org.apache.pdfbox.io.ccitt
Class PackedBitArray

java.lang.Object
  org.apache.pdfbox.io.ccitt.PackedBitArray

public class PackedBitArray
extends Object

Represents an array of bits packed in a byte array of fixed size.

Version:

$Revision$

Constructor Summary

PackedBitArray(int bitCount)
Constructs a new bit array.

Method Summary

void	clear() Clear all bits in the array.
void	clear(int offset) Clears a bit at the given offset.
void	clearBits(int offset, int length) Clears a run of bits at the given offset.
int	getBitCount() Returns the number of bits maintained by this array.
int	getByteCount() Returns the size of the byte buffer for this array.
byte[]	getData() Returns the underlying byte buffer.
void	set(int offset) Sets a bit at the given offset.
void	setBits(int offset, int length) Sets a run of bits at the given offset to either 1.
void	setBits(int offset, int length, int bit) Sets a run of bits at the given offset to either 1 or 0.
static String	toBitString(byte data) Converts a byte to a "binary" String of 0s and 1s.
static String	toBitString(byte[] data) Converts a series of bytes to a "binary" String of 0s and 1s.
static String	toBitString(byte[] data, int start, int len) Converts a series of bytes to a "binary" String of 0s and 1s.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

PackedBitArray

public PackedBitArray(int bitCount)

Constructs a new bit array.

Parameters:

bitCount - the number of bits to maintain

Method Detail

set

public void set(int offset)

Sets a bit at the given offset.

Parameters:

offset - the offset

clear

public void clear(int offset)

Clears a bit at the given offset.

Parameters:

offset - the offset

setBits

public void setBits(int offset,
                    int length,
                    int bit)

Sets a run of bits at the given offset to either 1 or 0.

Parameters:

offset - the offset

length - the number of bits to set

bit - 1 to set the bit, 0 to clear it

setBits

public void setBits(int offset,
                    int length)

Sets a run of bits at the given offset to either 1.

Parameters:

offset - the offset

length - the number of bits to set

clearBits

public void clearBits(int offset,
                      int length)

Clears a run of bits at the given offset.

Parameters:

offset - the offset

length - the number of bits to clear

clear

public void clear()

Clear all bits in the array.

getBitCount

public int getBitCount()

Returns the number of bits maintained by this array.

Returns:

the number of bits

getByteCount

public int getByteCount()

Returns the size of the byte buffer for this array.

Returns:

the size of the byte buffer

getData

public byte[] getData()

Returns the underlying byte buffer.

Note: the actual buffer is returned. If it's manipulated the content of the bit array changes.

Returns:

the underlying data buffer

toString

public String toString()

Overrides:

toString in class Object

toBitString

public static String toBitString(byte data)

Converts a byte to a "binary" String of 0s and 1s.

Parameters:

data - the value to convert

Returns:

the binary string

toBitString

public static String toBitString(byte[] data)

Converts a series of bytes to a "binary" String of 0s and 1s.

Parameters:

data - the data

Returns:

the binary string

toBitString

public static String toBitString(byte[] data,
                                 int start,
                                 int len)

Converts a series of bytes to a "binary" String of 0s and 1s.

Parameters:

data - the data

start - the start offset

len - the number of bytes to convert

Returns:

the binary string