Migrate dart2js stubs for dart:io

tool/input_sdk/lib/io/common.dart

+// 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.
+
+part of dart.io;
+
+// Constants used when working with native ports.
+// These must match the constants in runtime/bin/dartutils.h class CObject.
+const int _SUCCESS_RESPONSE = 0;
+const int _ILLEGAL_ARGUMENT_RESPONSE = 1;
+const int _OSERROR_RESPONSE = 2;
+const int _FILE_CLOSED_RESPONSE = 3;
+
+const int _ERROR_RESPONSE_ERROR_TYPE = 0;
+const int _OSERROR_RESPONSE_ERROR_CODE = 1;
+const int _OSERROR_RESPONSE_MESSAGE = 2;
+
+// Functions used to receive exceptions from native ports.
+bool _isErrorResponse(response) =>
+    response is List && response[0] != _SUCCESS_RESPONSE;
+
+/**
+ * Returns an Exception or an Error
+ */
+_exceptionFromResponse(response, String message, String path) {
+  assert(_isErrorResponse(response));
+  switch (response[_ERROR_RESPONSE_ERROR_TYPE]) {
+    case _ILLEGAL_ARGUMENT_RESPONSE:
+      return new ArgumentError();
+    case _OSERROR_RESPONSE:
+      var err = new OSError(response[_OSERROR_RESPONSE_MESSAGE],
+                            response[_OSERROR_RESPONSE_ERROR_CODE]);
+      return new FileSystemException(message, path, err);
+    case _FILE_CLOSED_RESPONSE:
+      return new FileSystemException("File closed", path);
+    default:
+      return new Exception("Unknown error");
+  }
+}
+
+/**
+ * Base class for all IO related exceptions.
+ */
+abstract class IOException implements Exception {
+  String toString() => "IOException";
+}
+
+/**
+  * An [OSError] object holds information about an error from the
+  * operating system.
+  */
+class OSError {
+  /** Constant used to indicate that no OS error code is available. */
+  static const int noErrorCode = -1;
+
+  /**
+    * Error message supplied by the operating system. null if no message is
+    * associated with the error.
+    */
+  final String message;
+
+  /**
+    * Error code supplied by the operating system. Will have the value
+    * [noErrorCode] if there is no error code associated with the error.
+    */
+  final int errorCode;
+
+  /** Creates an OSError object from a message and an errorCode. */
+  const OSError([this.message = "", this.errorCode = noErrorCode]);
+
+  /** Converts an OSError object to a string representation. */
+  String toString() {
+    StringBuffer sb = new StringBuffer();
+    sb.write("OS Error");
+    if (!message.isEmpty) {
+      sb..write(": ")
+        ..write(message);
+      if (errorCode != noErrorCode) {
+        sb..write(", errno = ")
+          ..write(errorCode.toString());
+      }
+    } else if (errorCode != noErrorCode) {
+      sb..write(": errno = ")
+        ..write(errorCode.toString());
+    }
+    return sb.toString();
+  }
+}
+
+
+// Object for holding a buffer and an offset.
+class _BufferAndStart {
+  List buffer;
+  int start;
+  _BufferAndStart(this.buffer, this.start);
+}
+
+// Ensure that the input List can be serialized through a native port.
+// Only Int8List and Uint8List Lists are serialized directly.
+// All other lists are first copied into a Uint8List. This has the added
+// benefit that it is faster to access from the C code as well.
+_BufferAndStart _ensureFastAndSerializableByteData(
+    List buffer, int start, int end) {
+  if (buffer is Uint8List || buffer is Int8List) {
+    return new _BufferAndStart(buffer, start);
+  }
+  int length = end - start;
+  var newBuffer = new Uint8List(length);
+  int j = start;
+  for (int i = 0; i < length; i++) {
+    int value = buffer[j];
+    if (value is! int) {
+      throw new ArgumentError("List element is not an integer at index $j");
+    }
+    newBuffer[i] = value;
+    j++;
+  }
+  return new _BufferAndStart(newBuffer, 0);
+}
+
+
+class _IOCrypto {
+  external static Uint8List getRandomBytes(int count);
+}