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/*
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* Copyright (c) 1994, 2006, 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 java.io;
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import org.apidesign.bck2brwsr.core.JavaScriptBody;
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import org.apidesign.bck2brwsr.emul.lang.System;
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/**
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* A data input stream lets an application read primitive Java data
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* types from an underlying input stream in a machine-independent
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* way. An application uses a data output stream to write data that
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* can later be read by a data input stream.
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* <p>
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* DataInputStream is not necessarily safe for multithreaded access.
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* Thread safety is optional and is the responsibility of users of
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* methods in this class.
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*
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* @author Arthur van Hoff
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* @see java.io.DataOutputStream
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* @since JDK1.0
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*/
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public
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class DataInputStream extends FilterInputStream implements DataInput {
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/**
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* Creates a DataInputStream that uses the specified
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* underlying InputStream.
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*
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* @param in the specified input stream
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*/
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public DataInputStream(InputStream in) {
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super(in);
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}
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/**
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* working arrays initialized on demand by readUTF
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*/
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private byte bytearr[] = new byte[80];
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private char chararr[] = new char[80];
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/**
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* Reads some number of bytes from the contained input stream and
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* stores them into the buffer array <code>b</code>. The number of
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* bytes actually read is returned as an integer. This method blocks
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* until input data is available, end of file is detected, or an
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* exception is thrown.
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*
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* <p>If <code>b</code> is null, a <code>NullPointerException</code> is
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* thrown. If the length of <code>b</code> is zero, then no bytes are
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* read and <code>0</code> is returned; otherwise, there is an attempt
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* to read at least one byte. If no byte is available because the
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* stream is at end of file, the value <code>-1</code> is returned;
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* otherwise, at least one byte is read and stored into <code>b</code>.
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*
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* <p>The first byte read is stored into element <code>b[0]</code>, the
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* next one into <code>b[1]</code>, and so on. The number of bytes read
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* is, at most, equal to the length of <code>b</code>. Let <code>k</code>
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* be the number of bytes actually read; these bytes will be stored in
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* elements <code>b[0]</code> through <code>b[k-1]</code>, leaving
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* elements <code>b[k]</code> through <code>b[b.length-1]</code>
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* unaffected.
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*
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* <p>The <code>read(b)</code> method has the same effect as:
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* <blockquote><pre>
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* read(b, 0, b.length)
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* </pre></blockquote>
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*
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* @param b the buffer into which the data is read.
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* @return the total number of bytes read into the buffer, or
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* <code>-1</code> if there is no more data because the end
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* of the stream has been reached.
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* @exception IOException if the first byte cannot be read for any reason
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* other than end of file, the stream has been closed and the underlying
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* input stream does not support reading after close, or another I/O
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* error occurs.
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* @see java.io.FilterInputStream#in
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* @see java.io.InputStream#read(byte[], int, int)
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*/
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public final int read(byte b[]) throws IOException {
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return in.read(b, 0, b.length);
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}
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/**
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* Reads up to <code>len</code> bytes of data from the contained
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* input stream into an array of bytes. An attempt is made to read
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* as many as <code>len</code> bytes, but a smaller number may be read,
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* possibly zero. The number of bytes actually read is returned as an
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* integer.
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*
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* <p> This method blocks until input data is available, end of file is
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* detected, or an exception is thrown.
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*
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* <p> If <code>len</code> is zero, then no bytes are read and
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* <code>0</code> is returned; otherwise, there is an attempt to read at
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* least one byte. If no byte is available because the stream is at end of
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* file, the value <code>-1</code> is returned; otherwise, at least one
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* byte is read and stored into <code>b</code>.
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*
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* <p> The first byte read is stored into element <code>b[off]</code>, the
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* next one into <code>b[off+1]</code>, and so on. The number of bytes read
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* is, at most, equal to <code>len</code>. Let <i>k</i> be the number of
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* bytes actually read; these bytes will be stored in elements
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* <code>b[off]</code> through <code>b[off+</code><i>k</i><code>-1]</code>,
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* leaving elements <code>b[off+</code><i>k</i><code>]</code> through
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* <code>b[off+len-1]</code> unaffected.
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*
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* <p> In every case, elements <code>b[0]</code> through
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* <code>b[off]</code> and elements <code>b[off+len]</code> through
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* <code>b[b.length-1]</code> are unaffected.
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*
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* @param b the buffer into which the data is read.
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* @param off the start offset in the destination array <code>b</code>
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* @param len the maximum number of bytes read.
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* @return the total number of bytes read into the buffer, or
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* <code>-1</code> if there is no more data because the end
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* of the stream has been reached.
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* @exception NullPointerException If <code>b</code> is <code>null</code>.
