Checkout of Instiki Trunk 1/21/2007.

vendor/plugins/rubyzip-0.9.1/lib/zip/tempfile_bugfixed.rb

@@ -0,0 +1,195 @@
+#
+# tempfile - manipulates temporary files
+#
+# $Id: tempfile_bugfixed.rb,v 1.2 2005/02/19 20:30:33 thomas Exp $
+#
+
+require 'delegate'
+require 'tmpdir'
+
+module BugFix  #:nodoc:all
+
+# A class for managing temporary files.  This library is written to be
+# thread safe.
+class Tempfile < DelegateClass(File)
+  MAX_TRY = 10
+  @@cleanlist = []
+
+  # Creates a temporary file of mode 0600 in the temporary directory
+  # whose name is basename.pid.n and opens with mode "w+".  A Tempfile
+  # object works just like a File object.
+  #
+  # If tmpdir is omitted, the temporary directory is determined by
+  # Dir::tmpdir provided by 'tmpdir.rb'.
+  # When $SAFE > 0 and the given tmpdir is tainted, it uses
+  # /tmp. (Note that ENV values are tainted by default)
+  def initialize(basename, tmpdir=Dir::tmpdir)
+    if $SAFE > 0 and tmpdir.tainted?
+      tmpdir = '/tmp'
+    end
+
+    lock = nil
+    n = failure = 0
+    
+    begin
+      Thread.critical = true
+
+      begin
+	tmpname = sprintf('%s/%s%d.%d', tmpdir, basename, $$, n)
+	lock = tmpname + '.lock'
+	n += 1
+      end while @@cleanlist.include?(tmpname) or
+	File.exist?(lock) or File.exist?(tmpname)
+
+      Dir.mkdir(lock)
+    rescue
+      failure += 1
+      retry if failure < MAX_TRY
+      raise "cannot generate tempfile `%s'" % tmpname
+    ensure
+      Thread.critical = false
+    end
+
+    @data = [tmpname]
+    @clean_proc = Tempfile.callback(@data)
+    ObjectSpace.define_finalizer(self, @clean_proc)
+
+    @tmpfile = File.open(tmpname, File::RDWR|File::CREAT|File::EXCL, 0600)
+    @tmpname = tmpname
+    @@cleanlist << @tmpname
+    @data[1] = @tmpfile
+    @data[2] = @@cleanlist
+
+    super(@tmpfile)
+
+    # Now we have all the File/IO methods defined, you must not
+    # carelessly put bare puts(), etc. after this.
+
+    Dir.rmdir(lock)
+  end
+
+  # Opens or reopens the file with mode "r+".
+  def open
+    @tmpfile.close if @tmpfile
+    @tmpfile = File.open(@tmpname, 'r+')
+    @data[1] = @tmpfile
+    __setobj__(@tmpfile)
+  end
+
+  def _close	# :nodoc:
+    @tmpfile.close if @tmpfile
+    @data[1] = @tmpfile = nil
+  end    
+  protected :_close
+
+  # Closes the file.  If the optional flag is true, unlinks the file
+  # after closing.
+  #
+  # If you don't explicitly unlink the temporary file, the removal
+  # will be delayed until the object is finalized.
+  def close(unlink_now=false)
+    if unlink_now
+      close!
+    else
+      _close
+    end
+  end
+
+  # Closes and unlinks the file.
+  def close!
+    _close
+    @clean_proc.call
+    ObjectSpace.undefine_finalizer(self)
+  end
+
+  # Unlinks the file.  On UNIX-like systems, it is often a good idea
+  # to unlink a temporary file immediately after creating and opening
+  # it, because it leaves other programs zero chance to access the
+  # file.
+  def unlink
+    # keep this order for thread safeness
+    File.unlink(@tmpname) if File.exist?(@tmpname)
+    @@cleanlist.delete(@tmpname) if @@cleanlist
+  end
+  alias delete unlink
+
+  if RUBY_VERSION > '1.8.0'
+    def __setobj__(obj)
+      @_dc_obj = obj
+    end
+  else
+    def __setobj__(obj)
+      @obj = obj
+    end
+  end
+
+  # Returns the full path name of the temporary file.
+  def path
+    @tmpname
+  end
+
+  # Returns the size of the temporary file.  As a side effect, the IO
+  # buffer is flushed before determining the size.
+  def size
+    if @tmpfile
+      @tmpfile.flush
+      @tmpfile.stat.size
+    else
+      0
+    end
+  end
+  alias length size
+
+  class << self
+    def callback(data)	# :nodoc:
+      pid = $$
+      lambda{
+	if pid == $$ 
+	  path, tmpfile, cleanlist = *data
+
+	  print "removing ", path, "..." if $DEBUG
+
+	  tmpfile.close if tmpfile
+
+	  # keep this order for thread safeness
+	  File.unlink(path) if File.exist?(path)
+	  cleanlist.delete(path) if cleanlist
+
+	  print "done\n" if $DEBUG
+	end
+      }
+    end
+
+    # If no block is given, this is a synonym for new().
+    #
+    # If a block is given, it will be passed tempfile as an argument,
+    # and the tempfile will automatically be closed when the block
+    # terminates.  In this case, open() returns nil.
+    def open(*args)
+      tempfile = new(*args)
+
+      if block_given?
+	begin
+	  yield(tempfile)
+	ensure
+	  tempfile.close
+	end
+
+	nil
+      else
+	tempfile
+      end
+    end
+  end
+end
+
+end # module BugFix
+if __FILE__ == $0
+#  $DEBUG = true
+  f = Tempfile.new("foo")
+  f.print("foo\n")
+  f.close
+  f.open
+  p f.gets # => "foo\n"
+  f.close!
+end