xdr_mem.c revision 331722
1/* $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $ */ 2 3/*- 4 * Copyright (c) 2010, Oracle America, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * * Redistributions in binary form must reproduce the above 13 * copyright notice, this list of conditions and the following 14 * disclaimer in the documentation and/or other materials 15 * provided with the distribution. 16 * * Neither the name of the "Oracle America, Inc." nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34#if defined(LIBC_SCCS) && !defined(lint) 35static char *sccsid2 = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro"; 36static char *sccsid = "@(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC"; 37#endif 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD: stable/11/lib/libc/xdr/xdr_mem.c 331722 2018-03-29 02:50:57Z eadler $"); 40 41/* 42 * xdr_mem.h, XDR implementation using memory buffers. 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(XDR *xdrs, char *addr, u_int size, enum xdr_op op) 102{ 103 104 xdrs->x_op = op; 105 xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1)) 106 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned; 107 xdrs->x_private = xdrs->x_base = addr; 108 xdrs->x_handy = size; 109} 110 111/*ARGSUSED*/ 112static void 113xdrmem_destroy(XDR *xdrs) 114{ 115 116} 117 118static bool_t 119xdrmem_getlong_aligned(XDR *xdrs, long *lp) 120{ 121 122 if (xdrs->x_handy < sizeof(int32_t)) 123 return (FALSE); 124 xdrs->x_handy -= sizeof(int32_t); 125 *lp = ntohl(*(u_int32_t *)xdrs->x_private); 126 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 127 return (TRUE); 128} 129 130static bool_t 131xdrmem_putlong_aligned(XDR *xdrs, const long *lp) 132{ 133 134 if (xdrs->x_handy < sizeof(int32_t)) 135 return (FALSE); 136 xdrs->x_handy -= sizeof(int32_t); 137 *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp); 138 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 139 return (TRUE); 140} 141 142static bool_t 143xdrmem_getlong_unaligned(XDR *xdrs, long *lp) 144{ 145 u_int32_t l; 146 147 if (xdrs->x_handy < sizeof(int32_t)) 148 return (FALSE); 149 xdrs->x_handy -= sizeof(int32_t); 150 memmove(&l, xdrs->x_private, sizeof(int32_t)); 151 *lp = ntohl(l); 152 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 153 return (TRUE); 154} 155 156static bool_t 157xdrmem_putlong_unaligned(XDR *xdrs, const long *lp) 158{ 159 u_int32_t l; 160 161 if (xdrs->x_handy < sizeof(int32_t)) 162 return (FALSE); 163 xdrs->x_handy -= sizeof(int32_t); 164 l = htonl((u_int32_t)*lp); 165 memmove(xdrs->x_private, &l, sizeof(int32_t)); 166 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 167 return (TRUE); 168} 169 170static bool_t 171xdrmem_getbytes(XDR *xdrs, char *addr, u_int len) 172{ 173 174 if (xdrs->x_handy < len) 175 return (FALSE); 176 xdrs->x_handy -= len; 177 memmove(addr, xdrs->x_private, len); 178 xdrs->x_private = (char *)xdrs->x_private + len; 179 return (TRUE); 180} 181 182static bool_t 183xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len) 184{ 185 186 if (xdrs->x_handy < len) 187 return (FALSE); 188 xdrs->x_handy -= len; 189 memmove(xdrs->x_private, addr, len); 190 xdrs->x_private = (char *)xdrs->x_private + len; 191 return (TRUE); 192} 193 194static u_int 195xdrmem_getpos(XDR *xdrs) 196{ 197 198 /* XXX w/64-bit pointers, u_int not enough! */ 199 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base); 200} 201 202static bool_t 203xdrmem_setpos(XDR *xdrs, u_int pos) 204{ 205 char *newaddr = xdrs->x_base + pos; 206 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy; 207 208 if (newaddr > lastaddr) 209 return (FALSE); 210 xdrs->x_private = newaddr; 211 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */ 212 return (TRUE); 213} 214 215static int32_t * 216xdrmem_inline_aligned(XDR *xdrs, u_int len) 217{ 218 int32_t *buf = NULL; 219 220 if (xdrs->x_handy >= len) { 221 xdrs->x_handy -= len; 222 buf = (int32_t *)xdrs->x_private; 223 xdrs->x_private = (char *)xdrs->x_private + len; 224 } 225 return (buf); 226} 227 228/* ARGSUSED */ 229static int32_t * 230xdrmem_inline_unaligned(XDR *xdrs, u_int len) 231{ 232 233 return (0); 234} 235