scanner_cis_bitwise.c

来自「基于sip协议的网络电话源码」· C语言 代码 · 共 69 行

/* $Id: scanner_cis_bitwise.c 974 2007-02-19 01:13:53Z bennylp $ */
/* 
 * Copyright (C) 2003-2007 Benny Prijono <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
 */

/*
 * THIS FILE IS INCLUDED BY scanner.c.
 * DO NOT COMPILE THIS FILE ALONE!
 */

PJ_DEF(void) pj_cis_buf_init( pj_cis_buf_t *cis_buf)
{
    pj_bzero(cis_buf->cis_buf, sizeof(cis_buf->cis_buf));
    cis_buf->use_mask = 0;
}

PJ_DEF(pj_status_t) pj_cis_init(pj_cis_buf_t *cis_buf, pj_cis_t *cis)
{
    unsigned i;

    cis->cis_buf = cis_buf->cis_buf;

    for (i=0; i<PJ_CIS_MAX_INDEX; ++i) {
        if ((cis_buf->use_mask & (1 << i)) == 0) {
            cis->cis_id = i;
	    cis_buf->use_mask |= (1 << i);
            return PJ_SUCCESS;
        }
    }

    cis->cis_id = PJ_CIS_MAX_INDEX;
    return PJ_ETOOMANY;
}

PJ_DEF(pj_status_t) pj_cis_dup( pj_cis_t *new_cis, pj_cis_t *existing)
{
    pj_status_t status;
    unsigned i;

    /* Warning: typecasting here! */
    status = pj_cis_init((pj_cis_buf_t*)existing->cis_buf, new_cis);
    if (status != PJ_SUCCESS)
        return status;

    for (i=0; i<256; ++i) {
        if (PJ_CIS_ISSET(existing, i))
            PJ_CIS_SET(new_cis, i);
        else
            PJ_CIS_CLR(new_cis, i);
    }

    return PJ_SUCCESS;
}