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) 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"; 35 #endif 36 #include <sys/cdefs.h> 37 /* 38 * xdr_mem.h, XDR implementation using memory buffers. 39 * 40 * Copyright (C) 1984, Sun Microsystems, Inc. 41 * 42 * If you have some data to be interpreted as external data representation 43 * or to be converted to external data representation in a memory buffer, 44 * then this is the package for you. 45 * 46 */ 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/malloc.h> 51 52 #include <rpc/types.h> 53 #include <rpc/xdr.h> 54 55 static void xdrmem_destroy(XDR *); 56 static bool_t xdrmem_getlong_aligned(XDR *, long *); 57 static bool_t xdrmem_putlong_aligned(XDR *, const long *); 58 static bool_t xdrmem_getlong_unaligned(XDR *, long *); 59 static bool_t xdrmem_putlong_unaligned(XDR *, const long *); 60 static bool_t xdrmem_getbytes(XDR *, char *, u_int); 61 static bool_t xdrmem_putbytes(XDR *, const char *, u_int); 62 /* XXX: w/64-bit pointers, u_int not enough! */ 63 static u_int xdrmem_getpos(XDR *); 64 static bool_t xdrmem_setpos(XDR *, u_int); 65 static int32_t *xdrmem_inline_aligned(XDR *, u_int); 66 static int32_t *xdrmem_inline_unaligned(XDR *, u_int); 67 static bool_t xdrmem_control(XDR *xdrs, int request, void *info); 68 69 static const struct xdr_ops xdrmem_ops_aligned = { 70 xdrmem_getlong_aligned, 71 xdrmem_putlong_aligned, 72 xdrmem_getbytes, 73 xdrmem_putbytes, 74 xdrmem_getpos, 75 xdrmem_setpos, 76 xdrmem_inline_aligned, 77 xdrmem_destroy, 78 xdrmem_control 79 }; 80 81 static const struct xdr_ops xdrmem_ops_unaligned = { 82 xdrmem_getlong_unaligned, 83 xdrmem_putlong_unaligned, 84 xdrmem_getbytes, 85 xdrmem_putbytes, 86 xdrmem_getpos, 87 xdrmem_setpos, 88 xdrmem_inline_unaligned, 89 xdrmem_destroy, 90 xdrmem_control 91 }; 92 93 /* 94 * The procedure xdrmem_create initializes a stream descriptor for a 95 * memory buffer. 96 */ 97 void 98 xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op) 99 { 100 101 xdrs->x_op = op; 102 xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1)) 103 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned; 104 xdrs->x_private = xdrs->x_base = addr; 105 xdrs->x_handy = size; 106 } 107 108 /*ARGSUSED*/ 109 static void 110 xdrmem_destroy(XDR *xdrs) 111 { 112 113 } 114 115 static bool_t 116 xdrmem_getlong_aligned(XDR *xdrs, long *lp) 117 { 118 119 if (xdrs->x_handy < sizeof(int32_t)) 120 return (FALSE); 121 xdrs->x_handy -= sizeof(int32_t); 122 *lp = ntohl(*(uint32_t *)xdrs->x_private); 123 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 124 return (TRUE); 125 } 126 127 static bool_t 128 xdrmem_putlong_aligned(XDR *xdrs, const long *lp) 129 { 130 131 if (xdrs->x_handy < sizeof(int32_t)) 132 return (FALSE); 133 xdrs->x_handy -= sizeof(int32_t); 134 *(uint32_t *)xdrs->x_private = htonl((uint32_t)*lp); 135 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 136 return (TRUE); 137 } 138 139 static bool_t 140 xdrmem_getlong_unaligned(XDR *xdrs, long *lp) 141 { 142 uint32_t l; 143 144 if (xdrs->x_handy < sizeof(int32_t)) 145 return (FALSE); 146 xdrs->x_handy -= sizeof(int32_t); 147 memmove(&l, xdrs->x_private, sizeof(int32_t)); 148 *lp = ntohl(l); 149 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 150 return (TRUE); 151 } 152 153 static bool_t 154 xdrmem_putlong_unaligned(XDR *xdrs, const long *lp) 155 { 156 uint32_t l; 157 158 if (xdrs->x_handy < sizeof(int32_t)) 159 return (FALSE); 160 xdrs->x_handy -= sizeof(int32_t); 161 l = htonl((uint32_t)*lp); 162 memmove(xdrs->x_private, &l, sizeof(int32_t)); 163 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t); 164 return (TRUE); 165 } 166 167 static bool_t 168 xdrmem_getbytes(XDR *xdrs, char *addr, u_int len) 169 { 170 171 if (xdrs->x_handy < len) 172 return (FALSE); 173 xdrs->x_handy -= len; 174 memmove(addr, xdrs->x_private, len); 175 xdrs->x_private = (char *)xdrs->x_private + len; 176 return (TRUE); 177 } 178 179 static bool_t 180 xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len) 181 { 182 183 if (xdrs->x_handy < len) 184 return (FALSE); 185 xdrs->x_handy -= len; 186 memmove(xdrs->x_private, addr, len); 187 xdrs->x_private = (char *)xdrs->x_private + len; 188 return (TRUE); 189 } 190 191 static u_int 192 xdrmem_getpos(XDR *xdrs) 193 { 194 195 /* XXX w/64-bit pointers, u_int not enough! */ 196 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base); 197 } 198 199 static bool_t 200 xdrmem_setpos(XDR *xdrs, u_int pos) 201 { 202 char *newaddr = xdrs->x_base + pos; 203 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy; 204 205 if (newaddr > lastaddr) 206 return (FALSE); 207 xdrs->x_private = newaddr; 208 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */ 209 return (TRUE); 210 } 211 212 static int32_t * 213 xdrmem_inline_aligned(XDR *xdrs, u_int len) 214 { 215 int32_t *buf = NULL; 216 217 if (xdrs->x_handy >= len) { 218 xdrs->x_handy -= len; 219 buf = (int32_t *)xdrs->x_private; 220 xdrs->x_private = (char *)xdrs->x_private + len; 221 } 222 return (buf); 223 } 224 225 /* ARGSUSED */ 226 static int32_t * 227 xdrmem_inline_unaligned(XDR *xdrs, u_int len) 228 { 229 230 return (0); 231 } 232 233 static bool_t 234 xdrmem_control(XDR *xdrs, int request, void *info) 235 { 236 xdr_bytesrec *xptr; 237 int32_t *l; 238 int len; 239 240 switch (request) { 241 case XDR_GET_BYTES_AVAIL: 242 xptr = (xdr_bytesrec *)info; 243 xptr->xc_is_last_record = TRUE; 244 xptr->xc_num_avail = xdrs->x_handy; 245 return (TRUE); 246 247 case XDR_PEEK: 248 /* 249 * Return the next 4 byte unit in the XDR stream. 250 */ 251 if (xdrs->x_handy < sizeof (int32_t)) 252 return (FALSE); 253 l = (int32_t *)info; 254 *l = (int32_t)ntohl((uint32_t) 255 (*((int32_t *)(xdrs->x_private)))); 256 return (TRUE); 257 258 case XDR_SKIPBYTES: 259 /* 260 * Skip the next N bytes in the XDR stream. 261 */ 262 l = (int32_t *)info; 263 len = RNDUP((int)(*l)); 264 if (xdrs->x_handy < len) 265 return (FALSE); 266 xdrs->x_handy -= len; 267 xdrs->x_private = (char *)xdrs->x_private + len; 268 return (TRUE); 269 } 270 return (FALSE); 271 } 272