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Diffstat (limited to 'base32/src/lib.rs')
| -rw-r--r-- | base32/src/lib.rs | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/base32/src/lib.rs b/base32/src/lib.rs deleted file mode 100644 index e21cf97..0000000 --- a/base32/src/lib.rs +++ /dev/null @@ -1,221 +0,0 @@ -#[cfg(test)] -extern crate quickcheck; -#[cfg(test)] -extern crate rand; - -use std::cmp::min; - -#[derive(Copy,Clone)] -pub enum Alphabet { - RFC4648 { padding: bool }, - Crockford, -} - -const RFC4648_ALPHABET: &'static [u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"; -const CROCKFORD_ALPHABET: &'static [u8] = b"0123456789ABCDEFGHJKMNPQRSTVWXYZ"; - -pub fn encode(alphabet: Alphabet, data: &[u8]) -> String { - let (alphabet, padding) = match alphabet { - Alphabet::RFC4648 { padding } => (RFC4648_ALPHABET, padding), - Alphabet::Crockford => (CROCKFORD_ALPHABET, false), - }; - let mut ret = Vec::with_capacity((data.len()+3)/4*5); - - for chunk in data.chunks(5) { - let buf = { - let mut buf = [0u8; 5]; - for (i, &b) in chunk.iter().enumerate() { - buf[i] = b; - } - buf - }; - ret.push(alphabet[((buf[0] & 0xF8) >> 3) as usize]); - ret.push(alphabet[(((buf[0] & 0x07) << 2) | ((buf[1] & 0xC0) >> 6)) as usize]); - ret.push(alphabet[((buf[1] & 0x3E) >> 1) as usize]); - ret.push(alphabet[(((buf[1] & 0x01) << 4) | ((buf[2] & 0xF0) >> 4)) as usize]); - ret.push(alphabet[(((buf[2] & 0x0F) << 1) | (buf[3] >> 7)) as usize]); - ret.push(alphabet[((buf[3] & 0x7C) >> 2) as usize]); - ret.push(alphabet[(((buf[3] & 0x03) << 3) | ((buf[4] & 0xE0) >> 5)) as usize]); - ret.push(alphabet[(buf[4] & 0x1F) as usize]); - } - - if data.len() % 5 != 0 { - let len = ret.len(); - let num_extra = 8-(data.len()%5*8+4)/5; - if padding { - for i in 1..num_extra+1 { - ret[len-i] = b'='; - } - } else { - ret.truncate(len-num_extra); - } - } - - String::from_utf8(ret).unwrap() -} - -const RFC4648_INV_ALPHABET: [i8; 43] = [-1, -1, 26, 27, 28, 29, 30, 31, -1, -1, -1, -1, -1, 0, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]; -const CROCKFORD_INV_ALPHABET: [i8; 43] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, -1, 10, 11, 12, 13, 14, 15, 16, 17, 1, 18, 19, 1, 20, 21, 0, 22, 23, 24, 25, 26, -1, 27, 28, 29, 30, 31]; - -pub fn decode(alphabet: Alphabet, data: &str) -> Option<Vec<u8>> { - if !data.is_ascii() { - return None; - } - let data = data.as_bytes(); - let alphabet = match alphabet { - Alphabet::RFC4648 {..} => RFC4648_INV_ALPHABET, - Alphabet::Crockford => CROCKFORD_INV_ALPHABET - }; - let mut unpadded_data_length = data.len(); - for i in 1..min(6, data.len())+1 { - if data[data.len() - i] != b'=' { - break; - } - unpadded_data_length -= 1; - } - let output_length = unpadded_data_length*5/8; - let mut ret = Vec::with_capacity((output_length+4)/5*5); - for chunk in data.chunks(8) { - let buf = { - let mut buf = [0u8; 8]; - for (i, &c) in chunk.iter().enumerate() { - match alphabet.get(c.to_ascii_uppercase().wrapping_sub(b'0') as usize) { - Some(&-1) | None => return None, - Some(&value) => buf[i] = value as u8, - }; - } - buf - }; - ret.push((buf[0] << 3) | (buf[1] >> 2)); - ret.push((buf[1] << 6) | (buf[2] << 1) | (buf[3] >> 4)); - ret.push((buf[3] << 4) | (buf[4] >> 1)); - ret.push((buf[4] << 7) | (buf[5] << 2) | (buf[6] >> 3)); - ret.push((buf[6] << 5) | buf[7]); - } - ret.truncate(output_length); - Some(ret) -} - -#[cfg(test)] -#[allow(dead_code, unused_attributes)] -mod test { - use super::{encode, decode}; - use super::Alphabet::{Crockford, RFC4648}; - use quickcheck; - use std; - use rand::Rng; - - #[derive(Clone)] - struct B32 { - c: u8 - } - - impl quickcheck::Arbitrary for B32 { - fn arbitrary<G: quickcheck::Gen>(g: &mut G) -> B32 { - let alphabet = b"0123456789ABCDEFGHJKMNPQRSTVWXYZ"; - B32 { - c: alphabet[g.gen_range(0, alphabet.len())] - } - } - } - - impl std::fmt::Debug for B32 { - fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> { - (self.c as char).fmt(f) - } - } - - #[test] - fn masks_crockford() { - assert_eq!