xdr_compat.cpp
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xdr_compat.cpp
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	#ifdef LAMMPS_XDR

	#include <stdlib.h>
	#include <limits.h>
	#include <string.h>
	#include "xdr_compat.h"

	/* This file is needed for systems, that do not provide XDR support
	* in their system libraries. It was written for windows, but will
	* most probably work on other platforms too. better make sure you
	* test that the xtc files produced are ok before using it.
	*
	* It is also needed on BG/L and Cray XT3/XT4 as we don't have
	* XDR support in the lightweight kernel runtimes either.
	*
	* This file contains the definitions for Sun External Data
	* Representation (XDR) headers and routines.
	*
	* Although the rest of LAMPPS is GPL, you can copy and use the XDR
	* routines in any way you want as long as you obey Sun's license:
	*
	* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
	* unrestricted use provided that this legend is included on all tape
	* media and as a part of the software program in whole or part. Users
	* may copy or modify Sun RPC without charge, but are not authorized
	* to license or distribute it to anyone else except as part of a product or
	* program developed by the user.
	*
	* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
	* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
	*
	* Sun RPC is provided with no support and without any obligation on the
	* part of Sun Microsystems, Inc. to assist in its use, correction,
	* modification or enhancement.
	*
	* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
	* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
	* OR ANY PART THEREOF.
	*
	* In no event will Sun Microsystems, Inc. be liable for any lost revenue
	* or profits or other special, indirect and consequential damages, even if
	* Sun has been advised of the possibility of such damages.
	*
	* Sun Microsystems, Inc.
	* 2550 Garcia Avenue
	* Mountain View, California 94043
	*/

	#ifdef __cplusplus
	extern "C" {
	#endif

	/*
	* for unit alignment
	*/
	static char xdr_zero[BYTES_PER_XDR_UNIT] = {0, 0, 0, 0};

	static xdr_uint32_t xdr_swapbytes(xdr_uint32_t x)
	{
	xdr_uint32_t y;
	int i;
	char px=(char )&x;
	char py=(char )&y;

	for(i=0;i<4;i++)
	py[i]=px[3-i];

	return y;
	}

	static xdr_uint32_t xdr_htonl(xdr_uint32_t x)
	{
	short s=0x0F00;
	if( ((char )&s)==(char)0x0F) {
	/* bigendian, do nothing */
	return x;
	} else {
	/* smallendian,swap bytes */
	return xdr_swapbytes(x);
	}
	}

	static xdr_uint32_t xdr_ntohl(xdr_uint32_t x)
	{
	short s=0x0F00;
	if( ((char )&s)==(char)0x0F) {
	/* bigendian, do nothing */
	return x;
	} else {
	/* smallendian, swap bytes */
	return xdr_swapbytes(x);
	}
	}


	/*
	* Free a data structure using XDR
	* Not a filter, but a convenient utility nonetheless
	*/
	void
	xdr_free (xdrproc_t proc, char *objp)
	{
	XDR x;

	x.x_op = XDR_FREE;
	(*proc) (&x, objp);
	}

	/*
	* XDR nothing
	*/
	bool_t
	xdr_void (void)
	{
	return TRUE;
	}

	/*
	* XDR integers
	*/
	bool_t
	xdr_int (XDR xdrs, int ip)
	{
	xdr_int32_t l;

	switch (xdrs->x_op)
	{
	case XDR_ENCODE:
	l = (xdr_int32_t) (*ip);
	return xdr_putint32 (xdrs, &l);

	case XDR_DECODE:
	if (!xdr_getint32 (xdrs, &l))
	{
	return FALSE;
	}
	*ip = (int) l;

	case XDR_FREE:
	return TRUE;
	}
	return FALSE;
	}


	/*
	* XDR unsigned integers
	*/
	bool_t
	xdr_u_int (XDR xdrs, unsigned int up)
	{
	xdr_uint32_t l;

	switch (xdrs->x_op)
	{
	case XDR_ENCODE:
	l = (xdr_uint32_t) (*up);
	return xdr_putuint32 (xdrs, &l);

	case XDR_DECODE:
	if (!xdr_getuint32 (xdrs, &l))
	{
	return FALSE;
	}
	*up = (unsigned int) l;

	case XDR_FREE:
	return TRUE;
	}
	return FALSE;
	}




	/*
	* XDR short integers
	*/
	bool_t
	xdr_short (XDR xdrs, short sp)
	{
	xdr_int32_t l;

	switch (xdrs->x_op)
	{
	case XDR_ENCODE:
	l = (xdr_int32_t) *sp;
	return xdr_putint32 (xdrs, &l);

	case XDR_DECODE:
	if (!xdr_getint32 (xdrs, &l))
	{
	return FALSE;
	}
	*sp = (short) l;
	return TRUE;

