/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2000-2001 Boris Popov
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/iconv.h>

#include "iconv_converter_if.h"

/*
 * "XLAT" converter
 */

#ifdef MODULE_DEPEND
MODULE_DEPEND(iconv_xlat, libiconv, 2, 2, 2);
#endif

/*
 * XLAT converter instance
 */
struct iconv_xlat {
        KOBJ_FIELDS;
        u_char *                d_table;
        struct iconv_cspair *   d_csp;
};

static int
iconv_xlat_open(struct iconv_converter_class *dcp,
        struct iconv_cspair *csp, struct iconv_cspair *cspf, void **dpp)
{
        struct iconv_xlat *dp;

        dp = (struct iconv_xlat *)kobj_create((struct kobj_class*)dcp, M_ICONV, M_WAITOK);
        dp->d_table = csp->cp_data;
        dp->d_csp = csp;
        csp->cp_refcount++;
        *dpp = (void*)dp;
        return 0;
}

static int
iconv_xlat_close(void *data)
{
        struct iconv_xlat *dp = data;

        dp->d_csp->cp_refcount--;
        kobj_delete((struct kobj*)data, M_ICONV);
        return 0;
}

static int
iconv_xlat_conv(void *d2p, const char **inbuf,
        size_t *inbytesleft, char **outbuf, size_t *outbytesleft,
        int convchar, int casetype)
{
        struct iconv_xlat *dp = (struct iconv_xlat*)d2p;
        const char *src;
        char *dst;
        int n, r;

        if (inbuf == NULL || *inbuf == NULL || outbuf == NULL || *outbuf == NULL)
                return 0;
        if (casetype != 0)
                return -1;
        if (convchar == 1)
                r = n = 1;
        else
                r = n = min(*inbytesleft, *outbytesleft);
        src = *inbuf;
        dst = *outbuf;
        while(r--)
                *dst++ = dp->d_table[(u_char)*src++];
        *inbuf += n;
        *outbuf += n;
        *inbytesleft -= n;
        *outbytesleft -= n;
        return 0;
}

static const char *
iconv_xlat_name(struct iconv_converter_class *dcp)
{
        return "xlat";
}

static kobj_method_t iconv_xlat_methods[] = {
        KOBJMETHOD(iconv_converter_open,        iconv_xlat_open),
        KOBJMETHOD(iconv_converter_close,       iconv_xlat_close),
        KOBJMETHOD(iconv_converter_conv,        iconv_xlat_conv),
#if 0
        KOBJMETHOD(iconv_converter_init,        iconv_xlat_init),
        KOBJMETHOD(iconv_converter_done,        iconv_xlat_done),
#endif
        KOBJMETHOD(iconv_converter_name,        iconv_xlat_name),
        {0, 0}
};

KICONV_CONVERTER(xlat, sizeof(struct iconv_xlat));