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File Name : tar_reader.rb

# -*- coding: utf-8 -*-
# frozen_string_literal: true
#--
# Copyright (C) 2004 Mauricio Julio Fernández Pradier
# See LICENSE.txt for additional licensing information.
#++

##
# TarReader reads tar files and allows iteration over their items

class Gem::Package::TarReader

include Enumerable

##
  # Raised if the tar IO is not seekable

class UnexpectedEOF < StandardError; end

##
  # Creates a new TarReader on +io+ and yields it to the block, if given.

def self.new(io)
    reader = super

return reader unless block_given?

begin
      yield reader
    ensure
      reader.close
    end

nil
  end

##
  # Creates a new tar file reader on +io+ which needs to respond to #pos,
  # #eof?, #read, #getc and #pos=

def initialize(io)
    @io = io
    @init_pos = io.pos
  end

##
  # Close the tar file

def close
  end

##
  # Iterates over files in the tarball yielding each entry

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
        # 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

##
  # Seeks through the tar file until it finds the +entry+ with +name+ and
  # yields it.  Rewinds the tar file to the beginning when the block
  # terminates.

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'

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2025-11-16 11:28:34
..	dir	-	0755	2025-11-16 11:28:34
tar_reader	dir	-	0755	2025-11-16 11:28:34
digest_io.rb	file	1.33 KB	0644	2016-08-24 03:28:23
file_source.rb	file	599 B	0644	2016-08-24 03:28:23
io_source.rb	file	769 B	0644	2016-08-24 03:28:23
old.rb	file	3.86 KB	0644	2017-11-30 02:29:32
source.rb	file	72 B	0644	2016-08-24 03:28:23
tar_header.rb	file	5.52 KB	0644	2018-02-16 04:21:44
tar_reader.rb	file	2.39 KB	0644	2016-08-24 03:28:23
tar_test_case.rb	file	3.85 KB	0644	2016-08-24 03:28:23
tar_writer.rb	file	7.43 KB	0644	2018-02-16 04:21:44