/*
* @(#)DataInputStream.java 1.59 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package java.io;
/**
* A data input stream lets an application read primitive Java data
* types from an underlying input stream in a machine-independent
* way. An application uses a data output stream to write data that
* can later be read by a data input stream.
* <p>
* Data input streams and data output streams represent Unicode
* strings in a format that is a slight modification of UTF-8. (For
* more information, see X/Open Company Ltd., "File System Safe
* UCS Transformation Format (FSS_UTF)", X/Open Preliminary
* Specification, Document Number: P316. This information also
* appears in ISO/IEC 10646, Annex P.) Note that in the
* following tables, the most significant bit appears in the
* far left-hand column.
* <p>
* All characters in the range <code>'\u0001'</code> to
* <code>'\u007F'</code> are represented by a single byte:
*
* <center>
* <table border="3" summary="Bit values and bytes">
* <tr>
* <td></td>
* <th id="bit" colspan=2><P ALIGN="LEFT">Bit Values</P></th>
* </tr>
* <tr>
* <th id="byte1">Byte 1 </th>
* <td headers="bit byte1"><i>0</i></td>
* <td>bits 6-0</td>
* </tr>
* </table>
* </center>
*
* <p>
* The null character <code>'\u0000'</code> and characters in the
* range <code>'\u0080'</code> to <code>'\u07FF'</code> are
* represented by a pair of bytes:
*
* <center>
* <table border="3" summary="Bit values and bytes">
* <tr>
* <td></td>
* <th id="bit" colspan=4><P ALIGN="LEFT">Bit Values</P></th>
* </tr>
* <tr>
* <th id="byte1">Byte 1 </th>
* <td headers="bit byte1">1</td>
* <td headers="bit byte1">1</td>
* <td headers="bit byte1">0</td>
* <td headers="bit byte1">bits 10-6</td>
* </tr>
* <tr>
* <th id="byte2">Byte 2 </th>
* <td headers="bit byte2">1</td>
* <td headers="bit byte2">0</td>
* <td headers="bit byte2" colspan=2>bits 5-0</td>
* </tr>
* </table>
* </center>
*
* <br>
* Characters in the range <code>'\u0800'</code> to
* <code>'\uFFFF'</code> are represented by three bytes:
*
* <center>
* <table border="3" summary="Bit values and bytes">
* <tr>
* <td></td>
* <th id="bit" colspan=5><P ALIGN="LEFT">Bit Values</P></th>
* </tr>
*
* <tr>
* <th id="byte1">Byte 1 </th>
* <td headers="bit byte1">1</td>
* <td headers="bit byte1">1</td>
* <td headers="bit byte1">1</td>
* <td headers="bit byte1">0</td>
* <td headers="bit byte1">bits 15-12</td>
* </tr>
* <tr>
* <th id="byte2">Byte 2 </th>
* <td headers="bit byte2">1</td>
* <td headers="bit byte2">0</td>
* <td headers="bit byte2" colspan=3>bits 11-6</td>
* </tr>
* <tr>
* <th id="byte3">Byte 3 </th>
* <td headers="bit byte3">1</td>
* <td headers="bit byte3">0</td>
* <td headers="bit byte3" colspan=3>bits 5-0</td>
* </tr>
* </table>
* </center>
* <p>
* The two differences between this format and the
* "standard" UTF-8 format are the following:
* <ul>
* <li>The null byte <code>'\u0000'</code> is encoded in 2-byte format
* rather than 1-byte, so that the encoded strings never have
* embedded nulls.
* <li>Only the 1-byte, 2-byte, and 3-byte formats are used.
* </ul>
*
* @version 1.52 10/17/00
* @see java.io.DataOutputStream
* @since JDK1.0
*/
public
class DataInputStream extends FilterInputStream implements DataInput {
/**
* Creates a DataInputStream that uses the specified
* underlying InputStream.
*
* @param in the specified input stream
*/
public DataInputStream(InputStream in) {
super(in);
}
/**
* Reads some number of bytes from the contained input stream and
* stores them into the buffer array <code>b</code>. The number of
* bytes actually read is returned as an integer. This method blocks
* until input data is available, end of file is detected, or an
* exception is thrown.
*
* <p>If <code>b</code> is null, a <code>NullPointerException</code> is
* thrown. If the length of <code>b</code> is zero, then no bytes are
* read and <code>0</code> is returned; otherwise, there is an attempt
* to read at least one byte. If no byte is available because the
* stream is at end of file, the value <code>-1</code> is returned;
* otherwise, at least one byte is read and stored into <code>b</code>.
