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bun.sh/test/js/web/encoding/text-decoder-wpt.test.ts
robobun 9fd5b20aa3 feat: Add WebKit text codec support for 24 additional encodings (#21835) 
## Summary
This PR integrates WebKit's text codec implementations into Bun's
TextDecoder, adding support for 24 additional character encodings beyond
the native UTF-8, UTF-16, and Latin1.

Fixes https://github.com/oven-sh/bun/issues/11564

## What's New
### Supported Encodings (24 total)
- **11 single-byte encodings**: IBM866, ISO-8859-3/6/7/8/8-I, KOI8-U,
windows-874/1253/1255/1257
- **7 CJK encodings**: Big5, EUC-JP, ISO-2022-JP, Shift_JIS, EUC-KR,
GBK, GB18030
- **2 special encodings**: x-user-defined, replacement

### Implementation Details
- Integrated WebKit's text codec C++ implementations
- Generated static encoding tables from WHATWG spec (no ICU dependency)
- Created C++ wrapper for Zig/C++ interop
- All encoding aliases are supported (e.g., `sjis` → `shift_jis`)
- Proper whitespace trimming for encoding labels

## Testing
- ✅ Added comprehensive tests for all supported encodings
- ✅ Passes Web Platform Tests for single-byte decoders
- ✅ Passes Web Platform Tests for encoding labels
- ✅ All 2,227 tests pass

## Test Output
```
bun test v1.2.19 (9feaab47)
 2207 pass
 0 fail
 5012 expect() calls
Ran 2207 tests across 1 file. [899.00ms]
```

## Not Included
The following encodings were not added due to ICU data loading
constraints:
- ISO-8859-2, 4, 5, 10, 13, 14, 15, 16
- Windows-1250, 1251, 1254, 1256, 1258
- KOI8-R, macintosh, x-mac-cyrillic

## Example Usage
```javascript
// CJK encodings
const decoder = new TextDecoder("shift_jis");
const bytes = new Uint8Array([0x82, 0xb1, 0x82, 0xf1]);
console.log(decoder.decode(bytes)); // "こん"

// Single-byte encodings
const greekDecoder = new TextDecoder("iso-8859-7");
const greekBytes = new Uint8Array([0xC3, 0xe5, 0xe9, 0xdc]);
console.log(greekDecoder.decode(greekBytes)); // "Γειά"
```

🤖 Generated with [Claude Code](https://claude.ai/code)

---------

Co-authored-by: Claude <claude@anthropic.ai>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
2025-08-14 22:58:25 -07:00

