jtulach@146: /* jtulach@146: * Copyright (c) 1994, 2006, Oracle and/or its affiliates. All rights reserved. jtulach@146: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. jtulach@146: * jtulach@146: * This code is free software; you can redistribute it and/or modify it jtulach@146: * under the terms of the GNU General Public License version 2 only, as jtulach@146: * published by the Free Software Foundation. Oracle designates this jtulach@146: * particular file as subject to the "Classpath" exception as provided jtulach@146: * by Oracle in the LICENSE file that accompanied this code. jtulach@146: * jtulach@146: * This code is distributed in the hope that it will be useful, but WITHOUT jtulach@146: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or jtulach@146: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License jtulach@146: * version 2 for more details (a copy is included in the LICENSE file that jtulach@146: * accompanied this code). jtulach@146: * jtulach@146: * You should have received a copy of the GNU General Public License version jtulach@146: * 2 along with this work; if not, write to the Free Software Foundation, jtulach@146: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. jtulach@146: * jtulach@146: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA jtulach@146: * or visit www.oracle.com if you need additional information or have any jtulach@146: * questions. jtulach@146: */ jtulach@146: jtulach@146: package java.io; jtulach@146: jaroslav@185: import org.apidesign.bck2brwsr.core.JavaScriptBody; jaroslav@185: jtulach@146: /** jtulach@146: * A data input stream lets an application read primitive Java data jtulach@146: * types from an underlying input stream in a machine-independent jtulach@146: * way. An application uses a data output stream to write data that jtulach@146: * can later be read by a data input stream. jtulach@146: *
jtulach@146: * DataInputStream is not necessarily safe for multithreaded access.
jtulach@146: * Thread safety is optional and is the responsibility of users of
jtulach@146: * methods in this class.
jtulach@146: *
jtulach@146: * @author Arthur van Hoff
jtulach@146: * @see java.io.DataOutputStream
jtulach@146: * @since JDK1.0
jtulach@146: */
jtulach@146: public
jtulach@146: class DataInputStream extends FilterInputStream implements DataInput {
jtulach@146:
jtulach@146: /**
jtulach@146: * Creates a DataInputStream that uses the specified
jtulach@146: * underlying InputStream.
jtulach@146: *
jtulach@146: * @param in the specified input stream
jtulach@146: */
jtulach@146: public DataInputStream(InputStream in) {
jtulach@146: super(in);
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * working arrays initialized on demand by readUTF
jtulach@146: */
jtulach@146: private byte bytearr[] = new byte[80];
jtulach@146: private char chararr[] = new char[80];
jtulach@146:
jtulach@146: /**
jtulach@146: * Reads some number of bytes from the contained input stream and
jtulach@146: * stores them into the buffer array b
. The number of
jtulach@146: * bytes actually read is returned as an integer. This method blocks
jtulach@146: * until input data is available, end of file is detected, or an
jtulach@146: * exception is thrown.
jtulach@146: *
jtulach@146: *
If b
is null, a NullPointerException
is
jtulach@146: * thrown. If the length of b
is zero, then no bytes are
jtulach@146: * read and 0
is returned; otherwise, there is an attempt
jtulach@146: * to read at least one byte. If no byte is available because the
jtulach@146: * stream is at end of file, the value -1
is returned;
jtulach@146: * otherwise, at least one byte is read and stored into b
.
jtulach@146: *
jtulach@146: *
The first byte read is stored into element b[0]
, the
jtulach@146: * next one into b[1]
, and so on. The number of bytes read
jtulach@146: * is, at most, equal to the length of b
. Let k
jtulach@146: * be the number of bytes actually read; these bytes will be stored in
jtulach@146: * elements b[0]
through b[k-1]
, leaving
jtulach@146: * elements b[k]
through b[b.length-1]
jtulach@146: * unaffected.
jtulach@146: *
jtulach@146: *
The read(b)
method has the same effect as:
jtulach@146: *
jtulach@146: * jtulach@146: * @param b the buffer into which the data is read. jtulach@146: * @return the total number of bytes read into the buffer, or jtulach@146: *jtulach@146: * read(b, 0, b.length) jtulach@146: *
-1
if there is no more data because the end
jtulach@146: * of the stream has been reached.
jtulach@146: * @exception IOException if the first byte cannot be read for any reason
jtulach@146: * other than end of file, the stream has been closed and the underlying
jtulach@146: * input stream does not support reading after close, or another I/O
jtulach@146: * error occurs.
