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Fix bug in bitfield.

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Paul Hauner 2019-04-02 15:34:18 +11:00
parent f61db9cac8
commit 1d34e2b2a5
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1 changed files with 12 additions and 3 deletions
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15
eth2/utils/boolean-bitfield/src/lib.rs
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@ -33,12 +33,21 @@ impl BooleanBitfield {
} }
/// Create a new bitfield with the given length `initial_len` and all values set to `bit`. /// Create a new bitfield with the given length `initial_len` and all values set to `bit`.
///
/// Note: if `initial_len` is not a multiple of 8, the remaining bits will be set to `false`
/// regardless of `bit`.
pub fn from_elem(initial_len: usize, bit: bool) -> Self { pub fn from_elem(initial_len: usize, bit: bool) -> Self {
// BitVec can panic if we don't set the len to be a multiple of 8. // BitVec can panic if we don't set the len to be a multiple of 8.
let len = ((initial_len + 7) / 8) * 8; let full_len = ((initial_len + 7) / 8) * 8;
Self { let mut bitfield = BitVec::from_elem(full_len, false);
0: BitVec::from_elem(len, bit),
if bit {
for i in 0..initial_len {
bitfield.set(i, true);
}
} }
Self { 0: bitfield }
} }
/// Create a new bitfield using the supplied `bytes` as input /// Create a new bitfield using the supplied `bytes` as input