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File Manager

Path: /opt/cpanel/ea-ruby27/root/usr/share/ruby/ruby-2.7.8/rubygems/package/tar_reader/

Viewing File: entry.rb

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

##
# Class for reading entries out of a tar file

class Gem::Package::TarReader::Entry

  ##
  # Header for this tar entry

  attr_reader :header

  ##
  # Creates a new tar entry for +header+ that will be read from +io+

  def initialize(header, io)
    @closed = false
    @header = header
    @io = io
    @orig_pos = @io.pos
    @read = 0
  end

  def check_closed # :nodoc:
    raise IOError, "closed #{self.class}" if closed?
  end

  ##
  # Number of bytes read out of the tar entry

  def bytes_read
    @read
  end

  ##
  # Closes the tar entry

  def close
    @closed = true
  end

  ##
  # Is the tar entry closed?

  def closed?
    @closed
  end

  ##
  # Are we at the end of the tar entry?

  def eof?
    check_closed

    @read >= @header.size
  end

  ##
  # Full name of the tar entry

  def full_name
    if @header.prefix != ""
      File.join @header.prefix, @header.name
    else
      @header.name
    end
  rescue ArgumentError => e
    raise unless e.message == 'string contains null byte'
    raise Gem::Package::TarInvalidError,
          'tar is corrupt, name contains null byte'
  end

  ##
  # Read one byte from the tar entry

  def getc
    check_closed

    return nil if @read >= @header.size

    ret = @io.getc
    @read += 1 if ret

    ret
  end

  ##
  # Is this tar entry a directory?

  def directory?
    @header.typeflag == "5"
  end

  ##
  # Is this tar entry a file?

  def file?
    @header.typeflag == "0"
  end

  ##
  # Is this tar entry a symlink?

  def symlink?
    @header.typeflag == "2"
  end

  ##
  # The position in the tar entry

  def pos
    check_closed

    bytes_read
  end

  def size
    @header.size
  end

  alias length size

  ##
  # Reads +len+ bytes from the tar file entry, or the rest of the entry if
  # nil

  def read(len = nil)
    check_closed

    return nil if @read >= @header.size

    len ||= @header.size - @read
    max_read = [len, @header.size - @read].min

    ret = @io.read max_read
    @read += ret.size

    ret
  end

  def readpartial(maxlen = nil, outbuf = "".b)
    check_closed

    raise EOFError if @read >= @header.size

    maxlen ||= @header.size - @read
    max_read = [maxlen, @header.size - @read].min

    @io.readpartial(max_read, outbuf)
    @read += outbuf.size

    outbuf
  end

  ##
  # Rewinds to the beginning of the tar file entry

  def rewind
    check_closed

    @io.pos = @orig_pos
    @read = 0
  end

end