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8187443: Forest Consolidation: Move files to unified layout
Reviewed-by: darcy, ihse
This commit is contained in:
Erik Joelsson
parent
270fe13182
commit
3789983e89
56923 changed files with 3 additions and 15727 deletions
668
src/java.base/share/classes/java/io/DataInputStream.java
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668
src/java.base/share/classes/java/io/DataInputStream.java
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@ -0,0 +1,668 @@
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/*
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* Copyright (c) 1994, 2016, 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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/**
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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 1.0
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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}
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* method of {@code DataInput}.
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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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* @throws NullPointerException if {@code b} is {@code null}.
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* @throws EOFException if this input stream reaches the end before
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* reading all the bytes.
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* @throws 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}
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* method of {@code DataInput}.
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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 in the data array {@code b}.
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* @param len the number of bytes to read.
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* @exception NullPointerException if {@code b} is {@code null}.
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* @exception IndexOutOfBoundsException if {@code off} is negative,
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* {@code len} is negative, or {@code len} is greater than
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* {@code b.length - off}.
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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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* @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 int readUnsignedByte() 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;
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}
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/**
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* See the general contract of the <code>readShort</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 two bytes of this input stream, interpreted as a
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* signed 16-bit number.
|
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* @exception EOFException if this input stream reaches the end before
|
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* reading two 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 short readShort() throws IOException {
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int ch1 = in.read();
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int ch2 = in.read();
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if ((ch1 | ch2) < 0)
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throw new EOFException();
|
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return (short)((ch1 << 8) + (ch2 << 0));
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}
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/**
|
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* See the general contract of the <code>readUnsignedShort</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 two bytes of this input stream, interpreted as an
|
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* unsigned 16-bit integer.
|
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* @exception EOFException if this input stream reaches the end before
|
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* reading two 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 int readUnsignedShort() throws IOException {
|
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int ch1 = in.read();
|
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int ch2 = in.read();
|
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if ((ch1 | ch2) < 0)
|
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throw new EOFException();
|
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return (ch1 << 8) + (ch2 << 0);
|
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}
|
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|
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/**
|
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* See the general contract of the <code>readChar</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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*
|
||||
* @return the next two bytes of this input stream, interpreted as a
|
||||
* <code>char</code>.
|
||||
* @exception EOFException if this input stream reaches the end before
|
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* reading two bytes.
|
||||
* @exception IOException the stream has been closed and the contained
|
||||
* input stream does not support reading after close, or
|
||||
* another I/O error occurs.
|
||||
* @see java.io.FilterInputStream#in
|
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*/
|
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public final char readChar() throws IOException {
|
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int ch1 = in.read();
|
||||
int ch2 = in.read();
|
||||
if ((ch1 | ch2) < 0)
|
||||
throw new EOFException();
|
||||
return (char)((ch1 << 8) + (ch2 << 0));
|
||||
}
|
||||
|
||||
/**
|
||||
* See the general contract of the <code>readInt</code>
|
||||
* method of <code>DataInput</code>.
|
||||
* <p>
|
||||
* Bytes
|
||||
* for this operation are read from the contained
|
||||
* input stream.
|
||||
*
|
||||
* @return the next four bytes of this input stream, interpreted as an
|
||||
* <code>int</code>.
|
||||
* @exception EOFException if this input stream reaches the end before
|
||||
* reading four bytes.
|
||||
* @exception IOException the stream has been closed and the contained
|
||||
* input stream does not support reading after close, or
|
||||
* another I/O error occurs.
|
||||
* @see java.io.FilterInputStream#in
|
||||
*/
|
||||
public final int readInt() throws IOException {
|
||||
int ch1 = in.read();
|
||||
int ch2 = in.read();
|
||||
int ch3 = in.read();
|
||||
int ch4 = in.read();
|
||||
if ((ch1 | ch2 | ch3 | ch4) < 0)
|
||||
throw new EOFException();
|
||||
return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0));
|
||||
}
|
||||
|
||||
private byte readBuffer[] = new byte[8];
|
||||
|
||||
/**
|
||||
* See the general contract of the <code>readLong</code>
|
||||
* method of <code>DataInput</code>.
|
||||
* <p>
|
||||
* Bytes
|
||||
* for this operation are read from the contained
|
||||
* input stream.
|
||||
*
|
||||
* @return the next eight bytes of this input stream, interpreted as a
|
||||
* <code>long</code>.
|
||||
* @exception EOFException if this input stream reaches the end before
|
||||
* reading eight bytes.
|
||||
* @exception IOException the stream has been closed and the contained
|
||||
* input stream does not support reading after close, or
|
||||
* another I/O error occurs.
