csharp/src/ProtocolBuffers.Test/CodedInputStreamTest.cs - third_party/github/protocolbuffers/protobuf - Git at Google

 #region Copyright notice and license

 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
 // http://github.com/jskeet/dotnet-protobufs/
 // Original C++/Java/Python code:
 // http://code.google.com/p/protobuf/
 //
 // 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 System;
 using System.Collections.Generic;
 using System.IO;
 using Google.ProtocolBuffers.Descriptors;
 using Google.ProtocolBuffers.TestProtos;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System.Diagnostics;

 namespace Google.ProtocolBuffers
 {
     [TestClass]
     public class CodedInputStreamTest
     {
         /// <summary>
         /// Helper to construct a byte array from a bunch of bytes.  The inputs are
         /// actually ints so that I can use hex notation and not get stupid errors
         /// about precision.
         /// </summary>
         private static byte[] Bytes(params int[] bytesAsInts)
         {
             byte[] bytes = new byte[bytesAsInts.Length];
             for (int i = 0; i < bytesAsInts.Length; i++)
             {
                 bytes[i] = (byte) bytesAsInts[i];
             }
             return bytes;
         }

         /// <summary>
         /// Parses the given bytes using ReadRawVarint32() and ReadRawVarint64() and
         /// </summary>
         private static void AssertReadVarint(byte[] data, ulong value)
         {
             CodedInputStream input = CodedInputStream.CreateInstance(data);
             Assert.AreEqual((uint) value, input.ReadRawVarint32());

             input = CodedInputStream.CreateInstance(data);
             Assert.AreEqual(value, input.ReadRawVarint64());
             Assert.IsTrue(input.IsAtEnd);

             // Try different block sizes.
             for (int bufferSize = 1; bufferSize <= 16; bufferSize *= 2)
             {
                 input = CodedInputStream.CreateInstance(new SmallBlockInputStream(data, bufferSize));
                 Assert.AreEqual((uint) value, input.ReadRawVarint32());

                 input = CodedInputStream.CreateInstance(new SmallBlockInputStream(data, bufferSize));
                 Assert.AreEqual(value, input.ReadRawVarint64());
                 Assert.IsTrue(input.IsAtEnd);
             }

             // Try reading directly from a MemoryStream. We want to verify that it
             // doesn't read past the end of the input, so write an extra byte - this
             // lets us test the position at the end.
             MemoryStream memoryStream = new MemoryStream();
             memoryStream.Write(data, 0, data.Length);
             memoryStream.WriteByte(0);
             memoryStream.Position = 0;
             Assert.AreEqual((uint) value, CodedInputStream.ReadRawVarint32(memoryStream));
             Assert.AreEqual(data.Length, memoryStream.Position);
         }

         /// <summary>
         /// Parses the given bytes using ReadRawVarint32() and ReadRawVarint64() and
         /// expects them to fail with an InvalidProtocolBufferException whose
         /// description matches the given one.
         /// </summary>
         private static void AssertReadVarintFailure(InvalidProtocolBufferException expected, byte[] data)
         {
             CodedInputStream input = CodedInputStream.CreateInstance(data);
             try
             {
                 input.ReadRawVarint32();
                 Assert.Fail("Should have thrown an exception.");
             }
             catch (InvalidProtocolBufferException e)
             {
                 Assert.AreEqual(expected.Message, e.Message);
             }

             input = CodedInputStream.CreateInstance(data);
             try
             {
                 input.ReadRawVarint64();
                 Assert.Fail("Should have thrown an exception.");
             }
             catch (InvalidProtocolBufferException e)
             {
                 Assert.AreEqual(expected.Message, e.Message);
             }

             // Make sure we get the same error when reading directly from a Stream.
             try
             {
                 CodedInputStream.ReadRawVarint32(new MemoryStream(data));
                 Assert.Fail("Should have thrown an exception.");
             }
             catch (InvalidProtocolBufferException e)
             {
                 Assert.AreEqual(expected.Message, e.Message);
             }
         }

         [TestMethod]
         public void ReadVarint()
         {
             AssertReadVarint(Bytes(0x00), 0);
             AssertReadVarint(Bytes(0x01), 1);
             AssertReadVarint(Bytes(0x7f), 127);
             // 14882
             AssertReadVarint(Bytes(0xa2, 0x74), (0x22 << 0) | (0x74 << 7));
             // 2961488830
             AssertReadVarint(Bytes(0xbe, 0xf7, 0x92, 0x84, 0x0b),
                              (0x3e << 0) | (0x77 << 7) | (0x12 << 14) | (0x04 << 21) |
                              (0x0bL << 28));

             // 64-bit
             // 7256456126
             AssertReadVarint(Bytes(0xbe, 0xf7, 0x92, 0x84, 0x1b),
                              (0x3e << 0) | (0x77 << 7) | (0x12 << 14) | (0x04 << 21) |
                              (0x1bL << 28));
             // 41256202580718336
             AssertReadVarint(Bytes(0x80, 0xe6, 0xeb, 0x9c, 0xc3, 0xc9, 0xa4, 0x49),
                              (0x00 << 0) | (0x66 << 7) | (0x6b << 14) | (0x1c << 21) |
                              (0x43L << 28) | (0x49L << 35) | (0x24L << 42) | (0x49L << 49));
             // 11964378330978735131
             AssertReadVarint(Bytes(0x9b, 0xa8, 0xf9, 0xc2, 0xbb, 0xd6, 0x80, 0x85, 0xa6, 0x01),
                              (0x1b << 0) | (0x28 << 7) | (0x79 << 14) | (0x42 << 21) |
                              (0x3bUL << 28) | (0x56UL << 35) | (0x00UL << 42) |
                              (0x05UL << 49) | (0x26UL << 56) | (0x01UL << 63));

