1 /* $OpenBSD: xdr_stdio.c,v 1.12 2008/12/09 19:40:10 otto 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 <stdio.h> 42 #include <rpc/types.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 NULL, /* xdrstdio_control */ 67 }; 68 69 /* 70 * Initialize a stdio xdr stream. 71 * Sets the xdr stream handle xdrs for use on the stream file. 72 * Operation flag is set to op. 73 */ 74 void 75 xdrstdio_create(XDR *xdrs, FILE *file, enum xdr_op op) 76 { 77 78 xdrs->x_op = op; 79 xdrs->x_ops = &xdrstdio_ops; 80 xdrs->x_private = (caddr_t)file; 81 xdrs->x_handy = 0; 82 xdrs->x_base = 0; 83 } 84 85 /* 86 * Destroy a stdio xdr stream. 87 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create. 88 */ 89 static void 90 xdrstdio_destroy(XDR *xdrs) 91 { 92 (void)fflush((FILE *)xdrs->x_private); 93 /* xx should we close the file ?? */ 94 } 95 96 static bool_t 97 xdrstdio_getlong(XDR *xdrs, long int *lp) 98 { 99 u_int32_t temp; 100 101 if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1) 102 return (FALSE); 103 *lp = (long)ntohl(temp); 104 return (TRUE); 105 } 106 107 static bool_t 108 xdrstdio_putlong(XDR *xdrs, long int *lp) 109 { 110 int32_t mycopy = htonl((u_int32_t)*lp); 111 112 if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1) 113 return (FALSE); 114 return (TRUE); 115 } 116 117 static bool_t 118 xdrstdio_getbytes(XDR *xdrs, caddr_t addr, u_int len) 119 { 120 121 if ((len != 0) && (fread(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1)) 122 return (FALSE); 123 return (TRUE); 124 } 125 126 static bool_t 127 xdrstdio_putbytes(XDR *xdrs, caddr_t addr, u_int len) 128 { 129 130 if ((len != 0) && (fwrite(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1)) 131 return (FALSE); 132 return (TRUE); 133 } 134 135 static u_int 136 xdrstdio_getpos(XDR *xdrs) 137 { 138 139 return ((u_int) ftell((FILE *)xdrs->x_private)); 140 } 141 142 static bool_t 143 xdrstdio_setpos(XDR *xdrs, u_int pos) 144 { 145 146 return ((fseek((FILE *)xdrs->x_private, (long)pos, SEEK_SET) < 0) ? 147 FALSE : TRUE); 148 } 149 150 /* ARGSUSED */ 151 static int32_t * 152 xdrstdio_inline(XDR *xdrs, u_int len) 153 { 154 155 /* 156 * Must do some work to implement this: must ensure 157 * enough data in the underlying stdio buffer, 158 * that the buffer is aligned so that we can indirect through a 159 * long *, and stuff this pointer in xdrs->x_buf. Doing 160 * a fread or fwrite to a scratch buffer would defeat 161 * most of the gains to be had here and require storage 162 * management on this buffer, so we don't do this. 163 */ 164 return (NULL); 165 } 166