xdr_mem.c revision 21062
1/* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 */ 29 30#if defined(LIBC_SCCS) && !defined(lint) 31/*static char *sccsid = "from: @(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";*/ 32/*static char *sccsid = "from: @(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC";*/ 33static char *rcsid = "$Id: xdr_mem.c,v 1.3 1995/10/22 14:53:55 phk Exp $"; 34#endif 35 36/* 37 * xdr_mem.h, XDR implementation using memory buffers. 38 * 39 * Copyright (C) 1984, Sun Microsystems, Inc. 40 * 41 * If you have some data to be interpreted as external data representation 42 * or to be converted to external data representation in a memory buffer, 43 * then this is the package for you. 44 * 45 */ 46 47#include <string.h> 48#include <rpc/types.h> 49#include <rpc/xdr.h> 50#include <netinet/in.h> 51 52static bool_t xdrmem_getlong_aligned(); 53static bool_t xdrmem_putlong_aligned(); 54static bool_t xdrmem_getlong_unaligned(); 55static bool_t xdrmem_putlong_unaligned(); 56static bool_t xdrmem_getbytes(); 57static bool_t xdrmem_putbytes(); 58static u_int xdrmem_getpos(); /* XXX w/64-bit pointers, u_int not enough! */ 59static bool_t xdrmem_setpos(); 60static int32_t *xdrmem_inline_aligned(); 61static int32_t *xdrmem_inline_unaligned(); 62static void xdrmem_destroy(); 63 64static struct xdr_ops xdrmem_ops_aligned = { 65 xdrmem_getlong_aligned, 66 xdrmem_putlong_aligned, 67 xdrmem_getbytes, 68 xdrmem_putbytes, 69 xdrmem_getpos, 70 xdrmem_setpos, 71 xdrmem_inline_aligned, 72 xdrmem_destroy 73}; 74 75static struct xdr_ops xdrmem_ops_unaligned = { 76 xdrmem_getlong_unaligned, 77 xdrmem_putlong_unaligned, 78 xdrmem_getbytes, 79 xdrmem_putbytes, 80 xdrmem_getpos, 81 xdrmem_setpos, 82 xdrmem_inline_unaligned, 83 xdrmem_destroy 84}; 85 86/* 87 * The procedure xdrmem_create initializes a stream descriptor for a 88 * memory buffer. 89 */ 90void 91xdrmem_create(xdrs, addr, size, op) 92 register XDR *xdrs; 93 caddr_t addr; 94 u_int size; 95 enum xdr_op op; 96{ 97 98 xdrs->x_op = op; 99 xdrs->x_ops = ((size_t)addr & (sizeof(int32_t) - 1)) 100 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned; 101 xdrs->x_private = xdrs->x_base = addr; 102 xdrs->x_handy = size; 103} 104 105static void 106xdrmem_destroy(/*xdrs*/) 107 /*XDR *xdrs;*/ 108{ 109 110} 111 112static bool_t 113xdrmem_getlong_aligned(xdrs, lp) 114 register XDR *xdrs; 115 long *lp; 116{ 117 118 if ((xdrs->x_handy -= sizeof(int32_t)) < 0) 119 return (FALSE); 120 *lp = ntohl(*(int32_t *)(xdrs->x_private)); 121 xdrs->x_private += sizeof(int32_t); 122 return (TRUE); 123} 124 125static bool_t 126xdrmem_putlong_aligned(xdrs, lp) 127 register XDR *xdrs; 128 long *lp; 129{ 130 131 if ((xdrs->x_handy -= sizeof(int32_t)) < 0) 132 return (FALSE); 133 *(int32_t *)xdrs->x_private = htonl(*lp); 134 xdrs->x_private += sizeof(int32_t); 135 return (TRUE); 136} 137 138static bool_t 139xdrmem_getlong_unaligned(xdrs, lp) 140 register XDR *xdrs; 141 long *lp; 142{ 143 int32_t l; 144 145 if ((xdrs->x_handy -= sizeof(int32_t)) < 0) 146 return (FALSE); 147 memcpy(&l, xdrs->x_private, sizeof(int32_t)); 148 *lp = ntohl(l); 149 xdrs->x_private += sizeof(int32_t); 150 return (TRUE); 151} 152 153static bool_t 154xdrmem_putlong_unaligned(xdrs, lp) 155 register XDR *xdrs; 156 long *lp; 157{ 158 int32_t l; 159 160 if ((xdrs->x_handy -= sizeof(int32_t)) < 0) 161 return (FALSE); 162 l = htonl(*lp); 163 memcpy(xdrs->x_private, &l, sizeof(int32_t)); 164 xdrs->x_private += sizeof(int32_t); 165 return (TRUE); 166} 167 168static bool_t 169xdrmem_getbytes(xdrs, addr, len) 170 register XDR *xdrs; 171 caddr_t addr; 172 register u_int len; 173{ 174 175 if ((xdrs->x_handy -= len) < 0) 176 return (FALSE); 177 memcpy(addr, xdrs->x_private, len); 178 xdrs->x_private += len; 179 return (TRUE); 180} 181 182static bool_t 183xdrmem_putbytes(xdrs, addr, len) 184 register XDR *xdrs; 185 caddr_t addr; 186 register u_int len; 187{ 188 189 if ((xdrs->x_handy -= len) < 0) 190 return (FALSE); 191 memcpy(xdrs->x_private, addr, len); 192 xdrs->x_private += len; 193 return (TRUE); 194} 195 196static u_int 197xdrmem_getpos(xdrs) 198 register XDR *xdrs; 199{ 200 201 /* XXX w/64-bit pointers, u_int not enough! */ 202 return ((u_long)xdrs->x_private - (u_long)xdrs->x_base); 203} 204 205static bool_t 206xdrmem_setpos(xdrs, pos) 207 register XDR *xdrs; 208 u_int pos; 209{ 210 register caddr_t newaddr = xdrs->x_base + pos; 211 register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy; 212 213 if ((long)newaddr > (long)lastaddr) 214 return (FALSE); 215 xdrs->x_private = newaddr; 216 xdrs->x_handy = (long)lastaddr - (long)newaddr; 217 return (TRUE); 218} 219 220static int32_t * 221xdrmem_inline_aligned(xdrs, len) 222 register XDR *xdrs; 223 int len; 224{ 225 int32_t *buf = 0; 226 227 if (xdrs->x_handy >= len) { 228 xdrs->x_handy -= len; 229 buf = (int32_t *) xdrs->x_private; 230 xdrs->x_private += len; 231 } 232 return (buf); 233} 234 235static int32_t * 236xdrmem_inline_unaligned(xdrs, len) 237 register XDR *xdrs; 238 int len; 239{ 240 241 return (0); 242} 243