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* @exception IndexOutOfBoundsException If <code>off</code> is negative,
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* <code>len</code> is negative, or <code>len</code> is greater than
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* <code>b.length - off</code>
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* @exception IOException if the first byte cannot be read for any reason
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* other than end of file, the stream has been closed and the underlying
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* input stream does not support reading after close, or another I/O
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* error occurs.
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* @see java.io.FilterInputStream#in
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* @see java.io.InputStream#read(byte[], int, int)
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*/
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public final int read(byte b[], int off, int len) throws IOException {
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return in.read(b, off, len);
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}
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/**
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* See the general contract of the <code>readFully</code>
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* method of <code>DataInput</code>.
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* <p>
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* Bytes
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* for this operation are read from the contained
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* input stream.
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*
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* @param b the buffer into which the data is read.
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* @exception EOFException if this input stream reaches the end before
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* reading all the bytes.
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* @exception IOException the stream has been closed and the contained
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* input stream does not support reading after close, or
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* another I/O error occurs.
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* @see java.io.FilterInputStream#in
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*/
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public final void readFully(byte b[]) throws IOException {
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readFully(b, 0, b.length);
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}
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/**
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* See the general contract of the <code>readFully</code>
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* method of <code>DataInput</code>.
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* <p>
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* Bytes
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* for this operation are read from the contained
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* input stream.
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*
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* @param b the buffer into which the data is read.
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* @param off the start offset of the data.
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* @param len the number of bytes to read.
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* @exception EOFException if this input stream reaches the end before
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* reading all the bytes.
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* @exception IOException the stream has been closed and the contained
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* input stream does not support reading after close, or
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* another I/O error occurs.
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* @see java.io.FilterInputStream#in
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*/
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public final void readFully(byte b[], int off, int len) throws IOException {
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if (len < 0)
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throw new IndexOutOfBoundsException();
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int n = 0;
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while (n < len) {
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int count = in.read(b, off + n, len - n);
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if (count < 0)
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throw new EOFException();
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n += count;
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}
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}
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/**
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* See the general contract of the <code>skipBytes</code>
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* method of <code>DataInput</code>.
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* <p>
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* Bytes for this operation are read from the contained
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* input stream.
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*
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* @param n the number of bytes to be skipped.
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* @return the actual number of bytes skipped.
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* @exception IOException if the contained input stream does not support
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* seek, or the stream has been closed and
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* the contained input stream does not support
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* reading after close, or another I/O error occurs.
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*/
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public final int skipBytes(int n) throws IOException {
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int total = 0;
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int cur = 0;
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while ((total<n) && ((cur = (int) in.skip(n-total)) > 0)) {
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total += cur;
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}
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return total;
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}
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/**
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* See the general contract of the <code>readBoolean</code>
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* method of <code>DataInput</code>.
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* <p>
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* Bytes for this operation are read from the contained
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* input stream.
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*
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* @return the <code>boolean</code> value read.
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* @exception EOFException if this input stream has reached the end.
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* @exception IOException the stream has been closed and the contained
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* input stream does not support reading after close, or
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* another I/O error occurs.
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* @see java.io.FilterInputStream#in
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*/
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public final boolean readBoolean() throws IOException {
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int ch = in.read();
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if (ch < 0)
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throw new EOFException();
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return (ch != 0);
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}
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/**
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* See the general contract of the <code>readByte</code>
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* method of <code>DataInput</code>.
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* <p>
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* Bytes
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* for this operation are read from the contained
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* input stream.
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*
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* @return the next byte of this input stream as a signed 8-bit
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* <code>byte</code>.
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* @exception EOFException if this input stream has reached the end.
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* @exception IOException the stream has been closed and the contained
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* input stream does not support reading after close, or
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* another I/O error occurs.
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* @see java.io.FilterInputStream#in
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*/
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public final byte readByte() throws IOException {
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int ch = in.read();
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if (ch < 0)
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throw new EOFException();
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return (byte)(ch);
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}
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/**
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* See the general contract of the <code>readUnsignedByte</code>
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* method of <code>DataInput</code>.
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* <p>
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* Bytes
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* for this operation are read from the contained
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* input stream.
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*
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* @return the next byte of this input stream, interpreted as an
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* unsigned 8-bit number.
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* @exception EOFException if this input stream has reached the end.
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|
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* @exception IOException the stream has been closed and the contained
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* input stream does not support reading after close, or
|
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* another I/O error occurs.
