CURLOPT_CHUNK_BGN_FUNCTION(curl_easy_setopt optioCURLOPT_CHUNK_BGN_FUNCTION(3)
NAME
CURLOPT_CHUNK_BGN_FUNCTION - callback before a transfer with FTP wild-
cardmatch
SYNOPSIS
#include <curl/curl.h>
struct curl_fileinfo {
char *filename;
curlfiletype filetype;
time_t time; /* always zero! */
unsigned int perm;
int uid;
int gid;
curl_off_t size;
long int hardlinks;
struct {
/* If some of these fields is not NULL, it is a pointer to b_data. */
char *time;
char *perm;
char *user;
char *group;
char *target; /* pointer to the target filename of a symlink */
} strings;
unsigned int flags;
/* used internally */
char *b_data;
size_t b_size;
size_t b_used;
};
long chunk_bgn_callback(const void *transfer_info, void *ptr,
int remains);
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CHUNK_BGN_FUNCTION,
chunk_bgn_callback);
DESCRIPTION
Pass a pointer to your callback function, which should match the proto-
type shown above.
This callback function gets called by libcurl before a part of the
stream is going to be transferred (if the transfer supports chunks).
The transfer_info pointer will point to a struct curl_fileinfo with de-
tails about the file that is about to get transferred.
This callback makes sense only when using the CURLOPT_WILDCARDMATCH(3)
option for now.
The target of transfer_info parameter is a "feature depended" struc-
ture. For the FTP wildcard download, the target is curl_fileinfo struc-
ture (see curl/curl.h). The parameter ptr is a pointer given by CUR-
LOPT_CHUNK_DATA(3). The parameter remains contains number of chunks re-
maining per the transfer. If the feature is not available, the parame-
ter has zero value.
Return CURL_CHUNK_BGN_FUNC_OK if everything is fine,
CURL_CHUNK_BGN_FUNC_SKIP if you want to skip the concrete chunk or
CURL_CHUNK_BGN_FUNC_FAIL to tell libcurl to stop if some error oc-
curred.
DEFAULT
NULL
PROTOCOLS
FTP
EXAMPLE
static long file_is_coming(struct curl_fileinfo *finfo,
struct callback_data *data,
int remains)
{
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;
/* 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
This was added in 7.21.0
RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
if not.
SEE ALSO
CURLOPT_CHUNK_END_FUNCTION(3), CURLOPT_WILDCARDMATCH(3),
libcurl 7.81.0 November 04, 2020 CURLOPT_CHUNK_BGN_FUNCTION(3)
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