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[C#] fix parse failure for extensions with large field numbers #9591

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merged 3 commits into from Mar 7, 2022
Merged

[C#] fix parse failure for extensions with large field numbers #9591

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84e945b
test: add tests for a large field number
homuler Mar 6, 2022
8751981
fix: cast to uint after shifting
homuler Mar 6, 2022
355b7ce
remove an unnecessary test case
homuler Mar 7, 2022
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19 changes: 19 additions & 0 deletions csharp/src/Google.Protobuf.Test/CodedInputStreamTest.cs
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Expand Up @@ -716,6 +716,25 @@ public void TestSlowPathAvoidance()
}
}

[Test]
public void MaximumFieldNumber()
{
MemoryStream ms = new MemoryStream();
CodedOutputStream output = new CodedOutputStream(ms);

int fieldNumber = 0x1FFFFFFF;
uint tag = WireFormat.MakeTag(fieldNumber, WireFormat.WireType.LengthDelimited);
output.WriteRawVarint32(tag);
output.WriteString("field 1");
output.Flush();
ms.Position = 0;

CodedInputStream input = new CodedInputStream(ms);

Assert.AreEqual(tag, input.ReadTag());
Assert.AreEqual(fieldNumber, WireFormat.GetTagFieldNumber(tag));
}

[Test]
public void Tag0Throws()
{
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2 changes: 1 addition & 1 deletion csharp/src/Google.Protobuf/WireFormat.cs
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Expand Up @@ -90,7 +90,7 @@ public static WireType GetTagWireType(uint tag)
/// </summary>
public static int GetTagFieldNumber(uint tag)
{
return (int) tag >> TagTypeBits;
return (int) (tag >> TagTypeBits);
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Ouch, that was a subtle bug. Thanks for catching it.

}

/// <summary>
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