1 /* $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $ */
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32 #include <sys/cdefs.h>
34 * xdr_mem.h, XDR implementation using memory buffers.
36 * Copyright (C) 1984, Sun Microsystems, Inc.
38 * If you have some data to be interpreted as external data representation
39 * or to be converted to external data representation in a memory buffer,
40 * then this is the package for you.
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/malloc.h>
48 #include <rpc/types.h>
51 static void xdrmem_destroy(XDR *);
52 static bool_t xdrmem_getlong_aligned(XDR *, long *);
53 static bool_t xdrmem_putlong_aligned(XDR *, const long *);
54 static bool_t xdrmem_getlong_unaligned(XDR *, long *);
55 static bool_t xdrmem_putlong_unaligned(XDR *, const long *);
56 static bool_t xdrmem_getbytes(XDR *, char *, u_int);
57 static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
58 /* XXX: w/64-bit pointers, u_int not enough! */
59 static u_int xdrmem_getpos(XDR *);
60 static bool_t xdrmem_setpos(XDR *, u_int);
61 static int32_t *xdrmem_inline_aligned(XDR *, u_int);
62 static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
63 static bool_t xdrmem_control(XDR *xdrs, int request, void *info);
65 static const struct xdr_ops xdrmem_ops_aligned = {
66 xdrmem_getlong_aligned,
67 xdrmem_putlong_aligned,
72 xdrmem_inline_aligned,
77 static const struct xdr_ops xdrmem_ops_unaligned = {
78 xdrmem_getlong_unaligned,
79 xdrmem_putlong_unaligned,
84 xdrmem_inline_unaligned,
90 * The procedure xdrmem_create initializes a stream descriptor for a
94 xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op)
98 xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
99 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
100 xdrs->x_private = xdrs->x_base = addr;
101 xdrs->x_handy = size;
106 xdrmem_destroy(XDR *xdrs)
112 xdrmem_getlong_aligned(XDR *xdrs, long *lp)
115 if (xdrs->x_handy < sizeof(int32_t))
117 xdrs->x_handy -= sizeof(int32_t);
118 *lp = ntohl(*(uint32_t *)xdrs->x_private);
119 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
124 xdrmem_putlong_aligned(XDR *xdrs, const long *lp)
127 if (xdrs->x_handy < sizeof(int32_t))
129 xdrs->x_handy -= sizeof(int32_t);
130 *(uint32_t *)xdrs->x_private = htonl((uint32_t)*lp);
131 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
136 xdrmem_getlong_unaligned(XDR *xdrs, long *lp)
140 if (xdrs->x_handy < sizeof(int32_t))
142 xdrs->x_handy -= sizeof(int32_t);
143 memmove(&l, xdrs->x_private, sizeof(int32_t));
145 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
150 xdrmem_putlong_unaligned(XDR *xdrs, const long *lp)
154 if (xdrs->x_handy < sizeof(int32_t))
156 xdrs->x_handy -= sizeof(int32_t);
157 l = htonl((uint32_t)*lp);
158 memmove(xdrs->x_private, &l, sizeof(int32_t));
159 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
164 xdrmem_getbytes(XDR *xdrs, char *addr, u_int len)
167 if (xdrs->x_handy < len)
169 xdrs->x_handy -= len;
170 memmove(addr, xdrs->x_private, len);
171 xdrs->x_private = (char *)xdrs->x_private + len;
176 xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len)
179 if (xdrs->x_handy < len)
181 xdrs->x_handy -= len;
182 memmove(xdrs->x_private, addr, len);
183 xdrs->x_private = (char *)xdrs->x_private + len;
188 xdrmem_getpos(XDR *xdrs)
191 /* XXX w/64-bit pointers, u_int not enough! */
192 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
196 xdrmem_setpos(XDR *xdrs, u_int pos)
198 char *newaddr = xdrs->x_base + pos;
199 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
201 if (newaddr > lastaddr)
203 xdrs->x_private = newaddr;
204 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
209 xdrmem_inline_aligned(XDR *xdrs, u_int len)
213 if (xdrs->x_handy >= len) {
214 xdrs->x_handy -= len;
215 buf = (int32_t *)xdrs->x_private;
216 xdrs->x_private = (char *)xdrs->x_private + len;
223 xdrmem_inline_unaligned(XDR *xdrs, u_int len)
230 xdrmem_control(XDR *xdrs, int request, void *info)
237 case XDR_GET_BYTES_AVAIL:
238 xptr = (xdr_bytesrec *)info;
239 xptr->xc_is_last_record = TRUE;
240 xptr->xc_num_avail = xdrs->x_handy;
245 * Return the next 4 byte unit in the XDR stream.
247 if (xdrs->x_handy < sizeof (int32_t))
250 *l = (int32_t)ntohl((uint32_t)
251 (*((int32_t *)(xdrs->x_private))));
256 * Skip the next N bytes in the XDR stream.
259 len = RNDUP((int)(*l));
260 if (xdrs->x_handy < len)
262 xdrs->x_handy -= len;
263 xdrs->x_private = (char *)xdrs->x_private + len;