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# xdr.cpp

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    00001
    00002 /*********************************************************************
    00003  * RPC for the Windows NT Operating System
    00004  * 1993 by Martin F. Gergeleit
    00005  * Users may use, copy or modify Sun RPC for the Windows NT Operating
    00006  * System according to the Sun copyright below.
    00007  *
    00008  * RPC for the Windows NT Operating System COMES WITH ABSOLUTELY NO
    00009  * WARRANTY, NOR WILL I BE LIABLE FOR ANY DAMAGES INCURRED FROM THE
    00010  * USE OF. USE ENTIRELY AT YOUR OWN RISK!!!
    00011  *********************************************************************/
    00012
    00013 /* @(#)xdr.c    2.1 88/07/29 4.0 RPCSRC */
    00014 /*
    00015  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
    00016  * unrestricted use provided that this legend is included on all tape
    00017  * media and as a part of the software program in whole or part.  Users
    00018  * may copy or modify Sun RPC without charge, but are not authorized
    00019  * to license or distribute it to anyone else except as part of a product or
    00020  * program developed by the user.
    00021  *
    00022  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
    00023  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
    00024  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
    00025  *
    00026  * Sun RPC is provided with no support and without any obligation on the
    00027  * part of Sun Microsystems, Inc. to assist in its use, correction,
    00028  * modification or enhancement.
    00029  *
    00030  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
    00031  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
    00032  * OR ANY PART THEREOF.
    00033  *
    00034  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
    00035  * or profits or other special, indirect and consequential damages, even if
    00036  * Sun has been advised of the possibility of such damages.
    00037  *
    00038  * Sun Microsystems, Inc.
    00039  * 2550 Garcia Avenue
    00040  * Mountain View, California  94043
    00041  */
    00042
    00044 #ifdef WIN32
    00045
    00046 #if !defined(lint) && defined(SCCSIDS)
    00047 static char sccsid[] = "@(#)xdr.c 1.35 87/08/12";
    00048 #endif
    00049
    00050 /*
    00051  * xdr.c, Generic XDR routines implementation.
    00052  *
    00053  * Copyright (C) 1986, Sun Microsystems, Inc.
    00054  *
    00055  * These are the "generic" xdr routines used to serialize and de-serialize
    00056  * most common data items.  See xdr.h for more info on the interface to
    00057  * xdr.
    00058  */
    00059
    00060 #include <stdio.h>
    00061 #include <stdlib.h>             /* malloc,free */
    00062 #include <string.h>             /* strlen() */
    00063
    00064 #include <Winsock2.h>
    00065 #include "xdr.h"
    00066
    00067 /*
    00068  * constants specific to the xdr "protocol"
    00069  */
    00070 #define XDR_FALSE       ((long) 0)
    00071 #define XDR_TRUE        ((long) 1)
    00072 #define LASTUNSIGNED    ((u_int) 0-1)
    00073
    00074 /*
    00075  * for unit alignment
    00076  */
    00077 static char xdr_zero[BYTES_PER_XDR_UNIT] = { 0, 0, 0, 0 };
    00078
    00079 /*
    00080  * Free a data structure using XDR
    00081  * Not a filter, but a convenient utility nonetheless
    00082  */
    00083 void
    00084 xdr_free(xdrproc_t proc, char *objp)
    00085 {
    00086         XDR x;
    00087
    00088         x.x_op = XDR_FREE;
    00089         (*proc)(&x, objp);
    00090 }
    00091
    00092 /*
    00093  * XDR nothing
    00094  */
    00095 bool_t
    00096 xdr_void(/* xdrs, addr */)
    00097         /* XDR *xdrs; */
    00098         /* caddr_t addr; */
    00099 {
    00100
    00101         return (TRUE);
    00102 }
    00103
    00104 /*
    00105  * XDR integers
    00106  */
    00107 bool_t
    00108 xdr_int(XDR *xdrs, int *ip)
    00109 {
    00110
    00111 #ifdef lint
    00112         (void) (xdr_short(xdrs, (short *)ip));
    00113         return (xdr_long(xdrs, (long *)ip));
    00114 #else
    00115         if (sizeof (int) == sizeof (long)) {
    00116                 return (xdr_long(xdrs, (long *)ip));
    00117         } else {
    00118                 return (xdr_short(xdrs, (short *)ip));
    00119         }
    00120 #endif
    00121 }
    00122
    00123 /*
    00124  * XDR long integers
    00125  * same as xdr_u_long - open coded to save a proc call!