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: * @see java.io.InputStream#read(byte[], int, int)
jtulach@146: */
jtulach@146: public final int read(byte b[]) throws IOException {
jtulach@146: return in.read(b, 0, b.length);
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * Reads up to len
bytes of data from the contained
jtulach@146: * input stream into an array of bytes. An attempt is made to read
jtulach@146: * as many as len
bytes, but a smaller number may be read,
jtulach@146: * possibly zero. The number of bytes actually read is returned as an
jtulach@146: * integer.
jtulach@146: *
jtulach@146: * This method blocks until input data is available, end of file is jtulach@146: * detected, or an exception is thrown. jtulach@146: * jtulach@146: *
If len
is zero, then no bytes are read and
jtulach@146: * 0
is returned; otherwise, there is an attempt to read at
jtulach@146: * least one byte. If no byte is available because the stream is at end of
jtulach@146: * file, the value -1
is returned; otherwise, at least one
jtulach@146: * byte is read and stored into b
.
jtulach@146: *
jtulach@146: *
The first byte read is stored into element b[off]
, the
jtulach@146: * next one into b[off+1]
, and so on. The number of bytes read
jtulach@146: * is, at most, equal to len
. Let k be the number of
jtulach@146: * bytes actually read; these bytes will be stored in elements
jtulach@146: * b[off]
through b[off+
k-1]
,
jtulach@146: * leaving elements b[off+
k]
through
jtulach@146: * b[off+len-1]
unaffected.
jtulach@146: *
jtulach@146: *
In every case, elements b[0]
through
jtulach@146: * b[off]
and elements b[off+len]
through
jtulach@146: * b[b.length-1]
are unaffected.
jtulach@146: *
jtulach@146: * @param b the buffer into which the data is read.
jtulach@146: * @param off the start offset in the destination array b
jtulach@146: * @param len the maximum number of bytes read.
jtulach@146: * @return the total number of bytes read into the buffer, or
jtulach@146: * -1
if there is no more data because the end
jtulach@146: * of the stream has been reached.
jtulach@146: * @exception NullPointerException If b
is null
.
jtulach@146: * @exception IndexOutOfBoundsException If off
is negative,
jtulach@146: * len
is negative, or len
is greater than
jtulach@146: * b.length - off
jtulach@146: * @exception IOException if the first byte cannot be read for any reason
jtulach@146: * other than end of file, the stream has been closed and the underlying
jtulach@146: * input stream does not support reading after close, or another I/O
jtulach@146: * error occurs.
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: * @see java.io.InputStream#read(byte[], int, int)
jtulach@146: */
jtulach@146: public final int read(byte b[], int off, int len) throws IOException {
jtulach@146: return in.read(b, off, len);
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the readFully
jtulach@146: * method of DataInput
.
jtulach@146: *
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @param b the buffer into which the data is read.
jtulach@146: * @exception EOFException if this input stream reaches the end before
jtulach@146: * reading all the bytes.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: */
jtulach@146: public final void readFully(byte b[]) throws IOException {
jtulach@146: readFully(b, 0, b.length);
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the readFully
jtulach@146: * method of DataInput
.
jtulach@146: *
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @param b the buffer into which the data is read.
jtulach@146: * @param off the start offset of the data.
jtulach@146: * @param len the number of bytes to read.
jtulach@146: * @exception EOFException if this input stream reaches the end before
jtulach@146: * reading all the bytes.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: */
jtulach@146: public final void readFully(byte b[], int off, int len) throws IOException {
jtulach@146: if (len < 0)
jtulach@146: throw new IndexOutOfBoundsException();
jtulach@146: int n = 0;
jtulach@146: while (n < len) {
jtulach@146: int count = in.read(b, off + n, len - n);
jtulach@146: if (count < 0)
jtulach@146: throw new EOFException();
jtulach@146: n += count;
jtulach@146: }
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the skipBytes
jtulach@146: * method of DataInput
.
jtulach@146: *
jtulach@146: * Bytes for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @param n the number of bytes to be skipped.
jtulach@146: * @return the actual number of bytes skipped.
