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, ParsingPrimitives.DecodeZigZag32(WritingPrimitives.EncodeZigZag32(0)));
Assert.AreEqual(1, ParsingPrimitives.DecodeZigZag32(WritingPrimitives.EncodeZigZag32(1)));
Assert.AreEqual(-1, ParsingPrimitives.DecodeZigZag32(WritingPrimitives.EncodeZigZag32(-1)));
Assert.AreEqual(14927, ParsingPrimitives.DecodeZigZag32(WritingPrimitives.EncodeZigZag32(14927)));
Assert.AreEqual(-3612, ParsingPrimitives.DecodeZigZag32(WritingPrimitives.EncodeZigZag32(-3612)));
}
public void EncodeZigZag32()
{
Assert.AreEqual(0u, WritingPrimitives.EncodeZigZag32(0));
Assert.AreEqual(1u, WritingPrimitives.EncodeZigZag32(-1));
Assert.AreEqual(2u, WritingPrimitives.EncodeZigZag32(1));
Assert.AreEqual(3u, WritingPrimitives.EncodeZigZag32(-2));
Assert.AreEqual(0x7FFFFFFEu, WritingPrimitives.EncodeZigZag32(0x3FFFFFFF));
Assert.AreEqual(0x7FFFFFFFu, WritingPrimitives.EncodeZigZag32(unchecked ((int)0xC0000000)));
Assert.AreEqual(0xFFFFFFFEu, WritingPrimitives.EncodeZigZag32(0x7FFFFFFF));
Assert.AreEqual(0xFFFFFFFFu, WritingPrimitives.EncodeZigZag32(unchecked ((int)0x80000000)));
}
/// <summary>
/// Computes the number of bytes that would be needed to encode an
/// sint32 field, including the tag.
/// </summary>
public static int ComputeSInt32Size(int value)
{
return(ComputeRawVarint32Size(WritingPrimitives.EncodeZigZag32(value)));
}
