--- a/Cargo.lock
+++ b/Cargo.lock
@@ -625,31 +625,31 @@ name = "ena"
version = "0.5.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "encoding_c"
version = "0.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
- "encoding_rs 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "encoding_rs 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "encoding_glue"
version = "0.1.0"
dependencies = [
- "encoding_rs 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "encoding_rs 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
"nserror 0.1.0",
"nsstring 0.1.0",
]
[[package]]
name = "encoding_rs"
-version = "0.8.0"
+version = "0.8.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
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]
[[package]]
name = "env_logger"
@@ -2546,17 +2546,17 @@ dependencies = [
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\ No newline at end of file
+{"files":{".travis.yml":"262b9925451db996c31e4bb8bb6bbdb36c3f6009f407db5ed4b0ed25cd72d8c8","CONTRIBUTING.md":"0d4bfb1068c2b2f32b7bc7833662dfff628d86b0f31068266027c719fb727360","COPYRIGHT":"20d4fff11cca11529df3f02096fbe8ffe350219cdb07cdedea34e6a762866da5","Cargo.toml":"2e1a7590a783bfc137d626f1e9b9611aa90dbc130fcf8608a1c40d25a2e40685","Ideas.md":"7fbeddb0f8ba7b233673ee705997adc2fddb1636a17fe662532b35ef2810a51d","LICENSE-APACHE":"cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30","LICENSE-MIT":"74aa8b6d04c36bb640ee81187a3f24a2fa94e36d4c1d4f2ca164c3784ae87a83","README.md":"51ae50670105f27828c80f413c18b15604df98f25642fca93f4a6d489768c908","doc/Big5.txt":"f73a2edc5cb6c2d140ba6e07f4542e1c4a234950378acde1df93480f0ca0be0b","doc/EUC-JP.txt":"ee2818b907d0137f40a9ab9fd525fc700a44dbdddb6cf0c157a656566bae4bf1","doc/EUC-KR.txt":"71d9e2ccf3b124e8bdfb433c8cf2773fd878077038d0cec3c7237a50f4a78a30","doc/GBK.txt":"c1b522b5a799884e5001da661f42c5a8f4d0acb9ef1d74b206f22b5f65365606","doc/IBM866.txt":"a5a433e804d0f83af785015179fbc1d9b0eaf1f7960efcd04093e136b51fbd0e","doc/ISO-2022-JP.txt":"af86684f5a8f0e2868d7b2c292860140c3d2e5527530ca091f1b28198e8e2fe6","doc/ISO-8859-10.txt":"6d3949ad7c81ca176895101ed81a1db7df1060d64e262880b94bd31bb344ab4d","doc/ISO-8859-13.txt":"3951dd89cf93f7729148091683cf8511f4529388b7dc8dcd0d62eaed55be93fa","doc/ISO-8859-14.txt":"3d330784a0374fd255a38b47949675cc7168c800530534b0a01cac6edc623adc","doc/ISO-8859-15.txt":"24b1084aab5127a85aab99153f86e24694d0a3615f53b5ce23683f97cf66c47a","doc/ISO-8859-16.txt":"ce0272559b92ba76d7a7e476f6424ae4a5cc72e75b183611b08392e44add4d25","doc/ISO-8859-2.txt":"18ceff88c13d1b5ba455a3919b1e3de489045c4c3d2dd7e8527c125c75d54aad","doc/ISO-8859-3.txt":"21798404c68f4f5db59223362f24999da96968c0628427321fccce7d2849a130","doc/ISO-8859-4.txt":"d27f6520c6c5bfbcc19176b71d081cdb3bccde1622bb3e420d5680e812632d53","doc/ISO-8859-5.txt":"a10ec8d6ea7a78ad15da7275f6cb1a3365118527e28f9af6d0d5830501303f3a","doc/ISO-8859-6.txt":"ccda8a2efc96115336bdd77776637b9712425e44fbcf745353b9057fbef144e7","doc/ISO-8859-7.txt":"17900fa1f27a445958f0a77d7d9056be375a6bd7ee4492aa680c7c1500bab85e","doc/ISO-8859-8-I.txt":"8357555646d54265a9b9ffa3e68b08d132312f1561c60108ff9b8b1167b6ecf2","doc/ISO-8859-8.txt":"72cd6f3afb7b4a9c16a66a362473315770b7755d72c86c870e52fc3eba86c8af","doc/KOI8-R.txt":"839cf19a38da994488004ed7814b1f6151640156a9a2af02bf2efca745fb5966","doc/KOI8-U.txt":"0cc76624ed1f024183e2298b7e019957da2c70c8ca06e0