69 lines
1.8 KiB
Dart
69 lines
1.8 KiB
Dart
import 'dart:convert';
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import 'dart:math';
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import 'euc_jp_table.dart';
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const eucJp = EucJPCodec();
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class EucJPDecoder extends Converter<List<int>, String> {
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final bool _allowMalformed;
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const EucJPDecoder([this._allowMalformed = false]);
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@override
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convert(input) {
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List<int> result = [];
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for (int i = 0; i < input.length; i++) {
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var c1 = input[i];
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if (c1 <= 0x7E) {
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// ASCII Compatible
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result.addAll(EUC_TABLE[c1] ?? []);
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} else if (c1 == 0x8e) {
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// Hiragana
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var c2 = input[++i];
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result.addAll(EUC_TABLE[(c1 << 8) + c2] ?? []);
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} else if (c1 == 0x8f) {
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// JIS X 0212
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var c2 = input[++i];
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var c3 = input[++i];
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result.addAll(EUC_TABLE[(c1 << 16) + (c2 << 8) + c3] ?? []);
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} else {
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// JIS X 0208
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var c2 = input[++i];
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result.addAll(EUC_TABLE[(c1 << 8) + c2] ?? []);
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}
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}
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return utf8.decode(result);
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}
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}
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class EucJPEncoder extends Converter<String, List<int>> {
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const EucJPEncoder();
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@override
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List<int> convert(String s) {
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List<int> result = [];
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for (int i = 0; i < s.length; i++) {
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var bytes = utf8.encode(s[i]);
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var value = 0;
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for (var i = 0, length = bytes.length; i < length; i++) {
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value += bytes[i] * (pow(256, (bytes.length - i - 1)) as int);
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}
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result.addAll(UTF_TABLE[value] ?? []);
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}
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return result;
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}
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}
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class EucJPCodec extends Encoding {
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final bool _allowMalformed;
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const EucJPCodec([this._allowMalformed = false]);
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@override
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Converter<List<int>, String> get decoder =>
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_allowMalformed ? const EucJPDecoder(true) : const EucJPDecoder();
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@override
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Converter<String, List<int>> get encoder => const EucJPEncoder();
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@override
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String get name => 'euc-jp';
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}
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