    00126  */
    00127 bool_t
    00128 xdr_long(register XDR *xdrs, long *lp)
    00129 {
    00130
    00131         if (xdrs->x_op == XDR_ENCODE)
    00132                 return (XDR_PUTLONG(xdrs, lp));
    00133
    00134         if (xdrs->x_op == XDR_DECODE)
    00135                 return (XDR_GETLONG(xdrs, lp));
    00136
    00137         if (xdrs->x_op == XDR_FREE)
    00138                 return (TRUE);
    00139
    00140         return (FALSE);
    00141 }
    00142
    00143 /*
    00144  * XDR unsigned long integers
    00145  * same as xdr_long - open coded to save a proc call!
    00146  */
    00147 bool_t
    00148 xdr_u_long(register XDR *xdrs, u_long *ulp)
    00149 {
    00150
    00151         if (xdrs->x_op == XDR_DECODE)
    00152                 return (XDR_GETLONG(xdrs, (long *)ulp));
    00153         if (xdrs->x_op == XDR_ENCODE)
    00154                 return (XDR_PUTLONG(xdrs, (long *)ulp));
    00155         if (xdrs->x_op == XDR_FREE)
    00156                 return (TRUE);
    00157         return (FALSE);
    00158 }
    00159
    00160 /*
    00161  * XDR short integers
    00162  */
    00163 bool_t
    00164 xdr_short(register XDR *xdrs, short *sp)
    00165 {
    00166         long l;
    00167
    00168         switch (xdrs->x_op) {
    00169
    00170         case XDR_ENCODE:
    00171                 l = (long) *sp;
    00172                 return (XDR_PUTLONG(xdrs, &l));
    00173
    00174         case XDR_DECODE:
    00175                 if (!XDR_GETLONG(xdrs, &l)) {
    00176                         return (FALSE);
    00177                 }
    00178                 *sp = (short) l;
    00179                 return (TRUE);
    00180
    00181         case XDR_FREE:
    00182                 return (TRUE);
    00183         }
    00184         return (FALSE);
    00185 }
    00186
    00187 /*
    00188  * XDR unsigned short integers
    00189  */
    00190 bool_t
    00191 xdr_u_short(register XDR *xdrs, u_short *usp)
    00192 {
    00193         long l;
    00194
    00195         switch (xdrs->x_op) {
    00196
    00197         case XDR_ENCODE:
    00198                 l = (long) *usp;
    00199                 return (XDR_PUTLONG(xdrs, &l));
    00200
    00201         case XDR_DECODE:
    00202                 if (!XDR_GETLONG(xdrs, &l)) {
    00203                         return (FALSE);
    00204                 }
    00205                 *usp = (u_short) l;
    00206                 return (TRUE);
    00207
    00208         case XDR_FREE:
    00209                 return (TRUE);
    00210         }
    00211         return (FALSE);
    00212 }
    00213
    00214 /*
    00215  * XDR unsigned integers
    00216  */
    00217 bool_t
    00218 xdr_u_int(XDR *xdrs, u_int *up)
    00219 {
    00220
    00221 #ifdef lint
    00222         (void) (xdr_short(xdrs, (short *)up));
    00223         return (xdr_u_long(xdrs, (u_long *)up));
    00224 #else
    00225         if (sizeof (u_int) == sizeof (u_long)) {
    00226                 return (xdr_u_long(xdrs, (u_long *)up));
    00227         } else {
    00228                 return (xdr_short(xdrs, (short *)up));
    00229         }
    00230 #endif
    00231 }
    00232
    00233 /*
    00234  * XDR opaque data
    00235  * Allows the specification of a fixed size sequence of opaque bytes.
    00236  * cp points to the opaque object and cnt gives the byte length.
