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curl/docs/libcurl/opts/CURLOPT_CHUNK_BGN_FUNCTION.3
Daniel Stenberg 28f38da506
CURLOPT_CHUNK_BGN_FUNCTION.3: document the struct and time value
The time field in the curl_fileinfo struct will always be zero. No code
was ever implemented to actually convert the date string to a time_t.

Fixes #3829
Closes #3835
2019-05-03 23:19:56 +02:00

142 lines
4.4 KiB
Groff

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.TH CURLOPT_CHUNK_BGN_FUNCTION 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_CHUNK_BGN_FUNCTION \- callback before a transfer with FTP wildcardmatch
.SH SYNOPSIS
.nf
#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);
.SH DESCRIPTION
Pass a pointer to your callback function, which should match the prototype
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 \fItransfer_info\fP pointer will point to a struct curl_fileinfo with
details about the file that is about to get transferred.
This callback makes sense only when using the \fICURLOPT_WILDCARDMATCH(3)\fP
option for now.
The target of transfer_info parameter is a "feature depended" structure. For
the FTP wildcard download, the target is curl_fileinfo structure (see
\fIcurl/curl.h\fP). The parameter \fIptr\fP is a pointer given by
\fICURLOPT_CHUNK_DATA(3)\fP. The parameter remains contains number of chunks
remaining per the transfer. If the feature is not available, the parameter has
zero value.
Return \fICURL_CHUNK_BGN_FUNC_OK\fP if everything is fine,
\fICURL_CHUNK_BGN_FUNC_SKIP\fP if you want to skip the concrete chunk or
\fICURL_CHUNK_BGN_FUNC_FAIL\fP to tell libcurl to stop if some error occurred.
.SH DEFAULT
NULL
.SH PROTOCOLS
FTP
.SH EXAMPLE
.nf
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);
}
.fi
.SH AVAILABILITY
This was added in 7.21.0
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLOPT_CHUNK_END_FUNCTION "(3), " CURLOPT_WILDCARDMATCH "(3), "