http.c

        data->set.infilesize -= data->reqdata.resume_from;

        if(data->set.infilesize <= 0) {
          failf(data, "File already completely uploaded");
          return CURLE_PARTIAL_FILE;
        }
      }
      /* we've passed, proceed as normal */
    }
  }
  if(data->reqdata.use_range) {
    /*
     * A range is selected. We use different headers whether we're downloading
     * or uploading and we always let customized headers override our internal
     * ones if any such are specified.
     */
    if((httpreq == HTTPREQ_GET) &&
       !checkheaders(data, "Range:")) {
      /* if a line like this was already allocated, free the previous one */
      if(conn->allocptr.rangeline)
        free(conn->allocptr.rangeline);
      conn->allocptr.rangeline = aprintf("Range: bytes=%s\r\n", data->reqdata.range);
    }
    else if((httpreq != HTTPREQ_GET) &&
            !checkheaders(data, "Content-Range:")) {

      if(data->reqdata.resume_from) {
        /* This is because "resume" was selected */
        curl_off_t total_expected_size=
          data->reqdata.resume_from + data->set.infilesize;
        conn->allocptr.rangeline =
            aprintf("Content-Range: bytes %s%" FORMAT_OFF_T
                    "/%" FORMAT_OFF_T "\r\n",
                    data->reqdata.range, total_expected_size-1,
                    total_expected_size);
      }
      else {
        /* Range was selected and then we just pass the incoming range and
           append total size */
        conn->allocptr.rangeline =
            aprintf("Content-Range: bytes %s/%" FORMAT_OFF_T "\r\n",
                    data->reqdata.range, data->set.infilesize);
      }
    }
  }

  {
    /* Use 1.1 unless the use specificly asked for 1.0 */
    const char *httpstring=
      data->set.httpversion==CURL_HTTP_VERSION_1_0?"1.0":"1.1";

    send_buffer *req_buffer;
    curl_off_t postsize; /* off_t type to be able to hold a large file size */

    /* initialize a dynamic send-buffer */
    req_buffer = add_buffer_init();

    if(!req_buffer)
      return CURLE_OUT_OF_MEMORY;

    /* add the main request stuff */
    result =
      add_bufferf(req_buffer,
                  "%s " /* GET/HEAD/POST/PUT */
                  "%s HTTP/%s\r\n" /* path + HTTP version */
                  "%s" /* proxyuserpwd */
                  "%s" /* userpwd */
                  "%s" /* range */
                  "%s" /* user agent */
                  "%s" /* host */
                  "%s" /* pragma */
                  "%s" /* accept */
                  "%s" /* accept-encoding */
                  "%s" /* referer */
                  "%s" /* Proxy-Connection */
                  "%s",/* transfer-encoding */

                request,
                ppath,
                httpstring,
                conn->allocptr.proxyuserpwd?
                conn->allocptr.proxyuserpwd:"",
                conn->allocptr.userpwd?conn->allocptr.userpwd:"",
                (data->reqdata.use_range && conn->allocptr.rangeline)?
                conn->allocptr.rangeline:"",
                (data->set.useragent && *data->set.useragent && conn->allocptr.uagent)?
                conn->allocptr.uagent:"",
                (conn->allocptr.host?conn->allocptr.host:""), /* Host: host */
                http->p_pragma?http->p_pragma:"",
                http->p_accept?http->p_accept:"",
                (data->set.encoding && *data->set.encoding && conn->allocptr.accept_encoding)?
                conn->allocptr.accept_encoding:"",
                (data->change.referer && conn->allocptr.ref)?conn->allocptr.ref:"" /* Referer: <data> */,
                (conn->bits.httpproxy &&
                 !conn->bits.tunnel_proxy &&
                 !checkheaders(data, "Proxy-Connection:"))?
                  "Proxy-Connection: Keep-Alive\r\n":"",
                te
                );

    if(result)
      return result;