jtulach@146: * @exception IOException if the contained input stream does not support
jtulach@146: * seek, or the stream has been closed and
jtulach@146: * the contained input stream does not support
jtulach@146: * reading after close, or another I/O error occurs.
jtulach@146: */
jtulach@146: public final int skipBytes(int n) throws IOException {
jtulach@146: int total = 0;
jtulach@146: int cur = 0;
jtulach@146:
jtulach@146: while ((total
jtulach@146: * Bytes for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @return the
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @return the next byte of this input stream as a signed 8-bit
jtulach@146: *
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @return the next byte of this input stream, interpreted as an
jtulach@146: * unsigned 8-bit number.
jtulach@146: * @exception EOFException if this input stream has reached the end.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: */
jtulach@146: public final int readUnsignedByte() throws IOException {
jtulach@146: int ch = in.read();
jtulach@146: if (ch < 0)
jtulach@146: throw new EOFException();
jtulach@146: return ch;
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @return the next two bytes of this input stream, interpreted as a
jtulach@146: * signed 16-bit number.
jtulach@146: * @exception EOFException if this input stream reaches the end before
jtulach@146: * reading two bytes.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: */
jtulach@146: public final short readShort() throws IOException {
jtulach@146: int ch1 = in.read();
jtulach@146: int ch2 = in.read();
jtulach@146: if ((ch1 | ch2) < 0)
jtulach@146: throw new EOFException();
jtulach@146: return (short)((ch1 << 8) + (ch2 << 0));
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @return the next two bytes of this input stream, interpreted as an
jtulach@146: * unsigned 16-bit integer.
jtulach@146: * @exception EOFException if this input stream reaches the end before
jtulach@146: * reading two bytes.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: */
jtulach@146: public final int readUnsignedShort() throws IOException {
jtulach@146: int ch1 = in.read();
jtulach@146: int ch2 = in.read();
jtulach@146: if ((ch1 | ch2) < 0)
jtulach@146: throw new EOFException();
jtulach@146: return (ch1 << 8) + (ch2 << 0);
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @return the next two bytes of this input stream, interpreted as a
jtulach@146: *
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @return the next four bytes of this input stream, interpreted as an
jtulach@146: *
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @return the next eight bytes of this input stream, interpreted as a
jtulach@146: *
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @return the next four bytes of this input stream, interpreted as a
jtulach@146: *
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @return the next eight bytes of this input stream, interpreted as a
jtulach@146: *
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @deprecated This method does not properly convert bytes to characters.
jtulach@146: * As of JDK 1.1, the preferred way to read lines of text is via the
jtulach@146: *
jtulach@146: * Bytes
jtulach@146: * for this operation are read from the contained
jtulach@146: * input stream.
jtulach@146: *
jtulach@146: * @return a Unicode string.
jtulach@146: * @exception EOFException if this input stream reaches the end before
jtulach@146: * reading all the bytes.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @exception UTFDataFormatException if the bytes do not represent a valid
jtulach@146: * modified UTF-8 encoding of a string.
jtulach@146: * @see java.io.DataInputStream#readUTF(java.io.DataInput)
jtulach@146: */
jtulach@146: public final String readUTF() throws IOException {
jtulach@146: return readUTF(this);
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * Reads from the
jtulach@146: * stream readBoolean
jtulach@146: * method of DataInput
.
jtulach@146: * boolean
value read.
jtulach@146: * @exception EOFException if this input stream has reached the end.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: */
jtulach@146: public final boolean readBoolean() throws IOException {
jtulach@146: int ch = in.read();
jtulach@146: if (ch < 0)
jtulach@146: throw new EOFException();
jtulach@146: return (ch != 0);
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the readByte
jtulach@146: * method of DataInput
.
jtulach@146: * byte
.
jtulach@146: * @exception EOFException if this input stream has reached the end.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: */
jtulach@146: public final byte readByte() throws IOException {
jtulach@146: int ch = in.read();
jtulach@146: if (ch < 0)
jtulach@146: throw new EOFException();
jtulach@146: return (byte)(ch);
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the readUnsignedByte
jtulach@146: * method of DataInput
.
jtulach@146: * readShort
jtulach@146: * method of DataInput
.
jtulach@146: * readUnsignedShort
jtulach@146: * method of DataInput
.
jtulach@146: * readChar
jtulach@146: * method of DataInput
.
jtulach@146: * char
.
