Source code
Revision control
Copy as Markdown
Other Tools
// 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
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use super::*;
use crate::data::*;
use crate::handles::*;
use crate::variant::*;
// Rust 1.14.0 requires the following despite the asterisk above.
use super::in_inclusive_range16;
use super::in_range16;
pub struct EucKrDecoder {
lead: Option<u8>,
}
impl EucKrDecoder {
pub fn new() -> VariantDecoder {
VariantDecoder::EucKr(EucKrDecoder { lead: None })
}
pub fn in_neutral_state(&self) -> bool {
self.lead.is_none()
}
fn plus_one_if_lead(&self, byte_length: usize) -> Option<usize> {
byte_length.checked_add(match self.lead {
None => 0,
Some(_) => 1,
})
}
pub fn max_utf16_buffer_length(&self, byte_length: usize) -> Option<usize> {
self.plus_one_if_lead(byte_length)
}
pub fn max_utf8_buffer_length_without_replacement(&self, byte_length: usize) -> Option<usize> {
// worst case: 2 to 3
let len = self.plus_one_if_lead(byte_length);
checked_add(2, checked_add_opt(len, checked_div(checked_add(1, len), 2)))
}
pub fn max_utf8_buffer_length(&self, byte_length: usize) -> Option<usize> {
checked_mul(3, self.plus_one_if_lead(byte_length))
}
ascii_compatible_two_byte_decoder_functions!(
{
// If lead is between 0x81 and 0xFE, inclusive,
// subtract offset 0x81.
let non_ascii_minus_offset =
non_ascii.wrapping_sub(0x81);
if non_ascii_minus_offset > (0xFE - 0x81) {
return (DecoderResult::Malformed(1, 0),
source.consumed(),
handle.written());
}
non_ascii_minus_offset
},
{
if lead_minus_offset >= 0x20 {
// Not the extension range above KS X 1001
let trail_minus_offset =
byte.wrapping_sub(0xA1);
if trail_minus_offset <= (0xFE - 0xA1) {
// KS X 1001
let ksx_pointer = mul_94(lead_minus_offset - 0x20) + trail_minus_offset as usize;
let hangul_pointer = ksx_pointer.wrapping_sub((0x2F - 0x20) * 94);
if hangul_pointer < KSX1001_HANGUL.len() {
let upper_bmp = KSX1001_HANGUL[hangul_pointer];
handle.write_upper_bmp(upper_bmp)
} else if ksx_pointer < KSX1001_SYMBOLS.len() {
let bmp = KSX1001_SYMBOLS[ksx_pointer];
handle.write_bmp_excl_ascii(bmp)
} else {
let hanja_pointer = ksx_pointer.wrapping_sub((0x49 - 0x20) * 94);
if hanja_pointer < KSX1001_HANJA.len() {
let upper_bmp = KSX1001_HANJA[hanja_pointer];
handle.write_upper_bmp(upper_bmp)
} else if (lead_minus_offset == 0x27) && ((trail_minus_offset as usize) < KSX1001_UPPERCASE.len()) {
let mid_bmp = KSX1001_UPPERCASE[trail_minus_offset as usize];
if mid_bmp == 0 {
return (DecoderResult::Malformed(2, 0),
unread_handle_trail.consumed(),
handle.written());
}
handle.write_mid_bmp(mid_bmp)
} else if (lead_minus_offset == 0x28) && ((trail_minus_offset as usize) < KSX1001_LOWERCASE.len()) {
let mid_bmp = KSX1001_LOWERCASE[trail_minus_offset as usize];
handle.write_mid_bmp(mid_bmp)
} else if (lead_minus_offset == 0x25) && ((trail_minus_offset as usize) < KSX1001_BOX.len()) {
let upper_bmp = KSX1001_BOX[trail_minus_offset as usize];
handle.write_upper_bmp(upper_bmp)
} else {