fc4e6f353f50a5054f","doc/Shift_JIS.txt":"34c49141818cb9ddbcf59cc858f78a79be8ad148d563f26415108ae1f148443f","doc/UTF-16BE.txt":"e2e280d8acbaa6d2a6b3569d60e17500a285f2baa0df3363dd85537cd5a1ef8f","doc/UTF-16LE.txt":"70bdc170e3fc5298ba68f10125fb5eeb8b077036cc96bb4416c4de396f6d76c1","doc/UTF-8.txt":"ea7bae742e613010ced002cf4b601a737d2203fad65e115611451bc4428f548a","doc/gb18030.txt":"dc71378a8f07a2d8659f69ee81fb8791fef56ba86f124b429978285237bb4a7b","doc/macintosh.txt":"57491e53866711b4672d9b9ff35380b9dac9e0d8e3d6c20bdd6140603687c023","doc/replacement.txt":"4b6c3bbd7999d9d4108a281594bd02d13607e334a95465afff8c2c08d395f0e4","doc/windows-1250.txt":"61296bb6a21cdab602300d32ecfba434cb82de5ac3bc88d58710d2f125e28d39","doc/windows-1251.txt":"7deea1c61dea1485c8ff02db2c7d578db7a9aab63ab1cfd02ec04b515864689e","doc/windows-1252.txt":"933ef3bdddfce5ee132b9f1a1aa8b47423d2587bbe475b19028d0a6d38e180b6","doc/windows-1253.txt":"1a38748b88e99071a5c7b3d5456ead4caedeabab50d50d658be105bc113714de","doc/windows-1254.txt":"f8372f86c6f8d642563cd6ddc025260553292a39423df1683a98670bd7bf2b47","doc/windows-1255.txt":"4e5852494730054e2da258a74e1b9d780abbcdd8ce22ebc218ca2efe9e90493d","doc/windows-1256.txt":"c0879c5172abedead302a406e8f60d9cd9598694a0ffa4fd288ffe4fef7b8ea1","doc/windows-1257.txt":"c28a0c9f964fcb2b46d21f537c402446501a2800670481d6abf9fd9e9018d523","doc/windows-1258.txt":"5019ae4d61805c79aacbf17c93793342dbb098d65a1837783bc3e2c6d6a23602","doc/windows-874.txt":"4ef0e4501c5feba8b17aee1818602ed44b36ca8475db771ce2fc16d392cabecc","doc/x-mac-cyrillic.txt":"58be154d8a888ca3d484b83b44f749823ef339ab27f14d90ca9a856f5050a8bd","doc/x-user-defined.txt":"f9cd07c4321bf5cfb0be4bdddd251072999b04a6cf7a6f5bc63709a84e2c1ffc","generate-encoding-data.py":"bbe134cc013a17c32bd51e868a2ee4f2c3e2205e40afb9fc60f98fa9758961b8","rustfmt.toml":"85c1a3b4382fd89e991cbb81b70fb52780472edc064c963943cdaaa56e0a2030","src/ascii.rs":"616bed165d244096d944e2d746405ec9fa671ba5fff1528a89172ea52f3a2975","src/big5.rs":"659ddb66f82142468774715cd9ecdc8356005fec9d91e46d54ae2280a88adb4b","src/data.rs":"18793e23f98d9aba1ed2858c43b2103c9c05a8571429b2128510c68d05ba8cb6","src/euc_jp.rs":"b178172274af1a6be38d388e5a2468e7140e9facf63d2f679f4ed77c3fc20a92","src/euc_kr.rs":"e27bd9c4e2172bb02004dd2a1fcbe02118415a1aec6a90b5632c9eac6f12ba7d","src/gb18030.rs":"752869f47ad0cad02ad3ccb6fde3eb277fa528e10e3d9432a90563db610d9dc2","src/handles.rs":"0598439bf66bd26699cba7e9e2fec001f8c57f3a510578fc3cc118ddc36d6831","src/iso_2022_jp.rs":"d904a92d49fc5878e6cb82a21185051c801489cf2800db8f37269965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\ No newline at end of file
--- a/third_party/rust/encoding_rs/Cargo.toml
+++ b/third_party/rust/encoding_rs/Cargo.toml
@@ -7,17 +7,17 @@
#
# 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 = "encoding_rs"
-version = "0.8.0"
+version = "0.8.1"
authors = ["Henri Sivonen <hsivonen@hsivonen.fi>"]
description = "A Gecko-oriented implementation of the Encoding Standard"
homepage = "https://docs.rs/encoding_rs/"
documentation = "https://docs.rs/encoding_rs/"
readme = "README.md"
keywords = ["encoding", "web", "unicode", "charset"]
categories = ["text-processing", "encoding", "web-programming", "email"]
license = "MIT/Apache-2.0"
--- a/third_party/rust/encoding_rs/README.md
+++ b/third_party/rust/encoding_rs/README.md
@@ -232,16 +232,22 @@ used in Firefox.
