skgb.f File Reference

Search for next grib message. More...

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Functions/Subroutines
subroutine	skgb (LUGB, ISEEK, MSEEK, LSKIP, LGRIB)
	This subprogram searches a file for the next grib 1 message. More...

Detailed Description

Search for next grib message.

Author

Mark Iredell

Date

1993-11-22

Definition in file skgb.f.

Function/Subroutine Documentation

skgb()

subroutine skgb	(		LUGB,
			ISEEK,
			MSEEK,
			LSKIP,
			LGRIB
	)

This subprogram searches a file for the next grib 1 message.

A grib 1 message is identified by its indicator section, i.e. an 8-byte sequence with 'grib' in bytes 1-4 and 1 in byte 8. 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.

Program history log:

• Mark Iredell 1993-11-22
• Mark Iredell 1995-10-31 Add call to baread.
• Mark Iredell 1997-03-14 Check for '7777'.
• Stephen Gilbert 2001-12-05 Modified to also look for grib2 messages.

Parameters

[in]	LUGB	Integer logical unit of input grib file.
[in]	ISEEK	Integer number of bytes to skip before search.
[in]	MSEEK	Integer maximum number of bytes to search.
[out]	LSKIP	Integer number of bytes to skip before message.
[out]	LGRIB	Integer number of bytes in message (0 if not found).

Author

Mark Iredell

Date

1993-11-22

Definition at line 26 of file skgb.f.