let other_pointer = ksx_pointer.wrapping_sub(2 * 94);
if other_pointer < 0x039F {
let bmp = ksx1001_other_decode(other_pointer as u16);
// ASCII range means unassigned
if bmp < 0x80 {
return (DecoderResult::Malformed(2, 0),
unread_handle_trail.consumed(),
handle.written());
}
handle.write_bmp_excl_ascii(bmp)
} else {
return (DecoderResult::Malformed(2, 0),
unread_handle_trail.consumed(),
handle.written());
}
}
}
} else {
// Extension range to the left of
// KS X 1001
let left_lead = lead_minus_offset - 0x20;
let left_trail = if byte.wrapping_sub(0x40 + 0x41) < (0x60 - 0x40) {
byte - (12 + 0x41)
} else if byte.wrapping_sub(0x20 + 0x41) < (0x3A - 0x20) {
byte - (6 + 0x41)
} else if byte.wrapping_sub(0x41) < 0x1A {
byte - 0x41
} else {
if byte < 0x80 {
return (DecoderResult::Malformed(1, 0),
unread_handle_trail.unread(),
handle.written());
}
return (DecoderResult::Malformed(2, 0),
unread_handle_trail.consumed(),
handle.written());
};
let left_pointer = ((left_lead as usize) * (190 - 94 - 12)) + left_trail as usize;
if left_pointer < (0x45 - 0x20) * (190 - 94 - 12) + 0x12 {
let upper_bmp = cp949_left_hangul_decode(left_pointer as u16);
handle.write_upper_bmp(upper_bmp)
} else {
if byte < 0x80 {
return (DecoderResult::Malformed(1, 0),
unread_handle_trail.unread(),
handle.written());
}
return (DecoderResult::Malformed(2, 0),
unread_handle_trail.consumed(),
handle.written());
}
}
} else {
// Extension range above KS X 1001
let top_trail = if byte.wrapping_sub(0x40 + 0x41) < (0xBE - 0x40) {
byte - (12 + 0x41)
} else if byte.wrapping_sub(0x20 + 0x41) < (0x3A - 0x20) {
byte - (6 + 0x41)
} else if byte.wrapping_sub(0x41) < 0x1A {
byte - 0x41
} else {
if byte < 0x80 {
return (DecoderResult::Malformed(1, 0),
unread_handle_trail.unread(),
handle.written());
}
return (DecoderResult::Malformed(2, 0),
unread_handle_trail.consumed(),
handle.written());
};
let top_pointer = ((lead_minus_offset as usize) * (190 - 12)) + top_trail as usize;
let upper_bmp = cp949_top_hangul_decode(top_pointer as u16);
handle.write_upper_bmp(upper_bmp)
}
},
self,
non_ascii,
byte,
lead_minus_offset,
unread_handle_trail,
source,
handle,
'outermost,
copy_ascii_from_check_space_bmp,
check_space_bmp,
true);
}
fn ksx1001_encode_misc(bmp: u16) -> Option<(usize, usize)> {
if in_inclusive_range16(bmp, 0x3000, 0x3015) {
if let Some(pos) = position(&KSX1001_SYMBOLS[..(0xAB - 0x60)], bmp) {
return Some((0xA1, pos + 0xA1));
}
}
if let Some(other_pointer) = ksx1001_other_encode(bmp) {
let other_lead = ((other_pointer as usize) / 94) + (0x81 + 0x22);
let other_trail = ((other_pointer as usize) % 94) + 0xA1;
return Some((other_lead, other_trail));
}
if in_range16(bmp, 0x00AA, 0x0168) {
// Latin
if let Some(pos) = position(&KSX1001_LOWERCASE[..], bmp) {
return Some((0x81 + 0x28, 0xA1 + pos));
}
if let Some(pos) = position(&KSX1001_UPPERCASE[..], bmp) {
return Some((0x81 + 0x27, 0xA1 + pos));
}
} else if in_range16(bmp, 0x2500, 0x254C) {
if let Some(pos) = position(&KSX1001_BOX[..], bmp) {
return Some((0x81 + 0x25, 0xA1 + pos));
