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+LEDataInputStream

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Ryszard Wiśniewski 2010-03-22 16:06:43 +01:00
parent 1d4d4e341c
commit 8ef7d361b2
1 changed files with 319 additions and 0 deletions
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src/com/mindprod/ledatastream/LEDataInputStream.java Normal file
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/*
* @(#)LEDataInputStream.java
*
* Summary: Little-Endian version of DataInputStream.
*
* Copyright: (c) 1998-2010 Roedy Green, Canadian Mind Products, http://mindprod.com
*
* Licence: This software may be copied and used freely for any purpose but military.
* http://mindprod.com/contact/nonmil.html
*
* Requires: JDK 1.1+
*
* Created with: IntelliJ IDEA IDE.
*
* Version History:
* 1.8 2007-05-24
*/
package com.mindprod.ledatastream;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Little-Endian version of DataInputStream.
* <p/>
* Very similar to DataInputStream except it reads
* little-endian instead of big-endian binary data. We can't extend
* DataInputStream directly since it has only final methods, though
* DataInputStream itself is not final. This forces us implement
* LEDataInputStream with a DataInputStream object, and use wrapper methods.
*
* @author Roedy Green, Canadian Mind Products
* @version 1.8 2007-05-24
* @since 1998
*/
public final class LEDataInputStream implements DataInput
{
// ------------------------------ CONSTANTS ------------------------------
/**
* undisplayed copyright notice.
*
* @noinspection UnusedDeclaration
*/
private static final String EMBEDDED_COPYRIGHT =
"copyright (c) 1999-2010 Roedy Green, Canadian Mind Products, http://mindprod.com";
// ------------------------------ FIELDS ------------------------------
/**
* to get at the big-Endian methods of a basic DataInputStream
*
* @noinspection WeakerAccess
*/
protected final DataInputStream dis;
/**
* to get at the a basic readBytes method.
*
* @noinspection WeakerAccess
*/
protected final InputStream is;
/**
* work array for buffering input.
*
* @noinspection WeakerAccess
*/
protected final byte[] work;
// -------------------------- PUBLIC STATIC METHODS --------------------------
/**
* Note. This is a STATIC method!
*
* @param in stream to read UTF chars from (endian irrelevant)
*
* @return string from stream
* @throws IOException if read fails.
*/
public static String readUTF( DataInput in ) throws IOException
{
return DataInputStream.readUTF( in );
}
// -------------------------- PUBLIC INSTANCE METHODS --------------------------
/**
* constructor.
*
* @param in binary inputstream of little-endian data.
*/
public LEDataInputStream( InputStream in )
{
this.is = in;
this.dis = new DataInputStream( in );
work = new byte[8];
}
/**
* close.
*
* @throws IOException if close fails.
*/
public final void close() throws IOException
{
dis.close();
}
/**
* Read bytes. Watch out, read may return fewer bytes than requested.
*
* @param ba where the bytes go.
* @param off offset in buffer, not offset in file.
* @param len count of bytes to read.
*
* @return how many bytes read.
* @throws IOException if read fails.
*/
public final int read( byte ba[], int off, int len ) throws IOException
{
// For efficiency, we avoid one layer of wrapper
return is.read( ba, off, len );
}
/**
* read only a one-byte boolean.
*
* @return true or false.
* @throws IOException if read fails.
* @see java.io.DataInput#readBoolean()
*/
public final boolean readBoolean() throws IOException
{
return dis.readBoolean();
}
/**
* read byte.
*
* @return the byte read.
* @throws IOException if read fails.
* @see java.io.DataInput#readByte()
*/
public final byte readByte() throws IOException
{
return dis.readByte();
}
/**
* Read on char. like DataInputStream.readChar except little endian.
*
* @return little endian 16-bit unicode char from the stream.
* @throws IOException if read fails.
*/
public final char readChar() throws IOException
{
dis.readFully( work, 0, 2 );
return ( char ) ( ( work[ 1 ] & 0xff ) << 8 | ( work[ 0 ] & 0xff ) );
}
/**
* Read a double. like DataInputStream.readDouble except little endian.
