Hello!
I've set up mgetty to email incoming faxes to me and my buddy. When a
fax comes in, it's converted to gif files (1 per page) and emailed using
sendmail.
The problem is, I can read the faxes fine (using Evolution), but my
buddy can't (using IE and SM). When I switch to Mozilla and SM, I have
the same corruption. When either of us save the attachments to a file
using SM, the file is corrupted (3 bytes shorter than it should be).
Further examination of a hexdump shows that something weird is going on.
$ ls -l realfax1.gif test1.gif
-rw------- 1 root root 85326 Apr 29 01:39 realfax1.gif
-rw------- 1 root root 85323 Apr 29 01:00 test1.gif
$ cmp realfax1.gif test1.gif
realfax1.gif test1.gif differ: char 17063, line 62
$ file realfax1.gif test1.gif
realfax1.gif: GIF image data, version 87a, 1728 x 2164
test1.gif: GIF image data, version 87a, 1728 x 2164
$ xxd realfax1.gif realfax1.gif.xxd
$ xxd test1.gif test1.gif.xxd
$ diff -u realfax1.gif.xxd test1.gif.xxd | sort +0.1 -0.10 +0.0r > out
$ head out
+++ test1.gif.xxd 2004-04-29 02:00:47.838404192 -0700
--- realfax1.gif.xxd 2004-04-29 02:00:35.269314984 -0700
0004270: defd 0743 7124 4bf3 4453 7565 5bf7 8563 ...Cq$K.DSue[..c
0004280: 79a6 6bfb c673 7de7 7bff 0706 8543 62d1 y.k..s}.{....Cb.
0004290: 7844 2695 4b66 d3f9 8446 a553 6ad5 7ac5 xD&.Kf...F.Sj.z.
-00042a0: 66b5 5b6e d7fb 0587 4f00 7282 7c0e 9c01 f.[n....O.r.|...
+00042a0: 66b5 5b6e d7fb 5874 f007 2827 c0e9 c012 f.[n..Xt..('....
-00042b0: 28b4 d8fd 86c7 e573 7add 7ec7 e7f5 fba4 (......sz.~.....
+00042b0: 8b4d 8fd8 6c7e 5737 add7 ec7e 7f5f ba4f .M..l~W7...~._.O
-00042c0: faa3 5e6b 680b 293b 184c 0344 2cfc 5b54 ..^kh.);.L.D,.[T
$
Starting at 42a6, the entire file is shifted *four bits* to the left!
'0587 4f00' becomes '5874 f007', and so on for quite a ways... until
8f4c or so, where it slips another four bits to the left. To lose three
bytes, I guess it slips 6 times.
What the heck is causing this???
I'd include this fax gif file, except a) it's my tax return, and b) it
happens to every gif file we've tried viewing with SM. The commands to
create the gif file were:
$ cat (some fax file) | g3topbm -s | ppmtogif > out.gif
Then to encode it:
$ mewencode -b out.gif > out.base64
Since it's ok in Evolution, I'm inclined to think the encoding process
is just fine.
I'm using:
----------
squirrelmail-1.4.2-1.noarch.rpm
php-4.3.2-8.ent.src.rpm
httpd-2.0.46-32.ent.src.rpm
sendmail-8.12.11-1.i386.rpm
evolution-1.5.3-1.i386.rpm
mozilla-1.6-0.i386.rpm
IE 5.5
Red Hat Enterprise Linux AS release 3 (Taroon Update 1 Beta)
$ ls -m /usr/share/squirrelmail/plugins
abook_take, administrator, bug_report, calendar, change_pass,
delete_move_next, filters, fortune, index.php, info, listcommands,
mail_fetch, message_details, newmail, sent_subfolders, spamcop,
squirrelspell, translate
$ grep plugins /usr/share/squirrelmail/config/config.php
$plugins[0] = 'delete_move_next';
$plugins[1] = 'squirrelspell';
$plugins[2] = 'newmail';
$plugins[3] = 'change_pass';
$plugins[4] = 'filters';
$plugins[5] = 'fortune';
$plugins[6] = 'message_details';
$plugins[7] = 'bug_report';
$plugins[8] = 'calendar';
$plugins[9] = 'info';
$plugins[10] = 'abook_take';
$plugins[11] = 'mail_fetch';
$plugins[12] = 'listcommands';
$plugins[13] = 'administrator';
$plugins[14] = 'sent_subfolders';
$plugins[15] = 'translate';
--
Penelope Fudd <[EMAIL PROTECTED]>
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