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# coding: utf-8
################################################################################
#
# Copyright (C) 2006 Peter J Jones (pjones@pmade.com)
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
################################################################################
class PDF::Reader
################################################################################
# Various parts of a PDF file can be passed through a filter before being stored to provide
# support for features like compression and encryption. This class is for decoding that
# content.
#
module Filter # :nodoc:
################################################################################
# creates a new filter for decoding content.
#
# Filters that are only used to encode image data are accepted, but the data is
# returned untouched. At this stage PDF::Reader has no need to decode images.
#
def self.with(name, options = {})
case name.to_sym
when :ASCII85Decode then PDF::Reader::Filter::Ascii85.new(options)
when :ASCIIHexDecode then PDF::Reader::Filter::AsciiHex.new(options)
when :CCITTFaxDecode then PDF::Reader::Filter::Null.new(options)
when :DCTDecode then PDF::Reader::Filter::Null.new(options)
when :FlateDecode then PDF::Reader::Filter::Flate.new(options)
when :JBIG2Decode then PDF::Reader::Filter::Null.new(options)
when :JPXDecode then PDF::Reader::Filter::Null.new(options)
when :LZWDecode then PDF::Reader::Filter::Lzw.new(options)
when :RunLengthDecode then PDF::Reader::Filter::RunLength.new(options)
else
raise UnsupportedFeatureError, "Unknown filter: #{name}"
end
end
end
end
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