Adding upstream version 115.7.0esr.upstream/115.7.0esr

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

9 files changed, 670 insertions, 0 deletions

diff --git a/third_party/rust/chardetng_c/.cargo-checksum.json b/third_party/rust/chardetng_c/.cargo-checksum.json
new file mode 100644
index 0000000000..404017a483
--- /dev/null
+++ b/third_party/rust/chardetng_c/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"CONTRIBUTING.md":"5f28b63428b92d27d796d6d926447d15a19232236200e161ec870f4fdda1b489","COPYRIGHT":"5fa6d8c0701e5ce051b72b9ed08e3a75d5aee8e4132d876556c3dc04084238c7","Cargo.toml":"4bdc7754f31d433d876bb1055ad3bb1b8061fe7044daa316b7cc43c323cf22bc","LICENSE-APACHE":"cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30","LICENSE-MIT":"3fa4ca83dcc9237839b1bdeb2e6d16bdfb5ec0c5ce42b24694d8bbf0dcbef72c","README.md":"f458dc617c487ace6c60096e1bf3ab1b39c151543b40916717596c28e81deebc","include/chardetng.h":"8a781fcbf6441d063abc6c004d485cb2d5a0b304f3bfe5d5978e70437b7b778e","src/lib.rs":"2eeaf976144bab2c9c819934ca0fce36fe2d9b21236d19b506426733d9a57e2b"},"package":null}
\ No newline at end of file
diff --git a/third_party/rust/chardetng_c/CONTRIBUTING.md b/third_party/rust/chardetng_c/CONTRIBUTING.md
new file mode 100644
index 0000000000..ca03c5d355
--- /dev/null
+++ b/third_party/rust/chardetng_c/CONTRIBUTING.md
@@ -0,0 +1,34 @@
+If you send a pull request / patch, please observe the following.
+
+## Licensing
+
+Since this crate is dual-licensed,
+[section 5 of the Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0#contributions)
+is considered to apply in the sense of Contributions being automatically
+under the Apache License 2.0 or MIT dual license (see the `COPYRIGHT` file).
+That is, by the act of offering a Contribution, you place your Contribution
+under the Apache License 2.0 or MIT dual license stated in the `COPYRIGHT`
+file. Please do not contribute if you aren't willing or allowed to license your
+contributions in this manner.
+
+You are encouraged to dedicate test code that you contribute to the Public
+Domain using the CC0 dedication. If you contribute test code that is not
+dedicated to the Public Domain, please be sure not to put it in a part of
+source code that the comments designate as being dedicated to the Public
+Domain.
+
+## Copyright Notices
+
+If you require the addition of your copyright notice, it's up to you to edit in
+your notice as part of your Contribution. Not adding a copyright notice is
+taken as a waiver of copyright notice.
+
+## Compatibility with Stable Rust
+
+Please ensure that your Contribution compiles with the latest stable-channel
+rustc.
+
+## rustfmt
+
+The `rustfmt` version used for this code is `rustfmt-nightly`. Please either
+use that version or avoid using `rustfmt` (so as not to reformat all the code).
diff --git a/third_party/rust/chardetng_c/COPYRIGHT b/third_party/rust/chardetng_c/COPYRIGHT
new file mode 100644
index 0000000000..e149878112
--- /dev/null
+++ b/third_party/rust/chardetng_c/COPYRIGHT
@@ -0,0 +1,9 @@
+chardetng_c is copyright Mozilla Foundation.
