The R Project SVN R

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdint.h>

/* Local mod: assumes WIN32 is i386 and little-endian generic is 32-bit */
#if defined(WIN32) || defined(__CYGWIN__)
static uint32_t ntohl(uint32_t x)
{ /* could write VC++ inline assembler, but not worth it for now */
#ifdef _MSC_VER
  return((x << 24) | ((x & 0xff00) << 8) | ((x & 0xff0000) >> 8) | (x >> 24));
#else
  __asm__("xchgb %b0,%h0\n\t"   /* swap lower bytes */
      "rorl $16,%0\n\t" /* swap words       */
      "xchgb %b0,%h0"       /* swap higher bytes    */
      :"=q" (x)
      : "0" (x));
  return x;
#endif 
}
#else /* net is big-endian: little-endian hosts need byte-swap code */
#ifndef WORDS_BIGENDIAN
/* #ifdef LITTLE_ENDIAN */
static uint32_t ntohl (uint32_t x)
{
  return((x << 24) | ((x & 0xff00) << 8) | ((x & 0xff0000) >> 8) | (x >> 24));
}
#else
#define ntohl(x) (x)
#endif
#endif
#define htonl ntohl

/*********************************************************************
 * RPC for the Windows NT Operating System
 * 1993 by Martin F. Gergeleit
 * Users may use, copy or modify Sun RPC for the Windows NT Operating 
 * System according to the Sun copyright below.
 *
 * RPC for the Windows NT Operating System COMES WITH ABSOLUTELY NO 
 * WARRANTY, NOR WILL I BE LIABLE FOR ANY DAMAGES INCURRED FROM THE 
 * USE OF. USE ENTIRELY AT YOUR OWN RISK!!!
 *********************************************************************/

/* @(#)xdr_stdio.c  2.1 88/07/29 4.0 RPCSRC */
/*
 * 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
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * xdr_stdio.c, XDR implementation on standard i/o file.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 *
 * This set of routines implements a XDR on a stdio stream.
 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
 * from the stream.
 */

#include <rpc/types.h>
#include <stdio.h>
#include <rpc/xdr.h>

static bool_t   xdrstdio_getlong();
static bool_t   xdrstdio_putlong();
static bool_t   xdrstdio_getbytes();
static bool_t   xdrstdio_putbytes();
static u_int    xdrstdio_getpos();
static bool_t   xdrstdio_setpos();
static long *   xdrstdio_inline();
static void xdrstdio_destroy();

/*
 * Ops vector for stdio type XDR
 */
static struct xdr_ops   xdrstdio_ops = {
    xdrstdio_getlong,   /* deserialize a long int */
    xdrstdio_putlong,   /* serialize a long int */
    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 */
};

/*
 * 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(xdrs, file, op)
    register XDR *xdrs;
    FILE *file;
    enum xdr_op op;
{

    xdrs->x_op = op;
    xdrs->x_ops = &xdrstdio_ops;
    xdrs->x_private = (caddr_t)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(xdrs)
    register XDR *xdrs;
{
    if (xdrs->x_op == XDR_ENCODE) fflush((FILE *)xdrs->x_private);
    /* xx should we close the file ?? */
}

static bool_t
xdrstdio_getlong(XDR *xdrs, int32_t *lp)
{
    if (fread((caddr_t)lp, 4, 1, (FILE *)xdrs->x_private) != 1)
        return (FALSE);
    *lp = ntohl(*lp);
    return (TRUE);
}

static bool_t
xdrstdio_putlong(XDR *xdrs, int32_t *lp)
{
    int32_t mycopy = htonl(*lp);
    lp = &mycopy;
    if (fwrite((caddr_t)lp, 4, 1, (FILE *)xdrs->x_private) != 1)
        return (FALSE);
    return (TRUE);
}

static bool_t
xdrstdio_getbytes(xdrs, addr, len)
    XDR *xdrs;
    caddr_t addr;
    u_int len;
{

    if ((len != 0) && (fread(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
        return (FALSE);
    return (TRUE);
}

static bool_t
xdrstdio_putbytes(xdrs, addr, len)
    XDR *xdrs;
    caddr_t addr;
    u_int len;
{

    if ((len != 0) && (fwrite(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
        return (FALSE);
    return (TRUE);
}

static u_int
xdrstdio_getpos(xdrs)
    XDR *xdrs;
{

    return ((u_int) ftell((FILE *)xdrs->x_private));
}

static bool_t
xdrstdio_setpos(xdrs, pos) 
    XDR *xdrs;
    u_int pos;
{ 

    return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
        FALSE : TRUE);
}

static long *
xdrstdio_inline(xdrs, len)
    XDR *xdrs;
    u_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);
}