Update mojo sdk to rev 04a510fb37db10642e156957f9b2c11c2f6442ac

mojo/public/dart/src/codec.dart

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+part of bindings;
+
+const int kAlignment = 8;
+const int kArrayHeaderSize = 8;
+const int kStructHeaderSize = 8;
+const int kMessageHeaderSize = 16;
+const int kMessageWithRequestIDHeaderSize = 24;
+const int kMapStructPayloadSize = 16;
+const int kStructHeaderNumBytesOffset = 0;
+const int kStructHeaderNumFieldsOffset = 4;
+const int kEncodedInvalidHandleValue = 0xffffffff;
+const String kErrorUnsigned = "Passing negative value to unsigned encoder";
+
+
+int align(int size) => size + (kAlignment - (size % kAlignment)) % kAlignment;
+bool isAligned(offset) => (offset >= 0) && ((offset % kAlignment) == 0);
+
+
+Uint8List utf8OfString(String s) =>
+  (new Uint8List.fromList((const Utf8Encoder()).convert(s)));
+
+
+String stringOfUtf8(Uint8List bytes) =>
+    (const Utf8Decoder()).convert(bytes.toList());
+
+
+// Given an argument that is either a Type or an instance:
+// Invoke the static method "decode" of the Type, or the instance method
+// "decode" of the instance, on the MojoDecoder.
+Object _callDecode(Object typeOrInstance, MojoDecoder decoder) {
+  if (typeOrInstance is Type) {
+    return reflectClass(typeOrInstance).invoke(#decode, [decoder]).reflectee;
+  } else {
+    return typeOrInstance.decode(decoder);
+  }
+}
+
+
+// Given an argument that is either a Type or an instance:
+// Invoke the static method "encode" of the Type, or the instance method
+// "encode" of the instance, on the MojoEncoder and value to be encoded.
+void _callEncode(Object typeOrInstance, MojoEncoder encoder, Object val) {
+  if (typeOrInstance is Type) {
+    reflectClass(typeOrInstance).invoke(#encode, [encoder, val]);
+  } else {
+    typeOrInstance.encode(encoder, val);
+  }
+}
+
+
+// Given an argument that is either a Type or an instance:
+// Invoke the static getter "encodedSize" of the Type, or the instance getter
+// "encodedSize" of the instance, and return the result.
+int getEncodedSize(Object typeOrInstance) {
+  if (typeOrInstance is Type) {
+    return reflectClass(typeOrInstance).getField(#encodedSize).reflectee;
+  } else {
+    return typeOrInstance.encodedSize;
+  }
+}
+
+
+class MojoDecoder {
+  ByteData buffer;
+  List<int> handles;
+  int base;
+  int next;
+
+  MojoDecoder(this.buffer, this.handles, this.base) {
+    next = base;
+  }
+
+  void skip(int offset) {
+    next += offset;
+  }
+
+  int readInt8() {
+    int result = buffer.getInt8(next);
+    next += 1;
+    return result;
+  }
+
+  int readUint8() {
+    int result = buffer.getUint8(next);
+    next += 1;
+    return result;
+  }
+
+  int readInt16() {
+    int result = buffer.getInt16(next, Endianness.LITTLE_ENDIAN);
+    next += 2;
+    return result;
+  }
+
+  int readUint16() {