jtulach@146: * @exception EOFException if this input stream reaches the end before
jtulach@146: * reading two bytes.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: */
jtulach@146: public final char readChar() throws IOException {
jtulach@146: int ch1 = in.read();
jtulach@146: int ch2 = in.read();
jtulach@146: if ((ch1 | ch2) < 0)
jtulach@146: throw new EOFException();
jtulach@146: return (char)((ch1 << 8) + (ch2 << 0));
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the readInt
jtulach@146: * method of DataInput
.
jtulach@146: * int
.
jtulach@146: * @exception EOFException if this input stream reaches the end before
jtulach@146: * reading four bytes.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: */
jtulach@146: public final int readInt() throws IOException {
jtulach@146: int ch1 = in.read();
jtulach@146: int ch2 = in.read();
jtulach@146: int ch3 = in.read();
jtulach@146: int ch4 = in.read();
jtulach@146: if ((ch1 | ch2 | ch3 | ch4) < 0)
jtulach@146: throw new EOFException();
jtulach@146: return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + (ch4 << 0));
jtulach@146: }
jtulach@146:
jtulach@146: private byte readBuffer[] = new byte[8];
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the readLong
jtulach@146: * method of DataInput
.
jtulach@146: * long
.
jtulach@146: * @exception EOFException if this input stream reaches the end before
jtulach@146: * reading eight bytes.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: */
jtulach@146: public final long readLong() throws IOException {
jtulach@146: readFully(readBuffer, 0, 8);
jtulach@146: return (((long)readBuffer[0] << 56) +
jtulach@146: ((long)(readBuffer[1] & 255) << 48) +
jtulach@146: ((long)(readBuffer[2] & 255) << 40) +
jtulach@146: ((long)(readBuffer[3] & 255) << 32) +
jtulach@146: ((long)(readBuffer[4] & 255) << 24) +
jtulach@146: ((readBuffer[5] & 255) << 16) +
jtulach@146: ((readBuffer[6] & 255) << 8) +
jtulach@146: ((readBuffer[7] & 255) << 0));
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the readFloat
jtulach@146: * method of DataInput
.
jtulach@146: * float
.
jtulach@146: * @exception EOFException if this input stream reaches the end before
jtulach@146: * reading four bytes.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @see java.io.DataInputStream#readInt()
jtulach@146: * @see java.lang.Float#intBitsToFloat(int)
jtulach@146: */
jtulach@146: public final float readFloat() throws IOException {
jtulach@146: return Float.intBitsToFloat(readInt());
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the readDouble
jtulach@146: * method of DataInput
.
jtulach@146: * double
.
jtulach@146: * @exception EOFException if this input stream reaches the end before
jtulach@146: * reading eight bytes.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @see java.io.DataInputStream#readLong()
jtulach@146: * @see java.lang.Double#longBitsToDouble(long)
jtulach@146: */
jtulach@146: public final double readDouble() throws IOException {
jaroslav@185: int hi = readInt();
jaroslav@185: int low = readInt();
jaroslav@185: return toDouble(hi, low);
jaroslav@185: }
jaroslav@185:
jaroslav@185: @JavaScriptBody(args={ "hi", "low" },
jaroslav@185: body=
jaroslav@185: "if (low == 0) {\n"
jaroslav@185: + " if (hi === 0x7ff00000) return Number.POSITIVE_INFINITY;\n"
jaroslav@185: + " if (hi === 0xfff00000) return Number.NEGATIVE_INFINITY;\n"
jaroslav@185: + "}\n"
jaroslav@185: + "if (hi >= 0x7ff00000 && hi <= 0x7fffffff) return Number.NaN;\n"
jaroslav@185: + "if (hi >= 0xfff00000 && hi <= 0xffffffff) return Number.NaN;\n"
jaroslav@185: + "var s = (hi & 0x80000000) === 0 ? 1 : -1;\n"
jaroslav@185: + "var e = (hi >> 20) & 0x7ff;\n"
jaroslav@185: + "var to32 = low >> 0;\n"
jaroslav@185: + "if (e === 0) {\n"
jaroslav@185: + " if (to32 & 0x80000000) {\n"
jaroslav@185: + " hi = hi << 1 + 1; low = low << 1;\n"
jaroslav@185: + " } else {\n"
jaroslav@185: + " hi = hi << 1; low = low << 1;\n"
jaroslav@185: + " }\n"
jaroslav@185: + "} else {\n"
jaroslav@185: + " hi = (hi & 0xfffff) | 0x100000;\n"
jaroslav@185: + "}\n"
jaroslav@185: + "to32 = low >> 0;\n"
jaroslav@185: + "var m = Math.pow(2.0, 32) * hi + to32;\n"
jaroslav@185: + "var r = s * m * Math.pow(2.0, e - 1075);\n"
jaroslav@185: + "//throw 'exp: ' + e + ' sign: ' + s + ' hi:' + hi + ' low: ' + low + ' m: ' + m + ' r: ' + r;\n"
jaroslav@185: + "return r;\n"
jaroslav@185: )
jaroslav@185: private static double toDouble(int hi, int low) {
jaroslav@185: long both = hi;
jaroslav@185: both = (both << 32) & low;
jaroslav@185: return Double.doubleToLongBits(both);
jtulach@146: }
jtulach@146:
jtulach@146: private char lineBuffer[];
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the readLine
jtulach@146: * method of DataInput
.
