Function urldecode

libavformat/urldecode.c:37–78

#include "urldecode.h"

static size_t urldecode(char *dest, const char *url, size_t url_len, int decode_plus_sign)
{
    size_t s = 0, d = 0;
    char c;

    while (s < url_len) {
        c = url[s++];

        if (c == '%' && s + 1 < url_len) {
            char c2 = url[s++];
            char c3 = url[s++];
            if (av_isxdigit(c2) && av_isxdigit(c3)) {
                c2 = av_tolower(c2);
                c3 = av_tolower(c3);

                if (c2 <= '9')
                    c2 = c2 - '0';
                else
                    c2 = c2 - 'a' + 10;

                if (c3 <= '9')
                    c3 = c3 - '0';
                else
                    c3 = c3 - 'a' + 10;

                dest[d++] = 16 * c2 + c3;

            } else { /* %zz or something other invalid */
                dest[d++] = c;
                dest[d++] = c2;
                dest[d++] = c3;
            }
        } else if (c == '+' && decode_plus_sign) {
            dest[d++] = ' ';
        } else {
            dest[d++] = c;
        }

    }

    return d;
}

char *ff_urldecode(const char *url, int decode_plus_sign)
{