+
+Licensed under the Apache License, Version 2.0
+<LICENSE-APACHE or
+https://www.apache.org/licenses/LICENSE-2.0> or the MIT
+license <LICENSE-MIT or https://opensource.org/licenses/MIT>,
+at your option. All files in the project carrying such
+notice may not be copied, modified, or distributed except
+according to those terms.
diff --git a/third_party/rust/chardetng_c/Cargo.toml b/third_party/rust/chardetng_c/Cargo.toml
new file mode 100644
index 0000000000..a4dbace3b2
--- /dev/null
+++ b/third_party/rust/chardetng_c/Cargo.toml
@@ -0,0 +1,38 @@
+# 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 = "2018"
+name = "chardetng_c"
+version = "0.1.2"
+authors = ["Henri Sivonen <hsivonen@hsivonen.fi>"]
+description = "C bindings for chardetng"
+homepage = "https://docs.rs/chardetng_c/"
+documentation = "https://docs.rs/chardetng_c/"
+readme = "README.md"
+keywords = [
+    "encoding",
+    "web",
+    "unicode",
+    "charset",
+]
+categories = [
+    "text-processing",
+    "encoding",
+    "web-programming",
+    "internationalization",
+]
+license = "Apache-2.0 OR MIT"
+repository = "https://github.com/hsivonen/chardetng-c"
+
+[dependencies]
+chardetng = "0.1.1"
+encoding_rs = "0.8.17"
diff --git a/third_party/rust/chardetng_c/LICENSE-APACHE b/third_party/rust/chardetng_c/LICENSE-APACHE
new file mode 100644
index 0000000000..d645695673
--- /dev/null
+++ b/third_party/rust/chardetng_c/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/chardetng_c/LICENSE-MIT b/third_party/rust/chardetng_c/LICENSE-MIT
new file mode 100644
index 0000000000..3317c82e2f
--- /dev/null
+++ b/third_party/rust/chardetng_c/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/chardetng_c/README.md b/third_party/rust/chardetng_c/README.md
new file mode 100644
index 0000000000..bba148ceb3
--- /dev/null
+++ b/third_party/rust/chardetng_c/README.md
@@ -0,0 +1,31 @@
+# chardetng_c
+
+[![crates.io](https://meritbadge.herokuapp.com/chardetng_c)](https://crates.io/crates/chardetng_c)
+[![docs.rs](https://docs.rs/chardetng_c/badge.svg)](https://docs.rs/chardetng_c/)
+[![Apache 2 / MIT dual-licensed](https://img.shields.io/badge/license-Apache%202%20%2F%20MIT-blue.svg)](https://github.com/hsivonen/chardetng_c/blob/master/COPYRIGHT)
+
+A C wrapper for [`chardetng`](https://crates.io/crates/chardetng).
+
+## Licensing
+
+Please see the file named
+[COPYRIGHT](https://github.com/hsivonen/chardetng_c/blob/master/COPYRIGHT).
+
+## Documentation
+
+Generated [API documentation](https://docs.rs/chardetng_c/) is available
+online.
+
+## Release Notes
+
+### 0.1.2
+
+* Remove year from copyright notices.
+
+### 0.1.1
+
+* Add newline to the end of the C header.
+
+### 0.1.0
+
+* Initial release.
diff --git a/third_party/rust/chardetng_c/include/chardetng.h b/third_party/rust/chardetng_c/include/chardetng.h
new file mode 100644
index 0000000000..b59d05702e
--- /dev/null
+++ b/third_party/rust/chardetng_c/include/chardetng.h
@@ -0,0 +1,154 @@
+// Copyright Mozilla Foundation. See the COPYRIGHT
+// file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#ifndef chardetng_h
+#define chardetng_h
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "encoding_rs.h"
+
+#ifndef CHARDETNG_ENCODING_DETECTOR
+#define CHARDETNG_ENCODING_DETECTOR EncodingDetector
+#ifndef __cplusplus
+typedef struct Detector_ EncodingDetector;
+#endif
+#endif
+
+/// Instantiates a Web browser-oriented detector for guessing what
+/// character encoding a stream of bytes is encoded in.
+///
+/// The bytes are fed to the detector incrementally using the
+/// `chardetng_encoding_detector_free` function. The current guess of the
+/// detector can be queried using the `chardetng_encoding_detector_guess`
+/// function. The guessing parameters are arguments to the
+/// `chardetng_encoding_detector_guess` function rather than arguments to the
+/// constructor in order to enable the application to check if the arguments
+/// affect the guessing outcome. (The specific use case is to disable UI for
+/// re-running the detector with UTF-8 allowed and the top-level domain name
+/// ignored if those arguments don't change the guess.)
