Method Seek

UTCP/src/UTDataSource.cpp:387–401

Seek Moves the file pointer to a specified location Params offset - number of bytes from origin origin - initial position SEEK_CUR SEEK_END SEEK_SET Return offset, in bytes, of the new position from the beginning of the file -1 - error *****************************************/

    -1      - error
*****************************************/
long CUT_FileDataSource::Seek(long offset, int origin)
{
    // When we reading the line of text we use buffering. Thats why
    // actual file position will not match. Fix this problem by subtractng
    // number of bytes read in buffer from current file position
    if(origin == SEEK_CUR && m_nLoadedDataSize > 0) {
        long    lCurPos = m_file.Seek(0, SEEK_CUR) - m_nLoadedDataSize;
        if(lCurPos > 0)
            m_file.Seek(lCurPos, SEEK_SET);
        }

    m_nLoadedDataSize = 0;

    return m_file.Seek(offset, origin);
}

// =================================================================
//  CUT_BufferDataSource class