	case XDR_FREE:
	return TRUE;
	}
	return FALSE;
	}


	/*
	* XDR unsigned short integers
	*/
	bool_t
	xdr_u_short (XDR xdrs, unsigned short usp)
	{
	xdr_uint32_t l;

	switch (xdrs->x_op)
	{
	case XDR_ENCODE:
	l = (xdr_uint32_t) *usp;
	return xdr_putuint32 (xdrs, &l);

	case XDR_DECODE:
	if (!xdr_getuint32 (xdrs, &l))
	{
	return FALSE;
	}
	*usp = (unsigned short) l;
	return TRUE;

	case XDR_FREE:
	return TRUE;
	}
	return FALSE;
	}


	/*
	* XDR a char
	*/
	bool_t
	xdr_char (XDR xdrs, char cp)
	{
	int i;

	i = (*cp);
	if (!xdr_int (xdrs, &i))
	{
	return FALSE;
	}
	*cp = i;
	return TRUE;
	}

	/*
	* XDR an unsigned char
	*/
	bool_t
	xdr_u_char (XDR xdrs, unsigned char cp)
	{
	unsigned int u;

	u = (*cp);
	if (!xdr_u_int (xdrs, &u))
	{
	return FALSE;
	}
	*cp = u;
	return TRUE;
	}

	/*
	* XDR booleans
	*/
	bool_t
	xdr_bool (XDR xdrs, int bp)
	{
	#define XDR_FALSE ((xdr_int32_t) 0)
	#define XDR_TRUE ((xdr_int32_t) 1)

	xdr_int32_t lb;

	switch (xdrs->x_op)
	{
	case XDR_ENCODE:
	lb = *bp ? XDR_TRUE : XDR_FALSE;
	return xdr_putint32 (xdrs, &lb);

	case XDR_DECODE:
	if (!xdr_getint32 (xdrs, &lb))
	{
	return FALSE;
	}
	*bp = (lb == XDR_FALSE) ? FALSE : TRUE;
	return TRUE;

	case XDR_FREE:
	return TRUE;
	}
	return FALSE;
	#undef XDR_FALSE
	#undef XDR_TRUE
	}



	/*
	* XDR opaque data
	* Allows the specification of a fixed size sequence of opaque bytes.
	* cp points to the opaque object and cnt gives the byte length.
	*/
	bool_t
	xdr_opaque (XDR xdrs, char cp, unsigned int cnt)
	{
	unsigned int rndup;
	static char crud[BYTES_PER_XDR_UNIT];

	/*
	* if no data we are done
	*/
	if (cnt == 0)
	return TRUE;

	/*
	* round byte count to full xdr units
	*/
	rndup = cnt % BYTES_PER_XDR_UNIT;
	if (rndup > 0)
	rndup = BYTES_PER_XDR_UNIT - rndup;

	switch (xdrs->x_op)
	{
	case XDR_DECODE:
	if (!xdr_getbytes (xdrs, cp, cnt))
	{
	return FALSE;
	}
	if (rndup == 0)
	return TRUE;
	return xdr_getbytes (xdrs, (char *)crud, rndup);

	case XDR_ENCODE:
	if (!xdr_putbytes (xdrs, cp, cnt))
	{
	return FALSE;
	}
	if (rndup == 0)
	return TRUE;
	return xdr_putbytes (xdrs, xdr_zero, rndup);

	case XDR_FREE:
	return TRUE;
	}
	return FALSE;
	}


	/*
	* XDR null terminated ASCII strings
	* xdr_string deals with "C strings" - arrays of bytes that are
	* terminated by a NULL character. The parameter cpp references a
	* pointer to storage; If the pointer is null, then the necessary
	* storage is allocated. The last parameter is the max allowed length
	* of the string as specified by a protocol.
	*/
	bool_t
	xdr_string (XDR xdrs, char *cpp, unsigned int maxsize)
	{
	char sp = cpp; /* sp is the actual string pointer */
	unsigned int size = 0;
	unsigned int nodesize = 0;

	/*
	* first deal with the length since xdr strings are counted-strings
	*/
	switch (xdrs->x_op)
	{
	case XDR_FREE:
	if (sp == NULL)
	{
	return TRUE; /* already free */
	}
	/* fall through... */
	case XDR_ENCODE:
	if (sp == NULL)
	return FALSE;
	size = strlen (sp);
	break;
	case XDR_DECODE:
	break;
	}

	if (!xdr_u_int (xdrs, &size))
	{
	return FALSE;
	}
	if (size > maxsize)
	{
	return FALSE;
	}
	nodesize = size + 1;

