unfork DDC's copy of most SDK libraries

pkg/dev_compiler/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);
-}