class Gem::Package::TarReader
include Enumerable
class UnexpectedEOF < StandardError; end
def self.new(io)
reader = super
return reader unless block_given?
begin
yield reader
ensure
reader.close
end
nil
end
def initialize(io)
@io = io
@init_pos = io.pos
end
def close
end
def each
return enum_for __method__ unless block_given?
until @io.eof? do
header = Gem::Package::TarHeader.from @io
return if header.empty?
entry = Gem::Package::TarReader::Entry.new header, @io
size = entry.header.size
yield entry
skip = (512 - (size % 512)) % 512
pending = size - entry.bytes_read
begin
@io.seek pending, IO::SEEK_CUR
pending = 0
rescue Errno::EINVAL, NameError
while pending > 0 do
bytes_read = @io.read([pending, 4096].min).size
raise UnexpectedEOF if @io.eof?
pending -= bytes_read
end
end
@io.read skip
entry.close
end
end
alias each_entry each
def rewind
if @init_pos == 0 then
raise Gem::Package::NonSeekableIO unless @io.respond_to? :rewind
@io.rewind
else
raise Gem::Package::NonSeekableIO unless @io.respond_to? :pos=
@io.pos = @init_pos
end
end
def seek name # :yields: entry
found = find do |entry|
entry.full_name == name
end
return unless found
return yield found
ensure
rewind
end
end
require 'rubygems/package/tar_reader/entry'