#if !defined(CURL_DISABLE_COOKIES)
    if(data->cookies || addcookies) {
      struct Cookie *co=NULL; /* no cookies from start */
      int count=0;

      if(data->cookies) {
        Curl_share_lock(data, CURL_LOCK_DATA_COOKIE, CURL_LOCK_ACCESS_SINGLE);
        co = Curl_cookie_getlist(data->cookies,
                                 conn->allocptr.cookiehost?
                                 conn->allocptr.cookiehost:host, data->reqdata.path,
                                 (bool)(conn->protocol&PROT_HTTPS?TRUE:FALSE));
        Curl_share_unlock(data, CURL_LOCK_DATA_COOKIE);
      }
      if(co) {
        struct Cookie *store=co;
        /* now loop through all cookies that matched */
        while(co) {
          if(co->value) {
            if(0 == count) {
              result = add_bufferf(req_buffer, "Cookie: ");
              if(result)
                break;
            }
            result = add_bufferf(req_buffer,
                                 "%s%s=%s", count?"; ":"",
                                 co->name, co->value);
            if(result)
              break;
            count++;
          }
          co = co->next; /* next cookie please */
        }
        Curl_cookie_freelist(store); /* free the cookie list */
      }
      if(addcookies && (CURLE_OK == result)) {
        if(!count)
          result = add_bufferf(req_buffer, "Cookie: ");
        if(CURLE_OK == result) {
          result = add_bufferf(req_buffer, "%s%s",
                               count?"; ":"",
                               addcookies);
          count++;
        }
      }
      if(count && (CURLE_OK == result))
        result = add_buffer(req_buffer, "\r\n", 2);

      if(result)
        return result;
    }
#endif

    if(data->set.timecondition) {
      struct tm *tm;

      /* Phil Karn (Fri, 13 Apr 2001) pointed out that the If-Modified-Since
       * header family should have their times set in GMT as RFC2616 defines:
       * "All HTTP date/time stamps MUST be represented in Greenwich Mean Time
       * (GMT), without exception. For the purposes of HTTP, GMT is exactly
       * equal to UTC (Coordinated Universal Time)." (see page 20 of RFC2616).
       */

#ifdef HAVE_GMTIME_R
      /* thread-safe version */
      struct tm keeptime;
      tm = (struct tm *)gmtime_r(&data->set.timevalue, &keeptime);
#else
      tm = gmtime(&data->set.timevalue);
#endif

      /* format: "Tue, 15 Nov 1994 12:45:26 GMT" */
      snprintf(buf, BUFSIZE-1,
               "%s, %02d %s %4d %02d:%02d:%02d GMT",
               Curl_wkday[tm->tm_wday?tm->tm_wday-1:6],
               tm->tm_mday,
               Curl_month[tm->tm_mon],
               tm->tm_year + 1900,
               tm->tm_hour,
               tm->tm_min,
               tm->tm_sec);

      switch(data->set.timecondition) {
      case CURL_TIMECOND_IFMODSINCE:
      default:
        result = add_bufferf(req_buffer,
                             "If-Modified-Since: %s\r\n", buf);
        break;
      case CURL_TIMECOND_IFUNMODSINCE:
        result = add_bufferf(req_buffer,
                             "If-Unmodified-Since: %s\r\n", buf);
        break;
      case CURL_TIMECOND_LASTMOD:
        result = add_bufferf(req_buffer,
                             "Last-Modified: %s\r\n", buf);
        break;
      }
      if(result)
        return result;
    }

    result = add_custom_headers(conn, req_buffer);
    if(result)
      return result;

    http->postdata = NULL;  /* nothing to post at this point */
    Curl_pgrsSetUploadSize(data, 0); /* upload size is 0 atm */

    /* If 'authdone' is FALSE, we must not set the write socket index to the
       Curl_transfer() call below, as we're not ready to actually upload any
       data yet. */

    switch(httpreq) {

    case HTTPREQ_POST_FORM:
      if(!http->sendit || conn->bits.authneg) {
        /* nothing to post! */
        result = add_bufferf(req_buffer, "Content-Length: 0\r\n\r\n");
        if(result)
          return result;

        result = add_buffer_send(req_buffer, conn,
                                 &data->info.request_size, 0, FIRSTSOCKET);
        if(result)
          failf(data, "Failed sending POST request");
        else
          /* setup variables for the upcoming transfer */
          result = Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
                                       &http->readbytecount,
                                       -1, NULL);
        break;
      }

      if(Curl_FormInit(&http->form, http->sendit)) {
        failf(data, "Internal HTTP POST error!");
        return CURLE_HTTP_POST_ERROR;
      }

