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| g2_info.c(3) | Library Functions Manual | g2_info.c(3) |
NAME¶
g2_info.c - Search through a GRIB2 message and returns the number of gridded fields found in the message and the number (and maximum size) of Local Use Sections.
SYNOPSIS¶
#include 'grib2_int.h'
#include <stdio.h>
#include <stdlib.h>
Functions¶
g2int g2_info (unsigned char *cgrib, g2int
*listsec0, g2int *listsec1, g2int *numfields, g2int
*numlocal)
Search through a GRIB2 message and return the number of gridded fields found
in the message and the number (and maximum size) of Local Use Sections.
Detailed Description¶
Search through a GRIB2 message and returns the number of gridded fields found in the message and the number (and maximum size) of Local Use Sections.
Author
Date
Definition in file g2_info.c.
Function Documentation¶
g2int g2_info (unsigned char * cgrib, g2int * listsec0, g2int * listsec1, g2int * numfields, g2int * numlocal)¶
Search through a GRIB2 message and return the number of gridded fields found in the message and the number (and maximum size) of Local Use Sections. Other checks are performed to see if the message is a valid GRIB2 message.
Parameters
listsec0 Pointer to an array that gets the information decoded from GRIB Indicator Section 0. Must be allocated with >= 3 elements (see G2C_SECTION0_LEN).
- listsec0(0) Discipline-GRIB Master Table Number ([Code Table 0.0] (https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table0-0.shtml)).
- listsec0[1] GRIB Edition Number (currently 2).
- listsec0[2] Length of GRIB message.
listsec1 Pointer to an array that gets the information read from GRIB Identification Section 1. Must be allocated with >= 13 elements (see G2C_SECTION1_LEN).
- listsec1[0] Id of orginating centre ([Table 0] (https://www.nco.ncep.noaa.gov/pmb/docs/on388/table0.html)).
- listsec1[1] Id of orginating sub-centre ([Table C] (https://www.nco.ncep.noaa.gov/pmb/docs/on388/tablec.html)).
- listsec1[2] GRIB Master Tables Version Number ([Table 1.0] (https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table1-0.shtml)).
- listsec1[3] GRIB Local Tables Version Number ([Table 1.1] (https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table1-1.shtml)).
- listsec1[4] Significance of Reference Time ([Table 1.2] (https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table1-1.shtml))
- listsec1[5] Reference Time - Year (4 digits)
- listsec1[6] Reference Time - Month
- listsec1[7] Reference Time - Day
- listsec1[8] Reference Time - Hour
- listsec1[9] Reference Time - Minute
- listsec1[10] Reference Time - Second
- listsec1[11] Production status of data ([Table 1.3] (https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table1-3.shtml)).
- listsec1[12] Type of processed data ([Table 1.4] (https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table1-4.shtml)).
numfields A pointer that gets the number of gridded fields
found in the GRIB message. That is, the number of occurences of Sections 4 -
7.
numlocal A pointer that gets the number of Local Use Sections (section
2) found in the GRIB message.
Returns
- G2_INFO_NO_GRIB Beginning characters 'GRIB' not found.
- G2_INFO_GRIB_VERSION GRIB message is not Edition 2.
- G2_INFO_NO_SEC1 Could not find Section 1, where expected.
- G2_INFO_WRONG_END End string '7777' found, but not where expected.
- G2_INFO_BAD_END End string '7777' not found at end of message.
- G2_INFO_INVAL_SEC Invalid section number found.
Author
Date
Definition at line 70 of file g2_info.c.
References G2_INFO_BAD_END, G2_INFO_GRIB_VERSION, G2_INFO_INVAL_SEC, G2_INFO_NO_GRIB, G2_INFO_NO_SEC1, G2_INFO_WRONG_END, gbit(), and LOG.
Author¶
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