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* @see java.io.FilterInputStream#in
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*/
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|
290 |
public final int readUnsignedByte() throws IOException {
|
jtulach@146
|
291 |
int ch = in.read();
|
jtulach@146
|
292 |
if (ch < 0)
|
jtulach@146
|
293 |
throw new EOFException();
|
jtulach@146
|
294 |
return ch;
|
jtulach@146
|
295 |
}
|
jtulach@146
|
296 |
|
jtulach@146
|
297 |
/**
|
jtulach@146
|
298 |
* See the general contract of the <code>readShort</code>
|
jtulach@146
|
299 |
* method of <code>DataInput</code>.
|
jtulach@146
|
300 |
* <p>
|
jtulach@146
|
301 |
* Bytes
|
jtulach@146
|
302 |
* for this operation are read from the contained
|
jtulach@146
|
303 |
* input stream.
|
jtulach@146
|
304 |
*
|
jtulach@146
|
305 |
* @return the next two bytes of this input stream, interpreted as a
|
jtulach@146
|
306 |
* signed 16-bit number.
|
jtulach@146
|
307 |
* @exception EOFException if this input stream reaches the end before
|
jtulach@146
|
308 |
* reading two bytes.
|
jtulach@146
|
309 |
* @exception IOException the stream has been closed and the contained
|
jtulach@146
|
310 |
* input stream does not support reading after close, or
|
jtulach@146
|
311 |
* another I/O error occurs.
|
jtulach@146
|
312 |
* @see java.io.FilterInputStream#in
|
jtulach@146
|
313 |
*/
|
jtulach@146
|
314 |
public final short readShort() throws IOException {
|
jtulach@146
|
315 |
int ch1 = in.read();
|
jtulach@146
|
316 |
int ch2 = in.read();
|
jtulach@146
|
317 |
if ((ch1 | ch2) < 0)
|
jtulach@146
|
318 |
throw new EOFException();
|
jtulach@146
|
319 |
return (short)((ch1 << 8) + (ch2 << 0));
|
jtulach@146
|
320 |
}
|
jtulach@146
|
321 |
|
jtulach@146
|
322 |
/**
|
jtulach@146
|
323 |
* See the general contract of the <code>readUnsignedShort</code>
|
jtulach@146
|
324 |
* method of <code>DataInput</code>.
|
jtulach@146
|
325 |
* <p>
|
jtulach@146
|
326 |
* Bytes
|
jtulach@146
|
327 |
* for this operation are read from the contained
|
jtulach@146
|
328 |
* input stream.
|
jtulach@146
|
329 |
*
|
jtulach@146
|
330 |
* @return the next two bytes of this input stream, interpreted as an
|
jtulach@146
|
331 |
* unsigned 16-bit integer.
|
jtulach@146
|
332 |
* @exception EOFException if this input stream reaches the end before
|
jtulach@146
|
333 |
* reading two bytes.
|
jtulach@146
|
334 |
* @exception IOException the stream has been closed and the contained
|
jtulach@146
|
335 |
* input stream does not support reading after close, or
|
jtulach@146
|
336 |
* another I/O error occurs.
|
jtulach@146
|
337 |
* @see java.io.FilterInputStream#in
|
jtulach@146
|
338 |
*/
|
jtulach@146
|
339 |
public final int readUnsignedShort() throws IOException {
|
jtulach@146
|
340 |
int ch1 = in.read();
|
jtulach@146
|
341 |
int ch2 = in.read();
|
jtulach@146
|
342 |
if ((ch1 | ch2) < 0)
|
jtulach@146
|
343 |
throw new EOFException();
|
jtulach@146
|
344 |
return (ch1 << 8) + (ch2 << 0);
|
jtulach@146
|
345 |
}
|
jtulach@146
|
346 |
|
jtulach@146
|
347 |
/**
|
jtulach@146
|
348 |
* See the general contract of the <code>readChar</code>
|
jtulach@146
|
349 |
* method of <code>DataInput</code>.
|
jtulach@146
|
350 |
* <p>
|
jtulach@146
|
351 |
* Bytes
|
jtulach@146
|
352 |
* for this operation are read from the contained
|
jtulach@146
|
353 |
* input stream.
|
jtulach@146
|
354 |
*
|
jtulach@146
|
355 |
* @return the next two bytes of this input stream, interpreted as a
|
jtulach@146
|
356 |
* <code>char</code>.
|
jtulach@146
|
357 |
* @exception EOFException if this input stream reaches the end before
|
jtulach@146
|
358 |
* reading two bytes.
|
jtulach@146
|
359 |
* @exception IOException the stream has been closed and the contained
|
jtulach@146
|
360 |
* input stream does not support reading after close, or
|
jtulach@146
|
361 |
* another I/O error occurs.
