Merging upstream version 1.71.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 1105 deletions

diff --git a/vendor/bstr-0.2.17/src/ext_vec.rs b/vendor/bstr-0.2.17/src/ext_vec.rs
deleted file mode 100644
index 5beb0e16a..000000000
--- a/vendor/bstr-0.2.17/src/ext_vec.rs
+++ /dev/null
@@ -1,1105 +0,0 @@
-use std::borrow::Cow;
-use std::error;
-use std::ffi::{OsStr, OsString};
-use std::fmt;
-use std::iter;
-use std::ops;
-use std::path::{Path, PathBuf};
-use std::ptr;
-use std::str;
-use std::vec;
-
-use crate::ext_slice::ByteSlice;
-use crate::utf8::{self, Utf8Error};
-
-/// Concatenate the elements given by the iterator together into a single
-/// `Vec<u8>`.
-///
-/// The elements may be any type that can be cheaply converted into an `&[u8]`.
-/// This includes, but is not limited to, `&str`, `&BStr` and `&[u8]` itself.
-///
-/// # Examples
-///
-/// Basic usage:
-///
-/// ```
-/// use bstr;
-///
-/// let s = bstr::concat(&["foo", "bar", "baz"]);
-/// assert_eq!(s, "foobarbaz".as_bytes());
-/// ```
-#[inline]
-pub fn concat<T, I>(elements: I) -> Vec<u8>
-where
-    T: AsRef<[u8]>,
-    I: IntoIterator<Item = T>,
-{
-    let mut dest = vec![];
-    for element in elements {
-        dest.push_str(element);
-    }
-    dest
-}
-
-/// Join the elements given by the iterator with the given separator into a
-/// single `Vec<u8>`.
-///
-/// Both the separator and the elements may be any type that can be cheaply
-/// converted into an `&[u8]`. This includes, but is not limited to,
-/// `&str`, `&BStr` and `&[u8]` itself.
-///
-/// # Examples
-///
-/// Basic usage:
-///
-/// ```
-/// use bstr;
-///
-/// let s = bstr::join(",", &["foo", "bar", "baz"]);
-/// assert_eq!(s, "foo,bar,baz".as_bytes());
-/// ```
-#[inline]
-pub fn join<B, T, I>(separator: B, elements: I) -> Vec<u8>
-where
-    B: AsRef<[u8]>,
-    T: AsRef<[u8]>,
-    I: IntoIterator<Item = T>,
-{
-    let mut it = elements.into_iter();
-    let mut dest = vec![];
-    match it.next() {
-        None => return dest,
-        Some(first) => {
-            dest.push_str(first);
-        }
-    }
-    for element in it {
-        dest.push_str(&separator);
-        dest.push_str(element);
-    }
-    dest
-}
-
-impl ByteVec for Vec<u8> {
-    #[inline]
-    fn as_vec(&self) -> &Vec<u8> {
-        self
-    }
-
-    #[inline]
-    fn as_vec_mut(&mut self) -> &mut Vec<u8> {
-        self
-    }
-
-    #[inline]
-    fn into_vec(self) -> Vec<u8> {
-        self
-    }
-}
-
-/// Ensure that callers cannot implement `ByteSlice` by making an
-/// umplementable trait its super trait.
-pub trait Sealed {}
-impl Sealed for Vec<u8> {}
-
-/// A trait that extends `Vec<u8>` with string oriented methods.
-///
-/// Note that when using the constructor methods, such as
-/// `ByteVec::from_slice`, one should actually call them using the concrete
-/// type. For example:
-///
-/// ```
-/// use bstr::{B, ByteVec};
-///
-/// let s = Vec::from_slice(b"abc"); // NOT ByteVec::from_slice("...")
-/// assert_eq!(s, B("abc"));
-/// ```
-pub trait ByteVec: Sealed {
-    /// A method for accessing the raw vector bytes of this type. This is
-    /// always a no-op and callers shouldn't care about it. This only exists
-    /// for making the extension trait work.
-    #[doc(hidden)]
-    fn as_vec(&self) -> &Vec<u8>;
-
-    /// A method for accessing the raw vector bytes of this type, mutably. This
-    /// is always a no-op and callers shouldn't care about it. This only exists
-    /// for making the extension trait work.
