C# CodedOutputStream.WriteTag方法代码示例

        public void MapNonContiguousEntries()
        {
            var memoryStream = new MemoryStream();
            var output = new CodedOutputStream(memoryStream);

            // Message structure:
            // Entry for MapInt32Int32
            // Entry for MapStringString
            // Entry for MapInt32Int32

            // First entry
            var key1 = 10;
            var value1 = 20;
            output.WriteTag(TestMap.MapInt32Int32FieldNumber, WireFormat.WireType.LengthDelimited);
            output.WriteLength(4);
            output.WriteTag(1, WireFormat.WireType.Varint);
            output.WriteInt32(key1);
            output.WriteTag(2, WireFormat.WireType.Varint);
            output.WriteInt32(value1);

            // Second entry
            var key2 = "a";
            var value2 = "b";
            output.WriteTag(TestMap.MapStringStringFieldNumber, WireFormat.WireType.LengthDelimited);
            output.WriteLength(6); // 3 bytes per entry: tag, size, character
            output.WriteTag(1, WireFormat.WireType.LengthDelimited);
            output.WriteString(key2);
            output.WriteTag(2, WireFormat.WireType.LengthDelimited);
            output.WriteString(value2);

            // Third entry
            var key3 = 15;
            var value3 = 25;
            output.WriteTag(TestMap.MapInt32Int32FieldNumber, WireFormat.WireType.LengthDelimited);
            output.WriteLength(4);
            output.WriteTag(1, WireFormat.WireType.Varint);
            output.WriteInt32(key3);
            output.WriteTag(2, WireFormat.WireType.Varint);
            output.WriteInt32(value3);

            output.Flush();
            var parsed = TestMap.Parser.ParseFrom(memoryStream.ToArray());
            var expected = new TestMap
            {
                MapInt32Int32 = { { key1, value1 }, { key3, value3 } },
                MapStringString = { { key2, value2 } }
            };
            Assert.AreEqual(expected, parsed);
        }

        public void MapIgnoresExtraFieldsWithinEntryMessages()
        {
            // Hand-craft the stream to contain a single entry with three fields
            var memoryStream = new MemoryStream();
            var output = new CodedOutputStream(memoryStream);

            output.WriteTag(TestMap.MapInt32Int32FieldNumber, WireFormat.WireType.LengthDelimited);

            var key = 10; // Field 1 
            var value = 20; // Field 2
            var extra = 30; // Field 3

            // Each field can be represented in a single byte, with a single byte tag.
            // Total message size: 6 bytes.
            output.WriteLength(6);
            output.WriteTag(1, WireFormat.WireType.Varint);
            output.WriteInt32(key);
            output.WriteTag(2, WireFormat.WireType.Varint);
            output.WriteInt32(value);
            output.WriteTag(3, WireFormat.WireType.Varint);
            output.WriteInt32(extra);
            output.Flush();

            var parsed = TestMap.Parser.ParseFrom(memoryStream.ToArray());
            Assert.AreEqual(value, parsed.MapInt32Int32[key]);
        }

        public void MapFieldOrderIsIrrelevant()
        {
            var memoryStream = new MemoryStream();
            var output = new CodedOutputStream(memoryStream);

            output.WriteTag(TestMap.MapInt32Int32FieldNumber, WireFormat.WireType.LengthDelimited);

            var key = 10;
            var value = 20;

            // Each field can be represented in a single byte, with a single byte tag.
            // Total message size: 4 bytes.
            output.WriteLength(4);
            output.WriteTag(2, WireFormat.WireType.Varint);
            output.WriteInt32(value);
            output.WriteTag(1, WireFormat.WireType.Varint);
            output.WriteInt32(key);
            output.Flush();

            var parsed = TestMap.Parser.ParseFrom(memoryStream.ToArray());
            Assert.AreEqual(value, parsed.MapInt32Int32[key]);
        }

        public void ExtraEndGroupThrows()
        {
            var message = SampleMessages.CreateFullTestAllTypes();
            var stream = new MemoryStream();
            var output = new CodedOutputStream(stream);

            output.WriteTag(TestAllTypes.SingleFixed32FieldNumber, WireFormat.WireType.Fixed32);
            output.WriteFixed32(123);
            output.WriteTag(100, WireFormat.WireType.EndGroup);

            output.Flush();

            stream.Position = 0;
            Assert.Throws<InvalidProtocolBufferException>(() => TestAllTypes.Parser.ParseFrom(stream));
        }

