Crisis.Ionic.Zip.ZipEntry.ProcessExtraFieldUnixTimes C# (CSharp) Method

        private int ProcessExtraFieldUnixTimes(byte[] buffer, int j, Int16 dataSize, long posn)
        {
            // The Unix filetimes are 32-bit unsigned integers,
            // storing seconds since Unix epoch.

            if (dataSize != 13 && dataSize != 9 && dataSize != 5)
                throw new BadReadException(String.Format("  Unexpected size (0x{0:X4}) for Extended Timestamp extra field at position 0x{1:X16}", dataSize, posn));

            int remainingData = dataSize;

            var slurp = new Func<DateTime>( () => {
                    Int32 timet = BitConverter.ToInt32(buffer, j);
                    j += 4;
                    remainingData -= 4;
                    return _unixEpoch.AddSeconds(timet);
                });

            if (dataSize == 13 || _readExtraDepth > 0)
            {
                byte flag = buffer[j++];
                remainingData--;

                if ((flag & 0x0001) != 0 && remainingData >= 4)
                    this._Mtime = slurp();

                 this._Atime = ((flag & 0x0002) != 0 && remainingData >= 4)
                     ? slurp()
                     : DateTime.UtcNow;

                 this._Ctime =  ((flag & 0x0004) != 0 && remainingData >= 4)
                     ? slurp()
                     :DateTime.UtcNow;

                _timestamp |= ZipEntryTimestamp.Unix;
                _ntfsTimesAreSet = true;
                _emitUnixTimes = true;
            }
            else
                ReadExtraField(); // will recurse

            return j;
        }