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/**
* Web Platform Tests for TextDecoder
* Based on: https://github.com/web-platform-tests/wpt/tree/master/encoding
*
* This file contains tests from:
* - single-byte-decoder.window.js
* - textdecoder-labels.any.js
*/
import { describe, expect, test } from "bun:test";
// From https://github.com/web-platform-tests/wpt/blob/master/encoding/single-byte-decoder.window.js
describe("WPT: single-byte-decoder", () => {
// Single-byte encoding indexes from https://encoding.spec.whatwg.org/indexes.json
const singleByteIndexes = {
"IBM866": [
1040, 1041, 1042, 1043, 1044, 1045, 1046, 1047, 1048, 1049, 1050, 1051, 1052, 1053, 1054, 1055, 1056, 1057, 1058,
1059, 1060, 1061, 1062, 1063, 1064, 1065, 1066, 1067, 1068, 1069, 1070, 1071, 1072, 1073, 1074, 1075, 1076, 1077,
1078, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086, 1087, 9617, 9618, 9619, 9474, 9508, 9569, 9570, 9558, 9557,
9571, 9553, 9559, 9565, 9564, 9563, 9488, 9492, 9524, 9516, 9500, 9472, 9532, 9566, 9567, 9562, 9556, 9577, 9574,
9568, 9552, 9580, 9575, 9576, 9572, 9573, 9561, 9560, 9554, 9555, 9579, 9578, 9496, 9484, 9608, 9604, 9612, 9616,
9600, 1088, 1089, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098, 1099, 1100, 1101, 1102, 1103, 1025, 1105,
1028, 1108, 1031, 1111, 1038, 1118, 176, 8729, 183, 8730, 8470, 164, 9632, 160,
],
"ISO-8859-3": [
128,
129,
130,
131,
132,
133,
134,
135,
136,
137,
138,
139,
140,
141,
142,
143,
144,
145,
146,
147,
148,
149,
150,
151,
152,
153,
154,
155,
156,
157,
158,
159,
160,
294,
728,
163,
164,
null,
292,
167,
168,
304,
350,
286,
308,
173,
null,
379,
176,
295,
178,
179,
180,
181,
293,
183,
184,
305,
351,
287,
309,
189,
null,
380,
192,
193,
194,
null,
196,
266,
264,
199,
200,
201,
202,
203,
204,
205,
206,
207,
null,
209,
210,
211,
212,
288,
214,
215,
284,
217,
218,
219,
220,
364,
348,
223,
224,
225,
226,
null,
228,
267,
265,
231,
232,
233,
234,
235,
236,
237,
238,
239,
null,
241,
242,
243,
244,
289,
246,
247,
285,
249,
250,
251,
252,
365,
349,
729,
],
"ISO-8859-6": [
128,
129,
130,
131,
132,
133,
134,
135,
136,
137,
138,
139,
140,
141,
142,
143,
144,
145,
146,
147,
148,
149,
150,
151,
152,
153,
154,
155,
156,
157,
158,
159,
160,
null,
null,
null,
164,
null,
null,
null,
null,
null,
null,
null,
1548,
173,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
1563,
null,
null,
null,
1567,
null,
1569,
1570,
1571,
1572,
1573,
1574,
1575,
1576,
1577,
1578,
1579,
1580,
1581,
1582,
1583,
1584,
1585,
1586,
1587,
1588,
1589,
1590,
1591,
1592,
1593,
1594,
null,
null,
null,
null,
null,
1600,
1601,
1602,
1603,
1604,
1605,
1606,
1607,
1608,
1609,
1610,
1611,
1612,
1613,
1614,
1615,
1616,
1617,
1618,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
],
"ISO-8859-7": [
128,
129,
130,
131,
132,
133,
134,
135,
136,
137,
138,
139,
140,
141,
142,
143,
144,
145,
146,
147,
148,
149,
150,
151,
152,
153,
154,
155,
156,
157,
158,
159,
160,
8216,
8217,
163,
8364,
8367,
166,
167,
168,
169,
890,
171,
172,
173,
null,
8213,
176,
177,
178,
179,
900,
901,
902,
183,
904,
905,
906,
187,
908,
189,
910,
911,
912,
913,
914,
915,
916,
917,
918,
919,
920,
921,
922,