	/*
	* now deal with the actual bytes
	*/
	switch (xdrs->x_op)
	{
	case XDR_DECODE:
	if (nodesize == 0)
	{
	return TRUE;
	}
	if (sp == NULL)
	cpp = sp = (char ) malloc (nodesize);
	if (sp == NULL)
	{
	(void) fputs ("xdr_string: out of memory\n", stderr);
	return FALSE;
	}
	sp[size] = 0;
	/* fall into ... */

	case XDR_ENCODE:
	return xdr_opaque (xdrs, sp, size);

	case XDR_FREE:
	free (sp);
	*cpp = NULL;
	return TRUE;
	}
	return FALSE;
	}



	/* Floating-point stuff */

	bool_t
	xdr_float(XDR xdrs, float fp)
	{
	xdr_int32_t tmp;

	switch (xdrs->x_op) {

	case XDR_ENCODE:
	tmp = (xdr_int32_t )fp;
	return (xdr_putint32(xdrs, &tmp));

	break;

	case XDR_DECODE:
	if (xdr_getint32(xdrs, &tmp)) {
	(xdr_int32_t )fp = tmp;
	return (TRUE);
	}

	break;

	case XDR_FREE:
	return (TRUE);
	}
	return (FALSE);
	}


	bool_t
	xdr_double(XDR xdrs, double dp)
	{

	/* Windows and some other systems dont define double-precision
	* word order in the header files, so unfortunately we have
	* to calculate it!
	*/
	static int LSW=-1; /* Least significant fp word */
	int *ip;
	xdr_int32_t tmp[2];

	if(LSW<0) {
	double x=0.987654321; /* Just a number */

	/* Possible representations in IEEE double precision:
	* (S=small endian, B=big endian)
	*
	* Byte order, Word order, Hex
	* S S b8 56 0e 3c dd 9a ef 3f
	* B S 3c 0e 56 b8 3f ef 9a dd
	* S B dd 9a ef 3f b8 56 0e 3c
	* B B 3f ef 9a dd 3c 0e 56 b8
	*/

	unsigned char ix = ((char )&x);

	if(ix==0xdd \|\| ix==0x3f)
	LSW=1; /* Big endian word order */
	else if(ix==0xb8 \|\| ix==0x3c)
	LSW=0; /* Small endian word order */
	else { /* Catch strange errors */
	printf("Error when detecting floating-point word order.\n"
	"Do you have a non-IEEE system?\n"
	"If possible, use the XDR libraries provided with your system,\n"
	"instead of the Gromacs fallback XDR source.\n");
	exit(0);
	}
	}

	switch (xdrs->x_op) {

	case XDR_ENCODE:
	ip = (int *)dp;
	tmp[0] = ip[!LSW];
	tmp[1] = ip[LSW];
	return (xdr_putint32(xdrs, tmp) &&
	xdr_putint32(xdrs, tmp+1));

	break;

	case XDR_DECODE:
	ip = (int *)dp;
	if (xdr_getint32(xdrs, tmp+!LSW) &&
	xdr_getint32(xdrs, tmp+LSW)) {
	ip[0] = tmp[0];
	ip[1] = tmp[1];
	return (TRUE);
	}

	break;

	case XDR_FREE:
	return (TRUE);
	}
	return (FALSE);
	}


	/* Array routines */

	/*
	* xdr_vector():
	*
	* XDR a fixed length array. Unlike variable-length arrays,
	* the storage of fixed length arrays is static and unfreeable.
	* > basep: base of the array
	* > size: size of the array
	* > elemsize: size of each element
	* > xdr_elem: routine to XDR each element
	*/
	bool_t
	xdr_vector (XDR xdrs, char basep, unsigned int nelem,
	unsigned int elemsize, xdrproc_t xdr_elem)
	{
	#define LASTUNSIGNED ((unsigned int)0-1)
	unsigned int i;
	char *elptr;

	elptr = basep;
	for (i = 0; i < nelem; i++)
	{
	if (!(*xdr_elem) (xdrs, elptr, LASTUNSIGNED))
	{
	return FALSE;
	}
	elptr += elemsize;
	}
	return TRUE;
	#undef LASTUNSIGNED
	}



	static bool_t xdrstdio_getbytes (XDR , char , unsigned int);
	static bool_t xdrstdio_putbytes (XDR , char , unsigned int);
	static unsigned int xdrstdio_getpos (XDR *);
	static bool_t xdrstdio_setpos (XDR *, unsigned int);
	static xdr_int32_t xdrstdio_inline (XDR , int);
	static void xdrstdio_destroy (XDR *);
	static bool_t xdrstdio_getint32 (XDR , xdr_int32_t );
	static bool_t xdrstdio_putint32 (XDR , xdr_int32_t );
	static bool_t xdrstdio_getuint32 (XDR , xdr_uint32_t );
	static bool_t xdrstdio_putuint32 (XDR , xdr_uint32_t );

