class PDF::Reader::TypeCheck


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

def self.cast_to_int!(obj) 

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

def self.cast_to_numeric!(obj) 

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

def self.cast_to_pdf_dict!(obj) 

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

def self.cast_to_pdf_dict_with_stream_values!(obj) 

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

def self.cast_to_string!(string) 

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

def self.cast_to_symbol(obj) 

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

def self.cast_to_symbol!(obj) 

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