http.c

#include "http.h"
#include "utils.h"
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

#define BUFFER_SIZE 104857600

void build_http_response(const char *file_name, const char *file_ext, char *response, size_t *response_len) {
    const char *mime_type = get_mime_type(file_ext);
    char header[256];

    snprintf(header, sizeof(header),
             "HTTP/1.1 200 OK\r\n"
             "Content-Type: %s\r\n"
             "\r\n",
             mime_type);

    int file_fd = open(file_name, O_RDONLY);
    if (file_fd == -1) {
        snprintf(response, BUFFER_SIZE,
                 "HTTP/1.1 404 Not Found\r\n"
                 "Content-Type: text/plain\r\n"
                 "\r\n"
                 "404 Not Found");
        *response_len = strlen(response);
        return;
    }

    struct stat file_stat;
    fstat(file_fd, &file_stat);

    *response_len = 0;
    memcpy(response, header, strlen(header));
    *response_len += strlen(header);

    ssize_t bytes_read;
    while ((bytes_read = read(file_fd, response + *response_len, BUFFER_SIZE - *response_len)) > 0) {
        *response_len += bytes_read;
    }

    close(file_fd);
}