Adding upstream version 124.0.1.upstream/124.0.1

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

8 files changed, 743 insertions, 0 deletions

diff --git a/third_party/rust/utf8_iter/.cargo-checksum.json b/third_party/rust/utf8_iter/.cargo-checksum.json
new file mode 100644
index 0000000000..c82c22f3e7
--- /dev/null
+++ b/third_party/rust/utf8_iter/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"COPYRIGHT":"c30152c94a6d75e021adbc52b3a52470366a46edb917e17deae3259251af244c","Cargo.toml":"7da67fd58b8f357a045af06383ca245de59e8221a56abc34406fb6ed6e1cc43a","LICENSE-APACHE":"cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30","LICENSE-MIT":"3fa4ca83dcc9237839b1bdeb2e6d16bdfb5ec0c5ce42b24694d8bbf0dcbef72c","README.md":"6acce7a548969e2ef506f385a81ec6d648fdda145e7a035247a4d438e0372b44","src/indices.rs":"b01fbaac3c9a09be130cac57066a980362a1290fac2fe0f27f6238818235f94c","src/lib.rs":"4a5510ee6c8f7c3fbf55d7a26d799b78e766b2ecc170c1d2e55d093b89b45040"},"package":"64a8922555b9500e3d865caed19330172cd67cbf82203f1a3311d8c305cc9f33"}
\ No newline at end of file
diff --git a/third_party/rust/utf8_iter/COPYRIGHT b/third_party/rust/utf8_iter/COPYRIGHT
new file mode 100644
index 0000000000..b5e9457404
--- /dev/null
+++ b/third_party/rust/utf8_iter/COPYRIGHT
@@ -0,0 +1,42 @@
+Copyright Mozilla Foundation
+
+Licensed under the Apache License (Version 2.0), or the MIT license,
+(the "Licenses") at your option. You may not use this file except in
+compliance with one of the Licenses. You may obtain copies of the
+Licenses at:
+
+   https://www.apache.org/licenses/LICENSE-2.0
+   https://opensource.org/licenses/MIT
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the Licenses is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the Licenses for the specific language governing permissions and
+limitations under the Licenses.
+
+--
+
+Test code is dedicated to the Public Domain when so designated (see
+the individual files for PD/CC0-dedicated sections).
+
+--
+
+The implementation for Utf8CharIndices was adapted from the
+CharIndices implementation of the Rust standard library at revision
+ab32548539ec38a939c1b58599249f3b54130026
+(https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/library/core/src/str/iter.rs).
+
+Excerpt from https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/COPYRIGHT ,
+which refers to
+https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/LICENSE-APACHE
+and
+https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/LICENSE-MIT
+:
+
+For full authorship information, see the version control history or
+https://thanks.rust-lang.org
+
+Except as otherwise noted (below and/or in individual files), Rust is
+licensed under the Apache License, Version 2.0 <LICENSE-APACHE> or
+<http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+<LICENSE-MIT> or <http://opensource.org/licenses/MIT>, at your option.
