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Ensure shred version is never 0

This commit is contained in:
Michael Vines 2020-01-24 09:14:27 -07:00
parent 605623baf5
commit a2f2c46f87
1 changed files with 6 additions and 3 deletions
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9
ledger/src/shred.rs
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@ -403,7 +403,10 @@ impl Shred {
.for_each(|(accum, seed)| *accum ^= *seed)
});
// convert accum into a u16
((accum[0] as u16) << 8) | accum[1] as u16
let version = ((accum[0] as u16) << 8) | accum[1] as u16;
// ensure version is never zero, to avoid looking like an uninitialized version
version.saturating_add(1)
}
}
@ -1468,7 +1471,7 @@ pub mod tests {
0xa5, 0xa5, 0x5a, 0x5a,
];
let version = Shred::version_from_hash(&Hash::new(&hash));
assert_eq!(version, 0);
assert_eq!(version, 1);
let hash = [
0xa5u8, 0xa5, 0x5a, 0x5a, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
@ -1480,7 +1483,7 @@ pub mod tests {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
];
let version = Shred::version_from_hash(&Hash::new(&hash));
assert_eq!(version, 0x5a5a);
assert_eq!(version, 0x5a5b);
}
#[test]