        public void MapWithOnlyValue()
        {
            // Hand-craft the stream to contain a single entry with just a value.
            var memoryStream = new MemoryStream();
            var output = new CodedOutputStream(memoryStream);
            output.WriteTag(TestMap.MapInt32ForeignMessageFieldNumber, WireFormat.WireType.LengthDelimited);
            var nestedMessage = new ForeignMessage { C = 20 };
            // Size of the entry (tag, size written by WriteMessage, data written by WriteMessage)
            output.WriteLength(2 + nestedMessage.CalculateSize());
            output.WriteTag(2, WireFormat.WireType.LengthDelimited);
            output.WriteMessage(nestedMessage);
            output.Flush();

            var parsed = TestMap.Parser.ParseFrom(memoryStream.ToArray());
            Assert.AreEqual(nestedMessage, parsed.MapInt32ForeignMessage[0]);
        }

        private byte[] IntToByteBuffer(int i)
        {
            int t = CodedOutputStream.ComputeTagSize(5);
            int s = CodedOutputStream.ComputeInt32Size(i);

            s += t;
            byte[] bytes = new byte[s];
            CodedOutputStream cos = new CodedOutputStream(bytes);
            cos.WriteTag((5 << 3) + 0);
            cos.WriteInt32(i);
            cos.Flush();
            return bytes;
        }

        public void MapWithOnlyKey_MessageValue()
        {
            // Hand-craft the stream to contain a single entry with just a key.
            var memoryStream = new MemoryStream();
            var output = new CodedOutputStream(memoryStream);
            output.WriteTag(TestMap.MapInt32ForeignMessageFieldNumber, WireFormat.WireType.LengthDelimited);
            int key = 10;
            output.WriteLength(1 + CodedOutputStream.ComputeInt32Size(key));
            output.WriteTag(1, WireFormat.WireType.Varint);
            output.WriteInt32(key);
            output.Flush();

            var parsed = TestMap.Parser.ParseFrom(memoryStream.ToArray());
            Assert.AreEqual(new ForeignMessage(), parsed.MapInt32ForeignMessage[key]);
        }

        public void SkipGroup_WrongEndGroupTag()
        {
            // Create an output stream with:
            // Field 1: string "field 1"
            // Start group 2
            //   Field 3: fixed int32
            // End group 4 (should give an error)
            var stream = new MemoryStream();
            var output = new CodedOutputStream(stream);
            output.WriteTag(1, WireFormat.WireType.LengthDelimited);
            output.WriteString("field 1");

            // The outer group...
            output.WriteTag(2, WireFormat.WireType.StartGroup);
            output.WriteTag(3, WireFormat.WireType.Fixed32);
            output.WriteFixed32(100);
            output.WriteTag(4, WireFormat.WireType.EndGroup);
            output.Flush();
            stream.Position = 0;

            // Now act like a generated client
            var input = new CodedInputStream(stream);
            Assert.AreEqual(WireFormat.MakeTag(1, WireFormat.WireType.LengthDelimited), input.ReadTag());
            Assert.AreEqual("field 1", input.ReadString());
            Assert.AreEqual(WireFormat.MakeTag(2, WireFormat.WireType.StartGroup), input.ReadTag());
            Assert.Throws<InvalidProtocolBufferException>(input.SkipLastField);
        }

        public void TestSlowPathAvoidance()
        {
            using (var ms = new MemoryStream())
            {
                CodedOutputStream output = new CodedOutputStream(ms);
                output.WriteTag(1, WireFormat.WireType.LengthDelimited);
                output.WriteBytes(ByteString.CopyFrom(new byte[100]));
                output.WriteTag(2, WireFormat.WireType.LengthDelimited);
                output.WriteBytes(ByteString.CopyFrom(new byte[100]));
                output.Flush();

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

                uint tag = input.ReadTag();
                Assert.AreEqual(1, WireFormat.GetTagFieldNumber(tag));
                Assert.AreEqual(100, input.ReadBytes().Length);

                tag = input.ReadTag();
                Assert.AreEqual(2, WireFormat.GetTagFieldNumber(tag));
                Assert.AreEqual(100, input.ReadBytes().Length);
            }
        }

        public void RogueEndGroupTag()
        {
            // If we have an end-group tag without a leading start-group tag, generated
            // code will just call SkipLastField... so that should fail.

            var stream = new MemoryStream();
            var output = new CodedOutputStream(stream);
            output.WriteTag(1, WireFormat.WireType.EndGroup);
            output.Flush();
            stream.Position = 0;

            var input = new CodedInputStream(stream);
            Assert.AreEqual(WireFormat.MakeTag(1, WireFormat.WireType.EndGroup), input.ReadTag());
            Assert.Throws<InvalidProtocolBufferException>(input.SkipLastField);
        }

        public void SkipGroup()
        {
            // Create an output stream with a group in:
            // Field 1: string "field 1"
            // Field 2: group containing:
            //   Field 1: fixed int32 value 100
            //   Field 2: string "ignore me"
            //   Field 3: nested group containing
            //      Field 1: fixed int64 value 1000
            // Field 3: string "field 3"
            var stream = new MemoryStream();
            var output = new CodedOutputStream(stream);
            output.WriteTag(1, WireFormat.WireType.LengthDelimited);
            output.WriteString("field 1");

