utf-8-0.7.6/.cargo_vcs_info.json0000644000000001120000000000000120020ustar { "git": { "sha1": "9b4165786edaea2ef9cf48f75756537eacf7f20d" } } utf-8-0.7.6/.gitignore000064400000000000000000000000220000000000000125400ustar 00000000000000target Cargo.lock utf-8-0.7.6/Cargo.toml0000644000000015500000000000000100070ustar # 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 believe there's an error in this file please file an # issue against the rust-lang/cargo repository. If you're # editing this file be aware that the upstream Cargo.toml # will likely look very different (and much more reasonable) [package] name = "utf-8" version = "0.7.6" authors = ["Simon Sapin "] description = "Incremental, zero-copy UTF-8 decoding with error handling" license = "MIT OR Apache-2.0" repository = "https://github.com/SimonSapin/rust-utf8" [profile.bench] [profile.test] [lib] name = "utf8" test = false bench = false [dependencies] utf-8-0.7.6/Cargo.toml.orig000064400000000000000000000005710000000000000134500ustar 00000000000000[package] name = "utf-8" version = "0.7.6" authors = ["Simon Sapin "] description = "Incremental, zero-copy UTF-8 decoding with error handling" license = "MIT OR Apache-2.0" repository = "https://github.com/SimonSapin/rust-utf8" [lib] name = "utf8" test = false bench = false [dependencies] [profile.test] #opt-level = 3 [profile.bench] #debug = true utf-8-0.7.6/LICENSE-APACHE000064400000000000000000000227730000000000000125150ustar 00000000000000 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 utf-8-0.7.6/LICENSE-MIT000064400000000000000000000017770000000000000122260ustar 00000000000000Permission 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. utf-8-0.7.6/README.md000064400000000000000000000001450000000000000120350ustar 00000000000000# rust-utf8 Incremental, zero-copy UTF-8 decoding for Rust [Documentation](https://docs.rs/utf-8/) utf-8-0.7.6/benches/from_utf8_lossy.rs000064400000000000000000000015620000000000000157010ustar 00000000000000#![feature(test)] extern crate test; extern crate utf8; #[path = "../tests/shared/data.rs"] mod data; #[path = "../tests/shared/string_from_utf8_lossy.rs"] mod string_from_utf8_lossy; #[bench] fn bench_our_string_from_utf8_lossy(bencher: &mut test::Bencher) { bencher.bytes = data::DECODED_LOSSY.iter().map(|&(input, _expected)| input.len() as u64).sum(); bencher.iter(|| { for &(input, _expected) in data::DECODED_LOSSY { test::black_box(string_from_utf8_lossy::string_from_utf8_lossy(input)); } }) } #[bench] fn bench_std_string_from_utf8_lossy(bencher: &mut test::Bencher) { bencher.bytes = data::DECODED_LOSSY.iter().map(|&(input, _expected)| input.len() as u64).sum(); bencher.iter(|| { for &(input, _expected) in data::DECODED_LOSSY { test::black_box(String::from_utf8_lossy(input)); } }) } utf-8-0.7.6/src/lib.rs000064400000000000000000000144320000000000000124650ustar 00000000000000mod lossy; mod read; pub use lossy::LossyDecoder; pub use read::{BufReadDecoder, BufReadDecoderError}; use std::cmp; use std::error::Error; use std::fmt; use std::str; /// The replacement character, U+FFFD. In lossy decoding, insert it for every decoding error. pub const REPLACEMENT_CHARACTER: &'static str = "\u{FFFD}"; #[derive(Debug, Copy, Clone)] pub enum DecodeError<'a> { /// In lossy decoding insert `valid_prefix`, then `"\u{FFFD}"`, /// then call `decode()` again with `remaining_input`. Invalid { valid_prefix: &'a str, invalid_sequence: &'a [u8], remaining_input: &'a [u8], }, /// Call the `incomplete_suffix.try_complete` method with more input when available. /// If no more input is available, this is an invalid byte sequence. Incomplete { valid_prefix: &'a str, incomplete_suffix: Incomplete, }, } impl<'a> fmt::Display for DecodeError<'a> { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { match *self { DecodeError::Invalid { valid_prefix, invalid_sequence, remaining_input, } => write!( f, "found invalid byte sequence {invalid_sequence:02x?} after \ {valid_byte_count} valid bytes, followed by {unprocessed_byte_count} more \ unprocessed bytes", invalid_sequence = invalid_sequence, valid_byte_count = valid_prefix.len(), unprocessed_byte_count = remaining_input.len() ), DecodeError::Incomplete { valid_prefix, incomplete_suffix, } => write!( f, "found incomplete byte sequence {incomplete_suffix:02x?} after \ {valid_byte_count} bytes", incomplete_suffix = incomplete_suffix, valid_byte_count = valid_prefix.len() ), } } } impl<'a> Error for DecodeError<'a> {} #[derive(Debug, Copy, Clone)] pub struct Incomplete { pub buffer: [u8; 4], pub buffer_len: u8, } pub fn decode(input: &[u8]) -> Result<&str, DecodeError> { let error = match str::from_utf8(input) { Ok(valid) => return Ok(valid), Err(error) => error, }; // FIXME: separate function from here to guide inlining? let (valid, after_valid) = input.split_at(error.valid_up_to()); let valid = unsafe { str::from_utf8_unchecked(valid) }; match error.error_len() { Some(invalid_sequence_length) => { let (invalid, rest) = after_valid.split_at(invalid_sequence_length); Err(DecodeError::Invalid { valid_prefix: valid, invalid_sequence: invalid, remaining_input: rest }) } None => { Err(DecodeError::Incomplete { valid_prefix: valid, incomplete_suffix: Incomplete::new(after_valid), }) } } } impl Incomplete { pub fn empty() -> Self { Incomplete { buffer: [0, 0, 0, 0], buffer_len: 0, } } pub fn is_empty(&self) -> bool { self.buffer_len == 0 } pub fn new(bytes: &[u8]) -> Self { let mut buffer = [0, 0, 0, 0]; let len = bytes.len(); buffer[..len].copy_from_slice(bytes); Incomplete { buffer: buffer, buffer_len: len as u8, } } /// * `None`: still incomplete, call `try_complete` again with more input. /// If no more input is available, this is invalid byte sequence. /// * `Some((result, remaining_input))`: We’re done with this `Incomplete`. /// To keep decoding, pass `remaining_input` to `decode()`. pub fn try_complete<'input>(&mut self, input: &'input [u8]) -> Option<(Result<&str, &[u8]>, &'input [u8])> { let (consumed, opt_result) = self.try_complete_offsets(input); let result = opt_result?; let remaining_input = &input[consumed..]; let result_bytes = self.take_buffer(); let result = match result { Ok(()) => Ok(unsafe { str::from_utf8_unchecked(result_bytes) }), Err(()) => Err(result_bytes), }; Some((result, remaining_input)) } fn take_buffer(&mut self) -> &[u8] { let len = self.buffer_len as usize; self.buffer_len = 0; &self.buffer[..len as usize] } /// (consumed_from_input, None): not enough input /// (consumed_from_input, Some(Err(()))): error bytes in buffer /// (consumed_from_input, Some(Ok(()))): UTF-8 string in buffer fn