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TrueTypeFont: Check for enough data to unpack 

Fixes https://github.com/euske/pdfminer/issues/96
and https://github.com/euske/pdfminer/issues/144.
pull/96/head
Sebastian Schuberth 2017-10-16 11:46:08 +02:00 committed by Sebastian Schuberth
parent d4118cf5e8
commit 39428fb4f0
1 changed files with 8 additions and 2 deletions
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10
pdfminer/pdffont.py
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@ -383,9 +383,15 @@ class TrueTypeFont(object):
self.fp = fp
self.tables = {}
self.fonttype = fp.read(4)
(ntables, _1, _2, _3) = struct.unpack('>HHHH', fp.read(8))
data_str = fp.read(8)
if len(data_str) != 8:
return
(ntables, _1, _2, _3) = struct.unpack('>HHHH', data_str)
for _ in range(ntables):
(name, tsum, offset, length) = struct.unpack('>4sLLL', fp.read(16))
data_str = fp.read(16)
if len(data_str) != 16:
return
(name, tsum, offset, length) = struct.unpack('>4sLLL', data_str)
self.tables[name] = (offset, length)
return