Impressum utf_8.rs
Sprache: unbekannt
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// 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.
use super::*;
use crate::ascii::ascii_to_basic_latin;
use crate::ascii::basic_latin_to_ascii;
use crate::ascii::validate_ascii;
use crate::handles::*;
use crate::mem::convert_utf16_to_utf8_partial;
use crate::variant::*;
cfg_if! {
if #[cfg(feature = "simd-accel")] {
use ::core::intrinsics::unlikely;
use ::core::intrinsics::likely;
} else {
#[inline(always)]
fn unlikely(b: bool) -> bool {
b
}
#[inline(always)]
fn likely(b: bool) -> bool {
b
}
}
}
#[repr(align(64))] // Align to cache lines
pub struct Utf8Data {
pub table: [u8; 384],
}
// BEGIN GENERATED CODE. PLEASE DO NOT EDIT.
// Instead, please regenerate using generate-encoding-data.py
pub 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 GENERATED CODE
pub fn utf8_valid_up_to(src: &[u8]) -> usize {
let mut read = 0;
'outer: loop {
let mut byte = {
let src_remaining = &src[read..];
match validate_ascii(src_remaining) {
None => {
return src.len();
}
Some((non_ascii, consumed)) => {
read += consumed;
non_ascii
}
}
};
// Check for the longest sequence to avoid checking twice for the
// multi-byte sequences. This can't overflow with 64-bit address space,
// because full 64 bits aren't in use. In the 32-bit PAE case, for this
// to overflow would mean that the source slice would be so large that
// the address space of the process would not have space for any code.
// Therefore, the slice cannot be so long that this would overflow.
if likely(read + 4 <= src.len()) {
'inner: loop {
// At this point, `byte` is not included in `read`, because we
// don't yet know that a) the UTF-8 sequence is valid and b) that there
// is output space if it is an astral sequence.
// Inspecting the lead byte directly is faster than what the
// std lib does!
if likely(in_inclusive_range8(byte, 0xC2, 0xDF)) {
// Two-byte
let second = unsafe { *(src.get_unchecked(read + 1)) };
if !in_inclusive_range8(second, 0x80, 0xBF) {
break 'outer;
}
read += 2;
// Next lead (manually inlined)
if likely(read + 4 <= src.len()) {
byte = unsafe { *(src.get_unchecked(read)) };
if byte < 0x80 {
read += 1;
continue 'outer;
}
continue 'inner;
}
break 'inner;
}
if likely(byte < 0xF0) {
'three: loop {
// Three-byte
let second = unsafe { *(src.get_unchecked(read + 1)) };
let third = unsafe { *(src.get_unchecked(read + 2)) };
if ((UTF8_DATA.table[usize::from(second)]
& unsafe { *(UTF8_DATA.table.get_unchecked(byte as usize + 0x80)) })
| (third >> 6))
!= 2
{
break 'outer;
}
read += 3;
// Next lead (manually inlined)
if likely(read + 4 <= src.len()) {
byte = unsafe { *(src.get_unchecked(read)) };
if in_inclusive_range8(byte, 0xE0, 0xEF) {
continue 'three;
}
if likely(byte < 0x80) {
read += 1;
continue 'outer;
}
continue 'inner;
}
break 'inner;
}
}
// Four-byte
let second = unsafe { *(src.get_unchecked(read + 1)) };
let third = unsafe { *(src.get_unchecked(read + 2)) };
let fourth = unsafe { *(src.get_unchecked(read + 3)) };
if (u16::from(
UTF8_DATA.table[usize::from(second)]
& unsafe { *(UTF8_DATA.table.get_unchecked(byte as usize + 0x80)) },
) | u16::from(third >> 6)
| (u16::from(fourth & 0xC0) << 2))
!= 0x202
{
break 'outer;
}
read += 4;
// Next lead
if likely(read + 4 <= src.len()) {
byte = unsafe { *(src.get_unchecked(read)) };
if byte < 0x80 {
read += 1;
continue 'outer;
}
continue 'inner;
}
break 'inner;
}
}
// We can't have a complete 4-byte sequence, but we could still have
// one to three shorter sequences.
'tail: loop {
// >= is better for bound check elision than ==
if read >= src.len() {
break 'outer;
}
byte = src[read];
// At this point, `byte` is not included in `read`, because we
// don't yet know that a) the UTF-8 sequence is valid and b) that there
// is output space if it is an astral sequence.
// Inspecting the lead byte directly is faster than what the
// std lib does!
if byte < 0x80 {
read += 1;
continue 'tail;
}
if in_inclusive_range8(byte, 0xC2, 0xDF) {
// Two-byte
let new_read = read + 2;
if new_read > src.len() {
break 'outer;
}
let second = src[read + 1];
if !in_inclusive_range8(second, 0x80, 0xBF) {
break 'outer;
}
read += 2;
continue 'tail;
}
// We need to exclude valid four byte lead bytes, because
// `UTF8_DATA.second_mask` covers
if byte < 0xF0 {
// Three-byte
let new_read = read + 3;
if new_read > src.len() {
break 'outer;
}
let second = src[read + 1];
let third = src[read + 2];
if ((UTF8_DATA.table[usize::from(second)]
& unsafe { *(UTF8_DATA.table.get_unchecked(byte as usize + 0x80)) })
| (third >> 6))
!= 2
{
break 'outer;
}
read += 3;
// `'tail` handles sequences shorter than 4, so
// there can't be another sequence after this one.
break 'outer;
}
break 'outer;
}
}
read
}
#[cfg_attr(feature = "cargo-clippy", allow(never_loop, cyclomatic_complexity))]
pub fn convert_utf8_to_utf16_up_to_invalid(src: &[u8], dst: &mut [u16]) -> (usize, usize) {
let mut read = 0;
let mut written = 0;
'outer: loop {
let mut byte = {
let src_remaining = &src[read..];
let dst_remaining = &mut dst[written..];
let length = ::core::cmp::min(src_remaining.len(), dst_remaining.len());
match unsafe {
ascii_to_basic_latin(src_remaining.as_ptr(), dst_remaining.as_mut_ptr(), length)
} {
None => {
read += length;
written += length;
break 'outer;
}
Some((non_ascii, consumed)) => {
read += consumed;
written += consumed;
non_ascii
}
}
};
// Check for the longest sequence to avoid checking twice for the
// multi-byte sequences. This can't overflow with 64-bit address space,
// because full 64 bits aren't in use. In the 32-bit PAE case, for this
// to overflow would mean that the source slice would be so large that
// the address space of the process would not have space for any code.