*
* <p>The first byte read is stored into element <code>b[0]</code>, the
* next one into <code>b[1]</code>, and so on. The number of bytes read
* is, at most, equal to the length of <code>b</code>. Let <code>k</code>
* be the number of bytes actually read; these bytes will be stored in
* elements <code>b[0]</code> through <code>b[k-1]</code>, leaving
* elements <code>b[k]</code> through <code>b[b.length-1]</code>
* unaffected.
*
* <p>If the first byte cannot be read for any reason other than end of
* file, then an <code>IOException</code> is thrown. In particular, an
* <code>IOException</code> is thrown if the input stream has been closed.
*
* <p>The <code>read(b)</code> method has the same effect as:
* <blockquote><pre>
* read(b, 0, b.length)
* </pre></blockquote>
*
* @param b the buffer into which the data is read.
* @return the total number of bytes read into the buffer, or
* <code>-1</code> if there is no more data because the end
* of the stream has been reached.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
* @see java.io.InputStream#read(byte[], int, int)
*/
public final int read(byte b[]) throws IOException {
return in.read(b, 0, b.length);
}
/**
* Reads up to <code>len</code> bytes of data from the contained
* input stream into an array of bytes. An attempt is made to read
* as many as <code>len</code> bytes, but a smaller number may be read,
* possibly zero. The number of bytes actually read is returned as an
* integer.
*
* <p> This method blocks until input data is available, end of file is
* detected, or an exception is thrown.
*
* <p> If <code>b</code> is <code>null</code>, a
* <code>NullPointerException</code> is thrown.
*
* <p> If <code>off</code> is negative, or <code>len</code> is negative, or
* <code>off+len</code> is greater than the length of the array
* <code>b</code>, then an <code>IndexOutOfBoundsException</code> is
* thrown.
*
* <p> If <code>len</code> is zero, then no bytes are read and
* <code>0</code> is returned; otherwise, there is an attempt to read at
* least one byte. If no byte is available because the stream is at end of
* file, the value <code>-1</code> is returned; otherwise, at least one
* byte is read and stored into <code>b</code>.
*
* <p> The first byte read is stored into element <code>b[off]</code>, the
* next one into <code>b[off+1]</code>, and so on. The number of bytes read
* is, at most, equal to <code>len</code>. Let <i>k</i> be the number of
* bytes actually read; these bytes will be stored in elements
* <code>b[off]</code> through <code>b[off+</code><i>k</i><code>-1]</code>,
* leaving elements <code>b[off+</code><i>k</i><code>]</code> through
* <code>b[off+len-1]</code> unaffected.
*
* <p> In every case, elements <code>b[0]</code> through
* <code>b[off]</code> and elements <code>b[off+len]</code> through
* <code>b[b.length-1]</code> are unaffected.
*
* <p> If the first byte cannot be read for any reason other than end of
* file, then an <code>IOException</code> is thrown. In particular, an
* <code>IOException</code> is thrown if the input stream has been closed.
*
* @param b the buffer into which the data is read.
* @param off the start offset of the data.
* @param len the maximum number of bytes read.
* @return the total number of bytes read into the buffer, or
* <code>-1</code> if there is no more data because the end
* of the stream has been reached.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
* @see java.io.InputStream#read(byte[], int, int)
*/
public final int read(byte b[], int off, int len) throws IOException {
return in.read(b, off, len);
}
/**
* See the general contract of the <code>readFully</code>
* method of <code>DataInput</code>.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @param b the buffer into which the data is read.
* @exception EOFException if this input stream reaches the end before
* reading all the bytes.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
*/
public final void readFully(byte b[]) throws IOException {
readFully(b, 0, b.length);
}
/**
* See the general contract of the <code>readFully</code>
* method of <code>DataInput</code>.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @param b the buffer into which the data is read.
* @param off the start offset of the data.
* @param len the number of bytes to read.
* @exception EOFException if this input stream reaches the end before
* reading all the bytes.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
*/
public final void readFully(byte b[], int off, int len) throws IOException {
if (len < 0)
throw new IndexOutOfBoundsException();
int n = 0;
while (n < len) {
int count = in.read(b, off + n, len - n);
if (count < 0)
throw new EOFException();
n += count;
}
}
/**
* See the general contract of the <code>skipBytes</code>
* method of <code>DataInput</code>.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @param n the number of bytes to be skipped.
