toString_string(charsetName) {
			return new String(this.buf /*, 0, this.count, charsetName*/).toString();
		}
Converts the buffer's contents into a string by decoding the bytes using
the specified {@link java.nio.charset.Charset charsetName}. The length of
the new <tt>String</tt> is a function of the charset, and hence may not be
equal to the length of the byte array.

<p> This method always replaces malformed-input and unmappable-character
sequences with this charset's default replacement string. The {@link
java.nio.charset.CharsetDecoder} class should be used when more control
over the decoding process is required.

@param  charsetName  the name of a supported
             {@linkplain java.nio.charset.Charset </code>charset<code>}
@return String decoded from the buffer's contents.
@exception  UnsupportedEncodingException
            If the named charset is not supported
@since   JDK1.1