java.lang.Object
- it.unimi.dsi.io.InputBitStream
- - it.unimi.dsi.io.DebugInputBitStream

All Implemented Interfaces:

BooleanIterator, Closeable, Flushable, AutoCloseable, Iterator<Boolean>
```
public class DebugInputBitStream
extends InputBitStream
```
A debugging wrapper for input bit streams.
This class can be used to wrap an input bit stream. The semantics of the resulting read operations is unchanged, but each operation will be logged. The conventions are the same as those of DebugOutputBitStream, with the following additions:

!
reset();
+>
skip().

Since:

1.1

Author:

Sebastiano Vigna

Field Summary
- Fields inherited from class it.unimi.dsi.io.InputBitStream
  avail, buffer, DEFAULT_BUFFER_SIZE, DELTA, fileChannel, fill, GAMMA, is, pos, position, repositionableStream, SHIFTED_GAMMA, wrapping, ZETA_3

Constructor Summary

Constructors
Constructor	Description
`DebugInputBitStream(InputBitStream ibs)`	Creates a new debug input bit stream wrapping a given input bit stream and logging on standard error.
`DebugInputBitStream(InputBitStream ibs, PrintStream pw)`	Creates a new debug input bit stream wrapping a given input bit stream and logging on a given writer.

Method Summary

Modifier and Type	Method	Description
`void`	`align()`	Aligns the stream.
`long`	`available()`	Returns the number of bits that can be read (or skipped over) from this bit stream without blocking by the next caller of a method.
`void`	`close()`	Closes the bit stream.
`void`	`flush()`	Flushes the bit stream.
`void`	`position(long position)`	Sets this stream bit position, if it is based on a `RepositionableStream` or on a `FileChannel`.
`void`	`read(byte[] bits, int len)`	Reads a sequence of bits.
`int`	`readBit()`	Reads a bit.
`long`	`readBits()`	Returns the number of bits read from this bit stream.
`void`	`readBits(long readBits)`	Sets the number of bits read from this bit stream.
`int`	`readDelta()`	Reads a natural number in δ coding.
`int`	`readGamma()`	Reads a natural number in γ coding.
`int`	`readGolomb(int b)`	Reads a natural number in Golomb coding.
`int`	`readGolomb(int b, int log2b)`	Reads a natural number in Golomb coding.
`int`	`readInt(int len)`	Reads a fixed number of bits into an integer.
`long`	`readLong(int len)`	Reads a fixed number of bits into a long.
`long`	`readLongDelta()`	Reads a long natural number in δ coding.
`long`	`readLongGamma()`	Reads a long natural number in γ coding.
`long`	`readLongGolomb(long b)`	Reads a long natural number in Golomb coding.
`long`	`readLongGolomb(long b, int log2b)`	Reads a long natural number in Golomb coding.
`long`	`readLongMinimalBinary(long b)`	Reads a long natural number in a limited range using a minimal binary coding.
`long`	`readLongMinimalBinary(long b, int log2b)`	Reads a long natural number in a limited range using a minimal binary coding.
`long`	`readLongNibble()`	Reads a long natural number in variable-length nibble coding.
`long`	`readLongSkewedGolomb(long b)`	Reads a long natural number in skewed Golomb coding.
`long`	`readLongUnary()`	Reads a long natural number in unary coding.
`long`	`readLongZeta(int k)`	Reads a long natural number in ζ coding.
`int`	`readMinimalBinary(int b)`	Reads a natural number in a limited range using a minimal binary coding.
`int`	`readMinimalBinary(int b, int log2b)`	Reads a natural number in a limited range using a minimal binary coding.
`int`	`readNibble()`	Reads a natural number in variable-length nibble coding.
`int`	`readSkewedGolomb(int b)`	Reads a natural number in skewed Golomb coding.
`int`	`readUnary()`	Reads a natural number in unary coding.
`int`	`readZeta(int k)`	Reads a natural number in ζ coding.
`void`	`reset()`	Repositions this bit stream to the position at the time the `InputBitStream.mark(int)` method was last called.
`int`	`skip(int n)`	Deprecated.
`long`	`skip(long n)`	Skips the given number of bits.

Methods inherited from class it.unimi.dsi.io.InputBitStream
checkLength, copyTo, hasNext, mark, markSupported, nextBoolean, position, readDeltas, readGammas, readLongShiftedGamma, readShiftedGamma, readShiftedGammas, readZetas, skipDeltas, skipDeltas, skipGammas, skipGammas, skipShiftedGammas, skipShiftedGammas, skipZetas, skipZetas

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.booleans.BooleanIterator
forEachRemaining, forEachRemaining, next

Methods inherited from interface java.util.Iterator
remove

- Constructor Detail
  - DebugInputBitStream
```
public DebugInputBitStream(InputBitStream ibs,
                           PrintStream pw)
```
    Creates a new debug input bit stream wrapping a given input bit stream and logging on a given writer.
    