+///
+/// The instantiated detector must be freed after use using
+/// `chardetng_detectordetector_free`.
+CHARDETNG_ENCODING_DETECTOR* chardetng_encoding_detector_new();
+
+/// Deallocates a detector obtained from `chardetng_encodingdetector_new`.
+void chardetng_encoding_detector_free(CHARDETNG_ENCODING_DETECTOR* detector);
+
+/// Queries whether the TLD is considered non-generic and could affect the guess.
+///
+/// # Undefined Behavior
+///
+/// UB ensues if
+///
+/// * `tld` is non-NULL and `tld_len` is non-zero but `tld` and `tld_len`
+///   don't designate a range of memory valid for reading.
+bool chardetng_encoding_detector_tld_may_affect_guess(char const* tld, size_t tld_len);
+
+/// Inform the detector of a chunk of input.
+///
+/// The byte stream is represented as a sequence of calls to this
+/// function such that the concatenation of the arguments to this
+/// function form the byte stream. It does not matter how the application
+/// chooses to chunk the stream. It is OK to call this function with
+/// a zero-length byte slice.
+///
+/// The end of the stream is indicated by calling this function with
+/// `last` set to `true`. In that case, the end of the stream is
+/// considered to occur after the last byte of the `buffer` (which
+/// may be zero-length) passed in the same call. Once this function
+/// has been called with `last` set to `true` this function must not
+/// be called again.
+///
+/// If you want to perform detection on just the prefix of a longer
+/// stream, do not pass `last=true` after the prefix if the stream
+/// actually still continues.
+///
+/// Returns `true` if after processing `buffer` the stream has
+/// contained at least one non-ASCII byte and `false` if only
+/// ASCII has been seen so far.
+///
+/// # Panics
+///
+/// If this function has previously been called with `last` set to `true`.
+///
+/// # Undefined Behavior
+///
+/// UB ensues if
+///
+/// * `detector` does not point to a detector obtained from
+///   `chardetng_detector_new` but not yet freed with
+///   `chardetng_detector_free`.
+/// * `buffer` is `NULL`. (It can be a bogus pointer when `buffer_len` is 0.)
+/// * ,buffer_len` is non-zero and `buffer` and `buffer_len` don't designate
+///    a range of memory valid for reading.
+bool chardetng_encoding_detector_feed(
+    CHARDETNG_ENCODING_DETECTOR* detector,
+    uint8_t const* buffer,
+    size_t buffer_len,
+    bool last
+);
+
+/// Guess the encoding given the bytes pushed to the detector so far
+/// (via `chardetng_encoding_detector_feed()`), the top-level domain name 
+/// from which the bytes were loaded, and an indication of whether to
+/// consider UTF-8 as a permissible guess.
+///
+/// The `tld` argument takes the rightmost DNS label of the hostname of the
+/// host the stream was loaded from in lower-case ASCII form. That is, if
+/// the label is an internationalized top-level domain name, it must be
+/// provided in its Punycode form. If the TLD that the stream was loaded
+/// from is unavalable, `NULL` may be passed instead (and 0 as `tld_len`),
+/// which is equivalent to passing pointer to "com" as `tld` and 3 as 
+/// `tld_len`.
+///
+/// If the `allow_utf8` argument is set to `false`, the return value of
+/// this function won't be `UTF_8_ENCODING`. When performing detection
+/// on `text/html` on non-`file:` URLs, Web browsers must pass `false`,
+/// unless the user has taken a specific contextual action to request an
+/// override. This way, Web developers cannot start depending on UTF-8
+/// detection. Such reliance would make the Web Platform more brittle.
+///
+/// Returns the guessed encoding (never `NULL`).
+///
+/// # Panics
+///
+/// If `tld` is `NULL` but `tld_len` is not zero.
+///
+/// If `tld` contains non-ASCII, period, or upper-case letters. (The panic
+/// condition is intentionally limited to signs of failing to extract the
+/// label correctly, failing to provide it in its Punycode form, and failure
+/// to lower-case it. Full DNS label validation is intentionally not performed
+/// to avoid panics when the reality doesn't match the specs.)
