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Annotation of embedaddon/curl/docs/examples/sftpuploadresume.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
        !             9:  *
        !            10:  * This software is licensed as described in the file COPYING, which
        !            11:  * you should have received as part of this distribution. The terms
        !            12:  * are also available at https://curl.haxx.se/docs/copyright.html.
        !            13:  *
        !            14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
        !            15:  * copies of the Software, and permit persons to whom the Software is
        !            16:  * furnished to do so, under the terms of the COPYING file.
        !            17:  *
        !            18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
        !            19:  * KIND, either express or implied.
        !            20:  *
        !            21:  ***************************************************************************/
        !            22: /* <DESC>
        !            23:  * Upload to SFTP, resuming a previously aborted transfer.
        !            24:  * </DESC>
        !            25:  */
        !            26: 
        !            27: #include <stdlib.h>
        !            28: #include <stdio.h>
        !            29: #include <curl/curl.h>
        !            30: 
        !            31: /* read data to upload */
        !            32: static size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream)
        !            33: {
        !            34:   FILE *f = (FILE *)stream;
        !            35:   size_t n;
        !            36: 
        !            37:   if(ferror(f))
        !            38:     return CURL_READFUNC_ABORT;
        !            39: 
        !            40:   n = fread(ptr, size, nmemb, f) * size;
        !            41: 
        !            42:   return n;
        !            43: }
        !            44: 
        !            45: /*
        !            46:  * sftpGetRemoteFileSize returns the remote file size in byte; -1 on error
        !            47:  */
        !            48: static curl_off_t sftpGetRemoteFileSize(const char *i_remoteFile)
        !            49: {
        !            50:   CURLcode result = CURLE_GOT_NOTHING;
        !            51:   curl_off_t remoteFileSizeByte = -1;
        !            52:   CURL *curlHandlePtr = curl_easy_init();
        !            53: 
        !            54:   curl_easy_setopt(curlHandlePtr, CURLOPT_VERBOSE, 1L);
        !            55: 
        !            56:   curl_easy_setopt(curlHandlePtr, CURLOPT_URL, i_remoteFile);
        !            57:   curl_easy_setopt(curlHandlePtr, CURLOPT_NOPROGRESS, 1);
        !            58:   curl_easy_setopt(curlHandlePtr, CURLOPT_NOBODY, 1);
        !            59:   curl_easy_setopt(curlHandlePtr, CURLOPT_HEADER, 1);
        !            60:   curl_easy_setopt(curlHandlePtr, CURLOPT_FILETIME, 1);
        !            61: 
        !            62:   result = curl_easy_perform(curlHandlePtr);
        !            63:   if(CURLE_OK == result) {
        !            64:     result = curl_easy_getinfo(curlHandlePtr,
        !            65:                                CURLINFO_CONTENT_LENGTH_DOWNLOAD_T,
        !            66:                                &remoteFileSizeByte);
        !            67:     if(result)
        !            68:       return -1;
        !            69:     printf("filesize: %" CURL_FORMAT_CURL_OFF_T "\n", remoteFileSizeByte);
        !            70:   }
        !            71:   curl_easy_cleanup(curlHandlePtr);
        !            72: 
        !            73:   return remoteFileSizeByte;
        !            74: }
        !            75: 
        !            76: 
        !            77: static int sftpResumeUpload(CURL *curlhandle, const char *remotepath,
        !            78:                             const char *localpath)
        !            79: {
        !            80:   FILE *f = NULL;
        !            81:   CURLcode result = CURLE_GOT_NOTHING;
        !            82: 
        !            83:   curl_off_t remoteFileSizeByte = sftpGetRemoteFileSize(remotepath);
        !            84:   if(-1 == remoteFileSizeByte) {
        !            85:     printf("Error reading the remote file size: unable to resume upload\n");
        !            86:     return -1;
        !            87:   }
        !            88: 
        !            89:   f = fopen(localpath, "rb");
        !            90:   if(!f) {
        !            91:     perror(NULL);
        !            92:     return 0;
        !            93:   }
        !            94: 
        !            95:   curl_easy_setopt(curlhandle, CURLOPT_UPLOAD, 1L);
        !            96:   curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);
        !            97:   curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);
        !            98:   curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);
        !            99: 
        !           100: #ifdef _WIN32
        !           101:   _fseeki64(f, remoteFileSizeByte, SEEK_SET);
        !           102: #else
        !           103:   fseek(f, (long)remoteFileSizeByte, SEEK_SET);
        !           104: #endif
        !           105:   curl_easy_setopt(curlhandle, CURLOPT_APPEND, 1L);
        !           106:   result = curl_easy_perform(curlhandle);
        !           107: 
        !           108:   fclose(f);
        !           109: 
        !           110:   if(result == CURLE_OK)
        !           111:     return 1;
        !           112:   else {
        !           113:     fprintf(stderr, "%s\n", curl_easy_strerror(result));
        !           114:     return 0;
        !           115:   }
        !           116: }
        !           117: 
        !           118: int main(void)
        !           119: {
        !           120:   const char *remote = "sftp://user:pass@example.com/path/filename";
        !           121:   const char *filename = "filename";
        !           122:   CURL *curlhandle = NULL;
        !           123: 
        !           124:   curl_global_init(CURL_GLOBAL_ALL);
        !           125:   curlhandle = curl_easy_init();
        !           126: 
        !           127:   if(!sftpResumeUpload(curlhandle, remote, filename)) {
        !           128:     printf("resumed upload using curl %s failed\n", curl_version());
        !           129:   }
        !           130: 
        !           131:   curl_easy_cleanup(curlhandle);
        !           132:   curl_global_cleanup();
        !           133: 
        !           134:   return 0;
        !           135: }