xdr_stdio.c

   1 /*
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   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
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   7  * program developed by the user.
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   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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  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
  53 static bool_t xdrstdio_getlong (XDR *, long *);
  54 static bool_t xdrstdio_putlong (XDR *, const long *);
  55 static bool_t xdrstdio_getbytes (XDR *, caddr_t, u_int);
  56 static bool_t xdrstdio_putbytes (XDR *, const char *, u_int);
  57 static u_int xdrstdio_getpos (const XDR *);
  58 static bool_t xdrstdio_setpos (XDR *, u_int);
  59 static int32_t *xdrstdio_inline (XDR *, u_int);
  60 static void xdrstdio_destroy (XDR *);
  61 static bool_t xdrstdio_getint32 (XDR *, int32_t *);
  62 static bool_t xdrstdio_putint32 (XDR *, const int32_t *);
  63
  64 /*
  65  * Ops vector for stdio type XDR
  66  */
  67 static const struct xdr_ops xdrstdio_ops =
  68 {
  69   xdrstdio_getlong,             /* deserialize a long int */
  70   xdrstdio_putlong,             /* serialize a long int */
  71   xdrstdio_getbytes,            /* deserialize counted bytes */
  72   xdrstdio_putbytes,            /* serialize counted bytes */
  73   xdrstdio_getpos,              /* get offset in the stream */
  74   xdrstdio_setpos,              /* set offset in the stream */
  75   xdrstdio_inline,              /* prime stream for inline macros */
  76   xdrstdio_destroy,             /* destroy stream */
  77   xdrstdio_getint32,            /* deserialize a int */
  78   xdrstdio_putint32             /* serialize a int */
  79 };
  80
  81 /*
  82  * Initialize a stdio xdr stream.
  83  * Sets the xdr stream handle xdrs for use on the stream file.
  84  * Operation flag is set to op.
  85  */
  86 void
  87 xdrstdio_create (XDR *xdrs, FILE *file, enum xdr_op op)
  88 {
  89   xdrs->x_op = op;
  90   /* We have to add the const since the `struct xdr_ops' in `struct XDR'
  91      is not `const'.  */
  92   xdrs->x_ops = (struct xdr_ops *) &xdrstdio_ops;
  93   xdrs->x_private = (caddr_t) file;
  94   xdrs->x_handy = 0;
  95   xdrs->x_base = 0;
  96 }
  97
  98 /*
  99  * Destroy a stdio xdr stream.
 100  * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
 101  */
 102 static void
 103 xdrstdio_destroy (XDR *xdrs)
 104 {
 105   (void) fflush ((FILE *) xdrs->x_private);
 106   /* xx should we close the file ?? */
 107 };
 108
 109 static bool_t
 110 xdrstdio_getlong (XDR *xdrs, long *lp)
 111 {
 112   u_int32_t mycopy;
 113
 114   if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
 115     return FALSE;
 116   *lp = (long) ntohl (mycopy);
 117   return TRUE;
 118 }
 119
 120 static bool_t
 121 xdrstdio_putlong (XDR *xdrs, const long *lp)
 122 {
 123   int32_t mycopy = htonl ((u_int32_t) *lp);
 124
 125   if (fwrite ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
 126     return FALSE;
 127   return TRUE;
 128 }
 129
 130 static bool_t
 131 xdrstdio_getbytes (XDR *xdrs, const caddr_t addr, u_int len)
 132 {
 133   if ((len != 0) && (fread (addr, (int) len, 1,
 134                             (FILE *) xdrs->x_private) != 1))
 135     return FALSE;
 136   return TRUE;
 137 }
 138
 139 static bool_t
 140 xdrstdio_putbytes (XDR *xdrs, const char *addr, u_int len)
 141 {
 142   if ((len != 0) && (fwrite (addr, (int) len, 1,
 143                              (FILE *) xdrs->x_private) != 1))
 144     return FALSE;
 145   return TRUE;
 146 }
 147
 148 static u_int
 149 xdrstdio_getpos (const XDR *xdrs)
 150 {
 151   return (u_int) ftell ((FILE *) xdrs->x_private);
 152 }
 153
 154 static bool_t
 155 xdrstdio_setpos (XDR *xdrs, u_int pos)
 156 {
 157   return fseek ((FILE *) xdrs->x_private, (long) pos, 0) < 0 ? FALSE : TRUE;
 158 }
 159
 160 static int32_t *
 161 xdrstdio_inline (XDR *xdrs attribute_unused, u_int len attribute_unused)
 162 {
 163   /*
 164    * Must do some work to implement this: must insure
 165    * enough data in the underlying stdio buffer,
 166    * that the buffer is aligned so that we can indirect through a
 167    * long *, and stuff this pointer in xdrs->x_buf.  Doing
 168    * a fread or fwrite to a scratch buffer would defeat
 169    * most of the gains to be had here and require storage
 170    * management on this buffer, so we don't do this.
 171    */
 172   return NULL;
 173 }
 174
 175 static bool_t
 176 xdrstdio_getint32 (XDR *xdrs, int32_t *ip)
 177 {
 178   int32_t mycopy;
 179
 180   if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
 181     return FALSE;
 182   *ip = ntohl (mycopy);
 183   return TRUE;
 184 }
 185
 186 static bool_t
 187 xdrstdio_putint32 (XDR *xdrs, const int32_t *ip)
 188 {
 189   int32_t mycopy = htonl (*ip);
 190
 191   ip = &mycopy;
 192   if (fwrite ((caddr_t) ip, 4, 1, (FILE *) xdrs->x_private) != 1)
 193     return FALSE;
 194   return TRUE;
 195 }