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("$FreeBSD$"); 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 57static void xdrmem_destroy(XDR *); 58static bool_t xdrmem_getlong_aligned(XDR *, long *); 59static bool_t xdrmem_putlong_aligned(XDR *, const long *); 60static bool_t xdrmem_getlong_unaligned(XDR *, long *); 61static bool_t xdrmem_putlong_unaligned(XDR *, const long *); 62static bool_t xdrmem_getbytes(XDR *, char *, u_int); 63static bool_t xdrmem_putbytes(XDR *, const char *, u_int); 64/* XXX: w/64-bit pointers, u_int not enough! */ 65static u_int xdrmem_getpos(XDR *); 66static bool_t xdrmem_setpos(XDR *, u_int); 67static int32_t *xdrmem_inline_aligned(XDR *, u_int); 68static int32_t *xdrmem_inline_unaligned(XDR *, u_int); 69static bool_t xdrmem_control(XDR *xdrs, int request, void *info); 70 71static const struct xdr_ops xdrmem_ops_aligned = { 72 xdrmem_getlong_aligned, 73 xdrmem_putlong_aligned, 74 xdrmem_getbytes, 75 xdrmem_putbytes, 76 xdrmem_getpos, 77 xdrmem_setpos, 78 xdrmem_inline_aligned, 79 xdrmem_destroy, 80 xdrmem_control 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 xdrmem_control 93}; 94 95/* 96 * The procedure xdrmem_create initializes a stream descriptor for a 97 * memory buffer. 98 */ 99void 100xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op) 101{ 102 103 xdrs->x_op = op; 104 xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1)) 105 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned; 106 xdrs->x_private = xdrs->x_base = addr; 107 xdrs->x_handy = size; 108} 109 110/*ARGSUSED*/ 111static void 112xdrmem_destroy(XDR *xdrs) 113{ 114 115} 116 117static bool_t 118xdrmem_getlong_aligned(XDR *xdrs, long *lp) 119{ 120 121 if (xdrs->x_handy < sizeof(int32_t)) 122 return (FALSE); 123 xdrs->x_handy -= sizeof(int32_t); 124 *lp = ntohl(*(u_int32_t *)xdrs->x_private); 125 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 126 return (TRUE); 127} 128 129static bool_t 130xdrmem_putlong_aligned(XDR *xdrs, const long *lp) 131{ 132 133 if (xdrs->x_handy < sizeof(int32_t)) 134 return (FALSE); 135 xdrs->x_handy -= sizeof(int32_t); 136 *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp); 137 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 138 return (TRUE); 139} 140 141static bool_t 142xdrmem_getlong_unaligned(XDR *xdrs, long *lp) 143{ 144 u_int32_t l; 145 146 if (xdrs->x_handy < sizeof(int32_t)) 147 return (FALSE); 148 xdrs->x_handy -= sizeof(int32_t); 149 memmove(&l, xdrs->x_private, sizeof(int32_t)); 150 *lp = ntohl(l); 151 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 152 return (TRUE); 153} 154 155static bool_t 156xdrmem_putlong_unaligned(XDR *xdrs, const long *lp) 157{ 158 u_int32_t l; 159 160 if (xdrs->x_handy < sizeof(int32_t)) 161 return (FALSE); 162 xdrs->x_handy -= sizeof(int32_t); 163 l = htonl((u_int32_t)*lp); 164 memmove(xdrs->x_private, &l, sizeof(int32_t)); 165 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 166 return (TRUE); 167} 168 169static bool_t 170xdrmem_getbytes(XDR *xdrs, char *addr, u_int len) 171{ 172 173 if (xdrs->x_handy < len) 174 return (FALSE); 175 xdrs->x_handy -= len; 176 memmove(addr, xdrs->x_private, len); 177 xdrs->x_private = (char *)xdrs->x_private + len; 178 return (TRUE); 179} 180 181static bool_t 182xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len) 183{ 184 185 if (xdrs->x_handy < len) 186 return (FALSE); 187 xdrs->x_handy -= len; 188 memmove(xdrs->x_private, addr, len); 189 xdrs->x_private = (char *)xdrs->x_private + len; 190 return (TRUE); 191} 192 193static u_int 194xdrmem_getpos(XDR *xdrs) 195{ 196 197 /* XXX w/64-bit pointers, u_int not enough! */ 198 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base); 199} 200 201static bool_t 202xdrmem_setpos(XDR *xdrs, u_int pos) 203{ 204 char *newaddr = xdrs->x_base + pos; 205 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy; 206 207 if (newaddr > lastaddr) 208 return (FALSE); 209 xdrs->x_private = newaddr; 210 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */ 211 return (TRUE); 212} 213 214static int32_t * 215xdrmem_inline_aligned(XDR *xdrs, u_int len) 216{ 217 int32_t *buf = 0; 218 219 if (xdrs->x_handy >= len) { 220 xdrs->x_handy -= len; 221 buf = (int32_t *)xdrs->x_private; 222 xdrs->x_private = (char *)xdrs->x_private + len; 223 } 224 return (buf); 225} 226 227/* ARGSUSED */ 228static int32_t * 229xdrmem_inline_unaligned(XDR *xdrs, u_int len) 230{ 231 232 return (0); 233} 234 235static bool_t 236xdrmem_control(XDR *xdrs, int request, void *info) 237{ 238 xdr_bytesrec *xptr; 239 int32_t *l; 240 int len; 241 242 switch (request) { 243 244 case XDR_GET_BYTES_AVAIL: 245 xptr = (xdr_bytesrec *)info; 246 xptr->xc_is_last_record = TRUE; 247 xptr->xc_num_avail = xdrs->x_handy; 248 return (TRUE); 249 250 case XDR_PEEK: 251 /* 252 * Return the next 4 byte unit in the XDR stream. 253 */ 254 if (xdrs->x_handy < sizeof (int32_t)) 255 return (FALSE); 256 l = (int32_t *)info; 257 *l = (int32_t)ntohl((uint32_t) 258 (*((int32_t *)(xdrs->x_private)))); 259 return (TRUE); 260 261 case XDR_SKIPBYTES: 262 /* 263 * Skip the next N bytes in the XDR stream. 264 */ 265 l = (int32_t *)info; 266 len = RNDUP((int)(*l)); 267 if (xdrs->x_handy < len) 268 return (FALSE); 269 xdrs->x_handy -= len; 270 xdrs->x_private = (char *)xdrs->x_private + len; 271 return (TRUE); 272 273 } 274 return (FALSE); 275} 276