+    int result = buffer.getUint16(next, Endianness.LITTLE_ENDIAN);
+    next += 2;
+    return result;
+  }
+
+  int readInt32() {
+    int result = buffer.getInt32(next, Endianness.LITTLE_ENDIAN);
+    next += 4;
+    return result;
+  }
+
+  int readUint32() {
+    int result = buffer.getUint32(next, Endianness.LITTLE_ENDIAN);
+    next += 4;
+    return result;
+  }
+
+  int readInt64() {
+    int result = buffer.getInt64(next, Endianness.LITTLE_ENDIAN);
+    next += 8;
+    return result;
+  }
+
+  int readUint64() {
+    int result = buffer.getUint64(next, Endianness.LITTLE_ENDIAN);
+    next += 8;
+    return result;
+  }
+
+  double readFloat() {
+    double result = buffer.getFloat32(next,Endianness.LITTLE_ENDIAN);
+    next += 4;
+    return result;
+  }
+
+  double readDouble() {
+    double result = buffer.getFloat64(next, Endianness.LITTLE_ENDIAN);
+    next += 8;
+    return result;
+  }
+
+  int decodePointer() {
+    int offsetPointer = next;
+    int offset = readUint64();
+    if (offset == 0) {
+      return 0;
+    }
+    return offsetPointer + offset;
+  }
+
+  MojoDecoder decodeAndCreateDecoder(int offset) {
+    return new MojoDecoder(buffer, handles, offset);
+  }
+
+  int decodeHandle() {
+    return handles[readUint32()];
+  }
+
+  String decodeString() {
+    int numBytes = readUint32();
+    int numElements = readUint32();
+    int base = next;
+    next += numElements;
+    return stringOfUtf8(buffer.buffer.asUint8List(base, numElements));
+  }
+
+  List decodeArray(Object type) {
+    int numBytes = readUint32();
+    int numElements = readUint32();
+    if (type == PackedBool) {
+      int b;
+      List<bool> result = new List<bool>(numElements);
+      for (int i = 0; i < numElements; i++) {
+        if ((i % 8) == 0) {
+          b = readUint8();
+        }
+        result[i] = ((b & (1 << (i % 8)) != 0) ? true : false);
+      }
+      return result;
+    } else {
+      List result = new List(numElements);
+      for (int i = 0; i < numElements; i++) {
+        result[i] = _callDecode(type, this);
+      }
+      return result;
+    }
+  }
+
+  Object decodeStruct(Object t) {
+    return _callDecode(t, this);
+  }
+
+  Object decodeStructPointer(Object t) {
+    int pointer = decodePointer();
+    if (pointer == 0) {
+      return null;
+    }
+    return _callDecode(t, decodeAndCreateDecoder(pointer));
+  }
+
+  List decodeArrayPointer(Object type) {
+    int pointer = decodePointer();
+    if (pointer == 0) {
+      return null;
+    }
+    return decodeAndCreateDecoder(pointer).decodeArray(type);
+  }
+
+  String decodeStringPointer() {
+    int pointer = decodePointer();
+    if (pointer == 0) {
+      return null;
+    }
+    return decodeAndCreateDecoder(pointer).decodeString();
+  }
+
+  Map decodeMap(Object keyType, Object valType) {
+    skip(4);  // number of bytes.
+    skip(4);  // number of fields.
