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 /* 41 * xdr_array.c, Generic XDR routines implementation. 42 * 43 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 44 * arrays. See xdr.h for more info on the interface to xdr. 45 */ 46 47 #include "namespace.h" 48 #include <err.h> 49 #include <limits.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 54 #include <rpc/types.h> 55 #include <rpc/xdr.h> 56 #include "un-namespace.h" 57 58 /* 59 * XDR an array of arbitrary elements 60 * *addrp is a pointer to the array, *sizep is the number of elements. 61 * If addrp is NULL (*sizep * elsize) bytes are allocated. 62 * elsize is the size (in bytes) of each element, and elproc is the 63 * xdr procedure to call to handle each element of the array. 64 */ 65 bool_t 66 xdr_array(XDR *xdrs, caddr_t *addrp, u_int *sizep, u_int maxsize, u_int elsize, xdrproc_t elproc) 67 /* 68 * XDR *xdrs; 69 * caddr_t *addrp; // array pointer 70 * u_int *sizep; // number of elements 71 * u_int maxsize; // max numberof elements 72 * u_int elsize; // size in bytes of each element 73 * xdrproc_t elproc; // xdr routine to handle each element 74 */ 75 { 76 u_int i; 77 caddr_t target = *addrp; 78 u_int c; /* the actual element count */ 79 bool_t stat = TRUE; 80 u_int nodesize; 81 82 /* like strings, arrays are really counted arrays */ 83 if (!xdr_u_int(xdrs, sizep)) { 84 return (FALSE); 85 } 86 c = *sizep; 87 if ((c > maxsize || UINT_MAX/elsize < c) && 88 (xdrs->x_op != XDR_FREE)) { 89 return (FALSE); 90 } 91 nodesize = c * elsize; 92 93 /* 94 * if we are deserializing, we may need to allocate an array. 95 * We also save time by checking for a null array if we are freeing. 96 */ 97 if (target == NULL) 98 switch (xdrs->x_op) { 99 case XDR_DECODE: 100 if (c == 0) 101 return (TRUE); 102 *addrp = target = mem_alloc(nodesize); 103 if (target == NULL) { 104 warnx("xdr_array: out of memory"); 105 return (FALSE); 106 } 107 memset(target, 0, nodesize); 108 break; 109 110 case XDR_FREE: 111 return (TRUE); 112 113 case XDR_ENCODE: 114 break; 115 } 116 117 /* 118 * now we xdr each element of array 119 */ 120 for (i = 0; (i < c) && stat; i++) { 121 stat = (*elproc)(xdrs, target); 122 target += elsize; 123 } 124 125 /* 126 * the array may need freeing 127 */ 128 if (xdrs->x_op == XDR_FREE) { 129 mem_free(*addrp, nodesize); 130 *addrp = NULL; 131 } 132 return (stat); 133 } 134 135 /* 136 * xdr_vector(): 137 * 138 * XDR a fixed length array. Unlike variable-length arrays, 139 * the storage of fixed length arrays is static and unfreeable. 140 * > basep: base of the array 141 * > size: size of the array 142 * > elemsize: size of each element 143 * > xdr_elem: routine to XDR each element 144 */ 145 bool_t 146 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize, xdrproc_t xdr_elem) 147 { 148 u_int i; 149 char *elptr; 150 151 elptr = basep; 152 for (i = 0; i < nelem; i++) { 153 if (!(*xdr_elem)(xdrs, elptr)) { 154 return(FALSE); 155 } 156 elptr += elemsize; 157 } 158 return(TRUE); 159 } 160