+++ /dev/null
-/* @(#)xdr_rec.c 2.2 88/08/01 4.0 RPCSRC */
-/*
- * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
- * unrestricted use provided that this legend is included on all tape
- * media and as a part of the software program in whole or part. Users
- * may copy or modify Sun RPC without charge, but are not authorized
- * to license or distribute it to anyone else except as part of a product or
- * program developed by the user.
- *
- * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
- * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
- *
- * Sun RPC is provided with no support and without any obligation on the
- * part of Sun Microsystems, Inc. to assist in its use, correction,
- * modification or enhancement.
- *
- * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
- * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
- * OR ANY PART THEREOF.
- *
- * In no event will Sun Microsystems, Inc. be liable for any lost revenue
- * or profits or other special, indirect and consequential damages, even if
- * Sun has been advised of the possibility of such damages.
- *
- * Sun Microsystems, Inc.
- * 2550 Garcia Avenue
- * Mountain View, California 94043
- */
-#if !defined(lint) && defined(SCCSIDS)
-static char sccsid[] = "@(#)xdr_rec.c 1.21 87/08/11 Copyr 1984 Sun Micro";
-#endif
-
-/*
- * xdr_rec.c, Implements TCP/IP based XDR streams with a "record marking"
- * layer above tcp (for rpc's use).
- *
- * Copyright (C) 1984, Sun Microsystems, Inc.
- *
- * These routines interface XDRSTREAMS to a tcp/ip connection.
- * There is a record marking layer between the xdr stream
- * and the tcp transport level. A record is composed on one or more
- * record fragments. A record fragment is a thirty-two bit header followed
- * by n bytes of data, where n is contained in the header. The header
- * is represented as a htonl(u_long). Thegh order bit encodes
- * whether or not the fragment is the last fragment of the record
- * (1 => fragment is last, 0 => more fragments to follow.
- * The other 31 bits encode the byte length of the fragment.
- */
-
-#include <config.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#ifdef HAVE_ARPA_INET_H
-#include <arpa/inet.h>
-#endif
-
-#include <rpc/types.h>
-#include <rpc/xdr.h>
-
-#include "byteswap.h"
-
-extern long lseek();
-
-static u_int fix_buf_size();
-
-static bool_t xdrrec_getlong();
-static bool_t xdrrec_putlong();
-static bool_t xdrrec_getbytes();
-static bool_t xdrrec_putbytes();
-static u_int xdrrec_getpos();
-static bool_t xdrrec_setpos();
-static long * xdrrec_inline();
-static void xdrrec_destroy();
-
-static struct xdr_ops xdrrec_ops = {
- xdrrec_getlong,
- xdrrec_putlong,
- xdrrec_getbytes,
- xdrrec_putbytes,
- xdrrec_getpos,
- xdrrec_setpos,
- xdrrec_inline,
- xdrrec_destroy
-};
-
-/*
- * A record is composed of one or more record fragments.
- * A record fragment is a two-byte header followed by zero to
- * 2**32-1 bytes. The header is treated as a long unsigned and is
- * encode/decoded to the network via htonl/ntohl. The low order 31 bits
- * are a byte count of the fragment. The highest order bit is a boolean:
- * 1 => this fragment is the last fragment of the record,
- * 0 => this fragment is followed by more fragment(s).
- *
- * The fragment/record machinery is not general; it is constructed to
- * meet the needs of xdr and rpc based on tcp.
- */
-
-#define LAST_FRAG ((u_long)(1 << 31))
-
-typedef struct rec_strm {
- caddr_t tcp_handle;
- caddr_t the_buffer;
- /*
- * out-goung bits
- */
- int (*writeit)();
- caddr_t out_base; /* output buffer (points to frag header) */
- caddr_t out_finger; /* next output position */
- caddr_t out_boundry; /* data cannot up to this address */
- u_long *frag_header; /* beginning of curren fragment */
- bool_t frag_sent; /* true if buffer sent in middle of record */
- /*
- * in-coming bits
- */
- int (*readit)();
- u_long in_size; /* fixed size of the input buffer */
- caddr_t in_base;
- caddr_t in_finger; /* location of next byte to be had */
- caddr_t in_boundry; /* can read up to this location */
- long fbtbc; /* fragment bytes to be consumed */
- bool_t last_frag;
- u_int sendsize;
- u_int recvsize;
-} RECSTREAM;
-
-static bool_t flush_out(register RECSTREAM *, bool_t );
-static bool_t get_input_bytes(register RECSTREAM *, register caddr_t, register int );
-static bool_t set_input_fragment(register RECSTREAM *);
-static bool_t skip_input_bytes(register RECSTREAM *, long);
-
-/*
- * Create an xdr handle for xdrrec
- * xdrrec_create fills in xdrs. Sendsize and recvsize are
- * send and recv buffer sizes (0 => use default).
