CURLOPT_MAXFILESIZE_LARGE - Man Page

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAXFILESIZE_LARGE,
                          curl_off_t size);

Pass a curl_off_t as parameter. This specifies the maximum accepted size (in bytes) of a file to download. If the file requested is found larger than this value, the transfer is aborted and CURLE_FILESIZE_EXCEEDED is returned. Passing a zero size disables this, and passing a negative size yields a CURLE_BAD_FUNCTION_ARGUMENT.

The file size is not always known prior to the download start, and for such transfers this option has no effect - even if the file transfer eventually ends up being larger than this given limit.

Since 8.4.0, this option also stops ongoing transfers if they reach this threshold.

0, meaning disabled.

This functionality affects ftp, http and mqtt

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode ret;
    curl_off_t ridiculous = (curl_off_t)1 << 48;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    /* refuse to download if larger than ridiculous */
    curl_easy_setopt(curl, CURLOPT_MAXFILESIZE_LARGE, ridiculous);
    ret = curl_easy_perform(curl);
  }
}

Added in curl 7.11.0

Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_BAD_FUNCTION_ARGUMENT if the size passed is invalid.

CURLOPT_MAXFILESIZE(3), CURLOPT_MAX_RECV_SPEED_LARGE(3)

curl_easy_setopt(3), CURLOPT_IGNORE_CONTENT_LENGTH(3), CURLOPT_MAXFILESIZE(3), CURLOPT_RANGE(3), libcurl-security(3), libcurl-symbols(3).