-    #[doc(hidden)]
-    fn as_vec_mut(&mut self) -> &mut Vec<u8>;
-
-    /// A method for consuming ownership of this vector. This is always a no-op
-    /// and callers shouldn't care about it. This only exists for making the
-    /// extension trait work.
-    #[doc(hidden)]
-    fn into_vec(self) -> Vec<u8>
-    where
-        Self: Sized;
-
-    /// Create a new owned byte string from the given byte slice.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::{B, ByteVec};
-    ///
-    /// let s = Vec::from_slice(b"abc");
-    /// assert_eq!(s, B("abc"));
-    /// ```
-    #[inline]
-    fn from_slice<B: AsRef<[u8]>>(bytes: B) -> Vec<u8> {
-        bytes.as_ref().to_vec()
-    }
-
-    /// Create a new byte string from an owned OS string.
-    ///
-    /// On Unix, this always succeeds and is zero cost. On non-Unix systems,
-    /// this returns the original OS string if it is not valid UTF-8.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use std::ffi::OsString;
-    ///
-    /// use bstr::{B, ByteVec};
-    ///
-    /// let os_str = OsString::from("foo");
-    /// let bs = Vec::from_os_string(os_str).expect("valid UTF-8");
-    /// assert_eq!(bs, B("foo"));
-    /// ```
-    #[inline]
-    fn from_os_string(os_str: OsString) -> Result<Vec<u8>, OsString> {
-        #[cfg(unix)]
-        #[inline]
-        fn imp(os_str: OsString) -> Result<Vec<u8>, OsString> {
-            use std::os::unix::ffi::OsStringExt;
-
-            Ok(Vec::from(os_str.into_vec()))
-        }
-
-        #[cfg(not(unix))]
-        #[inline]
-        fn imp(os_str: OsString) -> Result<Vec<u8>, OsString> {
-            os_str.into_string().map(Vec::from)
-        }
-
-        imp(os_str)
-    }
-
-    /// Lossily create a new byte string from an OS string slice.
-    ///
-    /// On Unix, this always succeeds, is zero cost and always returns a slice.
-    /// On non-Unix systems, this does a UTF-8 check. If the given OS string
-    /// slice is not valid UTF-8, then it is lossily decoded into valid UTF-8
-    /// (with invalid bytes replaced by the Unicode replacement codepoint).
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use std::ffi::OsStr;
-    ///
-    /// use bstr::{B, ByteVec};
-    ///
-    /// let os_str = OsStr::new("foo");
-    /// let bs = Vec::from_os_str_lossy(os_str);
-    /// assert_eq!(bs, B("foo"));
-    /// ```
-    #[inline]
-    fn from_os_str_lossy<'a>(os_str: &'a OsStr) -> Cow<'a, [u8]> {
-        #[cfg(unix)]
-        #[inline]
-        fn imp<'a>(os_str: &'a OsStr) -> Cow<'a, [u8]> {
-            use std::os::unix::ffi::OsStrExt;
-
-            Cow::Borrowed(os_str.as_bytes())
-        }
-
-        #[cfg(not(unix))]
-        #[inline]
-        fn imp<'a>(os_str: &'a OsStr) -> Cow<'a, [u8]> {
-            match os_str.to_string_lossy() {
-                Cow::Borrowed(x) => Cow::Borrowed(x.as_bytes()),
-                Cow::Owned(x) => Cow::Owned(Vec::from(x)),
-            }
-        }
-
-        imp(os_str)
-    }
-
-    /// Create a new byte string from an owned file path.
-    ///
-    /// On Unix, this always succeeds and is zero cost. On non-Unix systems,
-    /// this returns the original path if it is not valid UTF-8.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use std::path::PathBuf;
-    ///
-    /// use bstr::{B, ByteVec};
-    ///
-    /// let path = PathBuf::from("foo");
-    /// let bs = Vec::from_path_buf(path).expect("must be valid UTF-8");
-    /// assert_eq!(bs, B("foo"));
-    /// ```
-    #[inline]
-    fn from_path_buf(path: PathBuf) -> Result<Vec<u8>, PathBuf> {
-        Vec::from_os_string(path.into_os_string()).map_err(PathBuf::from)
-    }
-
-    /// Lossily create a new byte string from a file path.
-    ///
-    /// On Unix, this always succeeds, is zero cost and always returns a slice.
