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#------------------------------------------------------------------------------
# File: Rawzor.pm
#
# Description: Read meta information from Rawzor compressed images
#
# Revisions: 09/09/2008 - P. Harvey Created
#
# References: 1) http://www.rawzor.com/
#------------------------------------------------------------------------------
package Image::ExifTool::Rawzor;
use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);
$VERSION = '1.03';
# currently support this version Rawzor images
my $implementedRawzorVersion = 199; # (up to version 1.99)
# Rawzor-specific tags
%Image::ExifTool::Rawzor::Main = (
GROUPS => { 2 => 'Other' },
VARS => { NO_ID => 1 },
NOTES => q{
Rawzor files store compressed images of other formats. As well as the
information listed below, exiftool uncompresses and extracts the meta
information from the original image.
},
OriginalFileType => { },
OriginalFileSize => {
PrintConv => $Image::ExifTool::Extra{FileSize}->{PrintConv},
},
RawzorRequiredVersion => {
ValueConv => '$val / 100',
PrintConv => 'sprintf("%.2f", $val)',
},
RawzorCreatorVersion => {
ValueConv => '$val / 100',
PrintConv => 'sprintf("%.2f", $val)',
},
# compression factor is originalSize/compressedSize (and compression
# ratio is the inverse - ref "Data Compression" by David Salomon)
CompressionFactor => { PrintConv => 'sprintf("%.2f", $val)' },
);
#------------------------------------------------------------------------------
# Extract information from a Rawzor file
# Inputs: 0) ExifTool object reference, 1) dirInfo reference
# Returns: 1 on success, 0 if this wasn't a valid Rawzor file
sub ProcessRWZ($$)
{
my ($et, $dirInfo) = @_;
my $raf = $$dirInfo{RAF};
my ($buff, $buf2);
# read the Rawzor file header:
# 0 string - "rawzor" signature
# 6 int16u - Required SDK version
# 8 int16u - Creator SDK version
# 10 int64u - RWZ file size
# 18 int64u - original raw file size
# 26 undef[12] - reserved
# 38 int64u - metadata offset
$raf->Read($buff, 46) == 46 and $buff =~ /^rawzor/ or return 0;
SetByteOrder('II');
my $reqVers = Get16u(\$buff, 6);
my $creatorVers = Get16u(\$buff, 8);
my $rwzSize = Get64u(\$buff, 10);
my $origSize = Get64u(\$buff, 18);
my $tagTablePtr = GetTagTable('Image::ExifTool::Rawzor::Main');
$et->HandleTag($tagTablePtr, RawzorRequiredVersion => $reqVers);
$et->HandleTag($tagTablePtr, RawzorCreatorVersion => $creatorVers);
$et->HandleTag($tagTablePtr, OriginalFileSize => $origSize);
$et->HandleTag($tagTablePtr, CompressionFactor => $origSize/$rwzSize) if $rwzSize;
# check version numbers
if ($reqVers > $implementedRawzorVersion) {
$et->Warn("Version $reqVers Rawzor images not yet supported");
return 1;
}
my $metaOffset = Get64u(\$buff, 38);
if ($metaOffset > 0x7fffffff) {
$et->Warn('Bad metadata offset');
return 1;
}
# check for the ability to uncompress the information
unless (eval { require IO::Uncompress::Bunzip2 }) {
$et->Warn('Install IO::Compress::Bzip2 to decode Rawzor bzip2 compression');
return 1;
}
# read the metadata header:
# 0 int64u - metadata section 0 end (offset in original file)
# 8 int64u - metadata section 1 start
# 16 int64u - metadata section 1 end
# 24 int64u - metadata section 2 start
# 32 undef[4] - reserved
# 36 int32u - original metadata size
# 40 int32u - compressed metadata size
unless ($raf->Seek($metaOffset, 0) and $raf->Read($buff, 44) == 44) {
$et->Warn('Error reading metadata header');
return 1;
}
my $metaSize = Get32u(\$buff, 36);
if ($metaSize) {
# validate the metadata header and read the compressed metadata
my $end0 = Get64u(\$buff, 0);
my $pos1 = Get64u(\$buff, 8);
my $end1 = Get64u(\$buff, 16);
my $pos2 = Get64u(\$buff, 24);
my $len = Get32u(\$buff, 40);
unless ($raf->Read($buff, $len) == $len and
$end0 + ($end1 - $pos1) + ($origSize - $pos2) == $metaSize and
$end0 <= $pos1 and $pos1 <= $end1 and $end1 <= $pos2)
{
$et->Warn('Error reading image metadata');
return 1;
}
# uncompress the metadata
unless (IO::Uncompress::Bunzip2::bunzip2(\$buff, \$buf2) and
length($buf2) eq $metaSize)
{
$et->Warn('Error uncompressing image metadata');
return 1;
}
# re-assemble the original file (sans image data)
undef $buff; # (can't hurt to free memory as soon as possible)
$buff = substr($buf2, 0, $end0) . ("\0" x ($pos1 - $end0)) .
substr($buf2, $end0, $end1 - $pos1) . ("\0" x ($pos2 - $end1)) .
substr($buf2, $end0 + $end1 - $pos1, $origSize - $pos2);
undef $buf2;
# extract original information by calling ExtractInfo recursively
$et->ExtractInfo(\$buff, { ReEntry => 1 });
undef $buff;
}
# set OriginalFileType from FileType of original file
# then change FileType and MIMEType to indicate a Rawzor image
my $origFileType = $$et{VALUE}{FileType};
if ($origFileType) {
$et->HandleTag($tagTablePtr, OriginalFileType => $origFileType);
$$et{VALUE}{FileType} = 'RWZ';
$$et{VALUE}{MIMEType} = 'image/x-rawzor';
} else {
$et->HandleTag($tagTablePtr, OriginalFileType => 'Unknown');
$et->SetFileType();
}
return 1;
}
1; # end
__END__
=head1 NAME
Image::ExifTool::Rawzor - Read meta information from Rawzor compressed images
=head1 SYNOPSIS
This module is used by Image::ExifTool
=head1 DESCRIPTION
This module contains definitions required by Image::ExifTool to extract meta
information from Rawzor compressed images.
=head1 AUTHOR
Copyright 2003-2015, Phil Harvey (phil at owl.phy.queensu.ca)
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=head1 REFERENCES
=over 4
=item L<http://www.rawzor.com/>
=back
=head1 SEE ALSO
L<Image::ExifTool::TagNames/Rawzor Tags>,
L<Image::ExifTool(3pm)|Image::ExifTool>
=cut
|