923,
924,
925,
926,
927,
928,
929,
null,
931,
932,
933,
934,
935,
936,
937,
938,
939,
940,
941,
942,
943,
944,
945,
946,
947,
948,
949,
950,
951,
952,
953,
954,
955,
956,
957,
958,
959,
960,
961,
962,
963,
964,
965,
966,
967,
968,
969,
970,
971,
972,
973,
974,
null,
],
"ISO-8859-8": [
128,
129,
130,
131,
132,
133,
134,
135,
136,
137,
138,
139,
140,
141,
142,
143,
144,
145,
146,
147,
148,
149,
150,
151,
152,
153,
154,
155,
156,
157,
158,
159,
160,
null,
162,
163,
164,
165,
166,
167,
168,
169,
215,
171,
172,
173,
174,
175,
176,
177,
178,
179,
180,
181,
182,
183,
184,
185,
247,
187,
188,
189,
190,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
8215,
1488,
1489,
1490,
1491,
1492,
1493,
1494,
1495,
1496,
1497,
1498,
1499,
1500,
1501,
1502,
1503,
1504,
1505,
1506,
1507,
1508,
1509,
1510,
1511,
1512,
1513,
1514,
null,
null,
8206,
8207,
null,
],
"KOI8-U": [
9472, 9474, 9484, 9488, 9492, 9496, 9500, 9508, 9516, 9524, 9532, 9600, 9604, 9608, 9612, 9616, 9617, 9618, 9619,
8992, 9632, 8729, 8730, 8776, 8804, 8805, 160, 8993, 176, 178, 183, 247, 9552, 9553, 9554, 1105, 1108, 9556, 1110,
1111, 9559, 9560, 9561, 9562, 9563, 1169, 1118, 9566, 9567, 9568, 9569, 1025, 1028, 9571, 1030, 1031, 9574, 9575,
9576, 9577, 9578, 1168, 1038, 169, 1102, 1072, 1073, 1094, 1076, 1077, 1092, 1075, 1093, 1080, 1081, 1082, 1083,
1084, 1085, 1086, 1087, 1103, 1088, 1089, 1090, 1091, 1078, 1074, 1100, 1099, 1079, 1096, 1101, 1097, 1095, 1098,
1070, 1040, 1041, 1062, 1044, 1045, 1060, 1043, 1061, 1048, 1049, 1050, 1051, 1052, 1053, 1054, 1055, 1071, 1056,
1057, 1058, 1059, 1046, 1042, 1068, 1067, 1047, 1064, 1069, 1065, 1063, 1066,
],
"windows-874": [
8364,
129,
130,
131,
132,
8230,
134,
135,
136,
137,
138,
139,
140,
141,
142,
143,
144,
8216,
8217,
8220,
8221,
8226,
8211,
8212,
152,
153,
154,
155,
156,
157,
158,
159,
160,
3585,
3586,
3587,
3588,
3589,
3590,
3591,
3592,
3593,
3594,
3595,
3596,
3597,
3598,
3599,
3600,
3601,
3602,
3603,
3604,
3605,
3606,
3607,
3608,
3609,
3610,
3611,
3612,
3613,
3614,
3615,
3616,
3617,
3618,
3619,
3620,
3621,
3622,
3623,
3624,
3625,
3626,
3627,
3628,
3629,
3630,
3631,
3632,
3633,
3634,
3635,
3636,
3637,
3638,
3639,
3640,
3641,
3642,
null,
null,
null,
null,
3647,
3648,
3649,
3650,
3651,
3652,
3653,
3654,
3655,
3656,
3657,
3658,
3659,
3660,
3661,
3662,
3663,
3664,
3665,
3666,
3667,
3668,
3669,
3670,
3671,
3672,
3673,
3674,
3675,
null,
null,
null,
null,
],
"windows-1252": [
8364, 129, 8218, 402, 8222, 8230, 8224, 8225, 710, 8240, 352, 8249, 338, 141, 381, 143, 144, 8216, 8217, 8220,
8221, 8226, 8211, 8212, 732, 8482, 353, 8250, 339, 157, 382, 376, 160, 161, 162, 163, 164, 165, 166, 167, 168,
169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214,
215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237,
238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255,
],
"windows-1253": [
8364,
129,
8218,
402,
8222,
8230,
8224,
8225,
136,
8240,
138,
8249,
140,
141,
142,
143,
144,
8216,
8217,
8220,
8221,
8226,
8211,
8212,
152,
8482,
154,
8250,
156,
157,
158,
159,
160,
901,
902,
163,
164,
165,
166,
167,
168,
169,
null,
171,
172,
173,
174,
8213,
176,
177,
178,
179,
900,
181,
182,
