file.c

#include "file.h"
#include "compare.h"
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

const char *get_file_extension(const char *file_name) {
    const char *dot = strrchr(file_name, '.');
    if (!dot || dot == file_name) {
        return "";
    }
    return dot + 1;
}

char *get_file_case_insensitive(const char *file_name) {
    DIR *dir = opendir(".");
    if (dir == NULL) {
        perror("opendir");
        return NULL;
    }

    struct dirent *entry;
    char *found_file_name = NULL;
    while ((entry = readdir(dir)) != NULL) {
        if (case_insensitive_compare(entry->d_name, file_name)) {
            found_file_name = entry->d_name;
            break;
        }
    }

    closedir(dir);
    return found_file_name;
}

char *decode_url(const char *src) {
    size_t src_len = strlen(src);
    char *decoded = malloc(src_len + 1);
    size_t decoded_len = 0;

    // decode %2x to hex
    for (size_t i = 0; i < src_len; i++) {
        if (src[i] == '%' && i + 2 < src_len) {
            int hex_val;
            sscanf(src + i + 1, "%2x", &hex_val);
            decoded[decoded_len++] = hex_val;
            i += 2;
        } else {
            decoded[decoded_len++] = src[i];
        }
    }

    // add null terminator
    decoded[decoded_len] = '\0';
    return decoded;
}