+    List keys = decodeArrayPointer(keyType);
+    List values = decodeArrayPointer(valType);
+    return new Map.fromIterables(keys, values);
+  }
+
+  Map decodeMapPointer(Object keyType, Object valType) {
+    int pointer = this.decodePointer();
+    if (pointer == 0) {
+      return null;
+    }
+    MojoDecoder decoder = decodeAndCreateDecoder(pointer);
+    return decoder.decodeMap(keyType, valType);
+  }
+}
+
+
+class MojoEncoder {
+  ByteData buffer;
+  List<int> handles;
+  int base;
+  int next;
+  int extent;
+
+  MojoEncoder(this.buffer, this.handles, this.base, this.extent) {
+    next = base;
+  }
+
+  void skip(int offset) {
+    next += offset;
+  }
+
+  void writeInt8(int val) {
+    buffer.setInt8(next, val);
+    next += 1;
+  }
+
+  void writeUint8(int val) {
+    if (val < 0) {
+      throw new ArgumentError("$kErrorUnsigned: $val");
+    }
+    buffer.setUint8(next, val);
+    next += 1;
+  }
+
+  void writeInt16(int val) {
+    buffer.setInt16(next, val, Endianness.LITTLE_ENDIAN);
+    next += 2;
+  }
+
+  void writeUint16(int val) {
+    if (val < 0) {
+      throw new ArgumentError("$kErrorUnsigned: $val");
+    }
+    buffer.setUint16(next, val, Endianness.LITTLE_ENDIAN);
+    next += 2;
+  }
+
+  void writeInt32(int val) {
+    buffer.setInt32(next, val, Endianness.LITTLE_ENDIAN);
+    next += 4;
+  }
+
+  void writeUint32(int val) {
+    if (val < 0) {
+      throw new ArgumentError("$kErrorUnsigned: $val");
+    }
+    buffer.setUint32(next, val, Endianness.LITTLE_ENDIAN);
+    next += 4;
+  }
+
+  void writeInt64(int val) {
+    buffer.setInt64(next, val, Endianness.LITTLE_ENDIAN);
+    next += 8;
+  }
+
+  void writeUint64(int val) {
+    if (val < 0) {
+      throw new ArgumentError("$kErrorUnsigned: $val");
+    }
+    buffer.setUint64(next, val, Endianness.LITTLE_ENDIAN);
+    next += 8;
+  }
+
+  void writeFloat(double val) {
+    buffer.setFloat32(next, val, Endianness.LITTLE_ENDIAN);
+    next += 4;
+  }
+
+  void writeDouble(double val) {
+    buffer.setFloat64(next, val, Endianness.LITTLE_ENDIAN);
+    next += 8;
+  }
+
+  void encodePointer(int pointer) {
+    if (pointer == null) {
+      writeUint64(0);
+      return;
+    }
+    int offset = pointer - next;
+    writeUint64(offset);
+  }
+
+  void grow(int new_size) {
+    Uint8List new_buffer = new Uint8List(new_size);
+    new_buffer.setRange(0, next, buffer.buffer.asUint8List());
+    buffer = new_buffer.buffer.asByteData();
+  }
+
+  int alloc(int size_request) {
+    int pointer = extent;
+    extent += size_request;
+    if (extent > buffer.lengthInBytes) {
+      int new_size = buffer.lengthInBytes + size_request;
+      new_size += new_size ~/ 2;
+      grow(new_size);
+    }
+    return pointer;
+  }
+
+  MojoEncoder createAndEncodeEncoder(int size) {
+    int pointer = alloc(align(size));
+    encodePointer(pointer);
+    return new MojoEncoder(buffer, handles, pointer, extent);
+  }
+
+  void encodeHandle(int handle) {
+    handles.add(handle);
+    writeUint32(handles.length - 1);
+  }
+
+  void encodeString(String val) {
+    Uint8List utf8string = utf8OfString(val);
+    int numElements = utf8string.lengthInBytes;
+    int numBytes = kArrayHeaderSize + numElements;
+    writeUint32(numBytes);
+    writeUint32(numElements);
+    buffer.buffer.asUint8List().setRange(next, next + numElements, utf8string);
+    next += numElements;
+  }
+
+  void encodeArray(Object t, List val, [int numElements, int encodedSize]) {
+    if (numElements == null) {
+      numElements = val.length;
+    }
+    if (encodedSize == null) {
+      encodedSize = kArrayHeaderSize + (getEncodedSize(t) * numElements);
+    }
+
+    writeUint32(encodedSize);
+    writeUint32(numElements);
+
+    if (t == PackedBool) {
+      int b = 0;
+      for (int i = 0; i < numElements; i++) {
+        if (val[i]) {
+          b |= (1 << (i % 8));
+        }
+        if (((i % 8) == 7) || (i == (numElements - 1))) {
+          Uint8.encode(this, b);
+        }
+      }
+    } else {
+      for (int i = 0; i < numElements; i++) {
+        _callEncode(t, this, val[i]);
+      }
+    }
+  }
+
+  void encodeStruct(Object t, Object val) {
+    _callEncode(t, this, val);
+  }
+
+  void encodeStructPointer(Object t, Object val) {
+    if (val == null) {
+      encodePointer(val);
+      return;
+    }
+    MojoEncoder encoder = createAndEncodeEncoder(getEncodedSize(t));
+    _callEncode(t, encoder, val);
+    extent = encoder.extent;
+    buffer = encoder.buffer;
+  }
+
+  void encodeArrayPointer(Object t, List val) {
+    if (val == null) {
+      encodePointer(val);
+      return;
+    }
+    int numElements = val.length;
+    int encodedSize = kArrayHeaderSize + ((t == PackedBool) ?
