CURLOPT_CHUNK_DATA(3)

1CURLOPT_CHUNK_DATA(3)      curl_easy_setopt options      CURLOPT_CHUNK_DATA(3)
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NAME

6       CURLOPT_CHUNK_DATA - custom pointer to the FTP chunk callbacks
7

SYNOPSIS

9       #include <curl/curl.h>
10
11       CURLcode   curl_easy_setopt(CURL   *handle,   CURLOPT_CHUNK_DATA,  void
12       *pointer);
13

DESCRIPTION

15       Pass a pointer that will be untouched by libcurl and passed as the  ptr
16       argument     to     the    CURLOPT_CHUNK_BGN_FUNCTION(3)    and    CUR‐
17       LOPT_CHUNK_END_FUNCTION(3).
18

DEFAULT

20       NULL
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PROTOCOLS

23       FTP
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EXAMPLE

26       static long file_is_coming(struct curl_fileinfo *finfo,
27                                  struct callback_data *data,
28                                  int remains)
29       {
30         printf("%3d %40s %10luB ", remains, finfo->filename,
31                (unsigned long)finfo->size);
32
33         switch(finfo->filetype) {
34         case CURLFILETYPE_DIRECTORY:
35           printf(" DIR\n");
36           break;
37         case CURLFILETYPE_FILE:
38           printf("FILE ");
39           break;
40         default:
41           printf("OTHER\n");
42           break;
43         }
44
45         if(finfo->filetype == CURLFILETYPE_FILE) {
46           /* do not transfer files >= 50B */
47           if(finfo->size > 50) {
48             printf("SKIPPED\n");
49             return CURL_CHUNK_BGN_FUNC_SKIP;
50           }
51
52           data->output = fopen(finfo->filename, "wb");
53           if(!data->output) {
54             return CURL_CHUNK_BGN_FUNC_FAIL;
55           }
56         }
57
58         return CURL_CHUNK_BGN_FUNC_OK;
59       }
60
61       int main()
62       {
63         /* data for callback */
64         struct callback_data callback_info;
65
66         /* callback is called before download of concrete file started */
67         curl_easy_setopt(curl, CURLOPT_CHUNK_BGN_FUNCTION, file_is_coming);
68         curl_easy_setopt(curl, CURLOPT_CHUNK_DATA, &callback_info);
69       }
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AVAILABILITY

72       Added in 7.21.0
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RETURN VALUE

75       Returns CURLE_OK if the option is supported,  and  CURLE_UNKNOWN_OPTION
76       if not.
77