diff --git a/third_party/rust/utf8_iter/Cargo.toml b/third_party/rust/utf8_iter/Cargo.toml
new file mode 100644
index 0000000000..6e89caa036
--- /dev/null
+++ b/third_party/rust/utf8_iter/Cargo.toml
@@ -0,0 +1,34 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2021"
+name = "utf8_iter"
+version = "1.0.3"
+authors = ["Henri Sivonen <hsivonen@hsivonen.fi>"]
+description = "Iterator by char over potentially-invalid UTF-8 in &[u8]"
+homepage = "https://docs.rs/utf8_iter/"
+documentation = "https://docs.rs/utf8_iter/"
+readme = "README.md"
+keywords = [
+    "encoding",
+    "UTF-8",
+    "unicode",
+    "iterator",
+]
+categories = [
+    "text-processing",
+    "encoding",
+    "internationalization",
+]
+license = "Apache-2.0 OR MIT"
+repository = "https://github.com/hsivonen/utf8_iter"
+resolver = "2"
diff --git a/third_party/rust/utf8_iter/LICENSE-APACHE b/third_party/rust/utf8_iter/LICENSE-APACHE
new file mode 100644
index 0000000000..d645695673
--- /dev/null
+++ b/third_party/rust/utf8_iter/LICENSE-APACHE
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/third_party/rust/utf8_iter/LICENSE-MIT b/third_party/rust/utf8_iter/LICENSE-MIT
new file mode 100644
index 0000000000..3317c82e2f
--- /dev/null
+++ b/third_party/rust/utf8_iter/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright Mozilla Foundation
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/third_party/rust/utf8_iter/README.md b/third_party/rust/utf8_iter/README.md
new file mode 100644
index 0000000000..c6290861ae
--- /dev/null
+++ b/third_party/rust/utf8_iter/README.md
@@ -0,0 +1,46 @@
+# utf8_iter
+
+[![crates.io](https://img.shields.io/crates/v/utf8_iter.svg)](https://crates.io/crates/utf8_iter)
+[![docs.rs](https://docs.rs/utf8_iter/badge.svg)](https://docs.rs/utf8_iter/)
+
+utf8_iter provides iteration by `char` over potentially-invalid UTF-8 `&[u8]`
+such that UTF-8 errors are handled according to the WHATWG Encoding Standard.
+
+Key parts of the code are copypaste from the UTF-8 to UTF-16 conversion code
+in `encoding_rs`, which was optimized for speed in the case of valid input.
+The implementation here uses the structure that was found to be fast in the
+`encoding_rs` context but the structure hasn't been benchmarked in this
+context.
+
+This is a `no_std` crate.
+
+## Licensing
+
+TL;DR: `Apache-2.0 OR MIT`
+
+Please see the file named
+[COPYRIGHT](https://github.com/hsivonen/utf8_iter/blob/master/COPYRIGHT).
+
+## Documentation
+
+Generated [API documentation](https://docs.rs/utf8_iter/) is available
+online.
+
+## Release Notes
+
+### 1.0.3
+
+* Fix an error in documentation.
+
+### 1.0.2
+
+* `char_indices()` implementation.
+
+### 1.0.1
+
+* `as_slice()` method.
+* Implement `DoubleEndedIterator`
+
+### 1.0.0
+
+The initial release.
diff --git a/third_party/rust/utf8_iter/src/indices.rs b/third_party/rust/utf8_iter/src/indices.rs
new file mode 100644
index 0000000000..1646f8b8dc
--- /dev/null
+++ b/third_party/rust/utf8_iter/src/indices.rs
@@ -0,0 +1,120 @@
+// The code in this file was adapted from the CharIndices implementation of
+// the Rust standard library at revision ab32548539ec38a939c1b58599249f3b54130026
+// (https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/library/core/src/str/iter.rs).
+//
+// Excerpt from https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/COPYRIGHT ,
+// which refers to
+// https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/LICENSE-APACHE
+// and
+// https://github.com/rust-lang/rust/blob/ab32548539ec38a939c1b58599249f3b54130026/LICENSE-MIT
+// :
+//
+// For full authorship information, see the version control history or
+// https://thanks.rust-lang.org
+//
+// Except as otherwise noted (below and/or in individual files), Rust is
+// licensed under the Apache License, Version 2.0 <LICENSE-APACHE> or
+// <http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT> or <http://opensource.org/licenses/MIT>, at your option.
+
+use super::Utf8Chars;
+use core::iter::FusedIterator;
+
+/// An iterator over the [`char`]s  and their positions.
+#[derive(Clone, Debug)]
+#[must_use = "iterators are lazy and do nothing unless consumed"]
+pub struct Utf8CharIndices<'a> {
+    front_offset: usize,
+    iter: Utf8Chars<'a>,
+}
+
+impl<'a> Iterator for Utf8CharIndices<'a> {
+    type Item = (usize, char);
+
+    #[inline]
+    fn next(&mut self) -> Option<(usize, char)> {
+        let pre_len = self.as_slice().len();
+        match self.iter.next() {
+            None => None,
+            Some(ch) => {
+                let index = self.front_offset;
+                let len = self.as_slice().len();
+                self.front_offset += pre_len - len;
+                Some((index, ch))
+            }
+        }
+    }
+
+    #[inline]
+    fn count(self) -> usize {
+        self.iter.count()
+    }
+
+    #[inline]
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        self.iter.size_hint()
+    }
+
+    #[inline]
+    fn last(mut self) -> Option<(usize, char)> {
+        // No need to go through the entire string.