}
}
if in_inclusive_range16(bmp, 0x2015, 0x266D)
|| in_inclusive_range16(bmp, 0x321C, 0x33D8)
|| in_inclusive_range16(bmp, 0xFF3C, 0xFFE5)
|| in_inclusive_range16(bmp, 0x00A1, 0x00F7)
|| in_inclusive_range16(bmp, 0x02C7, 0x02DD)
{
if let Some(pos) = position(&KSX1001_SYMBOLS[3..], bmp) {
if pos < (94 - 3) {
return Some((0xA1, pos + 0xA1 + 3));
}
return Some((0xA2, pos - (94 - 3) + 0xA1));
}
}
None
}
#[cfg(not(feature = "fast-hangul-encode"))]
#[inline(always)]
fn ksx1001_encode_hangul(bmp: u16, _: u16) -> (u8, u8) {
match KSX1001_HANGUL.binary_search(&bmp) {
Ok(ksx_hangul_pointer) => {
let ksx_hangul_lead = (ksx_hangul_pointer / 94) + (0x81 + 0x2F);
let ksx_hangul_trail = (ksx_hangul_pointer % 94) + 0xA1;
(ksx_hangul_lead as u8, ksx_hangul_trail as u8)
}
Err(_) => {
let (lead, cp949_trail) = if bmp < 0xC8A5 {
// Above KS X 1001
let top_pointer = cp949_top_hangul_encode(bmp) as usize;
let top_lead = (top_pointer / (190 - 12)) + 0x81;
let top_trail = top_pointer % (190 - 12);
(top_lead as u8, top_trail as u8)
} else {
// To the left of KS X 1001
let left_pointer = cp949_left_hangul_encode(bmp) as usize;
let left_lead = (left_pointer / (190 - 94 - 12)) + (0x81 + 0x20);
let left_trail = left_pointer % (190 - 94 - 12);
(left_lead as u8, left_trail as u8)
};
let offset = if cp949_trail >= (0x40 - 12) {
0x41 + 12
} else if cp949_trail >= (0x20 - 6) {
0x41 + 6
} else {
0x41
};
(lead as u8, (cp949_trail + offset) as u8)
}
}
}
#[cfg(feature = "fast-hangul-encode")]
#[inline(always)]
fn ksx1001_encode_hangul(_: u16, bmp_minus_hangul_start: u16) -> (u8, u8) {
cp949_hangul_encode(bmp_minus_hangul_start)
}
#[cfg(not(feature = "fast-hanja-encode"))]
#[inline(always)]
fn ksx1001_encode_hanja(bmp: u16) -> Option<(u8, u8)> {
if let Some(hanja_pointer) = position(&KSX1001_HANJA[..], bmp) {
let hanja_lead = (hanja_pointer / 94) + (0x81 + 0x49);
let hanja_trail = (hanja_pointer % 94) + 0xA1;
Some((hanja_lead as u8, hanja_trail as u8))
} else {
None
}
}
#[cfg(feature = "fast-hanja-encode")]
#[inline(always)]
fn ksx1001_encode_hanja(bmp: u16) -> Option<(u8, u8)> {
if bmp < 0xF900 {
ksx1001_unified_hangul_encode(bmp)
} else {
Some(ksx1001_compatibility_hangul_encode(bmp))
}
}
pub struct EucKrEncoder;
impl EucKrEncoder {
pub fn new(encoding: &'static Encoding) -> Encoder {
Encoder::new(encoding, VariantEncoder::EucKr(EucKrEncoder))
}
pub fn max_buffer_length_from_utf16_without_replacement(
&self,
u16_length: usize,
) -> Option<usize> {
u16_length.checked_mul(2)
}
pub fn max_buffer_length_from_utf8_without_replacement(
&self,
byte_length: usize,
) -> Option<usize> {
byte_length.checked_add(1)
}
ascii_compatible_bmp_encoder_functions!(
{
let bmp_minus_hangul_start = bmp.wrapping_sub(0xAC00);
let (lead, trail) = if bmp_minus_hangul_start < (0xD7A4 - 0xAC00) {
// Hangul
ksx1001_encode_hangul(bmp, bmp_minus_hangul_start)
} else if in_range16(bmp, 0x33DE, 0xFF01) {
// Vast range that includes no other
// mappables except Hangul (already
// processed) and Hanja.