+///
+/// # Undefined Behavior
+///
+/// UB ensues if
+///
+/// * `detector` does not point to a detector obtained from
+///   `chardetng_detector_new` but not yet freed with
+///   `chardetng_detector_free`.
+/// * `tld` is non-NULL and `tld_len` is non-zero but `tld` and `tld_len`
+///   don't designate a range of memory valid for reading.
+ENCODING_RS_ENCODING const* chardetng_encoding_detector_guess(
+    CHARDETNG_ENCODING_DETECTOR const* detector,
+    char const* tld,
+    size_t tld_len,
+    bool allow_utf8
+);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // chardetng_h
diff --git a/third_party/rust/chardetng_c/src/lib.rs b/third_party/rust/chardetng_c/src/lib.rs
new file mode 100644
index 0000000000..0ca3383b9e
--- /dev/null
+++ b/third_party/rust/chardetng_c/src/lib.rs
@@ -0,0 +1,176 @@
+// Copyright Mozilla Foundation. See the COPYRIGHT
+// file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![doc(html_root_url = "https://docs.rs/chardetng_c/0.1.0")]
+
+//! C API for [`chardetng`](https://docs.rs/chardetng/)
+//!
+//! # Panics
+//!
+//! This crate is designed to be used only in a `panic=abort` scenario.
+//! Panic propagation across FFI is not handled!
+//!
+//! # Licensing
+//!
+//! See the file named [COPYRIGHT](https://github.com/hsivonen/chardetng_c/blob/master/COPYRIGHT).
+
+use encoding_rs::Encoding;
+use chardetng::EncodingDetector;
+
+/// Instantiates a Web browser-oriented detector for guessing what
+/// character encoding a stream of bytes is encoded in.
+///
+/// The bytes are fed to the detector incrementally using the
+/// `chardetng_encoding_detector_free` function. The current guess of the
+/// detector can be queried using the `chardetng_encoding_detector_guess`
+/// function. The guessing parameters are arguments to the
+/// `chardetng_encoding_detector_guess` function rather than arguments to the
+/// constructor in order to enable the application to check if the arguments
+/// affect the guessing outcome. (The specific use case is to disable UI for
+/// re-running the detector with UTF-8 allowed and the top-level domain name
+/// ignored if those arguments don't change the guess.)
+///
+/// The instantiated detector must be freed after use using
+/// `chardetng_detectordetector_free`.
+#[no_mangle]
+pub unsafe extern "C" fn chardetng_encoding_detector_new() -> *mut EncodingDetector {
+    Box::into_raw(Box::new(EncodingDetector::new()))
+}
+
+/// Deallocates a detector obtained from `chardetng_encodingdetector_new`.
+#[no_mangle]
+pub unsafe extern "C" fn chardetng_encoding_detector_free(detector: *mut EncodingDetector) {
+    let _ = Box::from_raw(detector);
+}
+
+/// Queries whether the TLD is considered non-generic and could affect the guess.
+///
+/// # Undefined Behavior
+///
+/// UB ensues if
+///
+/// * `tld` is non-NULL and `tld_len` is non-zero but `tld` and `tld_len`
+///   don't designate a range of memory valid for reading.
+#[no_mangle]
+pub unsafe extern "C" fn chardetng_encoding_detector_tld_may_affect_guess(
+    tld: *const u8,
+    tld_len: usize,
+) -> bool {
+    let tld_opt = if tld.is_null() {
+        assert_eq!(tld_len, 0);
+        None
+    } else {
+        Some(::std::slice::from_raw_parts(tld, tld_len))
+    };
+    EncodingDetector::tld_may_affect_guess(tld_opt)
+}
+
+/// Inform the detector of a chunk of input.
+///
+/// The byte stream is represented as a sequence of calls to this
+/// function such that the concatenation of the arguments to this
+/// function form the byte stream. It does not matter how the application
+/// chooses to chunk the stream. It is OK to call this function with
+/// a zero-length byte slice.
