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 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
    Returns the number of bits maintained by this array.
    int
    Returns the size of the byte buffer for this array.
    byte[]
    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.

    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