// Narrow the range further to Unified and
// Compatibility ranges of Hanja.
if in_range16(bmp, 0x4E00, 0x9F9D) || in_range16(bmp, 0xF900, 0xFA0C) {
if let Some((hanja_lead, hanja_trail)) = ksx1001_encode_hanja(bmp) {
(hanja_lead, hanja_trail)
} else {
return (
EncoderResult::unmappable_from_bmp(bmp),
source.consumed(),
handle.written(),
);
}
} else {
return (
EncoderResult::unmappable_from_bmp(bmp),
source.consumed(),
handle.written(),
);
}
} else if let Some((lead, trail)) = ksx1001_encode_misc(bmp) {
(lead as u8, trail as u8)
} else {
return (
EncoderResult::unmappable_from_bmp(bmp),
source.consumed(),
handle.written(),
);
};
handle.write_two(lead, trail)
},
bmp,
self,
source,
handle,
copy_ascii_to_check_space_two,
check_space_two,
true
);
}
// Any copyright to the test code below this comment is dedicated to the
#[cfg(all(test, feature = "alloc"))]
mod tests {
use super::super::testing::*;
use super::super::*;
fn decode_euc_kr(bytes: &[u8], expect: &str) {
decode(EUC_KR, bytes, expect);
}
fn encode_euc_kr(string: &str, expect: &[u8]) {
encode(EUC_KR, string, expect);
}
#[test]
fn test_euc_kr_decode() {
// Empty
decode_euc_kr(b"", &"");
// ASCII
decode_euc_kr(b"\x61\x62", "\u{0061}\u{0062}");
decode_euc_kr(b"\x81\x41", "\u{AC02}");
decode_euc_kr(b"\x81\x5B", "\u{FFFD}\x5B");
decode_euc_kr(b"\xFD\xFE", "\u{8A70}");
decode_euc_kr(b"\xFE\x41", "\u{FFFD}\x41");
decode_euc_kr(b"\xFF\x41", "\u{FFFD}\x41");
decode_euc_kr(b"\x80\x41", "\u{FFFD}\x41");
decode_euc_kr(b"\xA1\xFF", "\u{FFFD}");
decode_euc_kr(b"\x81\xFF", "\u{FFFD}");
}
#[test]
fn test_euc_kr_encode() {
// Empty
encode_euc_kr("", b"");
// ASCII
encode_euc_kr("\u{0061}\u{0062}", b"\x61\x62");
encode_euc_kr("\u{AC02}", b"\x81\x41");
encode_euc_kr("\u{8A70}", b"\xFD\xFE");
}
#[test]
#[cfg_attr(miri, ignore)] // Miri is too slow
fn test_euc_kr_decode_all() {
let input = include_bytes!("test_data/euc_kr_in.txt");
let expectation = include_str!("test_data/euc_kr_in_ref.txt");
let (cow, had_errors) = EUC_KR.decode_without_bom_handling(input);
assert!(had_errors, "Should have had errors.");
assert_eq!(&cow[..], expectation);
}
#[test]
#[cfg_attr(miri, ignore)] // Miri is too slow
fn test_euc_kr_encode_all() {
let input = include_str!("test_data/euc_kr_out.txt");
let expectation = include_bytes!("test_data/euc_kr_out_ref.txt");
let (cow, encoding, had_errors) = EUC_KR.encode(input);
assert!(!had_errors, "Should not have had errors.");
assert_eq!(encoding, EUC_KR);
assert_eq!(&cow[..], &expectation[..]);
}
#[test]
fn test_euc_kr_encode_from_two_low_surrogates() {
let expectation = b"��";
let mut output = [0u8; 40];
let mut encoder = EUC_KR.new_encoder();
let (result, read, written, had_errors) =
encoder.encode_from_utf16(&[0xDC00u16, 0xDEDEu16], &mut output[..], true);
assert_eq!(result, CoderResult::InputEmpty);
assert_eq!(read, 2);
assert_eq!(written, expectation.len());
assert!(had_errors);
assert_eq!(&output[..written], expectation);
}
}