-    /// On non-Unix systems, this does a UTF-8 check. If the given path is not
-    /// valid UTF-8, then it is lossily decoded into valid UTF-8 (with invalid
-    /// bytes replaced by the Unicode replacement codepoint).
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use std::path::Path;
-    ///
-    /// use bstr::{B, ByteVec};
-    ///
-    /// let path = Path::new("foo");
-    /// let bs = Vec::from_path_lossy(path);
-    /// assert_eq!(bs, B("foo"));
-    /// ```
-    #[inline]
-    fn from_path_lossy<'a>(path: &'a Path) -> Cow<'a, [u8]> {
-        Vec::from_os_str_lossy(path.as_os_str())
-    }
-
-    /// Appends the given byte to the end of this byte string.
-    ///
-    /// Note that this is equivalent to the generic `Vec::push` method. This
-    /// method is provided to permit callers to explicitly differentiate
-    /// between pushing bytes, codepoints and strings.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let mut s = <Vec<u8>>::from("abc");
-    /// s.push_byte(b'\xE2');
-    /// s.push_byte(b'\x98');
-    /// s.push_byte(b'\x83');
-    /// assert_eq!(s, "abc☃".as_bytes());
-    /// ```
-    #[inline]
-    fn push_byte(&mut self, byte: u8) {
-        self.as_vec_mut().push(byte);
-    }
-
-    /// Appends the given `char` to the end of this byte string.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let mut s = <Vec<u8>>::from("abc");
-    /// s.push_char('1');
-    /// s.push_char('2');
-    /// s.push_char('3');
-    /// assert_eq!(s, "abc123".as_bytes());
-    /// ```
-    #[inline]
-    fn push_char(&mut self, ch: char) {
-        if ch.len_utf8() == 1 {
-            self.push_byte(ch as u8);
-            return;
-        }
-        self.as_vec_mut()
-            .extend_from_slice(ch.encode_utf8(&mut [0; 4]).as_bytes());
-    }
-
-    /// Appends the given slice to the end of this byte string. This accepts
-    /// any type that be converted to a `&[u8]`. This includes, but is not
-    /// limited to, `&str`, `&BStr`, and of course, `&[u8]` itself.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let mut s = <Vec<u8>>::from("abc");
-    /// s.push_str(b"123");
-    /// assert_eq!(s, "abc123".as_bytes());
-    /// ```
-    #[inline]
-    fn push_str<B: AsRef<[u8]>>(&mut self, bytes: B) {
-        self.as_vec_mut().extend_from_slice(bytes.as_ref());
-    }
-
-    /// Converts a `Vec<u8>` into a `String` if and only if this byte string is
-    /// valid UTF-8.
-    ///
-    /// If it is not valid UTF-8, then a
-    /// [`FromUtf8Error`](struct.FromUtf8Error.html)
-    /// is returned. (This error can be used to examine why UTF-8 validation
-    /// failed, or to regain the original byte string.)
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// # fn example() -> Result<(), Box<dyn std::error::Error>> {
-    /// let bytes = Vec::from("hello");
-    /// let string = bytes.into_string()?;
-    ///
-    /// assert_eq!("hello", string);
-    /// # Ok(()) }; example().unwrap()
-    /// ```
-    ///
-    /// If this byte string is not valid UTF-8, then an error will be returned.
-    /// That error can then be used to inspect the location at which invalid
-    /// UTF-8 was found, or to regain the original byte string:
-    ///
-    /// ```
-    /// use bstr::{B, ByteVec};
-    ///
-    /// let bytes = Vec::from_slice(b"foo\xFFbar");
-    /// let err = bytes.into_string().unwrap_err();
-    ///
-    /// assert_eq!(err.utf8_error().valid_up_to(), 3);
-    /// assert_eq!(err.utf8_error().error_len(), Some(1));
-    ///
-    /// // At no point in this example is an allocation performed.
-    /// let bytes = Vec::from(err.into_vec());
-    /// assert_eq!(bytes, B(b"foo\xFFbar"));
-    /// ```
-    #[inline]
-    fn into_string(self) -> Result<String, FromUtf8Error>
-    where
-        Self: Sized,
-    {
-        match utf8::validate(self.as_vec()) {
-            Err(err) => Err(FromUtf8Error { original: self.into_vec(), err }),
-            Ok(()) => {
-                // SAFETY: This is safe because of the guarantees provided by
-                // utf8::validate.
