using System.IO; // Protocol Buffers - Google's data interchange format // Copyright 2008 Google Inc. // http://code.google.com/p/protobuf/ // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. using Google.ProtocolBuffers.TestProtos; using NUnit.Framework; namespace Google.ProtocolBuffers { [TestFixture] public class CodedOutputStreamTest { /// /// 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. /// 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; } private static void AssertEqualBytes(byte[] a, byte[] b) { Assert.AreEqual(ByteString.CopyFrom(a), ByteString.CopyFrom(b)); } /// /// Writes the given value using WriteRawVarint32() and WriteRawVarint64() and /// checks that the result matches the given bytes /// 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 = CodedOutputStream.CreateInstance(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 = CodedOutputStream.CreateInstance(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 = CodedOutputStream.CreateInstance(rawOutput, bufferSize); output.WriteRawVarint32((uint) value); output.Flush(); Assert.AreEqual(data, rawOutput.ToArray()); } { MemoryStream rawOutput = new MemoryStream(); CodedOutputStream output = CodedOutputStream.CreateInstance(rawOutput, bufferSize); output.WriteRawVarint64(value); output.Flush(); Assert.AreEqual(data, rawOutput.ToArray()); } } } /// /// Tests WriteRawVarint32() and WriteRawVarint64() /// [Test] public void WriteVarint() { AssertWriteVarint(Bytes(0x00), 0); AssertWriteVarint(Bytes(0x01), 1); AssertWriteVarint(Bytes(0x7f), 127); // 14882 AssertWriteVarint(Bytes(0xa2, 0x74), (0x22 << 0) | (0x74 << 7)); // 2961488830 AssertWriteVarint(Bytes(0xbe, 0xf7, 0x92, 0x84, 0x0b), (0x3e << 0) | (0x77 << 7) | (0x12 << 14) | (0x04 << 21) | (0x0bL << 28)); // 64-bit // 7256456126 AssertWriteVarint(Bytes(0xbe, 0xf7, 0x92, 0x84, 0x1b), (0x3e << 0) | (0x77 << 7) | (0x12 << 14) | (0x04 << 21) | (0x1bL << 28)); // 41256202580718336 AssertWriteVarint( Bytes(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( Bytes(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)))); } /// /// Parses the given bytes using WriteRawLittleEndian32() and checks /// that the result matches the given value. /// private static void AssertWriteLittleEndian32(byte[] data, uint value) { MemoryStream rawOutput = new MemoryStream(); CodedOutputStream output = CodedOutputStream.CreateInstance(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 = CodedOutputStream.CreateInstance(rawOutput, bufferSize); output.WriteRawLittleEndian32(value); output.Flush(); Assert.AreEqual(data, rawOutput.ToArray()); } } /// /// Parses the given bytes using WriteRawLittleEndian64() and checks /// that the result matches the given value. /// private static void AssertWriteLittleEndian64(byte[] data, ulong value) { MemoryStream rawOutput = new MemoryStream(); CodedOutputStream output = CodedOutputStream.CreateInstance(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 = CodedOutputStream.CreateInstance(rawOutput, blockSize); output.WriteRawLittleEndian64(value); output.Flush(); Assert.AreEqual(data, rawOutput.ToArray()); } } /// /// Tests writeRawLittleEndian32() and writeRawLittleEndian64(). /// [Test] public void WriteLittleEndian() { AssertWriteLittleEndian32(Bytes(0x78, 0x56, 0x34, 0x12), 0x12345678); AssertWriteLittleEndian32(Bytes(0xf0, 0xde, 0xbc, 0x9a), 0x9abcdef0); AssertWriteLittleEndian64( Bytes(0xf0, 0xde, 0xbc, 0x9a, 0x78, 0x56, 0x34, 0x12), 0x123456789abcdef0L); AssertWriteLittleEndian64( Bytes(0x78, 0x56, 0x34, 0x12, 0xf0, 0xde, 0xbc, 0x9a), 0x9abcdef012345678UL); } [Test] public void WriteWholeMessage() { TestAllTypes message = TestUtil.GetAllSet(); byte[] rawBytes = message.ToByteArray(); AssertEqualBytes(TestUtil.GoldenMessage.ToByteArray(), rawBytes); // Try different block sizes. for (int blockSize = 1; blockSize < 256; blockSize *= 2) { MemoryStream rawOutput = new MemoryStream(); CodedOutputStream output = CodedOutputStream.CreateInstance(rawOutput, blockSize); message.WriteTo(output); output.Flush(); AssertEqualBytes(rawBytes, rawOutput.ToArray()); } } [Test] public void EncodeZigZag32() { Assert.AreEqual(0, CodedOutputStream.EncodeZigZag32( 0)); Assert.AreEqual(1, CodedOutputStream.EncodeZigZag32(-1)); Assert.AreEqual(2, CodedOutputStream.EncodeZigZag32( 1)); Assert.AreEqual(3, CodedOutputStream.EncodeZigZag32(-2)); Assert.AreEqual(0x7FFFFFFE, CodedOutputStream.EncodeZigZag32(0x3FFFFFFF)); Assert.AreEqual(0x7FFFFFFF, CodedOutputStream.EncodeZigZag32(unchecked((int)0xC0000000))); Assert.AreEqual(0xFFFFFFFE, CodedOutputStream.EncodeZigZag32(0x7FFFFFFF)); Assert.AreEqual(0xFFFFFFFF, CodedOutputStream.EncodeZigZag32(unchecked((int)0x80000000))); } [Test] public void EncodeZigZag64() { Assert.AreEqual(0, CodedOutputStream.EncodeZigZag64( 0)); Assert.AreEqual(1, CodedOutputStream.EncodeZigZag64(-1)); Assert.AreEqual(2, CodedOutputStream.EncodeZigZag64( 1)); Assert.AreEqual(3, CodedOutputStream.EncodeZigZag64(-2)); Assert.AreEqual(0x000000007FFFFFFEL, CodedOutputStream.EncodeZigZag64(unchecked((long)0x000000003FFFFFFFUL))); Assert.AreEqual(0x000000007FFFFFFFL, CodedOutputStream.EncodeZigZag64(unchecked((long)0xFFFFFFFFC0000000UL))); Assert.AreEqual(0x00000000FFFFFFFEL, CodedOutputStream.EncodeZigZag64(unchecked((long)0x000000007FFFFFFFUL))); Assert.AreEqual(0x00000000FFFFFFFFL, 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))); } } }