- [x] Add SIMD acceleration for Aarch64.
- [x] Investigate the use of NEON on 32-bit ARM.
- [ ] Investigate Björn Höhrmann's lookup table acceleration for UTF-8 as
adapted to Rust in rust-encoding.
- [ ] Add actually fast CJK encode options.
## Release Notes
+### 0.8.1
+
+* Tweaked loop unrolling and memory alignment for SSE2 conversions between
+ UTF-16 and Latin1 in the `mem` module to increase the performance when
+ converting long buffers.
+
### 0.8.0
* Changed the minimum supported version of Rust to 1.21.0 (semver breaking
change).
* Flipped around the defaults vs. optional features for controlling the size
vs. speed trade-off for Kanji and Hanzi legacy encode (semver breaking
change).
* Added NEON support on ARMv7.
--- a/third_party/rust/encoding_rs/src/ascii.rs
+++ b/third_party/rust/encoding_rs/src/ascii.rs
@@ -404,21 +404,16 @@ macro_rules! latin1_simd_check_align {
$stride_dst_aligned:ident,
$stride_neither_aligned:ident
) => {
#[inline(always)]
pub unsafe fn $name(src: *const $src_unit, dst: *mut $dst_unit, len: usize) {
let mut offset = 0usize;
if SIMD_STRIDE_SIZE <= len {
let len_minus_stride = len - SIMD_STRIDE_SIZE;
- // XXX Should we first process one stride unconditionally as unaligned to
- // avoid the cost of the branchiness below if the first stride fails anyway?
- // XXX Should we just use unaligned SSE2 access unconditionally? It seems that
- // on Haswell, it would make sense to just use unaligned and not bother
- // checking. Need to benchmark older architectures before deciding.
let dst_masked = (dst as usize) & SIMD_ALIGNMENT_MASK;
if ((src as usize) & SIMD_ALIGNMENT_MASK) == 0 {
if dst_masked == 0 {
loop {
$stride_both_aligned(
src.offset(offset as isize),
dst.offset(offset as isize),
);
@@ -462,16 +457,93 @@ macro_rules! latin1_simd_check_align {
break;
}
}
}
}
}
while offset < len {
let code_unit = *(src.offset(offset as isize));
+ *(dst.offset(offset as isize)) = code_unit as $dst_unit;
+ offset += 1;
+ }
+ }
+ };
+}
+
+#[allow(unused_macros)]
+macro_rules! latin1_simd_check_align_unrolled {
+ (
+ $name:ident,
+ $src_unit:ty,
+ $dst_unit:ty,
+ $stride_both_aligned:ident,
+ $stride_src_aligned:ident,
+ $stride_dst_aligned:ident,
+ $stride_neither_aligned:ident
+ ) => {
+ #[inline(always)]
+ pub unsafe fn $name(src: *const $src_unit, dst: *mut $dst_unit, len: usize) {
+ let unit_size = ::std::mem::size_of::<$src_unit>();
+ let mut offset = 0usize;
+ if SIMD_STRIDE_SIZE <= len {
+ let mut until_alignment = ((SIMD_STRIDE_SIZE - ((src as usize) & SIMD_ALIGNMENT_MASK))
+ & SIMD_ALIGNMENT_MASK) / unit_size;
+ while until_alignment != 0 {
+ *(dst.offset(offset as isize)) = *(src.offset(offset as isize)) as $dst_unit;
+ offset += 1;
+ until_alignment -= 1;
+ }
+ let len_minus_stride = len - SIMD_STRIDE_SIZE;
