Current File : /opt/alt/ruby20/lib64/ruby/2.0.0/rubygems/package/tar_reader//entry.rb
# -*- coding: utf-8 -*-
#++
# 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 != "" then
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
##
# The position in the tar entry
def pos
check_closed
bytes_read
end
##
# 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
##
# Rewinds to the beginning of the tar file entry
def rewind
check_closed
raise Gem::Package::NonSeekableIO unless @io.respond_to? :pos=
@io.pos = @orig_pos
@read = 0
end
end
