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27 * Mountain View, California 94043
31 * xdr_mem.h, XDR implementation using memory buffers.
33 * Copyright (C) 1984, Sun Microsystems, Inc.
35 * If you have some data to be interpreted as external data representation
36 * or to be converted to external data representation in a memory buffer,
37 * then this is the package for you.
44 static bool_t xdrmem_getlong (XDR *, long *);
45 static bool_t xdrmem_putlong (XDR *, const long *);
46 static bool_t xdrmem_getbytes (XDR *, caddr_t, u_int);
47 static bool_t xdrmem_putbytes (XDR *, const char *, u_int);
48 static u_int xdrmem_getpos (const XDR *);
49 static bool_t xdrmem_setpos (XDR *, u_int);
50 static int32_t *xdrmem_inline (XDR *, int);
51 static void xdrmem_destroy (XDR *);
52 static bool_t xdrmem_getint32 (XDR *, int32_t *);
53 static bool_t xdrmem_putint32 (XDR *, const int32_t *);
55 static const struct xdr_ops xdrmem_ops =
70 * The procedure xdrmem_create initializes a stream descriptor for a
74 xdrmem_create (XDR *xdrs, const caddr_t addr, u_int size, enum xdr_op op)
77 /* We have to add the const since the `struct xdr_ops' in `struct XDR'
79 xdrs->x_ops = (struct xdr_ops *) &xdrmem_ops;
80 xdrs->x_private = xdrs->x_base = addr;
85 * Nothing needs to be done for the memory case. The argument is clearly
90 xdrmem_destroy (XDR *xdrs)
95 * Gets the next word from the memory referenced by xdrs and places it
96 * in the long pointed to by lp. It then increments the private word to
97 * point at the next element. Neither object pointed to is const
100 xdrmem_getlong (XDR *xdrs, long *lp)
102 if ((xdrs->x_handy -= 4) < 0)
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) < 0)
119 *(int32_t *) xdrs->x_private = htonl (*lp);
120 xdrs->x_private += 4;
125 * Gets an unaligned number of bytes from the xdrs structure and writes them
126 * to the address passed in addr. Be very careful when calling this routine
127 * as it could leave the xdrs pointing to an unaligned structure which is not
128 * a good idea. None of the things pointed to are const.
131 xdrmem_getbytes (XDR *xdrs, caddr_t addr, u_int len)
133 if ((xdrs->x_handy -= len) < 0)
135 memcpy (addr, xdrs->x_private, len);
136 xdrs->x_private += len;
141 * The complementary function to the above. The same warnings apply about
142 * unaligned data. The source address is const.
145 xdrmem_putbytes (XDR *xdrs, const char *addr, u_int len)
147 if ((xdrs->x_handy -= len) < 0)
149 memcpy (xdrs->x_private, addr, len);
150 xdrs->x_private += len;
155 * Not sure what this one does. But it clearly doesn't modify the contents
156 * of xdrs. **FIXME** does this not assume u_int == u_long?
159 xdrmem_getpos (const XDR *xdrs)
161 return (u_long) xdrs->x_private - (u_long) xdrs->x_base;
168 xdrmem_setpos (xdrs, pos)
172 caddr_t newaddr = xdrs->x_base + pos;
173 caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
175 if ((long) newaddr > (long) lastaddr)
177 xdrs->x_private = newaddr;
178 xdrs->x_handy = (long) lastaddr - (long) newaddr;
186 xdrmem_inline (XDR *xdrs, int len)
190 if (xdrs->x_handy >= len)
192 xdrs->x_handy -= len;
193 buf = (int32_t *) xdrs->x_private;
194 xdrs->x_private += len;
200 * Gets the next word from the memory referenced by xdrs and places it
201 * in the int pointed to by ip. It then increments the private word to
202 * point at the next element. Neither object pointed to is const
205 xdrmem_getint32 (XDR *xdrs, int32_t *ip)
207 if ((xdrs->x_handy -= 4) < 0)
209 *ip = ntohl ((*((int32_t *) (xdrs->x_private))));
210 xdrs->x_private += 4;
215 * Puts the long pointed to by lp in the memory referenced by xdrs. It
216 * then increments the private word to point at the next element. The
217 * long pointed at is const
220 xdrmem_putint32 (XDR *xdrs, const int32_t *ip)
222 if ((xdrs->x_handy -= 4) < 0)
224 *(int32_t *) xdrs->x_private = htonl (*ip);
225 xdrs->x_private += 4;