486 lines
8.3 KiB
C
486 lines
8.3 KiB
C
/*
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*
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* ===================================
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* HARP | Host ATM Research Platform
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* ===================================
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*
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*
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* This Host ATM Research Platform ("HARP") file (the "Software") is
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* made available by Network Computing Services, Inc. ("NetworkCS")
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* "AS IS". NetworkCS does not provide maintenance, improvements or
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* support of any kind.
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*
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* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
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* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
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* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
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* In no event shall NetworkCS be responsible for any damages, including
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* but not limited to consequential damages, arising from or relating to
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* any use of the Software or related support.
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*
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* Copyright 1994-1998 Network Computing Services, Inc.
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*
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* Copies of this Software may be made, however, the above copyright
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* notice must be reproduced on all copies.
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*
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* @(#) $Id: unisig_mbuf.c,v 1.2 1998/09/17 09:35:02 phk Exp $
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*
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*/
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/*
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* ATM Forum UNI 3.0/3.1 Signalling Manager
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* ----------------------------------------
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*
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* Message buffer handling routines
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*
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*/
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#include <netatm/kern_include.h>
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#include <netatm/uni/unisig_var.h>
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#include <netatm/uni/unisig_mbuf.h>
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#include <netatm/uni/unisig_msg.h>
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#ifndef lint
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__RCSID("@(#) $Id: unisig_mbuf.c,v 1.2 1998/09/17 09:35:02 phk Exp $");
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#endif
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/*
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* Initialize a unisig formatting structure
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*
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* Arguments:
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* usf pointer to a unisig formatting structure
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* usp pointer to a unisig protocol instance
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* buf pointer to a buffer chain (decode only)
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* op operation code (encode or decode)
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* headroom headroom to leave in first buffer
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*
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* Returns:
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* 0 success
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* errno error encountered
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*
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*/
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int
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usf_init(usf, usp, buf, op, headroom)
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struct usfmt *usf;
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struct unisig *usp;
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KBuffer *buf;
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int op;
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int headroom;
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{
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KBuffer *m;
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ATM_DEBUG3("usf_init: usf=%p, buf=%p, op=%d\n",
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usf, buf, op);
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/*
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* Check parameters
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*/
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if (!usf)
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return(EINVAL);
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switch(op) {
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case USF_ENCODE:
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/*
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* Get a buffer
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*/
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KB_ALLOCPKT(m, USF_MIN_ALLOC, KB_F_NOWAIT, KB_T_DATA);
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if (m == NULL)
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return(ENOMEM);
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KB_LEN(m) = 0;
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if (headroom < KB_BFRLEN(m)) {
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KB_HEADSET(m, headroom);
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}
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break;
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case USF_DECODE:
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/*
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* Verify buffer address
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*/
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if (!buf)
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return(EINVAL);
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m = buf;
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break;
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default:
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return(EINVAL);
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}
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/*
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* Save parameters in formatting structure
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*/
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usf->usf_m_addr = m;
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usf->usf_m_base = m;
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usf->usf_loc = 0;
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usf->usf_op = op;
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usf->usf_sig = usp;
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return(0);
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}
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/*
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* Get or put the next byte of a signalling message
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*
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* Arguments:
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* usf pointer to a unisig formatting structure
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* c pointer to the byte to send from or receive into
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*
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* Returns:
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* 0 success
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* errno error encountered
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*
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*/
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int
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usf_byte(usf, c)
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struct usfmt *usf;
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u_char *c;
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{
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u_char *mp;
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KBuffer *m = usf->usf_m_addr, *m1;
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int space;
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switch (usf->usf_op) {
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case USF_DECODE:
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/*
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* Make sure we're not past the end of the buffer
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* (allowing for zero-length buffers)
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*/
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while (usf->usf_loc >= KB_LEN(m)) {
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if (KB_NEXT(usf->usf_m_addr)) {
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usf->usf_m_addr = m = KB_NEXT(usf->usf_m_addr);
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usf->usf_loc = 0;
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} else {
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return(EMSGSIZE);
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}
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}
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/*
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* Get the data from the buffer
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*/
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KB_DATASTART(m, mp, u_char *);
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*c = mp[usf->usf_loc];
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usf->usf_loc++;
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break;
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case USF_ENCODE:
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/*
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* If the current buffer is full, get another
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*/
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KB_TAILROOM(m, space);
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if (space == 0) {
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KB_ALLOC(m1, USF_MIN_ALLOC, KB_F_NOWAIT, KB_T_DATA);
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if (m1 == NULL)
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return(ENOMEM);
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KB_LEN(m1) = 0;
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KB_LINK(m1, m);
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usf->usf_m_addr = m = m1;
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usf->usf_loc = 0;
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}
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/*
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* Put the data into the buffer
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*/
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KB_DATASTART(m, mp, u_char *);
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mp[usf->usf_loc] = *c;
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KB_TAILADJ(m, 1);
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usf->usf_loc++;
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break;
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default:
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/*
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* Invalid operation code
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*/
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return(EINVAL);
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}
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return(0);
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}
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/*
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* Get or put a short integer
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*
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* Arguments:
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* usf pointer to a unisig formatting structure
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* s pointer to a short to send from or receive into
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*
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* Returns:
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* 0 success
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* errno error encountered
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*
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*/
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int
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usf_short(usf, s)
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struct usfmt *usf;
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u_short *s;
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{
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int rc;
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union {
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u_short value;
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u_char b[sizeof(u_short)];
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} tval;
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tval.value = 0;
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if (usf->usf_op == USF_ENCODE)
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tval.value = htons(*s);
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if (rc = usf_byte(usf, &tval.b[0]))
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return(rc);
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if (rc = usf_byte(usf, &tval.b[1]))
