CIGAL Reference Manual, Chapter 6 (RealTime): r_fseek
usage: r_fseek opflg eflag ltime Offset Lunit
R_FSEEK is a REALTIME operator. It repositions the data pointer for the open file indicated by LUNIT to the offset specified by the long integer argument OFFSET. LUNIT must refer to a file that has previously been opened by a call to R_FOPEN. If LUNIT is missing it defaults to 1.
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