+ if SIMD_STRIDE_SIZE * 2 <= len {
+ let len_minus_stride_times_two = len_minus_stride - SIMD_STRIDE_SIZE;
+ if (dst.offset(offset as isize) as usize) & SIMD_ALIGNMENT_MASK == 0 {
+ loop {
+ $stride_both_aligned(
+ src.offset(offset as isize),
+ dst.offset(offset as isize),
+ );
+ offset += SIMD_STRIDE_SIZE;
+ $stride_both_aligned(
+ src.offset(offset as isize),
+ dst.offset(offset as isize),
+ );
+ offset += SIMD_STRIDE_SIZE;
+ if offset > len_minus_stride_times_two {
+ break;
+ }
+ }
+ } else {
+ loop {
+ $stride_src_aligned(
+ src.offset(offset as isize),
+ dst.offset(offset as isize),
+ );
+ offset += SIMD_STRIDE_SIZE;
+ $stride_src_aligned(
+ src.offset(offset as isize),
+ dst.offset(offset as isize),
+ );
+ offset += SIMD_STRIDE_SIZE;
+ if offset > len_minus_stride_times_two {
+ break;
+ }
+ }
+ }
+ }
+ if offset < len_minus_stride {
+ $stride_src_aligned(
+ src.offset(offset as isize),
+ dst.offset(offset as isize),
+ );
+ offset += SIMD_STRIDE_SIZE;
+ }
+ }
+ while offset < len {
+ let code_unit = *(src.offset(offset as isize));
// On x86_64, this loop autovectorizes but in the pack
// case there are instructions whose purpose is to make sure
// each u16 in the vector is truncated before packing. However,
// since we don't care about saturating behavior of SSE2 packing
// when the input isn't Latin1, those instructions are useless.
// Unfortunately, using the `assume` intrinsic to lie to the
// optimizer doesn't make LLVM omit the trunctation that we
// don't need. Possibly this loop could be manually optimized
@@ -645,17 +717,17 @@ cfg_if! {
basic_latin_to_ascii_simd_stride!(basic_latin_to_ascii_stride_neither_aligned, load8_unaligned, store16_unaligned);
pack_simd_stride!(pack_stride_neither_aligned, load8_unaligned, store16_unaligned);
ascii_simd_unalign!(ascii_to_ascii, u8, u8, ascii_to_ascii_stride_neither_aligned);
ascii_simd_unalign!(ascii_to_basic_latin, u8, u16, ascii_to_basic_latin_stride_neither_aligned);
ascii_simd_unalign!(basic_latin_to_ascii, u16, u8, basic_latin_to_ascii_stride_neither_aligned);
latin1_simd_unalign!(unpack_latin1, u8, u16, unpack_stride_neither_aligned);
latin1_simd_unalign!(pack_latin1, u16, u8, pack_stride_neither_aligned);
- } else if #[cfg(all(feature = "simd-accel", any(target_feature = "sse2", all(target_endian = "little", target_feature = "neon"))))] {
+ } else if #[cfg(all(feature = "simd-accel", target_endian = "little", target_feature = "neon"))] {
// SIMD with different instructions for aligned and unaligned loads and stores.
//
// Newer microarchitectures are not supposed to have a performance difference between
// aligned and unaligned SSE2 loads and stores when the address is actually aligned,
// but the benchmark results I see don't agree.
