2007-03-27 Roman Kennke <roman@kennke.org>

	* java/io/InputStreamReader.java
	(BUFFER_SIZE): New constant.
	(bytesCache): Removed.
	(cacheLock): Removed.
	(hasSavedSurrogate): Removed.
	(lastArray): New field. Used for caching CharBuffers.
	(lastBuffer): New field. Used for caching CharBuffers.
	(maxBytesPerChar): Removed.
	(oneChar): New field. Caches a char array for read().
	(savedSurrogate): New field.
	(InputStreamReader): (all constructors) Cleaned up.
	Use initDecoderAndBuffer() method. Check for null parameters.
	Use new EncodingHelper.getDefaultCharset() for fetching the
	default charset.
	(decode): New helper method. Decodes using the NIO decoder or
	using a raw Latin1 decoding.
	(getCharBuffer): New helper method. Implements caching of
	CharBuffers for output arrays.
	(initDecoderAndBuffer): New helper method. Initializes the decoder
	and input buffer.
	(read): Use cached array.
	(read(char[],int,int)): Reworked using a cleaner NIO based
	implementation. This decodes the incoming data in bigger chunks
	rather then calling the decoder for each character.
	(ready): Also check the input buffer.
	(refillInputBuffer): New helper methods. Refills the input buffer
	when it runs out of data.
	* java/io/OutputStreamWriter.java
	(lastArray): Implements caching of the output array buffer.
	(lastBuffer): Implements caching of the output array buffer.
	(oneChar): New field. Caches a char array for write().
	(outputBuffer): Make this a ByteBuffer.
	(OutputStreamWriter): (all constructors) Cleaned up.
	Use initEncoderAndBuffer() method. Check for null parameters.
	Use new EncodingHelper.getDefaultCharset() for fetching the
	default charset.
	(encode): New helper method. Encodes the input buffer to the output
	buffer using either the NIO encoder or a raw Latin1 encoding.
	(encodeChars): New helper method. The encoding loop.
	(flush): Directly use the array of the output buffer.
	(getCharBuffer): New helper method. Implements caching of the
	output buffer.
	(initEncoderAndBuffer): New helper method for initialization.
	(write(char[],int,int)): Reworked to make better use of the NIO
	encoders.
	(write): Use cached array.
	(write(String,int,int)): Don't copy the string but rather wrap it
	and handle it the same as the wrapped char array.
	(writeConvert): Removed.
	* gnu/java/nio/charset/EncodingHelper.java
	(getDefaultCharset): New method. Returns the default charset for
	the case when the file.encoding charset is not valid. This
	always returns an UTF8 codec.

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