+        self.next_back()
+    }
+}
+
+impl<'a> DoubleEndedIterator for Utf8CharIndices<'a> {
+    #[inline]
+    fn next_back(&mut self) -> Option<(usize, char)> {
+        self.iter.next_back().map(|ch| {
+            let index = self.front_offset + self.as_slice().len();
+            (index, ch)
+        })
+    }
+}
+
+impl FusedIterator for Utf8CharIndices<'_> {}
+
+impl<'a> Utf8CharIndices<'a> {
+    #[inline(always)]
+    /// Creates the iterator from a byte slice.
+    pub fn new(bytes: &'a [u8]) -> Self {
+        Utf8CharIndices::<'a> {
+            front_offset: 0,
+            iter: Utf8Chars::new(bytes),
+        }
+    }
+
+    /// Views the underlying data as a subslice of the original data.
+    ///
+    /// This has the same lifetime as the original slice, and so the
+    /// iterator can continue to be used while this exists.
+    #[must_use]
+    #[inline]
+    pub fn as_slice(&self) -> &'a [u8] {
+        self.iter.as_slice()
+    }
+
+    /// Returns the byte position of the next character, or the length
+    /// of the underlying string if there are no more characters.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use utf8_iter::Utf8CharsEx;
+    /// let mut chars = "a楽".as_bytes().char_indices();
+    ///
+    /// assert_eq!(chars.offset(), 0);
+    /// assert_eq!(chars.next(), Some((0, 'a')));
+    ///
+    /// assert_eq!(chars.offset(), 1);
+    /// assert_eq!(chars.next(), Some((1, '楽')));
+    ///
+    /// assert_eq!(chars.offset(), 4);
+    /// assert_eq!(chars.next(), None);
+    /// ```
+    #[inline]
+    #[must_use]
+    pub fn offset(&self) -> usize {
+        self.front_offset
+    }
+}
diff --git a/third_party/rust/utf8_iter/src/lib.rs b/third_party/rust/utf8_iter/src/lib.rs
new file mode 100644
index 0000000000..bea1ce029b
--- /dev/null
+++ b/third_party/rust/utf8_iter/src/lib.rs
@@ -0,0 +1,273 @@
+// Copyright Mozilla Foundation
+//
+// Licensed under the Apache License (Version 2.0), or the MIT license,
+// (the "Licenses") at your option. You may not use this file except in
+// compliance with one of the Licenses. You may obtain copies of the
+// Licenses at:
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//    https://opensource.org/licenses/MIT
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the Licenses is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the Licenses for the specific language governing permissions and
+// limitations under the Licenses.
+
+#![no_std]
+
+//! Provides iteration by `char` over `&[u8]` containing potentially-invalid
+//! UTF-8 such that errors are handled according to the [WHATWG Encoding
+//! Standard](https://encoding.spec.whatwg.org/#utf-8-decoder) (i.e. the same
+//! way as in `String::from_utf8_lossy`).
+//!
+//! The trait `Utf8CharsEx` provides the convenience method `chars()` on
+//! byte slices themselves instead of having to use the more verbose
+//! `Utf8Chars::new(slice)`.
+//!
+//! ```rust
+//! use utf8_iter::Utf8CharsEx;
+//! let data = b"\xFF\xC2\xE2\xE2\x98\xF0\xF0\x9F\xF0\x9F\x92\xE2\x98\x83";
+//! let from_iter: String = data.chars().collect();
+//! let from_std = String::from_utf8_lossy(data);
+//! assert_eq!(from_iter, from_std);
+//! ```
+
+mod indices;
+
+pub use crate::indices::Utf8CharIndices;
+use core::iter::FusedIterator;
+
+#[repr(align(64))] // Align to cache lines
+struct Utf8Data {
+    pub table: [u8; 384],
+}
+
+// This is generated code copied and pasted from utf_8.rs of encoding_rs.
