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29 #include <afsconfig.h>
30 #include <afs/param.h>
37 * xdr_stdio.c, XDR implementation on standard i/o file.
39 * Copyright (C) 1984, Sun Microsystems, Inc.
41 * This set of routines implements a XDR on a stdio stream.
42 * XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
49 static bool_t xdrstdio_getint32();
50 static bool_t xdrstdio_putint32();
51 static bool_t xdrstdio_getbytes();
52 static bool_t xdrstdio_putbytes();
53 static u_int xdrstdio_getpos();
54 static bool_t xdrstdio_setpos();
55 static afs_int32 * xdrstdio_inline();
56 static void xdrstdio_destroy();
59 * Ops vector for stdio type XDR
61 static struct xdr_ops xdrstdio_ops = {
62 xdrstdio_getint32, /* deserialize an afs_int32 */
63 xdrstdio_putint32, /* serialize an afs_int32 */
64 xdrstdio_getbytes, /* deserialize counted bytes */
65 xdrstdio_putbytes, /* serialize counted bytes */
66 xdrstdio_getpos, /* get offset in the stream */
67 xdrstdio_setpos, /* set offset in the stream */
68 xdrstdio_inline, /* prime stream for inline macros */
69 xdrstdio_destroy /* destroy stream */
73 * Initialize a stdio xdr stream.
74 * Sets the xdr stream handle xdrs for use on the stream file.
75 * Operation flag is set to op.
78 xdrstdio_create(xdrs, file, op)
85 xdrs->x_ops = &xdrstdio_ops;
86 xdrs->x_private = (caddr_t)file;
92 * Destroy a stdio xdr stream.
93 * Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
96 xdrstdio_destroy(xdrs)
99 (void)fflush((FILE *)xdrs->x_private);
100 /* xx should we close the file ?? */
104 xdrstdio_getint32(xdrs, lp)
106 register afs_int32 *lp;
109 if (fread((caddr_t)lp, sizeof(afs_int32), 1, (FILE *)xdrs->x_private) != 1)
118 xdrstdio_putint32(xdrs, lp)
124 afs_int32 mycopy = htonl(*lp);
127 if (fwrite((caddr_t)lp, sizeof(afs_int32), 1, (FILE *)xdrs->x_private) != 1)
133 xdrstdio_getbytes(xdrs, addr, len)
139 if ((len != 0) && (fread(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
145 xdrstdio_putbytes(xdrs, addr, len)
151 if ((len != 0) && (fwrite(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
157 xdrstdio_getpos(xdrs)
161 return ((u_int) ftell((FILE *)xdrs->x_private));
165 xdrstdio_setpos(xdrs, pos)
170 return ((fseek((FILE *)xdrs->x_private, (afs_int32)pos, 0) < 0) ?
175 xdrstdio_inline(xdrs, len)
181 * Must do some work to implement this: must insure
182 * enough data in the underlying stdio buffer,
183 * that the buffer is aligned so that we can indirect through a
184 * afs_int32 *, and stuff this pointer in xdrs->x_buf. Doing
185 * a fread or fwrite to a scratch buffer would defeat
186 * most of the gains to be had here and require storage
187 * management on this buffer, so we don't do this.