eviofmtswap.c File Reference

#include <stdio.h>
#include "evio.h"

Macros
#define	MIN(a, b)   ( (a) < (b) ? (a) : (b) )
#define	SWAP64(x)
#define	SWAP32(x)
#define	SWAP16(x)

Functions
int	eviofmtswap (int32_t *iarr, int nwrd, const unsigned short *ifmt, int nfmt, int tolocal, int padding)
	This function converts (swaps) an array of EVIO composite type data between IEEE (big endian) and DECS (little endian) in place. More...

Macro Definition Documentation

MIN

#define MIN	(		a,
			b
	)		( (a) < (b) ? (a) : (b) )

SWAP16

#define SWAP16

(

x

)

Value:

                    ( (((x) & 0x00ff) << 8) | \
                    (((x) & 0xff00) >> 8) )

SWAP32

#define SWAP32

(

x

)

Value:

                    ( (((x) & 0x000000ff) << 24) | \
                    (((x) & 0x0000ff00) <<  8) | \
                    (((x) & 0x00ff0000) >>  8) | \
                    (((x) & 0xff000000) >> 24) )

SWAP64

#define SWAP64

(

x

)

Value:

                    ( (((x) & 0x00000000000000ff) << 56) | \
                    (((x) & 0x000000000000ff00) << 40) | \
                    (((x) & 0x0000000000ff0000) << 24) | \
                    (((x) & 0x00000000ff000000) <<  8) | \
                    (((x) & 0x000000ff00000000) >>  8) | \
                    (((x) & 0x0000ff0000000000) >> 24) | \
                    (((x) & 0x00ff000000000000) >> 40) | \
                    (((x) & 0xff00000000000000) >> 56) )

Function Documentation

eviofmtswap()

int eviofmtswap	(	int32_t *	iarr,
		int	nwrd,
		const unsigned short *	ifmt,
		int	nfmt,
		int	tolocal,
		int	padding
	)

This function converts (swaps) an array of EVIO composite type data between IEEE (big endian) and DECS (little endian) in place.

This data does NOT include the composite type's beginning tagsegment and the format string it contains. It also does NOT include the data's bank header words.

Converts the data of array (iarr[i], i=0...nwrd-1) using the format code (ifmt[j], j=0...nfmt-1) .

Algorithm description:

Data processed inside while (ib < nwrd) loop, where 'ib' is iarr[] index; loop breaks when 'ib' reaches the number of elements in iarr[]

Parameters

iarr	pointer to data to be swapped
nwrd	number of data words (32-bit ints) to be swapped
ifmt	unsigned short array holding translated format
nfmt	length of unsigned short array, ifmt, in # of shorts
tolocal	if 0 data is of same endian as local host, else data is of opposite endian
padding	number of bytes to ignore in last data word (starting from data end)

Returns

0 if success

-1 if nwrd or nfmt arg(s) < 0