Section 4 : Troubleshooting

Q441: Why are my tiff files corrupted?


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Q.
Why are my tiff files corrupted?

A.
Date: Tue, 18 Jun 1996 09:48:06 -0700
From: Sam Leffler <sam@hyla.chez.sgi.com>
Subject: Re: corrupted tiff files

    To:  hylafax-users@hylafax.org
    Subject:  corrupted tiff files
    Date: Sat, 15 Jun 1996 07:00:49 EDT
    From:  "Thomas B. Clark" 

    I am a recent convert, and LOVE Hylafax; 
    unfortunately, I still have not successfully received 
    a fax, although I can send them normally.
    
    This is additional information about the problem I 
    already posted.  The TIFF files are actually corrupted, 
    since another program does not recognize them as TIFF.
    
    System:  Sparc 20, Solaris 2.5
    Serial port:  /dev/cua/6 (MAGMA serial board, no 
    parameters preset)
    Modem:  SupraFax 28.8
    
    Email received from Hylafax:
    
    recvq/fax00010.tif:
    Could not open recvq/fax00010.tif; either not TIFF or corrupted.
    ReceivedOn: cua_6
    
    The full document was not received because:
    
        Normal and proper end of connection
    
        ---- Transcript of session follows ----
    
    Jun 15 06:51:51.86: [29378]: SESSION BEGIN 00000017 19199662253
    Jun 15 06:51:51.89: [29378]: <-- [4:ATA\r]
    Jun 15 06:52:00.01: [29378]: --> [5:+FCON]
    Jun 15 06:52:00.02: [29378]: ANSWER: FAX CONNECTION
    Jun 15 06:52:00.02: [29378]: RECV FAX: begin
    Jun 15 06:52:01.59: [29378]: --> [29:+FTSI: " 1 919 493 2030     "]
    Jun 15 06:52:01.59: [29378]: REMOTE TSI "1 919 493 2030"
    Jun 15 06:52:02.00: [29378]: --> [22:+FDCS: 1,5,0,0,0,0,0,0]
    Jun 15 06:52:02.00: [29378]: REMOTE wants 14400 bit/s
    Jun 15 06:52:02.00: [29378]: REMOTE wants page width 1728 pixels in 215 mm
    Jun 15 06:52:02.00: [29378]: REMOTE wants A4 page length (297 mm)
    Jun 15 06:52:02.00: [29378]: REMOTE wants 7.7 line/mm
    Jun 15 06:52:02.00: [29378]: REMOTE wants 1-D MR
    Jun 15 06:52:02.10: [29378]: --> [2:OK]
    Jun 15 06:52:02.10: [29378]: <-- [7:AT+FDR\r]
    Jun 15 06:52:05.16: [29378]: --> [5:+FCFR]
    Jun 15 06:52:07.20: [29378]: --> [22:+FDCS: 1,5,0,0,0,0,0,0]
    Jun 15 06:52:07.20: [29378]: REMOTE wants 14400 bit/s
    Jun 15 06:52:07.20: [29378]: REMOTE wants page width 1728 pixels in 215 mm
    Jun 15 06:52:07.20: [29378]: REMOTE wants A4 page length (297 mm)
    Jun 15 06:52:07.20: [29378]: REMOTE wants 7.7 line/mm
    Jun 15 06:52:07.20: [29378]: REMOTE wants 1-D MR
    Jun 15 06:52:07.20: [29378]: --> [7:CONNECT]
    Jun 15 06:52:07.20: [29378]: RECV: begin page
    Jun 15 06:52:07.21: [29378]: RECV: send trigger 021
    Jun 15 06:52:09.19: [29378]: RECV: 0 total lines, 0 bad lines, 0 
consecutive bad lines

Notice 0 lines received.

    Jun 15 06:52:09.21: [29378]: --> [17:+FPTS: 1,2219,0,0]
    Jun 15 06:52:11.14: [29378]: --> [7:+FET: 0]
    Jun 15 06:52:11.14: [29378]: RECV recv MPS (more pages, same document)
    Jun 15 06:52:11.25: [29378]: --> [2:OK]
    Jun 15 06:52:11.40: [29378]: RECV send MCF (message confirmation)
    Jun 15 06:52:11.40: [29378]: RECV FAX (00000017): from 1 919 493 2030, 
page 1 in 0:09, A4, 7.7 line/mm, 1-D MR
    Jun 15 06:52:11.40: [29378]: <-- [7:AT+FDR\r]
    Jun 15 06:52:13.43: [29378]: --> [7:CONNECT]
    Jun 15 06:52:13.43: [29378]: RECV: begin page
    Jun 15 06:52:13.43: [29378]: RECV: send trigger 021
    Jun 15 06:52:16.10: [29378]: RECV: 241 total lines, 240 bad lines, 240 
consecutive bad lines

Notice 240 of 241 lines received were bad (i.e. had errors).

    Jun 15 06:52:16.10: [29378]: --> [17:+FPTS: 1,2219,0,0]
    Jun 15 06:52:17.98: [29378]: --> [7:+FET: 2]
    Jun 15 06:52:17.98: [29378]: RECV recv EOP (no more pages or documents)
    Jun 15 06:52:18.08: [29378]: --> [2:OK]
    Jun 15 06:52:18.08: [29378]: RECV: REJECT page quality, 0% good lines (95% 
required)
    Jun 15 06:52:18.08: [29378]: RECV send RTN (retrain negative)
    Jun 15 06:52:18.08: [29378]: <-- [10:AT+FPTS=2\r]
    Jun 15 06:52:18.33: [29378]: --> [2:OK]
    Jun 15 06:52:18.33: [29378]: <-- [7:AT+FDR\r]
    Jun 15 06:52:21.38: [29378]: --> [8:+FHNG: 0]
    Jun 15 06:52:21.38: [29378]: REMOTE HANGUP: Normal and proper end of 
connection (code 0)
    Jun 15 06:52:21.38: [29378]: RECV FAX (00000017): recvq/fax00010.tif from 
1 919 493 2030, route to , 1 pages in 0:21
    Jun 15 06:52:21.44: [29378]: RECV FAX: Normal and proper end of connection
    Jun 15 06:52:21.44: [29378]: RECV FAX (00000017): session with 1 919 493 
2030 terminated abnormally: Normal and proper end of connection
    Jun 15 06:52:21.44: [29378]: RECV FAX: bin/faxrcvd "recvq/fax00010.tif" 
"cua_6" "00000017" "Normal and proper end of connection"
    
The resulting TIFF were considered "corrupted" because they had no valid
data in them (yes, the error message could be more informative).  You need
to figure out why you're receiving no data or garbage data.  Frequently a
problem such as this is caused by the wrong RecvFillOrder or a host-modem
flow control problem.  You might also try disabling copy quality checking
in the host so that you capture the raw data from the modem--you can then
look at it with some of the TIFF tools to, for example, figure out if the
bit order is opposite to what is expected.

        Sam


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