2 * xdr_mem.c, XDR implementation using memory buffers.
4 * Copyright (c) 2010, Oracle America, Inc.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
10 * * Redistributions of source code must retain the above copyright
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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.
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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
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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.
33 * If you have some data to be interpreted as external data representation
34 * or to be converted to external data representation in a memory buffer,
35 * then this is the package for you.
41 #include <shlib-compat.h>
43 static bool_t xdrmem_getlong (XDR *, long *);
44 static bool_t xdrmem_putlong (XDR *, const long *);
45 static bool_t xdrmem_getbytes (XDR *, caddr_t, u_int);
46 static bool_t xdrmem_putbytes (XDR *, const char *, u_int);
47 static u_int xdrmem_getpos (const XDR *);
48 static bool_t xdrmem_setpos (XDR *, u_int);
49 static int32_t *xdrmem_inline (XDR *, u_int);
50 static void xdrmem_destroy (XDR *);
51 static bool_t xdrmem_getint32 (XDR *, int32_t *);
52 static bool_t xdrmem_putint32 (XDR *, const int32_t *);
54 static const struct xdr_ops xdrmem_ops =
69 * The procedure xdrmem_create initializes a stream descriptor for a
73 xdrmem_create (XDR *xdrs, const caddr_t addr, u_int size, enum xdr_op op)
76 /* We have to add the const since the `struct xdr_ops' in `struct XDR'
78 xdrs->x_ops = (struct xdr_ops *) &xdrmem_ops;
79 xdrs->x_private = xdrs->x_base = addr;
82 #ifdef EXPORT_RPC_SYMBOLS
83 libc_hidden_def (xdrmem_create)
85 libc_hidden_nolink_sunrpc (xdrmem_create, GLIBC_2_0)
89 * Nothing needs to be done for the memory case. The argument is clearly
94 xdrmem_destroy (XDR *xdrs)
99 * Gets the next word from the memory referenced by xdrs and places it
100 * in the long pointed to by lp. It then increments the private word to
101 * point at the next element. Neither object pointed to is const
104 xdrmem_getlong (XDR *xdrs, long *lp)
106 if (xdrs->x_handy < 4)
109 *lp = (int32_t) ntohl ((*((int32_t *) (xdrs->x_private))));
110 xdrs->x_private += 4;
115 * Puts the long pointed to by lp in the memory referenced by xdrs. It
116 * then increments the private word to point at the next element. The
117 * long pointed at is const
120 xdrmem_putlong (XDR *xdrs, const long *lp)
122 if (xdrs->x_handy < 4)
125 *(int32_t *) xdrs->x_private = htonl (*lp);
126 xdrs->x_private += 4;
131 * Gets an unaligned number of bytes from the xdrs structure and writes them
132 * to the address passed in addr. Be very careful when calling this routine
133 * as it could leave the xdrs pointing to an unaligned structure which is not
134 * a good idea. None of the things pointed to are const.
137 xdrmem_getbytes (XDR *xdrs, caddr_t addr, u_int len)
139 if (xdrs->x_handy < len)
141 xdrs->x_handy -= len;
142 memcpy (addr, xdrs->x_private, len);
143 xdrs->x_private += len;
148 * The complementary function to the above. The same warnings apply about
149 * unaligned data. The source address is const.
152 xdrmem_putbytes (XDR *xdrs, const char *addr, u_int len)
154 if (xdrs->x_handy < len)
156 xdrs->x_handy -= len;
157 memcpy (xdrs->x_private, addr, len);
158 xdrs->x_private += len;
163 * Not sure what this one does. But it clearly doesn't modify the contents
164 * of xdrs. **FIXME** does this not assume u_int == u_long?
167 xdrmem_getpos (const XDR *xdrs)
169 return (u_long) xdrs->x_private - (u_long) xdrs->x_base;
176 xdrmem_setpos (XDR *xdrs, u_int pos)
178 caddr_t newaddr = xdrs->x_base + pos;
179 caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
180 size_t handy = lastaddr - newaddr;
182 if (newaddr > lastaddr
183 || newaddr < xdrs->x_base
184 || handy != (u_int) handy)
187 xdrs->x_private = newaddr;
188 xdrs->x_handy = (u_int) handy;
196 xdrmem_inline (XDR *xdrs, u_int len)
200 if (xdrs->x_handy >= len)
202 xdrs->x_handy -= len;
203 buf = (int32_t *) xdrs->x_private;
204 xdrs->x_private += len;
210 * Gets the next word from the memory referenced by xdrs and places it
211 * in the int pointed to by ip. It then increments the private word to
212 * point at the next element. Neither object pointed to is const
215 xdrmem_getint32 (XDR *xdrs, int32_t *ip)
217 if (xdrs->x_handy < 4)
220 *ip = ntohl ((*((int32_t *) (xdrs->x_private))));
221 xdrs->x_private += 4;
226 * Puts the long pointed to by lp in the memory referenced by xdrs. It
227 * then increments the private word to point at the next element. The
228 * long pointed at is const
231 xdrmem_putint32 (XDR *xdrs, const int32_t *ip)
233 if (xdrs->x_handy < 4)
236 *(int32_t *) xdrs->x_private = htonl (*ip);
237 xdrs->x_private += 4;