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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// @dart = 2.9
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import "package:expect/expect.dart";
import 'dart:convert';
String decode(List<int> bytes, int chunkSize) {
StringBuffer buffer = new StringBuffer();
var stringSink = new StringConversionSink.fromStringSink(buffer);
var byteSink = new Utf8Decoder().startChunkedConversion(stringSink);
int i = 0;
while (i < bytes.length) {
var nextChunk = <int>[];
for (int j = 0; j < chunkSize; j++) {
if (i < bytes.length) {
nextChunk.add(bytes[i]);
i++;
}
}
byteSink.add(nextChunk);
}
byteSink.close();
return buffer.toString();
}
String decodeAllowMalformed(List<int> bytes, int chunkSize) {
StringBuffer buffer = new StringBuffer();
var stringSink = new StringConversionSink.fromStringSink(buffer);
var decoder = new Utf8Decoder(allowMalformed: true);
var byteSink = decoder.startChunkedConversion(stringSink);
int i = 0;
while (i < bytes.length) {
var nextChunk = <int>[];
for (int j = 0; j < chunkSize; j++) {
if (i < bytes.length) {
nextChunk.add(bytes[i]);
i++;
}
}
byteSink.add(nextChunk);
}
byteSink.close();
return buffer.toString();
}
main() {
// Test that chunked UTF8-decoder removes leading BOM.
Expect.equals("a", decode([0xEF, 0xBB, 0xBF, 0x61], 1));
Expect.equals("a", decode([0xEF, 0xBB, 0xBF, 0x61], 2));
Expect.equals("a", decode([0xEF, 0xBB, 0xBF, 0x61], 3));
Expect.equals("a", decode([0xEF, 0xBB, 0xBF, 0x61], 4));
Expect.equals("a", decodeAllowMalformed([0xEF, 0xBB, 0xBF, 0x61], 1));
Expect.equals("a", decodeAllowMalformed([0xEF, 0xBB, 0xBF, 0x61], 2));
Expect.equals("a", decodeAllowMalformed([0xEF, 0xBB, 0xBF, 0x61], 3));
Expect.equals("a", decodeAllowMalformed([0xEF, 0xBB, 0xBF, 0x61], 4));
Expect.equals("", decode([0xEF, 0xBB, 0xBF], 1));
Expect.equals("", decode([0xEF, 0xBB, 0xBF], 2));
Expect.equals("", decode([0xEF, 0xBB, 0xBF], 3));
Expect.equals("", decode([0xEF, 0xBB, 0xBF], 4));
Expect.equals("", decodeAllowMalformed([0xEF, 0xBB, 0xBF], 1));
Expect.equals("", decodeAllowMalformed([0xEF, 0xBB, 0xBF], 2));
Expect.equals("", decodeAllowMalformed([0xEF, 0xBB, 0xBF], 3));
Expect.equals("", decodeAllowMalformed([0xEF, 0xBB, 0xBF], 4));
Expect.equals("a\u{FEFF}", decode([0x61, 0xEF, 0xBB, 0xBF], 1));
Expect.equals("a\u{FEFF}", decode([0x61, 0xEF, 0xBB, 0xBF], 2));
Expect.equals("a\u{FEFF}", decode([0x61, 0xEF, 0xBB, 0xBF], 3));
Expect.equals("a\u{FEFF}", decode([0x61, 0xEF, 0xBB, 0xBF], 4));
Expect.equals("a\u{FEFF}", decodeAllowMalformed([0x61, 0xEF, 0xBB, 0xBF], 1));
Expect.equals("a\u{FEFF}", decodeAllowMalformed([0x61, 0xEF, 0xBB, 0xBF], 2));
Expect.equals("a\u{FEFF}", decodeAllowMalformed([0x61, 0xEF, 0xBB, 0xBF], 3));
Expect.equals("a\u{FEFF}", decodeAllowMalformed([0x61, 0xEF, 0xBB, 0xBF], 4));
}