try_complete_offsets(&mut self, input: &[u8]) -> (usize, Option>) { let initial_buffer_len = self.buffer_len as usize; let copied_from_input; { let unwritten = &mut self.buffer[initial_buffer_len..]; copied_from_input = cmp::min(unwritten.len(), input.len()); unwritten[..copied_from_input].copy_from_slice(&input[..copied_from_input]); } let spliced = &self.buffer[..initial_buffer_len + copied_from_input]; match str::from_utf8(spliced) { Ok(_) => { self.buffer_len = spliced.len() as u8; (copied_from_input, Some(Ok(()))) } Err(error) => { let valid_up_to = error.valid_up_to(); if valid_up_to > 0 { let consumed = valid_up_to.checked_sub(initial_buffer_len).unwrap(); self.buffer_len = valid_up_to as u8; (consumed, Some(Ok(()))) } else { match error.error_len() { Some(invalid_sequence_length) => { let consumed = invalid_sequence_length .checked_sub(initial_buffer_len).unwrap(); self.buffer_len = invalid_sequence_length as u8; (consumed, Some(Err(()))) } None => { self.buffer_len = spliced.len() as u8; (copied_from_input, None) } } } } } } } utf-8-0.7.6/src/lossy.rs000064400000000000000000000057110000000000000130700ustar 00000000000000use super::*; /// A push-based, lossy decoder for UTF-8. /// Errors are replaced with the U+FFFD replacement character. /// /// Users “push” bytes into the decoder, which in turn “pushes” `&str` slices into a callback. /// /// For example, `String::from_utf8_lossy` (but returning `String` instead of `Cow`) /// can be rewritten as: /// /// ```rust /// fn string_from_utf8_lossy(input: &[u8]) -> String { /// let mut string = String::new(); /// utf8::LossyDecoder::new(|s| string.push_str(s)).feed(input); /// string /// } /// ``` /// /// **Note:** Dropping the decoder signals the end of the input: /// If the last input chunk ended with an incomplete byte sequence for a code point, /// this is an error and a replacement character is emitted. /// Use `std::mem::forget` to inhibit this behavior. pub struct LossyDecoder { push_str: F, incomplete: Incomplete, } impl LossyDecoder { /// Create a new decoder from a callback. #[inline] pub fn new(push_str: F) -> Self { LossyDecoder { push_str: push_str, incomplete: Incomplete { buffer: [0, 0, 0, 0], buffer_len: 0, }, } } /// Feed one chunk of input into the decoder. /// /// The input is decoded lossily /// and the callback called once or more with `&str` string slices. /// /// If the UTF-8 byte sequence for one code point was split into this bytes chunk /// and previous bytes chunks, it will be correctly pieced back together. pub fn feed(&mut self, mut input: &[u8]) { if self.incomplete.buffer_len > 0 { match self.incomplete.try_complete(input) { Some((Ok(s), remaining)) => { (self.push_str)(s); input = remaining } Some((Err(_), remaining)) => { (self.push_str)(REPLACEMENT_CHARACTER); input = remaining } None => { return } } } loop { match decode(input) { Ok(s) => { (self.push_str)(s); return } Err(DecodeError::Incomplete { valid_prefix, incomplete_suffix }) => { (self.push_str)(valid_prefix); self.incomplete = incomplete_suffix; return } Err(DecodeError::Invalid { valid_prefix, remaining_input, .. }) => { (self.push_str)(valid_prefix); (self.push_str)(REPLACEMENT_CHARACTER); input = remaining_input } } } } } impl Drop for LossyDecoder { #[inline] fn drop(&mut self) { if self.incomplete.buffer_len > 0 { (self.push_str)(REPLACEMENT_CHARACTER) } } } utf-8-0.7.6/src/read.rs000064400000000000000000000136410000000000000126330ustar 00000000000000use std::io::{self, BufRead}; use std::error::Error; use std::fmt; use std::str; use super::*; /// Wraps a `std::io::BufRead` buffered byte stream and decode it as UTF-8. pub struct BufReadDecoder { buf_read: B, bytes_consumed: usize, incomplete: Incomplete, } #[derive(Debug)] pub enum BufReadDecoderError<'a> { /// Represents one UTF-8 error in the byte stream. /// /// In lossy decoding, each such error should be replaced with U+FFFD. /// (See `BufReadDecoder::next_lossy` and `BufReadDecoderError::lossy`.) InvalidByteSequence(&'a [u8]), /// An I/O error from the underlying byte stream Io(io::Error), } impl<'a> BufReadDecoderError<'a> { /// Replace UTF-8 errors with U+FFFD pub fn lossy(self) -> Result<&'static str, io::Error> { match self { BufReadDecoderError::Io(error) => Err(error), BufReadDecoderError::InvalidByteSequence(_) => Ok(REPLACEMENT_CHARACTER), } } } impl<'a> fmt::Display for BufReadDecoderError<'a> { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { match *self { BufReadDecoderError::InvalidByteSequence(bytes) => { write!(f, "invalid byte sequence: {:02x?}", bytes) } BufReadDecoderError::Io(ref err) => write!(f, "underlying bytestream error: {}", err), } } } impl<'a> Error for BufReadDecoderError<'a> { fn source(&self) -> Option<&(dyn Error + 'static)> { match *self { BufReadDecoderError::InvalidByteSequence(_) => None, BufReadDecoderError::Io(ref err) => Some(err), } } } impl BufReadDecoder { /// This is to `Read::read_to_string` what `String::from_utf8_lossy` is to `String::from_utf8`. pub fn read_to_string_lossy(buf_read: B) -> io::Result { let mut decoder = Self::new(buf_read); let mut string = String::new(); while let Some(result) = decoder.next_lossy() { string.push_str(result?) } Ok(string) } pub fn new(buf_read: B) -> Self { Self { buf_read, bytes_consumed: 0, incomplete: Incomplete::empty(), } } /// Same as `BufReadDecoder::next_strict`, but replace UTF-8 errors with U+FFFD. pub fn next_lossy(&mut self) -> Option> { self.next_strict().map(|result| result.or_else(|e| e.lossy())) } /// Decode and consume the next chunk of UTF-8 input. /// /// This method is intended to be called repeatedly until it returns `None`, /// which represents EOF from the underlying byte stream. /// This is similar to `Iterator::next`, /// except that decoded chunks borrow the decoder (~iterator) /// so they need to be handled or copied before the next chunk can start decoding. pub fn next_strict(&mut self) -> Option> { enum BytesSource { BufRead(usize), Incomplete, } macro_rules! try_io { ($io_result: expr) => { match $io_result { Ok(value) => value, Err(error) => return Some(Err(BufReadDecoderError::Io(error))) } } } let (source, result) = loop { if self.bytes_consumed > 0 { self.buf_read.consume(self.bytes_consumed); self.bytes_consumed = 0; } let buf = try_io!