- * tcp_handle is an opaque handle that is passed as the first parameter to
- * the procedures readit and writeit. Readit and writeit are read and
- * write respectively. They are like the system
- * calls expect that they take an opaque handle rather than an fd.
- */
-void
-xdrrec_create(xdrs, sendsize, recvsize, tcp_handle, readit, writeit)
- register XDR *xdrs;
- register u_int sendsize;
- register u_int recvsize;
- caddr_t tcp_handle;
- int (*readit)(); /* like read, but pass it a tcp_handle, not sock */
- int (*writeit)(); /* like write, but pass it a tcp_handle, not sock */
-{
- register RECSTREAM *rstrm =
- (RECSTREAM *)mem_alloc(sizeof(RECSTREAM));
-
- if (rstrm == NULL) {
- (void)fprintf(stderr, "xdrrec_create: out of memory\n");
- /*
- * This is bad. Should rework xdrrec_create to
- * return a handle, and in this case return NULL
- */
- return;
- }
- /*
- * adjust sizes and allocate buffer quad byte aligned
- */
- rstrm->sendsize = sendsize = fix_buf_size(sendsize);
- rstrm->recvsize = recvsize = fix_buf_size(recvsize);
- rstrm->the_buffer = mem_alloc(sendsize + recvsize + BYTES_PER_XDR_UNIT);
- if (rstrm->the_buffer == NULL) {
- (void)fprintf(stderr, "xdrrec_create: out of memory\n");
- return;
- }
- for (rstrm->out_base = rstrm->the_buffer;
- (long) rstrm->out_base % BYTES_PER_XDR_UNIT != 0;
- rstrm->out_base++);
- rstrm->in_base = rstrm->out_base + sendsize;
- /*
- * now the rest ...
- */
- xdrs->x_ops = &xdrrec_ops;
- xdrs->x_private = (caddr_t)rstrm;
- rstrm->tcp_handle = tcp_handle;
- rstrm->readit = readit;
- rstrm->writeit = writeit;
- rstrm->out_finger = rstrm->out_boundry = rstrm->out_base;
- rstrm->frag_header = (u_long *)rstrm->out_base;
- rstrm->out_finger += sizeof(u_long);
- rstrm->out_boundry += sendsize;
- rstrm->frag_sent = FALSE;
- rstrm->in_size = recvsize;
- rstrm->in_boundry = rstrm->in_base;
- rstrm->in_finger = (rstrm->in_boundry += recvsize);
- rstrm->fbtbc = 0;
- rstrm->last_frag = TRUE;
-}
-
-
-/*
- * The reoutines defined below are the xdr ops which will go into the
- * xdr handle filled in by xdrrec_create.
- */
-
-static bool_t
-xdrrec_getlong(xdrs, lp)
- XDR *xdrs;
- long *lp;
-{
- register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
- register long *buflp = (long *)(rstrm->in_finger);
- long mylong;
-
- /* first try the inline, fast case */
- if ((rstrm->fbtbc >= sizeof(long)) &&
- ((rstrm->in_boundry - (caddr_t) buflp) >= sizeof(long))) {
- *lp = (long)ntohl((u_long)(*buflp));
- rstrm->fbtbc -= sizeof(long);
- rstrm->in_finger += sizeof(long);
- } else {
- if (! xdrrec_getbytes(xdrs, (caddr_t)&mylong, sizeof(long)))
- return (FALSE);
- *lp = (long)ntohl((u_long)mylong);
- }
- return (TRUE);
-}
-
-static bool_t
-xdrrec_putlong(xdrs, lp)
- XDR *xdrs;
- long *lp;
-{
- register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
- register long *dest_lp = ((long *)(rstrm->out_finger));
-
- if ((rstrm->out_finger += sizeof(long)) > rstrm->out_boundry) {
- /*
- * this case should almost never happen so the code is
- * inefficient
- */
- rstrm->out_finger -= sizeof(long);
- rstrm->frag_sent = TRUE;
- if (! flush_out(rstrm, FALSE))
- return (FALSE);
- dest_lp = ((long *)(rstrm->out_finger));
- rstrm->out_finger += sizeof(long);
- }
- *dest_lp = (long)htonl((u_long)(*lp));
- return (TRUE);
-}
-
-static bool_t /* must manage buffers, fragments, and records */
-xdrrec_getbytes(xdrs, addr, len)
- XDR *xdrs;
- register caddr_t addr;
- register u_int len;
-{
- register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
- register int current;
-
- while (len > 0) {
- current = rstrm->fbtbc;
- if (current == 0) {
- if (rstrm->last_frag)
- return (FALSE);
- if (! set_input_fragment(rstrm))
- return (FALSE);
