1 /* $NetBSD: xdr_array.c,v 1.12 2000/01/22 22:19:18 mycroft Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 2010, Oracle America, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are 10 * met: 11 * 12 * * Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * * Redistributions in binary form must reproduce the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer in the documentation and/or other materials 17 * provided with the distribution. 18 * * Neither the name of the "Oracle America, Inc." nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 29 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 static char *sccsid2 = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro"; 38 static char *sccsid = "@(#)xdr_array.c 2.1 88/07/29 4.0 RPCSRC"; 39 #endif 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 /* 44 * xdr_array.c, Generic XDR routines implementation. 45 * 46 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 47 * arrays. See xdr.h for more info on the interface to xdr. 48 */ 49 50 #include "namespace.h" 51 #include <err.h> 52 #include <limits.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 57 #include <rpc/types.h> 58 #include <rpc/xdr.h> 59 #include "un-namespace.h" 60 61 /* 62 * XDR an array of arbitrary elements 63 * *addrp is a pointer to the array, *sizep is the number of elements. 64 * If addrp is NULL (*sizep * elsize) bytes are allocated. 65 * elsize is the size (in bytes) of each element, and elproc is the 66 * xdr procedure to call to handle each element of the array. 67 */ 68 bool_t 69 xdr_array(XDR *xdrs, caddr_t *addrp, u_int *sizep, u_int maxsize, u_int elsize, xdrproc_t elproc) 70 /* 71 * XDR *xdrs; 72 * caddr_t *addrp; // array pointer 73 * u_int *sizep; // number of elements 74 * u_int maxsize; // max numberof elements 75 * u_int elsize; // size in bytes of each element 76 * xdrproc_t elproc; // xdr routine to handle each element 77 */ 78 { 79 u_int i; 80 caddr_t target = *addrp; 81 u_int c; /* the actual element count */ 82 bool_t stat = TRUE; 83 u_int nodesize; 84 85 /* like strings, arrays are really counted arrays */ 86 if (!xdr_u_int(xdrs, sizep)) { 87 return (FALSE); 88 } 89 c = *sizep; 90 if ((c > maxsize || UINT_MAX/elsize < c) && 91 (xdrs->x_op != XDR_FREE)) { 92 return (FALSE); 93 } 94 nodesize = c * elsize; 95 96 /* 97 * if we are deserializing, we may need to allocate an array. 98 * We also save time by checking for a null array if we are freeing. 99 */ 100 if (target == NULL) 101 switch (xdrs->x_op) { 102 case XDR_DECODE: 103 if (c == 0) 104 return (TRUE); 105 *addrp = target = mem_alloc(nodesize); 106 if (target == NULL) { 107 warnx("xdr_array: out of memory"); 108 return (FALSE); 109 } 110 memset(target, 0, nodesize); 111 break; 112 113 case XDR_FREE: 114 return (TRUE); 115 116 case XDR_ENCODE: 117 break; 118 } 119 120 /* 121 * now we xdr each element of array 122 */ 123 for (i = 0; (i < c) && stat; i++) { 124 stat = (*elproc)(xdrs, target); 125 target += elsize; 126 } 127 128 /* 129 * the array may need freeing 130 */ 131 if (xdrs->x_op == XDR_FREE) { 132 mem_free(*addrp, nodesize); 133 *addrp = NULL; 134 } 135 return (stat); 136 } 137 138 /* 139 * xdr_vector(): 140 * 141 * XDR a fixed length array. Unlike variable-length arrays, 142 * the storage of fixed length arrays is static and unfreeable. 143 * > basep: base of the array 144 * > size: size of the array 145 * > elemsize: size of each element 146 * > xdr_elem: routine to XDR each element 147 */ 148 bool_t 149 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize, xdrproc_t xdr_elem) 150 { 151 u_int i; 152 char *elptr; 153 154 elptr = basep; 155 for (i = 0; i < nelem; i++) { 156 if (!(*xdr_elem)(xdrs, elptr)) { 157 return(FALSE); 158 } 159 elptr += elemsize; 160 } 161 return(TRUE); 162 } 163