// Therefore, the slice cannot be so long that this would overflow.
if likely(read + 4 <= src.len()) {
'inner: loop {
// At this point, `byte` is not included in `read`, because we
// don't yet know that a) the UTF-8 sequence is valid and b) that there
// is output space if it is an astral sequence.
// We know, thanks to `ascii_to_basic_latin` that there is output
// space for at least one UTF-16 code unit, so no need to check
// for output space in the BMP cases.
// Inspecting the lead byte directly is faster than what the
// std lib does!
if likely(in_inclusive_range8(byte, 0xC2, 0xDF)) {
// Two-byte
let second = unsafe { *(src.get_unchecked(read + 1)) };
if !in_inclusive_range8(second, 0x80, 0xBF) {
break 'outer;
}
unsafe {
*(dst.get_unchecked_mut(written)) =
((u16::from(byte) & 0x1F) << 6) | (u16::from(second) & 0x3F)
};
read += 2;
written += 1;
// Next lead (manually inlined)
if written == dst.len() {
break 'outer;
}
if likely(read + 4 <= src.len()) {
byte = unsafe { *(src.get_unchecked(read)) };
if byte < 0x80 {
unsafe { *(dst.get_unchecked_mut(written)) = u16::from(byte) };
read += 1;
written += 1;
continue 'outer;
}
continue 'inner;
}
break 'inner;
}
if likely(byte < 0xF0) {
'three: loop {
// Three-byte
let second = unsafe { *(src.get_unchecked(read + 1)) };
let third = unsafe { *(src.get_unchecked(read + 2)) };
if ((UTF8_DATA.table[usize::from(second)]
& unsafe { *(UTF8_DATA.table.get_unchecked(byte as usize + 0x80)) })
| (third >> 6))
!= 2
{
break 'outer;
}
let point = ((u16::from(byte) & 0xF) << 12)
| ((u16::from(second) & 0x3F) << 6)
| (u16::from(third) & 0x3F);
unsafe { *(dst.get_unchecked_mut(written)) = point };
read += 3;
written += 1;
// Next lead (manually inlined)
if written == dst.len() {
break 'outer;
}
if likely(read + 4 <= src.len()) {
byte = unsafe { *(src.get_unchecked(read)) };
if in_inclusive_range8(byte, 0xE0, 0xEF) {
continue 'three;
}
if likely(byte < 0x80) {
unsafe { *(dst.get_unchecked_mut(written)) = u16::from(byte) };
read += 1;
written += 1;
continue 'outer;
}
continue 'inner;
}
break 'inner;
}
}
// Four-byte
if written + 1 == dst.len() {
break 'outer;
}
let second = unsafe { *(src.get_unchecked(read + 1)) };
let third = unsafe { *(src.get_unchecked(read + 2)) };
let fourth = unsafe { *(src.get_unchecked(read + 3)) };
if (u16::from(
UTF8_DATA.table[usize::from(second)]
& unsafe { *(UTF8_DATA.table.get_unchecked(byte as usize + 0x80)) },
) | u16::from(third >> 6)
| (u16::from(fourth & 0xC0) << 2))
!= 0x202
{
break 'outer;
}
let point = ((u32::from(byte) & 0x7) << 18)
| ((u32::from(second) & 0x3F) << 12)
| ((u32::from(third) & 0x3F) << 6)
| (u32::from(fourth) & 0x3F);
unsafe { *(dst.get_unchecked_mut(written)) = (0xD7C0 + (point >> 10)) as u16 };
unsafe {
*(dst.get_unchecked_mut(written + 1)) = (0xDC00 + (point & 0x3FF)) as u16
};
read += 4;
written += 2;
// Next lead
if written == dst.len() {
break 'outer;
}
if likely(read + 4 <= src.len()) {
byte = unsafe { *(src.get_unchecked(read)) };
if byte < 0x80 {
unsafe { *(dst.get_unchecked_mut(written)) = u16::from(byte) };
read += 1;
written += 1;
continue 'outer;
}
continue 'inner;
}
break 'inner;
}
}
// We can't have a complete 4-byte sequence, but we could still have
// one to three shorter sequences.
'tail: loop {
// >= is better for bound check elision than ==
if read >= src.len() || written >= dst.len() {
break 'outer;
}
byte = src[read];
// At this point, `byte` is not included in `read`, because we
// don't yet know that a) the UTF-8 sequence is valid and b) that there
// is output space if it is an astral sequence.
// Inspecting the lead byte directly is faster than what the
// std lib does!
if byte < 0x80 {
dst[written] = u16::from(byte);
read += 1;
written += 1;
continue 'tail;
}
if in_inclusive_range8(byte, 0xC2, 0xDF) {
// Two-byte
let new_read = read + 2;
if new_read > src.len() {
break 'outer;
}
let second = src[read + 1];
if !in_inclusive_range8(second, 0x80, 0xBF) {
break 'outer;
}
dst[written] = ((u16::from(byte) & 0x1F) << 6) | (u16::from(second) & 0x3F);
read += 2;
written += 1;
continue 'tail;
}
// We need to exclude valid four byte lead bytes, because
// `UTF8_DATA.second_mask` covers
if byte < 0xF0 {
// Three-byte
let new_read = read + 3;
if new_read > src.len() {
break 'outer;
}
let second = src[read + 1];
let third = src[read + 2];
if ((UTF8_DATA.table[usize::from(second)]
& unsafe { *(UTF8_DATA.table.get_unchecked(byte as usize + 0x80)) })
| (third >> 6))
!= 2
{
break 'outer;
}
let point = ((u16::from(byte) & 0xF) << 12)
| ((u16::from(second) & 0x3F) << 6)
| (u16::from(third) & 0x3F);
dst[written] = point;
read += 3;
written += 1;
// `'tail` handles sequences shorter than 4, so
// there can't be another sequence after this one.