|
||||
* @see java.io.FilterInputStream#in
|
||||
*/
|
||||
public final long readLong() throws IOException {
|
||||
readFully(readBuffer, 0, 8);
|
||||
return (((long)readBuffer[0] << 56) +
|
||||
((long)(readBuffer[1] & 255) << 48) +
|
||||
((long)(readBuffer[2] & 255) << 40) +
|
||||
((long)(readBuffer[3] & 255) << 32) +
|
||||
((long)(readBuffer[4] & 255) << 24) +
|
||||
((readBuffer[5] & 255) << 16) +
|
||||
((readBuffer[6] & 255) << 8) +
|
||||
((readBuffer[7] & 255) << 0));
|
||||
}
|
||||
|
||||
/**
|
||||
* See the general contract of the <code>readFloat</code>
|
||||
* method of <code>DataInput</code>.
|
||||
* <p>
|
||||
* Bytes
|
||||
* for this operation are read from the contained
|
||||
* input stream.
|
||||
*
|
||||
* @return the next four bytes of this input stream, interpreted as a
|
||||
* <code>float</code>.
|
||||
* @exception EOFException if this input stream reaches the end before
|
||||
* reading four bytes.
|
||||
* @exception IOException the stream has been closed and the contained
|
||||
* input stream does not support reading after close, or
|
||||
* another I/O error occurs.
|
||||
* @see java.io.DataInputStream#readInt()
|
||||
* @see java.lang.Float#intBitsToFloat(int)
|
||||
*/
|
||||
public final float readFloat() throws IOException {
|
||||
return Float.intBitsToFloat(readInt());
|
||||
}
|
||||
|
||||
/**
|
||||
* See the general contract of the <code>readDouble</code>
|
||||
* method of <code>DataInput</code>.
|
||||
* <p>
|
||||
* Bytes
|
||||
* for this operation are read from the contained
|
||||
* input stream.
|
||||
*
|
||||
* @return the next eight bytes of this input stream, interpreted as a
|
||||
* <code>double</code>.
|
||||
* @exception EOFException if this input stream reaches the end before
|
||||
* reading eight bytes.
|
||||
* @exception IOException the stream has been closed and the contained
|
||||
* input stream does not support reading after close, or
|
||||
* another I/O error occurs.
|
||||
* @see java.io.DataInputStream#readLong()
|
||||
* @see java.lang.Double#longBitsToDouble(long)
|
||||
*/
|
||||
public final double readDouble() throws IOException {
|
||||
return Double.longBitsToDouble(readLong());
|
||||
}
|
||||
|
||||
private char lineBuffer[];
|
||||
|
||||
/**
|
||||
* See the general contract of the <code>readLine</code>
|
||||
* method of <code>DataInput</code>.
|
||||
* <p>
|
||||
* Bytes
|
||||
* for this operation are read from the contained
|
||||
* input stream.
|
||||
*
|
||||
* @deprecated This method does not properly convert bytes to characters.
|
||||
* As of JDK 1.1, the preferred way to read lines of text is via the
|
||||
* <code>BufferedReader.readLine()</code> method. Programs that use the
|
||||
* <code>DataInputStream</code> class to read lines can be converted to use
|
||||
* the <code>BufferedReader</code> class by replacing code of the form:
|
||||
* <blockquote><pre>
|
||||
* DataInputStream d = new DataInputStream(in);
|
||||
* </pre></blockquote>
|
||||
* with:
|
||||
* <blockquote><pre>
|
||||
* BufferedReader d
|
||||
* = new BufferedReader(new InputStreamReader(in));
|
||||
* </pre></blockquote>
|
||||
*
|
||||
* @return the next line of text from this input stream.
|
||||
* @exception IOException if an I/O error occurs.
|
||||
* @see java.io.BufferedReader#readLine()
|
||||
* @see java.io.FilterInputStream#in
|
||||
*/
|
||||
@Deprecated
|
||||
public final String readLine() throws IOException {
|
||||
char buf[] = lineBuffer;
|
||||
|
||||
if (buf == null) {
|
||||
buf = lineBuffer = new char[128];
|
||||
}
|
||||
|
||||
int room = buf.length;
|
||||
int offset = 0;
|
||||
int c;
|
||||
|
||||
loop: while (true) {
|
||||
switch (c = in.read()) {
|
||||
case -1:
|
||||
case '\n':
|
||||
break loop;
|
||||
|
||||
case '\r':
|
||||
int c2 = in.read();
|
||||
if ((c2 != '\n') && (c2 != -1)) {
|
||||
if (!(in instanceof PushbackInputStream)) {
|
||||
this.in = new PushbackInputStream(in);
|
||||
}
|
||||
((PushbackInputStream)in).unread(c2);
|
||||
}
|
||||
break loop;
|
||||
|
||||
default:
|
||||
if (--room < 0) {
|
||||
buf = new char[offset + 128];
|
||||
room = buf.length - offset - 1;
|
||||
System.arraycopy(lineBuffer, 0, buf, 0, offset);
|
||||
lineBuffer = buf;
|
||||
}
|
||||
buf[offset++] = (char) c;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if ((c == -1) && (offset == 0)) {
|
||||
return null;
|
||||
}
|
||||
return String.copyValueOf(buf, 0, offset);
|
||||
}
|
||||
|
||||
/**
|
||||
* See the general contract of the <code>readUTF</code>
|
||||
* method of <code>DataInput</code>.
