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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
// 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;
enum EucJpPending {
None,
Jis0208Lead(u8),
Jis0212Shift,
Jis0212Lead(u8),
HalfWidthKatakana,
}
impl EucJpPending {
fn is_none(&self) -> bool {
match *self {
EucJpPending::None => true,
_ => false,
}
}
fn count(&self) -> usize {
match *self {
EucJpPending::None => 0,
EucJpPending::Jis0208Lead(_)
| EucJpPending::Jis0212Shift
| EucJpPending::HalfWidthKatakana => 1,
EucJpPending::Jis0212Lead(_) => 2,
}
}
}
pub struct EucJpDecoder {
pending: EucJpPending,
}
impl EucJpDecoder {
pub fn new() -> VariantDecoder {
VariantDecoder::EucJp(EucJpDecoder {
pending: EucJpPending::None,
})
}
pub fn in_neutral_state(&self) -> bool {
self.pending.is_none()
}
fn plus_one_if_lead(&self, byte_length: usize) -> Option<usize> {
byte_length.checked_add(if self.pending.is_none() { 0 } else { 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))
}
euc_jp_decoder_functions!(
{
let trail_minus_offset = byte.wrapping_sub(0xA1);
// Fast-track Hiragana (60% according to Lunde)
// and Katakana (10% acconding to Lunde).
if jis0208_lead_minus_offset == 0x03 && trail_minus_offset < 0x53 {
// Hiragana
handle.write_upper_bmp(0x3041 + u16::from(trail_minus_offset))
} else if jis0208_lead_minus_offset == 0x04 && trail_minus_offset < 0x56 {
// Katakana
handle.write_upper_bmp(0x30A1 + u16::from(trail_minus_offset))
} else if trail_minus_offset > (0xFE - 0xA1) {
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 {
let pointer = mul_94(jis0208_lead_minus_offset) + usize::from(trail_minus_offset);
let level1_pointer = pointer.wrapping_sub(1410);
if level1_pointer < JIS0208_LEVEL1_KANJI.len() {
handle.write_upper_bmp(JIS0208_LEVEL1_KANJI[level1_pointer])
} else {
let level2_pointer = pointer.wrapping_sub(4418);
if level2_pointer < JIS0208_LEVEL2_AND_ADDITIONAL_KANJI.len() {
handle.write_upper_bmp(JIS0208_LEVEL2_AND_ADDITIONAL_KANJI[level2_pointer])
} else {
let ibm_pointer = pointer.wrapping_sub(8272);
if ibm_pointer < IBM_KANJI.len() {
handle.write_upper_bmp(IBM_KANJI[ibm_pointer])
} else if let Some(bmp) = jis0208_symbol_decode(pointer) {
handle.write_bmp_excl_ascii(bmp)
} else if let Some(bmp) = jis0208_range_decode(pointer) {
handle.write_bmp_excl_ascii(bmp)
} else {
return (
DecoderResult::Malformed(2, 0),
unread_handle_trail.consumed(),
handle.written(),
);
}
}
}
}
},
{
// If lead is between 0xA1 and 0xFE, inclusive,
// subtract 0xA1.
let jis0212_lead_minus_offset = lead.wrapping_sub(0xA1);
if jis0212_lead_minus_offset > (0xFE - 0xA1) {
if lead < 0x80 {
return (
DecoderResult::Malformed(1, 0),
unread_handle_jis0212.unread(),
handle.written(),
);
}
return (
DecoderResult::Malformed(2, 0),
unread_handle_jis0212.consumed(),
handle.written(),
);
}
jis0212_lead_minus_offset
},
{
// If trail is between 0xA1 and 0xFE, inclusive,
// subtract 0xA1.
let trail_minus_offset = byte.wrapping_sub(0xA1);
if trail_minus_offset > (0xFE - 0xA1) {
if byte < 0x80 {
return (
DecoderResult::Malformed(2, 0),
unread_handle_trail.unread(),
handle.written(),
);
}
return (
DecoderResult::Malformed(3, 0),
unread_handle_trail.consumed(),
handle.written(),
);
}
let pointer = mul_94(jis0212_lead_minus_offset) + usize::from(trail_minus_offset);
let pointer_minus_kanji = pointer.wrapping_sub(1410);
if pointer_minus_kanji < JIS0212_KANJI.len() {
handle.write_upper_bmp(JIS0212_KANJI[pointer_minus_kanji])
} else if let Some(bmp) = jis0212_accented_decode(pointer) {
handle.write_bmp_excl_ascii(bmp)
} else {
let pointer_minus_upper_cyrillic = pointer.wrapping_sub(597);
if pointer_minus_upper_cyrillic <= (607 - 597) {
handle.write_mid_bmp(0x0402 + pointer_minus_upper_cyrillic as u16)
} else {
let pointer_minus_lower_cyrillic = pointer.wrapping_sub(645);
if pointer_minus_lower_cyrillic <= (655 - 645) {
handle.write_mid_bmp(0x0452 + pointer_minus_lower_cyrillic as u16)
} else {
return (
DecoderResult::Malformed(3, 0),
unread_handle_trail.consumed(),
handle.written(),
);
}
}
}
},
{
// If trail is between 0xA1 and 0xDF, inclusive,
// subtract 0xA1 and map to half-width Katakana.