             // Failures
             AssertReadVarintFailure(
                 InvalidProtocolBufferException.MalformedVarint(),
                 Bytes(0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
                       0x00));
             AssertReadVarintFailure(
                 InvalidProtocolBufferException.TruncatedMessage(),
                 Bytes(0x80));
         }

         /// <summary>
         /// Parses the given bytes using ReadRawLittleEndian32() and checks
         /// that the result matches the given value.
         /// </summary>
         private static void AssertReadLittleEndian32(byte[] data, uint value)
         {
             CodedInputStream input = CodedInputStream.CreateInstance(data);
             Assert.AreEqual(value, input.ReadRawLittleEndian32());
             Assert.IsTrue(input.IsAtEnd);

             // Try different block sizes.
             for (int blockSize = 1; blockSize <= 16; blockSize *= 2)
             {
                 input = CodedInputStream.CreateInstance(
                     new SmallBlockInputStream(data, blockSize));
                 Assert.AreEqual(value, input.ReadRawLittleEndian32());
                 Assert.IsTrue(input.IsAtEnd);
             }
         }

         /// <summary>
         /// Parses the given bytes using ReadRawLittleEndian64() and checks
         /// that the result matches the given value.
         /// </summary>
         private static void AssertReadLittleEndian64(byte[] data, ulong value)
         {
             CodedInputStream input = CodedInputStream.CreateInstance(data);
             Assert.AreEqual(value, input.ReadRawLittleEndian64());
             Assert.IsTrue(input.IsAtEnd);

             // Try different block sizes.
             for (int blockSize = 1; blockSize <= 16; blockSize *= 2)
             {
                 input = CodedInputStream.CreateInstance(
                     new SmallBlockInputStream(data, blockSize));
                 Assert.AreEqual(value, input.ReadRawLittleEndian64());
                 Assert.IsTrue(input.IsAtEnd);
             }
         }

         [TestMethod]
         public void ReadLittleEndian()
         {
             AssertReadLittleEndian32(Bytes(0x78, 0x56, 0x34, 0x12), 0x12345678);
             AssertReadLittleEndian32(Bytes(0xf0, 0xde, 0xbc, 0x9a), 0x9abcdef0);

             AssertReadLittleEndian64(Bytes(0xf0, 0xde, 0xbc, 0x9a, 0x78, 0x56, 0x34, 0x12),
                                      0x123456789abcdef0L);
             AssertReadLittleEndian64(
                 Bytes(0x78, 0x56, 0x34, 0x12, 0xf0, 0xde, 0xbc, 0x9a), 0x9abcdef012345678UL);
         }

         [TestMethod]
         public void DecodeZigZag32()
         {
             Assert.AreEqual(0, CodedInputStream.DecodeZigZag32(0));
             Assert.AreEqual(-1, CodedInputStream.DecodeZigZag32(1));
             Assert.AreEqual(1, CodedInputStream.DecodeZigZag32(2));
             Assert.AreEqual(-2, CodedInputStream.DecodeZigZag32(3));
             Assert.AreEqual(0x3FFFFFFF, CodedInputStream.DecodeZigZag32(0x7FFFFFFE));
             Assert.AreEqual(unchecked((int) 0xC0000000), CodedInputStream.DecodeZigZag32(0x7FFFFFFF));
             Assert.AreEqual(0x7FFFFFFF, CodedInputStream.DecodeZigZag32(0xFFFFFFFE));
             Assert.AreEqual(unchecked((int) 0x80000000), CodedInputStream.DecodeZigZag32(0xFFFFFFFF));
         }

         [TestMethod]
         public void DecodeZigZag64()
         {
             Assert.AreEqual(0, CodedInputStream.DecodeZigZag64(0));
             Assert.AreEqual(-1, CodedInputStream.DecodeZigZag64(1));
             Assert.AreEqual(1, CodedInputStream.DecodeZigZag64(2));
             Assert.AreEqual(-2, CodedInputStream.DecodeZigZag64(3));
             Assert.AreEqual(0x000000003FFFFFFFL, CodedInputStream.DecodeZigZag64(0x000000007FFFFFFEL));
             Assert.AreEqual(unchecked((long) 0xFFFFFFFFC0000000L), CodedInputStream.DecodeZigZag64(0x000000007FFFFFFFL));
             Assert.AreEqual(0x000000007FFFFFFFL, CodedInputStream.DecodeZigZag64(0x00000000FFFFFFFEL));
             Assert.AreEqual(unchecked((long) 0xFFFFFFFF80000000L), CodedInputStream.DecodeZigZag64(0x00000000FFFFFFFFL));
             Assert.AreEqual(0x7FFFFFFFFFFFFFFFL, CodedInputStream.DecodeZigZag64(0xFFFFFFFFFFFFFFFEL));
             Assert.AreEqual(unchecked((long) 0x8000000000000000L), CodedInputStream.DecodeZigZag64(0xFFFFFFFFFFFFFFFFL));
         }

         [TestMethod]
         public void ReadWholeMessage()
         {
             TestAllTypes message = TestUtil.GetAllSet();

             byte[] rawBytes = message.ToByteArray();
             Assert.AreEqual(rawBytes.Length, message.SerializedSize);
             TestAllTypes message2 = TestAllTypes.ParseFrom(rawBytes);
             TestUtil.AssertAllFieldsSet(message2);

             // Try different block sizes.
             for (int blockSize = 1; blockSize < 256; blockSize *= 2)
             {
                 message2 = TestAllTypes.ParseFrom(new SmallBlockInputStream(rawBytes, blockSize));
                 TestUtil.AssertAllFieldsSet(message2);
             }
         }

         [TestMethod]
         public void SkipWholeMessage()
         {
             TestAllTypes message = TestUtil.GetAllSet();
             byte[] rawBytes = message.ToByteArray();

