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quote_word: avoid dependency on phf crate

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This commit is contained in:
Dmitry Bogatov
2019-09-26 16:52:09 +00:00
committed by holger krekel
parent d02a721eed
commit 6c9c21c135
1 changed files with 7 additions and 6 deletions
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13
src/dc_strencode.rs
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@@ -1,5 +1,4 @@
use itertools::Itertools;
use phf::phf_set;
use std::borrow::Cow;
use std::ffi::CString;
use std::ptr;
@@ -36,17 +35,19 @@ pub fn dc_encode_header_words(input: impl AsRef<str>) -> String {
result
}
fn must_encode(byte: u8) -> bool {
static SPECIALS: &[u8] = b",:!\"#$@[\\]^`{|}~=?_";
SPECIALS.into_iter().any(|b| *b == byte)
}
fn quote_word(word: &[u8]) -> String {
static ENCODED: phf::Set<u8> = phf_set! {
b',' , b':' , b'!' , b'"' , b'#' , b'$' , b'@' , b'[' , b'\\' , b']',
b'^' , b'`' , b'{' , b'|', b'}' , b'~' , b'=' , b'?' , b'_' ,
};
let mut result = String::default();
let mut encoded = false;
for byte in word {
let byte = *byte;
if byte >= 128 || ENCODED.contains(&byte) {
if byte >= 128 || must_encode(byte) {
result.push_str(&format!("={:2X}", byte));
encoded = true;
} else if byte == b' ' {