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29 #include <afsconfig.h>
30 #include <afs/param.h>
38 * xdr_stdio.c, XDR implementation on standard i/o file.
40 * Copyright (C) 1984, Sun Microsystems, Inc.
42 * This set of routines implements a XDR on a stdio stream.
43 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
50 static bool_t xdrstdio_getint32();
51 static bool_t xdrstdio_putint32();
52 static bool_t xdrstdio_getbytes();
53 static bool_t xdrstdio_putbytes();
54 static u_int xdrstdio_getpos();
55 static bool_t xdrstdio_setpos();
56 static afs_int32 *xdrstdio_inline();
57 static void xdrstdio_destroy();
60 * Ops vector for stdio type XDR
62 static struct xdr_ops xdrstdio_ops = {
63 xdrstdio_getint32, /* deserialize an afs_int32 */
64 xdrstdio_putint32, /* serialize an afs_int32 */
65 xdrstdio_getbytes, /* deserialize counted bytes */
66 xdrstdio_putbytes, /* serialize counted bytes */
67 xdrstdio_getpos, /* get offset in the stream */
68 xdrstdio_setpos, /* set offset in the stream */
69 xdrstdio_inline, /* prime stream for inline macros */
70 xdrstdio_destroy /* destroy stream */
74 * Initialize a stdio xdr stream.
75 * Sets the xdr stream handle xdrs for use on the stream file.
76 * Operation flag is set to op.
79 xdrstdio_create(xdrs, file, op)
86 xdrs->x_ops = &xdrstdio_ops;
87 xdrs->x_private = (caddr_t) file;
93 * Destroy a stdio xdr stream.
94 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
97 xdrstdio_destroy(xdrs)
100 (void)fflush((FILE *) xdrs->x_private);
101 /* xx should we close the file ?? */
105 xdrstdio_getint32(xdrs, lp)
107 register afs_int32 *lp;
110 if (fread((caddr_t) lp, sizeof(afs_int32), 1, (FILE *) xdrs->x_private) !=
120 xdrstdio_putint32(xdrs, lp)
126 afs_int32 mycopy = htonl(*lp);
129 if (fwrite((caddr_t) lp, sizeof(afs_int32), 1, (FILE *) xdrs->x_private)
136 xdrstdio_getbytes(xdrs, addr, len)
143 && (fread(addr, (int)len, 1, (FILE *) xdrs->x_private) != 1))
149 xdrstdio_putbytes(xdrs, addr, len)
156 && (fwrite(addr, (int)len, 1, (FILE *) xdrs->x_private) != 1))
162 xdrstdio_getpos(xdrs)
166 return ((u_int) ftell((FILE *) xdrs->x_private));
170 xdrstdio_setpos(xdrs, pos)
175 return ((fseek((FILE *) xdrs->x_private, (afs_int32) pos, 0) <
180 xdrstdio_inline(xdrs, len)
186 * Must do some work to implement this: must insure
187 * enough data in the underlying stdio buffer,
188 * that the buffer is aligned so that we can indirect through a
189 * afs_int32 *, and stuff this pointer in xdrs->x_buf. Doing
190 * a fread or fwrite to a scratch buffer would defeat
191 * most of the gains to be had here and require storage
192 * management on this buffer, so we don't do this.