             // Create two parallel inputs.  Parse one as unknown fields while using
             // skipField() to skip each field on the other.  Expect the same tags.
             CodedInputStream input1 = CodedInputStream.CreateInstance(rawBytes);
             CodedInputStream input2 = CodedInputStream.CreateInstance(rawBytes);
             UnknownFieldSet.Builder unknownFields = UnknownFieldSet.CreateBuilder();

             uint tag;
             string name;
             while (input1.ReadTag(out tag, out name))
             {
                 uint tag2;
                 Assert.IsTrue(input2.ReadTag(out tag2, out name));
                 Assert.AreEqual(tag, tag2);

                 unknownFields.MergeFieldFrom(tag, input1);
                 input2.SkipField();
             }
         }

         /// <summary>
         /// Test that a bug in SkipRawBytes has been fixed: if the skip
         /// skips exactly up to a limit, this should bnot break things
         /// </summary>
         [TestMethod]
         public void SkipRawBytesBug()
         {
             byte[] rawBytes = new byte[] {1, 2};
             CodedInputStream input = CodedInputStream.CreateInstance(rawBytes);

             int limit = input.PushLimit(1);
             input.SkipRawBytes(1);
             input.PopLimit(limit);
             Assert.AreEqual(2, input.ReadRawByte());
         }

         public void ReadHugeBlob()
         {
             // Allocate and initialize a 1MB blob.
             byte[] blob = new byte[1 << 20];
             for (int i = 0; i < blob.Length; i++)
             {
                 blob[i] = (byte) i;
             }

             // Make a message containing it.
             TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();
             TestUtil.SetAllFields(builder);
             builder.SetOptionalBytes(ByteString.CopyFrom(blob));
             TestAllTypes message = builder.Build();

             // Serialize and parse it.  Make sure to parse from an InputStream, not
             // directly from a ByteString, so that CodedInputStream uses buffered
             // reading.
             TestAllTypes message2 = TestAllTypes.ParseFrom(message.ToByteString().CreateCodedInput());

             Assert.AreEqual(message.OptionalBytes, message2.OptionalBytes);

             // Make sure all the other fields were parsed correctly.
             TestAllTypes message3 = TestAllTypes.CreateBuilder(message2)
                 .SetOptionalBytes(TestUtil.GetAllSet().OptionalBytes)
                 .Build();
             TestUtil.AssertAllFieldsSet(message3);
         }

         [TestMethod]
         public void ReadMaliciouslyLargeBlob()
         {
             MemoryStream ms = new MemoryStream();
             CodedOutputStream output = CodedOutputStream.CreateInstance(ms);

             uint tag = WireFormat.MakeTag(1, WireFormat.WireType.LengthDelimited);
             output.WriteRawVarint32(tag);
             output.WriteRawVarint32(0x7FFFFFFF);
             output.WriteRawBytes(new byte[32]); // Pad with a few random bytes.
             output.Flush();
             ms.Position = 0;

             CodedInputStream input = CodedInputStream.CreateInstance(ms);
             uint testtag;
             string ignore;
             Assert.IsTrue(input.ReadTag(out testtag, out ignore));
             Assert.AreEqual(tag, testtag);

             try
             {
                 ByteString bytes = null;
                 input.ReadBytes(ref bytes);
                 Assert.Fail("Should have thrown an exception!");
             }
             catch (InvalidProtocolBufferException)
             {
                 // success.
             }
         }

         private static TestRecursiveMessage MakeRecursiveMessage(int depth)
         {
             if (depth == 0)
             {
                 return TestRecursiveMessage.CreateBuilder().SetI(5).Build();
             }
             else
             {
                 return TestRecursiveMessage.CreateBuilder()
                     .SetA(MakeRecursiveMessage(depth - 1)).Build();
             }
         }

         private static void AssertMessageDepth(TestRecursiveMessage message, int depth)
         {
             if (depth == 0)
             {
                 Assert.IsFalse(message.HasA);
                 Assert.AreEqual(5, message.I);
             }
             else
             {
                 Assert.IsTrue(message.HasA);
                 AssertMessageDepth(message.A, depth - 1);
             }
         }

         [TestMethod]
         public void MaliciousRecursion()
         {
             ByteString data64 = MakeRecursiveMessage(64).ToByteString();
             ByteString data65 = MakeRecursiveMessage(65).ToByteString();

             AssertMessageDepth(TestRecursiveMessage.ParseFrom(data64), 64);

             try
             {
                 TestRecursiveMessage.ParseFrom(data65);
                 Assert.Fail("Should have thrown an exception!");
             }
             catch (InvalidProtocolBufferException)
             {
                 // success.
             }

             CodedInputStream input = data64.CreateCodedInput();
             input.SetRecursionLimit(8);
             try
             {
                 TestRecursiveMessage.ParseFrom(input);
                 Assert.Fail("Should have thrown an exception!");
             }
             catch (InvalidProtocolBufferException)
             {
                 // success.
             }
         }

         [TestMethod]
         public void SizeLimit()
         {
             // Have to use a Stream rather than ByteString.CreateCodedInput as SizeLimit doesn't
             // apply to the latter case.
             MemoryStream ms = new MemoryStream(TestUtil.GetAllSet().ToByteString().ToByteArray());
             CodedInputStream input = CodedInputStream.CreateInstance(ms);
             input.SetSizeLimit(16);

             try
             {
                 TestAllTypes.ParseFrom(input);
                 Assert.Fail("Should have thrown an exception!");
             }
             catch (InvalidProtocolBufferException)
             {
                 // success.
             }
         }

         [TestMethod]
         public void ResetSizeCounter()
         {
             CodedInputStream input = CodedInputStream.CreateInstance(
                 new SmallBlockInputStream(new byte[256], 8));
             input.SetSizeLimit(16);
             input.ReadRawBytes(16);

             try
             {
                 input.ReadRawByte();
                 Assert.Fail("Should have thrown an exception!");
             }
             catch (InvalidProtocolBufferException)
             {
                 // Success.
             }

             input.ResetSizeCounter();
             input.ReadRawByte(); // No exception thrown.