|
jtulach@146
|
362 |
* @see java.io.FilterInputStream#in
|
jtulach@146
|
363 |
*/
|
jtulach@146
|
364 |
public final char readChar() throws IOException {
|
jtulach@146
|
365 |
int ch1 = in.read();
|
jtulach@146
|
366 |
int ch2 = in.read();
|
jtulach@146
|
367 |
if ((ch1 | ch2) < 0)
|
jtulach@146
|
368 |
throw new EOFException();
|
jtulach@146
|
369 |
return (char)((ch1 << 8) + (ch2 << 0));
|
jtulach@146
|
370 |
}
|
jtulach@146
|
371 |
|
jtulach@146
|
372 |
/**
|
jtulach@146
|
373 |
* See the general contract of the <code>readInt</code>
|
jtulach@146
|
374 |
* method of <code>DataInput</code>.
|
jtulach@146
|
375 |
* <p>
|
jtulach@146
|
376 |
* Bytes
|
jtulach@146
|
377 |
* for this operation are read from the contained
|
jtulach@146
|
378 |
* input stream.
|
jtulach@146
|
379 |
*
|
jtulach@146
|
380 |
* @return the next four bytes of this input stream, interpreted as an
|
jtulach@146
|
381 |
* <code>int</code>.
|
jtulach@146
|
382 |
* @exception EOFException if this input stream reaches the end before
|
jtulach@146
|
383 |
* reading four bytes.
|
jtulach@146
|
384 |
* @exception IOException the stream has been closed and the contained
|
jtulach@146
|
385 |
* input stream does not support reading after close, or
|
jtulach@146
|
386 |
* another I/O error occurs.
|
jtulach@146
|
387 |
* @see java.io.FilterInputStream#in
|
jtulach@146
|
388 |
*/
|
jtulach@146
|
389 |
public final int readInt() throws IOException {
|
jtulach@146
|
390 |
int ch1 = in.read();
|
jtulach@146
|
391 |
int ch2 = in.read();
|
jtulach@146
|
392 |
int ch3 = in.read();
|
jtulach@146
|
393 |
int ch4 = in.read();
|
jtulach@146
|
394 |
if ((ch1 | ch2 | ch3 | ch4) < 0)
|
jtulach@146
|
395 |
throw new EOFException();
|
jtulach@146
|
396 |
return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0));
|
jtulach@146
|
397 |
}
|
jtulach@146
|
398 |
|
jtulach@146
|
399 |
private byte readBuffer[] = new byte[8];
|
jtulach@146
|
400 |
|
jtulach@146
|
401 |
/**
|
jtulach@146
|
402 |
* See the general contract of the <code>readLong</code>
|
jtulach@146
|
403 |
* method of <code>DataInput</code>.
|
jtulach@146
|
404 |
* <p>
|
jtulach@146
|
405 |
* Bytes
|
jtulach@146
|
406 |
* for this operation are read from the contained
|
jtulach@146
|
407 |
* input stream.
|
jtulach@146
|
408 |
*
|
jtulach@146
|
409 |
* @return the next eight bytes of this input stream, interpreted as a
|
jtulach@146
|
410 |
* <code>long</code>.
|
jtulach@146
|
411 |
* @exception EOFException if this input stream reaches the end before
|
jtulach@146
|
412 |
* reading eight bytes.
|
jtulach@146
|
413 |
* @exception IOException the stream has been closed and the contained
|
jtulach@146
|
414 |
* input stream does not support reading after close, or
|
jtulach@146
|
415 |
* another I/O error occurs.
|
jtulach@146
|
416 |
* @see java.io.FilterInputStream#in
|
jtulach@146
|
417 |
*/
|
jtulach@146
|
418 |
public final long readLong() throws IOException {
|
jtulach@146
|
419 |
readFully(readBuffer, 0, 8);
|
jtulach@146
|
420 |
return (((long)readBuffer[0] << 56) +
|
jtulach@146
|
421 |
((long)(readBuffer[1] & 255) << 48) +
|
jtulach@146
|
422 |
((long)(readBuffer[2] & 255) << 40) +
|
jtulach@146
|
423 |
((long)(readBuffer[3] & 255) << 32) +
|
jtulach@146
|
424 |
((long)(readBuffer[4] & 255) << 24) +
|
jtulach@146
|
425 |
((readBuffer[5] & 255) << 16) +
|
jtulach@146
|
426 |
((readBuffer[6] & 255) << 8) +
|
jtulach@146
|
427 |
((readBuffer[7] & 255) << 0));
|
jtulach@146
|
428 |
}
|
jtulach@146
|
429 |
|
jtulach@146
|
430 |
/**
|
jtulach@146
|
431 |
* See the general contract of the <code>readFloat</code>
|
jtulach@146
|
432 |
* method of <code>DataInput</code>.