    Parameters:
    
    ibs - the input bit stream to wrap.
    
    pw - a print stream that will receive the logging data.
  - DebugInputBitStream
```
public DebugInputBitStream(InputBitStream ibs)
```
    Creates a new debug input bit stream wrapping a given input bit stream and logging on standard error.
    
    Parameters:
    
    ibs - the input bit stream to wrap.
- Method Detail
  - align
```
public void align()
```
    Description copied from class: InputBitStream
    
    Aligns the stream. After a call to this function, the stream is byte aligned. Bits that have been read to align are discarded.
    
    Overrides:
    
    align in class InputBitStream
  - available
```
public long available()
               throws IOException
```
    Description copied from class: InputBitStream
    
    Returns the number of bits that can be read (or skipped over) from this bit stream without blocking by the next caller of a method.
    
    Overrides:
    
    available in class InputBitStream
    
    Returns:
    
    the number of bits that can be read from this bit stream without blocking.
    
    Throws:
    
    IOException
  - close
```
public void close()
           throws IOException
```
    Description copied from class: InputBitStream
    
    Closes the bit stream. All resources associated with the stream are released.
    
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in interface Closeable
    
    Overrides:
    
    close in class InputBitStream
    
    Throws:
    
    IOException
  - flush
```
public void flush()
```
    Description copied from class: InputBitStream
    
    Flushes the bit stream. All state information associated with the stream is reset. This includes bytes prefetched from the stream, bits in the bit buffer and unget'd bits.
    This method is provided so that users of this class can easily wrap repositionable streams (for instance, file-based streams, which can be repositioned using the underlying FileChannel). It is guaranteed that after calling this method the underlying stream can be repositioned, and that the next read will draw data from the stream.
    
    Specified by:
    
    flush in interface Flushable
    
    Overrides:
    
    flush in class InputBitStream
  - position
```
public void position(long position)
              throws IOException
```
    Description copied from class: InputBitStream
    
    Sets this stream bit position, if it is based on a RepositionableStream or on a FileChannel.
    Given an underlying stream that implements RepositionableStream or that can provide a FileChannel via the getChannel() method, a call to this method has the same semantics of a InputBitStream.flush(), followed by a call to position(position / 8) on the byte stream, followed by a skip(position % 8).
    Note that this method does not change the value returned by InputBitStream.readBits().
    
    Overrides:
    
    position in class InputBitStream
    
    Parameters:
    
    position - the new position expressed as a bit offset.
    
    Throws:
    
    IOException
    
    See Also:
    
    FileChannel.position(long)
  - read
```
public void read(byte[] bits,
                 int len)
          throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a sequence of bits. Bits will be read in the natural way: the first bit is bit 7 of the first byte, the eightth bit is bit 0 of the first byte, the ninth bit is bit 7 of the second byte and so on.
    
    Overrides:
    
    read in class InputBitStream
    
    Parameters:
    
    bits - an array of bytes to store the result.
    
    len - the number of bits to read.
    
    Throws:
    
    IOException
  - readBit
```
public int readBit()
            throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a bit.
    
    Overrides:
    
    readBit in class InputBitStream
    
    Returns:
    
    the next bit from the stream.
    
    Throws:
    
    IOException
  - readBits
```
public long readBits()
```
    Description copied from class: InputBitStream
    
    Returns the number of bits read from this bit stream.
    
    Overrides:
    
    readBits in class InputBitStream
    
    Returns:
    
    the number of bits read so far.
  - readBits
```
public void readBits(long readBits)
```
    Description copied from class: InputBitStream
    
    Sets the number of bits read from this bit stream.
    This method is provided so that, for instance, the user can reset via readBits(0) the read-bits count after a InputBitStream.flush().
    
    Overrides:
    
    readBits in class InputBitStream
    
    Parameters:
    
    readBits - the new value for the number of bits read so far.
  - readDelta
```
public int readDelta()
              throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a natural number in δ coding.
    
    Overrides:
    
    readDelta in class InputBitStream
    
    Returns:
    
    the next δ-encoded natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeDelta(int), InputBitStream.skipDeltas(int)
  - readGamma
```
public int readGamma()
              throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a natural number in γ coding.
    
    Overrides:
    
    readGamma in class InputBitStream
    
    Returns:
    
    the next γ-encoded natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeGamma(int), InputBitStream.skipGammas(int)
  - readGolomb
```
public int readGolomb(int b,
                      int log2b)
               throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a natural number in Golomb coding. This method is faster than InputBitStream.readGolomb(int) because it does not have to compute log2b.
    This method implements also the case in which b is 0: in this case, nothing will be read, and 0 will be returned.
    
    Overrides:
    
    readGolomb in class InputBitStream
    
    Parameters:
    
    b - the modulus for the coding.
    
    log2b - the floor of the base-2 logarithm of the coding modulus.
    
    Returns:
    
    the next Golomb-encoded natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeGolomb(int, int)
  - readGolomb
```
public int readGolomb(int b)
               throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a natural number in Golomb coding.
    This method implements also the case in which b is 0: in this case, nothing will be read, and 0 will be returned.
    
