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namespace Google.ProtocolBuffers {
public sealed class CodedInputStream {
/// <summary>
/// Decode a 32-bit value with ZigZag encoding.
/// </summary>
/// <remarks>
/// ZigZag encodes signed integers into values that can be efficiently
/// encoded with varint. (Otherwise, negative values must be
/// sign-extended to 64 bits to be varint encoded, thus always taking
/// 10 bytes on the wire.)
/// </remarks>
public static int DecodeZigZag32(uint n) {
return (int)(n >> 1) ^ -(int)(n & 1);
}
/// <summary>
/// Decode a 32-bit value with ZigZag encoding.
/// </summary>
/// <remarks>
/// ZigZag encodes signed integers into values that can be efficiently
/// encoded with varint. (Otherwise, negative values must be
/// sign-extended to 64 bits to be varint encoded, thus always taking
/// 10 bytes on the wire.)
/// </remarks>
public static long DecodeZigZag64(ulong n) {
return (long)(n >> 1) ^ -(long)(n & 1);
}
}
}
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