Hex codec, for convenience
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@ -0,0 +1,126 @@
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pub enum HexParser {
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Liberal,
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WhitespaceAllowed,
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Strict,
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}
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pub enum HexFormatter {
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Lines(usize),
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Packed,
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}
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pub fn hexdigit(v: u8) -> char {
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(if v < 10 {('0' as u8) + v} else {('a' as u8) + v - 10}) as char
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}
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pub fn unhex(c: char) -> Option<u8> {
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if c >= '0' && c <= '9' {
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return Some((c as u8) - ('0' as u8));
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}
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if c >= 'a' && c <= 'f' {
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return Some((c as u8) - ('a' as u8) + 10);
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}
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if c >= 'A' && c <= 'F' {
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return Some((c as u8) - ('A' as u8) + 10);
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}
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None
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}
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impl HexParser {
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pub fn decode(&self, s: &str) -> Option<Vec<u8>> {
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let mut result = Vec::new();
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let mut buf: u8 = 0;
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let mut buf_full = false;
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for c in s.chars() {
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match unhex(c) {
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None =>
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match self {
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HexParser::Liberal => (),
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HexParser::WhitespaceAllowed => if !c.is_whitespace() { return None },
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HexParser::Strict => return None,
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},
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Some(nibble) =>
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if buf_full {
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result.push(buf << 4 | nibble);
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buf_full = false;
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} else {
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buf = nibble;
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buf_full = true;
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},
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}
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}
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Some(result)
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}
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}
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impl HexFormatter {
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pub fn encode(&self, bs: &[u8]) -> String {
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match self {
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HexFormatter::Lines(max_line_length) => {
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let mut lines = Vec::new();
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let mut line = String::new();
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for b in bs {
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if line.len() + 2 > *max_line_length {
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lines.push(std::mem::take(&mut line));
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}
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line.push(hexdigit(b >> 4));
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line.push(hexdigit(b & 15));
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}
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lines.push(std::mem::take(&mut line));
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lines.join("\n")
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}
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HexFormatter::Packed => {
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let mut result = String::new();
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for b in bs {
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result.push(hexdigit(b >> 4));
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result.push(hexdigit(b & 15));
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}
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result
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}
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}
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test] fn test_decode_packed() {
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let s = "01ab00ff";
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assert_eq!(HexParser::Strict.decode(s), Some(vec![1, 171, 0, 255]));
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assert_eq!(HexParser::WhitespaceAllowed.decode(s), Some(vec![1, 171, 0, 255]));
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assert_eq!(HexParser::Liberal.decode(s), Some(vec![1, 171, 0, 255]));
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}
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#[test] fn test_decode_whitespace() {
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let s = "01ab 00ff";
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assert_eq!(HexParser::Strict.decode(s), None);
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assert_eq!(HexParser::WhitespaceAllowed.decode(s), Some(vec![1, 171, 0, 255]));
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assert_eq!(HexParser::Liberal.decode(s), Some(vec![1, 171, 0, 255]));
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}
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#[test] fn test_decode_liberal() {
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let s = "01ab zz 00ff";
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assert_eq!(HexParser::Strict.decode(s), None);
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assert_eq!(HexParser::WhitespaceAllowed.decode(s), None);
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assert_eq!(HexParser::Liberal.decode(s), Some(vec![1, 171, 0, 255]));
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}
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#[test] fn test_encode_lines() {
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assert_eq!(HexFormatter::Lines(10).encode(&vec![0x5a; 11]), "5a5a5a5a5a\n5a5a5a5a5a\n5a");
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assert_eq!(HexFormatter::Lines(10).encode(&vec![0x5a; 10]), "5a5a5a5a5a\n5a5a5a5a5a");
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assert_eq!(HexFormatter::Lines(10).encode(&vec![0x5a; 9]), "5a5a5a5a5a\n5a5a5a5a");
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assert_eq!(HexFormatter::Lines(9).encode(&vec![0x5a; 11]), "5a5a5a5a\n5a5a5a5a\n5a5a5a");
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assert_eq!(HexFormatter::Lines(9).encode(&vec![0x5a; 10]), "5a5a5a5a\n5a5a5a5a\n5a5a");
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assert_eq!(HexFormatter::Lines(9).encode(&vec![0x5a; 9]), "5a5a5a5a\n5a5a5a5a\n5a");
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assert_eq!(HexFormatter::Lines(8).encode(&vec![0x5a; 11]), "5a5a5a5a\n5a5a5a5a\n5a5a5a");
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assert_eq!(HexFormatter::Lines(8).encode(&vec![0x5a; 10]), "5a5a5a5a\n5a5a5a5a\n5a5a");
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assert_eq!(HexFormatter::Lines(8).encode(&vec![0x5a; 9]), "5a5a5a5a\n5a5a5a5a\n5a");
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}
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#[test] fn test_encode_packed() {
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assert_eq!(HexFormatter::Packed.encode(&vec![0x5a; 11]), "5a5a5a5a5a5a5a5a5a5a5a");
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assert_eq!(HexFormatter::Packed.encode(&vec![0x5a; 10]), "5a5a5a5a5a5a5a5a5a5a");
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assert_eq!(HexFormatter::Packed.encode(&vec![0x5a; 9]), "5a5a5a5a5a5a5a5a5a");
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}
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}
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@ -1,6 +1,7 @@
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pub mod de;
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pub mod ser;
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pub mod error;
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pub mod hex;
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pub mod ser;
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pub mod set;
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pub mod symbol;
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pub mod value;
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