Package 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

    Constructors
    Constructor
    Description
    PackedBitArray(int bitCount)
    Constructs a new bit array.

  • Method Summary

    Modifier and Type
    Method
    Description
    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 Details

    • PackedBitArray

      public PackedBitArray(int bitCount)
      Constructs a new bit array.
      Parameters:
      bitCount - the number of bits to maintain

  • Method Details

    • 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