241 lines
6.6 KiB
C
241 lines
6.6 KiB
C
/*
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* xdr_mem.c, XDR implementation using memory buffers.
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*
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* Copyright (c) 2010, Oracle America, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the "Oracle America, Inc." nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* If you have some data to be interpreted as external data representation
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* or to be converted to external data representation in a memory buffer,
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* then this is the package for you.
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*/
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#include <string.h>
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#include <limits.h>
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#include <rpc/rpc.h>
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static bool_t xdrmem_getlong (XDR *, long *);
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static bool_t xdrmem_putlong (XDR *, const long *);
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static bool_t xdrmem_getbytes (XDR *, caddr_t, u_int);
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static bool_t xdrmem_putbytes (XDR *, const char *, u_int);
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static u_int xdrmem_getpos (const XDR *);
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static bool_t xdrmem_setpos (XDR *, u_int);
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static int32_t *xdrmem_inline (XDR *, u_int);
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static void xdrmem_destroy (XDR *);
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static bool_t xdrmem_getint32 (XDR *, int32_t *);
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static bool_t xdrmem_putint32 (XDR *, const int32_t *);
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static const struct xdr_ops xdrmem_ops =
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{
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xdrmem_getlong,
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xdrmem_putlong,
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xdrmem_getbytes,
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xdrmem_putbytes,
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xdrmem_getpos,
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xdrmem_setpos,
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xdrmem_inline,
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xdrmem_destroy,
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xdrmem_getint32,
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xdrmem_putint32
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};
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/*
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* The procedure xdrmem_create initializes a stream descriptor for a
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* memory buffer.
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*/
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void
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xdrmem_create (XDR *xdrs, const caddr_t addr, u_int size, enum xdr_op op)
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{
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xdrs->x_op = op;
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/* We have to add the const since the `struct xdr_ops' in `struct XDR'
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is not `const'. */
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xdrs->x_ops = (struct xdr_ops *) &xdrmem_ops;
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xdrs->x_private = xdrs->x_base = addr;
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xdrs->x_handy = size;
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}
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#ifdef EXPORT_RPC_SYMBOLS
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libc_hidden_def (xdrmem_create)
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#else
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libc_hidden_nolink_sunrpc (xdrmem_create, GLIBC_2_0)
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#endif
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/*
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* Nothing needs to be done for the memory case. The argument is clearly
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* const.
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*/
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static void
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xdrmem_destroy (XDR *xdrs)
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{
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}
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/*
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* Gets the next word from the memory referenced by xdrs and places it
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* in the long pointed to by lp. It then increments the private word to
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* point at the next element. Neither object pointed to is const
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*/
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static bool_t
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xdrmem_getlong (XDR *xdrs, long *lp)
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{
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if (xdrs->x_handy < 4)
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return FALSE;
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xdrs->x_handy -= 4;
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*lp = (int32_t) ntohl ((*((int32_t *) (xdrs->x_private))));
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xdrs->x_private += 4;
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return TRUE;
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}
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/*
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* Puts the long pointed to by lp in the memory referenced by xdrs. It
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* then increments the private word to point at the next element. The
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* long pointed at is const
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*/
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static bool_t
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xdrmem_putlong (XDR *xdrs, const long *lp)
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{
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if (xdrs->x_handy < 4)
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return FALSE;
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xdrs->x_handy -= 4;
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*(int32_t *) xdrs->x_private = htonl (*lp);
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xdrs->x_private += 4;
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return TRUE;
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}
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/*
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* Gets an unaligned number of bytes from the xdrs structure and writes them
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* to the address passed in addr. Be very careful when calling this routine
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* as it could leave the xdrs pointing to an unaligned structure which is not
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* a good idea. None of the things pointed to are const.
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*/
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static bool_t
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xdrmem_getbytes (XDR *xdrs, caddr_t addr, u_int len)
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{
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if (xdrs->x_handy < len)
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return FALSE;
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xdrs->x_handy -= len;
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memcpy (addr, xdrs->x_private, len);
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xdrs->x_private += len;
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return TRUE;
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}
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/*
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* The complementary function to the above. The same warnings apply about
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* unaligned data. The source address is const.
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*/
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static bool_t
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xdrmem_putbytes (XDR *xdrs, const char *addr, u_int len)
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{
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if (xdrs->x_handy < len)
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return FALSE;
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xdrs->x_handy -= len;
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memcpy (xdrs->x_private, addr, len);
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xdrs->x_private += len;
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return TRUE;
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}
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/*
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* Not sure what this one does. But it clearly doesn't modify the contents
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* of xdrs. **FIXME** does this not assume u_int == u_long?
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*/
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static u_int
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xdrmem_getpos (const XDR *xdrs)
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{
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return (u_long) xdrs->x_private - (u_long) xdrs->x_base;
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}
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/*
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* xdrs modified
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*/
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static bool_t
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xdrmem_setpos (xdrs, pos)
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XDR *xdrs;
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u_int pos;
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{
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caddr_t newaddr = xdrs->x_base + pos;
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caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
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size_t handy = lastaddr - newaddr;
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if (newaddr > lastaddr
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|| newaddr < xdrs->x_base
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|| handy != (u_int) handy)
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return FALSE;
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xdrs->x_private = newaddr;
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xdrs->x_handy = (u_int) handy;
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return TRUE;
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}
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/*
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* xdrs modified
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*/
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static int32_t *
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xdrmem_inline (XDR *xdrs, u_int len)
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{
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int32_t *buf = 0;
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if (xdrs->x_handy >= len)
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{
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xdrs->x_handy -= len;
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buf = (int32_t *) xdrs->x_private;
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xdrs->x_private += len;
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}
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return buf;
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}
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/*
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* Gets the next word from the memory referenced by xdrs and places it
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* in the int pointed to by ip. It then increments the private word to
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* point at the next element. Neither object pointed to is const
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*/
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static bool_t
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xdrmem_getint32 (XDR *xdrs, int32_t *ip)
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{
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if (xdrs->x_handy < 4)
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return FALSE;
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xdrs->x_handy -= 4;
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*ip = ntohl ((*((int32_t *) (xdrs->x_private))));
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xdrs->x_private += 4;
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return TRUE;
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}
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/*
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* Puts the long pointed to by lp in the memory referenced by xdrs. It
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* then increments the private word to point at the next element. The
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* long pointed at is const
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*/
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static bool_t
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xdrmem_putint32 (XDR *xdrs, const int32_t *ip)
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{
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if (xdrs->x_handy < 4)
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return FALSE;
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xdrs->x_handy -= 4;
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*(int32_t *) xdrs->x_private = htonl (*ip);
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xdrs->x_private += 4;
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return TRUE;
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}
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