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Some minor hex changes

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This commit is contained in:
Steven Fackler 2013-08-04 16:09:04 -04:00
parent 2266df51aa
commit 463e2416e9
1 changed files with 8 additions and 6 deletions
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14
src/libextra/hex.rs
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@ -57,7 +57,7 @@ impl<'self> ToHex for &'self str {
* # Example
*
* ~~~ {.rust}
* extern mod extra;
* extern mod extra;
* use extra::ToHex;
*
* fn main () {
@ -74,8 +74,8 @@ impl<'self> ToHex for &'self str {
/// A trait for converting hexadecimal encoded values
pub trait FromHex {
/// Converts the value of `self`, interpreted as base64 encoded data, into
/// an owned vector of bytes, returning the vector.
/// Converts the value of `self`, interpreted as hexadecimal encoded data,
/// into an owned vector of bytes, returning the vector.
fn from_hex(&self) -> Result<~[u8], ~str>;
}
@ -83,6 +83,7 @@ impl<'self> FromHex for &'self [u8] {
/**
* Convert hexadecimal `u8` vector into u8 byte values.
* Every 2 encoded characters is converted into 1 octet.
* Whitespace is ignored.
*
* # Example
*
@ -104,18 +105,19 @@ impl<'self> FromHex for &'self [u8] {
let mut modulus = 0;
let mut buf = 0u8;
for &byte in self.iter() {
for (idx, &byte) in self.iter().enumerate() {
buf <<= 4;
match byte as char {
'A'..'F' => buf |= byte - ('A' as u8) + 10,
'a'..'f' => buf |= byte - ('a' as u8) + 10,
'0'..'9' => buf |= byte - ('0' as u8),
' '|'\r'|'\n' => {
' '|'\r'|'\n'|'\t' => {
buf >>= 4;
loop
}
_ => return Err(~"Invalid hex char")
_ => return Err(fmt!("Invalid byte '%c' found at position %u",
byte as char, idx))
}
modulus += 1;