             try
             {
                 input.ReadRawBytes(16); // Hits limit again.
                 Assert.Fail("Should have thrown an exception!");
             }
             catch (InvalidProtocolBufferException)
             {
                 // Success.
             }
         }

         /// <summary>
         /// Tests that if we read an string that contains invalid UTF-8, no exception
         /// is thrown.  Instead, the invalid bytes are replaced with the Unicode
         /// "replacement character" U+FFFD.
         /// </summary>
         [TestMethod]
         public void ReadInvalidUtf8()
         {
             MemoryStream ms = new MemoryStream();
             CodedOutputStream output = CodedOutputStream.CreateInstance(ms);

             uint tag = WireFormat.MakeTag(1, WireFormat.WireType.LengthDelimited);
             output.WriteRawVarint32(tag);
             output.WriteRawVarint32(1);
             output.WriteRawBytes(new byte[] {0x80});
             output.Flush();
             ms.Position = 0;

             CodedInputStream input = CodedInputStream.CreateInstance(ms);

             uint testtag;
             string ignored;

             Assert.IsTrue(input.ReadTag(out testtag, out ignored));
             Assert.AreEqual(tag, testtag);
             string text = null;
             input.ReadString(ref text);
             Assert.AreEqual('\ufffd', text[0]);
         }

         /// <summary>
         /// A stream which limits the number of bytes it reads at a time.
         /// We use this to make sure that CodedInputStream doesn't screw up when
         /// reading in small blocks.
         /// </summary>
         private sealed class SmallBlockInputStream : MemoryStream
         {
             private readonly int blockSize;

             public SmallBlockInputStream(byte[] data, int blockSize)
                 : base(data)
             {
                 this.blockSize = blockSize;
             }

             public override int Read(byte[] buffer, int offset, int count)
             {
                 return base.Read(buffer, offset, Math.Min(count, blockSize));
             }
         }

         enum TestNegEnum { None = 0, Value = -2 }

         [TestMethod]
         public void TestNegativeEnum()
         {
             byte[] bytes = new byte[10] { 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01 };
             CodedInputStream input = CodedInputStream.CreateInstance(bytes);
             object unk;
             TestNegEnum val = TestNegEnum.None;

             Assert.IsTrue(input.ReadEnum(ref val, out unk));
             Assert.IsTrue(input.IsAtEnd);
             Assert.AreEqual(TestNegEnum.Value, val);
         }

         [TestMethod]
         public void TestNegativeEnumPackedArray()
         {
             int arraySize = 1 + (10 * 5);
             int msgSize = 1 + 1 + arraySize;
             byte[] bytes = new byte[msgSize];
             CodedOutputStream output = CodedOutputStream.CreateInstance(bytes);
             output.WritePackedInt32Array(8, "", arraySize, new int[] { 0, -1, -2, -3, -4, -5 });

             Assert.AreEqual(0, output.SpaceLeft);

             CodedInputStream input = CodedInputStream.CreateInstance(bytes);
             uint tag;
             string name;
             Assert.IsTrue(input.ReadTag(out tag, out name));

             List<TestNegEnum> values = new List<TestNegEnum>();
             ICollection<object> unk;
             input.ReadEnumArray(tag, name, values, out unk);

             Assert.AreEqual(2, values.Count);
             Assert.AreEqual(TestNegEnum.None, values[0]);
             Assert.AreEqual(TestNegEnum.Value, values[1]);

             Assert.IsNotNull(unk);
             Assert.AreEqual(4, unk.Count);
         }

         [TestMethod]
         public void TestNegativeEnumArray()
         {
             int arraySize = 1 + 1 + (11 * 5);
             int msgSize = arraySize;
             byte[] bytes = new byte[msgSize];
             CodedOutputStream output = CodedOutputStream.CreateInstance(bytes);
             output.WriteInt32Array(8, "", new int[] { 0, -1, -2, -3, -4, -5 });

             Assert.AreEqual(0, output.SpaceLeft);

             CodedInputStream input = CodedInputStream.CreateInstance(bytes);
             uint tag;
             string name;
             Assert.IsTrue(input.ReadTag(out tag, out name));

             List<TestNegEnum> values = new List<TestNegEnum>();
             ICollection<object> unk;
             input.ReadEnumArray(tag, name, values, out unk);

             Assert.AreEqual(2, values.Count);
             Assert.AreEqual(TestNegEnum.None, values[0]);
             Assert.AreEqual(TestNegEnum.Value, values[1]);

             Assert.IsNotNull(unk);
             Assert.AreEqual(4, unk.Count);
         }

         //Issue 71:	CodedInputStream.ReadBytes go to slow path unnecessarily
         [TestMethod]
         public void TestSlowPathAvoidance()
         {
             using (var ms = new MemoryStream())
             {
                 CodedOutputStream output = CodedOutputStream.CreateInstance(ms);
                 output.WriteField(FieldType.Bytes, 1, "bytes", ByteString.CopyFrom(new byte[100]));
                 output.WriteField(FieldType.Bytes, 2, "bytes", ByteString.CopyFrom(new byte[100]));
                 output.Flush();

                 ms.Position = 0;
                 CodedInputStream input = CodedInputStream.CreateInstance(ms, new byte[ms.Length / 2]);

                 uint tag;
                 string ignore;
                 ByteString value;

                 Assert.IsTrue(input.ReadTag(out tag, out ignore));
                 Assert.AreEqual(1, WireFormat.GetTagFieldNumber(tag));
                 value = ByteString.Empty;
                 Assert.IsTrue(input.ReadBytes(ref value) && value.Length == 100);

                 Assert.IsTrue(input.ReadTag(out tag, out ignore));
                 Assert.AreEqual(2, WireFormat.GetTagFieldNumber(tag));
                 value = ByteString.Empty;
                 Assert.IsTrue(input.ReadBytes(ref value) && value.Length == 100);
             }
         }
     }
 }
	#region Copyright notice and license