break 'outer;
}
break 'outer;
}
}
(read, written)
}
pub struct Utf8Decoder {
code_point: u32,
bytes_seen: usize, // 1, 2 or 3: counts continuations only
bytes_needed: usize, // 1, 2 or 3: counts continuations only
lower_boundary: u8,
upper_boundary: u8,
}
impl Utf8Decoder {
pub fn new_inner() -> Utf8Decoder {
Utf8Decoder {
code_point: 0,
bytes_seen: 0,
bytes_needed: 0,
lower_boundary: 0x80u8,
upper_boundary: 0xBFu8,
}
}
pub fn new() -> VariantDecoder {
VariantDecoder::Utf8(Utf8Decoder::new_inner())
}
pub fn in_neutral_state(&self) -> bool {
self.bytes_needed == 0
}
fn extra_from_state(&self) -> usize {
if self.bytes_needed == 0 {
0
} else {
self.bytes_seen + 1
}
}
pub fn max_utf16_buffer_length(&self, byte_length: usize) -> Option<usize> {
byte_length.checked_add(1 + self.extra_from_state())
}
pub fn max_utf8_buffer_length_without_replacement(&self, byte_length: usize) -> Option<us ize> {
byte_length.checked_add(3 + self.extra_from_state())
}
pub fn max_utf8_buffer_length(&self, byte_length: usize) -> Option<usize> {
checked_add(
3,
checked_mul(3, byte_length.checked_add(self.extra_from_state())),
)
}
decoder_functions!(
{},
{
// This is the fast path. The rest runs only at the
// start and end for partial sequences.
if self.bytes_needed == 0 {
dest.copy_utf8_up_to_invalid_from(&mut source);
}
},
{
if self.bytes_needed != 0 {
let bad_bytes = (self.bytes_seen + 1) as u8;
self.code_point = 0;
self.bytes_needed = 0;
self.bytes_seen = 0;
return (
DecoderResult::Malformed(bad_bytes, 0),
src_consumed,
dest.written(),
);
}
},
{
if self.bytes_needed == 0 {
if b < 0x80u8 {
destination_handle.write_ascii(b);
continue;
}
if b < 0xC2u8 {
return (
DecoderResult::Malformed(1, 0),
unread_handle.consumed(),
destination_handle.written(),
);
}
if b < 0xE0u8 {
self.bytes_needed = 1;
self.code_point = u32::from(b) & 0x1F;
continue;
}
if b < 0xF0u8 {
if b == 0xE0u8 {
self.lower_boundary = 0xA0u8;
} else if b == 0xEDu8 {
self.upper_boundary = 0x9Fu8;
}
self.bytes_needed = 2;
self.code_point = u32::from(b) & 0xF;
continue;
}
if b < 0xF5u8 {
if b == 0xF0u8 {
self.lower_boundary = 0x90u8;
} else if b == 0xF4u8 {
self.upper_boundary = 0x8Fu8;
}
self.bytes_needed = 3;
self.code_point = u32::from(b) & 0x7;
continue;
}
return (
DecoderResult::Malformed(1, 0),
unread_handle.consumed(),
destination_handle.written(),
);
}
// self.bytes_needed != 0
if !(b >= self.lower_boundary && b <= self.upper_boundary) {
let bad_bytes = (self.bytes_seen + 1) as u8;
self.code_point = 0;
self.bytes_needed = 0;
self.bytes_seen = 0;
self.lower_boundary = 0x80u8;
self.upper_boundary = 0xBFu8;
return (
DecoderResult::Malformed(bad_bytes, 0),
unread_handle.unread(),
destination_handle.written(),
);
}
self.lower_boundary = 0x80u8;
self.upper_boundary = 0xBFu8;
self.code_point = (self.code_point << 6) | (u32::from(b) & 0x3F);
self.bytes_seen += 1;
if self.bytes_seen != self.bytes_needed {
continue;
}
if self.bytes_needed == 3 {
destination_handle.write_astral(self.code_point);
} else {
destination_handle.write_bmp_excl_ascii(self.code_point as u16);
}
self.code_point = 0;
self.bytes_needed = 0;
self.bytes_seen = 0;
continue;
},
self,
src_consumed,
dest,
source,
b,
destination_handle,
unread_handle,
check_space_astral
);
}
#[cfg_attr(feature = "cargo-clippy", allow(never_loop))]
#[inline(never)]
pub fn convert_utf16_to_utf8_partial_inner(src: &[u16], dst: &mut [u8]) -> (usize, usize) {
let mut read = 0;
let mut written = 0;
'outer: loop {
let mut unit = {
let src_remaining = &src[read..];
let dst_remaining = &mut dst[written..];
let length = if dst_remaining.len() < src_remaining.len() {
dst_remaining.len()
} else {
src_remaining.len()
};
match unsafe {
basic_latin_to_ascii(src_remaining.as_ptr(), dst_remaining.as_mut_ptr(), length)
} {
None => {
read += length;
written += length;
return (read, written);
}
Some((non_ascii, consumed)) => {
read += consumed;
written += consumed;
non_ascii
}
}
};
'inner: loop {
// The following loop is only broken out of as a goto forward.
loop {
// Unfortunately, this check isn't enough for the compiler to elide
// the bound checks on writes to dst, which is why they are manually
// elided, which makes a measurable difference.
