Various fixes to exif/heic support #19745
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It is illegal to construct out-of-bound pointers, even if they are not dereferenced. The current bound checks rely on undefined behaviour. Fix this by introducing convenience macros that check the remaining length.
The loop checks against `p` but increases `p2`. I don't see the point of having 2 separate variables, so use `p` instead to correct the bounds check and simplify the code in the process.
nielsdos
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…ile size We change the order of operations such that the file size check cannot overflow in the for loop. This prevents infinite loops. We also add an overflow check at the end of the loop body to prevent the addition of offset and box.size from overflowing.
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