size = chunk_count = changed_bytes = 0
for filename, meta in files.items():
# Assume file is unchanged if neither mtime nor size is changed
old = old_meta_data.get(unicode(filename, 'utf-8'))
if old and old['m'] == meta['m'] and old['s'] == meta['s']:
old_checksum = old.get('c')
if old_checksum:
meta['c'] = old_checksum
logging.info("Skipped unchanged %s" % filename)
continue
fullname = os.path.join(path, filename)
if not S_ISREG(meta['p']): # not a file
continue
my_sha256 = hashlib.sha256()
chunk_checksums = []
try:
chunks = rabin(fullname)
except IOError:
logging.warning("%s not found, skipping" % fullname)
continue
with open(fullname) as infile:
for chunksize in chunks:
data = infile.read(chunksize)
my_sha256.update(data)
chunk_checksum = utils.sha256_string(data)
name = "c-%s" % chunk_checksum
chunk_checksums.append(chunk_checksum)
stored = backend.put(name, data)
changed_bytes += len(data)
if stored:
chunk_size += len(data)
chunk_count += 1
if len(chunk_checksums) > 1:
checksum = my_sha256.hexdigest()
name = "o-%s" % checksum
backend.put(name, ';'.join(chunk_checksums))
else:
name = "c-%s" % chunk_checksums[0]
meta['c'] = name
logging.info(fullname)
# write backup summary
meta_data = json.dumps(files)
suffix = ''.join(random.choice(ascii_letters + digits) for _ in range(8))
backup_id = "b-%s-%s-%s" % (tag, start_time, suffix)
backend.put(backup_id, meta_data)
logging.info("Finished backup %s. %s bytes changed" % (
backup_id, changed_bytes))
logging.info("Stored %s new objects with a total size of %s bytes" % (
chunk_count, chunk_size))
return backup_id
