Class: Bayonetta::EFFFile

Inherits:
Object
  • Object
show all
Includes:
Alignment, Endianness
Defined in:
lib/bayonetta/eff.rb

Defined Under Namespace

Classes: Directory

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(f = nil, big = false, id = "EF2\0".b) ⇒ EFFFile

Returns a new instance of EFFFile.



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# File 'lib/bayonetta/eff.rb', line 213

def initialize(f = nil, big = false, id = "EF2\0".b)
  @big = big
  if f
    file_name_input = false
    unless f.respond_to?(:read) && f.respond_to?(:seek)
      file_name_input = true
      f = File::new(f, "rb")
    end
    @big = EFFFile.is_big?(f)
    uint = get_uint
    @id = f.read(4)
    check_id
    @directory_number = f.read(4).unpack(uint).first
    @directory_number += 1 if @id == "IDD\0".b
    @directory_infos = @directory_number.times.collect {
      f.read(8).unpack("#{uint}2")
    }
    sorted_directory_infos = @directory_infos.sort { |e1, e2| e1[1] <=> e2[1] }
    sorted_directory_infos.each_with_index { |info, i|
      id, offset = info
      if sorted_directory_infos[i+1]
        size = sorted_directory_infos[i+1][1] - offset
      else
        size = f.size - offset
      end
      info.push(size)
    }
    @directories = @directory_infos.collect { |id, offset, size|
      f.seek(offset)
      of = StringIO::new( f.read(size), "rb")
      Directory::new(of, @big)
    }
    @layout = @directories.each_with_index.collect { |d, i|
      [ @directory_infos[i][0] , d.name]
    }
  else
    @id = id
    @directory_number = 0
    @directory_infos = []
    @directories = []
    @layout = nil
  end

end

Instance Attribute Details

#big ⇒ Object (readonly)

Directory



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# File 'lib/bayonetta/eff.rb', line 176

def big
  @big
end

#id ⇒ Object

Returns the value of attribute id.



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# File 'lib/bayonetta/eff.rb', line 178

def id
  @id
end

#layout ⇒ Object

Returns the value of attribute layout.



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# File 'lib/bayonetta/eff.rb', line 177

def layout
  @layout
end

Class Method Details

.check_id(id) ⇒ Object 



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# File 'lib/bayonetta/eff.rb', line 180

def self.check_id(id)
  raise "Invalid id #{id.inspect}!" unless id == "EF2\0".b || id == "IDD\0".b
end

.is_big?(f) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bayonetta/eff.rb', line 184

def self.is_big?(f)
  f.rewind
  block = lambda { |int|
    id = f.read(4)
    self.check_id(id)
    directory_number = f.read(4).unpack(int).first
    if directory_number * 8 + 8 < f.size
      directory_infos = directory_number.times.collect {
        f.read(8).unpack("#{int}2")
      }
      ( directory_number >= 0 ) && directory_infos.reduce(true) { |memo, (index, offset)|
        memo && index >= 0 && offset > 0 && offset < f.size
      }
    else
      false
    end
  }
  big = block.call("l>")
  f.rewind
  small = block.call("l<")
  f.rewind
  raise "Invalid data!" unless big ^ small
  return big
end

Instance Method Details

#check_id ⇒ Object 



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# File 'lib/bayonetta/eff.rb', line 209

def check_id
  EFFFile.check_id(@id)
end

#compute_layout ⇒ Object 



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# File 'lib/bayonetta/eff.rb', line 265

def compute_layout
  current_offset = 0x1000
  @directory_number.times { |i|
    @directory_infos[i][1] = current_offset
    current_offset += @directories[i].size
    current_offset = align(current_offset, 0x1000)
  }
  current_offset
end

#each_directory ⇒ Object 



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# File 'lib/bayonetta/eff.rb', line 302

def each_directory
  if block_given?
    @directory_number.times { |i|
      yield @directory_infos[i][0], @directories[i]
    }
  else
    to_enum(:each_directory)
  end
end

#push(id, d) ⇒ Object 



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# File 'lib/bayonetta/eff.rb', line 258

def push(id, d)
  @directories.push(d)
  @directory_infos.push [id, nil]
  @directory_number += 1
  self
end

#to_stringio ⇒ Object 



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# File 'lib/bayonetta/eff.rb', line 275

def to_stringio
  total_size = compute_layout
  str = StringIO::new("\x00".b*total_size, "w+b")
  str.rewind

  uint = get_uint

  str.write @id
  if @id == "IDD\0".b
    str.write [@directory_number-1].pack(uint)
  else
    str.write [@directory_number].pack(uint)
  end
  @directory_infos.each { |inf|
    str.write inf.pack("#{uint}*")
  }
  @directory_number.times { |i|
    str.seek(@directory_infos[i][1])
    f = @directories[i].to_stringio
    str.write f.read
  }

  str.rewind
  str.close_write
  str
end