-                unsafe { Ok(self.into_string_unchecked()) }
-            }
-        }
-    }
-
-    /// Lossily converts a `Vec<u8>` into a `String`. If this byte string
-    /// contains invalid UTF-8, then the invalid bytes are replaced with the
-    /// Unicode replacement codepoint.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let bytes = Vec::from_slice(b"foo\xFFbar");
-    /// let string = bytes.into_string_lossy();
-    /// assert_eq!(string, "foo\u{FFFD}bar");
-    /// ```
-    #[inline]
-    fn into_string_lossy(self) -> String
-    where
-        Self: Sized,
-    {
-        match self.as_vec().to_str_lossy() {
-            Cow::Borrowed(_) => {
-                // SAFETY: to_str_lossy() returning a Cow::Borrowed guarantees
-                // the entire string is valid utf8.
-                unsafe { self.into_string_unchecked() }
-            }
-            Cow::Owned(s) => s,
-        }
-    }
-
-    /// Unsafely convert this byte string into a `String`, without checking for
-    /// valid UTF-8.
-    ///
-    /// # Safety
-    ///
-    /// Callers *must* ensure that this byte string is valid UTF-8 before
-    /// calling this method. Converting a byte string into a `String` that is
-    /// not valid UTF-8 is considered undefined behavior.
-    ///
-    /// This routine is useful in performance sensitive contexts where the
-    /// UTF-8 validity of the byte string is already known and it is
-    /// undesirable to pay the cost of an additional UTF-8 validation check
-    /// that [`into_string`](#method.into_string) performs.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// // SAFETY: This is safe because string literals are guaranteed to be
-    /// // valid UTF-8 by the Rust compiler.
-    /// let s = unsafe { Vec::from("☃βツ").into_string_unchecked() };
-    /// assert_eq!("☃βツ", s);
-    /// ```
-    #[inline]
-    unsafe fn into_string_unchecked(self) -> String
-    where
-        Self: Sized,
-    {
-        String::from_utf8_unchecked(self.into_vec())
-    }
-
-    /// Converts this byte string into an OS string, in place.
-    ///
-    /// On Unix, this always succeeds and is zero cost. On non-Unix systems,
-    /// this returns the original byte string if it is not valid UTF-8.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use std::ffi::OsStr;
-    ///
-    /// use bstr::ByteVec;
-    ///
-    /// let bs = Vec::from("foo");
-    /// let os_str = bs.into_os_string().expect("should be valid UTF-8");
-    /// assert_eq!(os_str, OsStr::new("foo"));
-    /// ```
-    #[inline]
-    fn into_os_string(self) -> Result<OsString, Vec<u8>>
-    where
-        Self: Sized,
-    {
-        #[cfg(unix)]
-        #[inline]
-        fn imp(v: Vec<u8>) -> Result<OsString, Vec<u8>> {
-            use std::os::unix::ffi::OsStringExt;
-
-            Ok(OsString::from_vec(v))
-        }
-
-        #[cfg(not(unix))]
-        #[inline]
-        fn imp(v: Vec<u8>) -> Result<OsString, Vec<u8>> {
-            match v.into_string() {
-                Ok(s) => Ok(OsString::from(s)),
-                Err(err) => Err(err.into_vec()),
-            }
-        }
-
-        imp(self.into_vec())
-    }
-
-    /// Lossily converts this byte string into an OS string, in place.
-    ///
-    /// On Unix, this always succeeds and is zero cost. On non-Unix systems,
-    /// this will perform a UTF-8 check and lossily convert this byte string
-    /// into valid UTF-8 using the Unicode replacement codepoint.
-    ///
-    /// Note that this can prevent the correct roundtripping of file paths on
-    /// non-Unix systems such as Windows, where file paths are an arbitrary
-    /// sequence of 16-bit integers.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let bs = Vec::from_slice(b"foo\xFFbar");
-    /// let os_str = bs.into_os_string_lossy();
-    /// assert_eq!(os_str.to_string_lossy(), "foo\u{FFFD}bar");
-    /// ```
-    #[inline]
-    fn into_os_string_lossy(self) -> OsString
-    where
-        Self: Sized,
-    {
-        #[cfg(unix)]
-        #[inline]
-        fn imp(v: Vec<u8>) -> OsString {
-            use std::os::unix::ffi::OsStringExt;
-
-            OsString::from_vec(v)
-        }
-
-        #[cfg(not(unix))]
-        #[inline]
-        fn imp(v: Vec<u8>) -> OsString {
-            OsString::from(v.into_string_lossy())
-        }
-
-        imp(self.into_vec())
-    }
-
-    /// Converts this byte string into an owned file path, in place.
