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

third_party/protobuf/csharp/src/Google.Protobuf.Test/CodedOutputStreamTest.cs

-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 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 System;
-using System.IO;
-using Google.Protobuf.TestProtos;
-using NUnit.Framework;
-
-namespace Google.Protobuf
-{
-    public class CodedOutputStreamTest
-    {
-        /// <summary>
-        /// Writes the given value using WriteRawVarint32() and WriteRawVarint64() and
-        /// checks that the result matches the given bytes
-        /// </summary>
-        private static void AssertWriteVarint(byte[] data, ulong value)
-        {
-            // Only do 32-bit write if the value fits in 32 bits.
-            if ((value >> 32) == 0)
-            {
-                MemoryStream rawOutput = new MemoryStream();
-                CodedOutputStream output = new CodedOutputStream(rawOutput);
-                output.WriteRawVarint32((uint) value);
-                output.Flush();
-                Assert.AreEqual(data, rawOutput.ToArray());
-                // Also try computing size.
-                Assert.AreEqual(data.Length, CodedOutputStream.ComputeRawVarint32Size((uint) value));
-            }
-
-            {
-                MemoryStream rawOutput = new MemoryStream();
-                CodedOutputStream output = new CodedOutputStream(rawOutput);
-                output.WriteRawVarint64(value);
-                output.Flush();
-                Assert.AreEqual(data, rawOutput.ToArray());
-
-                // Also try computing size.
-                Assert.AreEqual(data.Length, CodedOutputStream.ComputeRawVarint64Size(value));
-            }
-
-            // Try different buffer sizes.
-            for (int bufferSize = 1; bufferSize <= 16; bufferSize *= 2)
-            {
-                // Only do 32-bit write if the value fits in 32 bits.
-                if ((value >> 32) == 0)
-                {
-                    MemoryStream rawOutput = new MemoryStream();
-                    CodedOutputStream output =
-                        new CodedOutputStream(rawOutput, bufferSize);
-                    output.WriteRawVarint32((uint) value);
-                    output.Flush();
-                    Assert.AreEqual(data, rawOutput.ToArray());
-                }
-
-                {
-                    MemoryStream rawOutput = new MemoryStream();
-                    CodedOutputStream output = new CodedOutputStream(rawOutput, bufferSize);
-                    output.WriteRawVarint64(value);
-                    output.Flush();
-                    Assert.AreEqual(data, rawOutput.ToArray());
-                }
-            }
-        }
-
-        /// <summary>
-        /// Tests WriteRawVarint32() and WriteRawVarint64()
-        /// </summary>
-        [Test]
-        public void WriteVarint()
-        {
-            AssertWriteVarint(new byte[] {0x00}, 0);
-            AssertWriteVarint(new byte[] {0x01}, 1);
-            AssertWriteVarint(new byte[] {0x7f}, 127);
-            // 14882
-            AssertWriteVarint(new byte[] {0xa2, 0x74}, (0x22 << 0) | (0x74 << 7));
-            // 2961488830
-            AssertWriteVarint(new byte[] {0xbe, 0xf7, 0x92, 0x84, 0x0b},
-                              (0x3e << 0) | (0x77 << 7) | (0x12 << 14) | (0x04 << 21) |
-                              (0x0bL << 28));
-
-            // 64-bit
-            // 7256456126
-            AssertWriteVarint(new byte[] {0xbe, 0xf7, 0x92, 0x84, 0x1b},
-                              (0x3e << 0) | (0x77 << 7) | (0x12 << 14) | (0x04 << 21) |
-                              (0x1bL << 28));
-            // 41256202580718336
-            AssertWriteVarint(
-                new byte[] {0x80, 0xe6, 0xeb, 0x9c, 0xc3, 0xc9, 0xa4, 0x49},
-                (0x00 << 0) | (0x66 << 7) | (0x6b << 14) | (0x1c << 21) |
-                (0x43UL << 28) | (0x49L << 35) | (0x24UL << 42) | (0x49UL << 49));
-            // 11964378330978735131
-            AssertWriteVarint(
-                new byte[] {0x9b, 0xa8, 0xf9, 0xc2, 0xbb, 0xd6, 0x80, 0x85, 0xa6, 0x01},
-                unchecked((ulong)
-                          ((0x1b << 0) | (0x28 << 7) | (0x79 << 14) | (0x42 << 21) |
-                           (0x3bL << 28) | (0x56L << 35) | (0x00L << 42) |
-                           (0x05L << 49) | (0x26L << 56) | (0x01L << 63))));
-        }
-
-        /// <summary>
-        /// Parses the given bytes using WriteRawLittleEndian32() and checks
-        /// that the result matches the given value.