pub const SIMD_STRIDE_SIZE: usize = 16;
@@ -688,16 +760,55 @@ cfg_if! {
pack_simd_stride!(pack_stride_dst_aligned, load8_unaligned, store16_aligned);
pack_simd_stride!(pack_stride_neither_aligned, load8_unaligned, store16_unaligned);
ascii_simd_check_align!(ascii_to_ascii, u8, u8, ascii_to_ascii_stride_both_aligned, ascii_to_ascii_stride_src_aligned, ascii_to_ascii_stride_dst_aligned, ascii_to_ascii_stride_neither_aligned);
ascii_simd_check_align!(ascii_to_basic_latin, u8, u16, ascii_to_basic_latin_stride_both_aligned, ascii_to_basic_latin_stride_src_aligned, ascii_to_basic_latin_stride_dst_aligned, ascii_to_basic_latin_stride_neither_aligned);
ascii_simd_check_align!(basic_latin_to_ascii, u16, u8, basic_latin_to_ascii_stride_both_aligned, basic_latin_to_ascii_stride_src_aligned, basic_latin_to_ascii_stride_dst_aligned, basic_latin_to_ascii_stride_neither_aligned);
latin1_simd_check_align!(unpack_latin1, u8, u16, unpack_stride_both_aligned, unpack_stride_src_aligned, unpack_stride_dst_aligned, unpack_stride_neither_aligned);
latin1_simd_check_align!(pack_latin1, u16, u8, pack_stride_both_aligned, pack_stride_src_aligned, pack_stride_dst_aligned, pack_stride_neither_aligned);
+ } else if #[cfg(all(feature = "simd-accel", target_feature = "sse2"))] {
+ // SIMD with different instructions for aligned and unaligned loads and stores.
+ //
+ // Newer microarchitectures are not supposed to have a performance difference between
+ // aligned and unaligned SSE2 loads and stores when the address is actually aligned,
+ // but the benchmark results I see don't agree.
+
+ pub const SIMD_STRIDE_SIZE: usize = 16;
+
+ pub const MAX_STRIDE_SIZE: usize = 16;
+
+ pub const SIMD_ALIGNMENT_MASK: usize = 15;
+
+ ascii_to_ascii_simd_stride!(ascii_to_ascii_stride_both_aligned, load16_aligned, store16_aligned);
+ ascii_to_ascii_simd_stride!(ascii_to_ascii_stride_src_aligned, load16_aligned, store16_unaligned);
+ ascii_to_ascii_simd_stride!(ascii_to_ascii_stride_dst_aligned, load16_unaligned, store16_aligned);
+ ascii_to_ascii_simd_stride!(ascii_to_ascii_stride_neither_aligned, load16_unaligned, store16_unaligned);
+
+ ascii_to_basic_latin_simd_stride!(ascii_to_basic_latin_stride_both_aligned, load16_aligned, store8_aligned);
+ ascii_to_basic_latin_simd_stride!(ascii_to_basic_latin_stride_src_aligned, load16_aligned, store8_unaligned);
+ ascii_to_basic_latin_simd_stride!(ascii_to_basic_latin_stride_dst_aligned, load16_unaligned, store8_aligned);
+ ascii_to_basic_latin_simd_stride!(ascii_to_basic_latin_stride_neither_aligned, load16_unaligned, store8_unaligned);
+
+ unpack_simd_stride!(unpack_stride_both_aligned, load16_aligned, store8_aligned);
+ unpack_simd_stride!(unpack_stride_src_aligned, load16_aligned, store8_unaligned);
+
+ basic_latin_to_ascii_simd_stride!(basic_latin_to_ascii_stride_both_aligned, load8_aligned, store16_aligned);
+ basic_latin_to_ascii_simd_stride!(basic_latin_to_ascii_stride_src_aligned, load8_aligned, store16_unaligned);
+ basic_latin_to_ascii_simd_stride!(basic_latin_to_ascii_stride_dst_aligned, load8_unaligned, store16_aligned);
+ basic_latin_to_ascii_simd_stride!(basic_latin_to_ascii_stride_neither_aligned, load8_unaligned, store16_unaligned);
+
+ pack_simd_stride!(pack_stride_both_aligned, load8_aligned, store16_aligned);
+ pack_simd_stride!(pack_stride_src_aligned, load8_aligned, store16_unaligned);
+
+ ascii_simd_check_align!(ascii_to_ascii, u8, u8, ascii_to_ascii_stride_both_aligned, ascii_to_ascii_stride_src_aligned, ascii_to_ascii_stride_dst_aligned, ascii_to_ascii_stride_neither_aligned);
+ ascii_simd_check_align!(ascii_to_basic_latin, u8, u16, ascii_to_basic_latin_stride_both_aligned, ascii_to_basic_latin_stride_src_aligned, ascii_to_basic_latin_stride_dst_aligned, ascii_to_basic_latin_stride_neither_aligned);
