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use crate::path::Prefix;
use crate::ffi::OsStr;
use crate::mem;
fn os_str_as_u8_slice(s: &OsStr) -> &[u8] {
unsafe { mem::transmute(s) }
}
unsafe fn u8_slice_as_os_str(s: &[u8]) -> &OsStr {
mem::transmute(s)
}
#[inline]
pub fn is_sep_byte(b: u8) -> bool {
b == b'/' || b == b'\\'
}
#[inline]
pub fn is_verbatim_sep(b: u8) -> bool {
b == b'\\'
}
pub fn parse_prefix(path: &OsStr) -> Option<Prefix<'_>> {
use crate::path::Prefix::*;
unsafe {
let mut path = os_str_as_u8_slice(path);
if path.starts_with(br"\\") {
path = &path[2..];
if path.starts_with(br"?\") {
path = &path[2..];
if path.starts_with(br"UNC\") {
path = &path[4..];
let (server, share) = match parse_two_comps(path, is_verbatim_sep) {
Some((server, share)) =>
(u8_slice_as_os_str(server), u8_slice_as_os_str(share)),
None => (u8_slice_as_os_str(path), u8_slice_as_os_str(&[])),
};
return Some(VerbatimUNC(server, share));
} else {
let idx = path.iter().position(|&b| b == b'\\');
if idx == Some(2) && path[1] == b':' {
let c = path[0];
if c.is_ascii() && (c as char).is_alphabetic() {
return Some(VerbatimDisk(c.to_ascii_uppercase()));
}
}
let slice = &path[..idx.unwrap_or(path.len())];
return Some(Verbatim(u8_slice_as_os_str(slice)));
}
} else if path.starts_with(b".\\") {
path = &path[2..];
let pos = path.iter().position(|&b| b == b'\\');
let slice = &path[..pos.unwrap_or(path.len())];
return Some(DeviceNS(u8_slice_as_os_str(slice)));
}
match parse_two_comps(path, is_sep_byte) {
Some((server, share)) if !server.is_empty() && !share.is_empty() => {
return Some(UNC(u8_slice_as_os_str(server), u8_slice_as_os_str(share)));
}
_ => (),
}
} else if path.get(1) == Some(& b':') {
let c = path[0];
if c.is_ascii() && (c as char).is_alphabetic() {
return Some(Disk(c.to_ascii_uppercase()));
}
}
return None;
}
fn parse_two_comps(mut path: &[u8], f: fn(u8) -> bool) -> Option<(&[u8], &[u8])> {
let first = &path[..path.iter().position(|x| f(*x))?];
path = &path[(first.len() + 1)..];
let idx = path.iter().position(|x| f(*x));
let second = &path[..idx.unwrap_or(path.len())];
Some((first, second))
}
}
pub const MAIN_SEP_STR: &str = "\\";
pub const MAIN_SEP: char = '\\';