--- /dev/null
+/* PortableXDR - a free, portable XDR implementation.
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef PORTABLEXDR_XDR_INTERNAL_H
+#define PORTABLEXDR_XDR_INTERNAL_H
+
+#include <rpc/types.h>
+#include <stdarg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __GNUC__
+#ifndef __GNUC_PREREQ
+#define __GNUC_PREREQ(maj,min) 0
+#endif
+#ifndef ATTRIBUTE_UNUSED
+#define ATTRIBUTE_UNUSED __attribute__((__unused__))
+#endif
+#else
+#define ATTRIBUTE_UNUSED
+#endif /* __GNUC__ */
+
+/* Here we get into what could be termed the "internals" of XDR. Most
+ * callers can get away with only ever using the basic XDR types and
+ * functions (see <rpc/xdr.h>. Sometimes, particularly for
+ * compatibility with Sun XDR code, you need to delve into the
+ * internals.
+ */
+
+enum xdr_op {
+ XDR_ENCODE,
+ XDR_DECODE,
+ XDR_FREE
+};
+
+/* Operations available on an XDR data stream (file, socket or memory
+ * area). Callers shouldn't normally use these, but Sun's XDR
+ * implementation exposes these operations, so we do too.
+ */
+struct xdr_ops {
+ /* Get/put "long" (ie. 32 bit quantity). */
+ bool_t (*x_getlong) (XDR *, int32_t *);
+ bool_t (*x_putlong) (XDR *, int32_t *);
+ /* Get/put bytes. */
+ bool_t (*x_getbytes) (XDR *, void *, size_t);
+ bool_t (*x_putbytes) (XDR *, void *, size_t);
+ /* Get or seek within the stream (offsets from beginning of stream). */
+ off_t (*x_getpostn) (XDR *);
+ bool_t (*x_setpostn) (XDR *, off_t);
+ /* Returns a pointer to the next n bytes in the stream. */
+ void * (*x_inline) (XDR *, size_t);
+ /* Free the stream. */
+ void (*x_destroy) (XDR *);
+};
+
+struct xdr {
+ /* Calling code can read the operation field, but should not update it. */
+ enum xdr_op x_op; /* operation (encode/decode/free) */
+
+ /* Calling code may use this pointer for any purpose, eg.
+ * to point to their own data.
+ */
+ void *x_public;
+
+ struct xdr_ops x_ops;
+
+ /* The remaining fields are private and could change in any
+ * future release. Calling code should not use or modify them.
+ */
+ void *x__private;
+};
+
+/* Define wrapper functions around the x_ops. */
+static inline bool_t
+xdr_getlong (XDR *xdrs, int32_t *v)
+{
+ return xdrs->x_ops->x_getlong (xdrs, v);
+}
+static inline bool_t
+xdr_putlong (XDR *xdrs, int32_t *v)
+{
+ return xdrs->x_ops->x_putlong (xdrs, v);
+}
+static inline bool_t
+xdr_getbytes (XDR *xdrs, void *p, size_t len)
+{
+ return xdrs->x_ops->x_getbytes (xdrs, p, len);
+}
+static inline bool_t
+xdr_putbytes (XDR *xdrs, void *p, size_t len)
+{
+ return xdrs->x_ops->x_putbytes (xdrs, p, len);
+}
+static inline off_t
+xdr_getpos (XDR *xdrs)
+{
+ return xdrs->x_ops->x_getpostn (xdrs);
+}
+static inline bool_t
+xdr_setpos (XDR *xdrs, off_t v)
+{
+ return xdrs->x_ops->x_setpostn (xdrs, v);
+}
+static inline void
+xdr_inline (XDR *xdrs, size_t len)
+{
+ return xdrs->x_ops->x_inline (xdrs, len);
+}
+static inline void
+xdr_destroy (XDR *xdrs)
+{
+ return xdrs->x_ops->x_destroy (xdrs);
+}
+
+/* For compatibility with Sun XDR. */
+#define XDR_GETLONG xdr_getlong
+#define XDR_PUTLONG xdr_putlong
+#define XDR_GETBYTES xdr_getbytes
+#define XDR_PUTBYTES xdr_putbytes
+#define XDR_GETPOS xdr_getpos
+#define XDR_SETPOS xdr_setpos
+#define XDR_INLINE xdr_inline
+#define XDR_DESTROY xdr_destroy
+
+/* Also seen in the wild ... */
+#define XDR_GETINT32 xdr_getlong
+#define XDR_PUTINT32 xdr_putlong
+
+/* These are the "inline" versions of the macros. These are used
+ * in SunRPC for some primitive optimizations. For example, suppose
+ * you have to parse 4 integers from the stream. You could
+ * optimize using these macros by doing:
+ *
+ * if (xdr->x_op == XDR_DECODE) {
+ * void *buf = xdr_inline (xdr, 4 * BYTES_PER_XDR_UNIT);
+ * if (buf) {
+ * i0 = IXDR_GET_LONG (buf); // NB. Macro autoincrements buf.
+ * i1 = IXDR_GET_LONG (buf);
+ * i2 = IXDR_GET_LONG (buf);
+ * i3 = IXDR_GET_LONG (buf);
+ * return TRUE;
+ * }
+ * }
+ * else if (xdr->x_op == XDR_ENCODE) {
+ * // Similar code required for encoding.
+ * }
+ * // Fallback code
+ * if (!xdr_int (xdr, &i0)) return FALSE;
+ * if (!xdr_int (xdr, &i1)) return FALSE;
+ * if (!xdr_int (xdr, &i2)) return FALSE;
+ * if (!xdr_int (xdr, &i3)) return FALSE;
+ * return TRUE;
+ *
+ * Note that you have to fallback in the case when xdr_inline
+ * returns NULL. This is NOT an error case.
+ *
+ * Whether this optimization is really worth it or not is left as
+ * an exercise in benchmarking. In any case, PortableXDR's rpcgen
+ * does NOT perform this optimization.
+ */
+
+#define BYTES_PER_XDR_UNIT 4
+
+#define IXDR_GET_LONG(buf) ((int32_t) ntohl (*((int32_t *)(buf))++))
+#define IXDR_GET_BOOL(buf) ((bool_t) IXDR_GET_LONG ((buf)))
+#define IXDR_GET_ENUM(buf,type) ((type) IXDR_GET_LONG ((buf)))
+#define IXDR_GET_U_LONG(buf) ((uint32_t) IXDR_GET_LONG ((buf)))
+#define IXDR_GET_SHORT(buf) ((int16_t) IXDR_GET_LONG ((buf)))
+#define IXDR_GET_U_SHORT(buf) ((uint16_t) IXDR_GET_LONG ((buf)))
+#define IXDR_GET_INT32 IXDR_GET_LONG
+
+#define IXDR_PUT_LONG(buf,v) ((*((int32_t *)(buf))++) = htonl ((v)))
+#define IXDR_PUT_BOOL(buf,v) IXDR_PUT_LONG((buf), (int32_t) (v))
+#define IXDR_PUT_ENUM(buf,v) IXDR_PUT_LONG((buf), (int32_t) (v))
+#define IXDR_PUT_U_LONG(buf,v) IXDR_PUT_LONG((buf), (int32_t) (v))
+#define IXDR_PUT_SHORT(buf,v) IXDR_PUT_LONG((buf), (int32_t) (v))
+#define IXDR_PUT_U_SHORT(buf,v) IXDR_PUT_LONG((buf), (int32_t) (v))
+#define IXDR_PUT_INT32 IXDR_PUT_LONG
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PORTABLEXDR_XDR_INTERNAL_H */
git.annexia.org / portablexdr.git / blobdiff