Peter von der Ahé
4f2bdff90b
Change-Id: I1a3cc03fba9783807fa637a9d42fdbad68ee7686 Reviewed-on: https://dart-review.googlesource.com/31040 Commit-Queue: Peter von der Ahé <ahe@google.com> Reviewed-by: Kevin Millikin <kmillikin@google.com>
76 lines
2.2 KiB
Dart
76 lines
2.2 KiB
Dart
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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library kernel.round_trip;
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import 'dart:async';
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import 'dart:io';
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import 'package:kernel/binary/ast_from_binary.dart';
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import 'package:kernel/binary/ast_to_binary.dart';
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import 'package:kernel/kernel.dart';
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const String usage = '''
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Usage: round_trip.dart FILE.dill
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Deserialize and serialize the given component and check that the resulting byte
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sequence is identical to the original.
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''';
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void main(List<String> args) {
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if (args.length != 1) {
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print(usage);
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exit(1);
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}
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testRoundTrip(new File(args[0]).readAsBytesSync());
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}
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void testRoundTrip(List<int> bytes) {
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var component = new Component();
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new BinaryBuilder(bytes).readSingleFileComponent(component);
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new BinaryPrinterWithExpectedOutput(bytes).writeComponentFile(component);
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}
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class DummyStreamConsumer extends StreamConsumer<List<int>> {
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@override
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Future addStream(Stream<List<int>> stream) async => null;
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@override
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Future close() async => null;
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}
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/// Variant of the binary serializer that compares the output against an
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/// existing buffer.
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///
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/// As opposed to comparing binary files directly, when this fails, the stack
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/// trace shows what the serializer was doing when the output started to differ.
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class BinaryPrinterWithExpectedOutput extends BinaryPrinter {
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final List<int> expectedBytes;
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int offset = 0;
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static const int eof = -1;
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BinaryPrinterWithExpectedOutput(this.expectedBytes)
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: super(new IOSink(new DummyStreamConsumer()));
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String show(int byte) {
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if (byte == eof) return 'EOF';
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return '$byte (0x${byte.toRadixString(16).padLeft(2, "0")})';
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}
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@override
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void writeByte(int byte) {
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if (offset == expectedBytes.length || expectedBytes[offset] != byte) {
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int expected =
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(offset >= expectedBytes.length) ? eof : expectedBytes[offset];
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throw 'At offset $offset: '
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'Expected ${show(expected)} but found ${show(byte)}';
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}
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++offset;
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}
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@override
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void writeBytes(List<int> bytes) {
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bytes.forEach(writeByte);
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}
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}
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