gbits.c File Reference

Functions to pack and unpack bits to/from a packed bit string. More...

#include "grib2.h"

Go to the source code of this file.

Functions
void	gbit (unsigned char *in, g2int *iout, g2int iskip, g2int nbyte)
	Get bits - unpack bits: Extract arbitrary size values from a packed bit string, right justifying each value in the unpacked iout array. More...
void	gbits (unsigned char *in, g2int *iout, g2int iskip, g2int nbyte, g2int nskip, g2int n)
	Get bits - unpack bits: Extract arbitrary size values from a packed bit string, right justifying each value in the unpacked iout array. More...
void	sbit (unsigned char *out, g2int *in, g2int iskip, g2int nbyte)
	Store bits - put arbitrary size values into a packed bit string, taking the low order bits from each value in the unpacked array. More...
void	sbits (unsigned char *out, g2int *in, g2int iskip, g2int nbyte, g2int nskip, g2int n)
	Store bits - put arbitrary size values into a packed bit string, taking the low order bits from each value in the unpacked array. More...

Detailed Description

Functions to pack and unpack bits to/from a packed bit string.

Author

NOAA Programmer

Definition in file gbits.c.

Function Documentation

gbit()

void gbit	(	unsigned char *	in,
		g2int *	iout,
		g2int	iskip,
		g2int	nbyte
	)

Get bits - unpack bits: Extract arbitrary size values from a packed bit string, right justifying each value in the unpacked iout array.

Parameters

in	pointer to character array input.
iout	pointer to unpacked array output.
iskip	initial number of bits to skip.
nbyte	number of bits to take.

Author

NOAA Programmer

Definition at line 20 of file gbits.c.

References gbits().

Referenced by comunpack(), g2_addfield(), g2_addgrid(), g2_addlocal(), g2_getfld(), g2_gribend(), g2_info(), g2_unpack1(), g2_unpack2(), g2_unpack3(), g2_unpack4(), g2_unpack5(), g2_unpack6(), g2_unpack7(), and seekgb().

gbits()

void gbits	(	unsigned char *	in,
		g2int *	iout,
		g2int	iskip,
		g2int	nbyte,
		g2int	nskip,
		g2int	n
	)

Get bits - unpack bits: Extract arbitrary size values from a packed bit string, right justifying each value in the unpacked iout array.

Parameters

in	Pointer to character array input.
iout	Pointer to unpacked array output.
iskip	Initial number of bits to skip.
nbyte	Number of bits to take.
nskip	Additional number of bits to skip on each iteration.
n	Number of iterations.

Author

NOAA Programmer

Definition at line 57 of file gbits.c.

Referenced by comunpack(), g2_unpack3(), g2_unpack4(), g2_unpack6(), gbit(), pngunpack(), simunpack(), and specunpack().

sbit()

void sbit	(	unsigned char *	out,
		g2int *	in,
		g2int	iskip,
		g2int	nbyte
	)

Store bits - put arbitrary size values into a packed bit string, taking the low order bits from each value in the unpacked array.

Parameters

out	Pointer to packed array output. Must be allocated large enough to hold output.
in	Pointer to unpacked array input.
iskip	Initial number of bits to skip.
nbyte	Number of bits to pack.

Author

NOAA Programmer

Definition at line 38 of file gbits.c.

References sbits().

Referenced by compack(), g2_addfield(), g2_addgrid(), g2_addlocal(), g2_create(), g2_gribend(), misspack(), and simpack().

sbits()

void sbits	(	unsigned char *	out,
		g2int *	in,
		g2int	iskip,
		g2int	nbyte,
		g2int	nskip,
		g2int	n
	)

Store bits - put arbitrary size values into a packed bit string, taking the low order bits from each value in the unpacked array.

Parameters

out	Pointer to packed array output. Must be allocated large enough to hold output.
in	Pointer to unpacked array input.
iskip	Initial number of bits to skip.
nbyte	Number of bits to pack.
nskip	Additional number of bits to skip on each iteration.
n	Number of iterations.

Author

NOAA Programmer

Definition at line 114 of file gbits.c.

Referenced by compack(), g2_addfield(), g2_addgrid(), jpcpack(), misspack(), pngpack(), sbit(), and simpack().