Introduce 'RawStrBuf', use in 'Origin::map_path()'.

'RawStrBuf' is the owned analog of 'RawStr'. Thus, 'Cow<RawStr>' is
either 'RawStr' or 'RawStrBuf'.

core/http/src/lib.rs

@@ -53,5 +53,5 @@ pub mod private {
 
 pub use crate::method::Method;
 pub use crate::status::{Status, StatusClass};
-pub use crate::raw_str::RawStr;
+pub use crate::raw_str::{RawStr, RawStrBuf};
 pub use crate::header::*;

core/http/src/raw_str.rs

@@ -1,4 +1,4 @@
-use std::borrow::Cow;
+use std::borrow::{Borrow, Cow};
 use std::convert::AsRef;
 use std::cmp::Ordering;
 use std::str::Utf8Error;
@@ -50,6 +50,26 @@ use crate::uncased::UncasedStr;
 #[derive(RefCast, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct RawStr(str);
 
+impl ToOwned for RawStr {
+    type Owned = RawStrBuf;
+
+    fn to_owned(&self) -> Self::Owned {
+        RawStrBuf(self.to_string())
+    }
+}
+
+/// An owned version of [`RawStr`].
+#[repr(transparent)]
+#[derive(RefCast, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct RawStrBuf(String);
+
+impl RawStrBuf {
+    /// Cost-free conversion from `self` into a `String`.
+    pub fn into_string(self) -> String {
+        self.0
+    }
+}
+
 impl RawStr {
     /// Constructs an `&RawStr` from a string-like type at no cost.
     ///
@@ -68,6 +88,46 @@ impl RawStr {
         RawStr::ref_cast(string.as_ref())
     }
 
+    /// Constructs an `&RawStr` from a string-like type at no cost.
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # extern crate rocket;
+    /// use rocket::http::RawStr;
+    ///
+    /// let raw_str = RawStr::new("Hello, world!");
+    ///
+    /// // `into` can also be used; note that the type must be specified
+    /// let raw_str: &RawStr = "Hello, world!".into();
+    /// ```
+    pub fn from_cow_str<'a>(cow: Cow<'a, str>) -> Cow<'a, RawStr> {
+        match cow {
+            Cow::Borrowed(b) => Cow::Borrowed(b.into()),
+            Cow::Owned(b) => Cow::Owned(b.into()),
+        }
+    }
+
+    /// Constructs an `&RawStr` from a string-like type at no cost.
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// # extern crate rocket;
+    /// use rocket::http::RawStr;
+    ///
+    /// let raw_str = RawStr::new("Hello, world!");
+    ///
+    /// // `into` can also be used; note that the type must be specified
+    /// let raw_str: &RawStr = "Hello, world!".into();
+    /// ```
+    pub fn into_cow_str<'a>(cow: Cow<'a, RawStr>) -> Cow<'a, str> {
+        match cow {
+            Cow::Borrowed(b) => Cow::Borrowed(b.as_str()),
+            Cow::Owned(b) => Cow::Owned(b.into_string()),
+        }
+    }
+
     /// Performs percent decoding.
     fn _percent_decode(&self) -> percent_encoding::PercentDecode<'_> {
         percent_encoding::percent_decode(self.as_bytes())
@@ -822,6 +882,64 @@ impl fmt::Display for RawStr {
     }
 }
 
+impl AsRef<RawStr> for RawStrBuf {
+    #[inline(always)]
+    fn as_ref(&self) -> &RawStr {
+        RawStr::new(self.0.as_str())
+    }
+}
+
+impl Borrow<RawStr> for RawStrBuf {
+    #[inline(always)]
+    fn borrow(&self) -> &RawStr {
+        self.as_ref()
+    }
+}
+
+impl std::ops::Deref for RawStrBuf {
+    type Target = RawStr;
+
+    #[inline(always)]
+    fn deref(&self) -> &Self::Target {
+        self.as_ref()
+    }
+}
+
+impl fmt::Display for RawStrBuf {
+    #[inline(always)]
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl fmt::Debug for RawStrBuf {
+    #[inline(always)]
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl From<String> for RawStrBuf {
+    #[inline(always)]
+    fn from(string: String) -> Self {
+        RawStrBuf(string)
+    }
+}
+
+impl From<&str> for RawStrBuf {
+    #[inline(always)]
+    fn from(string: &str) -> Self {
+        string.to_string().into()
+    }
+}
+
+impl From<&RawStr> for RawStrBuf {
+    #[inline(always)]
+    fn from(raw: &RawStr) -> Self {
+        raw.to_string().into()
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::RawStr;

