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# -*- coding: utf-8 -*-
from __future__ import absolute_import
try:
# python 3 support
import cPickle as pickle
except ImportError:
import pickle
from .Utils import deunicodise
class HashCache(object):
def __init__(self):
self.inodes = dict()
def add(self, dev, inode, mtime, size, md5):
if dev == 0 or inode == 0: return # Windows
if dev not in self.inodes:
self.inodes[dev] = dict()
if inode not in self.inodes[dev]:
self.inodes[dev][inode] = dict()
self.inodes[dev][inode][mtime] = dict(md5=md5, size=size)
def md5(self, dev, inode, mtime, size):
try:
d = self.inodes[dev][inode][mtime]
if d['size'] != size:
return None
except Exception:
return None
return d['md5']
def mark_all_for_purge(self):
for d in tuple(self.inodes):
for i in tuple(self.inodes[d]):
for c in tuple(self.inodes[d][i]):
self.inodes[d][i][c]['purge'] = True
def unmark_for_purge(self, dev, inode, mtime, size):
try:
d = self.inodes[dev][inode][mtime]
except KeyError:
return
if d['size'] == size and 'purge' in d:
del self.inodes[dev][inode][mtime]['purge']
def purge(self):
for d in tuple(self.inodes):
for i in tuple(self.inodes[d]):
for m in tuple(self.inodes[d][i]):
if 'purge' in self.inodes[d][i][m]:
del self.inodes[d][i]
break
def save(self, f):
d = dict(inodes=self.inodes, version=1)
with open(deunicodise(f), 'wb') as fp:
pickle.dump(d, fp)
def load(self, f):
with open(deunicodise(f), 'rb') as fp:
d = pickle.load(fp)
if d.get('version') == 1 and 'inodes' in d:
self.inodes = d['inodes']