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.IX Title "Image::ExifTool::Fixup 3pm"
.TH Image::ExifTool::Fixup 3pm 2024-02-03 "perl v5.38.2" "User Contributed Perl Documentation"
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.SH NAME
Image::ExifTool::Fixup \- Utility to handle pointer fixups
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&    use Image::ExifTool::Fixup;
\&
\&    $fixup = Image::ExifTool::Fixup\->new;
\&
\&    # add a new fixup to a pointer at the specified offset in data
\&    $fixup\->AddFixup($offset);
\&
\&    # add a new Fixup object to the tree
\&    $fixup\->AddFixup($subFixup);
\&
\&    $fixup\->{Start} += $shift1;   # shift pointer offsets and values
\&
\&    $fixup\->{Shift} += $shift2;   # shift pointer values only
\&
\&    # recursively apply fixups to the specified data
\&    $fixup\->ApplyFixups(\e$data);
\&
\&    $fixup\->Dump();               # dump debugging information
\&
\&    $fixup\->IsEmpty();            # return true if no offsets to fix
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
This module contains the code to keep track of pointers in memory and to
shift these pointers as required.  It is used by ExifTool to maintain the
pointers in image file directories (IFD's).
.SH NOTES
.IX Header "NOTES"
Keeps track of pointers with different byte ordering, and relies on
\&\fBImage::ExifTool::GetByteOrder()\fR to determine the current byte ordering
when adding new pointers to a fixup.
.PP
Maintains a hierarchical list of fixups so that the whole hierarchy can
be shifted by a simple shift at the base.  Hierarchy is collapsed to a
linear list when \fBApplyFixups()\fR is called.
.SH AUTHOR
.IX Header "AUTHOR"
Copyright 2003\-2024, Phil Harvey (philharvey66 at gmail.com)
.PP
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBImage::ExifTool\fR\|(3pm)