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handle Photoshop chunks which can't be processed

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Alexander 2020-01-19 03:35:17 +03:00
parent 3841c96ec6
commit f55eb73934
1 changed files with 33 additions and 31 deletions
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64
src/PIL/JpegImagePlugin.py
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@ -101,37 +101,39 @@ def APP(self, marker):
# markers appear in the correct sequence.
self.icclist.append(s)
elif marker == 0xFFED and s[:14] == b"Photoshop 3.0\x00":
# parse the image resource block
offset = 14
photoshop = {}
while s[offset : offset + 4] == b"8BIM":
offset += 4
# resource code
try:
code = i16(s, offset)
except struct.error:
break
offset += 2
# resource name (usually empty)
name_len = i8(s[offset])
# name = s[offset+1:offset+1+name_len]
offset += 1 + name_len
offset += offset & 1 # align
# resource data block
size = i32(s, offset)
offset += 4
data = s[offset : offset + size]
if code == 0x03ED: # ResolutionInfo
data = {
"XResolution": i32(data[:4]) / 65536,
"DisplayedUnitsX": i16(data[4:8]),
"YResolution": i32(data[8:12]) / 65536,
"DisplayedUnitsY": i16(data[12:]),
}
photoshop[code] = data
offset += size
offset += offset & 1 # align
self.info["photoshop"] = photoshop
# Process this marker only if previous were empty
if not self.info.get("photoshop"):
# parse the image resource block
offset = 14
photoshop = {}
while s[offset : offset + 4] == b"8BIM":
try:
offset += 4
# resource code
code = i16(s, offset)
offset += 2
# resource name (usually empty)
name_len = i8(s[offset])
# name = s[offset+1:offset+1+name_len]
offset += 1 + name_len
offset += offset & 1 # align
# resource data block
size = i32(s, offset)
offset += 4
data = s[offset : offset + size]
if code == 0x03ED: # ResolutionInfo
data = {
"XResolution": i32(data[:4]) / 65536,
"DisplayedUnitsX": i16(data[4:8]),
"YResolution": i32(data[8:12]) / 65536,
"DisplayedUnitsY": i16(data[12:]),
}
photoshop[code] = data
offset += size
offset += offset & 1 # align
except struct.error:
break # no sufficient data
self.info["photoshop"] = photoshop
elif marker == 0xFFEE and s[:5] == b"Adobe":
self.info["adobe"] = i16(s, 5)