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Additional helper function.

This commit is contained in:
Gav Wood 2016-01-13 01:18:33 +01:00
parent 635bf284b4
commit 6447f9b90b
1 changed files with 5 additions and 2 deletions
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7
src/json_aid.rs
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@ -35,8 +35,7 @@ pub fn h256_from_json(json: &Json) -> H256 {
}
}
pub fn u256_from_json(json: &Json) -> U256 {
let s = json.as_string().unwrap_or("");
pub fn u256_from_hex(s: &str) -> U256 {
if s.len() >= 2 && &s[0..2] == "0x" {
U256::from_str(&s[2..]).unwrap_or(U256::from(0))
} else {
@ -44,6 +43,10 @@ pub fn u256_from_json(json: &Json) -> U256 {
}
}
pub fn u256_from_json(json: &Json) -> U256 {
u256_from_hex(json.as_string().unwrap_or(""))
}
pub fn usize_from_json(json: &Json) -> usize {
u256_from_json(json).low_u64() as usize
}