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parity-zcash
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Use expect/match instead of unwrap

This commit is contained in:
Wei Tang 2018-04-09 20:27:53 +08:00
parent 6ad1ef5d9e
commit eb548831ab
1 changed files with 34 additions and 33 deletions
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19
script/src/num.rs
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@ -87,12 +87,10 @@ impl From<Num> for usize {
impl Num {
// Reduce the data size to its minimal, and then try to convert it to a num.
pub fn minimally_encode(data: &[u8], max_size: usize) -> Result<Self, Error> {
if data.is_empty() {
return Num::from_slice(data, true, max_size);
}
let last = *data.last().unwrap();
if last != 0x00 && last != 0x80 {
match data.last() {
None => Num::from_slice(data, true, max_size),
Some(last) => {
if *last != 0x00 && *last != 0x80 {
return Num::from_slice(data, true, max_size);
}
@ -114,14 +112,17 @@ impl Num {
return Num::from_slice(&[], true, max_size);
}
if data.last().unwrap() & 0x80 == 0x80 {
data.push(last);
let second_last = *data.last().expect("vec emptiness is checked above; qed");
if second_last & 0x80 == 0x80 {
data.push(*last);
} else {
*data.last_mut().unwrap() |= last;
*data.last_mut().expect("vec emptiness is checked above; qed") |= *last
}
Num::from_slice(&data, true, max_size)
}
}
}
pub fn from_slice(data: &[u8], require_minimal: bool, max_size: usize) -> Result<Self, Error> {
if data.len() > max_size {