2 * xdr_mem.c, XDR implementation using memory buffers.
4 * Copyright (c) 2010, Oracle America, Inc.
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21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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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.
42 static bool_t xdrmem_getlong (XDR *, long *);
43 static bool_t xdrmem_putlong (XDR *, const long *);
44 static bool_t xdrmem_getbytes (XDR *, caddr_t, u_int);
45 static bool_t xdrmem_putbytes (XDR *, const char *, u_int);
46 static u_int xdrmem_getpos (const XDR *);
47 static bool_t xdrmem_setpos (XDR *, u_int);
48 static int32_t *xdrmem_inline (XDR *, u_int);
49 static void xdrmem_destroy (XDR *);
50 static bool_t xdrmem_getint32 (XDR *, int32_t *);
51 static bool_t xdrmem_putint32 (XDR *, const int32_t *);
53 static const struct xdr_ops xdrmem_ops =
68 * The procedure xdrmem_create initializes a stream descriptor for a
72 xdrmem_create (XDR *xdrs, const caddr_t addr, u_int size, enum xdr_op op)
75 /* We have to add the const since the `struct xdr_ops' in `struct XDR'
77 xdrs->x_ops = (struct xdr_ops *) &xdrmem_ops;
78 xdrs->x_private = xdrs->x_base = addr;
81 #ifdef EXPORT_RPC_SYMBOLS
82 libc_hidden_def (xdrmem_create)
84 libc_hidden_nolink_sunrpc (xdrmem_create, GLIBC_2_0)
88 * Nothing needs to be done for the memory case. The argument is clearly
93 xdrmem_destroy (XDR *xdrs)
98 * Gets the next word from the memory referenced by xdrs and places it
99 * in the long pointed to by lp. It then increments the private word to
100 * point at the next element. Neither object pointed to is const
103 xdrmem_getlong (XDR *xdrs, long *lp)
105 if (xdrs->x_handy < 4)
108 *lp = (int32_t) ntohl ((*((int32_t *) (xdrs->x_private))));
109 xdrs->x_private += 4;
114 * Puts the long pointed to by lp in the memory referenced by xdrs. It
115 * then increments the private word to point at the next element. The
116 * long pointed at is const
119 xdrmem_putlong (XDR *xdrs, const long *lp)
121 if (xdrs->x_handy < 4)
124 *(int32_t *) xdrs->x_private = htonl (*lp);
125 xdrs->x_private += 4;
130 * Gets an unaligned number of bytes from the xdrs structure and writes them
131 * to the address passed in addr. Be very careful when calling this routine
132 * as it could leave the xdrs pointing to an unaligned structure which is not
133 * a good idea. None of the things pointed to are const.
136 xdrmem_getbytes (XDR *xdrs, caddr_t addr, u_int len)
138 if (xdrs->x_handy < len)
140 xdrs->x_handy -= len;
141 memcpy (addr, xdrs->x_private, len);
142 xdrs->x_private += len;
147 * The complementary function to the above. The same warnings apply about
148 * unaligned data. The source address is const.
151 xdrmem_putbytes (XDR *xdrs, const char *addr, u_int len)
153 if (xdrs->x_handy < len)
155 xdrs->x_handy -= len;
156 memcpy (xdrs->x_private, addr, len);
157 xdrs->x_private += len;
162 * Not sure what this one does. But it clearly doesn't modify the contents
163 * of xdrs. **FIXME** does this not assume u_int == u_long?
166 xdrmem_getpos (const XDR *xdrs)
168 return (u_long) xdrs->x_private - (u_long) xdrs->x_base;
175 xdrmem_setpos (xdrs, pos)
179 caddr_t newaddr = xdrs->x_base + pos;
180 caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
181 size_t handy = lastaddr - newaddr;
183 if (newaddr > lastaddr
184 || newaddr < xdrs->x_base
185 || handy != (u_int) handy)
188 xdrs->x_private = newaddr;
189 xdrs->x_handy = (u_int) handy;
197 xdrmem_inline (XDR *xdrs, u_int len)
201 if (xdrs->x_handy >= len)
203 xdrs->x_handy -= len;
204 buf = (int32_t *) xdrs->x_private;
205 xdrs->x_private += len;
211 * Gets the next word from the memory referenced by xdrs and places it
212 * in the int pointed to by ip. It then increments the private word to
213 * point at the next element. Neither object pointed to is const
216 xdrmem_getint32 (XDR *xdrs, int32_t *ip)
218 if (xdrs->x_handy < 4)
221 *ip = ntohl ((*((int32_t *) (xdrs->x_private))));
222 xdrs->x_private += 4;
227 * Puts the long pointed to by lp in the memory referenced by xdrs. It
228 * then increments the private word to point at the next element. The
229 * long pointed at is const
232 xdrmem_putint32 (XDR *xdrs, const int32_t *ip)
234 if (xdrs->x_handy < 4)
237 *(int32_t *) xdrs->x_private = htonl (*ip);
238 xdrs->x_private += 4;