package scjlibs.io;
/*
* %W% %E%
*
* Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
/**
* 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>
* DataInputStream is not necessarily safe for multithreaded access. Thread
* safety is optional and is the responsibility of users of methods in this
* class.
*
* @author Arthur van Hoff
* @version %I%, %G%
* @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);
}
/**
* working arrays initialized on demand by readUTF
*/
private byte bytearr[] = new byte[80];
private char chararr[] = new char[80];
/**
* 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>
* 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 the first byte cannot be read for any reason other than
* end of file, the stream has been closed and the underlying
* input stream does not support reading after close, or
* another 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>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.
*
* @param b
* the buffer into which the data is read.
* @param off
* the start offset in the destination array <code>b</code>
* @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 NullPointerException
* If <code>b</code> is <code>null</code>.
* @exception IndexOutOfBoundsException
* If <code>off</code> is negative, <code>len</code> is
* negative, or <code>len</code> is greater than
* <code>b.length - off</code>
* @exception IOException
* if the first byte cannot be read for any reason other than
* end of file, the stream has been closed and the underlying
* input stream does not support reading after close, or
* another 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
* 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 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
* 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 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 the contained input stream does not support seek, or
* the stream has been closed and the contained input stream
* does not support reading after close, or another 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
* 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 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
* 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 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
* 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 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
* 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 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
* 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 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, interpreted as a
* <code>char</code>.
* @exception EOFException
* if this input stream reaches the end before 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
*/
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
* 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 final static 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);
}
}