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Re: truncated files retrieved via FTP in ASCII mode

From: David McCreedy <mccreedytpf_at_gmail.com>
Date: Mon, 18 Jan 2010 13:10:19 -0700

I've attached my change to ftp.c along with new test129 (which is based on
test106 and didn't need an FTP server update after all).

Thank you,

-David

On Thu, Jan 14, 2010 at 3:28 PM, Daniel Stenberg <daniel_at_haxx.se> wrote:

> On Wed, 13 Jan 2010, David McCreedy wrote:
>
> The FTP server is returning the wrong SIZE for the file because it doesn't
>> take the mode into account. (I think this is a common FTP server bug.)
>>
>
> Yeah, I think it is so common that FTP server authors probably don't even
> consider it to be a bug.
>
>
> I can kludge the ftp_state_get_resp function in ftp.c to get back to the
>> old behavior:
>>
>
> + if((instate != FTP_LIST) && (data->set.prefer_ascii))
>>
>> + size = -1; /* kludge for servers that misstate file size in ASCII
>> mode */
>>
>
> ...
>
>
> But there must be a better way to deal with this...
>>
>
> libcurl has a very long-standing TODO about not properly supporting FTP
> ASCII mode transfers (http://curl.haxx.se/docs/todo.html#ASCII_support)
> and this is related to that.
>
> I can only think of one better way to deal with this issue, and that is to
> somehow count the number of CRLF occurances in the data and increase the
> amount of expected downloaded bytes by that number. But that's kind of an
> after-the-fact approach that doesn't quite help since we must first download
> the proper amount of data before we can check for contents and count
> patterns etc...
>
> I think we should work on getting a test case like this added to the test
> suite so that we can fix this in a way that won't get broken again in 6
> months. Unfortunately I think it requires a modification of the test FTP
> server.
>
> --
>
> / daniel.haxx.se
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Received on 2010-01-18