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Merge pull request #39 from cpwood/main
Telepen support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| use crate::Exceptions; | ||
| use crate::common::Result; | ||
|
|
||
| pub fn calculate_checksum(contents: &str) -> char { | ||
| let mut sum = 0; | ||
|
|
||
| for c in contents.chars() { | ||
| sum += c as u32; | ||
| } | ||
|
|
||
| let remainder = sum % 127; | ||
| let diff = 127 - remainder; | ||
| return if diff != 127 { | ||
| diff as u8 as char | ||
| } | ||
| else { | ||
| 0 as char | ||
| }; | ||
| } | ||
|
|
||
| pub fn ascii_to_numeric(contents: &str) -> String { | ||
| let mut number = String::new(); | ||
|
|
||
| for c in contents.chars().map(|x| x as u32) { | ||
| if c >= 27 { | ||
| number.push_str(&format!("{:0>2}", (c - 27))); | ||
| } | ||
| else { | ||
| number.push_str(&format!("{:0>2}", (c - 17))); | ||
| } | ||
| } | ||
|
|
||
| return number; | ||
| } | ||
|
|
||
| pub fn numeric_to_ascii(contents: &str) -> Result<String> { | ||
| if contents.len() % 2 != 0 { | ||
| return Err(Exceptions::illegal_argument_with("Input must contain an even number of characters.")); | ||
| } | ||
|
|
||
| let mut ascii = String::new(); | ||
| let mut i = 0; | ||
|
|
||
| while i < contents.len() { | ||
| let first = contents.chars().nth(i).unwrap() as u8; | ||
| let second = contents.chars().nth(i + 1).unwrap() as u8; | ||
|
|
||
| if second == 88 && first >= 48 && first <= 57 { | ||
| ascii.push((17 + first - 48) as char); | ||
| } | ||
| else if second >= 48 && second <= 57 && first >= 48 && first <= 57 { | ||
| ascii.push((27 + (first - 48) * 10 + (second - 48)) as char); | ||
| } | ||
| else { | ||
| return Err(Exceptions::illegal_argument_with(format!("Input contains an invalid character around position {}.", i.to_string()))); | ||
| } | ||
|
|
||
| i += 2; | ||
| } | ||
|
|
||
| return Ok(ascii); | ||
| } | ||
|
|
||
| #[test] | ||
| fn telepen_checksum_test1() { | ||
| let contents = "Hello world!"; | ||
| let checksum = calculate_checksum(contents); | ||
| assert_eq!('\u{1a}', checksum); | ||
| } | ||
|
|
||
| #[test] | ||
| fn telepen_checksum_test2() { | ||
| let contents = "ABC123456"; | ||
| let checksum = calculate_checksum(contents); | ||
| assert_eq!('\u{1}', checksum); | ||
| } | ||
|
|
||
| #[test] | ||
| fn telepen_alpha_to_numeric_test() { | ||
| let mut ascii = "'=Siu"; | ||
| let mut result = ascii_to_numeric(ascii); | ||
| assert_eq!("1234567890", result); | ||
|
|
||
| ascii = "& oe"; | ||
| result = ascii_to_numeric(ascii); | ||
| assert_eq!("11058474", result); | ||
| } | ||
|
|
||
| #[test] | ||
| fn telepen_numeric_to_ascii_test() { | ||
| let mut numeric = "1234567890"; | ||
| let mut result = numeric_to_ascii(numeric).unwrap(); | ||
| assert_eq!("'=Siu", result); | ||
|
|
||
| numeric = "11058474"; | ||
| result = numeric_to_ascii(numeric).unwrap(); | ||
| assert_eq!("& oe", result); | ||
| } |
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