Pchp.Library.Streams.PhpStream.SeekInternal C# (CSharp) Method

        internal bool SeekInternal(int offset, int current, SeekOrigin whence)
        {
            try
            {
                if (!CanSeek)
                {
                    PhpException.Throw(PhpError.Warning, ErrResources.wrapper_op_unsupported, "Seek");
                    return false;
                }

                if (!RawSeek(offset, whence)) return false;
                int expectedOffset = 0, absoluteOffset = RawTell();

                switch (whence)
                {
                    case SeekOrigin.Begin:
                        expectedOffset = offset;
                        break;
                    case SeekOrigin.Current:
                        expectedOffset = current + offset;
                        break;
                    case SeekOrigin.End:
                        expectedOffset = RawLength() + offset;
                        break;
                    default:
                        PhpException.Throw(PhpError.Warning, ErrResources.invalid_argument_value, "whence", whence.ToString());
                        return false;
                }

                readOffset = writeOffset = absoluteOffset;

                // No data should be buffered when seeking the underlying stream!
                Debug.Assert(readBuffers == null);
                Debug.Assert(writeBuffer == null || writePosition == 0);
                readPosition = writePosition = 0;

                // EX: This is inaccurate, but there is no better information avalable (w/o processing the whole stream)
                readFilteredCount = readOffset;
                writeFilteredCount = readOffset;

                return absoluteOffset == expectedOffset;
                // Seek is successful if the two values match.
            }
            catch (System.Exception)
            {
                PhpException.Throw(PhpError.Warning, ErrResources.wrapper_op_unsupported, "Seek");
                return false;
            }
        }