+        (numElements / 8).ceil() : (getEncodedSize(t) * numElements));
+    MojoEncoder encoder = createAndEncodeEncoder(encodedSize);
+    encoder.encodeArray(t, val, numElements, encodedSize);
+    extent = encoder.extent;
+    buffer = encoder.buffer;
+  }
+
+  void encodeStringPointer(String val) {
+    if (val == null) {
+      encodePointer(val);
+      return;
+    }
+    int encodedSize = kArrayHeaderSize + utf8OfString(val).lengthInBytes;
+    MojoEncoder encoder = createAndEncodeEncoder(encodedSize);
+    encoder.encodeString(val);
+    extent = encoder.extent;
+    buffer = encoder.buffer;
+  }
+
+  void encodeMap(Object keyType, Object valType, Map val) {
+    List keys = val.keys;
+    List vals = val.values;
+    writeUint32(kStructHeaderSize + kMapStructPayloadSize);
+    writeUint32(2);
+    encodeArrayPointer(keyType, keys);
+    encodeArrayPointer(valType, vals);
+  }
+
+  void encodeMapPointer(Object keyTYpe, Object valType, Map val) {
+    if (val == null) {
+      encodePointer(val);
+      return;
+    }
+    int encodedSize = kStructHeaderSize + kMapStructPayloadSize;
+    MojoEncoder encoder = createAndEncodeEncoder(encodedSize);
+    encoder.encodeMap(keyType, valType, val);
+    extent = encoder.extent;
+    buffer = encoder.buffer;
+  }
+}
+
+
+const int kMessageNameOffset = kStructHeaderSize;
+const int kMessageFlagsOffset = kMessageNameOffset + 4;
+const int kMessageRequestIDOffset = kMessageFlagsOffset + 4;
+const int kMessageExpectsResponse = 1 << 0;
+const int kMessageIsResponse = 1 << 1;
+
+class Message {
+  ByteData buffer;
+  List<int> handles;
+
+  Message(this.buffer, this.handles);
+
+  int getHeaderNumBytes() => buffer.getUint32(kStructHeaderNumBytesOffset);
+  int getHeaderNumFields() => buffer.getUint32(kStructHeaderNumFieldsOffset);
+  int getName() => buffer.getUint32(kMessageNameOffset);
+  int getFlags() => buffer.getUint32(kMessageFlagsOffset);
+  bool isResponse() => (getFlags() & kMessageIsResponse) != 0;
+  bool expectsResponse() => (getFlags() & kMessageExpectsResponse) != 0;
+
+  void setRequestID(int id) {
+    buffer.setUint64(kMessageRequestIDOffset, id);
+  }
+}
+
+
+class MessageBuilder {
+  MojoEncoder encoder;
+  List<int> handles;
+
+  MessageBuilder(int name, int payloadSize) {
+    int numBytes = kMessageHeaderSize + payloadSize;
+    var buffer = new ByteData(numBytes);
+    handles = [];
+
+    encoder = new MojoEncoder(buffer, handles, 0, kMessageHeaderSize);
+    encoder.writeUint32(kMessageHeaderSize);
+    encoder.writeUint32(2);  // num_fields;
+    encoder.writeUint32(name);
+    encoder.writeUint32(0);  // flags.