*
* @return little endian IEEE double from the datastream.
* @throws IOException
*/
public final double readDouble() throws IOException
{
return Double.longBitsToDouble( readLong() );
}
/**
* Read one float. Like DataInputStream.readFloat except little endian.
*
* @return little endian IEEE float from the datastream.
* @throws IOException if read fails.
*/
public final float readFloat() throws IOException
{
return Float.intBitsToFloat( readInt() );
}
/**
* Read bytes until the array is filled.
*
* @see java.io.DataInput#readFully(byte[])
*/
public final void readFully( byte ba[] ) throws IOException
{
dis.readFully( ba, 0, ba.length );
}
/**
* Read bytes until the count is satisfied.
*
* @throws IOException if read fails.
* @see java.io.DataInput#readFully(byte[],int,int)
*/
public final void readFully( byte ba[],
int off,
int len ) throws IOException
{
dis.readFully( ba, off, len );
}
/**
* Read an int, 32-bits. Like DataInputStream.readInt except little endian.
*
* @return little-endian binary int from the datastream
* @throws IOException if read fails.
*/
public final int readInt() throws IOException
{
dis.readFully( work, 0, 4 );
return ( work[ 3 ] ) << 24
| ( work[ 2 ] & 0xff ) << 16
| ( work[ 1 ] & 0xff ) << 8
| ( work[ 0 ] & 0xff );
}
/**
* Read a line.
*
* @return a rough approximation of the 8-bit stream as a 16-bit unicode string
* @throws IOException
* @noinspection deprecation
* @deprecated This method does not properly convert bytes to characters. Use a Reader instead with a little-endian
* encoding.
*/
public final String readLine() throws IOException
{
return dis.readLine();
}
/**
* read a long, 64-bits. Like DataInputStream.readLong except little endian.
*
* @return little-endian binary long from the datastream.
* @throws IOException
*/
public final long readLong() throws IOException
{
dis.readFully( work, 0, 8 );
return ( long ) ( work[ 7 ] ) << 56
|
/* long cast needed or shift done modulo 32 */
( long ) ( work[ 6 ] & 0xff ) << 48
| ( long ) ( work[ 5 ] & 0xff ) << 40
| ( long ) ( work[ 4 ] & 0xff ) << 32
| ( long ) ( work[ 3 ] & 0xff ) << 24
| ( long ) ( work[ 2 ] & 0xff ) << 16
| ( long ) ( work[ 1 ] & 0xff ) << 8
| ( long ) ( work[ 0 ] & 0xff );
}
/**
* Read short, 16-bits. Like DataInputStream.readShort except little endian.
*
* @return little endian binary short from stream.
* @throws IOException if read fails.
*/
public final short readShort() throws IOException
{
dis.readFully( work, 0, 2 );
return ( short ) ( ( work[ 1 ] & 0xff ) << 8 | ( work[ 0 ] & 0xff ) );
}
/**
* Read UTF counted string.
*
* @return String read.
*/
public final String readUTF() throws IOException
{
return dis.readUTF();
}
/**
* Read an unsigned byte. Note: returns an int, even though says Byte (non-Javadoc)
*
* @throws IOException if read fails.
* @see java.io.DataInput#readUnsignedByte()
*/
public final int readUnsignedByte() throws IOException
{
return dis.readUnsignedByte();
}
/**
* Read an unsigned short, 16 bits. Like DataInputStream.readUnsignedShort except little endian. Note, returns int
* even though it reads a short.
*
* @return little-endian int from the stream.
* @throws IOException if read fails.
*/
public final int readUnsignedShort() throws IOException
{
dis.readFully( work, 0, 2 );
return ( ( work[ 1 ] & 0xff ) << 8 | ( work[ 0 ] & 0xff ) );
}
/**
* Skip over bytes in the stream. 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.
* @throws IOException if an I/O error occurs.
*/
public final int skipBytes( int n ) throws IOException
{
return dis.skipBytes( n );
}
}