The struct member "dest" should never be less than "destStart", so their
difference is never negative. Cast as such to make the comparison
explicitly unsigned, ensuring the compiler produces the correct comparison
instruction, and avoiding any compiler warnings.
The order of function calls in an arithmetic expression is undefined and so
they must be written out as sequential statements.
Thanks to @dv-extrarius for reporting this issue, see issue #3690.
Adds check that LZ offsets fall into the sliding dictionary used. This
catches a case when uzlib.DecompIO with a smaller dictionary is used
to decompress data which was compressed with a larger dictionary.
Previously, this would lead to producing invalid data or crash, now
an exception will be thrown.
Damien George
Paul Sokolovsky