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Only read a maximum of 100 bytes at a time

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This commit is contained in:
Andrew Murray 2022-09-28 21:36:07 +10:00
parent d402fe0b17
commit cb2243713c
1 changed files with 18 additions and 6 deletions
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24
src/PIL/ImtImagePlugin.py
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@ -39,15 +39,19 @@ class ImtImageFile(ImageFile.ImageFile):
# Quick rejection: if there's not a LF among the first # Quick rejection: if there's not a LF among the first
# 100 bytes, this is (probably) not a text header. # 100 bytes, this is (probably) not a text header.
if b"\n" not in self.fp.read(100): buffer = self.fp.read(100)
if b"\n" not in buffer:
raise SyntaxError("not an IM file") raise SyntaxError("not an IM file")
self.fp.seek(0)
xsize = ysize = 0 xsize = ysize = 0
while True: while True:
s = self.fp.read(1) if buffer:
s = buffer[:1]
buffer = buffer[1:]
else:
s = self.fp.read(1)
if not s: if not s:
break break
@ -55,7 +59,12 @@ class ImtImageFile(ImageFile.ImageFile):
# image data begins # image data begins
self.tile = [ self.tile = [
("raw", (0, 0) + self.size, self.fp.tell(), (self.mode, 0, 1)) (
"raw",
(0, 0) + self.size,
self.fp.tell() - len(buffer),
(self.mode, 0, 1),
)
] ]
break break
@ -63,8 +72,11 @@ class ImtImageFile(ImageFile.ImageFile):
else: else:
# read key/value pair # read key/value pair
# FIXME: dangerous, may read whole file if b"\n" not in buffer:
s = s + self.fp.readline() buffer += self.fp.read(100)
lines = buffer.split(b"\n")
s += lines.pop(0)
buffer = b"\n".join(lines)
if len(s) == 1 or len(s) > 100: if len(s) == 1 or len(s) > 100:
break break
if s[0] == ord(b"*"): if s[0] == ord(b"*"):