|
jtulach@146
|
433 |
* <p>
|
jtulach@146
|
434 |
* Bytes
|
jtulach@146
|
435 |
* for this operation are read from the contained
|
jtulach@146
|
436 |
* input stream.
|
jtulach@146
|
437 |
*
|
jtulach@146
|
438 |
* @return the next four bytes of this input stream, interpreted as a
|
jtulach@146
|
439 |
* <code>float</code>.
|
jtulach@146
|
440 |
* @exception EOFException if this input stream reaches the end before
|
jtulach@146
|
441 |
* reading four bytes.
|
jtulach@146
|
442 |
* @exception IOException the stream has been closed and the contained
|
jtulach@146
|
443 |
* input stream does not support reading after close, or
|
jtulach@146
|
444 |
* another I/O error occurs.
|
jtulach@146
|
445 |
* @see java.io.DataInputStream#readInt()
|
jtulach@146
|
446 |
* @see java.lang.Float#intBitsToFloat(int)
|
jtulach@146
|
447 |
*/
|
jtulach@146
|
448 |
public final float readFloat() throws IOException {
|
jtulach@146
|
449 |
return Float.intBitsToFloat(readInt());
|
jtulach@146
|
450 |
}
|
jtulach@146
|
451 |
|
jtulach@146
|
452 |
/**
|
jtulach@146
|
453 |
* See the general contract of the <code>readDouble</code>
|
jtulach@146
|
454 |
* method of <code>DataInput</code>.
|
jtulach@146
|
455 |
* <p>
|
jtulach@146
|
456 |
* Bytes
|
jtulach@146
|
457 |
* for this operation are read from the contained
|
jtulach@146
|
458 |
* input stream.
|
jtulach@146
|
459 |
*
|
jtulach@146
|
460 |
* @return the next eight bytes of this input stream, interpreted as a
|
jtulach@146
|
461 |
* <code>double</code>.
|
jtulach@146
|
462 |
* @exception EOFException if this input stream reaches the end before
|
jtulach@146
|
463 |
* reading eight bytes.
|
jtulach@146
|
464 |
* @exception IOException the stream has been closed and the contained
|
jtulach@146
|
465 |
* input stream does not support reading after close, or
|
jtulach@146
|
466 |
* another I/O error occurs.
|
jtulach@146
|
467 |
* @see java.io.DataInputStream#readLong()
|
jtulach@146
|
468 |
* @see java.lang.Double#longBitsToDouble(long)
|
jtulach@146
|
469 |
*/
|
jtulach@146
|
470 |
public final double readDouble() throws IOException {
|
jaroslav@185
|
471 |
int hi = readInt();
|
jaroslav@185
|
472 |
int low = readInt();
|
jaroslav@185
|
473 |
return toDouble(hi, low);
|
jaroslav@185
|
474 |
}
|
jaroslav@185
|
475 |
|
jaroslav@185
|
476 |
@JavaScriptBody(args={ "hi", "low" },
|
jaroslav@185
|
477 |
body=
|
jaroslav@185
|
478 |
"if (low == 0) {\n"
|
jaroslav@185
|
479 |
+ " if (hi === 0x7ff00000) return Number.POSITIVE_INFINITY;\n"
|
jaroslav@185
|
480 |
+ " if (hi === 0xfff00000) return Number.NEGATIVE_INFINITY;\n"
|
jaroslav@185
|
481 |
+ "}\n"
|
jaroslav@185
|
482 |
+ "if (hi >= 0x7ff00000 && hi <= 0x7fffffff) return Number.NaN;\n"
|
jaroslav@185
|
483 |
+ "if (hi >= 0xfff00000 && hi <= 0xffffffff) return Number.NaN;\n"
|
jaroslav@185
|
484 |
+ "var s = (hi & 0x80000000) === 0 ? 1 : -1;\n"
|
jaroslav@185
|
485 |
+ "var e = (hi >> 20) & 0x7ff;\n"
|
jaroslav@185
|
486 |
+ "var to32 = low >> 0;\n"
|
jaroslav@185
|
487 |
+ "if (e === 0) {\n"
|
jaroslav@185
|
488 |
+ " if (to32 & 0x80000000) {\n"
|
jaroslav@185
|
489 |
+ " hi = hi << 1 + 1; low = low << 1;\n"
|
jaroslav@185
|
490 |
+ " } else {\n"
|
jaroslav@185
|
491 |
+ " hi = hi << 1; low = low << 1;\n"
|
jaroslav@185
|
492 |
+ " }\n"
|
jaroslav@185
|
493 |
+ "} else {\n"
|
jaroslav@185
|
494 |
+ " hi = (hi & 0xfffff) | 0x100000;\n"
|
jaroslav@185
|
495 |
+ "}\n"
|
jaroslav@185
|
496 |
+ "to32 = low >> 0;\n"
|
jaroslav@185
|
497 |
+ "var m = Math.pow(2.0, 32) * hi + to32;\n"
|
jaroslav@185
|
498 |
+ "var r = s * m * Math.pow(2.0, e - 1075);\n"
|
jaroslav@185
|
499 |
+ "//throw 'exp: ' + e + ' sign: ' + s + ' hi:' + hi + ' low: ' + low + ' m: ' + m + ' r: ' + r;\n"
|
jaroslav@185
|
500 |
+ "return r;\n"
|
jaroslav@185
|
501 |
)
