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 /* 37 * xdr_array.c, Generic XDR routines implementation. 38 * 39 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 40 * arrays. See xdr.h for more info on the interface to xdr. 41 */ 42 43 #include "namespace.h" 44 #include <err.h> 45 #include <limits.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 50 #include <rpc/types.h> 51 #include <rpc/xdr.h> 52 #include "un-namespace.h" 53 54 /* 55 * XDR an array of arbitrary elements 56 * *addrp is a pointer to the array, *sizep is the number of elements. 57 * If addrp is NULL (*sizep * elsize) bytes are allocated. 58 * elsize is the size (in bytes) of each element, and elproc is the 59 * xdr procedure to call to handle each element of the array. 60 */ 61 bool_t 62 xdr_array(XDR *xdrs, caddr_t *addrp, u_int *sizep, u_int maxsize, u_int elsize, xdrproc_t elproc) 63 /* 64 * XDR *xdrs; 65 * caddr_t *addrp; // array pointer 66 * u_int *sizep; // number of elements 67 * u_int maxsize; // max numberof elements 68 * u_int elsize; // size in bytes of each element 69 * xdrproc_t elproc; // xdr routine to handle each element 70 */ 71 { 72 u_int i; 73 caddr_t target = *addrp; 74 u_int c; /* the actual element count */ 75 bool_t stat = TRUE; 76 u_int nodesize; 77 78 /* like strings, arrays are really counted arrays */ 79 if (!xdr_u_int(xdrs, sizep)) { 80 return (FALSE); 81 } 82 c = *sizep; 83 if ((c > maxsize || UINT_MAX/elsize < c) && 84 (xdrs->x_op != XDR_FREE)) { 85 return (FALSE); 86 } 87 nodesize = c * elsize; 88 89 /* 90 * if we are deserializing, we may need to allocate an array. 91 * We also save time by checking for a null array if we are freeing. 92 */ 93 if (target == NULL) 94 switch (xdrs->x_op) { 95 case XDR_DECODE: 96 if (c == 0) 97 return (TRUE); 98 *addrp = target = mem_alloc(nodesize); 99 if (target == NULL) { 100 warnx("xdr_array: out of memory"); 101 return (FALSE); 102 } 103 memset(target, 0, nodesize); 104 break; 105 106 case XDR_FREE: 107 return (TRUE); 108 109 case XDR_ENCODE: 110 break; 111 } 112 113 /* 114 * now we xdr each element of array 115 */ 116 for (i = 0; (i < c) && stat; i++) { 117 stat = (*elproc)(xdrs, target); 118 target += elsize; 119 } 120 121 /* 122 * the array may need freeing 123 */ 124 if (xdrs->x_op == XDR_FREE) { 125 mem_free(*addrp, nodesize); 126 *addrp = NULL; 127 } 128 return (stat); 129 } 130 131 /* 132 * xdr_vector(): 133 * 134 * XDR a fixed length array. Unlike variable-length arrays, 135 * the storage of fixed length arrays is static and unfreeable. 136 * > basep: base of the array 137 * > size: size of the array 138 * > elemsize: size of each element 139 * > xdr_elem: routine to XDR each element 140 */ 141 bool_t 142 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize, xdrproc_t xdr_elem) 143 { 144 u_int i; 145 char *elptr; 146 147 elptr = basep; 148 for (i = 0; i < nelem; i++) { 149 if (!(*xdr_elem)(xdrs, elptr)) { 150 return(FALSE); 151 } 152 elptr += elemsize; 153 } 154 return(TRUE); 155 } 156