xdr_mem.c revision 177633
1/* $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $ */ 2 3/* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31 32#if defined(LIBC_SCCS) && !defined(lint) 33static char *sccsid2 = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro"; 34static char *sccsid = "@(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC"; 35#endif 36#include <sys/cdefs.h> 37__FBSDID("$FreeBSD: head/sys/xdr/xdr_mem.c 177633 2008-03-26 15:23:12Z dfr $"); 38 39/* 40 * xdr_mem.h, XDR implementation using memory buffers. 41 * 42 * Copyright (C) 1984, Sun Microsystems, Inc. 43 * 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. 47 * 48 */ 49 50#include <sys/param.h> 51#include <sys/systm.h> 52#include <sys/malloc.h> 53 54#include <rpc/types.h> 55#include <rpc/xdr.h> 56 57#define memmove(dst, src, len) bcopy(src, dst, len) 58 59static void xdrmem_destroy(XDR *); 60static bool_t xdrmem_getlong_aligned(XDR *, long *); 61static bool_t xdrmem_putlong_aligned(XDR *, const long *); 62static bool_t xdrmem_getlong_unaligned(XDR *, long *); 63static bool_t xdrmem_putlong_unaligned(XDR *, const long *); 64static bool_t xdrmem_getbytes(XDR *, char *, u_int); 65static bool_t xdrmem_putbytes(XDR *, const char *, u_int); 66/* XXX: w/64-bit pointers, u_int not enough! */ 67static u_int xdrmem_getpos(XDR *); 68static bool_t xdrmem_setpos(XDR *, u_int); 69static int32_t *xdrmem_inline_aligned(XDR *, u_int); 70static int32_t *xdrmem_inline_unaligned(XDR *, u_int); 71 72static const struct xdr_ops xdrmem_ops_aligned = { 73 xdrmem_getlong_aligned, 74 xdrmem_putlong_aligned, 75 xdrmem_getbytes, 76 xdrmem_putbytes, 77 xdrmem_getpos, 78 xdrmem_setpos, 79 xdrmem_inline_aligned, 80 xdrmem_destroy 81}; 82 83static const struct xdr_ops xdrmem_ops_unaligned = { 84 xdrmem_getlong_unaligned, 85 xdrmem_putlong_unaligned, 86 xdrmem_getbytes, 87 xdrmem_putbytes, 88 xdrmem_getpos, 89 xdrmem_setpos, 90 xdrmem_inline_unaligned, 91 xdrmem_destroy 92}; 93 94/* 95 * The procedure xdrmem_create initializes a stream descriptor for a 96 * memory buffer. 97 */ 98void 99xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op) 100{ 101 102 xdrs->x_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; 107} 108 109/*ARGSUSED*/ 110static void 111xdrmem_destroy(XDR *xdrs) 112{ 113 114} 115 116static bool_t 117xdrmem_getlong_aligned(XDR *xdrs, long *lp) 118{ 119 120 if (xdrs->x_handy < sizeof(int32_t)) 121 return (FALSE); 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); 125 return (TRUE); 126} 127 128static bool_t 129xdrmem_putlong_aligned(XDR *xdrs, const long *lp) 130{ 131 132 if (xdrs->x_handy < sizeof(int32_t)) 133 return (FALSE); 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); 137 return (TRUE); 138} 139 140static bool_t 141xdrmem_getlong_unaligned(XDR *xdrs, long *lp) 142{ 143 u_int32_t l; 144 145 if (xdrs->x_handy < sizeof(int32_t)) 146 return (FALSE); 147 xdrs->x_handy -= sizeof(int32_t); 148 memmove(&l, xdrs->x_private, sizeof(int32_t)); 149 *lp = ntohl(l); 150 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 151 return (TRUE); 152} 153 154static bool_t 155xdrmem_putlong_unaligned(XDR *xdrs, const long *lp) 156{ 157 u_int32_t l; 158 159 if (xdrs->x_handy < sizeof(int32_t)) 160 return (FALSE); 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); 165 return (TRUE); 166} 167 168static bool_t 169xdrmem_getbytes(XDR *xdrs, char *addr, u_int len) 170{ 171 172 if (xdrs->x_handy < len) 173 return (FALSE); 174 xdrs->x_handy -= len; 175 memmove(addr, xdrs->x_private, len); 176 xdrs->x_private = (char *)xdrs->x_private + len; 177 return (TRUE); 178} 179 180static bool_t 181xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len) 182{ 183 184 if (xdrs->x_handy < len) 185 return (FALSE); 186 xdrs->x_handy -= len; 187 memmove(xdrs->x_private, addr, len); 188 xdrs->x_private = (char *)xdrs->x_private + len; 189 return (TRUE); 190} 191 192static u_int 193xdrmem_getpos(XDR *xdrs) 194{ 195 196 /* XXX w/64-bit pointers, u_int not enough! */ 197 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base); 198} 199 200static bool_t 201xdrmem_setpos(XDR *xdrs, u_int pos) 202{ 203 char *newaddr = xdrs->x_base + pos; 204 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy; 205 206 if (newaddr > lastaddr) 207 return (FALSE); 208 xdrs->x_private = newaddr; 209 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */ 210 return (TRUE); 211} 212 213static int32_t * 214xdrmem_inline_aligned(XDR *xdrs, u_int len) 215{ 216 int32_t *buf = 0; 217 218 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; 222 } 223 return (buf); 224} 225 226/* ARGSUSED */ 227static int32_t * 228xdrmem_inline_unaligned(XDR *xdrs, u_int len) 229{ 230 231 return (0); 232} 233