-        /// </summary>
-        private static void AssertWriteLittleEndian32(byte[] data, uint value)
-        {
-            MemoryStream rawOutput = new MemoryStream();
-            CodedOutputStream output = new CodedOutputStream(rawOutput);
-            output.WriteRawLittleEndian32(value);
-            output.Flush();
-            Assert.AreEqual(data, rawOutput.ToArray());
-
-            // Try different buffer sizes.
-            for (int bufferSize = 1; bufferSize <= 16; bufferSize *= 2)
-            {
-                rawOutput = new MemoryStream();
-                output = new CodedOutputStream(rawOutput, bufferSize);
-                output.WriteRawLittleEndian32(value);
-                output.Flush();
-                Assert.AreEqual(data, rawOutput.ToArray());
-            }
-        }
-
-        /// <summary>
-        /// Parses the given bytes using WriteRawLittleEndian64() and checks
-        /// that the result matches the given value.
-        /// </summary>
-        private static void AssertWriteLittleEndian64(byte[] data, ulong value)
-        {
-            MemoryStream rawOutput = new MemoryStream();
-            CodedOutputStream output = new CodedOutputStream(rawOutput);
-            output.WriteRawLittleEndian64(value);
-            output.Flush();
-            Assert.AreEqual(data, rawOutput.ToArray());
-
-            // Try different block sizes.
-            for (int blockSize = 1; blockSize <= 16; blockSize *= 2)
-            {
-                rawOutput = new MemoryStream();
-                output = new CodedOutputStream(rawOutput, blockSize);
-                output.WriteRawLittleEndian64(value);
-                output.Flush();
-                Assert.AreEqual(data, rawOutput.ToArray());
-            }
-        }
-
-        /// <summary>
-        /// Tests writeRawLittleEndian32() and writeRawLittleEndian64().
-        /// </summary>
-        [Test]
-        public void WriteLittleEndian()
-        {
-            AssertWriteLittleEndian32(new byte[] {0x78, 0x56, 0x34, 0x12}, 0x12345678);
-            AssertWriteLittleEndian32(new byte[] {0xf0, 0xde, 0xbc, 0x9a}, 0x9abcdef0);
-
-            AssertWriteLittleEndian64(
-                new byte[] {0xf0, 0xde, 0xbc, 0x9a, 0x78, 0x56, 0x34, 0x12},
-                0x123456789abcdef0L);
-            AssertWriteLittleEndian64(
-                new byte[] {0x78, 0x56, 0x34, 0x12, 0xf0, 0xde, 0xbc, 0x9a},
-                0x9abcdef012345678UL);
-        }
-
-        [Test]
-        public void WriteWholeMessage_VaryingBlockSizes()
-        {
-            TestAllTypes message = SampleMessages.CreateFullTestAllTypes();
-
-            byte[] rawBytes = message.ToByteArray();
-
-            // Try different block sizes.
-            for (int blockSize = 1; blockSize < 256; blockSize *= 2)
-            {
-                MemoryStream rawOutput = new MemoryStream();
-                CodedOutputStream output = new CodedOutputStream(rawOutput, blockSize);
-                message.WriteTo(output);
-                output.Flush();
-                Assert.AreEqual(rawBytes, rawOutput.ToArray());
-            }
-        }
-        
-        [Test]
-        public void EncodeZigZag32()
-        {
-            Assert.AreEqual(0u, CodedOutputStream.EncodeZigZag32(0));
-            Assert.AreEqual(1u, CodedOutputStream.EncodeZigZag32(-1));
-            Assert.AreEqual(2u, CodedOutputStream.EncodeZigZag32(1));
-            Assert.AreEqual(3u, CodedOutputStream.EncodeZigZag32(-2));
-            Assert.AreEqual(0x7FFFFFFEu, CodedOutputStream.EncodeZigZag32(0x3FFFFFFF));
-            Assert.AreEqual(0x7FFFFFFFu, CodedOutputStream.EncodeZigZag32(unchecked((int) 0xC0000000)));
-            Assert.AreEqual(0xFFFFFFFEu, CodedOutputStream.EncodeZigZag32(0x7FFFFFFF));
-            Assert.AreEqual(0xFFFFFFFFu, CodedOutputStream.EncodeZigZag32(unchecked((int) 0x80000000)));
-        }
-
-        [Test]
-        public void EncodeZigZag64()
-        {
-            Assert.AreEqual(0u, CodedOutputStream.EncodeZigZag64(0));
-            Assert.AreEqual(1u, CodedOutputStream.EncodeZigZag64(-1));
-            Assert.AreEqual(2u, CodedOutputStream.EncodeZigZag64(1));