+ ascii_simd_check_align!(basic_latin_to_ascii, u16, u8, basic_latin_to_ascii_stride_both_aligned, basic_latin_to_ascii_stride_src_aligned, basic_latin_to_ascii_stride_dst_aligned, basic_latin_to_ascii_stride_neither_aligned);
+ latin1_simd_check_align_unrolled!(unpack_latin1, u8, u16, unpack_stride_both_aligned, unpack_stride_src_aligned, unpack_stride_dst_aligned, unpack_stride_neither_aligned);
+ latin1_simd_check_align_unrolled!(pack_latin1, u16, u8, pack_stride_both_aligned, pack_stride_src_aligned, pack_stride_dst_aligned, pack_stride_neither_aligned);
} else if #[cfg(all(target_endian = "little", target_pointer_width = "64"))] {
// Aligned ALU word, little-endian, 64-bit
pub const ALU_STRIDE_SIZE: usize = 16;
pub const MAX_STRIDE_SIZE: usize = 16;
pub const ALU_ALIGNMENT: usize = 8;
--- a/third_party/rust/encoding_rs/src/lib.rs
+++ b/third_party/rust/encoding_rs/src/lib.rs
@@ -3,17 +3,17 @@
//
// 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.
#![cfg_attr(feature = "cargo-clippy", allow(doc_markdown, inline_always, new_ret_no_self))]
-#![doc(html_root_url = "https://docs.rs/encoding_rs/0.8.0")]
+#![doc(html_root_url = "https://docs.rs/encoding_rs/0.8.1")]
//! encoding_rs is a Gecko-oriented Free Software / Open Source implementation
//! of the [Encoding Standard](https://encoding.spec.whatwg.org/) in Rust.
//! Gecko-oriented means that converting to and from UTF-16 is supported in
//! addition to converting to and from UTF-8, that the performance and
//! streamability goals are browser-oriented, and that FFI-friendliness is a
//! goal.
//!
@@ -215,28 +215,30 @@
//!
//! Deemphasizing performance of encoding non-Basic Latin text into legacy
//! encodings enables smaller code size thanks to the encoder side using the
//! decode-optimized data tables without having encode-optimized data tables at
//! all. Even in decoders, smaller lookup table size is preferred over avoiding
//! multiplication operations.
//!
//! Additionally, performance is a non-goal for the ASCII-incompatible
-//! ISO-2022-JP and UTF-16 encodings, which are rarely used on the Web. For
-//! clarity, this means that performance is a non-goal for UTF-16 as used on
-//! the wire as an interchange encoding (UTF-16 on the `[u8]` side of the API).
-//! Good performance for UTF-16 used as an in-RAM Unicode representation
-//! (UTF-16 the `[u16]` side of the API) is a goal.
+//! ISO-2022-JP encoding, which are rarely used on the Web. Instead of
+//! performance, the decoder for ISO-2022-JP optimizes for ease/clarity
+//! of implementation.
//!
//! Despite the focus on the Web, encoding_rs may well be useful for decoding
//! email, although you'll need to implement UTF-7 decoding and label handling
//! by other means. (Due to the Web focus, patches to add UTF-7 are unwelcome
//! in encoding_rs itself.) Also, despite the browser focus, the hope is that
//! non-browser applications that wish to consume Web content or submit Web
-//! forms in a Web-compatible way will find encoding_rs useful.
+//! forms in a Web-compatible way will find encoding_rs useful. While
+//! encoding_rs does not try to match Windows behavior, many of the encodings
+//! are close enough to legacy encodings implemented by Windows that
+//! applications that need to consume data in legacy Windows encodins may
+//! find encoding_rs useful.
//!
//! # Streaming & Non-Streaming; Rust & C/C++
//!
//! The API in Rust has two modes of operation: streaming and non-streaming.
//! The streaming API is the foundation of the implementation and should be
//! used when processing data that arrives piecemeal from an i/o stream. The
//! streaming API has an FFI wrapper (as a [separate crate][1]) that exposes it
//! to C callers. The non-streaming part of the API is for Rust callers only and
