Class: PDF::Reader::TypeCheck

Inherits:
Object
  • Object
show all
Defined in:
lib/pdf/reader/type_check.rb

Overview

Cast untrusted input (usually parsed out of a PDF file) to a known type

Class Method Summary collapse

Class Method Details

.cast_to_int!(obj) ⇒ Object 



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# File 'lib/pdf/reader/type_check.rb', line 12

def self.cast_to_int!(obj)
  if obj.is_a?(Integer)
    obj
  elsif obj.nil?
    0
  elsif obj.respond_to?(:to_i)
    obj.to_i
  else
    raise MalformedPDFError, "Unable to cast to integer"
  end
end

.cast_to_numeric!(obj) ⇒ Object 



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# File 'lib/pdf/reader/type_check.rb', line 24

def self.cast_to_numeric!(obj)
  if obj.is_a?(Numeric)
    obj
  elsif obj.nil?
    0
  elsif obj.respond_to?(:to_f)
    obj.to_f
  elsif obj.respond_to?(:to_i)
    obj.to_i
  else
    raise MalformedPDFError, "Unable to cast to numeric"
  end
end

.cast_to_pdf_dict!(obj) ⇒ Object 



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# File 'lib/pdf/reader/type_check.rb', line 71

def self.cast_to_pdf_dict!(obj)
  if obj.is_a?(Hash)
    obj
  elsif obj.respond_to?(:to_h)
    obj.to_h
  else
    raise MalformedPDFError, "Unable to cast to hash"
  end
end

.cast_to_pdf_dict_with_stream_values!(obj) ⇒ Object 



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# File 'lib/pdf/reader/type_check.rb', line 81

def self.cast_to_pdf_dict_with_stream_values!(obj)
  if obj.is_a?(Hash)
    result = Hash.new
    obj.each do |k, v|
      raise MalformedPDFError, "Expected a stream" unless v.is_a?(PDF::Reader::Stream)
      result[cast_to_symbol!(k)] = v
    end
    result
  elsif obj.respond_to?(:to_h)
    cast_to_pdf_dict_with_stream_values!(obj.to_h)
  else
    raise MalformedPDFError, "Unable to cast to hash"
  end
end

.cast_to_string!(string) ⇒ Object 



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# File 'lib/pdf/reader/type_check.rb', line 38

def self.cast_to_string!(string)
  if string.is_a?(String)
    string
  elsif string.nil?
    ""
  elsif string.respond_to?(:to_s)
    string.to_s
  else
    raise MalformedPDFError, "Unable to cast to string"
  end
end

.cast_to_symbol(obj) ⇒ Object 



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# File 'lib/pdf/reader/type_check.rb', line 50

def self.cast_to_symbol(obj)
  if obj.is_a?(Symbol)
    obj
  elsif obj.nil?
    nil
  elsif obj.respond_to?(:to_sym)
    obj.to_sym
  else
    raise MalformedPDFError, "Unable to cast to symbol"
  end
end

.cast_to_symbol!(obj) ⇒ Object 



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# File 'lib/pdf/reader/type_check.rb', line 62

def self.cast_to_symbol!(obj)
  res = cast_to_symbol(obj)
  if res
    res
  else
    raise MalformedPDFError, "Unable to cast to symbol"
  end
end