g2_unpack1.c(3)

💖 g2_unpack1.c 💖

okay bestie, pull up a chair because today we're reading the Library Functions Manual entry for g2_unpack1.c, and honestly? it's giving GRIB2 identification section unpacking and I am obsessed. 🦋

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✨ NAME ✨

g2_unpack1.c — Unpack Section 1 (Identification Section) of a GRIB2 message.

like. that's the whole job. one section. one vibe. she unpacks it. periodt. 💅

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🌸 SYNOPSIS 🌸

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

🎀 Functions 🎀

• g2int g2_unpack1 (unsigned char *cgrib, g2int *iofst, g2int **ids, g2int *idslen) — Unpacks Section 1 - Identification Section of a GRIB2 message.

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🫶 Detailed Description 🫶

Unpack Section 1 (Identification Section) of a GRIB2 message.

Author Stephen Gilbert

Date 2002-10-29

Definition in file g2_unpack1.c.

not me realizing this function has been out here doing its little unpack since 2002 and still ate. 👑

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👑 Function Documentation 👑

⭐ g2int g2_unpack1 (unsigned char * cgrib, g2int * iofst, g2int ** ids, g2int * idslen)

Unpacks Section 1 - Identification Section of a GRIB2 message.

🧚 Parameters 🧚

• cgrib — char array containing Section 1 of the GRIB2 message.
• iofst — Bit offset for the beginning of Section 1 in cgrib.
• ids — Pointer that gets an array which contians the information read from Section 1, the Identification section. This array is allocated by this function, and must be freed by caller (using g2_free()).

💀 bestie listen. THIS ARRAY IS ALLOCATED BY THIS FUNCTION AND YOU GOTTA FREE IT YOURSELF WITH g2_free(). it is not going to clean up after you. no cap.

and here's what's living inside that array, slot by slot, main-character lineup:

• ids[0] Identification of originating Centre (see Table 0).
• ids[1] Identification of originating Sub-centre (see Table C).
• ids[2] GRIB Master Tables Version Number (see Table 1.0).
• ids[3] GRIB Local Tables Version Number (see Table 1.1).
• ids[4] Significance of Reference Time (see Table 1.2).
• ids[5] Year (4 digits)
• ids[6] Month
• ids[7] Day
• ids[8] Hour
• ids[9] Minute
• ids[10] Second
• ids[11] Production status of processed data (see Table 1.3).
• ids[12] Type of processed data (see Table 1.4).

• idslen — Number of elements in ids.

like, 13 little slots of pure identification lore. the way that ids[5] is Year with 4 digits and ids[6] through ids[10] are just quietly counting down the whole entire calendar. iconic. 🗓️✨

🌈 Returns 🌈

• G2_NO_ERROR — No error.
• G2_UNPACK_BAD_SEC — Array passed is not section 1.
• G2_UNPACK_NO_MEM — memory allocation error.

🚨 vibe check: if you handed her something that is not section 1, she is gonna hit you with G2_UNPACK_BAD_SEC. and if the memory allocation flops, it's G2_UNPACK_NO_MEM. she's honest about it fr fr.

Author Stephen Gilbert

Date 2002-10-29

Definition at line 55 of file g2_unpack1.c.

References G2_NO_ERROR, G2_UNPACK_BAD_SEC, G2_UNPACK_NO_MEM, and gbit().

Referenced by g2_getfld().

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💜 Author 💜

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

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okay and that's the whole page, bestie!! 🎀 this lil manual page comes to you courtesy of NCEPLIBS-g2c, Version 2.3.0 (and yeah, it's the g2_unpack1.c(3) page — she's a section-1 unpacker and she knows it 💅). go forth, unpack your identification section, and please remember to g2_free() that array. mwah. 🫶🌸✨