[gjs/ewlsh/text-encoding: 4/5] modules: Implement single byte encodings

From: Evan Welsh <ewlsh src gnome org>
To: commits-list gnome org
Cc:
Subject: [gjs/ewlsh/text-encoding: 4/5] modules: Implement single byte encodings
Date: Mon, 5 Jul 2021 05:24:27 +0000 (UTC)

commit 8482a146901897769033fd6fea87abd2b83a473c
Author: Evan Welsh <contact evanwelsh com>
Date:   Sun Jul 4 22:17:46 2021 -0700

    modules: Implement single byte encodings

 js.gresource.xml                     |  1 +
 modules/core/_singleByteEncodings.js | 40 ++++++++++++++++++++++++++++++++++++
 modules/core/_text.js                | 39 +++++++++++++++++++++++++++++++++++
 3 files changed, 80 insertions(+)
---
diff --git a/js.gresource.xml b/js.gresource.xml
index a0b37730..fc64a8f6 100644
--- a/js.gresource.xml
+++ b/js.gresource.xml
@@ -43,6 +43,7 @@
     <file>modules/core/_cairo.js</file>
     <file>modules/core/_common.js</file>
     <file>modules/core/_encodings.js</file>
+    <file>modules/core/_singleByteEncodings.js</file>
     <file>modules/core/_format.js</file>
     <file>modules/core/_gettext.js</file>
     <file>modules/core/_signals.js</file>
diff --git a/modules/core/_singleByteEncodings.js b/modules/core/_singleByteEncodings.js
new file mode 100644
index 00000000..af7fdebf
--- /dev/null
+++ b/modules/core/_singleByteEncodings.js
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// SPDX-FileCopyrightText: WHATWG (Apple, Google, Mozilla, Microsoft)
+
+/* exported singleByteEncodings */
+
+// These single byte encodings are considered "legacy" and have inconsistent implementations
+// by platform. The WHATWG Encoding specification standardizes a set of encodings and
+// their character mapping to UTF-8.
+
+// Derived from https://encoding.spec.whatwg.org/#legacy-single-byte-encodings
+
+var singleByteEncodings = {
+    '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-8859-2': [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, 260, 728, 321, 164, 317, 346, 167, 
168, 352, 350, 356, 377, 173, 381, 379, 176, 261, 731, 322, 180, 318, 347, 711, 184, 353, 351, 357, 378, 733, 
382, 380, 340, 193, 194, 258, 196, 313, 262, 199, 268, 201, 280, 203, 282, 205, 206, 270, 272, 323, 327, 211, 
212, 336, 214, 215, 344, 366, 218, 368, 220, 221, 354, 223, 341, 225, 226, 259, 228, 314, 263, 231, 269, 233, 
281, 235, 283, 237, 238, 271, 273, 324, 328, 243, 244, 337, 246, 247, 345, 367, 250, 369, 252, 253, 355, 729],
+    '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-8859-4': [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, 260, 312, 342, 164, 296, 315, 167, 
168, 352, 274, 290, 358, 173, 381, 175, 176, 261, 731, 343, 180, 297, 316, 711, 184, 353, 275, 291, 359, 330, 
382, 331, 256, 193, 194, 195, 196, 197, 198, 302, 268, 201, 280, 203, 278, 205, 206, 298, 272, 325, 332, 310, 
212, 213, 214, 215, 216, 370, 218, 219, 220, 360, 362, 223, 257, 225, 226, 227, 228, 229, 230, 303, 269, 233, 
281, 235, 279, 237, 238, 299, 273, 326, 333, 311, 244, 245, 246, 247, 248, 371, 250, 251, 252, 361, 363, 729],
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1066, 1067, 1068, 1069, 1070, 1071, 1072, 1073, 1074, 1075, 1076, 1077, 1078, 1079, 1080, 1081, 1082, 1083, 
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1102, 1103, 8470, 1105, 1106, 1107, 1108, 1109, 1110, 1111, 1112, 1113, 1114, 1115, 1116, 167, 1118, 1119],
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1615, 1616, 1617, 1618, null, null, null, null, null, null, null, null, null, null, null, null, null],
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973, 974, null],
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254, 312],
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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, 8217],
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7787, 248, 249, 250, 251, 252, 253, 375, 255],
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254, 255],
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281, 539, 255],
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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-1256': [8364, 1662, 8218, 402, 8222, 8230, 8224, 8225, 710, 8240, 1657, 8249, 338, 1670, 1688, 
1672, 1711, 8216, 8217, 8220, 8221, 8226, 8211, 8212, 1705, 8482, 1681, 8250, 339, 8204, 8205, 1722, 160, 
1548, 162, 163, 164, 165, 166, 167, 168, 169, 1726, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 
182, 183, 184, 185, 1563, 187, 188, 189, 190, 1567, 1729, 1569, 1570, 1571, 1572, 1573, 1574, 1575, 1576, 
1577, 1578, 1579, 1580, 1581, 1582, 1583, 1584, 1585, 1586, 1587, 1588, 1589, 1590, 215, 1591, 1592, 1593, 
1594, 1600, 1601, 1602, 1603, 224, 1604, 226, 1605, 1606, 1607, 1608, 231, 232, 233, 234, 235, 1609, 1610, 
238, 239, 1611, 1612, 1613, 1614, 244, 1615, 1616, 247, 1617, 249, 1618, 251, 252, 8206, 8207, 1746],
+    '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],
+    'windows-1258': [8364, 129, 8218, 402, 8222, 8230, 8224, 8225, 710, 8240, 138, 8249, 338, 141, 142, 143, 
144, 8216, 8217, 8220, 8221, 8226, 8211, 8212, 732, 8482, 154, 8250, 339, 157, 158, 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, 258, 196, 197, 198, 199, 200, 201, 202, 203, 768, 205, 206, 207, 
272, 209, 777, 211, 212, 416, 214, 215, 216, 217, 218, 219, 220, 431, 771, 223, 224, 225, 226, 259, 228, 229, 
230, 231, 232, 233, 234, 235, 769, 237, 238, 239, 273, 241, 803, 243, 244, 417, 246, 247, 248, 249, 250, 251, 
252, 432, 8363, 255],
+    'x-mac-cyrillic': [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, 
8224, 176, 1168, 163, 167, 8226, 182, 1030, 174, 169, 8482, 1026, 1106, 8800, 1027, 1107, 8734, 177, 8804, 
8805, 1110, 181, 1169, 1032, 1028, 1108, 1031, 1111, 1033, 1113, 1034, 1114, 1112, 1029, 172, 8730, 402, 
8776, 8710, 171, 187, 8230, 160, 1035, 1115, 1036, 1116, 1109, 8211, 8212, 8220, 8221, 8216, 8217, 247, 8222, 
1038, 1118, 1039, 1119, 8470, 1025, 1105, 1103, 1072, 1073, 1074, 1075, 1076, 1077, 1078, 1079, 1080, 1081, 
1082, 1083, 1084, 1085, 1086, 1087, 1088, 1089, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098, 1099, 
1100, 1101, 1102, 8364],
+};
diff --git a/modules/core/_text.js b/modules/core/_text.js
index e3cefb90..95ad2645 100644
--- a/modules/core/_text.js
+++ b/modules/core/_text.js
@@ -4,6 +4,39 @@
 const Encoding = imports._encodingNative;
 
