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// Copyright 2015-2016 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 handles::*;
use data::*;
use variant::*;
use super::*;
pub struct ShiftJisDecoder {
lead: u8,
}
impl ShiftJisDecoder {
pub fn new() -> VariantDecoder {
VariantDecoder::ShiftJis(ShiftJisDecoder { lead: 0 })
}
fn plus_one_if_lead(&self, byte_length: usize) -> usize {
byte_length +
if self.lead == 0 {
0
} else {
1
}
}
pub fn max_utf16_buffer_length(&self, byte_length: usize) -> usize {
self.plus_one_if_lead(byte_length)
}
pub fn max_utf8_buffer_length_without_replacement(&self, byte_length: usize) -> usize {
// worst case: 2 to 3
let len = self.plus_one_if_lead(byte_length);
len + (len + 1) / 2
}
pub fn max_utf8_buffer_length(&self, byte_length: usize) -> usize {
self.plus_one_if_lead(byte_length) * 3
}
decoder_functions!({},
{
if self.lead != 0 {
self.lead = 0;
return (DecoderResult::Malformed(1, 0),
src_consumed,
dest.written());
}
},
{
if self.lead == 0 {
if b <= 0x7f {
// TODO optimize ASCII run
destination_handle.write_ascii(b);
continue;
}
if b == 0x80 {
destination_handle.write_mid_bmp(b as u16);
continue;
}
if b >= 0xA1 && b <= 0xDF {
destination_handle.write_upper_bmp(0xFF61 - 0xA1 + b as u16);
continue;
}
if (b >= 0x81 && b <= 0x9F) || (b >= 0xE0 && b <= 0xFC) {
self.lead = b;
continue;
}
return (DecoderResult::Malformed(1, 0),
unread_handle.consumed(),
destination_handle.written());
}
let lead = self.lead as usize;
self.lead = 0;
let offset = if b < 0x7F {
0x40usize
} else {
0x41usize
};
let lead_offset = if lead < 0xA0 {
0x81usize
} else {
0xC1usize
};
if (b >= 0x40 && b <= 0x7E) || (b >= 0x80 && b <= 0xFC) {
let pointer = (lead as usize - lead_offset) * 188usize +
(b as usize - offset);
if pointer >= 8836 && pointer <= 10528 {
destination_handle.write_upper_bmp((0xE000 - 8836 + pointer) as u16);
continue;
}
let bmp = jis0208_decode(pointer);
if bmp != 0 {
destination_handle.write_bmp_excl_ascii(bmp);
continue;
}
}
if b <= 0x7F {
return (DecoderResult::Malformed(1, 0),
unread_handle.unread(),
destination_handle.written());
}
return (DecoderResult::Malformed(2, 0),
unread_handle.consumed(),
destination_handle.written());
},
self,
src_consumed,
dest,
b,
destination_handle,
unread_handle,
check_space_bmp);
}
pub struct ShiftJisEncoder;
impl ShiftJisEncoder {
pub fn new(encoding: &'static Encoding) -> Encoder {
Encoder::new(encoding, VariantEncoder::ShiftJis(ShiftJisEncoder))
}
pub fn max_buffer_length_from_utf16_without_replacement(&self, u16_length: usize) -> usize {
u16_length * 2
}
pub fn max_buffer_length_from_utf8_without_replacement(&self, byte_length: usize) -> usize {
byte_length
}
encoder_functions!({},
{
if c <= '\u{7F}' {
// TODO optimize ASCII run
destination_handle.write_one(c as u8);
continue;
}
if c == '\u{80}' {
destination_handle.write_one(0x80u8);
continue;
}
if c == '\u{A5}' {
