2 * xdr_mem.h, XDR implementation using memory buffers.
4 * Copyright (C) 1984, Sun Microsystems, Inc.
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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;
84 * Nothing needs to be done for the memory case. The argument is clearly
89 xdrmem_destroy (XDR *xdrs)
94 * Gets the next word from the memory referenced by xdrs and places it
95 * in the long pointed to by lp. It then increments the private word to
96 * point at the next element. Neither object pointed to is const
99 xdrmem_getlong (XDR *xdrs, long *lp)
101 if (xdrs->x_handy < 4)
104 *lp = (int32_t) ntohl ((*((int32_t *) (xdrs->x_private))));
105 xdrs->x_private += 4;
110 * Puts the long pointed to by lp in the memory referenced by xdrs. It
111 * then increments the private word to point at the next element. The
112 * long pointed at is const
115 xdrmem_putlong (XDR *xdrs, const long *lp)
117 if (xdrs->x_handy < 4)
120 *(int32_t *) xdrs->x_private = htonl (*lp);
121 xdrs->x_private += 4;
126 * Gets an unaligned number of bytes from the xdrs structure and writes them
127 * to the address passed in addr. Be very careful when calling this routine
128 * as it could leave the xdrs pointing to an unaligned structure which is not
129 * a good idea. None of the things pointed to are const.
132 xdrmem_getbytes (XDR *xdrs, caddr_t addr, u_int len)
134 if (xdrs->x_handy < len)
136 xdrs->x_handy -= len;
137 memcpy (addr, xdrs->x_private, len);
138 xdrs->x_private += len;
143 * The complementary function to the above. The same warnings apply about
144 * unaligned data. The source address is const.
147 xdrmem_putbytes (XDR *xdrs, const char *addr, u_int len)
149 if (xdrs->x_handy < len)
151 xdrs->x_handy -= len;
152 memcpy (xdrs->x_private, addr, len);
153 xdrs->x_private += len;
158 * Not sure what this one does. But it clearly doesn't modify the contents
159 * of xdrs. **FIXME** does this not assume u_int == u_long?
162 xdrmem_getpos (const XDR *xdrs)
164 return (u_long) xdrs->x_private - (u_long) xdrs->x_base;
171 xdrmem_setpos (xdrs, pos)
175 caddr_t newaddr = xdrs->x_base + pos;
176 caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
177 size_t handy = lastaddr - newaddr;
179 if (newaddr > lastaddr
180 || newaddr < xdrs->x_base
181 || handy != (u_int) handy)
184 xdrs->x_private = newaddr;
185 xdrs->x_handy = (u_int) handy;
193 xdrmem_inline (XDR *xdrs, u_int len)
197 if (xdrs->x_handy >= len)
199 xdrs->x_handy -= len;
200 buf = (int32_t *) xdrs->x_private;
201 xdrs->x_private += len;
207 * Gets the next word from the memory referenced by xdrs and places it
208 * in the int pointed to by ip. It then increments the private word to
209 * point at the next element. Neither object pointed to is const
212 xdrmem_getint32 (XDR *xdrs, int32_t *ip)
214 if (xdrs->x_handy < 4)
217 *ip = ntohl ((*((int32_t *) (xdrs->x_private))));
218 xdrs->x_private += 4;
223 * Puts the long pointed to by lp in the memory referenced by xdrs. It
224 * then increments the private word to point at the next element. The
225 * long pointed at is const
228 xdrmem_putint32 (XDR *xdrs, const int32_t *ip)
230 if (xdrs->x_handy < 4)
233 *(int32_t *) xdrs->x_private = htonl (*ip);
234 xdrs->x_private += 4;