-            Assert.AreEqual(3u, CodedOutputStream.EncodeZigZag64(-2));
-            Assert.AreEqual(0x000000007FFFFFFEuL,
-                            CodedOutputStream.EncodeZigZag64(unchecked((long) 0x000000003FFFFFFFUL)));
-            Assert.AreEqual(0x000000007FFFFFFFuL,
-                            CodedOutputStream.EncodeZigZag64(unchecked((long) 0xFFFFFFFFC0000000UL)));
-            Assert.AreEqual(0x00000000FFFFFFFEuL,
-                            CodedOutputStream.EncodeZigZag64(unchecked((long) 0x000000007FFFFFFFUL)));
-            Assert.AreEqual(0x00000000FFFFFFFFuL,
-                            CodedOutputStream.EncodeZigZag64(unchecked((long) 0xFFFFFFFF80000000UL)));
-            Assert.AreEqual(0xFFFFFFFFFFFFFFFEL,
-                            CodedOutputStream.EncodeZigZag64(unchecked((long) 0x7FFFFFFFFFFFFFFFUL)));
-            Assert.AreEqual(0xFFFFFFFFFFFFFFFFL,
-                            CodedOutputStream.EncodeZigZag64(unchecked((long) 0x8000000000000000UL)));
-        }
-
-        [Test]
-        public void RoundTripZigZag32()
-        {
-            // Some easier-to-verify round-trip tests.  The inputs (other than 0, 1, -1)
-            // were chosen semi-randomly via keyboard bashing.
-            Assert.AreEqual(0, CodedInputStream.DecodeZigZag32(CodedOutputStream.EncodeZigZag32(0)));
-            Assert.AreEqual(1, CodedInputStream.DecodeZigZag32(CodedOutputStream.EncodeZigZag32(1)));
-            Assert.AreEqual(-1, CodedInputStream.DecodeZigZag32(CodedOutputStream.EncodeZigZag32(-1)));
-            Assert.AreEqual(14927, CodedInputStream.DecodeZigZag32(CodedOutputStream.EncodeZigZag32(14927)));
-            Assert.AreEqual(-3612, CodedInputStream.DecodeZigZag32(CodedOutputStream.EncodeZigZag32(-3612)));
-        }
-
-        [Test]
-        public void RoundTripZigZag64()
-        {
-            Assert.AreEqual(0, CodedInputStream.DecodeZigZag64(CodedOutputStream.EncodeZigZag64(0)));
-            Assert.AreEqual(1, CodedInputStream.DecodeZigZag64(CodedOutputStream.EncodeZigZag64(1)));
-            Assert.AreEqual(-1, CodedInputStream.DecodeZigZag64(CodedOutputStream.EncodeZigZag64(-1)));
-            Assert.AreEqual(14927, CodedInputStream.DecodeZigZag64(CodedOutputStream.EncodeZigZag64(14927)));
-            Assert.AreEqual(-3612, CodedInputStream.DecodeZigZag64(CodedOutputStream.EncodeZigZag64(-3612)));
-
-            Assert.AreEqual(856912304801416L,
-                            CodedInputStream.DecodeZigZag64(CodedOutputStream.EncodeZigZag64(856912304801416L)));
-            Assert.AreEqual(-75123905439571256L,
-                            CodedInputStream.DecodeZigZag64(CodedOutputStream.EncodeZigZag64(-75123905439571256L)));
-        }
-
-        [Test]
-        public void TestNegativeEnumNoTag()
-        {
-            Assert.AreEqual(10, CodedOutputStream.ComputeInt32Size(-2));
-            Assert.AreEqual(10, CodedOutputStream.ComputeEnumSize((int) SampleEnum.NegativeValue));
-
-            byte[] bytes = new byte[10];
-            CodedOutputStream output = new CodedOutputStream(bytes);
-            output.WriteEnum((int) SampleEnum.NegativeValue);
-
-            Assert.AreEqual(0, output.SpaceLeft);
-            Assert.AreEqual("FE-FF-FF-FF-FF-FF-FF-FF-FF-01", BitConverter.ToString(bytes));
-        }
-
-        [Test]
-        public void TestCodedInputOutputPosition()
-        {
-            byte[] content = new byte[110];
-            for (int i = 0; i < content.Length; i++)
-                content[i] = (byte)i;
-
-            byte[] child = new byte[120];
-            {
-                MemoryStream ms = new MemoryStream(child);
-                CodedOutputStream cout = new CodedOutputStream(ms, 20);
-                // Field 11: numeric value: 500
-                cout.WriteTag(11, WireFormat.WireType.Varint);
-                Assert.AreEqual(1, cout.Position);
-                cout.WriteInt32(500);
-                Assert.AreEqual(3, cout.Position);
-                //Field 12: length delimited 120 bytes
-                cout.WriteTag(12, WireFormat.WireType.LengthDelimited);
-                Assert.AreEqual(4, cout.Position);
