skgb.F90 File Reference

Search a file for the next GRIB1 or GRIB2 message. More...

Go to the source code of this file.

Functions/Subroutines
subroutine	skgb (lugb, iseek, mseek, lskip, lgrib)
	Search a file for the next GRIB1 or GRIB2 message. More...
subroutine	skgb8 (lugb, iseek8, mseek8, lskip8, lgrib8)
	Search a file for the next GRIB1 or GRIB2 message. More...

Detailed Description

Search a file for the next GRIB1 or GRIB2 message.

Author

Mark Iredell

Date

1995-10-31

Definition in file skgb.F90.

Function/Subroutine Documentation

skgb()

subroutine skgb	(	integer	lugb,
		integer	iseek,
		integer	mseek,
		integer	lskip,
		integer	lgrib
	)

Search a file for the next GRIB1 or GRIB2 message.

A grib message is identified by its indicator section, which is an 8-byte sequence with 'GRIB' in bytes 1-4 and a '1' or '2' in byte

1. If found, the length of the message is decoded from bytes 5-7. The search is done over a given section of the file. The search is terminated if an eof or i/o error is encountered.

Parameters

[in]	lugb	Unit of the unblocked grib file.
[in]	iseek	Number of bytes to skip before search.
[in]	mseek	Maximum number of bytes to search.
[out]	lskip	Number of bytes to skip before message.
[out]	lgrib	Number of bytes in message (0 if not found).

Author

Mark Iredell

Date

1995-10-31

Definition at line 20 of file skgb.F90.

References skgb8().

skgb8()

subroutine skgb8	(	integer	lugb,
		integer*8	iseek8,
		integer*8	mseek8,
		integer*8	lskip8,
		integer*8	lgrib8
	)

Search a file for the next GRIB1 or GRIB2 message.

This function works for GRIB2 files larger than 2 GB, but still requires that each GRIB2 message be less than 2 GB.

A grib message is identified by its indicator section, which is an 8-byte sequence with 'GRIB' in bytes 1-4 and a '1' or '2' in byte

1. If found, the length of the message is decoded from bytes 5-7. The search is done over a given section of the file. The search is terminated if an eof or i/o error is encountered.

Parameters

[in]	lugb	Unit of the unblocked grib file.
[in]	iseek8	Number of bytes to skip before search.
[in]	mseek8	Maximum number of bytes to search.
[out]	lskip8	Number of bytes to skip before message.
[out]	lgrib8	Number of bytes in message (0 if not found).

Author

Edward Hartnett

Date

2023-08-21

Definition at line 52 of file skgb.F90.

References g2_gbytec().

Referenced by getg2i2r(), and skgb().