	// Protocol Buffers - Google's data interchange format
	// Copyright 2008 Google Inc. All rights reserved.
	// http://github.com/jskeet/dotnet-protobufs/
	// Original C++/Java/Python code:
	// http://code.google.com/p/protobuf/
	//
	// 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 System;
	using System.Collections.Generic;
	using System.IO;
	using Google.ProtocolBuffers.Descriptors;
	using Google.ProtocolBuffers.TestProtos;
	using Microsoft.VisualStudio.TestTools.UnitTesting;
	using System.Diagnostics;

	namespace Google.ProtocolBuffers
	{
	[TestClass]
	public class CodedInputStreamTest
	{
	/// <summary>
	/// Helper to construct a byte array from a bunch of bytes. The inputs are
	/// actually ints so that I can use hex notation and not get stupid errors
	/// about precision.
	/// </summary>
	private static byte[] Bytes(params int[] bytesAsInts)
	{
	byte[] bytes = new byte[bytesAsInts.Length];
	for (int i = 0; i < bytesAsInts.Length; i++)
	{
	bytes[i] = (byte) bytesAsInts[i];
	}
	return bytes;
	}

	/// <summary>
	/// Parses the given bytes using ReadRawVarint32() and ReadRawVarint64() and
	/// </summary>
	private static void AssertReadVarint(byte[] data, ulong value)
	{
	CodedInputStream input = CodedInputStream.CreateInstance(data);
	Assert.AreEqual((uint) value, input.ReadRawVarint32());

	input = CodedInputStream.CreateInstance(data);
	Assert.AreEqual(value, input.ReadRawVarint64());
	Assert.IsTrue(input.IsAtEnd);

	// Try different block sizes.
	for (int bufferSize = 1; bufferSize <= 16; bufferSize *= 2)
	{
	input = CodedInputStream.CreateInstance(new SmallBlockInputStream(data, bufferSize));
	Assert.AreEqual((uint) value, input.ReadRawVarint32());

	input = CodedInputStream.CreateInstance(new SmallBlockInputStream(data, bufferSize));
	Assert.AreEqual(value, input.ReadRawVarint64());
	Assert.IsTrue(input.IsAtEnd);
	}

	// Try reading directly from a MemoryStream. We want to verify that it
	// doesn't read past the end of the input, so write an extra byte - this
	// lets us test the position at the end.
	MemoryStream memoryStream = new MemoryStream();
	memoryStream.Write(data, 0, data.Length);
	memoryStream.WriteByte(0);
	memoryStream.Position = 0;
	Assert.AreEqual((uint) value, CodedInputStream.ReadRawVarint32(memoryStream));
	Assert.AreEqual(data.Length, memoryStream.Position);
	}

	/// <summary>
	/// Parses the given bytes using ReadRawVarint32() and ReadRawVarint64() and
	/// expects them to fail with an InvalidProtocolBufferException whose
	/// description matches the given one.
	/// </summary>
	private static void AssertReadVarintFailure(InvalidProtocolBufferException expected, byte[] data)
	{
	CodedInputStream input = CodedInputStream.CreateInstance(data);
	try
	{
	input.ReadRawVarint32();
	Assert.Fail("Should have thrown an exception.");
	}
	catch (InvalidProtocolBufferException e)
	{
	Assert.AreEqual(expected.Message, e.Message);
	}

	input = CodedInputStream.CreateInstance(data);
	try
	{
	input.ReadRawVarint64();
	Assert.Fail("Should have thrown an exception.");
	}
	catch (InvalidProtocolBufferException e)
	{
	Assert.AreEqual(expected.Message, e.Message);
	}

	// Make sure we get the same error when reading directly from a Stream.
	try
	{
	CodedInputStream.ReadRawVarint32(new MemoryStream(data));
	Assert.Fail("Should have thrown an exception.");
	}
	catch (InvalidProtocolBufferException e)
	{
	Assert.AreEqual(expected.Message, e.Message);
	}
	}

	[TestMethod]
	public void ReadVarint()
	{
	AssertReadVarint(Bytes(0x00), 0);
	AssertReadVarint(Bytes(0x01), 1);
	AssertReadVarint(Bytes(0x7f), 127);
	// 14882
	AssertReadVarint(Bytes(0xa2, 0x74), (0x22 << 0) \| (0x74 << 7));
	// 2961488830
	AssertReadVarint(Bytes(0xbe, 0xf7, 0x92, 0x84, 0x0b),
	(0x3e << 0) \| (0x77 << 7) \| (0x12 << 14) \| (0x04 << 21) \|
	(0x0bL << 28));

	// 64-bit
	// 7256456126
	AssertReadVarint(Bytes(0xbe, 0xf7, 0x92, 0x84, 0x1b),
	(0x3e << 0) \| (0x77 << 7) \| (0x12 << 14) \| (0x04 << 21) \|
	(0x1bL << 28));
	// 41256202580718336
	AssertReadVarint(Bytes(0x80, 0xe6, 0xeb, 0x9c, 0xc3, 0xc9, 0xa4, 0x49),
	(0x00 << 0) \| (0x66 << 7) \| (0x6b << 14) \| (0x1c << 21) \|
	(0x43L << 28) \| (0x49L << 35) \| (0x24L << 42) \| (0x49L << 49));
	// 11964378330978735131
	AssertReadVarint(Bytes(0x9b, 0xa8, 0xf9, 0xc2, 0xbb, 0xd6, 0x80, 0x85, 0xa6, 0x01),
	(0x1b << 0) \| (0x28 << 7) \| (0x79 << 14) \| (0x42 << 21) \|
	(0x3bUL << 28) \| (0x56UL << 35) \| (0x00UL << 42) \|
	(0x05UL << 49) \| (0x26UL << 56) \| (0x01UL << 63));

