115 lines
3.8 KiB
Groff
115 lines
3.8 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_CHUNK_BGN_FUNCTION 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_CHUNK_BGN_FUNCTION \- callback before a transfer with FTP wildcardmatch
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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long chunk_bgn_callback(const void *transfer_info, void *ptr,
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int remains);
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CHUNK_BGN_FUNCTION,
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chunk_bgn_callback);
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.SH DESCRIPTION
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Pass a pointer to your callback function, which should match the prototype
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shown above.
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This callback function gets called by libcurl before a part of the stream is
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going to be transferred (if the transfer supports chunks).
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The \fItransfer_info\fP pointer will point to a struct curl_fileinfo with
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details about the file that is about to get transferred.
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This callback makes sense only when using the \fICURLOPT_WILDCARDMATCH(3)\fP
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option for now.
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The target of transfer_info parameter is a "feature depended" structure. For
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the FTP wildcard download, the target is curl_fileinfo structure (see
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\fIcurl/curl.h\fP). The parameter \fIptr\fP is a pointer given by
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\fICURLOPT_CHUNK_DATA(3)\fP. The parameter remains contains number of chunks
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remaining per the transfer. If the feature is not available, the parameter has
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zero value.
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Return \fICURL_CHUNK_BGN_FUNC_OK\fP if everything is fine,
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\fICURL_CHUNK_BGN_FUNC_SKIP\fP if you want to skip the concrete chunk or
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\fICURL_CHUNK_BGN_FUNC_FAIL\fP to tell libcurl to stop if some error occurred.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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FTP
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.SH EXAMPLE
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.nf
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static long file_is_coming(struct curl_fileinfo *finfo,
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struct callback_data *data,
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int remains)
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{
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printf("%3d %40s %10luB ", remains, finfo->filename,
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(unsigned long)finfo->size);
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switch(finfo->filetype) {
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case CURLFILETYPE_DIRECTORY:
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printf(" DIR\\n");
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break;
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case CURLFILETYPE_FILE:
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printf("FILE ");
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break;
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default:
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printf("OTHER\\n");
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break;
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}
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if(finfo->filetype == CURLFILETYPE_FILE) {
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/* do not transfer files >= 50B */
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if(finfo->size > 50) {
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printf("SKIPPED\\n");
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return CURL_CHUNK_BGN_FUNC_SKIP;
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}
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data->output = fopen(finfo->filename, "wb");
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if(!data->output) {
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return CURL_CHUNK_BGN_FUNC_FAIL;
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}
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}
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return CURL_CHUNK_BGN_FUNC_OK;
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}
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int main()
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{
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/* data for callback */
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struct callback_data callback_info;
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/* callback is called before download of concrete file started */
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curl_easy_setopt(curl, CURLOPT_CHUNK_BGN_FUNCTION, file_is_coming);
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curl_easy_setopt(curl, CURLOPT_CHUNK_DATA, &callback_info);
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}
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.fi
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.SH AVAILABILITY
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This was added in 7.21.0
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_CHUNK_END_FUNCTION "(3), " CURLOPT_WILDCARDMATCH "(3), "
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