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Diffstat (limited to 'src/demos/util/LEDataInputStream.java')
| -rw-r--r-- | src/demos/util/LEDataInputStream.java | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/demos/util/LEDataInputStream.java b/src/demos/util/LEDataInputStream.java new file mode 100644 index 0000000..b391885 --- /dev/null +++ b/src/demos/util/LEDataInputStream.java @@ -0,0 +1,223 @@ +/* + * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * - Redistribution of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * - Redistribution in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * Neither the name of Sun Microsystems, Inc. or the names of + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * This software is provided "AS IS," without a warranty of any kind. ALL + * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, + * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A + * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN + * MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR + * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR + * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR + * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR + * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE + * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, + * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF + * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. + * + * You acknowledge that this software is not designed or intended for use + * in the design, construction, operation or maintenance of any nuclear + * facility. + * + * Sun gratefully acknowledges that this software was originally authored + * and developed by Kenneth Bradley Russell and Christopher John Kline. + */ + +package demos.util; + +import java.io.DataInput; +import java.io.DataInputStream; +import java.io.FilterInputStream; +import java.io.InputStream; +import java.io.FileInputStream; +import java.io.EOFException; +import java.io.IOException; + +/** + * Little Endian Data Input Stream. + * + * This class implements an input stream filter to allow reading + * of java native datatypes from an input stream which has those + * native datatypes stored in a little endian byte order.<p> + * + * This is the sister class of the DataInputStream which allows + * for reading of java native datatypes from an input stream with + * the datatypes stored in big endian byte order.<p> + * + * This class implements the minimum required and calls DataInputStream + * for some of the required methods for DataInput.<p> + * + * Not all methods are implemented due to lack of immediatte requirement + * for that functionality. It is not clear if it is ever going to be + * functionally required to be able to read UTF data in a LittleEndianManner<p> + * + * @author Robin Luiten + * @version 1.1 15/Dec/1997 + */ +public class LEDataInputStream extends FilterInputStream implements DataInput +{ + /** + * To reuse some of the non endian dependent methods from + * DataInputStreams methods. + */ + DataInputStream dataIn; + + public LEDataInputStream(InputStream in) + { + super(in); + dataIn = new DataInputStream(in); + } + + public void close() throws IOException + { + dataIn.close(); // better close as we create it. + // this will close underlying as well. + } + + public synchronized final int read(byte b[]) throws IOException + { + return dataIn.read(b, 0, b.length); + } + + public synchronized final int read(byte b[], int off, int len) throws IOException + { + int rl = dataIn.read(b, off, len); + return rl; + } + + public final void readFully(byte b[]) throws IOException + { + dataIn.readFully(b, 0, b.length); + } + + public final void readFully(byte b[], int off, int len) throws IOException + { + dataIn.readFully(b, off, len); + } + + public final int skipBytes(int n) throws IOException + { + return dataIn.skipBytes(n); + } + + public final boolean readBoolean() throws IOException + { + int ch = dataIn.read(); + if (ch < 0) + throw new EOFException(); + return (ch != 0); + } + + public final byte readByte() throws IOException + { + int ch = dataIn.read(); + if (ch < 0) + throw new EOFException(); + return (byte)(ch); + } + + public final int readUnsignedByte() throws IOException + { + int ch = dataIn.read(); + if (ch < 0) + throw new EOFException(); + return ch; + } + + public final short readShort() throws IOException + { + int ch1 = dataIn.read(); + int ch2 = dataIn.read(); + if ((ch1 | ch2) < 0) + throw new EOFException(); + return (short)((ch1 << 0) + (ch2 << 8)); + } + + public final int readUnsignedShort() throws IOException + { + int ch1 = dataIn.read(); + int ch2 = dataIn.read(); + if ((ch1 | ch2) < 0) + throw new EOFException(); + return (ch1 << 0) + (ch2 << 8); + } + + public final char readChar() throws IOException + { + int ch1 = dataIn.read(); + int ch2 = dataIn.read(); + if ((ch1 | ch2) < 0) + throw new EOFException(); + return (char)((ch1 << 0) + (ch2 << 8)); + } + + public final int readInt() throws IOException + { + int ch1 = dataIn.read(); + int ch2 = dataIn.read(); + int ch3 = dataIn.read(); + int ch4 = dataIn.read(); + if ((ch1 | ch2 | ch3 | ch4) < 0) + throw new EOFException(); + return ((ch1 << 0) + (ch2 << 8) + (ch3 << 16) + (ch4 << 24)); + } + + public final long readLong() throws IOException + { + int i1 = readInt(); + int i2 = readInt(); + return ((long)(i1) & 0xFFFFFFFFL) + (i2 << 32); + } + + public final float readFloat() throws IOException + { + return Float.intBitsToFloat(readInt()); + } + + public final double readDouble() throws IOException + { + return Double.longBitsToDouble(readLong()); + } + + /** + * dont call this it is not implemented. + * @return empty new string + **/ + public final String readLine() throws IOException + { + return new String(); + } + + /** + * dont call this it is not implemented + * @return empty new string + **/ + public final String readUTF() throws IOException + { + return new String(); + } + + /** + * dont call this it is not implemented + * @return empty new string + **/ + public final static String readUTF(DataInput in) throws IOException + { + return new String(); + } +} + |