let trail_minus_offset = byte.wrapping_sub(0xA1);
if trail_minus_offset > (0xDF - 0xA1) {
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(),
);
}
handle.write_upper_bmp(0xFF61 + u16::from(trail_minus_offset))
},
self,
non_ascii,
jis0208_lead_minus_offset,
byte,
unread_handle_trail,
jis0212_lead_minus_offset,
lead,
unread_handle_jis0212,
source,
handle
);
}
#[cfg(feature = "fast-kanji-encode")]
#[inline(always)]
fn encode_kanji(bmp: u16) -> Option<(u8, u8)> {
jis0208_kanji_euc_jp_encode(bmp)
}
#[cfg(not(feature = "fast-kanji-encode"))]
#[inline(always)]
fn encode_kanji(bmp: u16) -> Option<(u8, u8)> {
if 0x4EDD == bmp {
// Ideograph on the symbol row!
Some((0xA1, 0xB8))
} else if let Some((lead, trail)) = jis0208_level1_kanji_euc_jp_encode(bmp) {
Some((lead, trail))
} else if let Some(pos) = jis0208_level2_and_additional_kanji_encode(bmp) {
let lead = (pos / 94) + 0xD0;
let trail = (pos % 94) + 0xA1;
Some((lead as u8, trail as u8))
} else if let Some(pos) = position(&IBM_KANJI[..], bmp) {
let lead = (pos / 94) + 0xF9;
let trail = (pos % 94) + 0xA1;
Some((lead as u8, trail as u8))
} else {
None
}
}
pub struct EucJpEncoder;
impl EucJpEncoder {
pub fn new(encoding: &'static Encoding) -> Encoder {
Encoder::new(encoding, VariantEncoder::EucJp(EucJpEncoder))
}
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!(
{
// Lunde says 60% Hiragana, 30% Kanji, 10% Katakana
let bmp_minus_hiragana = bmp.wrapping_sub(0x3041);
if bmp_minus_hiragana < 0x53 {
handle.write_two(0xA4, 0xA1 + bmp_minus_hiragana as u8)
} else if in_inclusive_range16(bmp, 0x4E00, 0x9FA0) {
if let Some((lead, trail)) = encode_kanji(bmp) {
handle.write_two(lead, trail)
} else {
return (
EncoderResult::unmappable_from_bmp(bmp),
source.consumed(),
handle.written(),
);
}
} else {
let bmp_minus_katakana = bmp.wrapping_sub(0x30A1);
if bmp_minus_katakana < 0x56 {
handle.write_two(0xA5, 0xA1 + bmp_minus_katakana as u8)
} else {
let bmp_minus_space = bmp.wrapping_sub(0x3000);
if bmp_minus_space < 3 {
// fast-track common punctuation
handle.write_two(0xA1, 0xA1 + bmp_minus_space as u8)
} else if bmp == 0xA5 {
handle.write_one(0x5Cu8)
} else if bmp == 0x203E {
handle.write_one(0x7Eu8)
} else if in_inclusive_range16(bmp, 0xFF61, 0xFF9F) {
handle.write_two(0x8Eu8, (bmp - (0xFF61 - 0xA1)) as u8)
} else if bmp == 0x2212 {
handle.write_two(0xA1u8, 0xDDu8)
} else if let Some(pointer) = jis0208_range_encode(bmp) {
let lead = (pointer / 94) + 0xA1;
let trail = (pointer % 94) + 0xA1;
handle.write_two(lead as u8, trail as u8)
} else if in_inclusive_range16(bmp, 0xFA0E, 0xFA2D)
|| bmp == 0xF929
|| bmp == 0xF9DC
{
// Guaranteed to be found in IBM_KANJI
let pos = position(&IBM_KANJI[..], bmp).unwrap();
let lead = (pos / 94) + 0xF9;
let trail = (pos % 94) + 0xA1;
handle.write_two(lead as u8, trail as u8)
} else if let Some(pointer) = ibm_symbol_encode(bmp) {
let lead = (pointer / 94) + 0xA1;
let trail = (pointer % 94) + 0xA1;
handle.write_two(lead as u8, trail as u8)
} else if let Some(pointer) = jis0208_symbol_encode(bmp) {
let lead = (pointer / 94) + 0xA1;
let trail = (pointer % 94) + 0xA1;
handle.write_two(lead as u8, trail as u8)
} else {
return (
EncoderResult::unmappable_from_bmp(bmp),
source.consumed(),
handle.written(),
);
}
}
}
},
bmp,
self,
source,
handle,
copy_ascii_to_check_space_two,
check_space_two,
false
);
}
// 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_jp(bytes: &[u8], expect: &str) {
