blob: d7390b1ea2eb6fc1b119967b7ff5d2718528a15c (
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|
begin
require 'mmap'
rescue LoadError
module Git module Raw module Internal
class Mmap
def initialize(file)
@file = file
@offset = nil
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)
end
@offset = offset + len ? len : 1
if not len
@file.read(1)[0]
else
@file.read(len)
end
end
end
end end
end # rescue LoadError
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