Checkout of Instiki Trunk 1/21/2007.

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

@@ -0,0 +1,155 @@
+module IOExtras  #:nodoc:
+
+  CHUNK_SIZE = 32768
+
+  RANGE_ALL = 0..-1
+
+  def self.copy_stream(ostream, istream)
+    s = ''
+    ostream.write(istream.read(CHUNK_SIZE, s)) until istream.eof? 
+  end
+
+
+  # Implements kind_of? in order to pretend to be an IO object
+  module FakeIO
+    def kind_of?(object)
+      object == IO || super
+    end
+  end
+
+  # Implements many of the convenience methods of IO
+  # such as gets, getc, readline and readlines 
+  # depends on: input_finished?, produce_input and read
+  module AbstractInputStream  
+    include Enumerable
+    include FakeIO
+
+    def initialize
+      super
+      @lineno = 0
+      @outputBuffer = ""
+    end
+
+    attr_accessor :lineno
+
+    def read(numberOfBytes = nil, buf = nil)
+      tbuf = nil
+
+      if @outputBuffer.length > 0
+        if numberOfBytes <= @outputBuffer.length
+          tbuf = @outputBuffer.slice!(0, numberOfBytes)
+        else
+          numberOfBytes -= @outputBuffer.length if (numberOfBytes)
+          rbuf = sysread(numberOfBytes, buf)
+          tbuf = @outputBuffer
+          tbuf << rbuf if (rbuf)
+          @outputBuffer = ""
+        end
+      else
+        tbuf = sysread(numberOfBytes, buf)
+      end
+
+      return nil unless (tbuf)
+
+      if buf
+        buf.replace(tbuf)
+      else
+        buf = tbuf
+      end
+
+      buf
+    end
+
+    def readlines(aSepString = $/)
+      retVal = []
+      each_line(aSepString) { |line| retVal << line }
+      return retVal
+    end
+    
+    def gets(aSepString=$/)
+      @lineno = @lineno.next
+      return read if aSepString == nil
+      aSepString="#{$/}#{$/}" if aSepString == ""
+      
+      bufferIndex=0
+      while ((matchIndex = @outputBuffer.index(aSepString, bufferIndex)) == nil)
+	bufferIndex=@outputBuffer.length
+	if input_finished?
+	  return @outputBuffer.empty? ? nil : flush 
+	end
+	@outputBuffer << produce_input
+      end
+      sepIndex=matchIndex + aSepString.length
+      return @outputBuffer.slice!(0...sepIndex)
+    end
+    
+    def flush
+      retVal=@outputBuffer
+      @outputBuffer=""
+      return retVal
+    end
+    
+    def readline(aSepString = $/)
+      retVal = gets(aSepString)
+      raise EOFError if retVal == nil
+      return retVal
+    end
+    
+    def each_line(aSepString = $/)
+      while true
+	yield readline(aSepString)
+      end
+    rescue EOFError
+    end
+    
+    alias_method :each, :each_line
+  end
+
+
+  # Implements many of the output convenience methods of IO.
+  # relies on <<
+  module AbstractOutputStream 
+    include FakeIO
+
+    def write(data)
+      self << data
+      data.to_s.length
+    end
+
+
+    def print(*params)
+      self << params.to_s << $\.to_s
+    end
+
+    def printf(aFormatString, *params)
+      self << sprintf(aFormatString, *params)
+    end
+
+    def putc(anObject)
+      self << case anObject
+	      when Fixnum then anObject.chr
+	      when String then anObject
+	      else raise TypeError, "putc: Only Fixnum and String supported"
+	      end
+      anObject
+    end
+    
+    def puts(*params)
+      params << "\n" if params.empty?
+      params.flatten.each {
+	|element|
+	val = element.to_s
+	self << val
+	self << "\n" unless val[-1,1] == "\n"
+      }
+    end
+
+  end
+
+end # IOExtras namespace module
+
+
+
+# Copyright (C) 2002-2004 Thomas Sondergaard
+# rubyzip is free software; you can redistribute it and/or
+# modify it under the terms of the ruby license.