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//! Convert a string in IBM codepage 437 to UTF-8
/// Trait to convert IBM codepage 437 to the target type
pub trait FromCp437 {
/// Target type
type Target;
/// Function that does the conversion from cp437.
/// Generally allocations will be avoided if all data falls into the ASCII range.
#[allow(clippy::wrong_self_convention)]
fn from_cp437(self) -> Self::Target;
}
impl<'a> FromCp437 for &'a [u8] {
type Target = ::std::borrow::Cow<'a, str>;
fn from_cp437(self) -> Self::Target {
if self.iter().all(|c| *c < 0x80) {
::std::str::from_utf8(self).unwrap().into()
} else {
self.iter().map(|c| to_char(*c)).collect::<String>().into()
}
}
}
impl FromCp437 for Box<[u8]> {
type Target = Box<str>;
fn from_cp437(self) -> Self::Target {
if self.iter().all(|c| *c < 0x80) {
String::from_utf8(self.into()).unwrap()
} else {
self.iter().copied().map(to_char).collect()
}
.into_boxed_str()
}
}
fn to_char(input: u8) -> char {
let output = match input {
0x00..=0x7f => input as u32,
0x80 => 0x00c7,
0x81 => 0x00fc,
0x82 => 0x00e9,
0x83 => 0x00e2,
0x84 => 0x00e4,
0x85 => 0x00e0,
0x86 => 0x00e5,
0x87 => 0x00e7,
0x88 => 0x00ea,
0x89 => 0x00eb,
0x8a => 0x00e8,
0x8b => 0x00ef,
0x8c => 0x00ee,
0x8d => 0x00ec,
0x8e => 0x00c4,
0x8f => 0x00c5,
0x90 => 0x00c9,
0x91 => 0x00e6,
0x92 => 0x00c6,
0x93 => 0x00f4,
0x94 => 0x00f6,
0x95 => 0x00f2,
0x96 => 0x00fb,
0x97 => 0x00f9,
0x98 => 0x00ff,
0x99 => 0x00d6,
0x9a => 0x00dc,
0x9b => 0x00a2,
0x9c => 0x00a3,
0x9d => 0x00a5,
0x9e => 0x20a7,
0x9f => 0x0192,
0xa0 => 0x00e1,
0xa1 => 0x00ed,
0xa2 => 0x00f3,
0xa3 => 0x00fa,
0xa4 => 0x00f1,
0xa5 => 0x00d1,
0xa6 => 0x00aa,
0xa7 => 0x00ba,
0xa8 => 0x00bf,
0xa9 => 0x2310,
0xaa => 0x00ac,
0xab => 0x00bd,
0xac => 0x00bc,
0xad => 0x00a1,
0xae => 0x00ab,
0xaf => 0x00bb,
0xb0 => 0x2591,
0xb1 => 0x2592,
0xb2 => 0x2593,
0xb3 => 0x2502,
0xb4 => 0x2524,
0xb5 => 0x2561,
0xb6 => 0x2562,
0xb7 => 0x2556,
0xb8 => 0x2555,
0xb9 => 0x2563,
0xba => 0x2551,
0xbb => 0x2557,
0xbc => 0x255d,
0xbd => 0x255c,
0xbe => 0x255b,
0xbf => 0x2510,
0xc0 => 0x2514,
0xc1 => 0x2534,
0xc2 => 0x252c,
0xc3 => 0x251c,
0xc4 => 0x2500,
0xc5 => 0x253c,
0xc6 => 0x255e,
0xc7 => 0x255f,
0xc8 => 0x255a,
0xc9 => 0x2554,
0xca => 0x2569,
0xcb => 0x2566,
0xcc => 0x2560,
0xcd => 0x2550,
0xce => 0x256c,
0xcf => 0x2567,
0xd0 => 0x2568,
0xd1 => 0x2564,
0xd2 => 0x2565,
0xd3 => 0x2559,
0xd4 => 0x2558,
0xd5 => 0x2552,
0xd6 => 0x2553,
0xd7 => 0x256b,
0xd8 => 0x256a,
0xd9 => 0x2518,
0xda => 0x250c,
0xdb => 0x2588,
0xdc => 0x2584,
0xdd => 0x258c,
0xde => 0x2590,
0xdf => 0x2580,
0xe0 => 0x03b1,
0xe1 => 0x00df,
0xe2 => 0x0393,
0xe3 => 0x03c0,
0xe4 => 0x03a3,
0xe5 => 0x03c3,
0xe6 => 0x00b5,
0xe7 => 0x03c4,
0xe8 => 0x03a6,
0xe9 => 0x0398,
0xea => 0x03a9,
0xeb => 0x03b4,
0xec => 0x221e,
0xed => 0x03c6,
0xee => 0x03b5,
0xef => 0x2229,
0xf0 => 0x2261,
0xf1 => 0x00b1,
0xf2 => 0x2265,
0xf3 => 0x2264,
0xf4 => 0x2320,
0xf5 => 0x2321,
0xf6 => 0x00f7,
0xf7 => 0x2248,
0xf8 => 0x00b0,
0xf9 => 0x2219,
0xfa => 0x00b7,
0xfb => 0x221a,
0xfc => 0x207f,
0xfd => 0x00b2,
0xfe => 0x25a0,
0xff => 0x00a0,
};
::std::char::from_u32(output).unwrap()
}
#[cfg(test)]
mod test {
#[test]
fn to_char_valid() {
for i in 0x00_u32..0x100 {
super::to_char(i as u8);
}
}
#[test]
fn ascii() {
for i in 0x00..0x80 {
assert_eq!(super::to_char(i), i as char);
}
}
#[test]
#[allow(unknown_lints)] // invalid_from_utf8 was added in rust 1.72
#[allow(invalid_from_utf8)]
fn example_slice() {
use super::FromCp437;
let data = b"Cura\x87ao";
assert!(::std::str::from_utf8(data).is_err());
assert_eq!(data.from_cp437(), "Curaçao");
}
#[test]
fn example_vec() {
use super::FromCp437;
let data = vec![0xCC, 0xCD, 0xCD, 0xB9];
assert!(String::from_utf8(data.clone()).is_err());
assert_eq!(&*data.from_cp437(), "╠══╣");
}
}