vendor/os_str_bytes/src/wasm32/mod.rs

   1 use std::borrow::Cow;
   2 use std::error::Error;
   3 use std::ffi::OsStr;
   4 use std::ffi::OsString;
   5 use std::fmt;
   6 use std::fmt::Display;
   7 use std::fmt::Formatter;
   8 use std::result;
   9 use std::str;
  10 use std::str::Utf8Error;
  11
  12 if_raw_str! {
  13     pub(super) mod raw;
  14 }
  15
  16 #[derive(Debug, Eq, PartialEq)]
  17 pub(super) struct EncodingError(Utf8Error);
  18
  19 impl Display for EncodingError {
  20     fn fmt(&self, formatter: &mut Formatter<'_>) -> fmt::Result {
  21         write!(formatter, "os_str_bytes: {}", self.0)
  22     }
  23 }
  24
  25 impl Error for EncodingError {}
  26
  27 type Result<T> = result::Result<T, EncodingError>;
  28
  29 macro_rules! expect_utf8 {
  30     ( $result:expr ) => {
  31         $result.expect(
  32             "platform string contains invalid UTF-8, which should not be \
  33             possible",
  34         )
  35     };
  36 }
  37
  38 pub(super) fn os_str_from_bytes(string: &[u8]) -> Result<Cow<'_, OsStr>> {
  39     str::from_utf8(string)
  40         .map(|x| Cow::Borrowed(OsStr::new(x)))
  41         .map_err(EncodingError)
  42 }
  43
  44 pub(super) fn os_str_to_bytes(os_string: &OsStr) -> Cow<'_, [u8]> {
  45     Cow::Borrowed(expect_utf8!(os_string.to_str()).as_bytes())
  46 }
  47
  48 pub(super) fn os_string_from_vec(string: Vec<u8>) -> Result<OsString> {
  49     String::from_utf8(string)
  50         .map(Into::into)
  51         .map_err(|x| EncodingError(x.utf8_error()))
  52 }
  53
  54 pub(super) fn os_string_into_vec(os_string: OsString) -> Vec<u8> {
  55     expect_utf8!(os_string.into_string()).into_bytes()
  56 }