	// Failures
	AssertReadVarintFailure(
	InvalidProtocolBufferException.MalformedVarint(),
	Bytes(0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
	0x00));
	AssertReadVarintFailure(
	InvalidProtocolBufferException.TruncatedMessage(),
	Bytes(0x80));
	}

	/// <summary>
	/// Parses the given bytes using ReadRawLittleEndian32() and checks
	/// that the result matches the given value.
	/// </summary>
	private static void AssertReadLittleEndian32(byte[] data, uint value)
	{
	CodedInputStream input = CodedInputStream.CreateInstance(data);
	Assert.AreEqual(value, input.ReadRawLittleEndian32());
	Assert.IsTrue(input.IsAtEnd);

	// Try different block sizes.
	for (int blockSize = 1; blockSize <= 16; blockSize *= 2)
	{
	input = CodedInputStream.CreateInstance(
	new SmallBlockInputStream(data, blockSize));
	Assert.AreEqual(value, input.ReadRawLittleEndian32());
	Assert.IsTrue(input.IsAtEnd);
	}
	}

	/// <summary>
	/// Parses the given bytes using ReadRawLittleEndian64() and checks
	/// that the result matches the given value.
	/// </summary>
	private static void AssertReadLittleEndian64(byte[] data, ulong value)
	{
	CodedInputStream input = CodedInputStream.CreateInstance(data);
	Assert.AreEqual(value, input.ReadRawLittleEndian64());
	Assert.IsTrue(input.IsAtEnd);

	// Try different block sizes.
	for (int blockSize = 1; blockSize <= 16; blockSize *= 2)
	{
	input = CodedInputStream.CreateInstance(
	new SmallBlockInputStream(data, blockSize));
	Assert.AreEqual(value, input.ReadRawLittleEndian64());
	Assert.IsTrue(input.IsAtEnd);
	}
	}

	[TestMethod]
	public void ReadLittleEndian()
	{
	AssertReadLittleEndian32(Bytes(0x78, 0x56, 0x34, 0x12), 0x12345678);
	AssertReadLittleEndian32(Bytes(0xf0, 0xde, 0xbc, 0x9a), 0x9abcdef0);

	AssertReadLittleEndian64(Bytes(0xf0, 0xde, 0xbc, 0x9a, 0x78, 0x56, 0x34, 0x12),
	0x123456789abcdef0L);
	AssertReadLittleEndian64(
	Bytes(0x78, 0x56, 0x34, 0x12, 0xf0, 0xde, 0xbc, 0x9a), 0x9abcdef012345678UL);
	}

	[TestMethod]
	public void DecodeZigZag32()
	{
	Assert.AreEqual(0, CodedInputStream.DecodeZigZag32(0));
	Assert.AreEqual(-1, CodedInputStream.DecodeZigZag32(1));
	Assert.AreEqual(1, CodedInputStream.DecodeZigZag32(2));
	Assert.AreEqual(-2, CodedInputStream.DecodeZigZag32(3));
	Assert.AreEqual(0x3FFFFFFF, CodedInputStream.DecodeZigZag32(0x7FFFFFFE));
	Assert.AreEqual(unchecked((int) 0xC0000000), CodedInputStream.DecodeZigZag32(0x7FFFFFFF));
	Assert.AreEqual(0x7FFFFFFF, CodedInputStream.DecodeZigZag32(0xFFFFFFFE));
	Assert.AreEqual(unchecked((int) 0x80000000), CodedInputStream.DecodeZigZag32(0xFFFFFFFF));
	}

	[TestMethod]
	public void DecodeZigZag64()
	{
	Assert.AreEqual(0, CodedInputStream.DecodeZigZag64(0));
	Assert.AreEqual(-1, CodedInputStream.DecodeZigZag64(1));
	Assert.AreEqual(1, CodedInputStream.DecodeZigZag64(2));
	Assert.AreEqual(-2, CodedInputStream.DecodeZigZag64(3));
	Assert.AreEqual(0x000000003FFFFFFFL, CodedInputStream.DecodeZigZag64(0x000000007FFFFFFEL));
	Assert.AreEqual(unchecked((long) 0xFFFFFFFFC0000000L), CodedInputStream.DecodeZigZag64(0x000000007FFFFFFFL));
	Assert.AreEqual(0x000000007FFFFFFFL, CodedInputStream.DecodeZigZag64(0x00000000FFFFFFFEL));
	Assert.AreEqual(unchecked((long) 0xFFFFFFFF80000000L), CodedInputStream.DecodeZigZag64(0x00000000FFFFFFFFL));
	Assert.AreEqual(0x7FFFFFFFFFFFFFFFL, CodedInputStream.DecodeZigZag64(0xFFFFFFFFFFFFFFFEL));
	Assert.AreEqual(unchecked((long) 0x8000000000000000L), CodedInputStream.DecodeZigZag64(0xFFFFFFFFFFFFFFFFL));
	}

	[TestMethod]
	public void ReadWholeMessage()
	{
	TestAllTypes message = TestUtil.GetAllSet();

	byte[] rawBytes = message.ToByteArray();
	Assert.AreEqual(rawBytes.Length, message.SerializedSize);
	TestAllTypes message2 = TestAllTypes.ParseFrom(rawBytes);
	TestUtil.AssertAllFieldsSet(message2);

	// Try different block sizes.
	for (int blockSize = 1; blockSize < 256; blockSize *= 2)
	{
	message2 = TestAllTypes.ParseFrom(new SmallBlockInputStream(rawBytes, blockSize));
	TestUtil.AssertAllFieldsSet(message2);
	}
	}

	[TestMethod]
	public void SkipWholeMessage()
	{
	TestAllTypes message = TestUtil.GetAllSet();
	byte[] rawBytes = message.ToByteArray();