decode(EUC_JP, bytes, expect);
}
fn encode_euc_jp(string: &str, expect: &[u8]) {
encode(EUC_JP, string, expect);
}
#[test]
fn test_euc_jp_decode() {
// Empty
decode_euc_jp(b"", &"");
// ASCII
decode_euc_jp(b"\x61\x62", "\u{0061}\u{0062}");
// Half-width
decode_euc_jp(b"\x8E\xA1", "\u{FF61}");
decode_euc_jp(b"\x8E\xDF", "\u{FF9F}");
decode_euc_jp(b"\x8E\xA0", "\u{FFFD}");
decode_euc_jp(b"\x8E\xE0", "\u{FFFD}");
decode_euc_jp(b"\x8E\xFF", "\u{FFFD}");
decode_euc_jp(b"\x8E", "\u{FFFD}");
// JIS 0212
decode_euc_jp(b"\x8F\xA1\xA1", "\u{FFFD}");
decode_euc_jp(b"\x8F\xA2\xAF", "\u{02D8}");
decode_euc_jp(b"\x8F\xA2\xFF", "\u{FFFD}");
decode_euc_jp(b"\x8F\xA1", "\u{FFFD}");
decode_euc_jp(b"\x8F", "\u{FFFD}");
// JIS 0208
decode_euc_jp(b"\xA1\xA1", "\u{3000}");
decode_euc_jp(b"\xA1\xA0", "\u{FFFD}");
decode_euc_jp(b"\xFC\xFE", "\u{FF02}");
decode_euc_jp(b"\xFE\xFE", "\u{FFFD}");
decode_euc_jp(b"\xA1", "\u{FFFD}");
// Bad leads
decode_euc_jp(b"\xFF\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\xA0\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x80\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x81\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x82\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x83\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x84\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x85\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x86\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x87\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x88\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x89\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x8A\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x8B\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x8C\xA1\xA1", "\u{FFFD}\u{3000}");
decode_euc_jp(b"\x8D\xA1\xA1", "\u{FFFD}\u{3000}");
// Bad ASCII trail
decode_euc_jp(b"\xA1\x40", "\u{FFFD}\u{0040}");
}
#[test]
fn test_euc_jp_encode() {
// Empty
encode_euc_jp("", b"");
// ASCII
encode_euc_jp("\u{0061}\u{0062}", b"\x61\x62");
// Exceptional code points
encode_euc_jp("\u{00A5}", b"\x5C");
encode_euc_jp("\u{203E}", b"\x7E");
encode_euc_jp("\u{2212}", b"\xA1\xDD");
// Half-width
encode_euc_jp("\u{FF61}", b"\x8E\xA1");
encode_euc_jp("\u{FF9F}", b"\x8E\xDF");
// JIS 0212
encode_euc_jp("\u{02D8}", b"˘");
// JIS 0208
encode_euc_jp("\u{3000}", b"\xA1\xA1");
encode_euc_jp("\u{FF02}", b"\xFC\xFE");
}
#[test]
#[cfg_attr(miri, ignore)] // Miri is too slow
fn test_jis0208_decode_all() {
let input = include_bytes!("test_data/jis0208_in.txt");
let expectation = include_str!("test_data/jis0208_in_ref.txt");
let (cow, had_errors) = EUC_JP.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_jis0208_encode_all() {
let input = include_str!("test_data/jis0208_out.txt");
let expectation = include_bytes!("test_data/jis0208_out_ref.txt");
let (cow, encoding, had_errors) = EUC_JP.encode(input);
assert!(!had_errors, "Should not have had errors.");
assert_eq!(encoding, EUC_JP);
assert_eq!(&cow[..], &expectation[..]);
}
#[test]
#[cfg_attr(miri, ignore)] // Miri is too slow
fn test_jis0212_decode_all() {
let input = include_bytes!("test_data/jis0212_in.txt");
let expectation = include_str!("test_data/jis0212_in_ref.txt");
let (cow, had_errors) = EUC_JP.decode_without_bom_handling(input);
assert!(had_errors, "Should have had errors.");
assert_eq!(&cow[..], expectation);
}
}