Merging upstream version 1.75.0+dfsg1.

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

1 files changed, 78 insertions, 0 deletions

diff --git a/vendor/kstring/src/lib.rs b/vendor/kstring/src/lib.rs
new file mode 100644
index 000000000..dc1ffd608
--- /dev/null
+++ b/vendor/kstring/src/lib.rs
@@ -0,0 +1,78 @@
+//! Key String: Optimized for map keys.
+//!
+//! # Examples
+//!
+//! String creation
+//! ```rust
+//! // Explicit
+//! let literal = kstring::KString::from_static("literal");
+//! // Implicit
+//! let literal = kstring::KString::from("literal");
+//!
+//! // Explicit
+//! let inline = kstring::KString::try_inline("stack").unwrap();
+//! let inline = kstring::KString::from_ref("stack");
+//!
+//! let formatted: kstring::KStringCow = format!("Hello {} and {}", literal, inline).into();
+//! ```
+//!
+//! # Background
+//!
+//! Considerations:
+//! - Large maps
+//! - Most keys live and drop without being used in any other way
+//! - Most keys are relatively small (single to double digit bytes)
+//! - Keys are immutable
+//! - Allow zero-cost abstractions between structs and maps (e.g. no allocating
+//!   when dealing with struct field names)
+//!
+//! Ramifications:
+//! - Inline small strings rather than going to the heap.
+//! - Preserve `&'static str` across strings ([`KString`]),
+//!   references ([`KStringRef`]), and lifetime abstractions ([`KStringCow`]) to avoid
+//!   allocating for struct field names.
+//! - Use `Box<str>` rather than `String` to use less memory.
+//!
+//! # Feature Flags
+//!
+#![cfg_attr(feature = "document-features", doc = document_features::document_features!())]
+#![cfg_attr(feature = "safe", forbid(unsafe_code))]
+
+#[cfg(not(feature = "std"))]
+compile_error!("`std` feature is required; reserved for future `no_std` support");
+
+mod stack;
+mod string;
+mod string_cow;
+mod string_ref;
+
+pub mod backend;
+
+pub use stack::StackString;
+pub use string::*;
+pub use string_cow::*;
+pub use string_ref::*;
+
+#[cfg(test)]
+mod test {
+    #[test]
+    fn test_size() {
+        println!(
+            "String: {}",
+            std::mem::size_of::<crate::string::StdString>()
+        );
+        println!(
+            "Box<str>: {}",
+            std::mem::size_of::<crate::backend::DefaultStr>()
+        );
+        println!(
+            "Box<Box<str>>: {}",
+            std::mem::size_of::<Box<crate::backend::DefaultStr>>()
+        );
+        println!("str: {}", std::mem::size_of::<&'static str>());
+        println!(
+            "Cow: {}",
+            std::mem::size_of::<std::borrow::Cow<'static, str>>()
+        );
+    }
+}