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Fix UTF-8 parsing from title of song

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This commit is contained in:
Stephen Seo 2021-09-16 15:21:33 +09:00
parent 079477b282
commit 6f5f25503c
1 changed files with 48 additions and 31 deletions
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79
src/main.rs
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@ -76,61 +76,78 @@ fn check_next_chars(
return Err((String::from("idx out of bounds"), 0u8));
}
if buf[idx] & 0b10000000 == 0 {
Ok((
char::from_u32(buf[idx] as u32)
.ok_or_else(|| (String::from("Not one-byte UTF-8"), 0u8))?,
1u8,
))
let result_str = String::from_utf8(vec![buf[idx]]);
if let Ok(mut s) = result_str {
let popped_char = s.pop();
if s.is_empty() {
Ok((popped_char.unwrap(), 1u8))
} else {
Err((String::from("Not one-byte UTF-8 char"), 0u8))
}
} else {
Err((String::from("Not one-byte UTF-8 char"), 0u8))
}
} else if buf[idx] & 0b11100000 == 0b11000000 {
if idx + 1 >= buf.len() {
saved.push(buf[idx]);
return Err((
String::from("Is two byte UTF-8, but not enough bytes provided"),
String::from("Is two-byte UTF-8, but not enough bytes provided"),
1u8,
));
}
Ok((
char::from_u32((buf[idx] as u32) | ((buf[idx + 1] as u32) << 8))
.ok_or_else(|| (String::from("Not two-byte UTF-8"), 0u8))?,
2u8,
))
let result_str = String::from_utf8(vec![buf[idx], buf[idx + 1]]);
if let Ok(mut s) = result_str {
let popped_char = s.pop();
if s.is_empty() {
Ok((popped_char.unwrap(), 2u8))
} else {
Err((String::from("Not two-byte UTF-8 char"), 0u8))
}
} else {
Err((String::from("Not two-byte UTF-8 char"), 0u8))
}
} else if buf[idx] & 0b11110000 == 0b11100000 {
if idx + 2 >= buf.len() {
for c in buf.iter().skip(idx) {
saved.push(*c);
}
return Err((
String::from("Is three byte UTF-8, but not enough bytes provided"),
String::from("Is three-byte UTF-8, but not enough bytes provided"),
(idx + 3 - buf.len()) as u8,
));
}
Ok((
char::from_u32(
(buf[idx] as u32) | ((buf[idx + 1] as u32) << 8) | ((buf[idx + 2] as u32) << 16),
)
.ok_or_else(|| (String::from("Not three-byte UTF-8"), 0u8))?,
3u8,
))
let result_str = String::from_utf8(vec![buf[idx], buf[idx + 1], buf[idx + 2]]);
if let Ok(mut s) = result_str {
let popped_char = s.pop();
if s.is_empty() {
Ok((popped_char.unwrap(), 3u8))
} else {
Err((String::from("Not three-byte UTF-8 char"), 0u8))
}
} else {
Err((String::from("Not three-byte UTF-8 char"), 0u8))
}
} else if buf[idx] & 0b11111000 == 0b11110000 {
if idx + 2 >= buf.len() {
if idx + 3 >= buf.len() {
for c in buf.iter().skip(idx) {
saved.push(*c);
}
return Err((
String::from("Is four byte UTF-8, but not enough bytes provided"),
String::from("Is four-byte UTF-8, but not enough bytes provided"),
(idx + 4 - buf.len()) as u8,
));
}
Ok((
char::from_u32(
(buf[idx] as u32)
| ((buf[idx + 1] as u32) << 8)
| ((buf[idx + 2] as u32) << 16)
| ((buf[idx + 3] as u32) << 24),
)
.ok_or_else(|| (String::from("Not four-byte UTF-8"), 0u8))?,
4u8,
))
let result_str = String::from_utf8(vec![buf[idx], buf[idx + 1], buf[idx + 2]]);
if let Ok(mut s) = result_str {
let popped_char = s.pop();
if s.is_empty() {
Ok((popped_char.unwrap(), 4u8))
} else {
Err((String::from("Not four-byte UTF-8 char"), 0u8))
}
} else {
Err((String::from("Not four-byte UTF-8 char"), 0u8))
}
} else {
Err((String::from("Invalid UTF-8 char"), 0u8))
}