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Simplify varint encoding #2645

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merged 2 commits into from
Nov 9, 2023
+3 −12
Merged

Simplify varint encoding #2645

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2172cbb
tighten varint encoding
eagr Nov 8, 2023
a01dfd7
Use binary literals
casey Nov 9, 2023
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15 changes: 3 additions & 12 deletions src/runes/varint.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -11,21 +11,12 @@ pub fn encode_to_vec(mut n: u128, v: &mut Vec<u8>) {
let mut out = [0; 19];
let mut i = 18;

loop {
let mut byte = n.to_le_bytes()[0] & 0b0111_1111;

if i < 18 {
byte |= 0b1000_0000;
}

out[i] = byte;

if n < 0b1000_0000 {
break;
}
out[i] = n.to_le_bytes()[0] & 0b0111_1111;

while n > 0b0111_1111 {
n = n / 128 - 1;
i -= 1;
out[i] = n.to_le_bytes()[0] | 0b1000_0000;
}

v.extend_from_slice(&out[i..]);
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