+  }
+
+  MojoEncoder createEncoder(int size) {
+    encoder = new MojoEncoder(encoder.buffer,
+                              handles,
+                              encoder.next,
+                              encoder.next + size);
+    return encoder;
+  }
+
+  void encodeStruct(Object t, Object val) {
+    encoder = createEncoder(getEncodedSize(t));
+    _callEncode(t, encoder, val);
+  }
+
+  ByteData _trimBuffer() {
+    return new ByteData.view(encoder.buffer.buffer, 0, encoder.extent);
+  }
+
+  Message finish() {
+    Message message = new Message(_trimBuffer(), handles);
+    encoder = null;
+    handles = null;
+    return message;
+  }
+}
+
+
+class MessageWithRequestIDBuilder extends MessageBuilder {
+  MessageWithRequestIDBuilder(
+      int name, int payloadSize, int flags, int requestID) {
+    int numBytes = kMessageWithRequestIDHeaderSize + payloadSize;
+    buffer = new ByteData(numBytes);
+    handles = [];
+    base = 0;
+
+    encoder = createEncoder(0, kMessageWithRequestIDHeaderSize);
+    encoder.writeUint32(kMessageWithRequestIDHeaderSize);
+    encoder.writeUint32(3);  // num_fields.
+    encoder.writeUint32(name);
+    encoder.writeUint32(flags);
+    encoder.writeUint64(requestID);
+    base = encoder.next;
+    buffer = encoder.buffer;
+  }
+}
+
+
+class MessageReader {
+  MojoDecoder decoder;
+  int payloadSize;
+  int name;
+  int flags;
+  int requestID;
+
+  MessageReader(Message message) {
+    decoder = new MojoDecoder(message.buffer, message.handles, 0);
+
+    int messageHeaderSize = decoder.readUint32();
+    payloadSize = message.buffer.lengthInBytes - messageHeaderSize;
+
+    int num_fields = decoder.readUint32();
+    name = decoder.readUint32();
+    flags = decoder.readUint32();
+
+    if (num_fields >= 3) {
+      requestID = decoder.readUint64();
+    }
+    decoder.skip(messageHeaderSize - decoder.next);
+  }
+
+  Object decodeStruct(Object t) => _callDecode(t, decoder);
+}
+
+
+abstract class MojoType<T> {
+  static const int encodedSize = 0;
+  static T decode(MojoDecoder decoder) { return null }
+  static void encode(MojoEncoder encoder, T val) {}
+}
+
+
+class PackedBool {}
+
+
+class Int8 implements MojoType<int> {
+  static const int encodedSize = 1;
+  static int decode(MojoDecoder decoder) => decoder.readInt8();
+  static void encode(MojoEncoder encoder, int val) {
+    encoder.writeInt8(val);
+  }
+}
+
+
+class Uint8 implements MojoType<int> {
+  static const int encodedSize = 1;
+  static int decode(MojoDecoder decoder) => decoder.readUint8();
+  static void encode(MojoEncoder encoder, int val) {
+    encoder.writeUint8(val);
+  }
+}
+
+
+class Int16 implements MojoType<int> {
+  static const int encodedSize = 2;
+  static int decode(MojoDecoder decoder) => decoder.readInt16();
+  static void encode(MojoEncoder encoder, int val) {
+    encoder.writeInt16(val);
+  }
+}
+
+
+class Uint16 implements MojoType<int> {
+  static const int encodedSize = 2;
+  static int decode(MojoDecoder decoder) => decoder.readUint16();
+  static void encode(MojoEncoder encoder, int val) {
+    encoder.writeUint16(val);
+  }
+}
+
+
+class Int32 implements MojoType<int> {
+  static const int encodedSize = 4;
+  static int decode(MojoDecoder decoder) => decoder.readInt32();
+  static void encode(MojoEncoder encoder, int val) {
