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From: bugzilla-daemon@openzim.org
To: manuel.schneider@wikimedia.ch
Subject: [Bug 5] New: zimreader on arm: miss-aligned dirent header
Message-ID: <bug-5-1@http.bugs.openzim.org/>
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Date: Sat, 18 Jul 2009 14:08:41 +0200
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http://bugs.openzim.org/show_bug.cgi?id=5

           Summary: zimreader on arm: miss-aligned dirent header
           Product: openZIM
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: zimlib
        AssignedTo: manuel.schneider@wikimedia.ch
        ReportedBy: openmoko@rcie.de
   Estimated Hours: 0.0


Created an attachment (id=1)
 --> (http://bugs.openzim.org/attachment.cgi?id=1)
Patch to correct alignment of the dirent header

-- System Information:
Debian Release: 5.0.2
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: armel (armv4tl)

Kernel: Linux 2.6.24-20081103.git7172ec57 (PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8) (ignored: LC_ALL
set to de_DE.UTF-8)

Plattform: openmoko Freerunner

Since the dirent header variable in 

  zim::std::istream& operator>> (std::istream& in, Dirent& dirent)

is define as char, the compiler chooses 2-byte-alignment. Later
4-byte access will fail on architectures with poor miss-alignment
recovery (see [1]).

Possibly there are further variables to be explicitly alignment.
I only fixed the one that made zimreader fail (see patch).

Note: The patch is gcc-specific, which may not be desired.

[1] linux-2.6.28/Documentation/unaligned-memory-access.txt

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