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#++
# Copyright (C) 2004 Mauricio Julio Fernández Pradier
# See LICENSE.txt for additional licensing information.
#--
require 'rubygems/package'
class Gem::Package::TarReader
include Gem::Package
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
loop do
return if @io.eof?
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
# avoid reading...
@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 # discard trailing zeros
# make sure nobody can use #read, #getc or #rewind anymore
entry.close
end
end
alias each_entry each
##
# NOTE: Do not call #rewind during #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
end
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