|
jaroslav@185
|
502 |
private static double toDouble(int hi, int low) {
|
jaroslav@185
|
503 |
long both = hi;
|
jaroslav@185
|
504 |
both = (both << 32) & low;
|
jaroslav@185
|
505 |
return Double.doubleToLongBits(both);
|
jtulach@146
|
506 |
}
|
jtulach@146
|
507 |
|
jtulach@146
|
508 |
private char lineBuffer[];
|
jtulach@146
|
509 |
|
jtulach@146
|
510 |
/**
|
jtulach@146
|
511 |
* See the general contract of the <code>readLine</code>
|
jtulach@146
|
512 |
* method of <code>DataInput</code>.
|
jtulach@146
|
513 |
* <p>
|
jtulach@146
|
514 |
* Bytes
|
jtulach@146
|
515 |
* for this operation are read from the contained
|
jtulach@146
|
516 |
* input stream.
|
jtulach@146
|
517 |
*
|
jtulach@146
|
518 |
* @deprecated This method does not properly convert bytes to characters.
|
jtulach@146
|
519 |
* As of JDK 1.1, the preferred way to read lines of text is via the
|
jtulach@146
|
520 |
* <code>BufferedReader.readLine()</code> method. Programs that use the
|
jtulach@146
|
521 |
* <code>DataInputStream</code> class to read lines can be converted to use
|
jtulach@146
|
522 |
* the <code>BufferedReader</code> class by replacing code of the form:
|
jtulach@146
|
523 |
* <blockquote><pre>
|
jtulach@146
|
524 |
* DataInputStream d = new DataInputStream(in);
|
jtulach@146
|
525 |
* </pre></blockquote>
|
jtulach@146
|
526 |
* with:
|
jtulach@146
|
527 |
* <blockquote><pre>
|
jtulach@146
|
528 |
* BufferedReader d
|
jtulach@146
|
529 |
* = new BufferedReader(new InputStreamReader(in));
|
jtulach@146
|
530 |
* </pre></blockquote>
|
jtulach@146
|
531 |
*
|
jtulach@146
|
532 |
* @return the next line of text from this input stream.
|
jtulach@146
|
533 |
* @exception IOException if an I/O error occurs.
|
jtulach@146
|
534 |
* @see java.io.BufferedReader#readLine()
|
jtulach@146
|
535 |
* @see java.io.FilterInputStream#in
|
jtulach@146
|
536 |
*/
|
jtulach@146
|
537 |
@Deprecated
|
jtulach@146
|
538 |
public final String readLine() throws IOException {
|
jtulach@146
|
539 |
char buf[] = lineBuffer;
|
jtulach@146
|
540 |
|
jtulach@146
|
541 |
if (buf == null) {
|
jtulach@146
|
542 |
buf = lineBuffer = new char[128];
|
jtulach@146
|
543 |
}
|
jtulach@146
|
544 |
|
jtulach@146
|
545 |
int room = buf.length;
|
jtulach@146
|
546 |
int offset = 0;
|
jtulach@146
|
547 |
int c;
|
jtulach@146
|
548 |
|
jtulach@146
|
549 |
loop: while (true) {
|
jtulach@146
|
550 |
switch (c = in.read()) {
|
jtulach@146
|
551 |
case -1:
|
jtulach@146
|
552 |
case '\n':
|
jtulach@146
|
553 |
break loop;
|
jtulach@146
|
554 |
|
jtulach@146
|
555 |
case '\r':
|
jtulach@146
|
556 |
int c2 = in.read();
|
jtulach@146
|
557 |
if ((c2 != '\n') && (c2 != -1)) {
|
jtulach@146
|
558 |
if (!(in instanceof PushbackInputStream)) {
|
jtulach@146
|
559 |
this.in = new PushbackInputStream(in);
|
jtulach@146
|
560 |
}
|
jtulach@146
|
561 |
((PushbackInputStream)in).unread(c2);
|
jtulach@146
|
562 |
}
|
jtulach@146
|
563 |
break loop;
|
jtulach@146
|
564 |
|
jtulach@146
|
565 |
default:
|
jtulach@146
|
566 |
if (--room < 0) {
|
jtulach@146
|
567 |
buf = new char[offset + 128];
|
jtulach@146
|
568 |
room = buf.length - offset - 1;
|
jaroslav@560
|
569 |
System.arraycopy(lineBuffer, 0, buf, 0, offset);
|
jtulach@146
|
570 |
lineBuffer = buf;
|
jtulach@146
|
571 |
}
|
jtulach@146
|
572 |
buf[offset++] = (char) c;
|
jtulach@146
|
573 |
break;
|
jtulach@146
|
574 |
}
|
jtulach@146
|
575 |
}
|
jtulach@146
|
576 |
if ((c == -1) && (offset == 0)) {
|
jtulach@146
|
577 |
return null;
|
jtulach@146
|
578 |
}
|
jtulach@146
|
579 |
return String.copyValueOf(buf, 0, offset);
|
jtulach@146
|
580 |
}
|
jtulach@146
|
581 |
|
jtulach@146
|
582 |
/**
|
jtulach@146
|
583 |
* See the general contract of the <code>readUTF</code>
|
jtulach@146
|
584 |
* method of <code>DataInput</code>.