-    ///
-    /// On Unix, this always succeeds and is zero cost. On non-Unix systems,
-    /// this returns the original byte string if it is not valid UTF-8.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let bs = Vec::from("foo");
-    /// let path = bs.into_path_buf().expect("should be valid UTF-8");
-    /// assert_eq!(path.as_os_str(), "foo");
-    /// ```
-    #[inline]
-    fn into_path_buf(self) -> Result<PathBuf, Vec<u8>>
-    where
-        Self: Sized,
-    {
-        self.into_os_string().map(PathBuf::from)
-    }
-
-    /// Lossily converts this byte string into an owned file path, in place.
-    ///
-    /// On Unix, this always succeeds and is zero cost. On non-Unix systems,
-    /// this will perform a UTF-8 check and lossily convert this byte string
-    /// into valid UTF-8 using the Unicode replacement codepoint.
-    ///
-    /// Note that this can prevent the correct roundtripping of file paths on
-    /// non-Unix systems such as Windows, where file paths are an arbitrary
-    /// sequence of 16-bit integers.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let bs = Vec::from_slice(b"foo\xFFbar");
-    /// let path = bs.into_path_buf_lossy();
-    /// assert_eq!(path.to_string_lossy(), "foo\u{FFFD}bar");
-    /// ```
-    #[inline]
-    fn into_path_buf_lossy(self) -> PathBuf
-    where
-        Self: Sized,
-    {
-        PathBuf::from(self.into_os_string_lossy())
-    }
-
-    /// Removes the last byte from this `Vec<u8>` and returns it.
-    ///
-    /// If this byte string is empty, then `None` is returned.
-    ///
-    /// If the last codepoint in this byte string is not ASCII, then removing
-    /// the last byte could make this byte string contain invalid UTF-8.
-    ///
-    /// Note that this is equivalent to the generic `Vec::pop` method. This
-    /// method is provided to permit callers to explicitly differentiate
-    /// between popping bytes and codepoints.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let mut s = Vec::from("foo");
-    /// assert_eq!(s.pop_byte(), Some(b'o'));
-    /// assert_eq!(s.pop_byte(), Some(b'o'));
-    /// assert_eq!(s.pop_byte(), Some(b'f'));
-    /// assert_eq!(s.pop_byte(), None);
-    /// ```
-    #[inline]
-    fn pop_byte(&mut self) -> Option<u8> {
-        self.as_vec_mut().pop()
-    }
-
-    /// Removes the last codepoint from this `Vec<u8>` and returns it.
-    ///
-    /// If this byte string is empty, then `None` is returned. If the last
-    /// bytes of this byte string do not correspond to a valid UTF-8 code unit
-    /// sequence, then the Unicode replacement codepoint is yielded instead in
-    /// accordance with the
-    /// [replacement codepoint substitution policy](index.html#handling-of-invalid-utf8-8).
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let mut s = Vec::from("foo");
-    /// assert_eq!(s.pop_char(), Some('o'));
-    /// assert_eq!(s.pop_char(), Some('o'));
-    /// assert_eq!(s.pop_char(), Some('f'));
-    /// assert_eq!(s.pop_char(), None);
-    /// ```
-    ///
-    /// This shows the replacement codepoint substitution policy. Note that
-    /// the first pop yields a replacement codepoint but actually removes two
-    /// bytes. This is in contrast with subsequent pops when encountering
-    /// `\xFF` since `\xFF` is never a valid prefix for any valid UTF-8
-    /// code unit sequence.
