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#
# converted from the gitrb project
#
# authors:
# Matthias Lederhofer <matled@gmx.net>
# Simon 'corecode' Schubert <corecode@fs.ei.tum.de>
# Scott Chacon <schacon@gmail.com>
#
# provides native ruby access to git objects and pack files
#
module Grit
module GitRuby
module Internal
class FileWindow
def initialize(file, version = 1)
@file = file
@offset = nil
if version == 2
@global_offset = 8
else
@global_offset = 0
end
end
def unmap
@file = nil
end
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).getord(0)
else
@file.read(len)
end
end
end
end
end
end
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