(self.buf_read.fill_buf()); // Force loop iteration to go through an explicit `continue` enum Unreachable {} let _: Unreachable = if self.incomplete.is_empty() { if buf.is_empty() { return None // EOF } match str::from_utf8(buf) { Ok(_) => { break (BytesSource::BufRead(buf.len()), Ok(())) } Err(error) => { let valid_up_to = error.valid_up_to(); if valid_up_to > 0 { break (BytesSource::BufRead(valid_up_to), Ok(())) } match error.error_len() { Some(invalid_sequence_length) => { break (BytesSource::BufRead(invalid_sequence_length), Err(())) } None => { self.bytes_consumed = buf.len(); self.incomplete = Incomplete::new(buf); // need more input bytes continue } } } } } else { if buf.is_empty() { break (BytesSource::Incomplete, Err(())) // EOF with incomplete code point } let (consumed, opt_result) = self.incomplete.try_complete_offsets(buf); self.bytes_consumed = consumed; match opt_result { None => { // need more input bytes continue } Some(result) => { break (BytesSource::Incomplete, result) } } }; }; let bytes = match source { BytesSource::BufRead(byte_count) => { self.bytes_consumed = byte_count; let buf = try_io!(self.buf_read.fill_buf()); &buf[..byte_count] } BytesSource::Incomplete => { self.incomplete.take_buffer() } }; match result { Ok(()) => Some(Ok(unsafe { str::from_utf8_unchecked(bytes) })), Err(()) => Some(Err(BufReadDecoderError::InvalidByteSequence(bytes))), } } } utf-8-0.7.6/tests/unit.rs000064400000000000000000000145410000000000000132520ustar 00000000000000extern crate utf8; use std::borrow::Cow; use std::collections::VecDeque; use std::io; use utf8::*; /// A re-implementation of std::str::from_utf8 pub fn str_from_utf8(input: &[u8]) -> Result<&str, usize> { match decode(input) { Ok(s) => return Ok(s), Err(DecodeError::Invalid { valid_prefix, .. }) | Err(DecodeError::Incomplete { valid_prefix, .. }) => Err(valid_prefix.len()), } } #[test] fn test_str_from_utf8() { let xs = b"hello"; assert_eq!(str_from_utf8(xs), Ok("hello")); let xs = "ศไทย中华Việt Nam".as_bytes(); assert_eq!(str_from_utf8(xs), Ok("ศไทย中华Việt Nam")); let xs = b"hello\xFF"; assert!(str_from_utf8(xs).is_err()); } #[test] fn test_is_utf8() { // Chars of 1, 2, 3, and 4 bytes assert!(str_from_utf8("eé€\u{10000}".as_bytes()).is_ok()); // invalid prefix assert!(str_from_utf8(&[0x80]).is_err()); // invalid 2 byte prefix assert!(str_from_utf8(&[0xc0]).is_err()); assert!(str_from_utf8(&[0xc0, 0x10]).is_err()); // invalid 3 byte prefix assert!(str_from_utf8(&[0xe0]).is_err()); assert!(str_from_utf8(&[0xe0, 0x10]).is_err()); assert!(str_from_utf8(&[0xe0, 0xff, 0x10]).is_err()); // invalid 4 byte prefix assert!(str_from_utf8(&[0xf0]).is_err()); assert!(str_from_utf8(&[0xf0, 0x10]).is_err()); assert!(str_from_utf8(&[0xf0, 0xff, 0x10]).is_err()); assert!(str_from_utf8(&[0xf0, 0xff, 0xff, 0x10]).is_err()); // deny overlong encodings assert!(str_from_utf8(&[0xc0, 0x80]).is_err()); assert!(str_from_utf8(&[0xc0, 0xae]).is_err()); assert!(str_from_utf8(&[0xe0, 0x80, 0x80]).is_err()); assert!(str_from_utf8(&[0xe0, 0x80, 0xaf]).is_err()); assert!(str_from_utf8(&[0xe0, 0x81, 0x81]).is_err()); assert!(str_from_utf8(&[0xf0, 0x82, 0x82, 0xac]).is_err()); assert!(str_from_utf8(&[0xf4, 0x90, 0x80, 0x80]).is_err()); // deny surrogates assert!(str_from_utf8(&[0xED, 0xA0, 0x80]).is_err()); assert!(str_from_utf8(&[0xED, 0xBF, 0xBF]).is_err()); assert!(str_from_utf8(&[0xC2, 0x80]).is_ok()); assert!(str_from_utf8(&[0xDF, 0xBF]).is_ok()); assert!(str_from_utf8(&[0xE0, 0xA0, 0x80]).is_ok()); assert!(str_from_utf8(&[0xED, 0x9F, 0xBF]).is_ok()); assert!(str_from_utf8(&[0xEE, 0x80, 0x80]).is_ok()); assert!(str_from_utf8(&[0xEF, 0xBF, 0xBF]).is_ok()); assert!