/*
 * This file is part of AtomVM.
 *
 * Copyright 2024 Davide Bettio <davide@uninstall.it>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
 */

#include <stdbool.h>
#include <stddef.h>

#include "unicode.h"

size_t unicode_buf_utf8_len(const uint8_t *buf, size_t buf_len)
{
    size_t count = 0;

    for (size_t i = 0; i < buf_len; i++) {
        // we count either ASCII characters or the first byte of a unicode sequence
        if ((buf[i] & 0xC0) != 0x80) {
            count++;
        }
    }

    return count;
}

bool unicode_buf_is_ascii(const uint8_t *buf, size_t len)
{
    for (size_t i = 0; i < len; i++) {
        if (buf[i] > 0x7F) {
            return false;
        }
    }

    return true;
}

size_t unicode_latin1_buf_size_as_utf8(const uint8_t *buf, size_t len)
{
    size_t required_size = 0;
    for (size_t i = 0; i < len; i++) {
        required_size += (buf[i] > 0x7F) ? 2 : 1;
    }

    return required_size;
}
