https://bugzilla.wikimedia.org/show_bug.cgi?id=37692
Web browser: ---
Bug #: 37692
Summary: Assumes one-based page numbers; doesn't work with
ImageMagick 6.7.7-2 which returns zero-based page
numbers
Product: MediaWiki extensions
Version: master
Platform: All
OS/Version: Mac OS X 10.7
Status: NEW
Severity: normal
Priority: Unprioritized
Component: PagedTiffHandler
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Mobile Platform: ---
Installed the extension on my local test wiki running from master. Got the
extension through a git clone of the PagedTiffHandler master.
After I had set it up, I was no longer able to upload tiff files.
Some debugging revealed that PagedTiffHandler.image.php assumed that the page
numbers as returned by ImageMagick's identify command started at 1. However, my
ImageMagick 6.7.7-2 returns zero-based page numbers (i.e., the first page got
"page=0"). As a result, the extension always complained about "inconsistent
page numbering in TIFF directory" in PagedTiffInfoParserState::finishPage() on
the first page since $this->prevPage is also initialized to zero.
I don't know whether other versions of ImageMagick return one-based page
numbers.
I fixed this locally by hacking in mapping zero-based page numbers to one-based
numbers in parseIdentifyOutput(), and then the extension worked as advertized.
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