Tribblix: manual page: CURLOPT_CHUNK

CURLOPT_CHUNK_DATA(3) Introduction to Library Functions

NAME

CURLOPT_CHUNK_DATA - pointer passed to the FTP chunk callbacks

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CHUNK_DATA, void *pointer);

DESCRIPTION

Pass a pointer that is untouched by libcurl and passed as the ptr
argument to the CURLOPT_CHUNK_BGN_FUNCTION(3) and
CURLOPT_CHUNK_END_FUNCTION(3).

DEFAULT

NULL

PROTOCOLS

This functionality affects ftp only

EXAMPLE

#include <stdio.h>

struct callback_data {
FILE *output;
};

static long file_is_coming(struct curl_fileinfo *finfo,
void *ptr,
int remains)
{
struct callback_data *data = ptr;
printf("%3d %40s %10luB ", remains, finfo->filename,
(unsigned long)finfo->size);

switch(finfo->filetype) {
case CURLFILETYPE_DIRECTORY:
printf(" DIR\n");
break;
case CURLFILETYPE_FILE:
printf("FILE ");
break;
default:
printf("OTHER\n");
break;
}

if(finfo->filetype == CURLFILETYPE_FILE) {
/* do not transfer files >= 50B */
if(finfo->size > 50) {
printf("SKIPPED\n");
return CURL_CHUNK_BGN_FUNC_SKIP;
}

data->output = fopen(finfo->filename, "wb");
if(!data->output) {
return CURL_CHUNK_BGN_FUNC_FAIL;
}
}

return CURL_CHUNK_BGN_FUNC_OK;
}

int main()
{
/* data for callback */
struct callback_data callback_info;

CURL *curl = curl_easy_init();

/* callback is called before download of concrete file started */
curl_easy_setopt(curl, CURLOPT_CHUNK_BGN_FUNCTION, file_is_coming);
curl_easy_setopt(curl, CURLOPT_CHUNK_DATA, &callback_info);
}

AVAILABILITY

Added in curl 7.21.0

RETURN VALUE

curl_easy_setopt(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error
occurred, see libcurl-errors(3).