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lammps/src/MISC/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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