sunrpc/xdr_stdio.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  */
  29
  30 /*
  31  * xdr_stdio.c, XDR implementation on standard i/o file.
  32  *
  33  * Copyright (C) 1984, Sun Microsystems, Inc.
  34  *
  35  * This set of routines implements a XDR on a stdio stream.
  36  * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
  37  * from the stream.
  38  */
  39
  40 #include <rpc/types.h>
  41 #include <stdio.h>
  42 #include <rpc/xdr.h>
  43
  44 #ifdef USE_IN_LIBIO
  45 # include <libio/iolibio.h>
  46 # define fflush(s) _IO_fflush (s)
  47 # define fread(p, m, n, s) _IO_fread (p, m, n, s)
  48 # define ftell(s) _IO_ftell (s)
  49 # define fwrite(p, m, n, s) _IO_fwrite (p, m, n, s)
  50 #endif
  51
  52 static bool_t xdrstdio_getlong (XDR *, long *);
  53 static bool_t xdrstdio_putlong (XDR *, const long *);
  54 static bool_t xdrstdio_getbytes (XDR *, caddr_t, u_int);
  55 static bool_t xdrstdio_putbytes (XDR *, const char *, u_int);
  56 static u_int xdrstdio_getpos (const XDR *);
  57 static bool_t xdrstdio_setpos (XDR *, u_int);
  58 static int32_t *xdrstdio_inline (XDR *, int);
  59 static void xdrstdio_destroy (XDR *);
  60 static bool_t xdrstdio_getint32 (XDR *, int32_t *);
  61 static bool_t xdrstdio_putint32 (XDR *, const int32_t *);
  62
  63 /*
  64  * Ops vector for stdio type XDR
  65  */
  66 static const struct xdr_ops xdrstdio_ops =
  67 {
  68   xdrstdio_getlong,             /* deserialize a long int */
  69   xdrstdio_putlong,             /* serialize a long int */
  70   xdrstdio_getbytes,            /* deserialize counted bytes */
  71   xdrstdio_putbytes,            /* serialize counted bytes */
  72   xdrstdio_getpos,              /* get offset in the stream */
  73   xdrstdio_setpos,              /* set offset in the stream */
  74   xdrstdio_inline,              /* prime stream for inline macros */
  75   xdrstdio_destroy,             /* destroy stream */
  76   xdrstdio_getint32,            /* deserialize a int */
  77   xdrstdio_putint32             /* serialize a int */
  78 };
  79
  80 /*
  81  * Initialize a stdio xdr stream.
  82  * Sets the xdr stream handle xdrs for use on the stream file.
  83  * Operation flag is set to op.
  84  */
  85 void
  86 xdrstdio_create (XDR *xdrs, FILE *file, enum xdr_op op)
  87 {
  88   xdrs->x_op = op;
  89   /* We have to add the const since the `struct xdr_ops' in `struct XDR'
  90      is not `const'.  */
  91   xdrs->x_ops = (struct xdr_ops *) &xdrstdio_ops;
  92   xdrs->x_private = (caddr_t) file;
  93   xdrs->x_handy = 0;
  94   xdrs->x_base = 0;
  95 }
  96
  97 /*
  98  * Destroy a stdio xdr stream.
  99  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
 100  */
 101 static void
 102 xdrstdio_destroy (XDR *xdrs)
 103 {
 104   (void) fflush ((FILE *) xdrs->x_private);
 105   /* xx should we close the file ?? */
 106 };
 107
 108 static bool_t
 109 xdrstdio_getlong (XDR *xdrs, long *lp)
 110 {
 111   int32_t mycopy;
 112
 113   if (fread ((caddr_t) & mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
 114     return FALSE;
 115   *lp = (int32_t) ntohl (mycopy);
 116   return TRUE;
 117 }
 118
 119 static bool_t
 120 xdrstdio_putlong (XDR *xdrs, const long *lp)
 121 {
 122   long mycopy = htonl (*lp);
 123   lp = &mycopy;
 124   if (fwrite ((caddr_t) lp, 4, 1, (FILE *) xdrs->x_private) != 1)
 125     return FALSE;
 126   return TRUE;
 127 }
 128
 129 static bool_t
 130 xdrstdio_getbytes (XDR *xdrs, const caddr_t addr, u_int len)
 131 {
 132   if ((len != 0) && (fread (addr, (int) len, 1,
 133                             (FILE *) xdrs->x_private) != 1))
 134     return FALSE;
 135   return TRUE;
 136 }
 137
 138 static bool_t
 139 xdrstdio_putbytes (XDR *xdrs, const char *addr, u_int len)
 140 {
 141   if ((len != 0) && (fwrite (addr, (int) len, 1,
 142                              (FILE *) xdrs->x_private) != 1))
 143     return FALSE;
 144   return TRUE;
 145 }
 146
 147 static u_int
 148 xdrstdio_getpos (const XDR *xdrs)
 149 {
 150   return (u_int) ftell ((FILE *) xdrs->x_private);
 151 }
 152
 153 static bool_t
 154 xdrstdio_setpos (XDR *xdrs, u_int pos)
 155 {
 156   return fseek ((FILE *) xdrs->x_private, (long) pos, 0) < 0 ? FALSE : TRUE;
 157 }
 158
 159 static int32_t *
 160 xdrstdio_inline (XDR *xdrs, int len)
 161 {
 162   /*
 163    * Must do some work to implement this: must insure
 164    * enough data in the underlying stdio buffer,
 165    * that the buffer is aligned so that we can indirect through a
 166    * long *, and stuff this pointer in xdrs->x_buf.  Doing
 167    * a fread or fwrite to a scratch buffer would defeat
 168    * most of the gains to be had here and require storage
 169    * management on this buffer, so we don't do this.
 170    */
 171   return NULL;
 172 }
 173
 174 static bool_t
 175 xdrstdio_getint32 (XDR *xdrs, int32_t *ip)
 176 {
 177   int32_t mycopy;
 178
 179   if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
 180     return FALSE;
 181   *ip = ntohl (mycopy);
 182   return TRUE;
 183 }
 184
 185 static bool_t
 186 xdrstdio_putint32 (XDR *xdrs, const int32_t *ip)
 187 {
 188   int32_t mycopy = htonl (*ip);
 189
 190   ip = &mycopy;
 191   if (fwrite ((caddr_t) ip, 4, 1, (FILE *) xdrs->x_private) != 1)
 192     return FALSE;
 193   return TRUE;
 194 }