* @return the actual number of bytes skipped.
* @exception IOException if an I/O error occurs.
*/
public final int skipBytes(int n) throws IOException {
int total = 0;
int cur = 0;
while ((total<n) && ((cur = (int) in.skip(n-total)) > 0)) {
total += cur;
}
return total;
}
/**
* See the general contract of the <code>readBoolean</code>
* method of <code>DataInput</code>.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the <code>boolean</code> value read.
* @exception EOFException if this input stream has reached the end.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
*/
public final boolean readBoolean() throws IOException {
int ch = in.read();
if (ch < 0)
throw new EOFException();
return (ch != 0);
}
/**
* See the general contract of the <code>readByte</code>
* method of <code>DataInput</code>.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next byte of this input stream as a signed 8-bit
* <code>byte</code>.
* @exception EOFException if this input stream has reached the end.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
*/
public final byte readByte() throws IOException {
int ch = in.read();
if (ch < 0)
throw new EOFException();
return (byte)(ch);
}
/**
* See the general contract of the <code>readUnsignedByte</code>
* method of <code>DataInput</code>.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next byte of this input stream, interpreted as an
* unsigned 8-bit number.
* @exception EOFException if this input stream has reached the end.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
*/
public final int readUnsignedByte() throws IOException {
int ch = in.read();
if (ch < 0)
throw new EOFException();
return ch;
}
/**
* See the general contract of the <code>readShort</code>
* method of <code>DataInput</code>.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next two bytes of this input stream, interpreted as a
* signed 16-bit number.
* @exception EOFException if this input stream reaches the end before
* reading two bytes.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
*/
public final short readShort() throws IOException {
int ch1 = in.read();
int ch2 = in.read();
if ((ch1 | ch2) < 0)
throw new EOFException();
return (short)((ch1 << 8) + (ch2 << 0));
}
/**
* See the general contract of the <code>readUnsignedShort</code>
* method of <code>DataInput</code>.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next two bytes of this input stream, interpreted as an
* unsigned 16-bit integer.
* @exception EOFException if this input stream reaches the end before
* reading two bytes.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
*/
public final int readUnsignedShort() throws IOException {
int ch1 = in.read();
int ch2 = in.read();
if ((ch1 | ch2) < 0)
throw new EOFException();
return (ch1 << 8) + (ch2 << 0);
}
/**
* See the general contract of the <code>readChar</code>
* method of <code>DataInput</code>.
* <p>
* Bytes
* for this operation are read from the contained
* input stream.
*
* @return the next two bytes of this input stream as a Unicode
* character.
* @exception EOFException if this input stream reaches the end before
* reading two bytes.
* @exception IOException if an I/O error occurs.
* @see java.io.FilterInputStream#in
*/
public final char readChar() throws IOException {
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 if an 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 if an 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 if an 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 if an 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
*/
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 if an I/O error occurs.
* @exception UTFDataFormatException if the bytes do not represent a valid 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
* Java modified UTF-8 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 if an I/O error occurs.
* @exception UTFDataFormatException if the bytes do not represent a
* valid Java modified UTF-8 encoding of a Unicode string.
* @see java.io.DataInputStream#readUnsignedShort()
*/
public final static String readUTF(DataInput in) throws IOException {
int utflen = in.readUnsignedShort();
StringBuffer str = new StringBuffer(utflen);
byte bytearr [] = new byte[utflen];
int c, char2, char3;
int count = 0;
in.readFully(bytearr, 0, utflen);
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++;
str.append((char)c);
break;
case 12: case 13:
/* 110x xxxx 10xx xxxx*/
count += 2;
if (count > utflen)
throw new UTFDataFormatException();
char2 = (int) bytearr[count-1];
if ((char2 & 0xC0) != 0x80)
throw new UTFDataFormatException();
str.append((char)(((c & 0x1F) << 6) | (char2 & 0x3F)));
break;
case 14:
/* 1110 xxxx 10xx xxxx 10xx xxxx */
count += 3;
if (count > utflen)
throw new UTFDataFormatException();
char2 = (int) bytearr[count-2];
char3 = (int) bytearr[count-1];
if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80))
throw new UTFDataFormatException();
str.append((char)(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0)));
break;
default:
/* 10xx xxxx, 1111 xxxx */
throw new UTFDataFormatException();
}
}
// The number of chars produced may be less than utflen
return new String(str);
}
}