| // 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) { |
| return response is List && response[0] != _SUCCESS_RESPONSE; |
| } |
| |
| /** |
| * Returns an Exception or an Error |
| */ |
| _exceptionFromResponse(response, String message) { |
| 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 FileIOException(message, err); |
| case _FILE_CLOSED_RESPONSE: |
| return new FileIOException("File closed"); |
| default: |
| return new Exception("Unknown error"); |
| } |
| } |
| |
| /** |
| * An [OSError] object holds information about an error from the |
| * operating system. |
| */ |
| class OSError implements Error { |
| /** Constant used to indicate that no OS error code is available. */ |
| static const int noErrorCode = -1; |
| |
| /** Creates an OSError object from a message and an errorCode. */ |
| const OSError([String this.message = "", int 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(": "); |
| sb.write(message); |
| if (errorCode != noErrorCode) { |
| sb.write(", errno = "); |
| sb.write(errorCode.toString()); |
| } |
| } else if (errorCode != noErrorCode) { |
| sb.write(": errno = "); |
| sb.write(errorCode.toString()); |
| } |
| return sb.toString(); |
| } |
| |
| /** |
| * 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; |
| } |
| |
| |
| // Object for holding a buffer and an offset. |
| class _BufferAndStart { |
| _BufferAndStart(List this.buffer, int this.start); |
| List buffer; |
| int start; |
| } |
| |
| // Ensure that the input List can be serialized through a native port. |
| // Only builtin Lists can be serialized through. If user-defined Lists |
| // get here, the contents is copied to a Uint8List. This has the added |
| // benefit that it is faster to access from the C code as well. |
| _BufferAndStart _ensureFastAndSerializableBuffer( |
| List buffer, int start, int end) { |
| if (buffer is Uint8List || |
| buffer is Int8List || |
| buffer is Uint16List || |
| buffer is Int16List || |
| buffer is Uint32List || |
| buffer is Int32List || |
| buffer is Uint64List || |
| buffer is Int64List || |
| buffer is ByteData || |
| buffer is Float32List || |
| buffer is Float64List || |
| _BufferUtils._isBuiltinList(buffer)) { |
| 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); |
| } |
| |
| |
| // TODO(ager): The only reason for the class here is that |
| // we cannot patch a top-level function. |
| class _BufferUtils { |
| // Check if a List is a builtin VM List type. Returns true |
| // if the List is a builtin VM List type and false if it is |
| // a user defined List type. |
| external static bool _isBuiltinList(List buffer); |
| } |
| |
| class _IOCrypto { |
| external static Uint8List getRandomBytes(int count); |
| } |