/*

 * Copyright (c) 2022 Pierre-Anthony Lemieux <pal@palemieux.com>

 *                    Zane van Iperen <zane@zanevaniperen.com>

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

/*

 * Copyright (C) 1996, 1997 Theodore Ts'o.

 *

 * 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, and the entire permission notice in its entirety,

 *    including the disclaimer of warranties.

 * 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.

 * 3. The name of the author may not be used to endorse or promote

 *    products derived from this software without specific prior

 *    written permission.

 *

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED

 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF

 * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR 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 NOT ADVISED OF THE POSSIBILITY OF SUCH

 * DAMAGE.

 */

/**

 * @file

 * UUID parsing and serialization utilities.

 * The library treat the UUID as an opaque sequence of 16 unsigned bytes,

 * i.e. ignoring the internal layout of the UUID, which depends on the type

 * of the UUID.

 *

 * @author Pierre-Anthony Lemieux <pal@palemieux.com>

 * @author Zane van Iperen <zane@zanevaniperen.com>

 */

#include "uuid.h"

#include "error.h"

#include "avstring.h"

int av_uuid_parse(const char *in, AVUUID uu)

{

    if (strlen(in) != 36)

        return AVERROR(EINVAL);

    return av_uuid_parse_range(in, in + 36, uu);

}

static int xdigit_to_int(char c)

{

    c = av_tolower(c);

    if (c >= 'a' && c <= 'f')

        return c - 'a' + 10;

    if (c >= '0' && c <= '9')

        return c - '0';

    return -1;

}

int av_uuid_parse_range(const char *in_start, const char *in_end, AVUUID uu)

{

    int i;

    const char *cp;

    if ((in_end - in_start) != 36)

        return AVERROR(EINVAL);

    for (i = 0, cp = in_start; i < 16; i++) {

        int hi;

        int lo;

        if (i == 4 || i == 6 || i == 8 || i == 10)

            cp++;

        hi = xdigit_to_int(*cp++);

        lo = xdigit_to_int(*cp++);

        if (hi == -1 || lo == -1)

            return AVERROR(EINVAL);

        uu[i] = (hi << 4) + lo;

    }

    return 0;

}

static const char hexdigits_lower[16] = "0123456789abcdef";

void av_uuid_unparse(const AVUUID uuid, char *out)

{

    char *p = out;

    for (int i = 0; i < 16; i++) {

        uint8_t tmp;

        if (i == 4 || i == 6 || i == 8 || i == 10)

            *p++ = '-';

        tmp = uuid[i];

        *p++ = hexdigits_lower[tmp >> 4];

        *p++ = hexdigits_lower[tmp & 15];

    }

    *p = '\0';

}

int av_uuid_urn_parse(const char *in, AVUUID uu)

{

    if (av_stristr(in, "urn:uuid:") != in)

        return AVERROR(EINVAL);

    return av_uuid_parse(in + 9, uu);

}