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########################################################### |
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# A Perl package for showing/modifying JPEG (meta)data. # |
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# Copyright (C) 2004,2005,2006 Stefano Bettelli # |
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# See the COPYING and LICENSE files for license terms. # |
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########################################################### |
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package Image::MetaData::JPEG::Segment; |
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no integer; |
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use strict; |
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use warnings; |
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########################################################### |
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# This routine is a generic segment parsers, which saves # |
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# the first 30 bytes of the segment in a record, then # |
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# generates an error to inhibit update(). In this way, # |
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# the segment must be rewritten to disk unchanged, but # |
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# the nature of the segment is at least hinted by the # |
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# initial bytes (just for debugging ...). # |
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########################################################### |
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sub parse_unknown { |
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my ($this) = @_; |
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# save the first 30 bytes and translate non-printing characters |
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my $bytes = 30; |
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$this->store_record("First $bytes bytes ...", $ASCII, 0, $bytes); |
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# generate an error |
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$this->die('Unknown segment type'); |
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} |
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########################################################### |
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# This method parses a COM segment. This is very simple # |
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# since it is just one string. # |
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########################################################### |
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sub parse_com { |
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my ($this) = @_; |
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# save the whole comment as a single value |
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$this->store_record('Comment', $ASCII, 0, $this->size()); |
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} |
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########################################################### |
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# Require all other segment-specific parsers. # |
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########################################################### |
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require 'Image/MetaData/JPEG/parsers/app0.pl'; |
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require 'Image/MetaData/JPEG/parsers/app1.pl'; |
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require 'Image/MetaData/JPEG/parsers/app2.pl'; |
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require 'Image/MetaData/JPEG/parsers/app3.pl'; |
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require 'Image/MetaData/JPEG/parsers/app12.pl'; |
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require 'Image/MetaData/JPEG/parsers/app13.pl'; |
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require 'Image/MetaData/JPEG/parsers/app14.pl'; |
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require 'Image/MetaData/JPEG/parsers/image.pl'; |
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# successful package load |
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1; |