+///
+/// The end of the stream is indicated by calling this function with
+/// `last` set to `true`. In that case, the end of the stream is
+/// considered to occur after the last byte of the `buffer` (which
+/// may be zero-length) passed in the same call. Once this function
+/// has been called with `last` set to `true` this function must not
+/// be called again.
+///
+/// If you want to perform detection on just the prefix of a longer
+/// stream, do not pass `last=true` after the prefix if the stream
+/// actually still continues.
+///
+/// Returns `true` if after processing `buffer` the stream has
+/// contained at least one non-ASCII byte and `false` if only
+/// ASCII has been seen so far.
+///
+/// # Panics
+///
+/// If this function has previously been called with `last` set to `true`.
+///
+/// # Undefined Behavior
+///
+/// UB ensues if
+///
+/// * `detector` does not point to a detector obtained from
+///   `chardetng_detector_new` but not yet freed with
+///   `chardetng_detector_free`.
+/// * `buffer` is `NULL`. (It can be a bogus pointer when `buffer_len` is 0.)
+/// * ,buffer_len` is non-zero and `buffer` and `buffer_len` don't designate
+///    a range of memory valid for reading.
+#[no_mangle]
+pub unsafe extern "C" fn chardetng_encoding_detector_feed(
+    detector: *mut EncodingDetector,
+    buffer: *const u8,
+    buffer_len: usize,
+    last: bool,
+) -> bool {
+    (*detector).feed(::std::slice::from_raw_parts(buffer, buffer_len), last)
+}
+
+/// Guess the encoding given the bytes pushed to the detector so far
+/// (via `chardetng_encoding_detector_feed()`), the top-level domain name 
+/// from which the bytes were loaded, and an indication of whether to
+/// consider UTF-8 as a permissible guess.
+///
+/// The `tld` argument takes the rightmost DNS label of the hostname of the
+/// host the stream was loaded from in lower-case ASCII form. That is, if
+/// the label is an internationalized top-level domain name, it must be
+/// provided in its Punycode form. If the TLD that the stream was loaded
+/// from is unavalable, `NULL` may be passed instead (and 0 as `tld_len`),
+/// which is equivalent to passing pointer to "com" as `tld` and 3 as 
+/// `tld_len`.
+///
+/// If the `allow_utf8` argument is set to `false`, the return value of
+/// this function won't be `UTF_8_ENCODING`. When performing detection
+/// on `text/html` on non-`file:` URLs, Web browsers must pass `false`,
+/// unless the user has taken a specific contextual action to request an
+/// override. This way, Web developers cannot start depending on UTF-8
+/// detection. Such reliance would make the Web Platform more brittle.
+///
+/// Returns the guessed encoding (never `NULL`).
+///
+/// # Panics
+///
+/// If `tld` is `NULL` but `tld_len` is not zero.
+///
+/// If `tld` contains non-ASCII, period, or upper-case letters. (The panic
+/// condition is intentionally limited to signs of failing to extract the
+/// label correctly, failing to provide it in its Punycode form, and failure
+/// to lower-case it. Full DNS label validation is intentionally not performed
+/// to avoid panics when the reality doesn't match the specs.)
+///
+/// # Undefined Behavior
+///
+/// UB ensues if
+///
+/// * `detector` does not point to a detector obtained from
+///   `chardetng_detector_new` but not yet freed with
+///   `chardetng_detector_free`.
+/// * `tld` is non-NULL and `tld_len` is non-zero but `tld` and `tld_len`
+///   don't designate a range of memory valid for reading.
+#[no_mangle]
+pub unsafe extern "C" fn chardetng_encoding_detector_guess(
+    detector: *const EncodingDetector,
+    tld: *const u8,
+    tld_len: usize,
+    allow_utf8: bool,
+) -> *const Encoding {
+	let tld_opt = if tld.is_null() {
+		assert_eq!(tld_len, 0);
+		None
+	} else {
+		Some(::std::slice::from_raw_parts(tld, tld_len))
+	};
+	(*detector).guess(tld_opt, allow_utf8)
+}