1 /* $NetBSD: xdr_array.c,v 1.12 2000/01/22 22:19:18 mycroft Exp $ */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31 32 #include <sys/cdefs.h> 33 /* 34 * xdr_array.c, Generic XDR routines implementation. 35 * 36 * Copyright (C) 1984, Sun Microsystems, Inc. 37 * 38 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 39 * arrays. See xdr.h for more info on the interface to xdr. 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/limits.h> 45 #include <sys/malloc.h> 46 47 #include <rpc/types.h> 48 #include <rpc/xdr.h> 49 50 /* 51 * XDR an array of arbitrary elements 52 * *addrp is a pointer to the array, *sizep is the number of elements. 53 * If addrp is NULL (*sizep * elsize) bytes are allocated. 54 * elsize is the size (in bytes) of each element, and elproc is the 55 * xdr procedure to call to handle each element of the array. 56 */ 57 bool_t 58 xdr_array(XDR *xdrs, 59 caddr_t *addrp, /* array pointer */ 60 u_int *sizep, /* number of elements */ 61 u_int maxsize, /* max numberof elements */ 62 u_int elsize, /* size in bytes of each element */ 63 xdrproc_t elproc) /* xdr routine to handle each element */ 64 { 65 u_int i; 66 caddr_t target = *addrp; 67 u_int c; /* the actual element count */ 68 bool_t stat = TRUE; 69 u_int nodesize; 70 71 /* like strings, arrays are really counted arrays */ 72 if (!xdr_u_int(xdrs, sizep)) { 73 return (FALSE); 74 } 75 c = *sizep; 76 if ((c > maxsize || UINT_MAX/elsize < c) && 77 (xdrs->x_op != XDR_FREE)) { 78 return (FALSE); 79 } 80 nodesize = c * elsize; 81 82 /* 83 * if we are deserializing, we may need to allocate an array. 84 * We also save time by checking for a null array if we are freeing. 85 */ 86 if (target == NULL) 87 switch (xdrs->x_op) { 88 case XDR_DECODE: 89 if (c == 0) 90 return (TRUE); 91 *addrp = target = mem_alloc(nodesize); 92 if (target == NULL) { 93 printf("xdr_array: out of memory"); 94 return (FALSE); 95 } 96 memset(target, 0, nodesize); 97 break; 98 99 case XDR_FREE: 100 return (TRUE); 101 102 case XDR_ENCODE: 103 break; 104 } 105 106 /* 107 * now we xdr each element of array 108 */ 109 for (i = 0; (i < c) && stat; i++) { 110 stat = (*elproc)(xdrs, target); 111 target += elsize; 112 } 113 114 /* 115 * the array may need freeing 116 */ 117 if (xdrs->x_op == XDR_FREE) { 118 mem_free(*addrp, nodesize); 119 *addrp = NULL; 120 } 121 return (stat); 122 } 123 124 /* 125 * xdr_vector(): 126 * 127 * XDR a fixed length array. Unlike variable-length arrays, 128 * the storage of fixed length arrays is static and unfreeable. 129 * > basep: base of the array 130 * > size: size of the array 131 * > elemsize: size of each element 132 * > xdr_elem: routine to XDR each element 133 */ 134 bool_t 135 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize, 136 xdrproc_t xdr_elem) 137 { 138 u_int i; 139 char *elptr; 140 141 elptr = basep; 142 for (i = 0; i < nelem; i++) { 143 if (!(*xdr_elem)(xdrs, elptr)) { 144 return(FALSE); 145 } 146 elptr += elemsize; 147 } 148 return(TRUE); 149 } 150