    Overrides:
    
    readGolomb in class InputBitStream
    
    Parameters:
    
    b - the modulus for the coding.
    
    Returns:
    
    the next Golomb-encoded natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeGolomb(int, int)
  - readInt
```
public int readInt(int len)
            throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a fixed number of bits into an integer.
    
    Overrides:
    
    readInt in class InputBitStream
    
    Parameters:
    
    len - a bit length.
    
    Returns:
    
    an integer whose lower len bits are taken from the stream; the rest is zeroed.
    
    Throws:
    
    IOException
  - readLong
```
public long readLong(int len)
              throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a fixed number of bits into a long.
    
    Overrides:
    
    readLong in class InputBitStream
    
    Parameters:
    
    len - a bit length.
    
    Returns:
    
    a long whose lower len bits are taken from the stream; the rest is zeroed.
    
    Throws:
    
    IOException
  - readLongDelta
```
public long readLongDelta()
                   throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a long natural number in δ coding.
    
    Overrides:
    
    readLongDelta in class InputBitStream
    
    Returns:
    
    the next δ-encoded long natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeDelta(int), InputBitStream.skipDeltas(int)
  - readLongGamma
```
public long readLongGamma()
                   throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a long natural number in γ coding.
    
    Overrides:
    
    readLongGamma in class InputBitStream
    
    Returns:
    
    the next γ-encoded long natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeGamma(int), InputBitStream.skipGammas(int)
  - readLongGolomb
```
public long readLongGolomb(long b,
                           int log2b)
                    throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a long natural number in Golomb coding. This method is faster than InputBitStream.readLongGolomb(long) because it does not have to compute log2b.
    This method implements also the case in which b is 0: in this case, nothing will be read, and 0 will be returned.
    
    Overrides:
    
    readLongGolomb in class InputBitStream
    
    Parameters:
    
    b - the modulus for the coding.
    
    log2b - the floor of the base-2 logarithm of the coding modulus.
    
    Returns:
    
    the next Golomb-encoded long natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeGolomb(int, int)
  - readLongGolomb
```
public long readLongGolomb(long b)
                    throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a long natural number in Golomb coding.
    This method implements also the case in which b is 0: in this case, nothing will be read, and 0 will be returned.
    
    Overrides:
    
    readLongGolomb in class InputBitStream
    
    Parameters:
    
    b - the modulus for the coding.
    
    Returns:
    
    the next Golomb-encoded long natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeGolomb(int, int)
  - readLongMinimalBinary
```
public long readLongMinimalBinary(long b,
                                  int log2b)
                           throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a long natural number in a limited range using a minimal binary coding. This method is faster than InputBitStream.readLongMinimalBinary(long) because it does not have to compute log2b.
    
    Overrides:
    
    readLongMinimalBinary in class InputBitStream
    
    Parameters:
    
    b - a strict upper bound.
    
    log2b - the floor of the base-2 logarithm of the bound.
    
    Returns:
    
    the next minimally binary encoded long natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeMinimalBinary(int, int)
  - readLongMinimalBinary
```
public long readLongMinimalBinary(long b)
                           throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a long natural number in a limited range using a minimal binary coding.
    
    Overrides:
    
    readLongMinimalBinary in class InputBitStream
    
    Parameters:
    
    b - a strict upper bound.
    
    Returns:
    
    the next minimally binary encoded long natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeMinimalBinary(int, int)
  - readLongNibble
```
public long readLongNibble()
                    throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a long natural number in variable-length nibble coding.
    
    Overrides:
    
    readLongNibble in class InputBitStream
    
    Returns:
    
    the next variable-length nibble-encoded long natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeNibble(int)
  - readLongSkewedGolomb
```
public long readLongSkewedGolomb(long b)
                          throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a long natural number in skewed Golomb coding.
    This method implements also the case in which b is 0: in this case, nothing will be read, and 0 will be returned.
    
    Overrides:
    
    readLongSkewedGolomb in class InputBitStream
    
    Parameters:
    
    b - the modulus for the coding.
    
    Returns:
    
    the next skewed Golomb-encoded long natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeSkewedGolomb(int, int)
  - readLongUnary
```
public long readLongUnary()
                   throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a long natural number in unary coding. Note that by unary coding we mean that 1 encodes 0, 01 encodes 1 and so on.
    
    Overrides:
    
    readLongUnary in class InputBitStream
    
    Returns:
    
    the next unary-encoded long natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeUnary(int)
  - readLongZeta
```
public long readLongZeta(int k)
                  throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a long natural number in ζ coding.
    
