src/rx/xdr.h

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  */
  29
  30 /* This file has the contents of Sun's orginal types.h file added. */
  31
  32 /*      @(#)types.h 1.1 86/02/03 SMI      */
  33
  34 /*
  35  * Rpc additions to <sys/types.h>
  36  */
  37
  38 #ifndef __XDR_INCLUDE__
  39 #define __XDR_INCLUDE__
  40 #include <afs/param.h>
  41 #ifdef AFS_NT40_ENV
  42 #ifndef _MFC_VER
  43 #include <winsock2.h>
  44 #endif /* _MFC_VER */
  45 #endif
  46 #ifndef bool_t
  47 #define bool_t  int
  48 #define enum_t  int
  49 #endif
  50 #ifndef FALSE
  51 #define FALSE   0
  52 #endif /* !FALSE */
  53 #ifndef TRUE
  54 #define TRUE    1
  55 #endif /* !TRUE */
  56 #define __dontcare__    -1
  57
  58 #if defined(AFS_NBSD50_ENV)
  59 # if !defined(DEF_CADDR_T)
  60 typedef char * caddr_t;
  61 #define DEF_CADDR_T
  62 # endif
  63 #endif
  64
  65 #ifndef mem_alloc
  66 #define mem_alloc(bsize)        malloc(bsize)
  67 #endif
  68
  69 #ifndef mem_free
  70 #define mem_free(ptr, bsize)    free(ptr)
  71 #endif
  72
  73 #if !defined(AFS_NT40_ENV)
  74 #define xdr_alloc afs_xdr_alloc
  75 #define xdr_free afs_xdr_free
  76 #define xdr_void afs_xdr_void
  77 #define xdr_int afs_xdr_int
  78 #define xdr_u_int afs_xdr_u_int
  79 #define xdr_short afs_xdr_short
  80 #define xdr_u_short afs_xdr_u_short
  81 #define xdr_long afs_xdr_long
  82 #define xdr_u_long afs_xdr_u_long
  83 #define xdr_char afs_xdr_char
  84 #define xdr_u_char afs_xdr_u_char
  85 #define xdr_bool afs_xdr_bool
  86 #define xdr_enum afs_xdr_enum
  87 #define xdr_array afs_xdr_array
  88 #define xdr_arrayN afs_xdr_arrayN
  89 #define xdr_bytes afs_xdr_bytes
  90 #define xdr_opaque afs_xdr_opaque
  91 #define xdr_string afs_xdr_string
  92 #define xdr_union afs_xdr_union
  93 #define xdr_float afs_xdr_float
  94 #define xdr_double afs_xdr_double
  95 #define xdr_reference afs_xdr_reference
  96 #define xdr_wrapstring afs_xdr_wrapstring
  97 #define xdr_vector afs_xdr_vector
  98 #define xdr_int64 afs_xdr_int64
  99 #define xdr_uint64 afs_xdr_uint64
 100 #define xdr_pointer afs_xdr_pointer
 101 #define xdrmem_create afs_xdrmem_create
 102 #endif
 103
 104 #ifdef  KERNEL
 105 #define osi_alloc               afs_osi_Alloc
 106 #define osi_free                afs_osi_Free
 107
 108 /* keep here for now, 64 bit issues */
 109 #ifndef AFS_OBSD44_ENV
 110 extern void *afs_osi_Alloc(size_t x);
 111 extern void afs_osi_Free(void *x, size_t asize);
 112 #endif
 113
 114 #endif
 115 #ifndef major                   /* ouch! */
 116 #include <sys/types.h>
 117 #endif
 118
 119 /*      @(#)xdr.h 1.1 86/02/03 SMI      */
 120
 121 /*
 122  * xdr.h, External Data Representation Serialization Routines.
 123  *
 124  * Copyright (C) 1984, Sun Microsystems, Inc.
 125  */
 126
 127 /*
 128  * XDR provides a conventional way for converting between C data
 129  * types and an external bit-string representation.  Library supplied
 130  * routines provide for the conversion on built-in C data types.  These
 131  * routines and utility routines defined here are used to help implement
 132  * a type encode/decode routine for each user-defined type.
 133  *
 134  * Each data type provides a single procedure which takes two arguments:
 135  *
 136  *      bool_t
 137  *      xdrproc(xdrs, argresp)
 138  *              XDR *xdrs;
 139  *              <type> *argresp;
 140  *
 141  * xdrs is an instance of a XDR handle, to which or from which the data
 142  * type is to be converted.  argresp is a pointer to the structure to be
 143  * converted.  The XDR handle contains an operation field which indicates
 144  * which of the operations (ENCODE, DECODE * or FREE) is to be performed.
