sunrpc/xdr_stdio.c

   1 /*
   2  * xdr_stdio.c, XDR implementation on standard i/o file.
   3  *
   4  * Copyright (c) 2010, Oracle America, Inc.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above
  13  *       copyright notice, this list of conditions and the following
  14  *       disclaimer in the documentation and/or other materials
  15  *       provided with the distribution.
  16  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  29  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  * This set of routines implements a XDR on a stdio stream.
  34  * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
  35  * from the stream.
  36  */
  37
  38 #include <rpc/types.h>
  39 #include <stdio.h>
  40 #include <rpc/xdr.h>
  41
  42 #include <libio/iolibio.h>
  43 #define fflush(s) _IO_fflush (s)
  44 #define fread(p, m, n, s) _IO_fread (p, m, n, s)
  45 #define ftell(s) _IO_ftell (s)
  46 #define fwrite(p, m, n, s) _IO_fwrite (p, m, n, s)
  47
  48 static bool_t xdrstdio_getlong (XDR *, long *);
  49 static bool_t xdrstdio_putlong (XDR *, const long *);
  50 static bool_t xdrstdio_getbytes (XDR *, caddr_t, u_int);
  51 static bool_t xdrstdio_putbytes (XDR *, const char *, u_int);
  52 static u_int xdrstdio_getpos (const XDR *);
  53 static bool_t xdrstdio_setpos (XDR *, u_int);
  54 static int32_t *xdrstdio_inline (XDR *, u_int);
  55 static void xdrstdio_destroy (XDR *);
  56 static bool_t xdrstdio_getint32 (XDR *, int32_t *);
  57 static bool_t xdrstdio_putint32 (XDR *, const int32_t *);
  58
  59 /*
  60  * Ops vector for stdio type XDR
  61  */
  62 static const struct xdr_ops xdrstdio_ops =
  63 {
  64   xdrstdio_getlong,             /* deserialize a long int */
  65   xdrstdio_putlong,             /* serialize a long int */
  66   xdrstdio_getbytes,            /* deserialize counted bytes */
  67   xdrstdio_putbytes,            /* serialize counted bytes */
  68   xdrstdio_getpos,              /* get offset in the stream */
  69   xdrstdio_setpos,              /* set offset in the stream */
  70   xdrstdio_inline,              /* prime stream for inline macros */
  71   xdrstdio_destroy,             /* destroy stream */
  72   xdrstdio_getint32,            /* deserialize a int */
  73   xdrstdio_putint32             /* serialize a int */
  74 };
  75
  76 /*
  77  * Initialize a stdio xdr stream.
  78  * Sets the xdr stream handle xdrs for use on the stream file.
  79  * Operation flag is set to op.
  80  */
  81 void
  82 xdrstdio_create (XDR *xdrs, FILE *file, enum xdr_op op)
  83 {
  84   xdrs->x_op = op;
  85   /* We have to add the const since the `struct xdr_ops' in `struct XDR'
  86      is not `const'.  */
  87   xdrs->x_ops = (struct xdr_ops *) &xdrstdio_ops;
  88   xdrs->x_private = (caddr_t) file;
  89   xdrs->x_handy = 0;
  90   xdrs->x_base = 0;
  91 }
  92
  93 /*
  94  * Destroy a stdio xdr stream.
  95  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
  96  */
  97 static void
  98 xdrstdio_destroy (XDR *xdrs)
  99 {
 100   (void) fflush ((FILE *) xdrs->x_private);
 101   /* xx should we close the file ?? */
 102 };
 103
 104 static bool_t
 105 xdrstdio_getlong (XDR *xdrs, long *lp)
 106 {
 107   u_int32_t mycopy;
 108
 109   if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
 110     return FALSE;
 111   *lp = (long) ntohl (mycopy);
 112   return TRUE;
 113 }
 114
 115 static bool_t
 116 xdrstdio_putlong (XDR *xdrs, const long *lp)
 117 {
 118   int32_t mycopy = htonl ((u_int32_t) *lp);
 119
 120   if (fwrite ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
 121     return FALSE;
 122   return TRUE;
 123 }
 124
 125 static bool_t
 126 xdrstdio_getbytes (XDR *xdrs, const caddr_t addr, u_int len)
 127 {
 128   if ((len != 0) && (fread (addr, (int) len, 1,
 129                             (FILE *) xdrs->x_private) != 1))
 130     return FALSE;
 131   return TRUE;
 132 }
 133
 134 static bool_t
 135 xdrstdio_putbytes (XDR *xdrs, const char *addr, u_int len)
 136 {
 137   if ((len != 0) && (fwrite (addr, (int) len, 1,
 138                              (FILE *) xdrs->x_private) != 1))
 139     return FALSE;
 140   return TRUE;
 141 }
 142
 143 static u_int
 144 xdrstdio_getpos (const XDR *xdrs)
 145 {
 146   return (u_int) ftell ((FILE *) xdrs->x_private);
 147 }
 148
 149 static bool_t
 150 xdrstdio_setpos (XDR *xdrs, u_int pos)
 151 {
 152   return fseek ((FILE *) xdrs->x_private, (long) pos, 0) < 0 ? FALSE : TRUE;
 153 }
 154
 155 static int32_t *
 156 xdrstdio_inline (XDR *xdrs, u_int len)
 157 {
 158   /*
 159    * Must do some work to implement this: must insure
 160    * enough data in the underlying stdio buffer,
 161    * that the buffer is aligned so that we can indirect through a
 162    * long *, and stuff this pointer in xdrs->x_buf.  Doing
 163    * a fread or fwrite to a scratch buffer would defeat
 164    * most of the gains to be had here and require storage
 165    * management on this buffer, so we don't do this.
 166    */
 167   return NULL;
 168 }
 169
 170 static bool_t
 171 xdrstdio_getint32 (XDR *xdrs, int32_t *ip)
 172 {
 173   int32_t mycopy;
 174
 175   if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
 176     return FALSE;
 177   *ip = ntohl (mycopy);
 178   return TRUE;
 179 }
 180
 181 static bool_t
 182 xdrstdio_putint32 (XDR *xdrs, const int32_t *ip)
 183 {
 184   int32_t mycopy = htonl (*ip);
 185
 186   ip = &mycopy;
 187   if (fwrite ((caddr_t) ip, 4, 1, (FILE *) xdrs->x_private) != 1)
 188     return FALSE;
 189   return TRUE;
 190 }
 191 #ifdef EXPORT_RPC_SYMBOLS
 192 libc_hidden_def (xdrstdio_create)
 193 #else
 194 libc_hidden_nolink_sunrpc (xdrstdio_create, GLIBC_2_0)
 195 #endif