quickjs-tart

quickjs-based runtime for wallet-core logic
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CURLOPT_UPLOAD.md (2554B)

      1 ---
      2 c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
      3 SPDX-License-Identifier: curl
      4 Title: CURLOPT_UPLOAD
      5 Section: 3
      6 Source: libcurl
      7 See-also:
      8   - CURLOPT_INFILESIZE_LARGE (3)
      9   - CURLOPT_PUT (3)
     10   - CURLOPT_READFUNCTION (3)
     11 Protocol:
     12   - All
     13 Added-in: 7.1
     14 ---
     15 
     16 # NAME
     17 
     18 CURLOPT_UPLOAD - data upload
     19 
     20 # SYNOPSIS
     21 
     22 ~~~c
     23 #include <curl/curl.h>
     24 
     25 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UPLOAD, long upload);
     26 ~~~
     27 
     28 # DESCRIPTION
     29 
     30 The long parameter *upload* set to 1 tells the library to prepare for and
     31 perform an upload. The CURLOPT_READDATA(3) and CURLOPT_INFILESIZE(3) or
     32 CURLOPT_INFILESIZE_LARGE(3) options are also interesting for uploads. If the
     33 protocol is HTTP, uploading means using the PUT request unless you tell
     34 libcurl otherwise.
     35 
     36 Using PUT with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
     37 You can disable this header with CURLOPT_HTTPHEADER(3) as usual.
     38 
     39 If you use PUT to an HTTP 1.1 server, you can upload data without knowing the
     40 size before starting the transfer. The library enables this by adding a header
     41 "Transfer-Encoding: chunked". With HTTP 1.0 or if you prefer not to use
     42 chunked transfer, you must specify the size of the data with
     43 CURLOPT_INFILESIZE(3) or CURLOPT_INFILESIZE_LARGE(3).
     44 
     45 # DEFAULT
     46 
     47 0
     48 
     49 # %PROTOCOLS%
     50 
     51 # EXAMPLE
     52 
     53 ~~~c
     54 static size_t read_cb(char *ptr, size_t size, size_t nmemb, void *userdata)
     55 {
     56   FILE *src = userdata;
     57   /* copy as much data as possible into the 'ptr' buffer, but no more than
     58      'size' * 'nmemb' bytes */
     59   size_t retcode = fread(ptr, size, nmemb, src);
     60 
     61   return retcode;
     62 }
     63 
     64 int main(void)
     65 {
     66   CURL *curl = curl_easy_init();
     67   if(curl) {
     68     FILE *src = fopen("local-file", "r");
     69     curl_off_t fsize = 1234; /* set this to the size of the input file */
     70 
     71     /* we want to use our own read function */
     72     curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_cb);
     73 
     74     /* enable uploading */
     75     curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
     76 
     77     /* specify target */
     78     curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/dir/to/newfile");
     79 
     80     /* now specify which pointer to pass to our callback */
     81     curl_easy_setopt(curl, CURLOPT_READDATA, src);
     82 
     83     /* Set the size of the file to upload */
     84     curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)fsize);
     85 
     86     /* Now run off and do what you have been told */
     87     curl_easy_perform(curl);
     88   }
     89 }
     90 ~~~
     91 
     92 # %AVAILABILITY%
     93 
     94 # RETURN VALUE
     95 
     96 curl_easy_setopt(3) returns a CURLcode indicating success or error.
     97 
     98 CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
     99 libcurl-errors(3).