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let mut s = Vec::from_slice(b"f\xFF\xFF\xFFoo\xE2\x98");
-    /// assert_eq!(s.pop_char(), Some('\u{FFFD}'));
-    /// assert_eq!(s.pop_char(), Some('o'));
-    /// assert_eq!(s.pop_char(), Some('o'));
-    /// assert_eq!(s.pop_char(), Some('\u{FFFD}'));
-    /// assert_eq!(s.pop_char(), Some('\u{FFFD}'));
-    /// assert_eq!(s.pop_char(), Some('\u{FFFD}'));
-    /// assert_eq!(s.pop_char(), Some('f'));
-    /// assert_eq!(s.pop_char(), None);
-    /// ```
-    #[inline]
-    fn pop_char(&mut self) -> Option<char> {
-        let (ch, size) = utf8::decode_last_lossy(self.as_vec());
-        if size == 0 {
-            return None;
-        }
-        let new_len = self.as_vec().len() - size;
-        self.as_vec_mut().truncate(new_len);
-        Some(ch)
-    }
-
-    /// Removes a `char` from this `Vec<u8>` at the given byte position and
-    /// returns it.
-    ///
-    /// If the bytes at the given position do not lead to a valid UTF-8 code
-    /// unit sequence, then a
-    /// [replacement codepoint is returned instead](index.html#handling-of-invalid-utf8-8).
-    ///
-    /// # Panics
-    ///
-    /// Panics if `at` is larger than or equal to this byte string's length.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let mut s = Vec::from("foo☃bar");
-    /// assert_eq!(s.remove_char(3), '☃');
-    /// assert_eq!(s, b"foobar");
-    /// ```
-    ///
-    /// This example shows how the Unicode replacement codepoint policy is
-    /// used:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let mut s = Vec::from_slice(b"foo\xFFbar");
-    /// assert_eq!(s.remove_char(3), '\u{FFFD}');
-    /// assert_eq!(s, b"foobar");
-    /// ```
-    #[inline]
-    fn remove_char(&mut self, at: usize) -> char {
-        let (ch, size) = utf8::decode_lossy(&self.as_vec()[at..]);
-        assert!(
-            size > 0,
-            "expected {} to be less than {}",
-            at,
-            self.as_vec().len(),
-        );
-        self.as_vec_mut().drain(at..at + size);
-        ch
-    }
-
-    /// Inserts the given codepoint into this `Vec<u8>` at a particular byte
-    /// position.
-    ///
-    /// This is an `O(n)` operation as it may copy a number of elements in this
-    /// byte string proportional to its length.
-    ///
-    /// # Panics
-    ///
-    /// Panics if `at` is larger than the byte string's length.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let mut s = Vec::from("foobar");
-    /// s.insert_char(3, '☃');
-    /// assert_eq!(s, "foo☃bar".as_bytes());
-    /// ```
-    #[inline]
-    fn insert_char(&mut self, at: usize, ch: char) {
-        self.insert_str(at, ch.encode_utf8(&mut [0; 4]).as_bytes());
-    }
-
-    /// Inserts the given byte string into this byte string at a particular
-    /// byte position.
-    ///
-    /// This is an `O(n)` operation as it may copy a number of elements in this
-    /// byte string proportional to its length.
-    ///
-    /// The given byte string may be any type that can be cheaply converted
-    /// into a `&[u8]`. This includes, but is not limited to, `&str` and
-    /// `&[u8]`.
-    ///
-    /// # Panics
-    ///
-    /// Panics if `at` is larger than the byte string's length.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let mut s = Vec::from("foobar");
-    /// s.insert_str(3, "☃☃☃");
-    /// assert_eq!(s, "foo☃☃☃bar".as_bytes());
-    /// ```
-    #[inline]
-    fn insert_str<B: AsRef<[u8]>>(&mut self, at: usize, bytes: B) {
-        let bytes = bytes.as_ref();
-        let len = self.as_vec().len();
-        assert!(at <= len, "expected {} to be <= {}", at, len);
-
-        // SAFETY: We'd like to efficiently splice in the given bytes into
-        // this byte string. Since we are only working with `u8` elements here,
-        // we only need to consider whether our bounds are correct and whether
-        // our byte string has enough space.
-        self.as_vec_mut().reserve(bytes.len());
-        unsafe {
-            // Shift bytes after `at` over by the length of `bytes` to make
-            // room for it. This requires referencing two regions of memory
-            // that may overlap, so we use ptr::copy.
-            ptr::copy(
-                self.as_vec().as_ptr().add(at),
-                self.as_vec_mut().as_mut_ptr().add(at + bytes.len()),
-                len - at,
-            );
-            // Now copy the bytes given into the room we made above. In this
-            // case, we know that the given bytes cannot possibly overlap
-            // with this byte string since we have a mutable borrow of the
-            // latter. Thus, we can use a nonoverlapping copy.
