1 /* $OpenBSD: xdr_stdio.c,v 1.11 2007/09/17 16:04:24 blambert Exp $ */ 2 /* 3 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 4 * unrestricted use provided that this legend is included on all tape 5 * media and as a part of the software program in whole or part. Users 6 * may copy or modify Sun RPC without charge, but are not authorized 7 * to license or distribute it to anyone else except as part of a product or 8 * program developed by the user. 9 * 10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 13 * 14 * Sun RPC is provided with no support and without any obligation on the 15 * part of Sun Microsystems, Inc. to assist in its use, correction, 16 * modification or enhancement. 17 * 18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 20 * OR ANY PART THEREOF. 21 * 22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 23 * or profits or other special, indirect and consequential damages, even if 24 * Sun has been advised of the possibility of such damages. 25 * 26 * Sun Microsystems, Inc. 27 * 2550 Garcia Avenue 28 * Mountain View, California 94043 29 */ 30 31 /* 32 * xdr_stdio.c, XDR implementation on standard i/o file. 33 * 34 * Copyright (C) 1984, Sun Microsystems, Inc. 35 * 36 * This set of routines implements a XDR on a stdio stream. 37 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes 38 * from the stream. 39 */ 40 41 #include <rpc/types.h> 42 #include <stdio.h> 43 #include <rpc/xdr.h> 44 45 static bool_t xdrstdio_getlong(XDR *, long *); 46 static bool_t xdrstdio_putlong(XDR *, long *); 47 static bool_t xdrstdio_getbytes(XDR *, caddr_t, u_int); 48 static bool_t xdrstdio_putbytes(XDR *, caddr_t, u_int); 49 static u_int xdrstdio_getpos(XDR *); 50 static bool_t xdrstdio_setpos(XDR *, u_int); 51 static int32_t *xdrstdio_inline(XDR *, u_int); 52 static void xdrstdio_destroy(XDR *); 53 54 /* 55 * Ops vector for stdio type XDR 56 */ 57 static struct xdr_ops xdrstdio_ops = { 58 xdrstdio_getlong, /* deserialize a long int */ 59 xdrstdio_putlong, /* serialize a long int */ 60 xdrstdio_getbytes, /* deserialize counted bytes */ 61 xdrstdio_putbytes, /* serialize counted bytes */ 62 xdrstdio_getpos, /* get offset in the stream */ 63 xdrstdio_setpos, /* set offset in the stream */ 64 xdrstdio_inline, /* prime stream for inline macros */ 65 xdrstdio_destroy /* destroy stream */ 66 }; 67 68 /* 69 * Initialize a stdio xdr stream. 70 * Sets the xdr stream handle xdrs for use on the stream file. 71 * Operation flag is set to op. 72 */ 73 void 74 xdrstdio_create(XDR *xdrs, FILE *file, enum xdr_op op) 75 { 76 77 xdrs->x_op = op; 78 xdrs->x_ops = &xdrstdio_ops; 79 xdrs->x_private = (caddr_t)file; 80 xdrs->x_handy = 0; 81 xdrs->x_base = 0; 82 } 83 84 /* 85 * Destroy a stdio xdr stream. 86 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create. 87 */ 88 static void 89 xdrstdio_destroy(XDR *xdrs) 90 { 91 (void)fflush((FILE *)xdrs->x_private); 92 /* xx should we close the file ?? */ 93 } 94 95 static bool_t 96 xdrstdio_getlong(XDR *xdrs, long int *lp) 97 { 98 u_int32_t temp; 99 100 if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1) 101 return (FALSE); 102 *lp = (long)ntohl(temp); 103 return (TRUE); 104 } 105 106 static bool_t 107 xdrstdio_putlong(XDR *xdrs, long int *lp) 108 { 109 int32_t mycopy = htonl((u_int32_t)*lp); 110 111 if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1) 112 return (FALSE); 113 return (TRUE); 114 } 115 116 static bool_t 117 xdrstdio_getbytes(XDR *xdrs, caddr_t addr, u_int len) 118 { 119 120 if ((len != 0) && (fread(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1)) 121 return (FALSE); 122 return (TRUE); 123 } 124 125 static bool_t 126 xdrstdio_putbytes(XDR *xdrs, caddr_t addr, u_int len) 127 { 128 129 if ((len != 0) && (fwrite(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1)) 130 return (FALSE); 131 return (TRUE); 132 } 133 134 static u_int 135 xdrstdio_getpos(XDR *xdrs) 136 { 137 138 return ((u_int) ftell((FILE *)xdrs->x_private)); 139 } 140 141 static bool_t 142 xdrstdio_setpos(XDR *xdrs, u_int pos) 143 { 144 145 return ((fseek((FILE *)xdrs->x_private, (long)pos, SEEK_SET) < 0) ? 146 FALSE : TRUE); 147 } 148 149 /* ARGSUSED */ 150 static int32_t * 151 xdrstdio_inline(XDR *xdrs, u_int len) 152 { 153 154 /* 155 * Must do some work to implement this: must ensure 156 * enough data in the underlying stdio buffer, 157 * that the buffer is aligned so that we can indirect through a 158 * long *, and stuff this pointer in xdrs->x_buf. Doing 159 * a fread or fwrite to a scratch buffer would defeat 160 * most of the gains to be had here and require storage 161 * management on this buffer, so we don't do this. 162 */ 163 return (NULL); 164 } 165