1Image::ExifTool::Fixup(U3s)er Contributed Perl DocumentatIimoange::ExifTool::Fixup(3)
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6 Image::ExifTool::Fixup - Utility to handle pointer fixups
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9 use Image::ExifTool::Fixup;
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11 $fixup = new Image::ExifTool::Fixup;
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13 # add a new fixup to a pointer at the specified offset in data
14 $fixup->AddFixup($offset);
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16 # add a new Fixup object to the tree
17 $fixup->AddFixup($subFixup);
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19 $fixup->{Start} += $shift1; # shift pointer offsets and values
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21 $fixup->{Shift} += $shift2; # shift pointer values only
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23 # recursively apply fixups to the specified data
24 $fixup->ApplyFixups(\$data);
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26 $fixup->Dump(); # dump debugging information
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28 $fixup->IsEmpty(); # return true if no offsets to fix
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31 This module contains the code to keep track of pointers in memory and
32 to shift these pointers as required. It is used by ExifTool to
33 maintain the pointers in image file directories (IFD's).
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36 Keeps track of pointers with different byte ordering, and relies on
37 Image::ExifTool::GetByteOrder() to determine the current byte ordering
38 when adding new pointers to a fixup.
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40 Maintains a hierarchical list of fixups so that the whole hierarchy can
41 be shifted by a simple shift at the base. Hierarchy is collapsed to a
42 linear list when ApplyFixups() is called.
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45 Copyright 2003-2019, Phil Harvey (phil at owl.phy.queensu.ca)
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47 This library is free software; you can redistribute it and/or modify it
48 under the same terms as Perl itself.
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51 Image::ExifTool(3pm)
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55perl v5.30.0 2019-10-10 Image::ExifTool::Fixup(3)