Class: VirtDisk::ClientHead

Inherits:
Object
  • Object
show all
Includes:
ExportMethods
Defined in:
lib/virt_disk/client_head.rb

Direct Known Subclasses

Disk, Partition

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from ExportMethods

#delegate, #delegate=, #exported?, included, #method_missing, #respond_to_missing?

Constructor Details

#initialize(up_stream_module) ⇒ ClientHead

Returns a new instance of ClientHead.



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# File 'lib/virt_disk/client_head.rb', line 7

def initialize(up_stream_module)
  @up_stream_module = up_stream_module
  @start_byte_addr  = 0
  @size             = @up_stream_module.size
  @end_byte_addr    = @size - 1
  @seek_pos         = @start_byte_addr
  self.delegate     = @up_stream_module
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class VirtDisk::ExportMethods

Instance Attribute Details

#end_byte_addr ⇒ Object (readonly)

Returns the value of attribute end_byte_addr.



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# File 'lib/virt_disk/client_head.rb', line 3

def end_byte_addr
  @end_byte_addr
end

#seek_pos ⇒ Object (readonly)

Returns the value of attribute seek_pos.



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# File 'lib/virt_disk/client_head.rb', line 3

def seek_pos
  @seek_pos
end

#size ⇒ Object (readonly)

Returns the value of attribute size.



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# File 'lib/virt_disk/client_head.rb', line 3

def size
  @size
end

#start_byte_addr ⇒ Object (readonly)

Returns the value of attribute start_byte_addr.



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# File 'lib/virt_disk/client_head.rb', line 3

def start_byte_addr
  @start_byte_addr
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/virt_disk/client_head.rb', line 16

def close
  @up_stream_module.close
end

#mod_read(offset, len) ⇒ Object 



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# File 'lib/virt_disk/client_head.rb', line 48

def mod_read(offset, len)
  @up_stream_module.mod_read(offset, len)
end

#mod_write(offset, buffer, len) ⇒ Object 



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# File 'lib/virt_disk/client_head.rb', line 52

def mod_write(offset, buffer, len)
  @up_stream_module.mod_write(offset, buffer, len)
end

#read(len) ⇒ Object 



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# File 'lib/virt_disk/client_head.rb', line 36

def read(len)
  rb = mod_read(@seek_pos, len)
  @seek_pos += rb.length unless rb.nil?
  rb
end

#seek(amt, whence = IO::SEEK_SET) ⇒ Object 



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# File 'lib/virt_disk/client_head.rb', line 24

def seek(amt, whence = IO::SEEK_SET)
  case whence
  when IO::SEEK_CUR
    @seek_pos += amt
  when IO::SEEK_END
    @seek_pos = @endByteAddr + amt
  when IO::SEEK_SET
    @seek_pos = amt + @start_byte_addr
  end
  @seek_pos
end

#write(buf, len) ⇒ Object 



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# File 'lib/virt_disk/client_head.rb', line 42

def write(buf, len)
  nbytes = @up_stream_module.mod_write(@seek_pos, buf, len)
  @seek_pos += nbytes
  nbytes
end