|
jtulach@146
|
585 |
* <p>
|
jtulach@146
|
586 |
* Bytes
|
jtulach@146
|
587 |
* for this operation are read from the contained
|
jtulach@146
|
588 |
* input stream.
|
jtulach@146
|
589 |
*
|
jtulach@146
|
590 |
* @return a Unicode string.
|
jtulach@146
|
591 |
* @exception EOFException if this input stream reaches the end before
|
jtulach@146
|
592 |
* reading all the bytes.
|
jtulach@146
|
593 |
* @exception IOException the stream has been closed and the contained
|
jtulach@146
|
594 |
* input stream does not support reading after close, or
|
jtulach@146
|
595 |
* another I/O error occurs.
|
jtulach@146
|
596 |
* @exception UTFDataFormatException if the bytes do not represent a valid
|
jtulach@146
|
597 |
* modified UTF-8 encoding of a string.
|
jtulach@146
|
598 |
* @see java.io.DataInputStream#readUTF(java.io.DataInput)
|
jtulach@146
|
599 |
*/
|
jtulach@146
|
600 |
public final String readUTF() throws IOException {
|
jtulach@146
|
601 |
return readUTF(this);
|
jtulach@146
|
602 |
}
|
jtulach@146
|
603 |
|
jtulach@146
|
604 |
/**
|
jtulach@146
|
605 |
* Reads from the
|
jtulach@146
|
606 |
* stream <code>in</code> a representation
|
jtulach@146
|
607 |
* of a Unicode character string encoded in
|
jtulach@146
|
608 |
* <a href="DataInput.html#modified-utf-8">modified UTF-8</a> format;
|
jtulach@146
|
609 |
* this string of characters is then returned as a <code>String</code>.
|
jtulach@146
|
610 |
* The details of the modified UTF-8 representation
|
jtulach@146
|
611 |
* are exactly the same as for the <code>readUTF</code>
|
jtulach@146
|
612 |
* method of <code>DataInput</code>.
|
jtulach@146
|
613 |
*
|
jtulach@146
|
614 |
* @param in a data input stream.
|
jtulach@146
|
615 |
* @return a Unicode string.
|
jtulach@146
|
616 |
* @exception EOFException if the input stream reaches the end
|
jtulach@146
|
617 |
* before all the bytes.
|
jtulach@146
|
618 |
* @exception IOException the stream has been closed and the contained
|
jtulach@146
|
619 |
* input stream does not support reading after close, or
|
jtulach@146
|
620 |
* another I/O error occurs.
|
jtulach@146
|
621 |
* @exception UTFDataFormatException if the bytes do not represent a
|
jtulach@146
|
622 |
* valid modified UTF-8 encoding of a Unicode string.
