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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 EucJpDecoder {
lead: u8,
jis0212: bool,
}
impl EucJpDecoder {
pub fn new() -> VariantDecoder {
VariantDecoder::EucJp(EucJpDecoder {
lead: 0,
jis0212: false,
})
}
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 >= 0xA1 && b <= 0xFE) || b == 0x8E || b == 0x8F {
self.lead = b;
continue;
}
return (DecoderResult::Malformed(1, 0),
unread_handle.consumed(),
destination_handle.written());
}
let lead = self.lead as usize;
self.lead = 0;
// Comparison to 0xA1 could be hoisted, but the
// form below matches the spec better.
if lead == 0x8E && (b >= 0xA1 && b <= 0xDF) {
destination_handle.write_upper_bmp(0xFF61 - 0xA1 + b as u16);
continue;
}
if lead == 0x8F && (b >= 0xA1 && b <= 0xFE) {
self.lead = b;
self.jis0212 = true;
continue;
}
if (b >= 0xA1 && b <= 0xFE) && (lead >= 0xA1 && lead <= 0xFE) {
let pointer = (lead as usize - 0xA1) * 94usize + (b as usize - 0xA1);
let bmp = if self.jis0212 {
self.jis0212 = false;
jis0212_decode(pointer)
} else {
jis0208_decode(pointer)
};
if bmp != 0 {
destination_handle.write_bmp_excl_ascii(bmp);
continue;
}
}
if b < 0xA1 || b == 0xFF {
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 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) -> 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{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_two(0x8Eu8,
(c as usize - 0xFF61 + 0xA1) as u8);
continue;
}
if c == '\u{2212}' {
destination_handle.write_two(0xA1u8, 0xDDu8);
continue;
}
let pointer = jis0208_encode(c);
if pointer == usize::max_value() {
return (EncoderResult::Unmappable(c),
unread_handle.consumed(),
destination_handle.written());
}
let lead = (pointer / 94) + 0xA1;
let trail = (pointer % 94) + 0xA1;
destination_handle.write_two(lead as u8, trail 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_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}\u{FFFD}");
decode_euc_jp(b"\x8E\xE0", "\u{FFFD}");
decode_euc_jp(b"\x8E\xFF", "\u{FFFD}\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}\u{FFFD}");
// JIS 0208
decode_euc_jp(b"\xA1\xA1", "\u{3000}");
decode_euc_jp(b"\xA1\xA0", "\u{FFFD}\u{FFFD}");
decode_euc_jp(b"\xFC\xFE", "\u{FF02}");
decode_euc_jp(b"\xFE\xFE", "\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");
}
}