Class: Omnizip::Formats::Ole::RangesIOMigrateable

Inherits:
RangesIOResizeable show all
Defined in:
lib/omnizip/formats/ole/ranges_io.rb

Overview

RangesIO that can migrate between BAT and SBAT based on size

Instance Attribute Summary collapse

Attributes inherited from RangesIOResizeable

#bat

Attributes inherited from RangesIO

#io, #pos, #ranges, #size

Instance Method Summary collapse

Methods inherited from RangesIOResizeable

#free

Methods inherited from RangesIO

#close, #eof?, #free, #inspect, open, #read, #rewind, #write

Constructor Details

#initialize(dirent, mode = "r") ⇒ RangesIOMigrateable

Initialize migrateable RangesIO

Parameters:

  • dirent (Dirent) —

    Associated dirent

  • mode (String) (defaults to: "r") —

    Open mode



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# File 'lib/omnizip/formats/ole/ranges_io.rb', line 294

def initialize(dirent, mode = "r")
  @dirent = dirent
  bat = dirent.ole.bat_for_size(dirent.size)
  super(bat, first_block: dirent.first_block, size: dirent.size)
  @mode = mode
end

Instance Attribute Details

#dirent ⇒ Dirent (readonly)

Returns Associated dirent.

Returns:

  • (Dirent) —

    Associated dirent



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# File 'lib/omnizip/formats/ole/ranges_io.rb', line 288

def dirent
  @dirent
end

Instance Method Details

#first_block ⇒ Object

Forward first_block to dirent (for reading)



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# File 'lib/omnizip/formats/ole/ranges_io.rb', line 336

def first_block
  @first_block
end

#first_block=(val) ⇒ Object 



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# File 'lib/omnizip/formats/ole/ranges_io.rb', line 340

def first_block=(val)
  @first_block = val
  @dirent.first_block = val
end

#truncate(new_size) ⇒ Object

Truncate with BAT migration support

Parameters:

  • new_size (Integer) —

    New size in bytes



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# File 'lib/omnizip/formats/ole/ranges_io.rb', line 309

def truncate(new_size)
  new_bat = @dirent.ole.bat_for_size(new_size)

  if new_bat.instance_of?(@bat.class)
    super
  else
    # BAT migration needed
    pos = [@pos, new_size].min
    self.pos = 0
    keep = read([@size, new_size].min)
    super(0)

    @bat = new_bat
    @io = new_bat.io
    super

    self.pos = 0
    write(keep)
    self.pos = pos
  end

  # Update dirent's first_block and size after any resize
  @dirent.first_block = @first_block
  @dirent.size = new_size
end

#writeable? ⇒ Boolean

Check if writable

Returns:

  • (Boolean) 


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# File 'lib/omnizip/formats/ole/ranges_io.rb', line 302

def writeable?
  @mode.include?("w") || @mode.include?("a") || @mode.include?("+")
end