xdr_mem.c revision 92905
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#include <sys/cdefs.h> 33#if defined(LIBC_SCCS) && !defined(lint) 34/*static char *sccsid = "from: @(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";*/ 35/*static char *sccsid = "from: @(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC";*/ 36static char *rcsid = "$FreeBSD: head/lib/libc/xdr/xdr_mem.c 92905 2002-03-21 22:49:10Z obrien $"; 37#endif 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 "namespace.h" 51#include <sys/types.h> 52 53#include <netinet/in.h> 54 55#include <string.h> 56 57#include <rpc/types.h> 58#include <rpc/xdr.h> 59#include "un-namespace.h" 60 61static void xdrmem_destroy(XDR *); 62static bool_t xdrmem_getlong_aligned(XDR *, long *); 63static bool_t xdrmem_putlong_aligned(XDR *, const long *); 64static bool_t xdrmem_getlong_unaligned(XDR *, long *); 65static bool_t xdrmem_putlong_unaligned(XDR *, const long *); 66static bool_t xdrmem_getbytes(XDR *, char *, u_int); 67static bool_t xdrmem_putbytes(XDR *, const char *, u_int); 68/* XXX: w/64-bit pointers, u_int not enough! */ 69static u_int xdrmem_getpos(XDR *); 70static bool_t xdrmem_setpos(XDR *, u_int); 71static int32_t *xdrmem_inline_aligned(XDR *, u_int); 72static int32_t *xdrmem_inline_unaligned(XDR *, u_int); 73 74static const struct xdr_ops xdrmem_ops_aligned = { 75 xdrmem_getlong_aligned, 76 xdrmem_putlong_aligned, 77 xdrmem_getbytes, 78 xdrmem_putbytes, 79 xdrmem_getpos, 80 xdrmem_setpos, 81 xdrmem_inline_aligned, 82 xdrmem_destroy 83}; 84 85static const struct xdr_ops xdrmem_ops_unaligned = { 86 xdrmem_getlong_unaligned, 87 xdrmem_putlong_unaligned, 88 xdrmem_getbytes, 89 xdrmem_putbytes, 90 xdrmem_getpos, 91 xdrmem_setpos, 92 xdrmem_inline_unaligned, 93 xdrmem_destroy 94}; 95 96/* 97 * The procedure xdrmem_create initializes a stream descriptor for a 98 * memory buffer. 99 */ 100void 101xdrmem_create(xdrs, addr, size, op) 102 XDR *xdrs; 103 char *addr; 104 u_int size; 105 enum xdr_op op; 106{ 107 108 xdrs->x_op = op; 109 xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1)) 110 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned; 111 xdrs->x_private = xdrs->x_base = addr; 112 xdrs->x_handy = size; 113} 114 115/*ARGSUSED*/ 116static void 117xdrmem_destroy(xdrs) 118 XDR *xdrs; 119{ 120 121} 122 123static bool_t 124xdrmem_getlong_aligned(xdrs, lp) 125 XDR *xdrs; 126 long *lp; 127{ 128 129 if ((xdrs->x_handy -= sizeof(int32_t)) < 0) 130 return (FALSE); 131 *lp = ntohl(*(u_int32_t *)xdrs->x_private); 132 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 133 return (TRUE); 134} 135 136static bool_t 137xdrmem_putlong_aligned(xdrs, lp) 138 XDR *xdrs; 139 const long *lp; 140{ 141 142 if ((xdrs->x_handy -= sizeof(int32_t)) < 0) 143 return (FALSE); 144 *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp); 145 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 146 return (TRUE); 147} 148 149static bool_t 150xdrmem_getlong_unaligned(xdrs, lp) 151 XDR *xdrs; 152 long *lp; 153{ 154 u_int32_t l; 155 156 if ((xdrs->x_handy -= sizeof(int32_t)) < 0) 157 return (FALSE); 158 memmove(&l, xdrs->x_private, sizeof(int32_t)); 159 *lp = ntohl(l); 160 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 161 return (TRUE); 162} 163 164static bool_t 165xdrmem_putlong_unaligned(xdrs, lp) 166 XDR *xdrs; 167 const long *lp; 168{ 169 u_int32_t l; 170 171 if ((xdrs->x_handy -= sizeof(int32_t)) < 0) 172 return (FALSE); 173 l = htonl((u_int32_t)*lp); 174 memmove(xdrs->x_private, &l, sizeof(int32_t)); 175 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 176 return (TRUE); 177} 178 179static bool_t 180xdrmem_getbytes(xdrs, addr, len) 181 XDR *xdrs; 182 char *addr; 183 u_int len; 184{ 185 186 if ((xdrs->x_handy -= len) < 0) 187 return (FALSE); 188 memmove(addr, xdrs->x_private, len); 189 xdrs->x_private = (char *)xdrs->x_private + len; 190 return (TRUE); 191} 192 193static bool_t 194xdrmem_putbytes(xdrs, addr, len) 195 XDR *xdrs; 196 const char *addr; 197 u_int len; 198{ 199 200 if ((xdrs->x_handy -= len) < 0) 201 return (FALSE); 202 memmove(xdrs->x_private, addr, len); 203 xdrs->x_private = (char *)xdrs->x_private + len; 204 return (TRUE); 205} 206 207static u_int 208xdrmem_getpos(xdrs) 209 XDR *xdrs; 210{ 211 212 /* XXX w/64-bit pointers, u_int not enough! */ 213 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base); 214} 215 216static bool_t 217xdrmem_setpos(xdrs, pos) 218 XDR *xdrs; 219 u_int pos; 220{ 221 char *newaddr = xdrs->x_base + pos; 222 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy; 223 224 if ((long)newaddr > (long)lastaddr) 225 return (FALSE); 226 xdrs->x_private = newaddr; 227 xdrs->x_handy = (int)((long)lastaddr - (long)newaddr); 228 return (TRUE); 229} 230 231static int32_t * 232xdrmem_inline_aligned(xdrs, len) 233 XDR *xdrs; 234 u_int len; 235{ 236 int32_t *buf = 0; 237 238 if (xdrs->x_handy >= len) { 239 xdrs->x_handy -= len; 240 buf = (int32_t *)xdrs->x_private; 241 xdrs->x_private = (char *)xdrs->x_private + len; 242 } 243 return (buf); 244} 245 246/* ARGSUSED */ 247static int32_t * 248xdrmem_inline_unaligned(xdrs, len) 249 XDR *xdrs; 250 u_int len; 251{ 252 253 return (0); 254} 255