	// Create two parallel inputs. Parse one as unknown fields while using
	// skipField() to skip each field on the other. Expect the same tags.
	CodedInputStream input1 = CodedInputStream.CreateInstance(rawBytes);
	CodedInputStream input2 = CodedInputStream.CreateInstance(rawBytes);
	UnknownFieldSet.Builder unknownFields = UnknownFieldSet.CreateBuilder();

	uint tag;
	string name;
	while (input1.ReadTag(out tag, out name))
	{
	uint tag2;
	Assert.IsTrue(input2.ReadTag(out tag2, out name));
	Assert.AreEqual(tag, tag2);

	unknownFields.MergeFieldFrom(tag, input1);
	input2.SkipField();
	}
	}

	/// <summary>
	/// Test that a bug in SkipRawBytes has been fixed: if the skip
	/// skips exactly up to a limit, this should bnot break things
	/// </summary>
	[TestMethod]
	public void SkipRawBytesBug()
	{
	byte[] rawBytes = new byte[] {1, 2};
	CodedInputStream input = CodedInputStream.CreateInstance(rawBytes);

	int limit = input.PushLimit(1);
	input.SkipRawBytes(1);
	input.PopLimit(limit);
	Assert.AreEqual(2, input.ReadRawByte());
	}

	public void ReadHugeBlob()
	{
	// Allocate and initialize a 1MB blob.
	byte[] blob = new byte[1 << 20];
	for (int i = 0; i < blob.Length; i++)
	{
	blob[i] = (byte) i;
	}

	// Make a message containing it.
	TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();
	TestUtil.SetAllFields(builder);
	builder.SetOptionalBytes(ByteString.CopyFrom(blob));
	TestAllTypes message = builder.Build();

	// Serialize and parse it. Make sure to parse from an InputStream, not
	// directly from a ByteString, so that CodedInputStream uses buffered
	// reading.
	TestAllTypes message2 = TestAllTypes.ParseFrom(message.ToByteString().CreateCodedInput());

	Assert.AreEqual(message.OptionalBytes, message2.OptionalBytes);

	// Make sure all the other fields were parsed correctly.
	TestAllTypes message3 = TestAllTypes.CreateBuilder(message2)
	.SetOptionalBytes(TestUtil.GetAllSet().OptionalBytes)
	.Build();
	TestUtil.AssertAllFieldsSet(message3);
	}

	[TestMethod]
	public void ReadMaliciouslyLargeBlob()
	{
	MemoryStream ms = new MemoryStream();
	CodedOutputStream output = CodedOutputStream.CreateInstance(ms);

	uint tag = WireFormat.MakeTag(1, WireFormat.WireType.LengthDelimited);
	output.WriteRawVarint32(tag);
	output.WriteRawVarint32(0x7FFFFFFF);
	output.WriteRawBytes(new byte[32]); // Pad with a few random bytes.
	output.Flush();
	ms.Position = 0;

	CodedInputStream input = CodedInputStream.CreateInstance(ms);
	uint testtag;
	string ignore;
	Assert.IsTrue(input.ReadTag(out testtag, out ignore));
	Assert.AreEqual(tag, testtag);

	try
	{
	ByteString bytes = null;
	input.ReadBytes(ref bytes);
	Assert.Fail("Should have thrown an exception!");
	}
	catch (InvalidProtocolBufferException)
	{
	// success.
	}
	}

	private static TestRecursiveMessage MakeRecursiveMessage(int depth)
	{
	if (depth == 0)
	{
	return TestRecursiveMessage.CreateBuilder().SetI(5).Build();
	}
	else
	{
	return TestRecursiveMessage.CreateBuilder()
	.SetA(MakeRecursiveMessage(depth - 1)).Build();
	}
	}

	private static void AssertMessageDepth(TestRecursiveMessage message, int depth)
	{
	if (depth == 0)
	{
	Assert.IsFalse(message.HasA);
	Assert.AreEqual(5, message.I);
	}
	else
	{
	Assert.IsTrue(message.HasA);
	AssertMessageDepth(message.A, depth - 1);
	}
	}

	[TestMethod]
	public void MaliciousRecursion()
	{
	ByteString data64 = MakeRecursiveMessage(64).ToByteString();
	ByteString data65 = MakeRecursiveMessage(65).ToByteString();

	AssertMessageDepth(TestRecursiveMessage.ParseFrom(data64), 64);

	try
	{
	TestRecursiveMessage.ParseFrom(data65);
	Assert.Fail("Should have thrown an exception!");
	}
	catch (InvalidProtocolBufferException)
	{
	// success.
	}

	CodedInputStream input = data64.CreateCodedInput();
	input.SetRecursionLimit(8);
	try
	{
	TestRecursiveMessage.ParseFrom(input);
	Assert.Fail("Should have thrown an exception!");
	}
	catch (InvalidProtocolBufferException)
	{
	// success.
	}
	}

	[TestMethod]
	public void SizeLimit()
	{
	// Have to use a Stream rather than ByteString.CreateCodedInput as SizeLimit doesn't
	// apply to the latter case.
	MemoryStream ms = new MemoryStream(TestUtil.GetAllSet().ToByteString().ToByteArray());
	CodedInputStream input = CodedInputStream.CreateInstance(ms);
	input.SetSizeLimit(16);

	try
	{
	TestAllTypes.ParseFrom(input);
	Assert.Fail("Should have thrown an exception!");
	}
	catch (InvalidProtocolBufferException)
	{
	// success.
	}
	}

	[TestMethod]
	public void ResetSizeCounter()
	{
	CodedInputStream input = CodedInputStream.CreateInstance(
	new SmallBlockInputStream(new byte[256], 8));
	input.SetSizeLimit(16);
	input.ReadRawBytes(16);

	try
	{
	input.ReadRawByte();
	Assert.Fail("Should have thrown an exception!");
	}
	catch (InvalidProtocolBufferException)
	{
	// Success.
	}

	input.ResetSizeCounter();
	input.ReadRawByte(); // No exception thrown.