+// Please don't edit by hand but instead regenerate as instructed in that
+// file.
+
+static UTF8_DATA: Utf8Data = Utf8Data {
+    table: [
+        252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+        252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+        252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+        252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+        252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+        252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+        252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+        252, 252, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 84, 148, 148, 148,
+        148, 148, 148, 148, 148, 148, 148, 148, 148, 148, 148, 148, 148, 164, 164, 164, 164, 164,
+        164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164,
+        164, 164, 164, 164, 164, 164, 164, 164, 164, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+        252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+        252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+        252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
+        252, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+        4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+        4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+        8, 8, 8, 8, 8, 8, 8, 16, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 32, 8, 8, 64, 8, 8, 8, 128, 4,
+        4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+    ],
+};
+
+// End manually copypasted generated code.
+
+#[inline(always)]
+fn in_inclusive_range8(i: u8, start: u8, end: u8) -> bool {
+    i.wrapping_sub(start) <= (end - start)
+}
+
+/// Iterator by `char` over `&[u8]` that contains
+/// potentially-invalid UTF-8. See the crate documentation.
+#[derive(Debug, Clone)]
+pub struct Utf8Chars<'a> {
+    remaining: &'a [u8],
+}
+
+impl<'a> Utf8Chars<'a> {
+    #[inline(always)]
+    /// Creates the iterator from a byte slice.
+    pub fn new(bytes: &'a [u8]) -> Self {
+        Utf8Chars::<'a> { remaining: bytes }
+    }
+
+    /// Views the current remaining data in the iterator as a subslice
+    /// of the original slice.
+    #[inline(always)]
+    pub fn as_slice(&self) -> &'a [u8] {
+        self.remaining
+    }
+
+    #[inline(never)]
+    fn next_fallback(&mut self) -> Option<char> {
+        if self.remaining.is_empty() {
+            return None;
+        }
+        let first = self.remaining[0];
+        if first < 0x80 {
+            self.remaining = &self.remaining[1..];
+            return Some(char::from(first));
+        }
+        if !in_inclusive_range8(first, 0xC2, 0xF4) || self.remaining.len() == 1 {
+            self.remaining = &self.remaining[1..];
+            return Some('\u{FFFD}');
+        }
+        let second = self.remaining[1];
+        let (lower_bound, upper_bound) = match first {
+            0xE0 => (0xA0, 0xBF),
+            0xED => (0x80, 0x9F),
+            0xF0 => (0x90, 0xBF),
+            0xF4 => (0x80, 0x8F),
+            _ => (0x80, 0xBF),
+        };
+        if !in_inclusive_range8(second, lower_bound, upper_bound) {
+            self.remaining = &self.remaining[1..];
+            return Some('\u{FFFD}');
+        }
+        if first < 0xE0 {
+            self.remaining = &self.remaining[2..];
+            let point = ((u32::from(first) & 0x1F) << 6) | (u32::from(second) & 0x3F);
+            return Some(unsafe { char::from_u32_unchecked(point) });
+        }
+        if self.remaining.len() == 2 {
+            self.remaining = &self.remaining[2..];
+            return Some('\u{FFFD}');
+        }
+        let third = self.remaining[2];
+        if !in_inclusive_range8(third, 0x80, 0xBF) {
+            self.remaining = &self.remaining[2..];
+            return Some('\u{FFFD}');
+        }
+        if first < 0xF0 {
+            self.remaining = &self.remaining[3..];
+            let point = ((u32::from(first) & 0xF) << 12)
+                | ((u32::from(second) & 0x3F) << 6)
+                | (u32::from(third) & 0x3F);
+            return Some(unsafe { char::from_u32_unchecked(point) });
+        }
+        // At this point, we have a valid 3-byte prefix of a
+        // four-byte sequence that has to be incomplete, because
+        // otherwise `next()` would have succeeded.