if written.checked_add(4).unwrap() > dst.len() {
return (read, written);
}
read += 1;
if unit < 0x800 {
unsafe {
*(dst.get_unchecked_mut(written)) = (unit >> 6) as u8 | 0xC0u8;
written += 1;
*(dst.get_unchecked_mut(written)) = (unit & 0x3F) as u8 | 0x80u8;
written += 1;
}
break;
}
let unit_minus_surrogate_start = unit.wrapping_sub(0xD800);
if likely(unit_minus_surrogate_start > (0xDFFF - 0xD800)) {
unsafe {
*(dst.get_unchecked_mut(written)) = (unit >> 12) as u8 | 0xE0u8;
written += 1;
*(dst.get_unchecked_mut(written)) = ((unit & 0xFC0) >> 6) as u8 | 0x80u8;
written += 1;
*(dst.get_unchecked_mut(written)) = (unit & 0x3F) as u8 | 0x80u8;
written += 1;
}
break;
}
if likely(unit_minus_surrogate_start <= (0xDBFF - 0xD800)) {
// high surrogate
// read > src.len() is impossible, but using
// >= instead of == allows the compiler to elide a bound check.
if read >= src.len() {
debug_assert_eq!(read, src.len());
// Unpaired surrogate at the end of the buffer.
unsafe {
*(dst.get_unchecked_mut(written)) = 0xEFu8;
written += 1;
*(dst.get_unchecked_mut(written)) = 0xBFu8;
written += 1;
*(dst.get_unchecked_mut(written)) = 0xBDu8;
written += 1;
}
return (read, written);
}
let second = src[read];
let second_minus_low_surrogate_start = second.wrapping_sub(0xDC00);
if likely(second_minus_low_surrogate_start <= (0xDFFF - 0xDC00)) {
// The next code unit is a low surrogate. Advance position.
read += 1;
let astral = (u32::from(unit) << 10) + u32::from(second)
- (((0xD800u32 << 10) - 0x10000u32) + 0xDC00u32);
unsafe {
*(dst.get_unchecked_mut(written)) = (astral >> 18) as u8 | 0xF0u8;
written += 1;
*(dst.get_unchecked_mut(written)) =
((astral & 0x3F000u32) >> 12) as u8 | 0x80u8;
written += 1;
*(dst.get_unchecked_mut(written)) =
((astral & 0xFC0u32) >> 6) as u8 | 0x80u8;
written += 1;
*(dst.get_unchecked_mut(written)) = (astral & 0x3F) as u8 | 0x80u8;
written += 1;
}
break;
}
// The next code unit is not a low surrogate. Don't advance
// position and treat the high surrogate as unpaired.
// Fall through
}
// Unpaired low surrogate
unsafe {
*(dst.get_unchecked_mut(written)) = 0xEFu8;
written += 1;
*(dst.get_unchecked_mut(written)) = 0xBFu8;
written += 1;
*(dst.get_unchecked_mut(written)) = 0xBDu8;
written += 1;
}
break;
}
// Now see if the next unit is Basic Latin
// read > src.len() is impossible, but using
// >= instead of == allows the compiler to elide a bound check.
if read >= src.len() {
debug_assert_eq!(read, src.len());
return (read, written);
}
unit = src[read];
if unlikely(unit < 0x80) {
// written > dst.len() is impossible, but using
// >= instead of == allows the compiler to elide a bound check.
if written >= dst.len() {
debug_assert_eq!(written, dst.len());
return (read, written);
}
dst[written] = unit as u8;
read += 1;
written += 1;
// Mysteriously, adding a punctuation check here makes
// the expected benificiary cases *slower*!
continue 'outer;
}
continue 'inner;
}
}
}
#[inline(never)]
pub fn convert_utf16_to_utf8_partial_tail(src: &[u16], dst: &mut [u8]) -> (usize, usize) {
// Everything below is cold code!
let mut read = 0;
let mut written = 0;
let mut unit = src[read];
// We now have up to 3 output slots, so an astral character
// will not fit.
if unit < 0x800 {
loop {
if unit < 0x80 {
if written >= dst.len() {
return (read, written);
}
read += 1;
dst[written] = unit as u8;
written += 1;
} else if unit < 0x800 {
if written + 2 > dst.len() {
return (read, written);
}
read += 1;
dst[written] = (unit >> 6) as u8 | 0xC0u8;
written += 1;
dst[written] = (unit & 0x3F) as u8 | 0x80u8;
written += 1;
} else {
return (read, written);
}
// read > src.len() is impossible, but using
// >= instead of == allows the compiler to elide a bound check.
if read >= src.len() {
debug_assert_eq!(read, src.len());
return (read, written);
}
unit = src[read];
}
}
// Could be an unpaired surrogate, but we'll need 3 output
// slots in any case.
if written + 3 > dst.len() {
return (read, written);
}
read += 1;
let unit_minus_surrogate_start = unit.wrapping_sub(0xD800);
if unit_minus_surrogate_start <= (0xDFFF - 0xD800) {
// Got surrogate
if unit_minus_surrogate_start <= (0xDBFF - 0xD800) {
// Got high surrogate
if read >= src.len() {
// Unpaired high surrogate
unit = 0xFFFD;
} else {
let second = src[read];
if in_inclusive_range16(second, 0xDC00, 0xDFFF) {
// Valid surrogate pair, but we know it won't fit.
read -= 1;
return (read, written);
}
// Unpaired high
unit = 0xFFFD;
}
} else {
// Unpaired low
unit = 0xFFFD;
}
}
dst[written] = (unit >> 12) as u8 | 0xE0u8;
written += 1;
dst[written] = ((unit & 0xFC0) >> 6) as u8 | 0x80u8;
written += 1;
dst[written] = (unit & 0x3F) as u8 | 0x80u8;
written += 1;
debug_assert_eq!(written, dst.len());
(read, written)
}
pub struct Utf8Encoder;
impl Utf8Encoder {
pub fn new(encoding: &'static Encoding) -> Encoder {
Encoder::new(encoding, VariantEncoder::Utf8(Utf8Encoder))
}
pub fn max_buffer_length_from_utf16_without_replacement(
&self,
u16_length: usize,
) -> Option<usize> {
u16_length.checked_mul(3)
}
pub fn max_buffer_length_from_utf8_without_replacement(
&self,
byte_length: usize,
) -> Option<usize> {
Some(byte_length)
}
pub fn encode_from_utf16_raw(
&mut self,
src: &[u16],
dst: &mut [u8],
_last: bool,
) -> (EncoderResult, usize, usize) {
let (read, written) = convert_utf16_to_utf8_partial(src, dst);
(
if read == src.len() {
EncoderResult::InputEmpty
} else {
EncoderResult::OutputFull
},
read,
written,
)
}
pub fn encode_from_utf8_raw(
&mut self,
src: &str,
dst: &mut [u8],
_last: bool,
) -> (EncoderResult, usize, usize) {
let bytes = src.as_bytes();
let mut to_write = bytes.len();
if to_write <= dst.len() {
(&mut dst[..to_write]).copy_from_slice(bytes);
return (EncoderResult::InputEmpty, to_write, to_write);
}
to_write = dst.len();
// Move back until we find a UTF-8 sequence boundary.
