The new ftpuploadresume.c example by Philip Bock

diff --git a/docs/examples/Makefile.am b/docs/examples/Makefile.am
index c09183b..61a6770 100644 (file)
--- a/docs/examples/Makefile.am
+++ b/docs/examples/Makefile.am
@@ -11,7 +11,7 @@ EXTRA_DIST = README curlgtk.c sepheaders.c simple.c postit2.c         \
  multi-post.c fopen.c simplepost.c makefile.dj curlx.c https.c         \
  multi-debugcallback.c fileupload.c getinfo.c ftp3rdparty.c debug.c    \
  anyauthput.c htmltitle.cc htmltidy.c opensslthreadlock.c              \
- cookie_interface.c cacertinmem.c synctime.c sampleconv.c
+ cookie_interface.c cacertinmem.c synctime.c sampleconv.c ftpuploadresume.c
 
 all:
        @echo "done"

diff --git a/docs/examples/ftpuploadresume.c b/docs/examples/ftpuploadresume.c
new file mode 100644 (file)
index 0000000..f83cd0a
--- /dev/null
+++ b/docs/examples/ftpuploadresume.c
@@ -0,0 +1,154 @@
+/*****************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * $Id$
+ *
+ * Upload to FTP, resuming failed transfers
+ *
+ * Compile for MinGW like this:
+ *  gcc -Wall -pedantic -std=c99 ftpuploadwithresume.c -o ftpuploadresume.exe
+ *  -lcurl -lmsvcr70
+ *
+ * Written by Philip Bock
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <curl/curl.h>
+
+
+/* The MinGW headers are missing a few Win32 function definitions,
+   you shouldn't need this if you use VC++ */
+int __cdecl _snscanf(const char * input, size_t length, const char * format, ...);
+
+
+/* parse headers for Content-Length */
+size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb, void *stream) {
+       int r;
+       long len = 0;
+
+       /* _snscanf() is Win32 specific */
+       r = _snscanf(ptr, size * nmemb, "Content-Length: %ld\n", &len);
+
+       if (r) /* Microsoft: we don't read the specs */
+               *((long *) stream) = len;
+
+       return size * nmemb;
+}
+
+/* discard downloaded data */
+size_t discardfunc(void *ptr, size_t size, size_t nmemb, void *stream) {
+       return size * nmemb;
+}
+
+/* read data to upload */
+size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream)
+{
+       FILE *f = stream;
+       size_t n;
+
+       if (ferror(f))
+               return CURL_READFUNC_ABORT;
+
+       n = fread(ptr, size, nmemb, f) * size;
+
+       return n;
+}
+
+
+int upload(CURL *curlhandle, const char * remotepath, const char * localpath,
+           long timeout, long tries)
+{
+       FILE *f;
+       long uploaded_len = 0;
+       CURLcode r = CURLE_GOT_NOTHING;
+       int c;
+
+       f = fopen(localpath, "rb");
+       if (f == NULL) {
+               perror(NULL);
+               return 0;
+       }
+
+       curl_easy_setopt(curlhandle, CURLOPT_UPLOAD, TRUE);
+
+       curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);
+
+       if (timeout)
+               curl_easy_setopt(curlhandle, CURLOPT_FTP_RESPONSE_TIMEOUT, timeout);
+
+       curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);
+       curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &uploaded_len);
+
+       curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, discardfunc);
+
+       curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);
+       curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);
+
+       curl_easy_setopt(curlhandle, CURLOPT_FTPPORT, "-"); /* disable passive mode */
+       curl_easy_setopt(curlhandle, CURLOPT_FTP_CREATE_MISSING_DIRS, TRUE);
+
+       curl_easy_setopt(curlhandle, CURLOPT_VERBOSE, TRUE);
+
+       for (c = 0; (r != CURLE_OK) && (c < tries); c++) {
+               /* are we resuming? */
+               if (c) { /* yes */
+                       /* determine the length of the file already written */
+
+                       /*
+                        * With NOBODY and NOHEADER, libcurl will issue a SIZE
+                        * command, but the only way to retrieve the result is
+                        * to parse the returned Content-Length header. Thus,
+                        * getcontentlengthfunc(). We need discardfunc() above
+                        * because HEADER will dump the headers to stdout
+                        * without it.
+                        */
+                       curl_easy_setopt(curlhandle, CURLOPT_NOBODY, TRUE);
+                       curl_easy_setopt(curlhandle, CURLOPT_HEADER, TRUE);
+
+                       r = curl_easy_perform(curlhandle);
+                       if (r != CURLE_OK)
+                               continue;
+
+                       curl_easy_setopt(curlhandle, CURLOPT_NOBODY, FALSE);
+                       curl_easy_setopt(curlhandle, CURLOPT_HEADER, FALSE);
+
+                       fseek(f, uploaded_len, SEEK_SET);
+
+                       curl_easy_setopt(curlhandle, CURLOPT_FTPAPPEND, TRUE);
+               }
+               else { /* no */
+                       curl_easy_setopt(curlhandle, CURLOPT_FTPAPPEND, FALSE);
+               }
+
+               r = curl_easy_perform(curlhandle);
+       }
+
+       fclose(f);
+
+       if (r == CURLE_OK)
+               return 1;
+       else {
+               fprintf(stderr, "%s\n", curl_easy_strerror(r));
+               return 0;
+       }
+}
+
+int main(int c, char **argv) {
+       CURL *curlhandle = NULL;
+
+       curl_global_init(CURL_GLOBAL_ALL);
+       curlhandle = curl_easy_init();
+
+       upload(curlhandle, "ftp://user:pass@host/path/file", "C:\\file", 0, 3);
+
+       curl_easy_cleanup(curlhandle);
+       curl_global_cleanup();
+
+       return 0;
+}