jtulach@146: * BufferedReader.readLine()
method. Programs that use the
jtulach@146: * DataInputStream
class to read lines can be converted to use
jtulach@146: * the BufferedReader
class by replacing code of the form:
jtulach@146: *
jtulach@146: * with:
jtulach@146: *
jtulach@146: * DataInputStream d = new DataInputStream(in);
jtulach@146: *
jtulach@146: *
jtulach@146: * @return the next line of text from this input stream.
jtulach@146: * @exception IOException if an I/O error occurs.
jtulach@146: * @see java.io.BufferedReader#readLine()
jtulach@146: * @see java.io.FilterInputStream#in
jtulach@146: */
jtulach@146: @Deprecated
jtulach@146: public final String readLine() throws IOException {
jtulach@146: char buf[] = lineBuffer;
jtulach@146:
jtulach@146: if (buf == null) {
jtulach@146: buf = lineBuffer = new char[128];
jtulach@146: }
jtulach@146:
jtulach@146: int room = buf.length;
jtulach@146: int offset = 0;
jtulach@146: int c;
jtulach@146:
jtulach@146: loop: while (true) {
jtulach@146: switch (c = in.read()) {
jtulach@146: case -1:
jtulach@146: case '\n':
jtulach@146: break loop;
jtulach@146:
jtulach@146: case '\r':
jtulach@146: int c2 = in.read();
jtulach@146: if ((c2 != '\n') && (c2 != -1)) {
jtulach@146: if (!(in instanceof PushbackInputStream)) {
jtulach@146: this.in = new PushbackInputStream(in);
jtulach@146: }
jtulach@146: ((PushbackInputStream)in).unread(c2);
jtulach@146: }
jtulach@146: break loop;
jtulach@146:
jtulach@146: default:
jtulach@146: if (--room < 0) {
jtulach@146: buf = new char[offset + 128];
jtulach@146: room = buf.length - offset - 1;
jaroslav@149: arraycopy(lineBuffer, 0, buf, 0, offset);
jtulach@146: lineBuffer = buf;
jtulach@146: }
jtulach@146: buf[offset++] = (char) c;
jtulach@146: break;
jtulach@146: }
jtulach@146: }
jtulach@146: if ((c == -1) && (offset == 0)) {
jtulach@146: return null;
jtulach@146: }
jtulach@146: return String.copyValueOf(buf, 0, offset);
jtulach@146: }
jtulach@146:
jtulach@146: /**
jtulach@146: * See the general contract of the
jtulach@146: * BufferedReader d
jtulach@146: * = new BufferedReader(new InputStreamReader(in));
jtulach@146: *
readUTF
jtulach@146: * method of DataInput
.
jtulach@146: * in
a representation
jtulach@146: * of a Unicode character string encoded in
jtulach@146: * modified UTF-8 format;
jtulach@146: * this string of characters is then returned as a String
.
jtulach@146: * The details of the modified UTF-8 representation
jtulach@146: * are exactly the same as for the readUTF
jtulach@146: * method of DataInput
.
jtulach@146: *
jtulach@146: * @param in a data input stream.
jtulach@146: * @return a Unicode string.
jtulach@146: * @exception EOFException if the input stream reaches the end
jtulach@146: * before all the bytes.
