/*
 * Copyright (c) 2020 - 2024 the ThorVG project. All rights reserved.

 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:

 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <cstring>
#include "tvgSvgUtil.h"

/************************************************************************/
/* Internal Class Implementation                                        */
/************************************************************************/

static uint8_t _hexCharToDec(const char c)
{
    if (c >= 'a') return c - 'a' + 10;
    else if (c >= 'A') return c - 'A' + 10;
    else return c - '0';
}


/************************************************************************/
/* External Class Implementation                                        */
/************************************************************************/

size_t svgUtilURLDecode(const char *src, char** dst)
{
    if (!src) return 0;

    auto length = strlen(src);
    if (length == 0) return 0;

    char* decoded = (char*)malloc(sizeof(char) * length + 1);

    char a, b;
    int idx =0;
    while (*src) {
        if (*src == '%' &&
            ((a = src[1]) && (b = src[2])) &&
            (isxdigit(a) && isxdigit(b))) {
            decoded[idx++] = (_hexCharToDec(a) << 4) + _hexCharToDec(b);
            src+=3;
        } else if (*src == '+') {
            decoded[idx++] = ' ';
            src++;
        } else {
            decoded[idx++] = *src++;
        }
    }
    decoded[idx] = '\0';

    *dst = decoded;
    return idx + 1;
}