	try
	{
	input.ReadRawBytes(16); // Hits limit again.
	Assert.Fail("Should have thrown an exception!");
	}
	catch (InvalidProtocolBufferException)
	{
	// Success.
	}
	}

	/// <summary>
	/// Tests that if we read an string that contains invalid UTF-8, no exception
	/// is thrown. Instead, the invalid bytes are replaced with the Unicode
	/// "replacement character" U+FFFD.
	/// </summary>
	[TestMethod]
	public void ReadInvalidUtf8()
	{
	MemoryStream ms = new MemoryStream();
	CodedOutputStream output = CodedOutputStream.CreateInstance(ms);

	uint tag = WireFormat.MakeTag(1, WireFormat.WireType.LengthDelimited);
	output.WriteRawVarint32(tag);
	output.WriteRawVarint32(1);
	output.WriteRawBytes(new byte[] {0x80});
	output.Flush();
	ms.Position = 0;

	CodedInputStream input = CodedInputStream.CreateInstance(ms);

	uint testtag;
	string ignored;

	Assert.IsTrue(input.ReadTag(out testtag, out ignored));
	Assert.AreEqual(tag, testtag);
	string text = null;
	input.ReadString(ref text);
	Assert.AreEqual('\ufffd', text[0]);
	}

	/// <summary>
	/// A stream which limits the number of bytes it reads at a time.
	/// We use this to make sure that CodedInputStream doesn't screw up when
	/// reading in small blocks.
	/// </summary>
	private sealed class SmallBlockInputStream : MemoryStream
	{
	private readonly int blockSize;

	public SmallBlockInputStream(byte[] data, int blockSize)
	: base(data)
	{
	this.blockSize = blockSize;
	}

	public override int Read(byte[] buffer, int offset, int count)
	{
	return base.Read(buffer, offset, Math.Min(count, blockSize));
	}
	}

	enum TestNegEnum { None = 0, Value = -2 }

	[TestMethod]
	public void TestNegativeEnum()
	{
	byte[] bytes = new byte[10] { 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x01 };
	CodedInputStream input = CodedInputStream.CreateInstance(bytes);
	object unk;
	TestNegEnum val = TestNegEnum.None;

	Assert.IsTrue(input.ReadEnum(ref val, out unk));
	Assert.IsTrue(input.IsAtEnd);
	Assert.AreEqual(TestNegEnum.Value, val);
	}

	[TestMethod]
	public void TestNegativeEnumPackedArray()
	{
	int arraySize = 1 + (10 * 5);
	int msgSize = 1 + 1 + arraySize;
	byte[] bytes = new byte[msgSize];
	CodedOutputStream output = CodedOutputStream.CreateInstance(bytes);
	output.WritePackedInt32Array(8, "", arraySize, new int[] { 0, -1, -2, -3, -4, -5 });

	Assert.AreEqual(0, output.SpaceLeft);

	CodedInputStream input = CodedInputStream.CreateInstance(bytes);
	uint tag;
	string name;
	Assert.IsTrue(input.ReadTag(out tag, out name));

	List<TestNegEnum> values = new List<TestNegEnum>();
	ICollection<object> unk;
	input.ReadEnumArray(tag, name, values, out unk);

	Assert.AreEqual(2, values.Count);
	Assert.AreEqual(TestNegEnum.None, values[0]);
	Assert.AreEqual(TestNegEnum.Value, values[1]);

	Assert.IsNotNull(unk);
	Assert.AreEqual(4, unk.Count);
	}

	[TestMethod]
	public void TestNegativeEnumArray()
	{
	int arraySize = 1 + 1 + (11 * 5);
	int msgSize = arraySize;
	byte[] bytes = new byte[msgSize];
	CodedOutputStream output = CodedOutputStream.CreateInstance(bytes);
	output.WriteInt32Array(8, "", new int[] { 0, -1, -2, -3, -4, -5 });

	Assert.AreEqual(0, output.SpaceLeft);

	CodedInputStream input = CodedInputStream.CreateInstance(bytes);
	uint tag;
	string name;
	Assert.IsTrue(input.ReadTag(out tag, out name));

	List<TestNegEnum> values = new List<TestNegEnum>();
	ICollection<object> unk;
	input.ReadEnumArray(tag, name, values, out unk);

	Assert.AreEqual(2, values.Count);
	Assert.AreEqual(TestNegEnum.None, values[0]);
	Assert.AreEqual(TestNegEnum.Value, values[1]);

	Assert.IsNotNull(unk);
	Assert.AreEqual(4, unk.Count);
	}

	//Issue 71: CodedInputStream.ReadBytes go to slow path unnecessarily
	[TestMethod]
	public void TestSlowPathAvoidance()
	{
	using (var ms = new MemoryStream())
	{
	CodedOutputStream output = CodedOutputStream.CreateInstance(ms);
	output.WriteField(FieldType.Bytes, 1, "bytes", ByteString.CopyFrom(new byte[100]));
	output.WriteField(FieldType.Bytes, 2, "bytes", ByteString.CopyFrom(new byte[100]));
	output.Flush();

	ms.Position = 0;
	CodedInputStream input = CodedInputStream.CreateInstance(ms, new byte[ms.Length / 2]);

	uint tag;
	string ignore;
	ByteString value;

	Assert.IsTrue(input.ReadTag(out tag, out ignore));
	Assert.AreEqual(1, WireFormat.GetTagFieldNumber(tag));
	value = ByteString.Empty;
	Assert.IsTrue(input.ReadBytes(ref value) && value.Length == 100);

	Assert.IsTrue(input.ReadTag(out tag, out ignore));
	Assert.AreEqual(2, WireFormat.GetTagFieldNumber(tag));
	value = ByteString.Empty;
	Assert.IsTrue(input.ReadBytes(ref value) && value.Length == 100);
	}
	}
	}
	}