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Improve cff index reading code

Uli Schlachter requested to merge psychon/cairo:improve-offset-size-checking into master

In a recent MR 1, Adrian Johnson writes:

For additional safety you could change the unsigned long to size_t since long is 32-bits on Win64. The CFF spec says the offset size used in decode_index_offset must be between 1 and 4 so you could range check that to avoid overflowing the offset.

This commit implements exactly that.

Signed-off-by: Uli Schlachter psychon@znc.in

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