	/*
	* Ops vector for stdio type XDR
	*/
	static const struct xdr_ops xdrstdio_ops =
	{
	xdrstdio_getbytes, /* deserialize counted bytes */
	xdrstdio_putbytes, /* serialize counted bytes */
	xdrstdio_getpos, /* get offset in the stream */
	xdrstdio_setpos, /* set offset in the stream */
	xdrstdio_inline, /* prime stream for inline macros */
	xdrstdio_destroy, /* destroy stream */
	xdrstdio_getint32, /* deserialize a int */
	xdrstdio_putint32, /* serialize a int */
	xdrstdio_getuint32, /* deserialize a int */
	xdrstdio_putuint32 /* serialize a int */
	};

	/*
	* Initialize a stdio xdr stream.
	* Sets the xdr stream handle xdrs for use on the stream file.
	* Operation flag is set to op.
	*/
	void
	xdrstdio_create (XDR xdrs, FILE file, enum xdr_op op)
	{
	xdrs->x_op = op;
	/* We have to add the const since the `struct xdr_ops' in `struct XDR'
	is not `const'. */
	xdrs->x_ops = (struct xdr_ops *) &xdrstdio_ops;
	xdrs->x_private = (char *) file;
	xdrs->x_handy = 0;
	xdrs->x_base = 0;
	}

	/*
	* Destroy a stdio xdr stream.
	* Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
	*/
	static void
	xdrstdio_destroy (XDR *xdrs)
	{
	(void) fflush ((FILE *) xdrs->x_private);
	/* xx should we close the file ?? */
	}


	static bool_t
	xdrstdio_getbytes (XDR xdrs, char addr, unsigned int len)
	{
	if ((len != 0) && (fread (addr, (int) len, 1,
	(FILE *) xdrs->x_private) != 1))
	return FALSE;
	return TRUE;
	}

	static bool_t
	xdrstdio_putbytes (XDR xdrs, char addr, unsigned int len)
	{
	if ((len != 0) && (fwrite (addr, (int) len, 1,
	(FILE *) xdrs->x_private) != 1))
	return FALSE;
	return TRUE;
	}

	static unsigned int
	xdrstdio_getpos (XDR *xdrs)
	{
	return (unsigned int) ftell ((FILE *) xdrs->x_private);
	}

	static bool_t
	xdrstdio_setpos (XDR *xdrs, unsigned int pos)
	{
	return fseek ((FILE *) xdrs->x_private, (xdr_int32_t) pos, 0) < 0 ? FALSE : TRUE;
	}

	static xdr_int32_t *
	xdrstdio_inline (XDR *xdrs, int len)
	{
	/*
	* Must do some work to implement this: must insure
	* enough data in the underlying stdio buffer,
	* that the buffer is aligned so that we can indirect through a
	* long *, and stuff this pointer in xdrs->x_buf. Doing
	* a fread or fwrite to a scratch buffer would defeat
	* most of the gains to be had here and require storage
	* management on this buffer, so we don't do this.
	*/
	return NULL;
	}

	static bool_t
	xdrstdio_getint32 (XDR xdrs, xdr_int32_t ip)
	{
	xdr_int32_t mycopy;

	if (fread ((char ) &mycopy, 4, 1, (FILE ) xdrs->x_private) != 1)
	return FALSE;
	*ip = xdr_ntohl (mycopy);
	return TRUE;
	}

	static bool_t
	xdrstdio_putint32 (XDR xdrs, xdr_int32_t ip)
	{
	xdr_int32_t mycopy = xdr_htonl (*ip);

	ip = &mycopy;
	if (fwrite ((char ) ip, 4, 1, (FILE ) xdrs->x_private) != 1)
	return FALSE;
	return TRUE;
	}

	static bool_t
	xdrstdio_getuint32 (XDR xdrs, xdr_uint32_t ip)
	{
	xdr_uint32_t mycopy;

	if (fread ((char ) &mycopy, 4, 1, (FILE ) xdrs->x_private) != 1)
	return FALSE;
	*ip = xdr_ntohl (mycopy);
	return TRUE;
	}

	static bool_t
	xdrstdio_putuint32 (XDR xdrs, xdr_uint32_t ip)
	{
	xdr_uint32_t mycopy = xdr_htonl (*ip);

	ip = &mycopy;
	if (fwrite ((char ) ip, 4, 1, (FILE ) xdrs->x_private) != 1)
	return FALSE;
	return TRUE;
	}

	#ifdef __cplusplus
	}
	#endif

	#else
	/* satisfy compilers that do not like to compile empty files. */
	static void i_am_a_dummy_subroutine(void) {
	return;
	}
	#endif

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