while (bytes[to_write] & 0xC0) == 0x80 {
to_write -= 1;
}
(&mut dst[..to_write]).copy_from_slice(&bytes[..to_write]);
(EncoderResult::OutputFull, to_write, to_write)
}
}
// Any copyright to the test code below this comment is dedicated to the
// Public Domain. http://creativecommons.org/publicdomain/zero/1.0/
#[cfg(all(test, feature = "alloc"))]
mod tests {
use super::super::testing::*;
use super::super::*;
// fn decode_utf8_to_utf16(bytes: &[u8], expect: &[u16]) {
// decode_to_utf16_without_replacement(UTF_8, bytes, expect);
// }
fn decode_utf8_to_utf8(bytes: &[u8], expect: &str) {
decode_to_utf8(UTF_8, bytes, expect);
}
fn decode_valid_utf8(string: &str) {
decode_utf8_to_utf8(string.as_bytes(), string);
}
fn encode_utf8_from_utf16(string: &[u16], expect: &[u8]) {
encode_from_utf16(UTF_8, string, expect);
}
fn encode_utf8_from_utf8(string: &str, expect: &[u8]) {
encode_from_utf8(UTF_8, string, expect);
}
fn encode_utf8_from_utf16_with_output_limit(
string: &[u16],
expect: &str,
limit: usize,
expect_result: EncoderResult,
) {
let mut dst = Vec::new();
{
dst.resize(limit, 0u8);
let mut encoder = UTF_8.new_encoder();
let (result, read, written) =
encoder.encode_from_utf16_without_replacement(string, &mut dst, false);
assert_eq!(result, expect_result);
if expect_result == EncoderResult::InputEmpty {
assert_eq!(read, string.len());
}
assert_eq!(&dst[..written], expect.as_bytes());
}
{
dst.resize(64, 0u8);
for (i, elem) in dst.iter_mut().enumerate() {
*elem = i as u8;
}
let mut encoder = UTF_8.new_encoder();
let (_, _, mut j) =
encoder.encode_from_utf16_without_replacement(string, &mut dst, false);
while j < dst.len() {
assert_eq!(usize::from(dst[j]), j);
j += 1;
}
}
}
#[test]
fn test_utf8_decode() {
// Empty
decode_valid_utf8("");
// ASCII
decode_valid_utf8("ab");
// Low BMP
decode_valid_utf8("a\u{E4}Z");
// High BMP
decode_valid_utf8("a\u{2603}Z");
// Astral
decode_valid_utf8("a\u{1F4A9}Z");
// Low BMP with last byte missing
decode_utf8_to_utf8(b"a\xC3Z", "a\u{FFFD}Z");
decode_utf8_to_utf8(b"a\xC3", "a\u{FFFD}");
// High BMP with last byte missing
decode_utf8_to_utf8(b"a\xE2\x98Z", "a\u{FFFD}Z");
decode_utf8_to_utf8(b"a\xE2\x98", "a\u{FFFD}");
// Astral with last byte missing
decode_utf8_to_utf8(b"a\xF0\x9F\x92Z", "a\u{FFFD}Z");
decode_utf8_to_utf8(b"a\xF0\x9F\x92", "a\u{FFFD}");
// Lone highest continuation
decode_utf8_to_utf8(b"a\xBFZ", "a\u{FFFD}Z");
decode_utf8_to_utf8(b"a\xBF", "a\u{FFFD}");
// Two lone highest continuations
decode_utf8_to_utf8(b"a\xBF\xBFZ", "a\u{FFFD}\u{FFFD}Z");
decode_utf8_to_utf8(b"a\xBF\xBF", "a\u{FFFD}\u{FFFD}");
// Low BMP followed by lowest lone continuation
decode_utf8_to_utf8(b"a\xC3\xA4\x80Z", "a\u{E4}\u{FFFD}Z");
decode_utf8_to_utf8(b"a\xC3\xA4\x80", "a\u{E4}\u{FFFD}");
// Low BMP followed by highest lone continuation
decode_utf8_to_utf8(b"a\xC3\xA4\xBFZ", "a\u{E4}\u{FFFD}Z");
decode_utf8_to_utf8(b"a\xC3\xA4\xBF", "a\u{E4}\u{FFFD}");
// High BMP followed by lowest lone continuation
decode_utf8_to_utf8(b"a\xE2\x98\x83\x80Z", "a\u{2603}\u{FFFD}Z");
decode_utf8_to_utf8(b"a\xE2\x98\x83\x80", "a\u{2603}\u{FFFD}");
// High BMP followed by highest lone continuation
decode_utf8_to_utf8(b"a\xE2\x98\x83\xBFZ", "a\u{2603}\u{FFFD}Z");
decode_utf8_to_utf8(b"a\xE2\x98\x83\xBF", "a\u{2603}\u{FFFD}");
// Astral followed by lowest lone continuation
decode_utf8_to_utf8(b"a\xF0\x9F\x92\xA9\x80Z", "a\u{1F4A9}\u{FFFD}Z");
decode_utf8_to_utf8(b"a\xF0\x9F\x92\xA9\x80", "a\u{1F4A9}\u{FFFD}");
// Astral followed by highest lone continuation
decode_utf8_to_utf8(b"a\xF0\x9F\x92\xA9\xBFZ", "a\u{1F4A9}\u{FFFD}Z");
decode_utf8_to_utf8(b"a\xF0\x9F\x92\xA9\xBF", "a\u{1F4A9}\u{FFFD}");
// Boundary conditions
// Lowest single-byte
decode_valid_utf8("Z\x00");
decode_valid_utf8("Z\x00Z");
// Lowest single-byte as two-byte overlong sequence
decode_utf8_to_utf8(b"a\xC0\x80", "a\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xC0\x80Z", "a\u{FFFD}\u{FFFD}Z");
// Lowest single-byte as three-byte overlong sequence
decode_utf8_to_utf8(b"a\xE0\x80\x80", "a\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xE0\x80\x80Z", "a\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Lowest single-byte as four-byte overlong sequence
decode_utf8_to_utf8(b"a\xF0\x80\x80\x80", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xF0\x80\x80\x80Z", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}Z");
// One below lowest single-byte
decode_utf8_to_utf8(b"a\xFF", "a\u{FFFD}");
decode_utf8_to_utf8(b"a\xFFZ", "a\u{FFFD}Z");
// Highest single-byte
decode_valid_utf8("a\x7F");
decode_valid_utf8("a\x7FZ");
// Highest single-byte as two-byte overlong sequence
decode_utf8_to_utf8(b"a\xC1\xBF", "a\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xC1\xBFZ", "a\u{FFFD}\u{FFFD}Z");
// Highest single-byte as three-byte overlong sequence
decode_utf8_to_utf8(b"a\xE0\x81\xBF", "a\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xE0\x81\xBFZ", "a\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Highest single-byte as four-byte overlong sequence
