https://bugzilla.wikimedia.org/show_bug.cgi?id=34428

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             Bug #: 34428
           Summary: PHP version of DiffHistoryBlob::patch() computes
                    incorrect base text checksum
           Product: MediaWiki
           Version: 1.19
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: History/Diffs
        AssignedTo: [email protected]
        ReportedBy: [email protected]
    Classification: Unclassified


Some revisions stored with DiffHistoryBlob in Wikimedia external storage cannot
be decoded if xdiff_string_bpatch() is not available and thus the PHP port is
used. Revision::getText() returns false.

The debug log shows "incorrect base checksum". If the checksum check is
disabled, the revision appears to be decoded successfully. Perhaps an incorrect
implementation of the adler32 checksum is at fault.

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