1 /* $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $ */
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32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char *sccsid2 = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
34 static char *sccsid = "@(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC";
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
40 * xdr_mem.h, XDR implementation using memory buffers.
42 * Copyright (C) 1984, Sun Microsystems, Inc.
44 * If you have some data to be interpreted as external data representation
45 * or to be converted to external data representation in a memory buffer,
46 * then this is the package for you.
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/malloc.h>
54 #include <rpc/types.h>
57 #define memmove(dst, src, len) bcopy(src, dst, len)
59 static void xdrmem_destroy(XDR *);
60 static bool_t xdrmem_getlong_aligned(XDR *, long *);
61 static bool_t xdrmem_putlong_aligned(XDR *, const long *);
62 static bool_t xdrmem_getlong_unaligned(XDR *, long *);
63 static bool_t xdrmem_putlong_unaligned(XDR *, const long *);
64 static bool_t xdrmem_getbytes(XDR *, char *, u_int);
65 static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
66 /* XXX: w/64-bit pointers, u_int not enough! */
67 static u_int xdrmem_getpos(XDR *);
68 static bool_t xdrmem_setpos(XDR *, u_int);
69 static int32_t *xdrmem_inline_aligned(XDR *, u_int);
70 static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
72 static const struct xdr_ops xdrmem_ops_aligned = {
73 xdrmem_getlong_aligned,
74 xdrmem_putlong_aligned,
79 xdrmem_inline_aligned,
83 static const struct xdr_ops xdrmem_ops_unaligned = {
84 xdrmem_getlong_unaligned,
85 xdrmem_putlong_unaligned,
90 xdrmem_inline_unaligned,
95 * The procedure xdrmem_create initializes a stream descriptor for a
99 xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op)
103 xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
104 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
105 xdrs->x_private = xdrs->x_base = addr;
106 xdrs->x_handy = size;
111 xdrmem_destroy(XDR *xdrs)
117 xdrmem_getlong_aligned(XDR *xdrs, long *lp)
120 if (xdrs->x_handy < sizeof(int32_t))
122 xdrs->x_handy -= sizeof(int32_t);
123 *lp = ntohl(*(u_int32_t *)xdrs->x_private);
124 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
129 xdrmem_putlong_aligned(XDR *xdrs, const long *lp)
132 if (xdrs->x_handy < sizeof(int32_t))
134 xdrs->x_handy -= sizeof(int32_t);
135 *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
136 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
141 xdrmem_getlong_unaligned(XDR *xdrs, long *lp)
145 if (xdrs->x_handy < sizeof(int32_t))
147 xdrs->x_handy -= sizeof(int32_t);
148 memmove(&l, xdrs->x_private, sizeof(int32_t));
150 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
155 xdrmem_putlong_unaligned(XDR *xdrs, const long *lp)
159 if (xdrs->x_handy < sizeof(int32_t))
161 xdrs->x_handy -= sizeof(int32_t);
162 l = htonl((u_int32_t)*lp);
163 memmove(xdrs->x_private, &l, sizeof(int32_t));
164 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
169 xdrmem_getbytes(XDR *xdrs, char *addr, u_int len)
172 if (xdrs->x_handy < len)
174 xdrs->x_handy -= len;
175 memmove(addr, xdrs->x_private, len);
176 xdrs->x_private = (char *)xdrs->x_private + len;
181 xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len)
184 if (xdrs->x_handy < len)
186 xdrs->x_handy -= len;
187 memmove(xdrs->x_private, addr, len);
188 xdrs->x_private = (char *)xdrs->x_private + len;
193 xdrmem_getpos(XDR *xdrs)
196 /* XXX w/64-bit pointers, u_int not enough! */
197 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
201 xdrmem_setpos(XDR *xdrs, u_int pos)
203 char *newaddr = xdrs->x_base + pos;
204 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
206 if (newaddr > lastaddr)
208 xdrs->x_private = newaddr;
209 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
214 xdrmem_inline_aligned(XDR *xdrs, u_int len)
218 if (xdrs->x_handy >= len) {
219 xdrs->x_handy -= len;
220 buf = (int32_t *)xdrs->x_private;
221 xdrs->x_private = (char *)xdrs->x_private + len;
228 xdrmem_inline_unaligned(XDR *xdrs, u_int len)