g2_info.c(3)

✨ NAME ✨

g2_info.c — bestie, this one searches through a GRIB2 message and hands you back the number of gridded fields it found in there, plus the number (and the maximum size) of Local Use Sections. 💖

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🌸 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.

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👑 Detailed Description 👑

Okay so literally what this does: it searches through a GRIB2 message and returns the number of gridded fields found in the message, plus the number (and maximum size) of Local Use Sections. 💅

Author Stephen Gilbeert

Date 2002-10-28

Definition in file g2_info.c.

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🔥 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 too, to see if the message is a valid GRIB2 message. vibe check on your GRIB2, basically. 🫶

🎀 Parameters

• cgrib — Pointer to a buffer containing the GRIB2 message.
• 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] — the docs live at 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

0 for success. Otherwise, bestie, you get one of these:

• 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 Stephen Gilbeert

Date 2002-10-28

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.

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💜 Author 💜

Generated automatically by Doxygen for NCEPLIBS-g2c from the source code.

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and that's the whole page, no cap. 🧚💖

NCEPLIBS-g2c, Version 2.3.0 — okay slay, that's the version and the source right there, and the date on this whole thing is the manpage date up top. mwah. 💅✨🎀