decode_utf8_to_utf8(b"a\xF0\x80\x81\xBF", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xF0\x80\x81\xBFZ", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}Z");
// One past highest single byte (also lone continuation)
decode_utf8_to_utf8(b"a\x80Z", "a\u{FFFD}Z");
decode_utf8_to_utf8(b"a\x80", "a\u{FFFD}");
// Two lone continuations
decode_utf8_to_utf8(b"a\x80\x80Z", "a\u{FFFD}\u{FFFD}Z");
decode_utf8_to_utf8(b"a\x80\x80", "a\u{FFFD}\u{FFFD}");
// Three lone continuations
decode_utf8_to_utf8(b"a\x80\x80\x80Z", "a\u{FFFD}\u{FFFD}\u{FFFD}Z");
decode_utf8_to_utf8(b"a\x80\x80\x80", "a\u{FFFD}\u{FFFD}\u{FFFD}");
// Four lone continuations
decode_utf8_to_utf8(b"a\x80\x80\x80\x80Z", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}Z");
decode_utf8_to_utf8(b"a\x80\x80\x80\x80", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}");
// Lowest two-byte
decode_utf8_to_utf8(b"a\xC2\x80", "a\u{0080}");
decode_utf8_to_utf8(b"a\xC2\x80Z", "a\u{0080}Z");
// Lowest two-byte as three-byte overlong sequence
decode_utf8_to_utf8(b"a\xE0\x82\x80", "a\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xE0\x82\x80Z", "a\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Lowest two-byte as four-byte overlong sequence
decode_utf8_to_utf8(b"a\xF0\x80\x82\x80", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xF0\x80\x82\x80Z", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Lead one below lowest two-byte
decode_utf8_to_utf8(b"a\xC1\x80", "a\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xC1\x80Z", "a\u{FFFD}\u{FFFD}Z");
// Trail one below lowest two-byte
decode_utf8_to_utf8(b"a\xC2\x7F", "a\u{FFFD}\u{007F}");
decode_utf8_to_utf8(b"a\xC2\x7FZ", "a\u{FFFD}\u{007F}Z");
// Highest two-byte
decode_utf8_to_utf8(b"a\xDF\xBF", "a\u{07FF}");
decode_utf8_to_utf8(b"a\xDF\xBFZ", "a\u{07FF}Z");
// Highest two-byte as three-byte overlong sequence
decode_utf8_to_utf8(b"a\xE0\x9F\xBF", "a\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xE0\x9F\xBFZ", "a\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Highest two-byte as four-byte overlong sequence
decode_utf8_to_utf8(b"a\xF0\x80\x9F\xBF", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xF0\x80\x9F\xBFZ", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Lowest three-byte
decode_utf8_to_utf8(b"a\xE0\xA0\x80", "a\u{0800}");
decode_utf8_to_utf8(b"a\xE0\xA0\x80Z", "a\u{0800}Z");
// Lowest three-byte as four-byte overlong sequence
decode_utf8_to_utf8(b"a\xF0\x80\xA0\x80", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xF0\x80\xA0\x80Z", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Highest below surrogates
decode_utf8_to_utf8(b"a\xED\x9F\xBF", "a\u{D7FF}");
decode_utf8_to_utf8(b"a\xED\x9F\xBFZ", "a\u{D7FF}Z");
// Highest below surrogates as four-byte overlong sequence
decode_utf8_to_utf8(b"a\xF0\x8D\x9F\xBF", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xF0\x8D\x9F\xBFZ", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}Z");
// First surrogate
decode_utf8_to_utf8(b"a\xED\xA0\x80", "a\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xED\xA0\x80Z", "a\u{FFFD}\u{FFFD}\u{FFFD}Z");
// First surrogate as four-byte overlong sequence
decode_utf8_to_utf8(b"a\xF0\x8D\xA0\x80", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xF0\x8D\xA0\x80Z", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Last surrogate
decode_utf8_to_utf8(b"a\xED\xBF\xBF", "a\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xED\xBF\xBFZ", "a\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Last surrogate as four-byte overlong sequence
decode_utf8_to_utf8(b"a\xF0\x8D\xBF\xBF", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xF0\x8D\xBF\xBFZ", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Lowest above surrogates
decode_utf8_to_utf8(b"a\xEE\x80\x80", "a\u{E000}");
decode_utf8_to_utf8(b"a\xEE\x80\x80Z", "a\u{E000}Z");
// Lowest above surrogates as four-byte overlong sequence
decode_utf8_to_utf8(b"a\xF0\x8E\x80\x80", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xF0\x8E\x80\x80Z", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Highest three-byte
decode_utf8_to_utf8(b"a\xEF\xBF\xBF", "a\u{FFFF}");
decode_utf8_to_utf8(b"a\xEF\xBF\xBFZ", "a\u{FFFF}Z");
// Highest three-byte as four-byte overlong sequence
decode_utf8_to_utf8(b"a\xF0\x8F\xBF\xBF", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xF0\x8F\xBF\xBFZ", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Lowest four-byte
decode_utf8_to_utf8(b"a\xF0\x90\x80\x80", "a\u{10000}");
decode_utf8_to_utf8(b"a\xF0\x90\x80\x80Z", "a\u{10000}Z");
// Highest four-byte
decode_utf8_to_utf8(b"a\xF4\x8F\xBF\xBF", "a\u{10FFFF}");
decode_utf8_to_utf8(b"a\xF4\x8F\xBF\xBFZ", "a\u{10FFFF}Z");
// One past highest four-byte
decode_utf8_to_utf8(b"a\xF4\x90\x80\x80", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xF4\x90\x80\x80Z", "a\u{FFFD}\u{FFFD}\u{FFFD}\u{FFFD}Z");
// Highest four-byte with last byte replaced with 0xFF