+        self.remaining = &self.remaining[3..];
+        Some('\u{FFFD}')
+    }
+}
+
+impl<'a> Iterator for Utf8Chars<'a> {
+    type Item = char;
+
+    #[inline]
+    fn next(&mut self) -> Option<char> {
+        // This loop is only broken out of as goto forward
+        #[allow(clippy::never_loop)]
+        loop {
+            if self.remaining.len() < 4 {
+                break;
+            }
+            let first = self.remaining[0];
+            if first < 0x80 {
+                self.remaining = &self.remaining[1..];
+                return Some(char::from(first));
+            }
+            let second = self.remaining[1];
+            if in_inclusive_range8(first, 0xC2, 0xDF) {
+                if !in_inclusive_range8(second, 0x80, 0xBF) {
+                    break;
+                }
+                let point = ((u32::from(first) & 0x1F) << 6) | (u32::from(second) & 0x3F);
+                self.remaining = &self.remaining[2..];
+                return Some(unsafe { char::from_u32_unchecked(point) });
+            }
+            // This table-based formulation was benchmark-based in encoding_rs,
+            // but it hasn't been re-benchmarked in this iterator context.
+            let third = self.remaining[2];
+            if first < 0xF0 {
+                if ((UTF8_DATA.table[usize::from(second)]
+                    & UTF8_DATA.table[usize::from(first) + 0x80])
+                    | (third >> 6))
+                    != 2
+                {
+                    break;
+                }
+                let point = ((u32::from(first) & 0xF) << 12)
+                    | ((u32::from(second) & 0x3F) << 6)
+                    | (u32::from(third) & 0x3F);
+                self.remaining = &self.remaining[3..];
+                return Some(unsafe { char::from_u32_unchecked(point) });
+            }
+            let fourth = self.remaining[3];
+            if (u16::from(
+                UTF8_DATA.table[usize::from(second)] & UTF8_DATA.table[usize::from(first) + 0x80],
+            ) | u16::from(third >> 6)
+                | (u16::from(fourth & 0xC0) << 2))
+                != 0x202
+            {
+                break;
+            }
+            let point = ((u32::from(first) & 0x7) << 18)
+                | ((u32::from(second) & 0x3F) << 12)
+                | ((u32::from(third) & 0x3F) << 6)
+                | (u32::from(fourth) & 0x3F);
+            self.remaining = &self.remaining[4..];
+            return Some(unsafe { char::from_u32_unchecked(point) });
+        }
+        self.next_fallback()
+    }
+}
+
+impl<'a> DoubleEndedIterator for Utf8Chars<'a> {
+    #[inline]
+    fn next_back(&mut self) -> Option<char> {
+        if self.remaining.is_empty() {
+            return None;
+        }
+        let mut attempt = 1;
+        for b in self.remaining.iter().rev() {
+            if b & 0xC0 != 0x80 {
+                let (head, tail) = self.remaining.split_at(self.remaining.len() - attempt);
+                let mut inner = Utf8Chars::new(tail);
+                let candidate = inner.next();
+                if inner.as_slice().is_empty() {
+                    self.remaining = head;
+                    return candidate;
+                }
+                break;
+            }
+            if attempt == 4 {
+                break;
+            }
+            attempt += 1;
+        }
+
+        self.remaining = &self.remaining[..self.remaining.len() - 1];
+        Some('\u{FFFD}')
+    }
+}
+
+impl FusedIterator for Utf8Chars<'_> {}
+
+/// Convenience trait that adds `chars()` and `char_indices()` methods
+/// similar to the ones on string slices to byte slices.
+pub trait Utf8CharsEx {
+    fn chars(&self) -> Utf8Chars<'_>;
+    fn char_indices(&self) -> Utf8CharIndices<'_>;
+}
+
+impl Utf8CharsEx for [u8] {
+    /// Convenience method for creating an UTF-8 iterator
+    /// for the slice.
+    #[inline]
+    fn chars(&self) -> Utf8Chars<'_> {
+        Utf8Chars::new(self)
+    }
+    /// Convenience method for creating a byte index and
+    /// UTF-8 iterator for the slice.
+    #[inline]
+    fn char_indices(&self) -> Utf8CharIndices<'_> {
+        Utf8CharIndices::new(self)
+    }
+}
+
+// No manually-written tests for forward-iteration, because the code passed multiple
+// days of fuzzing comparing with known-good behavior.