# File lib/grit/git-ruby/internal/file_window.rb, line 16
16:         def initialize(file, version = 1)
17:           @file = file
18:           @offset = nil
19:           if version == 2
20:             @global_offset = 8
21:           else
22:             @global_offset = 0
23:           end
24:         end

    # File lib/grit/git-ruby/internal/file_window.rb, line 30
30:         def [](*idx)
31:           idx = idx[0] if idx.length == 1
32:           case idx
33:           when Range
34:             offset = idx.first
35:             len = idx.last - idx.first + idx.exclude_end? ? 0 : 1
36:           when Fixnum
37:             offset = idx
38:             len = nil
39:           when Array
40:             offset, len = idx
41:           else
42:             raise RuntimeError, "invalid index param: #{idx.class}"
43:           end
44:           if @offset != offset
45:             @file.seek(offset + @global_offset)
46:           end
47:           @offset = offset + len ? len : 1
48:           if not len
49:             @file.read(1).getord(0)
50:           else
51:             @file.read(len)
52:           end
53:         end

    # File lib/grit/git-ruby/internal/file_window.rb, line 26
26:         def unmap
27:           @file = nil
28:         end