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36 lines
1.1 KiB
36 lines
1.1 KiB
2 days ago
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// Helpers of the tests of the key of words: the words of a case of
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// test/vectors/wordkey_vectors.json, and the String of bytes that hold a
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// surrogate, as utf8Bytes writes one.
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import 'dart:typed_data';
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import 'package:datekeys/src/bytes.dart';
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/// The bytes of each hexadecimal word of [c].
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List<Uint8List> wordBytes(Map<String, Object?> c) => [
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for (final w in (c['words']! as List).cast<String>()) fromHex(w),
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];
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/// The String whose [utf8Bytes] are [b], also when they hold a surrogate,
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/// which utf8Bytes writes as the three bytes of its code point; null for
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/// other bytes that are not valid UTF-8.
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String? fromWtf8(Uint8List b) {
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final units = <int>[];
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for (var i = 0; i < b.length;) {
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if (b[i] == 0xed &&
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i + 2 < b.length &&
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b[i + 1] >= 0xa0 &&
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b[i + 1] <= 0xbf &&
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b[i + 2] & 0xc0 == 0x80) {
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units.add(0xd000 | (b[i + 1] & 0x3f) << 6 | b[i + 2] & 0x3f);
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i += 3;
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continue;
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}
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final (r, size) = decodeRune(b, i);
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if (size == 1 && b[i] >= 0x80) return null;
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units.addAll(String.fromCharCode(r).codeUnits);
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i += size;
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}
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return String.fromCharCodes(units);
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}
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