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fix panic in log_base2 in malformed demos

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Robin Appelman 2020-01-19 21:15:03 +01:00
commit e412399309
1 changed files with 3 additions and 1 deletions
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src/demo/message/stringtable.rs
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@ -286,5 +286,7 @@ pub fn read_var_int(stream: &mut Stream) -> ReadResult<u32> {
} }
pub fn log_base2<T: PrimInt + Unsigned>(num: T) -> u32 { pub fn log_base2<T: PrimInt + Unsigned>(num: T) -> u32 {
(std::mem::size_of::<T>() as u32 * 8 - 1) - num.leading_zeros() // log(0) = inf, but that's a useless result
// since this would only happen in malformed demos, we just return 0
(std::mem::size_of::<T>() as u32 * 8 - 1).saturating_sub(num.leading_zeros())
} }