183,
904,
905,
906,
187,
908,
189,
910,
911,
912,
913,
914,
915,
916,
917,
918,
919,
920,
921,
922,
923,
924,
925,
926,
927,
928,
929,
null,
931,
932,
933,
934,
935,
936,
937,
938,
939,
940,
941,
942,
943,
944,
945,
946,
947,
948,
949,
950,
951,
952,
953,
954,
955,
956,
957,
958,
959,
960,
961,
962,
963,
964,
965,
966,
967,
968,
969,
970,
971,
972,
973,
974,
null,
],
"windows-1255": [
8364,
129,
8218,
402,
8222,
8230,
8224,
8225,
710,
8240,
138,
8249,
140,
141,
142,
143,
144,
8216,
8217,
8220,
8221,
8226,
8211,
8212,
732,
8482,
154,
8250,
156,
157,
158,
159,
160,
161,
162,
163,
8362,
165,
166,
167,
168,
169,
215,
171,
172,
173,
174,
175,
176,
177,
178,
179,
180,
181,
182,
183,
184,
185,
247,
187,
188,
189,
190,
191,
1456,
1457,
1458,
1459,
1460,
1461,
1462,
1463,
1464,
1465,
1466,
1467,
1468,
1469,
1470,
1471,
1472,
1473,
1474,
1475,
1520,
1521,
1522,
1523,
1524,
null,
null,
null,
null,
null,
null,
null,
1488,
1489,
1490,
1491,
1492,
1493,
1494,
1495,
1496,
1497,
1498,
1499,
1500,
1501,
1502,
1503,
1504,
1505,
1506,
1507,
1508,
1509,
1510,
1511,
1512,
1513,
1514,
null,
null,
8206,
8207,
null,
],
"windows-1257": [
8364,
129,
8218,
131,
8222,
8230,
8224,
8225,
136,
8240,
138,
8249,
140,
168,
711,
184,
144,
8216,
8217,
8220,
8221,
8226,
8211,
8212,
152,
8482,
154,
8250,
156,
175,
731,
159,
160,
null,
162,
163,
164,
null,
166,
167,
216,
169,
342,
171,
172,
173,
174,
198,
176,
177,
178,
179,
180,
181,
182,
183,
248,
185,
343,
187,
188,
189,
190,
230,
260,
302,
256,
262,
196,
197,
280,
274,
268,
201,
377,
278,
290,
310,
298,
315,
352,
323,
325,
211,
332,
213,
214,
215,
370,
321,
346,
362,
220,
379,
381,
223,
261,
303,
257,
263,
228,
229,
281,
275,
269,
233,
378,
279,
291,
311,
299,
316,
353,
324,
326,
243,
333,
245,
246,
247,
371,
322,
347,
363,
252,
380,
382,
729,
],
};
// Supported encodings (those not removed due to ICU removal)
const supportedEncodings = [
"IBM866",
"ISO-8859-3",
"ISO-8859-6",
"ISO-8859-7",
"ISO-8859-8",
"KOI8-U",
"windows-874",
"windows-1252",
"windows-1253",
"windows-1255",
"windows-1257",
];
// Create test buffer with all bytes 0-255
const buffer = new ArrayBuffer(256);
const view = new Uint8Array(buffer);
for (let i = 0; i < 256; i++) {
view[i] = i;
}
for (const encoding of supportedEncodings) {
test(`${encoding} decodes all bytes correctly`, () => {
const decoder = new TextDecoder(encoding);
const decoded = decoder.decode(view);
// Check each character
for (let i = 0; i < 256; i++) {
const actual = decoded.charCodeAt(i);
let expected;
if (i < 0x80) {
expected = i; // ASCII range
} else {
expected = singleByteIndexes[encoding][i - 0x80];
if (expected == null) {
expected = 0xfffd; // Replacement character
}
}
expect(actual).toBe(expected);
}
});
}
});
// From https://github.com/web-platform-tests/wpt/blob/master/encoding/textdecoder-labels.any.js
describe("WPT: textdecoder-labels", () => {
const whitespace = [" ", "\t", "\n", "\f", "\r"];
const encodingLabels: Record<string, string[]> = {
"utf-8": ["utf-8", "utf8", "unicode-1-1-utf-8"],
"ibm866": ["ibm866", "866", "cp866", "csibm866"],
"iso-8859-3": ["iso-8859-3", "iso8859-3", "iso_8859-3", "latin3", "iso-ir-109", "l3", "csisolatin3"],