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return(rc);
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if (usf->usf_op == USF_DECODE)
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*s = ntohs(tval.value);
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return(0);
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}
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/*
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* Get or put a 3-byte integer
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*
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* Arguments:
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* usf pointer to a unisig formatting structure
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* i pointer to an integer to send from or receive into
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*
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* Returns:
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* 0 success
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* errno error encountered
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*
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*/
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int
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usf_int3(usf, i)
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struct usfmt *usf;
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u_int *i;
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{
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int j, rc;
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union {
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u_int value;
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u_char b[sizeof(u_int)];
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} tval;
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tval.value = 0;
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if (usf->usf_op == USF_ENCODE)
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tval.value = htonl(*i);
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for (j=0; j<3; j++) {
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rc = usf_byte(usf, &tval.b[j+sizeof(u_int)-3]);
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if (rc)
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return(rc);
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}
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if (usf->usf_op == USF_DECODE)
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*i = ntohl(tval.value);
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return(rc);
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}
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/*
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* Get or put an integer
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*
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* Arguments:
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* usf pointer to a unisig formatting structure
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* i pointer to an integer to send from or receive into
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*
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* Returns:
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* 0 success
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* errno error encountered
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*
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*/
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int
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usf_int(usf, i)
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struct usfmt *usf;
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u_int *i;
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{
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int j, rc;
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union {
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u_int value;
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u_char b[sizeof(u_int)];
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} tval;
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if (usf->usf_op == USF_ENCODE)
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tval.value = htonl(*i);
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for (j=0; j<4; j++) {
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rc = usf_byte(usf, &tval.b[j+sizeof(u_int)-4]);
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if (rc)
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return(rc);
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}
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if (usf->usf_op == USF_DECODE)
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*i = ntohl(tval.value);
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return(rc);
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}
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/*
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* Get or put an extented field
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*
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* An extented field consists of a string of bytes. All but the last
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* byte of the field has the high-order bit set to zero. When decoding,
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* this routine will read bytes until either the input is exhausted or
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* a byte with a high-order one is found. Whe encoding, it will take an
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* unsigned integer and write until the highest-order one bit has been
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* written.
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*
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* Arguments:
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* usf pointer to a unisig formatting structure
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* i pointer to an integer to send from or receive into
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*
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* Returns:
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* 0 success
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* errno error encountered
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*
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*/
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int
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usf_ext(usf, i)
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struct usfmt *usf;
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u_int *i;
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{
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int j, rc;
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u_char c, buff[sizeof(u_int)+1];
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u_int val;
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union {
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u_int value;
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u_char b[sizeof(u_int)];
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} tval;
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switch(usf->usf_op) {
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case USF_ENCODE:
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val = *i;
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j = 0;
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while (val) {
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tval.value = htonl(val);
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buff[j] = tval.b[sizeof(u_int)-1] & UNI_IE_EXT_MASK;
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val >>= 7;
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j++;
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}
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j--;
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buff[0] |= UNI_IE_EXT_BIT;
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for (; j>=0; j--) {
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rc = usf_byte(usf, &buff[j]);
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if (rc)
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return(rc);
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}
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break;
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case USF_DECODE:
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c = 0;
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val = 0;
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while (!(c & UNI_IE_EXT_BIT)) {
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rc = usf_byte(usf, &c);
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if (rc)
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return(rc);
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val = (val << 7) + (c & UNI_IE_EXT_MASK);
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}
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*i = val;
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break;
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default:
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return(EINVAL);
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}
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return(0);
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}
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/*
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* Count the bytes remaining to be decoded
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*
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* Arguments:
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* usf pointer to a unisig formatting structure
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*
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* Returns:
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* int the number of bytes in the buffer chain remaining to
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* be decoded
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*
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*/
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int
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usf_count(usf)
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struct usfmt *usf;
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{
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int count;
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KBuffer *m = usf->usf_m_addr;
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/*
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* Return zero if we're not decoding
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*/
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if (usf->usf_op != USF_DECODE)
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return (0);
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/*
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* Calculate the length of data remaining in the current buffer
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*/
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count = KB_LEN(m) - usf->usf_loc;
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/*
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* Loop through any remaining buffers, adding in their lengths
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*/
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while (KB_NEXT(m)) {
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m = KB_NEXT(m);
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count += KB_LEN(m);
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}
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return(count);
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}
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/*
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* Get or put the next byte of a signalling message and return
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* the byte's buffer address
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*
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* Arguments:
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* usf pointer to a unisig formatting structure
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* c pointer to the byte to send from or receive into
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* bp address to store the byte's buffer address
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*
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* Returns:
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* 0 success
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* errno error encountered
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*
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*/
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int
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usf_byte_mark(usf, c, bp)
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struct usfmt *usf;
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u_char *c;
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u_char **bp;
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{
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u_char *mp;
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int rc;
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/*
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* First, get/put the data byte
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*/
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rc = usf_byte(usf, c);
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if (rc) {
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/*
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* Error encountered
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*/
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*bp = NULL;
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return (rc);
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}
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/*
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* Now return the buffer address of that byte
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*/
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KB_DATASTART(usf->usf_m_addr, mp, u_char *);
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*bp = &mp[usf->usf_loc - 1];
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return (0);
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}
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