    00237  */
    00238 bool_t
    00239 xdr_opaque(register XDR *xdrs, caddr_t cp, register u_int cnt)
    00240 {
    00241         register u_int rndup;
    00242         static crud[BYTES_PER_XDR_UNIT];
    00243
    00244         /*
    00245          * if no data we are done
    00246          */
    00247         if (cnt == 0)
    00248                 return (TRUE);
    00249
    00250         /*
    00251          * round byte count to full xdr units
    00252          */
    00253         rndup = cnt % BYTES_PER_XDR_UNIT;
    00254         if (rndup > 0)
    00255                 rndup = BYTES_PER_XDR_UNIT - rndup;
    00256
    00257         if (xdrs->x_op == XDR_DECODE) {
    00258                 if (!XDR_GETBYTES(xdrs, cp, cnt)) {
    00259                         return (FALSE);
    00260                 }
    00261                 if (rndup == 0)
    00262                         return (TRUE);
    00263                 return (XDR_GETBYTES(xdrs, crud, rndup));
    00264         }
    00265
    00266         if (xdrs->x_op == XDR_ENCODE) {
    00267                 if (!XDR_PUTBYTES(xdrs, cp, cnt)) {
    00268                         return (FALSE);
    00269                 }
    00270                 if (rndup == 0)
    00271                         return (TRUE);
    00272                 return (XDR_PUTBYTES(xdrs, xdr_zero, rndup));
    00273         }
    00274
    00275         if (xdrs->x_op == XDR_FREE) {
    00276                 return (TRUE);
    00277         }
    00278
    00279         return (FALSE);
    00280 }
    00281
    00282 /*
    00283  * XDR null terminated ASCII strings
    00284  * xdr_string deals with "C strings" - arrays of bytes that are
    00285  * terminated by a NULL character.  The parameter cpp references a
    00286  * pointer to storage; If the pointer is null, then the necessary
    00287  * storage is allocated.  The last parameter is the max allowed length
    00288  * of the string as specified by a protocol.
    00289  */
    00290 bool_t
    00291 xdr_string(register XDR *xdrs, char **cpp, u_int maxsize)
    00292 {
    00293         register char *sp = *cpp;  /* sp is the actual string pointer */
    00294         u_int size;
    00295         u_int nodesize;
    00296
    00297         /*
    00298          * first deal with the length since xdr strings are counted-strings
    00299          */
    00300         switch (xdrs->x_op) {
    00301         case XDR_FREE:
    00302                 if (sp == NULL) {
    00303                         return(TRUE);   /* already free */
    00304                 }
    00305                 /* fall through... */
    00306         case XDR_ENCODE:
    00307                 size = strlen(sp);
    00308                 break;
    00309         }
    00310         if (! xdr_u_int(xdrs, &size)) {
    00311                 return (FALSE);
    00312         }
    00313         if (size > maxsize) {
    00314                 return (FALSE);
    00315         }
    00316         nodesize = size + 1;
    00317
    00318         /*
    00319          * now deal with the actual bytes
    00320          */
    00321         switch (xdrs->x_op) {
    00322
    00323         case XDR_DECODE:
    00324                 if (nodesize == 0) {
    00325                         return (TRUE);
    00326                 }
    00327                 if (sp == NULL)
    00328                         *cpp = sp = (char *)mem_alloc(nodesize);
    00329                 if (sp == NULL) {
    00330                         (void) fprintf(stderr, "xdr_string: out of memory\n");
    00331                         return (FALSE);
    00332                 }
    00333                 sp[size] = 0;
    00334                 /* fall into ... */
    00335
    00336         case XDR_ENCODE:
    00337                 return (xdr_opaque(xdrs, sp, size));
    00338
    00339         case XDR_FREE:
    00340                 mem_free(sp, nodesize);
    00341                 *cpp = NULL;
    00342                 return (TRUE);
    00343         }
    00344         return (FALSE);
    00345 }
    00346
    00347 bool_t
    00348 xdr_float(register XDR *xdrs, register float *fp)
    00349 {
    00350         switch (xdrs->x_op) {
    00351         case XDR_ENCODE:
    00352                 return (XDR_PUTLONG(xdrs, (long *)fp));
    00353         case XDR_DECODE:
    00354                 return (XDR_GETLONG(xdrs, (long *)fp));
    00355         case XDR_FREE:
    00356                 return (TRUE);
    00357         }
    00358         return (FALSE);
    00359 }
    00360
    00361 bool_t
    00362 xdr_double(register XDR *xdrs, double *dp)
    00363 {
    00364         register long *lp;
    00365
    00366         switch (xdrs->x_op) {
    00367         case XDR_ENCODE:
    00368                 lp = (long *)dp;
    00369                 return (XDR_PUTLONG(xdrs, lp+1) && XDR_PUTLONG(xdrs, lp));
    00370         case XDR_DECODE:
    00371                 lp = (long *)dp;
    00372                 return (XDR_GETLONG(xdrs, lp+1) && XDR_GETLONG(xdrs, lp));
    00373         case XDR_FREE:
    00374                 return (TRUE);
    00375         }
    00376         return (FALSE);
    00377 }
    00378
    00379
    00380 /************************* XDR operations with memory buffers **************************/
    00381
    00382 void xdrmem_destroy(void *);
    00383 bool_t xdrmem_getlong(void *xdrs, long *lp);
    00384 bool_t xdrmem_putlong(void *xdrs, long *lp);
    00385 bool_t xdrmem_getbytes(void *xdrs, void *addr, register int len);
    00386 bool_t xdrmem_putbytes(void *xdrs, void *addr, register int len);
    00387 u_int  xdrmem_getpos(void *xdrs);
    00388 bool_t xdrmem_setpos(void *xdrs, int pos);
    00389 long * xdrmem_inline(void *xdrs, int len);
    00390
    00391 static XDR::xdr_ops xdrmem_ops = {
    00392         &xdrmem_getlong,
    00393         &xdrmem_putlong,
    00394         &xdrmem_getbytes,
    00395         &xdrmem_putbytes,
    00396         &xdrmem_getpos,
    00397         &xdrmem_setpos,
    00398         &xdrmem_inline,
    00399         &xdrmem_destroy
    00400 };
    00401
    00402 /*
    00403  * The procedure xdrmem_create initializes a stream descriptor for a
    00404  * memory buffer.
