bodgit / sevenzip / 25081651856

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fix: Prevent panics discovered by fuzzing (#402)

A number of `uint64` values read from the file are used for sizing
slices however really large values will induce a panic which can happen
when fuzzing.

For now, check these values are no greater than `math.MaxUint32` which
is safely within the Golang limit for slices and probably large enough.

Some values also should be greater than zero so add an additional check
for that where necessary.

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