https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4789
Summary: PER Bit string display misleading
Product: Wireshark
Version: SVN
Platform: All
OS/Version: Windows XP
Status: NEW
Severity: Normal
Priority: Low
Component: Wireshark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: Neil.Piercy@xxxxxxxxxxxx
Neil Piercy <Neil.Piercy@xxxxxxxxxxxx> changed:
What |Removed |Added
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Attachment #4687| |review_for_checkin?
Flag| |
Created an attachment (id=4687)
--> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=4687)
patch to improve display
Build Information:
TShark 1.2.8ipa36
Copyright 1998-2010 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled (32-bit) with GLib 2.22.4, with WinPcap (version unknown), with libz
1.2.3, without POSIX capabilities, without libpcre, with SMI 0.4.8, with c-ares
1.7.0, with Lua 5.1, with GnuTLS 2.8.5, with Gcrypt 1.4.5, with MIT Kerberos,
with GeoIP.
Running on Windows XP Service Pack 3, build 2600, with WinPcap version 4.1.1
(packet.dll version 4.1.0.1753), based on libpcap version 1.0 branch 1_0_rel0b
(20091008), GnuTLS 2.8.5, Gcrypt 1.4.5.
Built using Microsoft Visual C++ 9.0 build 30729
--
See email thread
http://www.wireshark.org/lists/wireshark-dev/201003/msg00295.html
PER bit strings are displayed in hex (FT_BYTES), which means they need padding.
In 1.0.x. they were MSB-padded, but in 1.2.x they are LSB padded - neither is
right or wrong, but when (as is common in 3GPP usage) the bitstring is actually
used as a form of compression for integer values, LSB padding causes a lot of
confusion.
The ideal change would probably be to display in binar rather than hex, but the
proposed change is simpler and effective IMHO, as illustrated by the follwing
example:
1.0.x (MSB-padded)
dl-HFN: 00000004 [bit length 25]
1.2.x/trunk (LSB-padded)
dl-HFN: 00000200 [bit length 25]
1.2.x/trunk (LSB-padded - with explanation)
dl-HFN: 00000200 [bit length 25, 7 LSB pad bits, decimal value 4]
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