Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/csharp/src/Google.Protobuf.Conformance/Program.cs

-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2015 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using Conformance;
-using System;
-using System.IO;
-
-namespace Google.Protobuf.Conformance
-{
-    /// <summary>
-    /// Conformance tests. The test runner will provide JSON or proto data on stdin,
-    /// and this program will produce its output on stdout.
-    /// </summary>
-    class Program
-    {
-        private static void Main(string[] args)
-        {
-            // This way we get the binary streams instead of readers/writers.
-            var input = new BinaryReader(Console.OpenStandardInput());
-            var output = new BinaryWriter(Console.OpenStandardOutput());
-
-            int count = 0;
-            while (RunTest(input, output))
-            {
-                count++;
-            }
-            Console.Error.WriteLine("Received EOF after {0} tests", count);
-        }
-
-        private static bool RunTest(BinaryReader input, BinaryWriter output)
-        {
-            int? size = ReadInt32(input);
-            if (size == null)
-            {
-                return false;
-            }
-            byte[] inputData = input.ReadBytes(size.Value);
-            if (inputData.Length != size.Value)
-            {
-                throw new EndOfStreamException("Read " + inputData.Length + " bytes of data when expecting " + size);
-            }
-            ConformanceRequest request = ConformanceRequest.Parser.ParseFrom(inputData);
-            ConformanceResponse response = PerformRequest(request);
-            byte[] outputData = response.ToByteArray();
-            output.Write(outputData.Length);
-            output.Write(outputData);
-            // Ready for another test...
-            return true;
-        }
-
-        private static ConformanceResponse PerformRequest(ConformanceRequest request)
-        {
-            TestAllTypes message;
-            switch (request.PayloadCase)
-            {
-                case ConformanceRequest.PayloadOneofCase.JsonPayload:
-                    return new ConformanceResponse { Skipped = "JSON parsing not implemented in C# yet" };
-                case ConformanceRequest.PayloadOneofCase.ProtobufPayload:
-                    try
-                    {
-                        message = TestAllTypes.Parser.ParseFrom(request.ProtobufPayload);
-                    }
-                    catch (InvalidProtocolBufferException e)
-                    {
-                        return new ConformanceResponse { ParseError = e.Message };
-                    }
-                    break;
-                default:
-                    throw new Exception("Unsupported request payload: " + request.PayloadCase);
-            }
-            switch (request.RequestedOutputFormat)
-            {
-                case global::Conformance.WireFormat.JSON:
-                    return new ConformanceResponse { JsonPayload = JsonFormatter.Default.Format(message) };
-                case global::Conformance.WireFormat.PROTOBUF:
-                    return new ConformanceResponse { ProtobufPayload = message.ToByteString() };
-                default:
-                    throw new Exception("Unsupported request output format: " + request.PayloadCase);
-            }
-        }
-
-        private static int? ReadInt32(BinaryReader input)
-        {
-            byte[] bytes = input.ReadBytes(4);
-            if (bytes.Length == 0)
-            {
-                // Cleanly reached the end of the stream
-                return null;
-            }
-            if (bytes.Length != 4)
-            {
-                throw new EndOfStreamException("Read " + bytes.Length + " bytes of size when expecting 4");
-            }
-            return bytes[0] | (bytes[1] << 8) | (bytes[2] << 16) | (bytes[3] << 24);
-        }
-    }
-}