oracle.dss.util.xdo.template.flash
Class BitsReader

java.lang.Object
  oracle.dss.util.xdo.template.flash.BitsReader

Direct Known Subclasses:

SWFReader

public class BitsReader
extends java.lang.Object

Read bits from a specified byte array Bit position is like this. 0000000 | | | +-- position(7) +-------- position(0) Example: BitsReader br = new BitsReader( data, 0, 0 ); int val = br.readBits( 5 ); // Read first 5 bits int val2 = br.readBits( 10 ); // Read next 10 bits ...

Field Summary

protected int	mBitPos
protected int	mBytePos
protected byte[]	mData

Constructor Summary

BitsReader(byte[] data, int bytePos, int bitPos)

Method Summary

int	getBitPosition()
int	getBytePosition()
static int	readBits(byte data, int startBit, int endBit) Read bits within a byte.
int	readBits(int numBits) Read specified bits from the current position.
static int	readBits(int data, int startBit, int endBit) Read bits within an int.
void	skipFilledBits()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

mData

protected byte[] mData

mBytePos

protected int mBytePos

mBitPos

protected int mBitPos

Constructor Detail

BitsReader

public BitsReader(byte[] data,
                  int bytePos,
                  int bitPos)

Method Detail

readBits

public int readBits(int numBits)

Read specified bits from the current position. The current position will be moved after this operation.

Parameters:

numBits - number of bits (must be <=32)

Returns:

value

readBits

public static int readBits(byte data,
                           int startBit,
                           int endBit)

Read bits within a byte. Bit position is like this. 0000000 | | | +-- position(7) +-------- position(0)

Parameters:

data -

start - start bit position (0-7)

end - end bit position (0-7)

Returns:

readBits

public static int readBits(int data,
                           int startBit,
                           int endBit)

Read bits within an int.

Parameters:

data -

startBit -

endBit -

Returns:

skipFilledBits

public void skipFilledBits()

getBytePosition

public int getBytePosition()

getBitPosition

public int getBitPosition()