(str_from_utf8(&[0xF0, 0x90, 0x80, 0x80]).is_ok()); assert!(str_from_utf8(&[0xF4, 0x8F, 0xBF, 0xBF]).is_ok()); } /// A re-implementation of String::from_utf8_lossy pub fn string_from_utf8_lossy(input: &[u8]) -> Cow { let mut result = decode(input); if let Ok(s) = result { return s.into() } let mut string = String::with_capacity(input.len() + REPLACEMENT_CHARACTER.len()); loop { match result { Ok(s) => { string.push_str(s); return string.into() } Err(DecodeError::Incomplete { valid_prefix, .. }) => { string.push_str(valid_prefix); string.push_str(REPLACEMENT_CHARACTER); return string.into() } Err(DecodeError::Invalid { valid_prefix, remaining_input, .. }) => { string.push_str(valid_prefix); string.push_str(REPLACEMENT_CHARACTER); result = decode(remaining_input); } } } } pub const DECODED_LOSSY: &'static [(&'static [u8], &'static str)] = &[ (b"hello", "hello"), (b"\xe0\xb8\xa8\xe0\xb9\x84\xe0\xb8\x97\xe0\xb8\xa2\xe4\xb8\xad\xe5\x8d\x8e", "ศไทย中华"), (b"Vi\xe1\xbb\x87t Nam", "Việt Nam"), (b"Hello\xC2 There\xFF ", "Hello\u{FFFD} There\u{FFFD} "), (b"Hello\xC0\x80 There", "Hello\u{FFFD}\u{FFFD} There"), (b"\xE6\x83 Goodbye", "\u{FFFD} Goodbye"), (b"\xF5foo\xF5\x80bar", "\u{FFFD}foo\u{FFFD}\u{FFFD}bar"), (b"\xF5foo\xF5\xC2", "\u{FFFD}foo\u{FFFD}\u{FFFD}"), (b"\xF1foo\xF1\x80bar\xF1\x80\x80baz", "\u{FFFD}foo\u{FFFD}bar\u{FFFD}baz"), (b"\xF4foo\xF4\x80bar\xF4\xBFbaz", "\u{FFFD}foo\u{FFFD}bar\u{FFFD}\u{FFFD}baz"), (b"\xF0\x80\x80\x80foo\xF0\x90\x80\x80bar", "\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}foo\u{10000}bar"), (b"\xF0\x90\x80foo", "\u{FFFD}foo"), // surrogates (b"\xED\xA0\x80foo\xED\xBF\xBFbar", "\u{FFFD}\u{FFFD}\u{FFFD}foo\u{FFFD}\u{FFFD}\u{FFFD}bar"), ]; #[test] fn test_string_from_utf8_lossy() { for &(input, expected) in DECODED_LOSSY { assert_eq!(string_from_utf8_lossy(input), expected); } } pub fn all_partitions<'a, F>(input: &'a [u8], f: F) where F: Fn(&[&[u8]]) { fn all_partitions_inner<'a, F>(chunks: &mut Vec<&'a [u8]>, input: &'a [u8], f: &F) where F: Fn(&[&[u8]]) { if input.is_empty() { f(chunks) } for i in 1..(input.len() + 1) { chunks.push(&input[..i]); all_partitions_inner(chunks, &input[i..], f); chunks.pop(); } } let mut chunks = Vec::new(); all_partitions_inner(&mut chunks, input, &f); assert_eq!(chunks.len(), 0); } #[test] fn test_incremental_decoder() { for &(input, expected) in DECODED_LOSSY { all_partitions(input, |chunks| { let mut string = String::new(); { let mut decoder = LossyDecoder::new(|s| string.push_str(s)); for &chunk in &*chunks { decoder.feed(chunk); } } assert_eq!(string, expected); }); } } #[test] fn test_bufread_decoder() { for &(input, expected) in DECODED_LOSSY { all_partitions(input, |chunks| { let chunks = Chunks(chunks.to_vec().into()); let string = BufReadDecoder::read_to_string_lossy(chunks).unwrap(); assert_eq!(string, expected) }); } } struct Chunks<'a>(VecDeque<&'a [u8]>); impl<'a> io::Read for Chunks<'a> { fn read(&mut self, _: &mut [u8]) -> io::Result { unimplemented!() } } impl<'a> io::BufRead for Chunks<'a> { fn fill_buf(&mut self) -> io::Result<&[u8]> { Ok(*self.0.front().unwrap()) } fn consume(&mut self, bytes: usize) { { let front = self.0.front_mut().unwrap(); *front = &front[bytes..]; if !front.is_empty() { return } } if self.0.len() > 1 { self.0.pop_front(); } } }