(encode(Crockford, &[0xF8, 0x3E, 0x0F, 0x83, 0xE0]), "Z0Z0Z0Z0"); - assert_eq!(encode(Crockford, &[0x07, 0xC1, 0xF0, 0x7C, 0x1F]), "0Z0Z0Z0Z"); - assert_eq!(decode(Crockford, "Z0Z0Z0Z0").unwrap(), [0xF8, 0x3E, 0x0F, 0x83, 0xE0]); - assert_eq!(decode(Crockford, "0Z0Z0Z0Z").unwrap(), [0x07, 0xC1, 0xF0, 0x7C, 0x1F]); - } - - #[test] - fn masks_rfc4648() { - assert_eq!(encode(RFC4648 { padding: true }, &[0xF8, 0x3E, 0x7F, 0x83, 0xE7]), "7A7H7A7H"); - assert_eq!(encode(RFC4648 { padding: true }, &[0x77, 0xC1, 0xF7, 0x7C, 0x1F]), "O7A7O7A7"); - assert_eq!(decode(RFC4648 { padding: true }, "7A7H7A7H").unwrap(), [0xF8, 0x3E, 0x7F, 0x83, 0xE7]); - assert_eq!(decode(RFC4648 { padding: true }, "O7A7O7A7").unwrap(), [0x77, 0xC1, 0xF7, 0x7C, 0x1F]); - assert_eq!(encode(RFC4648 { padding: true }, &[0xF8, 0x3E, 0x7F, 0x83]), "7A7H7AY="); - } - - #[test] - fn masks_unpadded_rfc4648() { - assert_eq!(encode(RFC4648 { padding: false }, &[0xF8, 0x3E, 0x7F, 0x83, 0xE7]), "7A7H7A7H"); - assert_eq!(encode(RFC4648 { padding: false }, &[0x77, 0xC1, 0xF7, 0x7C, 0x1F]), "O7A7O7A7"); - assert_eq!(decode(RFC4648 { padding: false }, "7A7H7A7H").unwrap(), [0xF8, 0x3E, 0x7F, 0x83, 0xE7]); - assert_eq!(decode(RFC4648 { padding: false }, "O7A7O7A7").unwrap(), [0x77, 0xC1, 0xF7, 0x7C, 0x1F]); - assert_eq!(encode(RFC4648 { padding: false }, &[0xF8, 0x3E, 0x7F, 0x83]), "7A7H7AY"); - } - - #[test] - fn padding() { - let num_padding = [0, 6, 4, 3, 1]; - for i in 1..6 { - let encoded = encode(RFC4648 { padding: true }, (0..(i as u8)).collect::<Vec<u8>>().as_ref()); - assert_eq!(encoded.len(), 8); - for j in 0..(num_padding[i % 5]) { - assert_eq!(encoded.as_bytes()[encoded.len()-j-1], b'='); - } - for j in 0..(8 - num_padding[i % 5]) { - assert!(encoded.as_bytes()[j] != b'='); - } - } - } - - #[test] - fn invertible_crockford() { - fn test(data: Vec<u8>) -> bool { - decode(Crockford, encode(Crockford, data.as_ref()).as_ref()).unwrap() == data - } - quickcheck::quickcheck(test as fn(Vec<u8>) -> bool) - } - - #[test] - fn invertible_rfc4648() { - fn test(data: Vec<u8>) -> bool { - decode(RFC4648 { padding: true }, encode(RFC4648 { padding: true }, data.as_ref()).as_ref()).unwrap() == data - } - quickcheck::quickcheck(test as fn(Vec<u8>) -> bool) - } - #[test] - fn invertible_unpadded_rfc4648() { - fn test(data: Vec<u8>) -> bool { - decode(RFC4648 { padding: false }, encode(RFC4648 { padding: false }, data.as_ref()).as_ref()).unwrap() == data - } - quickcheck::quickcheck(test as fn(Vec<u8>) -> bool) - } - - #[test] - fn lower_case() { - fn test(data: Vec<B32>) -> bool { - let data: String = data.iter().map(|e| e.c as char).collect(); - decode(Crockford, data.as_ref()) == decode(Crockford, data.to_ascii_lowercase().as_ref()) - } - quickcheck::quickcheck(test as fn(Vec<B32>) -> bool) - } - - #[test] - #[allow(non_snake_case)] - fn iIlL1_oO0() { - assert_eq!(decode(Crockford, "IiLlOo"), decode(Crockford, "111100")); - } - - #[test] - fn invalid_chars_crockford() { - assert_eq!(decode(Crockford, ","), None) - } - - #[test] - fn invalid_chars_rfc4648() { - assert_eq!(decode(RFC4648 { padding: true }, ","), None) - } - - #[test] - fn invalid_chars_unpadded_rfc4648() { - assert_eq!(decode(RFC4648 { padding: false }, ","), None) - } -} |