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format_hash() should not consume unbounded memory

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Kovid Goyal 2011-06-22 16:11:53 -06:00
parent 8da8075ee2
commit a94b78cfed
1 changed files with 8 additions and 3 deletions
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11
src/calibre/library/database2.py
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@ -1132,11 +1132,16 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
return ans
def format_hash(self, id_, fmt):
data = self.format(id_, fmt, index_is_id=True)
if data is None:
path = self.format_abspath(id_, fmt, index_is_id=True)
if path is None:
raise NoSuchFormat('Record %d has no fmt: %s'%(id_, fmt))
sha = hashlib.sha256()
sha.update(data)
with lopen(path, 'rb') as f:
while True:
raw = f.read(SPOOL_SIZE)
sha.update(raw)
if len(raw) < SPOOL_SIZE:
break
return sha.hexdigest()
def format_abspath(self, index, format, index_is_id=False):