Fix conformance test failures for Google.Protobuf

conformance/failure_list_csharp.txt

-Recommended.Proto2.ProtobufInput.ValidDataRepeated.BOOL.PackedInput.PackedOutput.ProtobufOutput
-Recommended.Proto2.ProtobufInput.ValidDataRepeated.BOOL.PackedInput.UnpackedOutput.ProtobufOutput
-Recommended.Proto2.ProtobufInput.ValidDataRepeated.BOOL.UnpackedInput.DefaultOutput.ProtobufOutput
-Recommended.Proto2.ProtobufInput.ValidDataRepeated.BOOL.UnpackedInput.PackedOutput.ProtobufOutput
-Recommended.Proto2.ProtobufInput.ValidDataRepeated.BOOL.UnpackedInput.UnpackedOutput.ProtobufOutput
-Recommended.Proto2.ProtobufInput.ValidDataScalarBinary.BOOL[4].ProtobufOutput
-Recommended.Proto2.ProtobufInput.ValidDataScalarBinary.BOOL[6].ProtobufOutput
-Recommended.Proto3.ProtobufInput.ValidDataRepeated.BOOL.PackedInput.DefaultOutput.ProtobufOutput
-Recommended.Proto3.ProtobufInput.ValidDataRepeated.BOOL.PackedInput.PackedOutput.ProtobufOutput
-Recommended.Proto3.ProtobufInput.ValidDataRepeated.BOOL.PackedInput.UnpackedOutput.ProtobufOutput
-Recommended.Proto3.ProtobufInput.ValidDataRepeated.BOOL.UnpackedInput.DefaultOutput.ProtobufOutput
-Recommended.Proto3.ProtobufInput.ValidDataRepeated.BOOL.UnpackedInput.PackedOutput.ProtobufOutput
-Recommended.Proto3.ProtobufInput.ValidDataRepeated.BOOL.UnpackedInput.UnpackedOutput.ProtobufOutput
-Recommended.Proto3.ProtobufInput.ValidDataScalarBinary.BOOL[4].ProtobufOutput
-Recommended.Proto3.ProtobufInput.ValidDataScalarBinary.BOOL[6].ProtobufOutput
-Required.Proto2.ProtobufInput.RepeatedScalarSelectsLast.BOOL.ProtobufOutput
-Required.Proto2.ProtobufInput.ValidDataRepeated.BOOL.PackedInput.ProtobufOutput
-Required.Proto2.ProtobufInput.ValidDataRepeated.BOOL.UnpackedInput.ProtobufOutput
-Required.Proto2.ProtobufInput.ValidDataScalar.BOOL[4].ProtobufOutput
-Required.Proto2.ProtobufInput.ValidDataScalar.BOOL[6].ProtobufOutput
-Required.Proto3.ProtobufInput.RepeatedScalarSelectsLast.BOOL.JsonOutput
-Required.Proto3.ProtobufInput.RepeatedScalarSelectsLast.BOOL.ProtobufOutput
-Required.Proto3.ProtobufInput.ValidDataRepeated.BOOL.PackedInput.JsonOutput
-Required.Proto3.ProtobufInput.ValidDataRepeated.BOOL.PackedInput.ProtobufOutput
-Required.Proto3.ProtobufInput.ValidDataRepeated.BOOL.UnpackedInput.JsonOutput
-Required.Proto3.ProtobufInput.ValidDataRepeated.BOOL.UnpackedInput.ProtobufOutput
-Required.Proto3.ProtobufInput.ValidDataScalar.BOOL[4].JsonOutput
-Required.Proto3.ProtobufInput.ValidDataScalar.BOOL[4].ProtobufOutput
-Required.Proto3.ProtobufInput.ValidDataScalar.BOOL[6].JsonOutput
-Required.Proto3.ProtobufInput.ValidDataScalar.BOOL[6].ProtobufOutput
-Recommended.Proto2.ProtobufInput.ValidDataRepeated.BOOL.PackedInput.DefaultOutput.ProtobufOutput
 Recommended.Proto3.JsonInput.BytesFieldBase64Url.JsonOutput
 Recommended.Proto3.JsonInput.BytesFieldBase64Url.ProtobufOutput

csharp/src/Google.Protobuf/CodedInputStream.cs

@@ -577,7 +577,32 @@ namespace Google.Protobuf
         /// </summary>
         public bool ReadBool()
         {
-            return ReadRawVarint32() != 0;
+            int result = 0; // can't do AND on bytes, it gets implicitly upcasted to int
+            byte index = 0;
+            if (bufferPos < bufferSize) // check if we have at least one byte for the most likely case of a one byte 1 or 0
+            {
+                result = buffer[bufferPos++];
+                if (result < 128)
+                {
+                    return result != 0;
+                }
+                result &= 0x7f;
+                index++;
+            }
+
+            do
+            {
+                byte b = ReadRawByte();
+                result |= b & 0x7F; // OR all bytes together since we don't care about the actual value, just whether is more than zero
+                if (b < 0x80)
+                {
+                    return result != 0;
+                }
+                index++;
+            }
+            while (index < 10);
+
+            throw InvalidProtocolBufferException.MalformedVarint();
         }
 
         /// <summary>