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Restoring bad exif handling

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This commit is contained in:
wiredfool 2015-09-11 10:45:10 -07:00
parent 47a963c2a4
commit 5f9fff0215
2 changed files with 56 additions and 42 deletions
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90
PIL/TiffImagePlugin.py
View File

@ -468,55 +468,67 @@ class ImageFileDirectory_v2(collections.MutableMapping):
return b"".join(self._pack("2L", *_limit_rational(frac, 2 ** 30))
for frac in values)
def _ensure_read(self, fp, size):
ret = fp.read(size)
if len(ret) != size:
raise IOError("Corrupt EXIF data. " +
"Expecting to read %d bytes but only got %d. " %
(size, len(ret)))
return ret
def load(self, fp):
self.reset()
self._offset = fp.tell()
for i in range(self._unpack("H", fp.read(2))[0]):
tag, typ, count, data = self._unpack("HHL4s", fp.read(12))
if DEBUG:
tagname = TAGS.get(tag, TagInfo()).name
typname = TYPES.get(typ, "unknown")
print("tag: %s (%d) - type: %s (%d)" %
(tagname, tag, typname, typ), end=" ")
try:
unit_size, handler = self._load_dispatch[typ]
except KeyError:
try:
for i in range(self._unpack("H", self._ensure_read(fp,2))[0]):
tag, typ, count, data = self._unpack("HHL4s", self._ensure_read(fp,12))
if DEBUG:
print("- unsupported type", typ)
continue # ignore unsupported type
size = count * unit_size
if size > 4:
here = fp.tell()
offset, = self._unpack("L", data)
if DEBUG:
print("Tag Location: %s - Data Location: %s" %
(here, offset), end=" ")
fp.seek(offset)
data = ImageFile._safe_read(fp, size)
fp.seek(here)
else:
data = data[:size]
tagname = TAGS.get(tag, TagInfo()).name
typname = TYPES.get(typ, "unknown")
print("tag: %s (%d) - type: %s (%d)" %
(tagname, tag, typname, typ), end=" ")
if len(data) != size:
warnings.warn("Possibly corrupt EXIF data. "
"Expecting to read %d bytes but only got %d. "
"Skipping tag %s" % (size, len(data), tag))
continue
self._tagdata[tag] = data
self.tagtype[tag] = typ
if DEBUG:
if size > 32:
print("- value: <table: %d bytes>" % size)
try:
unit_size, handler = self._load_dispatch[typ]
except KeyError:
if DEBUG:
print("- unsupported type", typ)
continue # ignore unsupported type
size = count * unit_size
if size > 4:
here = fp.tell()
offset, = self._unpack("L", data)
if DEBUG:
print("Tag Location: %s - Data Location: %s" %
(here, offset), end=" ")
fp.seek(offset)
data = ImageFile._safe_read(fp, size)
fp.seek(here)
else:
print("- value:", self[tag])
data = data[:size]
self.next, = self._unpack("L", fp.read(4))
if len(data) != size:
warnings.warn("Possibly corrupt EXIF data. "
"Expecting to read %d bytes but only got %d. "
"Skipping tag %s" % (size, len(data), tag))
continue
self._tagdata[tag] = data
self.tagtype[tag] = typ
if DEBUG:
if size > 32:
print("- value: <table: %d bytes>" % size)
else:
print("- value:", self[tag])
self.next, = self._unpack("L", self._ensure_read(fp,4))
except IOError as msg:
warnings.warn(str(msg))
return
def save(self, fp):
if fp.tell() == 0: # skip TIFF header on subsequent pages

8
Tests/test_file_tiff.py
View File

@ -99,9 +99,11 @@ class TestFileTiff(PillowTestCase):
lambda: TiffImagePlugin.TiffImageFile(invalid_file))
def test_bad_exif(self):
image = Image.open('Tests/images/hopper_bad_exif.jpg')
image._getexif()
self.assertRaises(Exception, image._getexif)
try:
Image.open('Tests/images/hopper_bad_exif.jpg')._getexif()
except struct.error:
self.fail(
"Bad EXIF data passed incorrect values to _binary unpack")
def test_save_unsupported_mode(self):
im = hopper("HSV")