 145  *
 146  * XDR_DECODE may allocate space if the pointer argresp is null.  This
 147  * data can be freed with the XDR_FREE operation.
 148  *
 149  * We write only one procedure per data type to make it easy
 150  * to keep the encode and decode procedures for a data type consistent.
 151  * In many cases the same code performs all operations on a user defined type,
 152  * because all the hard work is done in the component type routines.
 153  * decode as a series of calls on the nested data types.
 154  */
 155
 156 /*
 157  * Xdr operations.  XDR_ENCODE causes the type to be encoded into the
 158  * stream.  XDR_DECODE causes the type to be extracted from the stream.
 159  * XDR_FREE can be used to release the space allocated by an XDR_DECODE
 160  * request.
 161  */
 162 enum xdr_op {
 163     XDR_ENCODE = 0,
 164     XDR_DECODE = 1,
 165     XDR_FREE = 2
 166 };
 167
 168 /*
 169  * This is the number of bytes per unit of external data.
 170  */
 171 #define BYTES_PER_XDR_UNIT      (4)
 172
 173 /*
 174  * A xdrproc_t exists for each data type which is to be encoded or decoded.
 175  *
 176  * The second argument to the xdrproc_t is a pointer to an opaque pointer.
 177  * The opaque pointer generally points to a structure of the data type
 178  * to be decoded.  If this pointer is 0, then the type routines should
 179  * allocate dynamic storage of the appropriate size and return it.
 180  * bool_t       (*xdrproc_t)(XDR *, caddr_t *);
 181  */
 182
 183 /* We need a different prototype for i386 Linux kernel code, because it
 184  * uses a register (rather than stack) based calling convention. The
 185  * normal va_args prototype results in the arguments being placed on the
 186  * stack, where they aren't accessible to the 'real' function.
 187  */
 188 #if defined(AFS_I386_LINUX26_ENV) && defined(KERNEL) && !defined(UKERNEL)
 189 typedef bool_t(*xdrproc_t) (void *, caddr_t, u_int);
 190 #else
 191 typedef bool_t(*xdrproc_t) (void *, ...);
 192 #endif
 193
 194 /*
 195  * The XDR handle.
 196  * Contains operation which is being applied to the stream,
 197  * an operations vector for the paticular implementation (e.g. see xdr_mem.c),
 198  * and two private fields for the use of the particular impelementation.
 199  */
 200
 201 typedef struct __afs_xdr {
 202     enum xdr_op x_op;           /* operation; fast additional param */
 203     struct xdr_ops {
 204         bool_t(*x_getint32) (struct __afs_xdr *xdrs, afs_int32 * lp);   /* get an afs_int32 from underlying stream */
 205         bool_t(*x_putint32) (struct __afs_xdr *xdrs, afs_int32 * lp);   /* put an afs_int32 to " */
 206         bool_t(*x_getbytes) (struct __afs_xdr *xdrs, caddr_t addr, u_int len);  /* get some bytes from " */
 207         bool_t(*x_putbytes) (struct __afs_xdr *xdrs, caddr_t addr, u_int len);  /* put some bytes to " */
 208         u_int(*x_getpostn) (struct __afs_xdr *xdrs);    /* returns bytes off from beginning */
 209         bool_t(*x_setpostn) (struct __afs_xdr *xdrs, u_int pos);        /* lets you reposition the stream */
 210         afs_int32 *(*x_inline) (struct __afs_xdr *xdrs, u_int len);     /* buf quick ptr to buffered data */
 211         void (*x_destroy) (struct __afs_xdr *xdrs);     /* free privates of this xdr_stream */
 212     } *x_ops;
 213     caddr_t x_public;           /* users' data */
 214     caddr_t x_private;          /* pointer to private data */
 215     caddr_t x_base;             /* private used for position info */
 216     int x_handy;                /* extra private word */
 217 } XDR;
 218
 219 /*
 220  * Operations defined on a XDR handle
 221  *
 222  * XDR          *xdrs;
 223  * afs_int32            *int32p;
 224  * caddr_t       addr;
 225  * u_int         len;
 226  * u_int         pos;
 227  */
 228 #define XDR_GETINT32(xdrs, int32p)                      \
 229         (*(xdrs)->x_ops->x_getint32)(xdrs, int32p)
 230 #define xdr_getint32(xdrs, int32p)                      \
 231         (*(xdrs)->x_ops->x_getint32)(xdrs, int32p)
 232
 233 #define XDR_PUTINT32(xdrs, int32p)                      \