            // The outer group...
            output.WriteTag(2, WireFormat.WireType.StartGroup);
            output.WriteTag(1, WireFormat.WireType.Fixed32);
            output.WriteFixed32(100);
            output.WriteTag(2, WireFormat.WireType.LengthDelimited);
            output.WriteString("ignore me");
            // The nested group...
            output.WriteTag(3, WireFormat.WireType.StartGroup);
            output.WriteTag(1, WireFormat.WireType.Fixed64);
            output.WriteFixed64(1000);
            // Note: Not sure the field number is relevant for end group...
            output.WriteTag(3, WireFormat.WireType.EndGroup);

            // End the outer group
            output.WriteTag(2, WireFormat.WireType.EndGroup);

            output.WriteTag(3, WireFormat.WireType.LengthDelimited);
            output.WriteString("field 3");
            output.Flush();
            stream.Position = 0;

            // Now act like a generated client
            var input = new CodedInputStream(stream);
            Assert.AreEqual(WireFormat.MakeTag(1, WireFormat.WireType.LengthDelimited), input.ReadTag());
            Assert.AreEqual("field 1", input.ReadString());
            Assert.AreEqual(WireFormat.MakeTag(2, WireFormat.WireType.StartGroup), input.ReadTag());
            input.SkipLastField(); // Should consume the whole group, including the nested one.
            Assert.AreEqual(WireFormat.MakeTag(3, WireFormat.WireType.LengthDelimited), input.ReadTag());
            Assert.AreEqual("field 3", input.ReadString());
        }

        public void RecursionLimitAppliedWhileSkippingGroup()
        {
            var stream = new MemoryStream();
            var output = new CodedOutputStream(stream);
            for (int i = 0; i < CodedInputStream.DefaultRecursionLimit + 1; i++)
            {
                output.WriteTag(1, WireFormat.WireType.StartGroup);
            }
            for (int i = 0; i < CodedInputStream.DefaultRecursionLimit + 1; i++)
            {
                output.WriteTag(1, WireFormat.WireType.EndGroup);
            }
            output.Flush();
            stream.Position = 0;

            // Now act like a generated client
            var input = new CodedInputStream(stream);
            Assert.AreEqual(WireFormat.MakeTag(1, WireFormat.WireType.StartGroup), input.ReadTag());
            Assert.Throws<InvalidProtocolBufferException>(input.SkipLastField);
        }

        public void ExtraEndGroupSkipped()
        {
            var message = SampleMessages.CreateFullTestAllTypes();
            var stream = new MemoryStream();
            var output = new CodedOutputStream(stream);

            output.WriteTag(100, WireFormat.WireType.EndGroup);
            output.WriteTag(TestAllTypes.SingleFixed32FieldNumber, WireFormat.WireType.Fixed32);
            output.WriteFixed32(123);

            output.Flush();

            stream.Position = 0;
            var parsed = TestAllTypes.Parser.ParseFrom(stream);
            Assert.AreEqual(new TestAllTypes { SingleFixed32 = 123 }, parsed);
        }

        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);
//.........这里部分代码省略.........

        public void DuplicateKeys_LastEntryWins()
        {
            var memoryStream = new MemoryStream();
            var output = new CodedOutputStream(memoryStream);

            var key = 10;
            var value1 = 20;
            var value2 = 30;

            // First entry
            output.WriteTag(TestMap.MapInt32Int32FieldNumber, WireFormat.WireType.LengthDelimited);
            output.WriteLength(4);
            output.WriteTag(1, WireFormat.WireType.Varint);
            output.WriteInt32(key);
            output.WriteTag(2, WireFormat.WireType.Varint);
            output.WriteInt32(value1);

            // Second entry - same key, different value
            output.WriteTag(TestMap.MapInt32Int32FieldNumber, WireFormat.WireType.LengthDelimited);
            output.WriteLength(4);
            output.WriteTag(1, WireFormat.WireType.Varint);
            output.WriteInt32(key);
            output.WriteTag(2, WireFormat.WireType.Varint);
            output.WriteInt32(value2);
            output.Flush();

            var parsed = TestMap.Parser.ParseFrom(memoryStream.ToArray());
            Assert.AreEqual(value2, parsed.MapInt32Int32[key]);
        }