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dotCooCoo
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A PDF is refused when a stream in it would decode to more than 256 MB
or has decode parameters the reader can't apply, but the check looked
only at the file's objects. A stream written directly inside an array
or a dictionary, such as the /Function of a shading, was not checked.
On main at b12a52f7, a calculator function holding 257 MiB of deflated
spaces opened after 3.0 to 4.3 s with a peak of 550 to 818 MB when it
was written in an array, in a dictionary or as a shading's function.
The same stream as an object of its own was refused in 81 ms.
hostile in pages.rs now runs unsafe_stream on every stream that the
walk of the file's objects meets, at any depth in arrays and
dictionaries, before it decodes the stream as a calculator function.
It refuses such a file with the same message. The walk is the one the
nesting check made before (64 deep at most).