diff options
Diffstat (limited to 'lib/libc/xdr/xdr_rec.c')
| -rw-r--r-- | lib/libc/xdr/xdr_rec.c | 586 |
1 files changed, 0 insertions, 586 deletions
diff --git a/lib/libc/xdr/xdr_rec.c b/lib/libc/xdr/xdr_rec.c deleted file mode 100644 index f54172b..0000000 --- a/lib/libc/xdr/xdr_rec.c +++ /dev/null @@ -1,586 +0,0 @@ -/* - * 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(LIBC_SCCS) && !defined(lint) -/*static char *sccsid = "from: @(#)xdr_rec.c 1.21 87/08/11 Copyr 1984 Sun Micro";*/ -/*static char *sccsid = "from: @(#)xdr_rec.c 2.2 88/08/01 4.0 RPCSRC";*/ -static char *rcsid = "$Id: xdr_rec.c,v 1.5 1996/12/30 14:07:10 peter Exp $"; -#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 <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <rpc/types.h> -#include <rpc/xdr.h> -#include <netinet/in.h> - -static u_int fix_buf_size(); -static bool_t flush_out(); -static bool_t get_input_bytes(); -static bool_t set_input_fragment(); -static bool_t skip_input_bytes(); - -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 int32_t *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_int32_t)(1 << 31)) - -typedef struct rec_strm { - caddr_t tcp_handle; - caddr_t the_buffer; - /* - * out-goung bits - */ - int (*writeit) __P((caddr_t, caddr_t, int)); - 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_int32_t *frag_header; /* beginning of current fragment */ - bool_t frag_sent; /* true if buffer sent in middle of record */ - /* - * in-coming bits - */ - int (*readit) __P((caddr_t, caddr_t, int)); - 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; - - -/* - * 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; - (u_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_int32_t *)rstrm->out_base; - rstrm->out_finger += sizeof(u_int32_t); - 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 int32_t *buflp = (int32_t *)(rstrm->in_finger); - int32_t mylong; - - /* first try the inline, fast case */ - if ((rstrm->fbtbc >= sizeof(int32_t)) && - (((long)rstrm->in_boundry - (long)buflp) >= sizeof(int32_t))) { - *lp = (long)ntohl((u_int32_t)(*buflp)); - rstrm->fbtbc -= sizeof(int32_t); - rstrm->in_finger += sizeof(int32_t); - } else { - if (! xdrrec_getbytes(xdrs, (caddr_t)&mylong, sizeof(int32_t))) - return (FALSE); - *lp = (long)ntohl((u_int32_t)mylong); - } - return (TRUE); -} - -static bool_t -xdrrec_putlong(xdrs, lp) - XDR *xdrs; - long *lp; -{ - register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); - register int32_t *dest_lp = ((int32_t *)(rstrm->out_finger)); - - if ((rstrm->out_finger += sizeof(int32_t)) > rstrm->out_boundry) { - /* - * this case should almost never happen so the code is - * inefficient - */ - rstrm->out_finger -= sizeof(int32_t); - rstrm->frag_sent = TRUE; - if (! flush_out(rstrm, FALSE)) - return (FALSE); - dest_lp = ((int32_t *)(rstrm->out_finger)); - rstrm->out_finger += sizeof(int32_t); - } - *dest_lp = (int32_t)htonl((u_int32_t)(*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 long current; - - while (len > 0) { - current = (u_long)rstrm->out_boundry - - (u_long)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((int)(long)rstrm->tcp_handle, (off_t) 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 = -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_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 int32_t * -xdrrec_inline(xdrs, len) - register XDR *xdrs; - int len; -{ - register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; - int32_t * buf = NULL; - - switch (xdrs->x_op) { - - case XDR_ENCODE: - if ((rstrm->out_finger + len) <= rstrm->out_boundry) { - buf = (int32_t *) rstrm->out_finger; - rstrm->out_finger += len; - } - break; - - case XDR_DECODE: - if ((len <= rstrm->fbtbc) && - ((rstrm->in_finger + len) <= rstrm->in_boundry)) { - buf = (int32_t *) 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_int32_t) >= - (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_int32_t); - *(rstrm->frag_header) = htonl((u_long)len | LAST_FRAG); - rstrm->frag_header = (u_int32_t *)rstrm->out_finger; - rstrm->out_finger += sizeof(u_int32_t); - 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_int32_t len = (u_long)(rstrm->out_finger) - - (u_long)(rstrm->frag_header) - sizeof(u_int32_t); - - *(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_int32_t *)rstrm->out_base; - rstrm->out_finger = (caddr_t)rstrm->out_base + sizeof(u_int32_t); - 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_long i; - register long len; - - where = rstrm->in_base; - i = (u_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 long current; - - while (len > 0) { - current = (long)rstrm->in_boundry - (long)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_int32_t 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 long current; - - while (cnt > 0) { - current = (long)rstrm->in_boundry - (long)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)); -} |