"iso-8859-6": ["iso-8859-6", "iso8859-6", "iso_8859-6", "arabic", "asmo-708", "ecma-114", "iso-ir-127"],
"iso-8859-7": [
"iso-8859-7",
"iso8859-7",
"iso_8859-7",
"greek",
"greek8",
"iso-ir-126",
"elot_928",
"ecma-118",
"csisolatingreek",
],
"iso-8859-8": ["iso-8859-8", "iso8859-8", "iso_8859-8", "hebrew", "iso-ir-138", "csisolatinhebrew", "visual"],
"iso-8859-8-i": ["iso-8859-8-i", "csiso88598i", "logical"],
"koi8-u": ["koi8-u", "koi8-ru"],
"windows-874": ["windows-874", "dos-874", "iso-8859-11", "iso8859-11", "iso885911", "tis-620"],
"windows-1252": [
"windows-1252",
"cp1252",
"x-cp1252",
"ansi_x3.4-1968",
"ascii",
"cp819",
"csisolatin1",
"ibm819",
"iso-8859-1",
"iso-ir-100",
"iso8859-1",
"iso88591",
"iso_8859-1",
"iso_8859-1:1987",
"l1",
"latin1",
"us-ascii",
],
"windows-1253": ["windows-1253", "cp1253", "x-cp1253"],
"windows-1255": ["windows-1255", "cp1255", "x-cp1255"],
"windows-1257": ["windows-1257", "cp1257", "x-cp1257"],
"utf-16be": ["utf-16be"],
"utf-16le": ["utf-16le", "utf-16", "csunicode", "iso-10646-ucs-2", "ucs-2", "unicode", "unicodefeff"],
"x-user-defined": ["x-user-defined"],
"replacement": ["replacement"],
"big5": ["big5", "big5-hkscs", "cn-big5", "csbig5", "x-x-big5"],
"euc-jp": ["euc-jp", "cseucpkdfmtjapanese", "x-euc-jp"],
"iso-2022-jp": ["iso-2022-jp", "csiso2022jp"],
"shift_jis": ["shift_jis", "shift-jis", "csshiftjis", "ms932", "ms_kanji", "sjis", "windows-31j", "x-sjis"],
"euc-kr": [
"euc-kr",
"cseuckr",
"csksc56011987",
"iso-ir-149",
"korean",
"ks_c_5601-1987",
"ks_c_5601-1989",
"ksc5601",
"ksc_5601",
"windows-949",
],
"gbk": ["gbk", "chinese", "csgb2312", "csiso58gb231280", "gb2312", "gb_2312", "gb_2312-80", "iso-ir-58", "x-gbk"],
"gb18030": ["gb18030"],
};
for (const [canonical, labels] of Object.entries(encodingLabels)) {
for (const label of labels) {
describe(`${label} => ${canonical}`, () => {
test("exact label", () => {
const decoder = new TextDecoder(label);
expect(decoder.encoding).toBe(canonical);
});
test("uppercase label", () => {
const decoder = new TextDecoder(label.toUpperCase());
expect(decoder.encoding).toBe(canonical);
});
test("mixed case label", () => {
const mixedCase = label
.split("")
.map((c, i) => (i % 2 ? c.toUpperCase() : c))
.join("");
const decoder = new TextDecoder(mixedCase);
expect(decoder.encoding).toBe(canonical);
});
for (const ws of whitespace) {
test(`with leading whitespace '${ws === "\n" ? "\\n" : ws === "\r" ? "\\r" : ws === "\t" ? "\\t" : ws === "\f" ? "\\f" : ws}'`, () => {
const decoder = new TextDecoder(ws + label);
expect(decoder.encoding).toBe(canonical);
});
test(`with trailing whitespace '${ws === "\n" ? "\\n" : ws === "\r" ? "\\r" : ws === "\t" ? "\\t" : ws === "\f" ? "\\f" : ws}'`, () => {
const decoder = new TextDecoder(label + ws);
expect(decoder.encoding).toBe(canonical);
});
test(`with surrounding whitespace '${ws === "\n" ? "\\n" : ws === "\r" ? "\\r" : ws === "\t" ? "\\t" : ws === "\f" ? "\\f" : ws}'`, () => {
const decoder = new TextDecoder(ws + label + ws);
expect(decoder.encoding).toBe(canonical);
});
}
});
}
}
});
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