new upload-buffer size design that starts with a smallish buffer and increases

#define _MPRINTF_REPLACE /* use our functions only */

#include <curl/mprintf.h>

#ifndef min

#define min(a, b)   ((a) < (b) ? (a) : (b))

#endif

CURLcode 

_Transfer(struct connectdata *c_conn)

{

          if(data->crlf)

            buf = data->buffer; /* put it back on the buffer */

          nread = data->fread(buf, 1, BUFSIZE, data->in);

          nread = data->fread(buf, 1, conn->upload_bufsize, data->in);

          /* the signed int typecase of nread of for systems that has

             unsigned size_t */

      if (urg)

	return urg;

      if(data->progress.ulspeed > conn->upload_bufsize) {

        /* If we're transfering more data per second than fits in our buffer,

           we increase the buffer size to adjust to the current

           speed. However, we must not set it larger than BUFSIZE. We don't

           adjust it downwards again since we don't see any point in that!

        */

        conn->upload_bufsize=(long)min(data->progress.ulspeed, BUFSIZE);

      }

      if (data->timeout && (tvdiff (now, start) > data->timeout)) {

	failf (data, "Operation timed out with %d out of %d bytes received",

	       bytecount, conn->size);