- continue;
- }
- current = (len < current) ? len : current;
- if (! get_input_bytes(rstrm, addr, current))
- return (FALSE);
- addr += current;
- rstrm->fbtbc -= current;
- len -= current;
- }
- return (TRUE);
-}
-
-static bool_t
-xdrrec_putbytes(xdrs, addr, len)
- XDR *xdrs;
- register caddr_t addr;
- register u_int len;
-{
- register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
- register int current;
-
- while (len > 0) {
- current = rstrm->out_boundry - rstrm->out_finger;
- current = (len < current) ? len : current;
- memcpy (rstrm->out_finger, addr, current);
- rstrm->out_finger += current;
- addr += current;
- len -= current;
- if (rstrm->out_finger == rstrm->out_boundry) {
- rstrm->frag_sent = TRUE;
- if (! flush_out(rstrm, FALSE))
- return (FALSE);
- }
- }
- return (TRUE);
-}
-
-static u_int
-xdrrec_getpos(xdrs)
- register XDR *xdrs;
-{
- register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
- register long pos;
-
- pos = lseek(rstrm->tcp_handle, (long) 0, 1);
- if (pos != -1)
- switch (xdrs->x_op) {
-
- case XDR_ENCODE:
- pos += rstrm->out_finger - rstrm->out_base;
- break;
-
- case XDR_DECODE:
- pos -= rstrm->in_boundry - rstrm->in_finger;
- break;
-
- default:
- pos = (u_int) -1;
- break;
- }
- return ((u_int) pos);
-}
-
-static bool_t
-xdrrec_setpos(xdrs, pos)
- register XDR *xdrs;
- u_int pos;
-{
- register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
- u_int currpos = xdrrec_getpos(xdrs);
- int delta = currpos - pos;
- caddr_t newpos;
-
- if ((int)currpos != -1)
- switch (xdrs->x_op) {
-
- case XDR_FREE: break; /* keep gcc happy */
-
- case XDR_ENCODE:
- newpos = rstrm->out_finger - delta;
- if ((newpos > (caddr_t)(rstrm->frag_header)) &&
- (newpos < rstrm->out_boundry)) {
- rstrm->out_finger = newpos;
- return (TRUE);
- }
- break;
-
- case XDR_DECODE:
- newpos = rstrm->in_finger - delta;
- if ((delta < (int)(rstrm->fbtbc)) &&
- (newpos <= rstrm->in_boundry) &&
- (newpos >= rstrm->in_base)) {
- rstrm->in_finger = newpos;
- rstrm->fbtbc -= delta;
- return (TRUE);
- }
- break;
- }
- return (FALSE);
-}
-
-static long *
-xdrrec_inline(xdrs, len)
- register XDR *xdrs;
- int len;
-{
- register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
- long * buf = NULL;
-
- switch (xdrs->x_op) {
-
- case XDR_FREE: break; /* keep gcc happy */
-
- case XDR_ENCODE:
- if ((rstrm->out_finger + len) <= rstrm->out_boundry) {
- buf = (long *) rstrm->out_finger;
- rstrm->out_finger += len;
- }
- break;
-
- case XDR_DECODE:
- if ((len <= rstrm->fbtbc) &&
- ((rstrm->in_finger + len) <= rstrm->in_boundry)) {
- buf = (long *) rstrm->in_finger;
- rstrm->fbtbc -= len;
- rstrm->in_finger += len;
- }
- break;
- }
- return (buf);
-}
-
-static void
-xdrrec_destroy(xdrs)
- register XDR *xdrs;
-{
- register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private;
-
- mem_free(rstrm->the_buffer,
- rstrm->sendsize + rstrm->recvsize + BYTES_PER_XDR_UNIT);
- mem_free((caddr_t)rstrm, sizeof(RECSTREAM));
-}
-
-
-/*
- * Exported routines to manage xdr records
- */
-
-/*
- * Before reading (deserializing from the stream, one should always call
- * this procedure to guarantee proper record alignment.
- */
-bool_t
-xdrrec_skiprecord(xdrs)
- XDR *xdrs;
-{
- register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
-
- while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) {
- if (! skip_input_bytes(rstrm, rstrm->fbtbc))
- return (FALSE);
- rstrm->fbtbc = 0;
- if ((! rstrm->last_frag) && (! set_input_fragment(rstrm)))
- return (FALSE);
- }
- rstrm->last_frag = FALSE;
- return (TRUE);
-}
-
-/*
- * Look ahead fuction.
- * Returns TRUE iff there is no more input in the buffer
- * after consuming the rest of the current record.
