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e798ccbacf
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30599 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
112 lines
2.3 KiB
Ruby
112 lines
2.3 KiB
Ruby
######################################################################
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# This file is imported from the rubygems project.
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# DO NOT make modifications in this repo. They _will_ be reverted!
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# File a patch instead and assign it to Ryan Davis or Eric Hodel.
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######################################################################
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# -*- coding: utf-8 -*-
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#--
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# Copyright (C) 2004 Mauricio Julio Fernández Pradier
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# See LICENSE.txt for additional licensing information.
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#++
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##
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# TarReader reads tar files and allows iteration over their items
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class Gem::Package::TarReader
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include Gem::Package
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##
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# Raised if the tar IO is not seekable
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class UnexpectedEOF < StandardError; end
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##
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# Creates a new TarReader on +io+ and yields it to the block, if given.
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def self.new(io)
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reader = super
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return reader unless block_given?
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begin
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yield reader
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ensure
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reader.close
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end
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nil
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end
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##
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# Creates a new tar file reader on +io+ which needs to respond to #pos,
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# #eof?, #read, #getc and #pos=
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def initialize(io)
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@io = io
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@init_pos = io.pos
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end
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##
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# Close the tar file
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def close
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end
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##
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# Iterates over files in the tarball yielding each entry
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def each
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loop do
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return if @io.eof?
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header = Gem::Package::TarHeader.from @io
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return if header.empty?
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entry = Gem::Package::TarReader::Entry.new header, @io
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size = entry.header.size
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yield entry
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skip = (512 - (size % 512)) % 512
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pending = size - entry.bytes_read
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begin
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# avoid reading...
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@io.seek pending, IO::SEEK_CUR
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pending = 0
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rescue Errno::EINVAL, NameError
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while pending > 0 do
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bytes_read = @io.read([pending, 4096].min).size
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raise UnexpectedEOF if @io.eof?
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pending -= bytes_read
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end
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end
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@io.read skip # discard trailing zeros
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# make sure nobody can use #read, #getc or #rewind anymore
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entry.close
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end
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end
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alias each_entry each
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##
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# NOTE: Do not call #rewind during #each
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def rewind
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if @init_pos == 0 then
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raise Gem::Package::NonSeekableIO unless @io.respond_to? :rewind
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@io.rewind
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else
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raise Gem::Package::NonSeekableIO unless @io.respond_to? :pos=
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@io.pos = @init_pos
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end
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end
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end
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require 'rubygems/package/tar_reader/entry'
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