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use std::io;
use std::slice;
use std::str;
use crate::other;
/// An iterator over the pax extensions in an archive entry.
///
/// This iterator yields structures which can themselves be parsed into
/// key/value pairs.
pub struct PaxExtensions<'entry> {
data: slice::Split<'entry, u8, fn(&u8) -> bool>,
}
impl<'entry> PaxExtensions<'entry> {
/// Create new pax extensions iterator from the given entry data.
pub fn new(a: &'entry [u8]) -> Self {
fn is_newline(a: &u8) -> bool {
*a == b'\n'
}
PaxExtensions {
data: a.split(is_newline),
}
}
}
/// A key/value pair corresponding to a pax extension.
pub struct PaxExtension<'entry> {
key: &'entry [u8],
value: &'entry [u8],
}
pub fn pax_extensions_size(a: &[u8]) -> Option<u64> {
for extension in PaxExtensions::new(a) {
let current_extension = match extension {
Ok(ext) => ext,
Err(_) => return None,
};
if current_extension.key() != Ok("size") {
continue;
}
let value = match current_extension.value() {
Ok(value) => value,
Err(_) => return None,
};
let size = match value.parse::<u64>() {
Ok(size) => size,
Err(_) => return None,
};
return Some(size);
}
None
}
impl<'entry> Iterator for PaxExtensions<'entry> {
type Item = io::Result<PaxExtension<'entry>>;
fn next(&mut self) -> Option<io::Result<PaxExtension<'entry>>> {
let line = match self.data.next() {
Some(line) if line.is_empty() => return None,
Some(line) => line,
None => return None,
};
Some(
line.iter()
.position(|b| *b == b' ')
.and_then(|i| {
str::from_utf8(&line[..i])
.ok()
.and_then(|len| len.parse::<usize>().ok().map(|j| (i + 1, j)))
})
.and_then(|(kvstart, reported_len)| {
if line.len() + 1 == reported_len {
line[kvstart..]
.iter()
.position(|b| *b == b'=')
.map(|equals| (kvstart, equals))
} else {
None
}
})
.map(|(kvstart, equals)| PaxExtension {
key: &line[kvstart..kvstart + equals],
value: &line[kvstart + equals + 1..],
})
.ok_or_else(|| other("malformed pax extension")),
)
}
}
impl<'entry> PaxExtension<'entry> {
/// Returns the key for this key/value pair parsed as a string.
///
/// May fail if the key isn't actually utf-8.
pub fn key(&self) -> Result<&'entry str, str::Utf8Error> {
str::from_utf8(self.key)
}
/// Returns the underlying raw bytes for the key of this key/value pair.
pub fn key_bytes(&self) -> &'entry [u8] {
self.key
}
/// Returns the value for this key/value pair parsed as a string.
///
/// May fail if the value isn't actually utf-8.
pub fn value(&self) -> Result<&'entry str, str::Utf8Error> {
str::from_utf8(self.value)
}
/// Returns the underlying raw bytes for this value of this key/value pair.
pub fn value_bytes(&self) -> &'entry [u8] {
self.value
}
}
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