-            ptr::copy_nonoverlapping(
-                bytes.as_ptr(),
-                self.as_vec_mut().as_mut_ptr().add(at),
-                bytes.len(),
-            );
-            self.as_vec_mut().set_len(len + bytes.len());
-        }
-    }
-
-    /// Removes the specified range in this byte string and replaces it with
-    /// the given bytes. The given bytes do not need to have the same length
-    /// as the range provided.
-    ///
-    /// # Panics
-    ///
-    /// Panics if the given range is invalid.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let mut s = Vec::from("foobar");
-    /// s.replace_range(2..4, "xxxxx");
-    /// assert_eq!(s, "foxxxxxar".as_bytes());
-    /// ```
-    #[inline]
-    fn replace_range<R, B>(&mut self, range: R, replace_with: B)
-    where
-        R: ops::RangeBounds<usize>,
-        B: AsRef<[u8]>,
-    {
-        self.as_vec_mut().splice(range, replace_with.as_ref().iter().cloned());
-    }
-
-    /// Creates a draining iterator that removes the specified range in this
-    /// `Vec<u8>` and yields each of the removed bytes.
-    ///
-    /// Note that the elements specified by the given range are removed
-    /// regardless of whether the returned iterator is fully exhausted.
-    ///
-    /// Also note that is is unspecified how many bytes are removed from the
-    /// `Vec<u8>` if the `DrainBytes` iterator is leaked.
-    ///
-    /// # Panics
-    ///
-    /// Panics if the given range is not valid.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::ByteVec;
-    ///
-    /// let mut s = Vec::from("foobar");
-    /// {
-    ///     let mut drainer = s.drain_bytes(2..4);
-    ///     assert_eq!(drainer.next(), Some(b'o'));
-    ///     assert_eq!(drainer.next(), Some(b'b'));
-    ///     assert_eq!(drainer.next(), None);
-    /// }
-    /// assert_eq!(s, "foar".as_bytes());
-    /// ```
-    #[inline]
-    fn drain_bytes<R>(&mut self, range: R) -> DrainBytes<'_>
-    where
-        R: ops::RangeBounds<usize>,
-    {
-        DrainBytes { it: self.as_vec_mut().drain(range) }
-    }
-}
-
-/// A draining byte oriented iterator for `Vec<u8>`.
-///
-/// This iterator is created by
-/// [`ByteVec::drain_bytes`](trait.ByteVec.html#method.drain_bytes).
-///
-/// # Examples
-///
-/// Basic usage:
-///
-/// ```
-/// use bstr::ByteVec;
-///
-/// let mut s = Vec::from("foobar");
-/// {
-///     let mut drainer = s.drain_bytes(2..4);
-///     assert_eq!(drainer.next(), Some(b'o'));
-///     assert_eq!(drainer.next(), Some(b'b'));
-///     assert_eq!(drainer.next(), None);
-/// }
-/// assert_eq!(s, "foar".as_bytes());
-/// ```
-#[derive(Debug)]
-pub struct DrainBytes<'a> {
-    it: vec::Drain<'a, u8>,
-}
-
-impl<'a> iter::FusedIterator for DrainBytes<'a> {}
-
-impl<'a> Iterator for DrainBytes<'a> {
-    type Item = u8;
-
-    #[inline]
-    fn next(&mut self) -> Option<u8> {
-        self.it.next()
-    }
-}
-
-impl<'a> DoubleEndedIterator for DrainBytes<'a> {
-    #[inline]
-    fn next_back(&mut self) -> Option<u8> {
-        self.it.next_back()
-    }
-}
-
-impl<'a> ExactSizeIterator for DrainBytes<'a> {
-    #[inline]
-    fn len(&self) -> usize {
-        self.it.len()
-    }
-}
-
-/// An error that may occur when converting a `Vec<u8>` to a `String`.
-///
-/// This error includes the original `Vec<u8>` that failed to convert to a
-/// `String`. This permits callers to recover the allocation used even if it
-/// it not valid UTF-8.
-///
-/// # Examples
-///
-/// Basic usage:
-///
-/// ```
-/// use bstr::{B, ByteVec};
-///
-/// let bytes = Vec::from_slice(b"foo\xFFbar");
-/// let err = bytes.into_string().unwrap_err();
-///
-/// assert_eq!(err.utf8_error().valid_up_to(), 3);
-/// assert_eq!(err.utf8_error().error_len(), Some(1));
-///
-/// // At no point in this example is an allocation performed.
