seekgb.c File Reference

Search a file for the next GRIB message. More...

#include <stdio.h>
#include <stdlib.h>
#include "grib2_int.h"

Go to the source code of this file.

Functions
void	seekgb (FILE *lugb, g2int iseek, g2int mseek, g2int *lskip, g2int *lgrib)
	Search a file for the next GRIB Message. More...

Detailed Description

Search a file for the next GRIB message.

Author

Stephen Gilbert

Date

2002-10-28

Program History Log

Date	Programmer	Comments
2002-10-28	GILBERT	Modified from Iredell's skgb subroutine
2009-01-16	VUONG	Changed lskip to 4 instead of sizof(g2int)
2022-09-11	Hartnett	Added g2c_seekgb() function.

Definition in file seekgb.c.

Function Documentation

seekgb()

void seekgb	(	FILE *	lugb,
		g2int	iseek,
		g2int	mseek,
		g2int *	lskip,
		g2int *	lgrib
	)

Search a file for the next GRIB Message.

The search is done starting at byte offset iseek of the file referenced by lugb for mseek bytes at a time. If found, the starting position and length of the message are returned in lskip and lgrib, respectively. The search is terminated when an EOF or I/O error is encountered.

Program History Log

Date	Programmer	Comments
2002-10-28	GILBERT	Modified from Iredell's skgb subroutine
2009-01-16	VUONG	Changed lskip to 4 instead of sizof(g2int)

Parameters

lugb	FILE pointer for the file to search. File must be opened before this routine is called.
iseek	The number of bytes in the file to skip before search.
mseek	The maximum number of bytes to search at a time (must be at least 16, but larger numbers like 4092 will result in better perfomance).
lskip	Pointer that gets the number of bytes to skip from the beggining of the file to where the GRIB message starts.
lgrib	Pointer that gets the number of bytes in message (set to 0, if no message found).

Author

Stephen Gilbert

Date

2002-10-28

Definition at line 46 of file seekgb.c.

References BYTE, gbit(), and LOG.

Referenced by g2c_get_msg().