+    encoder.writeInt32(val);
+  }
+}
+
+
+class Uint32 implements MojoType<int> {
+  static const int encodedSize = 4;
+  static int decode(MojoDecoder decoder) => decoder.readUint32();
+  static void encode(MojoEncoder encoder, int val) {
+    encoder.writeUint32(val);
+  }
+}
+
+
+class Int64 implements MojoType<int> {
+  static const int encodedSize = 8;
+  static int decode(MojoDecoder decoder) => decoder.readInt64();
+  static void encode(MojoEncoder encoder, int val) {
+    encoder.writeInt64(val);
+  }
+}
+
+
+class Uint64 implements MojoType<int> {
+  static const int encodedSize = 8;
+  static int decode(MojoDecoder decoder) => decoder.readUint64();
+  static void encode(MojoEncoder encoder, int val) {
+    encoder.writeUint64(val);
+  }
+}
+
+
+class MojoString implements MojoType<String> {
+  static const int encodedSize = 8;
+  static String decode(MojoDecoder decoder) => decoder.decodeStringPointer();
+  static void encode(MojoEncoder encoder, String val) {
+    encoder.encodeStringPointer(val);
+  }
+}
+
+
+class NullableMojoString implements MojoType<String> {
+  static const int encodedSize = MojoString.encodedSize;
+  static var decode = MojoString.decode;
+  static var encode = MojoString.encode;
+}
+
+
+class Float implements MojoType<double> {
+  static const int encodedSize = 4;
+  static double decode(MojoDecoder decoder) => decoder.readFloat();
+  static void encode(MojoEncoder encoder, double val) {
+    encoder.writeFloat(val);
+  }
+}
+
+
+class Double implements MojoType<double> {
+  static const int encodedSize = 8;
+  static double decode(MojoDecoder decoder) => decoder.readDouble();
+  static void encode(MojoEncoder encoder, double val) {
+    encoder.writeDouble(val);
+  }
+}
+
+
+class PointerTo {
+  Object val;
+
+  PointerTo(this.val);
+
+  int encodedSize = 8;
+  Object decode(MojoDecoder decoder) {
+    int pointer = decoder.decodePointer();
+    if (pointer == 0) {
+      return null;
+    }
+    return _callDecode(val, decoder.decodeAndCreateDecoder(pointer));
+  }
+  void encode(MojoEncoder encoder, Object val) {
+    if (val == null) {
+      encoder.encodePointer(val);
+      return;
+    }
+    MojoEncoder obj_encoder =
+        encoder.createAndEncodeEncoder(getEncodedSize(this.val));
+    _callEncode(this.val, obj_encoder, val);
+  }
+}
+
+
+class NullablePointerTo extends PointerTo {
+  static const int encodedSize = PointerTo.encodedSize;
+}
+
+
+class ArrayOf {
+  Object val;
+  int length;
+
+  ArrayOf(this.val, [this.length = 0]);
+
+  int dimensions() => [length].addAll((val is ArrayOf) ? val.dimensions() : []);
+
+  int encodedSize = 8;
+  List decode(MojoDecoder decoder) => decoder.decodeArrayPointer(val);
+  void encode(MojoEncoder encoder, List val) {
+    encoder.encodeArrayPointer(this.val, val);
+  }
+}
+
+
+class NullableArrayOf extends ArrayOf {
+  static const int encodedSize = ArrayOf.encodedSize;
+}
+
+
+class Handle implements MojoType<int> {
+  static const int encodedSize = 4;
+  static int decode(MojoDecoder decoder) => decoder.decodeHandle();
+  static void encode(MojoEncoder encoder, int val) {
+    encoder.encodeHandle(val);
+  }
+}
+
+
+class NullableHandle implements MojoType<int> {
+  static const int encodedSize = Handle.encodedSize;
+  static const decode = Handle.decode;
+  static const encode = Handle.encode;
+}