|
jtulach@146
|
623 |
* @see java.io.DataInputStream#readUnsignedShort()
|
jtulach@146
|
624 |
*/
|
jtulach@146
|
625 |
public final static String readUTF(DataInput in) throws IOException {
|
jtulach@146
|
626 |
int utflen = in.readUnsignedShort();
|
jtulach@146
|
627 |
byte[] bytearr = null;
|
jtulach@146
|
628 |
char[] chararr = null;
|
jtulach@146
|
629 |
if (in instanceof DataInputStream) {
|
jtulach@146
|
630 |
DataInputStream dis = (DataInputStream)in;
|
jtulach@146
|
631 |
if (dis.bytearr.length < utflen){
|
jtulach@146
|
632 |
dis.bytearr = new byte[utflen*2];
|
jtulach@146
|
633 |
dis.chararr = new char[utflen*2];
|
jtulach@146
|
634 |
}
|
jtulach@146
|
635 |
chararr = dis.chararr;
|
jtulach@146
|
636 |
bytearr = dis.bytearr;
|
jtulach@146
|
637 |
} else {
|
jtulach@146
|
638 |
bytearr = new byte[utflen];
|
jtulach@146
|
639 |
chararr = new char[utflen];
|
jtulach@146
|
640 |
}
|
jtulach@146
|
641 |
|
jtulach@146
|
642 |
int c, char2, char3;
|
jtulach@146
|
643 |
int count = 0;
|
jtulach@146
|
644 |
int chararr_count=0;
|
jtulach@146
|
645 |
|
jtulach@146
|
646 |
in.readFully(bytearr, 0, utflen);
|
jtulach@146
|
647 |
|
jtulach@146
|
648 |
while (count < utflen) {
|
jtulach@146
|
649 |
c = (int) bytearr[count] & 0xff;
|
jtulach@146
|
650 |
if (c > 127) break;
|
jtulach@146
|
651 |
count++;
|
jtulach@146
|
652 |
chararr[chararr_count++]=(char)c;
|
jtulach@146
|
653 |
}
|
jtulach@146
|
654 |
|
jtulach@146
|
655 |
while (count < utflen) {
|
jtulach@146
|
656 |
c = (int) bytearr[count] & 0xff;
|
jtulach@146
|
657 |
switch (c >> 4) {
|
jtulach@146
|
658 |
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
|
jtulach@146
|
659 |
/* 0xxxxxxx*/
|
jtulach@146
|
660 |
count++;
|
jtulach@146
|
661 |
chararr[chararr_count++]=(char)c;
|
jtulach@146
|
662 |
break;
|
jtulach@146
|
663 |
case 12: case 13:
|
jtulach@146
|
664 |
/* 110x xxxx 10xx xxxx*/
|
jtulach@146
|
665 |
count += 2;
|
jtulach@146
|
666 |
if (count > utflen)
|
jtulach@146
|
667 |
throw new UTFDataFormatException(
|
jtulach@146
|
668 |
"malformed input: partial character at end");
|
jtulach@146
|
669 |
char2 = (int) bytearr[count-1];
|
jtulach@146
|
670 |
if ((char2 & 0xC0) != 0x80)
|
jtulach@146
|
671 |
throw new UTFDataFormatException(
|
jtulach@146
|
672 |
"malformed input around byte " + count);
|
jtulach@146
|
673 |
chararr[chararr_count++]=(char)(((c & 0x1F) << 6) |
|
jtulach@146
|
674 |
(char2 & 0x3F));
|
jtulach@146
|
675 |
break;
|
jtulach@146
|
676 |
case 14:
|
jtulach@146
|
677 |
/* 1110 xxxx 10xx xxxx 10xx xxxx */
|
jtulach@146
|
678 |
count += 3;
|
jtulach@146
|
679 |
if (count > utflen)
|
jtulach@146
|
680 |
throw new UTFDataFormatException(
|
jtulach@146
|
681 |
"malformed input: partial character at end");
|
jtulach@146
|
682 |
char2 = (int) bytearr[count-2];
|
jtulach@146
|
683 |
char3 = (int) bytearr[count-1];
|
jtulach@146
|
684 |
if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80))
|
jtulach@146
|
685 |
throw new UTFDataFormatException(
|
jtulach@146
|
686 |
"malformed input around byte " + (count-1));
|
jtulach@146
|
687 |
chararr[chararr_count++]=(char)(((c & 0x0F) << 12) |
|
jtulach@146
|
688 |
((char2 & 0x3F) << 6) |
|
jtulach@146
|
689 |
((char3 & 0x3F) << 0));
|
jtulach@146
|
690 |
break;
|
jtulach@146
|
691 |
default:
|
jtulach@146
|
692 |
/* 10xx xxxx, 1111 xxxx */
|
jtulach@146
|
693 |
throw new UTFDataFormatException(
|
jtulach@146
|
694 |
"malformed input around byte " + count);
|
jtulach@146
|
695 |
}
|
jtulach@146
|
696 |
}
|
jtulach@146
|
697 |
// The number of chars produced may be less than utflen
|
jtulach@146
|
698 |
return new String(chararr, 0, chararr_count);
|
jtulach@146
|
699 |
}
|
jtulach@146
|
700 |
}
|