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44 lines
1.3 KiB
Rust
44 lines
1.3 KiB
Rust
use std::{borrow::Cow, io::Result};
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/// Encoding of Gopher response. Only UTF8 and CP437 are supported.
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#[derive(Debug, PartialEq, Eq, Copy, Clone)]
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pub enum Encoding {
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/// Unicode
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UTF8,
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/// https://en.wikipedia.org/wiki/Code_page_437
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CP437,
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}
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impl Default for Encoding {
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fn default() -> Self {
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Encoding::UTF8
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}
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}
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impl Encoding {
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/// Accepts a string like "UTF8" or "CP437" and returns the
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/// appropriate `Encoding`, or an `Err`.
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pub fn from_str(s: &str) -> Result<Self> {
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match s.to_lowercase().as_ref() {
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"utf8" | "utf-8" | "utf 8" => Ok(Encoding::UTF8),
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"cp437" | "cp-437" | "cp 437" | "pc8" | "pc-8" | "oem us" | "oem-us" => {
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Ok(Encoding::CP437)
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}
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_ => Err(error!("Expected CP437 or UTF8 encoding")),
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}
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}
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/// Convert `response` into a String according to `encoding`.
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pub fn encode<'res>(&self, response: &'res [u8]) -> Cow<'res, str> {
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if matches!(self, Encoding::CP437) {
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let mut converted = String::with_capacity(response.len());
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for b in response {
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converted.push_str(cp437::convert_byte(b));
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}
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Cow::from(converted)
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} else {
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String::from_utf8_lossy(response)
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}
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}
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}
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