jtulach@146: * @exception IOException the stream has been closed and the contained
jtulach@146: * input stream does not support reading after close, or
jtulach@146: * another I/O error occurs.
jtulach@146: * @exception UTFDataFormatException if the bytes do not represent a
jtulach@146: * valid modified UTF-8 encoding of a Unicode string.
jtulach@146: * @see java.io.DataInputStream#readUnsignedShort()
jtulach@146: */
jtulach@146: public final static String readUTF(DataInput in) throws IOException {
jtulach@146: int utflen = in.readUnsignedShort();
jtulach@146: byte[] bytearr = null;
jtulach@146: char[] chararr = null;
jtulach@146: if (in instanceof DataInputStream) {
jtulach@146: DataInputStream dis = (DataInputStream)in;
jtulach@146: if (dis.bytearr.length < utflen){
jtulach@146: dis.bytearr = new byte[utflen*2];
jtulach@146: dis.chararr = new char[utflen*2];
jtulach@146: }
jtulach@146: chararr = dis.chararr;
jtulach@146: bytearr = dis.bytearr;
jtulach@146: } else {
jtulach@146: bytearr = new byte[utflen];
jtulach@146: chararr = new char[utflen];
jtulach@146: }
jtulach@146:
jtulach@146: int c, char2, char3;
jtulach@146: int count = 0;
jtulach@146: int chararr_count=0;
jtulach@146:
jtulach@146: in.readFully(bytearr, 0, utflen);
jtulach@146:
jtulach@146: while (count < utflen) {
jtulach@146: c = (int) bytearr[count] & 0xff;
jtulach@146: if (c > 127) break;
jtulach@146: count++;
jtulach@146: chararr[chararr_count++]=(char)c;
jtulach@146: }
jtulach@146:
jtulach@146: while (count < utflen) {
jtulach@146: c = (int) bytearr[count] & 0xff;
jtulach@146: switch (c >> 4) {
jtulach@146: case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
jtulach@146: /* 0xxxxxxx*/
jtulach@146: count++;
jtulach@146: chararr[chararr_count++]=(char)c;
jtulach@146: break;
jtulach@146: case 12: case 13:
jtulach@146: /* 110x xxxx 10xx xxxx*/
jtulach@146: count += 2;
jtulach@146: if (count > utflen)
jtulach@146: throw new UTFDataFormatException(
jtulach@146: "malformed input: partial character at end");
jtulach@146: char2 = (int) bytearr[count-1];
jtulach@146: if ((char2 & 0xC0) != 0x80)
jtulach@146: throw new UTFDataFormatException(
jtulach@146: "malformed input around byte " + count);
jtulach@146: chararr[chararr_count++]=(char)(((c & 0x1F) << 6) |
jtulach@146: (char2 & 0x3F));
jtulach@146: break;
jtulach@146: case 14:
jtulach@146: /* 1110 xxxx 10xx xxxx 10xx xxxx */
jtulach@146: count += 3;
jtulach@146: if (count > utflen)
jtulach@146: throw new UTFDataFormatException(
jtulach@146: "malformed input: partial character at end");
jtulach@146: char2 = (int) bytearr[count-2];
jtulach@146: char3 = (int) bytearr[count-1];
jtulach@146: if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80))
jtulach@146: throw new UTFDataFormatException(
jtulach@146: "malformed input around byte " + (count-1));
jtulach@146: chararr[chararr_count++]=(char)(((c & 0x0F) << 12) |
jtulach@146: ((char2 & 0x3F) << 6) |
jtulach@146: ((char3 & 0x3F) << 0));
jtulach@146: break;
jtulach@146: default:
jtulach@146: /* 10xx xxxx, 1111 xxxx */
jtulach@146: throw new UTFDataFormatException(
jtulach@146: "malformed input around byte " + count);
jtulach@146: }
jtulach@146: }
jtulach@146: // The number of chars produced may be less than utflen
jtulach@146: return new String(chararr, 0, chararr_count);
jtulach@146: }
jaroslav@149: static void arraycopy(char[] value, int srcBegin, char[] dst, int dstBegin, int count) {
jaroslav@149: while (count-- > 0) {
jaroslav@149: dst[dstBegin++] = value[srcBegin++];
jaroslav@149: }
jaroslav@149: }
jtulach@146: }