From 9df2defa295e1a3b315ed2a88791db51ff1f53e7 Mon Sep 17 00:00:00 2001
From: Jon Skeet <jonskeet@google.com>
Date: Tue, 4 Aug 2015 11:26:48 +0100
Subject: Consume unknown fields when parsing.

This is expected to be the cause of the conformance test failures.
Generated code in next commit.
---
 csharp/src/Google.Protobuf/CodedInputStream.cs | 33 ++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'csharp/src/Google.Protobuf/CodedInputStream.cs')

diff --git a/csharp/src/Google.Protobuf/CodedInputStream.cs b/csharp/src/Google.Protobuf/CodedInputStream.cs
index a1abfcb0..fee31e3b 100644
--- a/csharp/src/Google.Protobuf/CodedInputStream.cs
+++ b/csharp/src/Google.Protobuf/CodedInputStream.cs
@@ -308,6 +308,39 @@ namespace Google.Protobuf
             return true;
         }
 
+        /// <summary>
+        /// Consumes the data for the field with the tag we've just read.
+        /// This should be called directly after <see cref="ReadTag"/>, when
+        /// the caller wishes to skip an unknown field.
+        /// </summary>
+        public void ConsumeLastField()
+        {
+            if (lastTag == 0)
+            {
+                throw new InvalidOperationException("ConsumeLastField cannot be called at the end of a stream");
+            }
+            switch (WireFormat.GetTagWireType(lastTag))
+            {
+                case WireFormat.WireType.StartGroup:
+                case WireFormat.WireType.EndGroup:
+                    // TODO: Work out how to skip them instead? See issue 688.
+                    throw new InvalidProtocolBufferException("Group tags not supported by proto3 C# implementation");
+                case WireFormat.WireType.Fixed32:
+                    ReadFixed32();
+                    break;
+                case WireFormat.WireType.Fixed64:
+                    ReadFixed64();
+                    break;
+                case WireFormat.WireType.LengthDelimited:
+                    var length = ReadLength();
+                    SkipRawBytes(length);
+                    break;
+                case WireFormat.WireType.Varint:
+                    ReadRawVarint32();
+                    break;
+            }
+        }
+
         /// <summary>
         /// Reads a double field from the stream.
         /// </summary>
-- 
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