decode_utf8_to_utf8(b"a\xF4\x8F\xBF\xFF", "a\u{FFFD}\u{FFFD}");
decode_utf8_to_utf8(b"a\xF4\x8F\xBF\xFFZ", "a\u{FFFD}\u{FFFD}Z");
}
#[test]
fn test_utf8_encode() {
// Empty
encode_utf8_from_utf16(&[], b"");
encode_utf8_from_utf8("", b"");
encode_utf8_from_utf16(&[0x0000], "\u{0000}".as_bytes());
encode_utf8_from_utf16(&[0x007F], "\u{007F}".as_bytes());
encode_utf8_from_utf16(&[0x0080], "\u{0080}".as_bytes());
encode_utf8_from_utf16(&[0x07FF], "\u{07FF}".as_bytes());
encode_utf8_from_utf16(&[0x0800], "\u{0800}".as_bytes());
encode_utf8_from_utf16(&[0xD7FF], "\u{D7FF}".as_bytes());
encode_utf8_from_utf16(&[0xD800], "\u{FFFD}".as_bytes());
encode_utf8_from_utf16(&[0xD800, 0x0062], "\u{FFFD}\u{0062}".as_bytes());
encode_utf8_from_utf16(&[0xDFFF], "\u{FFFD}".as_bytes());
encode_utf8_from_utf16(&[0xDFFF, 0x0062], "\u{FFFD}\u{0062}".as_bytes());
encode_utf8_from_utf16(&[0xE000], "\u{E000}".as_bytes());
encode_utf8_from_utf16(&[0xFFFF], "\u{FFFF}".as_bytes());
encode_utf8_from_utf16(&[0xD800, 0xDC00], "\u{10000}".as_bytes());
encode_utf8_from_utf16(&[0xDBFF, 0xDFFF], "\u{10FFFF}".as_bytes());
encode_utf8_from_utf16(&[0xDC00, 0xDEDE], "\u{FFFD}\u{FFFD}".as_bytes());
}
#[test]
fn test_encode_utf8_from_utf16_with_output_limit() {
encode_utf8_from_utf16_with_output_limit(&[0x0062], "\u{62}", 1, EncoderResult::InputEmpty);
encode_utf8_from_utf16_with_output_limit(&[0x00A7], "\u{A7}", 2, EncoderResult::InputEmpty);
encode_utf8_from_utf16_with_output_limit(
&[0x2603],
"\u{2603}",
3,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0xD83D, 0xDCA9],
"\u{1F4A9}",
4,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(&[0x00A7], "", 1, EncoderResult::OutputFull);
encode_utf8_from_utf16_with_output_limit(&[0x2603], "", 2, EncoderResult::OutputFull);
encode_utf8_from_utf16_with_output_limit(
&[0xD83D, 0xDCA9],
"",
3,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x0062],
"\u{63}\u{62}",
2,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00A7],
"\u{63}\u{A7}",
3,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x2603],
"\u{63}\u{2603}",
4,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0xD83D, 0xDCA9],
"\u{63}\u{1F4A9}",
5,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00A7],
"\u{63}",
2,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x2603],
"\u{63}",
3,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0xD83D, 0xDCA9],
"\u{63}",
4,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x00B6, 0x0062],
"\u{B6}\u{62}",
3,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x00B6, 0x00A7],
"\u{B6}\u{A7}",
4,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x00B6, 0x2603],
"\u{B6}\u{2603}",
5,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x00B6, 0xD83D, 0xDCA9],
"\u{B6}\u{1F4A9}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x00B6, 0x00A7],
"\u{B6}",
3,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x00B6, 0x2603],
"\u{B6}",
4,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x00B6, 0xD83D, 0xDCA9],
"\u{B6}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x0062],
"\u{263A}\u{62}",
4,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x00A7],
"\u{263A}\u{A7}",
5,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x2603],
"\u{263A}\u{2603}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0xD83D, 0xDCA9],
"\u{263A}\u{1F4A9}",
7,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x00A7],
"\u{263A}",
4,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x2603],
"\u{263A}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0xD83D, 0xDCA9],
"\u{263A}",
6,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0xD83D, 0xDE0E, 0x0062],
"\u{1F60E}\u{62}",
5,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0xD83D, 0xDE0E, 0x00A7],
"\u{1F60E}\u{A7}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0xD83D, 0xDE0E, 0x2603],
"\u{1F60E}\u{2603}",
7,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0xD83D, 0xDE0E, 0xD83D, 0xDCA9],
"\u{1F60E}\u{1F4A9}",
8,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0xD83D, 0xDE0E, 0x00A7],
"\u{1F60E}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0xD83D, 0xDE0E, 0x2603],
"\u{1F60E}",
6,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0xD83D, 0xDE0E, 0xD83D, 0xDCA9],
"\u{1F60E}",
7,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0x0062, 0x0062],
"\u{63}\u{B6}\u{62}\u{62}",
5,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0x0062, 0x0062],
"\u{63}\u{B6}\u{62}",
4,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0x0062, 0x0062, 0x0062],
"\u{63}\u{B6}\u{62}\u{62}\u{62}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0x0062, 0x0062, 0x0062],
"\u{63}\u{B6}\u{62}\u{62}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x0062, 0x0062],
"\u{263A}\u{62}\u{62}",
5,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x0062, 0x0062],
"\u{263A}\u{62}",
4,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x0062, 0x0062, 0x0062],
"\u{263A}\u{62}\u{62}\u{62}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x0062, 0x0062, 0x0062],