|
||||
* <p>
|
||||
* Bytes
|
||||
* for this operation are read from the contained
|
||||
* input stream.
|
||||
*
|
||||
* @return a Unicode string.
|
||||
* @exception EOFException if this input stream reaches the end before
|
||||
* reading all the bytes.
|
||||
* @exception IOException the stream has been closed and the contained
|
||||
* input stream does not support reading after close, or
|
||||
* another I/O error occurs.
|
||||
* @exception UTFDataFormatException if the bytes do not represent a valid
|
||||
* modified UTF-8 encoding of a string.
|
||||
* @see java.io.DataInputStream#readUTF(java.io.DataInput)
|
||||
*/
|
||||
public final String readUTF() throws IOException {
|
||||
return readUTF(this);
|
||||
}
|
||||
|
||||
/**
|
||||
* Reads from the
|
||||
* stream <code>in</code> a representation
|
||||
* of a Unicode character string encoded in
|
||||
* <a href="DataInput.html#modified-utf-8">modified UTF-8</a> format;
|
||||
* this string of characters is then returned as a <code>String</code>.
|
||||
* The details of the modified UTF-8 representation
|
||||
* are exactly the same as for the <code>readUTF</code>
|
||||
* method of <code>DataInput</code>.
|
||||
*
|
||||
* @param in a data input stream.
|
||||
* @return a Unicode string.
|
||||
* @exception EOFException if the input stream reaches the end
|
||||
* before all the bytes.
|
||||
* @exception IOException the stream has been closed and the contained
|
||||
* input stream does not support reading after close, or
|
||||
* another I/O error occurs.
|
||||
* @exception UTFDataFormatException if the bytes do not represent a
|
||||
* valid modified UTF-8 encoding of a Unicode string.
|
||||
* @see java.io.DataInputStream#readUnsignedShort()
|
||||
*/
|
||||
public static final String readUTF(DataInput in) throws IOException {
|
||||
int utflen = in.readUnsignedShort();
|
||||
byte[] bytearr = null;
|
||||
char[] chararr = null;
|
||||
if (in instanceof DataInputStream) {
|
||||
DataInputStream dis = (DataInputStream)in;
|
||||
if (dis.bytearr.length < utflen){
|
||||
dis.bytearr = new byte[utflen*2];
|
||||
dis.chararr = new char[utflen*2];
|
||||
}
|
||||
chararr = dis.chararr;
|
||||
bytearr = dis.bytearr;
|
||||
} else {
|
||||
bytearr = new byte[utflen];
|
||||
chararr = new char[utflen];
|
||||
}
|
||||
|
||||
int c, char2, char3;
|
||||
int count = 0;
|
||||
int chararr_count=0;
|
||||
|
||||
in.readFully(bytearr, 0, utflen);
|
||||
|
||||
while (count < utflen) {
|
||||
c = (int) bytearr[count] & 0xff;
|
||||
if (c > 127) break;
|
||||
count++;
|
||||
chararr[chararr_count++]=(char)c;
|
||||
}
|
||||
|
||||
while (count < utflen) {
|
||||
c = (int) bytearr[count] & 0xff;
|
||||
switch (c >> 4) {
|
||||
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
|
||||
/* 0xxxxxxx*/
|
||||
count++;
|
||||
chararr[chararr_count++]=(char)c;
|
||||
break;
|
||||
case 12: case 13:
|
||||
/* 110x xxxx 10xx xxxx*/
|
||||
count += 2;
|
||||
if (count > utflen)
|
||||
throw new UTFDataFormatException(
|
||||
"malformed input: partial character at end");
|
||||
char2 = (int) bytearr[count-1];
|
||||
if ((char2 & 0xC0) != 0x80)
|
||||
throw new UTFDataFormatException(
|
||||
"malformed input around byte " + count);
|
||||
chararr[chararr_count++]=(char)(((c & 0x1F) << 6) |
|
||||
(char2 & 0x3F));
|
||||
break;
|
||||
case 14:
|
||||
/* 1110 xxxx 10xx xxxx 10xx xxxx */
|
||||
count += 3;
|
||||
if (count > utflen)
|
||||
throw new UTFDataFormatException(
|
||||
"malformed input: partial character at end");
|
||||
char2 = (int) bytearr[count-2];
|
||||
char3 = (int) bytearr[count-1];
|
||||
if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80))
|
||||
throw new UTFDataFormatException(
|
||||
"malformed input around byte " + (count-1));
|
||||
chararr[chararr_count++]=(char)(((c & 0x0F) << 12) |
|
||||
((char2 & 0x3F) << 6) |
|
||||
((char3 & 0x3F) << 0));
|
||||
break;
|
||||
default:
|
||||
/* 10xx xxxx, 1111 xxxx */
|
||||
throw new UTFDataFormatException(
|
||||
"malformed input around byte " + count);
|
||||
}
|
||||
}
|
||||
// The number of chars produced may be less than utflen
|
||||
return new String(chararr, 0, chararr_count);
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue