Class: GitStore::Mmap

Inherits:
Object
  • Object
show all
Defined in:
lib/git_store/pack.rb

Instance Method Summary collapse

Constructor Details

#initialize(file, version = 1) ⇒ Mmap

Returns a new instance of Mmap.



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# File 'lib/git_store/pack.rb', line 27

def initialize(file, version = 1)
  @file = file
  @offset = nil
  if version == 2
    @global_offset = 8
  else
    @global_offset = 0
  end
end

Instance Method Details

#[](*idx) ⇒ Object 



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# File 'lib/git_store/pack.rb', line 41

def [](*idx)
  idx = idx[0] if idx.length == 1
  case idx
  when Range
    offset = idx.first
    len = idx.last - idx.first + idx.exclude_end? ? 0 : 1
  when Fixnum
    offset = idx
    len = nil
  when Array
    offset, len = idx
  else
    raise RuntimeError, "invalid index param: #{idx.class}"
  end
  if @offset != offset
    @file.seek(offset + @global_offset)
  end
  @offset = offset + len ? len : 1
  if not len
    @file.read(1)[0]
  else
    @file.read(len)
  end
end

#unmap ⇒ Object 



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# File 'lib/git_store/pack.rb', line 37

def unmap
  @file = nil
end