-                cout.WriteBytes(ByteString.CopyFrom(content));
-                Assert.AreEqual(115, cout.Position);
-                // Field 13: fixed numeric value: 501
-                cout.WriteTag(13, WireFormat.WireType.Fixed32);
-                Assert.AreEqual(116, cout.Position);
-                cout.WriteSFixed32(501);
-                Assert.AreEqual(120, cout.Position);
-                cout.Flush();
-            }
-
-            byte[] bytes = new byte[130];
-            {
-                CodedOutputStream cout = new CodedOutputStream(bytes);
-                // Field 1: numeric value: 500
-                cout.WriteTag(1, WireFormat.WireType.Varint);
-                Assert.AreEqual(1, cout.Position);
-                cout.WriteInt32(500);
-                Assert.AreEqual(3, cout.Position);
-                //Field 2: length delimited 120 bytes
-                cout.WriteTag(2, WireFormat.WireType.LengthDelimited);
-                Assert.AreEqual(4, cout.Position);
-                cout.WriteBytes(ByteString.CopyFrom(child));
-                Assert.AreEqual(125, cout.Position);
-                // Field 3: fixed numeric value: 500
-                cout.WriteTag(3, WireFormat.WireType.Fixed32);
-                Assert.AreEqual(126, cout.Position);
-                cout.WriteSFixed32(501);
-                Assert.AreEqual(130, cout.Position);
-                cout.Flush();
-            }
-            // Now test Input stream:
-            {
-                CodedInputStream cin = new CodedInputStream(new MemoryStream(bytes), new byte[50], 0, 0);
-                Assert.AreEqual(0, cin.Position);
-                // Field 1:
-                uint tag = cin.ReadTag();
-                Assert.AreEqual(1, tag >> 3);
-                Assert.AreEqual(1, cin.Position);
-                Assert.AreEqual(500, cin.ReadInt32());
-                Assert.AreEqual(3, cin.Position);
-                //Field 2:
-                tag = cin.ReadTag();
-                Assert.AreEqual(2, tag >> 3);
-                Assert.AreEqual(4, cin.Position);
-                int childlen = cin.ReadLength();
-                Assert.AreEqual(120, childlen);
-                Assert.AreEqual(5, cin.Position);
-                int oldlimit = cin.PushLimit((int)childlen);
-                Assert.AreEqual(5, cin.Position);
-                // Now we are reading child message
-                {
-                    // Field 11: numeric value: 500
-                    tag = cin.ReadTag();
-                    Assert.AreEqual(11, tag >> 3);
-                    Assert.AreEqual(6, cin.Position);
-                    Assert.AreEqual(500, cin.ReadInt32());
-                    Assert.AreEqual(8, cin.Position);
-                    //Field 12: length delimited 120 bytes
-                    tag = cin.ReadTag();
-                    Assert.AreEqual(12, tag >> 3);
-                    Assert.AreEqual(9, cin.Position);
-                    ByteString bstr = cin.ReadBytes();
-                    Assert.AreEqual(110, bstr.Length);
-                    Assert.AreEqual((byte) 109, bstr[109]);
-                    Assert.AreEqual(120, cin.Position);
-                    // Field 13: fixed numeric value: 501
-                    tag = cin.ReadTag();
-                    Assert.AreEqual(13, tag >> 3);
-                    // ROK - Previously broken here, this returned 126 failing to account for bufferSizeAfterLimit
-                    Assert.AreEqual(121, cin.Position);
-                    Assert.AreEqual(501, cin.ReadSFixed32());
-                    Assert.AreEqual(125, cin.Position);
-                    Assert.IsTrue(cin.IsAtEnd);
-                }
-                cin.PopLimit(oldlimit);
-                Assert.AreEqual(125, cin.Position);
-                // Field 3: fixed numeric value: 501
-                tag = cin.ReadTag();
-                Assert.AreEqual(3, tag >> 3);
-                Assert.AreEqual(126, cin.Position);
-                Assert.AreEqual(501, cin.ReadSFixed32());
-                Assert.AreEqual(130, cin.Position);
-                Assert.IsTrue(cin.IsAtEnd);
-            }
-        }
-    }
-}