Macros
#define	NEP_MAGIC_GEOTIFF_STANDARD "II*"

#define	NEP_MAGIC_GEOTIFF_BIGTIFF "II+"

#define	NEP_MAGIC_CDF "\xCD\xF3\x00\x01"

#define	NEP_MAGIC_GRIB2 "GRIB"

#define	NEP_MAGIC_FITS "SIMPLE"

#define	NEP_MAGIC_PDS4 "<?xml"

Detailed Description

Each NEP format handler is identified by a short byte sequence (magic number) at the start of the file. NetCDF-C compares the first bytes of any file opened with nc_open() against each registered magic string to select the correct UDF handler. All magic strings are null-terminated C strings except NEP_MAGIC_CDF, which contains embedded null bytes and must be matched by length.

Macro	Value	Format	Notes
NEP_MAGIC_GEOTIFF_STANDARD	`"II*"`	GeoTIFF standard TIFF	Little-endian TIFF byte-order mark
NEP_MAGIC_GEOTIFF_BIGTIFF	`"II+"`	GeoTIFF BigTIFF	Little-endian BigTIFF marker
NEP_MAGIC_GRIB2	`"GRIB"`	GRIB2	All GRIB editions share this magic
NEP_MAGIC_FITS	`"SIMPLE"`	FITS	First 6 bytes of every FITS file
NEP_MAGIC_CDF	`\xCD\xF3\x00\x01`	NASA CDF	4-byte binary signature
NEP_MAGIC_PDS4	`"<?xml"`	PDS4	XML declaration; namespace checked

Macro Definition Documentation

◆ NEP_MAGIC_CDF

#define NEP_MAGIC_CDF "\xCD\xF3\x00\x01"

NASA CDF magic number: 0xCDF30001

◆ NEP_MAGIC_FITS

#define NEP_MAGIC_FITS "SIMPLE"

FITS magic number: "SIMPLE" (first 6 bytes of a FITS file)

◆ NEP_MAGIC_GEOTIFF_BIGTIFF

#define NEP_MAGIC_GEOTIFF_BIGTIFF "II+"

GeoTIFF BigTIFF magic number: "II+"

◆ NEP_MAGIC_GEOTIFF_STANDARD

#define NEP_MAGIC_GEOTIFF_STANDARD "II*"

GeoTIFF standard TIFF magic number: "II*"

◆ NEP_MAGIC_GRIB2

#define NEP_MAGIC_GRIB2 "GRIB"

GRIB2 magic number: "GRIB"

◆ NEP_MAGIC_PDS4

#define NEP_MAGIC_PDS4 "<?xml"

PDS4 magic number: XML label files begin with "<?xml"

Macros