 const { getEncodingFromLabel } = imports._encodings;
+const { singleByteEncodings } = imports._singleByteEncodings;
+
+/**
+ * @param {number[]} encoding 
+ * @param {number} byte
+ * @param {boolean} fatal
+ * @returns {number}
+ */
+const decodeSingleByteEncodingCharacter = (encoding, byte, fatal) => {
+    if (byte < 0x80) {
+        return byte;
+    } else {
+        if (encoding[byte - 0x80] == null && fatal) {
+            throw new TypeError(`Invalid character in decode.`);
+        }
+        return encoding[byte - 0x80] ?? 0xFFFD;
+    }
+}
+
+/**
+ * @param {number[]} encoding
+ * @param {Uint8Array} bytes 
+ * @param {boolean} fatal
+ * @returns {string}
+ */
+const decodeSingleByteEncoding = (encoding, bytes, fatal) => {
+    const decoded = [...bytes.values()].map(byte => decodeSingleByteEncodingCharacter(encoding, byte, 
fatal));
+
+    return String.fromCodePoint(...decoded);
+};
+
+const isSingleByteEncoding = (label) => label in singleByteEncodings;
+const getSingleByteEncoding = (label) => singleByteEncodings[label];
 
 var TextDecoder = class TextDecoder {
     /**  
@@ -125,6 +158,12 @@ var TextDecoder = class TextDecoder {
             input = new Uint8Array(buffer, byteOffset + 3, byteLength - 3);
         }
 
+        if (isSingleByteEncoding(this._internalEncoding)) {
+            const encoding = getSingleByteEncoding(this._internalEncoding);
+
+            return decodeSingleByteEncoding(encoding, input, this.fatal);
+        }
+
         return Encoding.decode(input, this._internalEncoding, this.fatal);
     }
 }
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