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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_CHUNK_DATA 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_CHUNK_DATA \- custom pointer to the FTP chunk callbacks
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CHUNK_DATA, void *pointer);
+.SH DESCRIPTION
+Pass a \fIpointer\fP that will be untouched by libcurl and passed as the ptr
+argument to the \fICURLOPT_CHUNK_BGN_FUNCTION(3)\fP and
+\fICURLOPT_CHUNK_END_FUNCTION(3)\fP.
+.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
+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_BGN_FUNCTION "(3), " CURLOPT_WILDCARDMATCH "(3), "