    00405  */
    00406 void
    00407 xdrmem_create(register XDR *xdrs, caddr_t addr, u_int size, enum xdr_op op)
    00408 {
    00409
    00410         xdrs->x_op = op;
    00411         xdrs->x_ops = &xdrmem_ops;
    00412         xdrs->x_private = xdrs->x_base = addr;
    00413         xdrs->x_handy = size;
    00414 }
    00415
    00416 static void
    00417 xdrmem_destroy(void *xdrs)
    00418 {
    00419 }
    00420
    00421 static bool_t
    00422 xdrmem_getlong(void *xdrsv, long *lp)
    00423 {
    00424                 register XDR *xdrs = (XDR *)xdrsv;
    00425         if ((xdrs->x_handy -= sizeof(long)) < 0)
    00426                 return (FALSE);
    00427         *lp = (long)ntohl((u_long)(*((long *)(xdrs->x_private))));
    00428         xdrs->x_private += sizeof(long);
    00429         return (TRUE);
    00430 }
    00431
    00432 static bool_t
    00433 xdrmem_putlong(void *xdrsv, long *lp)
    00434 {
    00435
    00436                 register XDR *xdrs = (XDR *)xdrsv;
    00437         if ((xdrs->x_handy -= sizeof(long)) < 0)
    00438                 return (FALSE);
    00439         *(long *)xdrs->x_private = (long)htonl((u_long)(*lp));
    00440         xdrs->x_private += sizeof(long);
    00441         return (TRUE);
    00442 }
    00443
    00444 static bool_t
    00445 xdrmem_getbytes(void *xdrsv, void *addr, register int len)
    00446 {
    00447                 register XDR *xdrs = (XDR *)xdrsv;
    00448         if ((xdrs->x_handy -= len) < 0)
    00449                 return (FALSE);
    00450         memcpy(addr, xdrs->x_private, len);
    00451         xdrs->x_private += len;
    00452         return (TRUE);
    00453 }
    00454
    00455 static bool_t
    00456 xdrmem_putbytes(void *xdrsv, void *addr, register int len)
    00457 {
    00458                 register XDR *xdrs = (XDR *)xdrsv;
    00459         if ((xdrs->x_handy -= len) < 0)
    00460                 return (FALSE);
    00461         memcpy(xdrs->x_private, addr, len);
    00462         xdrs->x_private += len;
    00463         return (TRUE);
    00464 }
    00465
    00466 static u_int
    00467 xdrmem_getpos(void *xdrsv)
    00468 {
    00469                 register XDR *xdrs = (XDR *)xdrsv;
    00470         return ((u_int)xdrs->x_private - (u_int)xdrs->x_base);
    00471 }
    00472
    00473 static bool_t
    00474 xdrmem_setpos(void *xdrsv, int pos)
    00475 {
    00476                 register XDR *xdrs = (XDR *)xdrsv;
    00477         register caddr_t newaddr = xdrs->x_base + pos;
    00478         register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
    00479
    00480         if ((long)newaddr > (long)lastaddr)
    00481                 return (FALSE);
    00482         xdrs->x_private = newaddr;
    00483         xdrs->x_handy = (int)lastaddr - (int)newaddr;
    00484         return (TRUE);
    00485 }
    00486
    00487 static long *
    00488 xdrmem_inline(void *xdrsv, int len)
    00489 {
    00490         long *buf = 0;
    00491                 register XDR *xdrs = (XDR *)xdrsv;
    00492         if (xdrs->x_handy >= len) {
    00493                 xdrs->x_handy -= len;
    00494                 buf = (long *) xdrs->x_private;
    00495                 xdrs->x_private += len;
    00496         }
    00497         return (buf);
    00498 }
    00499
    00500 #endif  /* WIN32 */