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 /* 42 * xdr_array.c, Generic XDR routines implementation. 43 * 44 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 45 * arrays. See xdr.h for more info on the interface to xdr. 46 */ 47 48 #include "namespace.h" 49 #include <err.h> 50 #include <limits.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 55 #include <rpc/types.h> 56 #include <rpc/xdr.h> 57 #include "un-namespace.h" 58 59 /* 60 * XDR an array of arbitrary elements 61 * *addrp is a pointer to the array, *sizep is the number of elements. 62 * If addrp is NULL (*sizep * elsize) bytes are allocated. 63 * elsize is the size (in bytes) of each element, and elproc is the 64 * xdr procedure to call to handle each element of the array. 65 */ 66 bool_t 67 xdr_array(XDR *xdrs, caddr_t *addrp, u_int *sizep, u_int maxsize, u_int elsize, xdrproc_t elproc) 68 /* 69 * XDR *xdrs; 70 * caddr_t *addrp; // array pointer 71 * u_int *sizep; // number of elements 72 * u_int maxsize; // max numberof elements 73 * u_int elsize; // size in bytes of each element 74 * xdrproc_t elproc; // xdr routine to handle each element 75 */ 76 { 77 u_int i; 78 caddr_t target = *addrp; 79 u_int c; /* the actual element count */ 80 bool_t stat = TRUE; 81 u_int nodesize; 82 83 /* like strings, arrays are really counted arrays */ 84 if (!xdr_u_int(xdrs, sizep)) { 85 return (FALSE); 86 } 87 c = *sizep; 88 if ((c > maxsize || UINT_MAX/elsize < c) && 89 (xdrs->x_op != XDR_FREE)) { 90 return (FALSE); 91 } 92 nodesize = c * elsize; 93 94 /* 95 * if we are deserializing, we may need to allocate an array. 96 * We also save time by checking for a null array if we are freeing. 97 */ 98 if (target == NULL) 99 switch (xdrs->x_op) { 100 case XDR_DECODE: 101 if (c == 0) 102 return (TRUE); 103 *addrp = target = mem_alloc(nodesize); 104 if (target == NULL) { 105 warnx("xdr_array: out of memory"); 106 return (FALSE); 107 } 108 memset(target, 0, nodesize); 109 break; 110 111 case XDR_FREE: 112 return (TRUE); 113 114 case XDR_ENCODE: 115 break; 116 } 117 118 /* 119 * now we xdr each element of array 120 */ 121 for (i = 0; (i < c) && stat; i++) { 122 stat = (*elproc)(xdrs, target); 123 target += elsize; 124 } 125 126 /* 127 * the array may need freeing 128 */ 129 if (xdrs->x_op == XDR_FREE) { 130 mem_free(*addrp, nodesize); 131 *addrp = NULL; 132 } 133 return (stat); 134 } 135 136 /* 137 * xdr_vector(): 138 * 139 * XDR a fixed length array. Unlike variable-length arrays, 140 * the storage of fixed length arrays is static and unfreeable. 141 * > basep: base of the array 142 * > size: size of the array 143 * > elemsize: size of each element 144 * > xdr_elem: routine to XDR each element 145 */ 146 bool_t 147 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize, xdrproc_t xdr_elem) 148 { 149 u_int i; 150 char *elptr; 151 152 elptr = basep; 153 for (i = 0; i < nelem; i++) { 154 if (!(*xdr_elem)(xdrs, elptr)) { 155 return(FALSE); 156 } 157 elptr += elemsize; 158 } 159 return(TRUE); 160 } 161