core/http/src/uri/origin.rs

@@ -3,10 +3,10 @@ use std::convert::TryFrom;
 use std::fmt::{self, Display};
 
 use crate::ext::IntoOwned;
-use crate::parse::{Indexed, Extent, IndexedStr};
+use crate::parse::{Indexed, Extent, IndexedStr, uri::tables::is_pchar};
 use crate::uri::{self, UriPart, Query, Path};
 use crate::uri::{Error, Segments, QuerySegments, as_utf8_unchecked};
-use crate::RawStr;
+use crate::{RawStr, RawStrBuf};
 
 use state::Storage;
 
@@ -104,6 +104,19 @@ impl<'a, 'b> PartialEq<Origin<'b>> for Origin<'a> {
     }
 }
 
+impl PartialEq<str> for Origin<'_> {
+    fn eq(&self, other: &str) -> bool {
+        let (path, query) = RawStr::new(other).split_at_byte(b'?');
+        self.path() == path && self.query().unwrap_or("".into()) == query
+    }
+}
+
+impl PartialEq<Origin<'_>> for str {
+    fn eq(&self, other: &Origin<'_>) -> bool {
+        other.eq(self)
+    }
+}
+
 impl IntoOwned for Origin<'_> {
     type Owned = Origin<'static>;
 
@@ -407,20 +420,27 @@ impl<'a> Origin<'a> {
     /// assert_eq!(old_uri.map_path(|p| format!("{}/", p)), Some(expected_uri));
     ///
     /// let old_uri = Origin::parse("/a/b/c/").unwrap();
+    /// let expected = Origin::parse("/b/c/").unwrap();
+    /// assert_eq!(old_uri.map_path(|p| p.strip_prefix("/a").unwrap_or(p)), Some(expected));
+    ///
+    /// let old_uri = Origin::parse("/a").unwrap();
+    /// assert_eq!(old_uri.map_path(|p| p.strip_prefix("/a").unwrap_or(p)), None);
+    ///
+    /// let old_uri = Origin::parse("/a/b/c/").unwrap();
     /// assert_eq!(old_uri.map_path(|p| format!("hi/{}", p)), None);
     /// ```
     #[inline]
-    pub fn map_path<F: FnOnce(&RawStr) -> String>(&self, f: F) -> Option<Self> {
+    pub fn map_path<'s, F, P>(&'s self, f: F) -> Option<Self>
-        let path = f(self.path());
+        where F: FnOnce(&'s RawStr) -> P, P: Into<RawStrBuf> + 's
-        if !path.starts_with('/')
-            || !path.bytes().all(|b| crate::parse::uri::tables::is_pchar(&b))
     {
+        let path = f(self.path()).into();
+        if !path.starts_with('/') || !path.as_bytes().iter().all(|b| is_pchar(&b)) {
             return None;
         }
 
         Some(Origin {
             source: self.source.clone(),
-            path: Cow::from(path).into(),
+            path: Cow::from(path.into_string()).into(),
             query: self.query.clone(),
             decoded_path_segs: Storage::new(),
             decoded_query_segs: Storage::new(),
@@ -617,6 +637,15 @@ impl TryFrom<String> for Origin<'static> {
     }
 }
 
+// Because inference doesn't take `&String` to `&str`.
+impl<'a> TryFrom<&'a String> for Origin<'a> {
+    type Error = Error<'a>;
+
+    fn try_from(value: &'a String) -> Result<Self, Self::Error> {
+        Origin::parse(value.as_str())
+    }
+}
+
 impl<'a> TryFrom<&'a str> for Origin<'a> {
     type Error = Error<'a>;