 234         (*(xdrs)->x_ops->x_putint32)(xdrs, int32p)
 235 #define xdr_putint32(xdrs, int32p)                      \
 236         (*(xdrs)->x_ops->x_putint32)(xdrs, int32p)
 237
 238 #define XDR_GETBYTES(xdrs, addr, len)                   \
 239         (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
 240 #define xdr_getbytes(xdrs, addr, len)                   \
 241         (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
 242
 243 #define XDR_PUTBYTES(xdrs, addr, len)                   \
 244         (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
 245 #define xdr_putbytes(xdrs, addr, len)                   \
 246         (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
 247
 248 #define XDR_GETPOS(xdrs)                                \
 249         (*(xdrs)->x_ops->x_getpostn)(xdrs)
 250 #define xdr_getpos(xdrs)                                \
 251         (*(xdrs)->x_ops->x_getpostn)(xdrs)
 252
 253 #define XDR_SETPOS(xdrs, pos)                           \
 254         (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
 255 #define xdr_setpos(xdrs, pos)                           \
 256         (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
 257
 258 #define XDR_INLINE(xdrs, len)                           \
 259         (*(xdrs)->x_ops->x_inline)(xdrs, len)
 260 #define xdr_inline(xdrs, len)                           \
 261         (*(xdrs)->x_ops->x_inline)(xdrs, len)
 262
 263 #define XDR_DESTROY(xdrs)                               \
 264         if ((xdrs)->x_ops->x_destroy)                   \
 265                 (*(xdrs)->x_ops->x_destroy)(xdrs)
 266 #define xdr_destroy(xdrs)                               \
 267         if ((xdrs)->x_ops->x_destroy)                   \
 268                 (*(xdrs)->x_ops->x_destroy)(xdrs)
 269
 270 /*
 271  * Support struct for discriminated unions.
 272  * You create an array of xdrdiscrim structures, terminated with
 273  * a entry with a null procedure pointer.  The xdr_union routine gets
 274  * the discriminant value and then searches the array of structures
 275  * for a matching value.  If a match is found the associated xdr routine
 276  * is called to handle that part of the union.  If there is
 277  * no match, then a default routine may be called.
 278  * If there is no match and no default routine it is an error.
 279  */
 280 #define NULL_xdrproc_t ((xdrproc_t)0)
 281 struct xdr_discrim {
 282     int value;
 283     xdrproc_t proc;
 284 };
 285
 286 /*
 287  * In-line routines for fast encode/decode of primitve data types.
 288  * Caveat emptor: these use single memory cycles to get the
 289  * data from the underlying buffer, and will fail to operate
 290  * properly if the data is not aligned.  The standard way to use these
 291  * is to say:
 292  *      if ((buf = XDR_INLINE(xdrs, count)) == NULL)
 293  *              return (FALSE);
 294  *      <<< macro calls >>>
 295  * where ``count'' is the number of bytes of data occupied
 296  * by the primitive data types.
 297  *
 298  * N.B. and frozen for all time: each data type here uses 4 bytes
 299  * of external representation.
 300  */
 301 #define IXDR_GET_INT32(buf)             ntohl(*buf++)
 302 #define IXDR_PUT_INT32(buf, v)          (*buf++ = htonl(v))
 303
 304 #define IXDR_GET_BOOL(buf)              ((bool_t)IXDR_GET_INT32(buf))
 305 #define IXDR_GET_ENUM(buf, t)           ((t)IXDR_GET_INT32(buf))
 306 #define IXDR_GET_U_INT32(buf)           ((afs_uint32)IXDR_GET_INT32(buf))
 307 #define IXDR_GET_SHORT(buf)             ((short)IXDR_GET_INT32(buf))
 308 #define IXDR_GET_U_SHORT(buf)           ((u_short)IXDR_GET_INT32(buf))
 309
 310 #define IXDR_PUT_BOOL(buf, v)           IXDR_PUT_INT32((buf), ((afs_int32)(v)))
 311 #define IXDR_PUT_ENUM(buf, v)           IXDR_PUT_INT32((buf), ((afs_int32)(v)))
 312 #define IXDR_PUT_U_INT32(buf, v)        IXDR_PUT_INT32((buf), ((afs_int32)(v)))
 313 #define IXDR_PUT_SHORT(buf, v)          IXDR_PUT_INT32((buf), ((afs_int32)(v)))
 314 #define IXDR_PUT_U_SHORT(buf, v)        IXDR_PUT_INT32((buf), ((afs_int32)(v)))
 315
 316 #include "xdr_prototypes.h"
 317 #endif /* __XDR_INCLUDE__ */