74 lines
2.9 KiB
Ruby
74 lines
2.9 KiB
Ruby
# coding: utf-8
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# typed: strict
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# frozen_string_literal: true
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################################################################################
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#
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# Copyright (C) 2006 Peter J Jones (pjones@pmade.com)
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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################################################################################
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class PDF::Reader
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################################################################################
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# An internal PDF::Reader class that represents a stream object from a PDF. Stream
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# objects have 2 components, a dictionary that describes the content (size,
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# compression, etc) and a stream of bytes.
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#
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class Stream
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attr_accessor :hash, :data
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################################################################################
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# Creates a new stream with the specified dictionary and data. The dictionary
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# should be a standard ruby hash, the data should be a standard ruby string.
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def initialize(hash, data)
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@hash = TypeCheck.cast_to_pdf_dict!(hash)
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@data = data
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@udata = nil
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end
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################################################################################
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# apply this streams filters to its data and return the result.
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def unfiltered_data
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return @udata if @udata
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@udata = data.dup
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if hash.has_key?(:Filter)
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options = []
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if hash.has_key?(:DecodeParms)
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if hash[:DecodeParms].is_a?(Hash)
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options = [hash[:DecodeParms]]
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else
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options = hash[:DecodeParms]
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end
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end
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Array(hash[:Filter]).each_with_index do |filter, index|
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@udata = Filter.with(filter, options[index] || {}).filter(@udata)
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end
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end
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@udata
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end
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end
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################################################################################
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end
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################################################################################
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