      /* set the read function to read from the generated form data */
      conn->fread = (curl_read_callback)Curl_FormReader;
      conn->fread_in = &http->form;

      http->sending = HTTPSEND_BODY;

      if(!conn->bits.upload_chunky) {
        /* only add Content-Length if not uploading chunked */
        result = add_bufferf(req_buffer,
                             "Content-Length: %" FORMAT_OFF_T "\r\n",
                             http->postsize);
        if(result)
          return result;
      }

      result = expect100(data, req_buffer);
      if(result)
        return result;

      {

        /* Get Content-Type: line from Curl_formpostheader.
        */
        char *contentType;
        size_t linelength=0;
        contentType = Curl_formpostheader((void *)&http->form,
                                          &linelength);
        if(!contentType) {
          failf(data, "Could not get Content-Type header line!");
          return CURLE_HTTP_POST_ERROR;
        }

        result = add_buffer(req_buffer, contentType, linelength);
        if(result)
          return result;
      }

      /* make the request end in a true CRLF */
      result = add_buffer(req_buffer, "\r\n", 2);
      if(result)
        return result;

      /* set upload size to the progress meter */
      Curl_pgrsSetUploadSize(data, http->postsize);

      /* fire away the whole request to the server */
      result = add_buffer_send(req_buffer, conn,
                               &data->info.request_size, 0, FIRSTSOCKET);
      if(result)
        failf(data, "Failed sending POST request");
      else
        /* setup variables for the upcoming transfer */
        result = Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
                                     &http->readbytecount,
                                     FIRSTSOCKET,
                                     &http->writebytecount);

      if(result) {
        Curl_formclean(&http->sendit); /* free that whole lot */
        return result;
      }
#ifdef CURL_DOES_CONVERSIONS
/* time to convert the form data... */
      result = Curl_formconvert(data, http->sendit);
      if(result) {
        Curl_formclean(&http->sendit); /* free that whole lot */
        return result;
      }
#endif /* CURL_DOES_CONVERSIONS */
      break;

    case HTTPREQ_PUT: /* Let's PUT the data to the server! */

      if(conn->bits.authneg)
        postsize = 0;
      else
        postsize = data->set.infilesize;

      if((postsize != -1) && !conn->bits.upload_chunky) {
        /* only add Content-Length if not uploading chunked */
        result = add_bufferf(req_buffer,
                             "Content-Length: %" FORMAT_OFF_T "\r\n",
                             postsize );
        if(result)
          return result;
      }

      result = expect100(data, req_buffer);
      if(result)
        return result;

      result = add_buffer(req_buffer, "\r\n", 2); /* end of headers */
      if(result)
        return result;

      /* set the upload size to the progress meter */
      Curl_pgrsSetUploadSize(data, postsize);

      /* this sends the buffer and frees all the buffer resources */
      result = add_buffer_send(req_buffer, conn,
                               &data->info.request_size, 0, FIRSTSOCKET);
      if(result)
        failf(data, "Failed sending PUT request");
      else
        /* prepare for transfer */
        result = Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
                                     &http->readbytecount,
                                     postsize?FIRSTSOCKET:-1,
                                     postsize?&http->writebytecount:NULL);
      if(result)
        return result;
      break;

    case HTTPREQ_POST:
      /* this is the simple POST, using x-www-form-urlencoded style */

      if(conn->bits.authneg)
        postsize = 0;
      else
        /* figure out the size of the postfields */
        postsize = (data->set.postfieldsize != -1)?
          data->set.postfieldsize:
          (data->set.postfields?(curl_off_t)strlen(data->set.postfields):0);

      if(!conn->bits.upload_chunky) {
        /* We only set Content-Length and allow a custom Content-Length if
           we don't upload data chunked, as RFC2616 forbids us to set both
           kinds of headers (Transfer-Encoding: chunked and Content-Length) */

