I'm using multi interface of libcurl 7.23.1. Whenever I configure FTP in order 
to resume interrupted upload (CURLOPT_UPLOAD = 1, CURLOPT_RESUME_FROM = -1, 
CURLOPT_APPEND = -1), progress function is called with total number of bytes to 
upload(ultotal) set to -1.

Couldn't it provide the number of remaining to transfer bytes? Without this 
number I can not estimate progress of whole file transfer, because I don't know 
how much data FTP server really recieved during previous, interrupted transfer.

Marcin Adamski

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