- */
-bool_t
-xdrrec_eof(xdrs)
- XDR *xdrs;
-{
- register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
-
- while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) {
- if (! skip_input_bytes(rstrm, rstrm->fbtbc))
- return (TRUE);
- rstrm->fbtbc = 0;
- if ((! rstrm->last_frag) && (! set_input_fragment(rstrm)))
- return (TRUE);
- }
- if (rstrm->in_finger == rstrm->in_boundry)
- return (TRUE);
- return (FALSE);
-}
-
-/*
- * The client must tell the package when an end-of-record has occurred.
- * The second paraemters tells whether the record should be flushed to the
- * (output) tcp stream. (This let's the package support batched or
- * pipelined procedure calls.) TRUE => immmediate flush to tcp connection.
- */
-bool_t
-xdrrec_endofrecord(xdrs, sendnow)
- XDR *xdrs;
- bool_t sendnow;
-{
- register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private);
- register u_long len; /* fragment length */
-
- if (sendnow || rstrm->frag_sent ||
- ((u_long)rstrm->out_finger + sizeof(u_long) >=
- (u_long)rstrm->out_boundry)) {
- rstrm->frag_sent = FALSE;
- return (flush_out(rstrm, TRUE));
- }
- len = (u_long)(rstrm->out_finger) - (u_long)(rstrm->frag_header) -
- sizeof(u_long);
- *(rstrm->frag_header) = htonl((u_long)len | LAST_FRAG);
- rstrm->frag_header = (u_long *)rstrm->out_finger;
- rstrm->out_finger += sizeof(u_long);
- return (TRUE);
-}
-
-
-/*
- * Internal useful routines
- */
-static bool_t
-flush_out(rstrm, eor)
- register RECSTREAM *rstrm;
- bool_t eor;
-{
- register u_long eormask = (eor == TRUE) ? LAST_FRAG : 0;
- register u_long len = (u_long)(rstrm->out_finger) -
- (u_long)(rstrm->frag_header) - sizeof(u_long);
-
- *(rstrm->frag_header) = htonl(len | eormask);
- len = (u_long)(rstrm->out_finger) - (u_long)(rstrm->out_base);
- if ((*(rstrm->writeit))(rstrm->tcp_handle, rstrm->out_base, (int)len)
- != (int)len)
- return (FALSE);
- rstrm->frag_header = (u_long *)rstrm->out_base;
- rstrm->out_finger = (caddr_t)rstrm->out_base + sizeof(u_long);
- return (TRUE);
-}
-
-static bool_t /* knows nothing about records! Only about input buffers */
-fill_input_buf(rstrm)
- register RECSTREAM *rstrm;
-{
- register caddr_t where;
- u_int i;
- register int len;
-
- where = rstrm->in_base;
- i = (long) rstrm->in_boundry % BYTES_PER_XDR_UNIT;
- where += i;
- len = rstrm->in_size - i;
- if ((len = (*(rstrm->readit))(rstrm->tcp_handle, where, len)) == -1)
- return (FALSE);
- rstrm->in_finger = where;
- where += len;
- rstrm->in_boundry = where;
- return (TRUE);
-}
-
-static bool_t /* knows nothing about records! Only about input buffers */
-get_input_bytes(rstrm, addr, len)
- register RECSTREAM *rstrm;
- register caddr_t addr;
- register int len;
-{
- register int current;
-
- while (len > 0) {
- current = rstrm->in_boundry - rstrm->in_finger;
- if (current == 0) {
- if (! fill_input_buf(rstrm))
- return (FALSE);
- continue;
- }
- current = (len < current) ? len : current;
- memcpy (addr, rstrm->in_finger, current);
- rstrm->in_finger += current;
- addr += current;
- len -= current;
- }
- return (TRUE);
-}
-
-static bool_t /* next two bytes of the input stream are treated as a header */
-set_input_fragment(rstrm)
- register RECSTREAM *rstrm;
-{
- u_long header;
-
- if (! get_input_bytes(rstrm, (caddr_t)&header, sizeof(header)))
- return (FALSE);
- header = (long)ntohl(header);
- rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE;
- rstrm->fbtbc = header & (~LAST_FRAG);
- return (TRUE);
-}
-
-static bool_t /* consumes input bytes; knows nothing about records! */
-skip_input_bytes(rstrm, cnt)
- register RECSTREAM *rstrm;
- long cnt;
-{
- register int current;
-
- while (cnt > 0) {
- current = rstrm->in_boundry - rstrm->in_finger;
- if (current == 0) {
- if (! fill_input_buf(rstrm))
- return (FALSE);
- continue;
- }
- current = (cnt < current) ? cnt : current;
- rstrm->in_finger += current;
- cnt -= current;
- }
- return (TRUE);
-}
-
-static u_int
-fix_buf_size(s)
- register u_int s;
-{
-
- if (s < 100)
- s = 4000;
- return (RNDUP(s));
-}
git.annexia.org / portablexdr.git / blobdiff