    Overrides:
    
    readLongZeta in class InputBitStream
    
    Parameters:
    
    k - the shrinking factor.
    
    Returns:
    
    the next ζ-encoded long natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeZeta(int, int)
  - readMinimalBinary
```
public int readMinimalBinary(int b,
                             int log2b)
                      throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a natural number in a limited range using a minimal binary coding. This method is faster than InputBitStream.readMinimalBinary(int) because it does not have to compute log2b.
    
    Overrides:
    
    readMinimalBinary in class InputBitStream
    
    Parameters:
    
    b - a strict upper bound.
    
    log2b - the floor of the base-2 logarithm of the bound.
    
    Returns:
    
    the next minimally binary encoded natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeMinimalBinary(int, int)
  - readMinimalBinary
```
public int readMinimalBinary(int b)
                      throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a natural number in a limited range using a minimal binary coding.
    
    Overrides:
    
    readMinimalBinary in class InputBitStream
    
    Parameters:
    
    b - a strict upper bound.
    
    Returns:
    
    the next minimally binary encoded natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeMinimalBinary(int, int)
  - readNibble
```
public int readNibble()
               throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a natural number in variable-length nibble coding.
    
    Overrides:
    
    readNibble in class InputBitStream
    
    Returns:
    
    the next variable-length nibble-encoded natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeNibble(int)
  - readSkewedGolomb
```
public int readSkewedGolomb(int b)
                     throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a natural number in skewed Golomb coding.
    This method implements also the case in which b is 0: in this case, nothing will be read, and 0 will be returned.
    
    Overrides:
    
    readSkewedGolomb in class InputBitStream
    
    Parameters:
    
    b - the modulus for the coding.
    
    Returns:
    
    the next skewed Golomb-encoded natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeSkewedGolomb(int, int)
  - readUnary
```
public int readUnary()
              throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a natural number in unary coding.
    
    Overrides:
    
    readUnary in class InputBitStream
    
    Returns:
    
    the next unary-encoded natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeUnary(int)
  - readZeta
```
public int readZeta(int k)
             throws IOException
```
    Description copied from class: InputBitStream
    
    Reads a natural number in ζ coding.
    
    Overrides:
    
    readZeta in class InputBitStream
    
    Parameters:
    
    k - the shrinking factor.
    
    Returns:
    
    the next ζ-encoded natural number.
    
    Throws:
    
    IOException
    
    See Also:
    
    OutputBitStream.writeZeta(int, int)
  - reset
```
public void reset()
           throws IOException
```
    Description copied from class: InputBitStream
    
    Repositions this bit stream to the position at the time the InputBitStream.mark(int) method was last called.
    This method will just flush the stream and delegate the reset to the underlying InputStream.
    
    Overrides:
    
    reset in class InputBitStream
    
    Throws:
    
    IOException
  - skip
```
@Deprecated
public int skip(int n)
```
    Deprecated.
    
    Description copied from class: InputBitStream
    
    Skips over the given number of bits.
    
    Specified by:
    
    skip in interface BooleanIterator
    
    Overrides:
    
    skip in class InputBitStream
    
    Parameters:
    
    n - the number of bits to skip.
    
    Returns:
    
    the number of bits actually skipped.
  - skip
```
public long skip(long n)
          throws IOException
```
    Description copied from class: InputBitStream
    
    Skips the given number of bits.
    
    Overrides:
    
    skip in class InputBitStream
    
    Parameters:
    
    n - the number of bits to skip.
    
    Returns:
    
    the actual number of skipped bits.
    
    Throws:
    
    IOException

Class DebugInputBitStream

Field Summary

Fields inherited from class it.unimi.dsi.io.InputBitStream

Constructor Summary

Method Summary

Methods inherited from class it.unimi.dsi.io.InputBitStream

Methods inherited from class java.lang.Object

Methods inherited from interface it.unimi.dsi.fastutil.booleans.BooleanIterator

Methods inherited from interface java.util.Iterator

Constructor Detail

DebugInputBitStream

DebugInputBitStream

Method Detail

align

available

close

flush

position

read

readBit

readBits

readBits

readDelta

readGamma

readGolomb

readGolomb

readInt

readLong

readLongDelta

readLongGamma

readLongGolomb

readLongGolomb

readLongMinimalBinary

readLongMinimalBinary

readLongNibble

readLongSkewedGolomb

readLongUnary

readLongZeta

readMinimalBinary

readMinimalBinary

readNibble

readSkewedGolomb

readUnary

readZeta

reset

skip

skip