        if(!checkheaders(data, "Content-Length:")) {
          /* we allow replacing this header, although it isn't very wise to
             actually set your own */
          result = add_bufferf(req_buffer,
                               "Content-Length: %" FORMAT_OFF_T"\r\n",
                               postsize);
          if(result)
            return result;
        }
      }

      if(!checkheaders(data, "Content-Type:")) {
        result = add_bufferf(req_buffer,
                             "Content-Type: application/x-www-form-urlencoded\r\n");
        if(result)
          return result;
      }

      if(data->set.postfields) {

        /* for really small posts we don't use Expect: headers at all, and for
           the somewhat bigger ones we allow the app to disable it */
        if(postsize > TINY_INITIAL_POST_SIZE) {
          result = expect100(data, req_buffer);
          if(result)
            return result;
        }
        else
          data->state.expect100header = FALSE;

        if(!data->state.expect100header &&
           (postsize < MAX_INITIAL_POST_SIZE))  {
          /* if we don't use expect:-100  AND
             postsize is less than MAX_INITIAL_POST_SIZE

             then append the post data to the HTTP request header. This limit
             is no magic limit but only set to prevent really huge POSTs to
             get the data duplicated with malloc() and family. */

          result = add_buffer(req_buffer, "\r\n", 2); /* end of headers! */
          if(result)
            return result;

          if(!conn->bits.upload_chunky) {
            /* We're not sending it 'chunked', append it to the request
               already now to reduce the number if send() calls */
            result = add_buffer(req_buffer, data->set.postfields,
                                (size_t)postsize);
            included_body = postsize;
          }
          else {
            /* Append the POST data chunky-style */
            result = add_bufferf(req_buffer, "%x\r\n", (int)postsize);
            if(CURLE_OK == result)
              result = add_buffer(req_buffer, data->set.postfields,
                                  (size_t)postsize);
            if(CURLE_OK == result)
              result = add_buffer(req_buffer,
                                  "\x0d\x0a\x30\x0d\x0a\x0d\x0a", 7);
                                  /* CR  LF   0  CR  LF  CR  LF */
            included_body = postsize + 7;
          }
          if(result)
            return result;
        }
        else {
          /* A huge POST coming up, do data separate from the request */
          http->postsize = postsize;
          http->postdata = data->set.postfields;

          http->sending = HTTPSEND_BODY;

          conn->fread = (curl_read_callback)readmoredata;
          conn->fread_in = (void *)conn;

          /* set the upload size to the progress meter */
          Curl_pgrsSetUploadSize(data, http->postsize);

          add_buffer(req_buffer, "\r\n", 2); /* end of headers! */
        }
      }
      else {
        add_buffer(req_buffer, "\r\n", 2); /* end of headers! */

        if(data->set.postfieldsize) {
          /* set the upload size to the progress meter */
          Curl_pgrsSetUploadSize(data, postsize?postsize:-1);

          /* set the pointer to mark that we will send the post body using
             the read callback */
          http->postdata = (char *)&http->postdata;
        }
      }
      /* issue the request */
      result = add_buffer_send(req_buffer, conn, &data->info.request_size,
                               (size_t)included_body, FIRSTSOCKET);

      if(result)
        failf(data, "Failed sending HTTP POST request");
      else
        result =
          Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
                        &http->readbytecount,
                        http->postdata?FIRSTSOCKET:-1,
                        http->postdata?&http->writebytecount:NULL);
      break;

    default:
      add_buffer(req_buffer, "\r\n", 2);

      /* issue the request */
      result = add_buffer_send(req_buffer, conn,
                               &data->info.request_size, 0, FIRSTSOCKET);

      if(result)
        failf(data, "Failed sending HTTP request");
      else
        /* HTTP GET/HEAD download: */
        result = Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE,
                               &http->readbytecount,
                               http->postdata?FIRSTSOCKET:-1,
                               http->postdata?&http->writebytecount:NULL);
    }
    if(result)
      return result;
  }

  return CURLE_OK;
}
#endif