"\u{263A}\u{62}\u{62}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0x00A7],
"\u{63}\u{B6}\u{A7}",
5,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0x00A7],
"\u{63}\u{B6}",
4,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0x00A7, 0x0062],
"\u{63}\u{B6}\u{A7}\u{62}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0x00A7, 0x0062],
"\u{63}\u{B6}\u{A7}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x00A7, 0x0062],
"\u{263A}\u{A7}\u{62}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x00A7, 0x0062],
"\u{263A}\u{A7}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0x0062, 0x00A7],
"\u{63}\u{B6}\u{62}\u{A7}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0x0062, 0x00A7],
"\u{63}\u{B6}\u{62}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x0062, 0x00A7],
"\u{263A}\u{62}\u{A7}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x0062, 0x00A7],
"\u{263A}\u{62}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0x2603],
"\u{63}\u{B6}\u{2603}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0x2603],
"\u{63}\u{B6}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x2603],
"\u{263A}\u{2603}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0x2603],
"\u{263A}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0xD83D],
"\u{63}\u{B6}\u{FFFD}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0xD83D],
"\u{63}\u{B6}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0xD83D],
"\u{263A}\u{FFFD}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0xD83D],
"\u{263A}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0xDCA9],
"\u{63}\u{B6}\u{FFFD}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x0063, 0x00B6, 0xDCA9],
"\u{63}\u{B6}",
5,
EncoderResult::OutputFull,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0xDCA9],
"\u{263A}\u{FFFD}",
6,
EncoderResult::InputEmpty,
);
encode_utf8_from_utf16_with_output_limit(
&[0x263A, 0xDCA9],
"\u{263A}",
5,
EncoderResult::OutputFull,
);
}
#[test]
fn test_utf8_max_length_from_utf16() {
let mut encoder = UTF_8.new_encoder();
let mut output = [0u8; 13];
let input = &[0x2C9Fu16, 0x2CA9u16, 0x2CA3u16, 0x2C9Fu16];
let needed = encoder
.max_buffer_length_from_utf16_without_replacement(input.len())
.unwrap();
let (result, _, _) =
encoder.encode_from_utf16_without_replacement(input, &mut output[..needed], true);
assert_eq!(result, EncoderResult::InputEmpty);
}
#[test]
fn test_decode_bom_prefixed_split_byte_triple() {
let mut output = [0u16; 20];
let mut decoder = UTF_8.new_decoder();
{
let needed = decoder.max_utf16_buffer_length(1).unwrap();
let (result, read, written, had_errors) =
decoder.decode_to_utf16(b"\xEF", &mut output[..needed], false);
assert_eq!(result, CoderResult::InputEmpty);
assert_eq!(read, 1);
assert_eq!(written, 0);
assert!(!had_errors);
}
{
let needed = decoder.max_utf16_buffer_length(1).unwrap();
let (result, read, written, had_errors) =
decoder.decode_to_utf16(b"\xBF", &mut output[..needed], false);
assert_eq!(result, CoderResult::InputEmpty);
assert_eq!(read, 1);
assert_eq!(written, 0);
assert!(!had_errors);
}
{
let needed = decoder.max_utf16_buffer_length(1).unwrap();
let (result, read, written, had_errors) =
decoder.decode_to_utf16(b"\xBE", &mut output[..needed], true);
assert_eq!(result, CoderResult::InputEmpty);
assert_eq!(read, 1);
assert_eq!(written, 1);
assert!(!had_errors);
assert_eq!(output[0], 0xFFFE);
}
}
#[test]
fn test_decode_bom_prefixed_split_byte_pair() {
let mut output = [0u16; 20];
let mut decoder = UTF_8.new_decoder();
{
let needed = decoder.max_utf16_buffer_length(1).unwrap();
let (result, read, written, had_errors) =
decoder.decode_to_utf16(b"\xEF", &mut output[..needed], false);
assert_eq!(result, CoderResult::InputEmpty);
assert_eq!(read, 1);
assert_eq!(written, 0);
assert!(!had_errors);
}
{
let needed = decoder.max_utf16_buffer_length(1).unwrap();
let (result, read, written, had_errors) =
decoder.decode_to_utf16(b"\xBC", &mut output[..needed], true);
assert_eq!(result, CoderResult::InputEmpty);
assert_eq!(read, 1);
assert_eq!(written, 1);
assert!(had_errors);
assert_eq!(output[0], 0xFFFD);
}
}
#[test]
fn test_decode_bom_prefix() {
let mut output = [0u16; 20];
let mut decoder = UTF_8.new_decoder();
{
let needed = decoder.max_utf16_buffer_length(1).unwrap();
let (result, read, written, had_errors) =
decoder.decode_to_utf16(b"\xEF", &mut output[..needed], true);
assert_eq!(result, CoderResult::InputEmpty);
assert_eq!(read, 1);
assert_eq!(written, 1);
assert!(had_errors);
assert_eq!(output[0], 0xFFFD);
}
}
#[test]
fn test_tail() {
let mut output = [0u16; 1];
let mut decoder = UTF_8.new_decoder_without_bom_handling();
{
let (result, read, written, had_errors) =
decoder.decode_to_utf16("\u{E4}a".as_bytes(), &mut output[..], false);
assert_eq!(result, CoderResult::OutputFull);
assert_eq!(read, 2);
assert_eq!(written, 1);
assert!(!had_errors);
assert_eq!(output[0], 0x00E4);
}
}
}
[ Seitenstruktur0.93Drucken
etwas mehr zur Ethik
]
|
2026-04-02
|