destination_handle.write_one(0x5Cu8);
continue;
}
if c == '\u{203E}' {
destination_handle.write_one(0x7Eu8);
continue;
}
if c >= '\u{FF61}' && c <= '\u{FF9F}' {
destination_handle.write_one((c as usize - 0xFF61 + 0xA1) as u8);
continue;
}
if c == '\u{2212}' {
destination_handle.write_two(0x81u8, 0x7Cu8);
continue;
}
let pointer = shift_jis_encode(c);
if pointer == usize::max_value() {
return (EncoderResult::Unmappable(c),
unread_handle.consumed(),
destination_handle.written());
}
let lead = pointer / 188;
let lead_offset = if lead < 0x1F {
0x81usize
} else {
0xC1usize
};
let trail = pointer % 188;
let trail_offset = if trail < 0x3F {
0x40usize
} else {
0x41usize
};
destination_handle.write_two((lead + lead_offset) as u8,
(trail + trail_offset) as u8);
continue;
},
self,
src_consumed,
source,
dest,
c,
destination_handle,
unread_handle,
check_space_two);
}
// Any copyright to the test code below this comment is dedicated to the
// Public Domain. http://creativecommons.org/publicdomain/zero/1.0/
#[cfg(test)]
mod tests {
use super::super::testing::*;
use super::super::*;
fn decode_shift_jis(bytes: &[u8], expect: &str) {
decode(SHIFT_JIS, bytes, expect);
}
fn encode_shift_jis(string: &str, expect: &[u8]) {
encode(SHIFT_JIS, string, expect);
}
#[test]
fn test_shift_jis_decode() {
// Empty
decode_shift_jis(b"", &"");
// ASCII
decode_shift_jis(b"\x61\x62", "\u{0061}\u{0062}");
// Half-width
decode_shift_jis(b"\xA1", "\u{FF61}");
decode_shift_jis(b"\xDF", "\u{FF9F}");
decode_shift_jis(b"\xA0", "\u{FFFD}");
decode_shift_jis(b"\xE0", "\u{FFFD}");
decode_shift_jis(b"\xA0+", "\u{FFFD}+");
decode_shift_jis(b"\xE0+", "\u{FFFD}+");
// EUDC
decode_shift_jis(b"\xF0\x40", "\u{E000}");
decode_shift_jis(b"\xF9\x40", "\u{E69C}");
decode_shift_jis(b"\xEA\xFC", "\u{FFFD}");
decode_shift_jis(b"\xF9\x41", "\u{FFFD}A");
// JIS 0208
decode_shift_jis(b"\x81\x40", "\u{3000}");
decode_shift_jis(b"\x81\x3F", "\u{FFFD}?");
decode_shift_jis(b"\xEE\xFC", "\u{FF02}");
decode_shift_jis(b"\xEE\xFD", "\u{FFFD}");
decode_shift_jis(b"\xFA\x40", "\u{2170}");
decode_shift_jis(b"\xFA\x3F", "\u{FFFD}?");
decode_shift_jis(b"\xFC\x4B", "\u{9ED1}");
decode_shift_jis(b"\xFC\x4C", "\u{FFFD}L");
//
}
#[test]
fn test_shift_jis_encode() {
// Empty
encode_shift_jis("", b"");
// ASCII
encode_shift_jis("\u{0061}\u{0062}", b"\x61\x62");
// Exceptional code points
encode_shift_jis("\u{0080}", b"\x80");
encode_shift_jis("\u{00A5}", b"\x5C");
encode_shift_jis("\u{203E}", b"\x7E");
encode_shift_jis("\u{2212}", b"\x81\x7C");
// Half-width
encode_shift_jis("\u{FF61}", b"\xA1");
encode_shift_jis("\u{FF9F}", b"\xDF");
// EUDC
encode_shift_jis("\u{E000}", b"");
encode_shift_jis("\u{E69C}", b"");
// JIS 0212
encode_shift_jis("\u{02D8}", b"˘");
// JIS 0208
encode_shift_jis("\u{3000}", b"\x81\x40");
encode_shift_jis("\u{FF02}", b"\xFA\x57");
encode_shift_jis("\u{2170}", b"\xFA\x40");
encode_shift_jis("\u{9ED1}", b"\xFC\x4B");
}
}