123 lines
3.6 KiB
Java
123 lines
3.6 KiB
Java
/*
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* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.internal.util.xml.impl;
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import java.io.Reader;
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import java.io.InputStream;
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import java.io.IOException;
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/**
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* UTF-16 encoded stream reader.
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*/
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public class ReaderUTF16 extends Reader {
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private InputStream is;
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private char bo;
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/**
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* Constructor.
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*
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* Byte order argument can be: 'l' for little-endian or 'b' for big-endian.
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*
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* @param is A byte input stream.
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* @param bo A byte order in the input stream.
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*/
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public ReaderUTF16(InputStream is, char bo) {
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switch (bo) {
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case 'l':
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break;
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case 'b':
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break;
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default:
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throw new IllegalArgumentException("");
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}
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this.bo = bo;
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this.is = is;
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}
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/**
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* Reads characters into a portion of an array.
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*
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* @param cbuf Destination buffer.
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* @param off Offset at which to start storing characters.
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* @param len Maximum number of characters to read.
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* @exception IOException If any IO errors occur.
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*/
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public int read(char[] cbuf, int off, int len) throws IOException {
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int num = 0;
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int val;
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if (bo == 'b') {
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while (num < len) {
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if ((val = is.read()) < 0) {
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return (num != 0) ? num : -1;
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}
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cbuf[off++] = (char) ((val << 8) | (is.read() & 0xff));
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num++;
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}
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} else {
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while (num < len) {
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if ((val = is.read()) < 0) {
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return (num != 0) ? num : -1;
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}
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cbuf[off++] = (char) ((is.read() << 8) | (val & 0xff));
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num++;
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}
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}
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return num;
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}
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/**
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* Reads a single character.
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*
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* @return The character read, as an integer in the range 0 to 65535
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* (0x0000-0xffff), or -1 if the end of the stream has been reached.
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* @exception IOException If any IO errors occur.
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*/
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public int read() throws IOException {
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int val;
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if ((val = is.read()) < 0) {
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return -1;
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}
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if (bo == 'b') {
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val = (char) ((val << 8) | (is.read() & 0xff));
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} else {
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val = (char) ((is.read() << 8) | (val & 0xff));
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}
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return val;
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}
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/**
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* Closes the stream.
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*
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* @exception IOException If any IO errors occur.
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*/
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public void close() throws IOException {
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is.close();
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}
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}
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