-/// let bytes = Vec::from(err.into_vec());
-/// assert_eq!(bytes, B(b"foo\xFFbar"));
-/// ```
-#[derive(Debug, Eq, PartialEq)]
-pub struct FromUtf8Error {
-    original: Vec<u8>,
-    err: Utf8Error,
-}
-
-impl FromUtf8Error {
-    /// Return the original bytes as a slice that failed to convert to a
-    /// `String`.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::{B, ByteVec};
-    ///
-    /// let bytes = Vec::from_slice(b"foo\xFFbar");
-    /// let err = bytes.into_string().unwrap_err();
-    ///
-    /// // At no point in this example is an allocation performed.
-    /// assert_eq!(err.as_bytes(), B(b"foo\xFFbar"));
-    /// ```
-    #[inline]
-    pub fn as_bytes(&self) -> &[u8] {
-        &self.original
-    }
-
-    /// Consume this error and return the original byte string that failed to
-    /// convert to a `String`.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::{B, ByteVec};
-    ///
-    /// let bytes = Vec::from_slice(b"foo\xFFbar");
-    /// let err = bytes.into_string().unwrap_err();
-    /// let original = err.into_vec();
-    ///
-    /// // At no point in this example is an allocation performed.
-    /// assert_eq!(original, B(b"foo\xFFbar"));
-    /// ```
-    #[inline]
-    pub fn into_vec(self) -> Vec<u8> {
-        self.original
-    }
-
-    /// Return the underlying UTF-8 error that occurred. This error provides
-    /// information on the nature and location of the invalid UTF-8 detected.
-    ///
-    /// # Examples
-    ///
-    /// Basic usage:
-    ///
-    /// ```
-    /// use bstr::{B, ByteVec};
-    ///
-    /// let bytes = Vec::from_slice(b"foo\xFFbar");
-    /// let err = bytes.into_string().unwrap_err();
-    ///
-    /// assert_eq!(err.utf8_error().valid_up_to(), 3);
-    /// assert_eq!(err.utf8_error().error_len(), Some(1));
-    /// ```
-    #[inline]
-    pub fn utf8_error(&self) -> &Utf8Error {
-        &self.err
-    }
-}
-
-impl error::Error for FromUtf8Error {
-    #[inline]
-    fn description(&self) -> &str {
-        "invalid UTF-8 vector"
-    }
-}
-
-impl fmt::Display for FromUtf8Error {
-    #[inline]
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", self.err)
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::ext_vec::ByteVec;
-
-    #[test]
-    fn insert() {
-        let mut s = vec![];
-        s.insert_str(0, "foo");
-        assert_eq!(s, "foo".as_bytes());
-
-        let mut s = Vec::from("a");
-        s.insert_str(0, "foo");
-        assert_eq!(s, "fooa".as_bytes());
-
-        let mut s = Vec::from("a");
-        s.insert_str(1, "foo");
-        assert_eq!(s, "afoo".as_bytes());
-
-        let mut s = Vec::from("foobar");
-        s.insert_str(3, "quux");
-        assert_eq!(s, "fooquuxbar".as_bytes());
-
-        let mut s = Vec::from("foobar");
-        s.insert_str(3, "x");
-        assert_eq!(s, "fooxbar".as_bytes());
-
-        let mut s = Vec::from("foobar");
-        s.insert_str(0, "x");
-        assert_eq!(s, "xfoobar".as_bytes());
-
-        let mut s = Vec::from("foobar");
-        s.insert_str(6, "x");
-        assert_eq!(s, "foobarx".as_bytes());
-
-        let mut s = Vec::from("foobar");
-        s.insert_str(3, "quuxbazquux");
-        assert_eq!(s, "fooquuxbazquuxbar".as_bytes());
-    }
-
-    #[test]
-    #[should_panic]
-    fn insert_fail1() {
-        let mut s = vec![];
-        s.insert_str(1, "foo");
-    }
-
-    #[test]
-    #[should_panic]
-    fn insert_fail2() {
-        let mut s = Vec::from("a");
-        s.insert_str(2, "foo");
-    }
-
-    #[test]
-    #[should_panic]
-    fn insert_fail3() {
-        let mut s = Vec::from("foobar");
-        s.insert_str(7, "foo");
-    }
-}