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Direktori : /opt/alt/ruby21/lib64/ruby/2.1.0/rubygems/package/tar_reader/ |
Current File : //opt/alt/ruby21/lib64/ruby/2.1.0/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