CanonicalFast64CodeWordDecoder (dsiutil 2.6.0)

java.lang.Object
- it.unimi.dsi.compression.CanonicalFast64CodeWordDecoder

All Implemented Interfaces:

Decoder, Serializable
```
public final class CanonicalFast64CodeWordDecoder
extends Object
implements Decoder, Serializable
```
A fast table-based decoder for canonical Huffman codes supporting only codes with limited (less than 64 bits) codewords. We use the technique described by Daniel S. Hirschberg and Debra A. Lelewer, “Efficient Decoding of Prefix Codes”, Comm. ACM, 33(4): 449−459, 1990.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor	Description
`CanonicalFast64CodeWordDecoder(int[] codeWordLength, int[] symbol)`	Creates a new codeword-based decoder using the given vector of codewords lengths and a symbol array.

Method Summary

Modifier and Type	Method	Description
`int`	`decode(BooleanIterator iterator)`	Decodes the next symbol from the given boolean iterator.
`int`	`decode(InputBitStream ibs)`	Decodes the next symbol from the given input bit stream.

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

- Constructor Detail
  - CanonicalFast64CodeWordDecoder
```
public CanonicalFast64CodeWordDecoder(int[] codeWordLength,
                                      int[] symbol)
```
    Creates a new codeword-based decoder using the given vector of codewords lengths and a symbol array.
    
    Parameters:
    
    codeWordLength - a vector of nondecreasing codeword lengths suitable for a canonical code.
    
    symbol - a parallel array of symbols corresponding to each codeword length.
- Method Detail
  - decode
```
public int decode(BooleanIterator iterator)
```
    Description copied from interface: Decoder
    
    Decodes the next symbol from the given boolean iterator.
    Note that InputBitStream implements BooleanIterator.
    
    Specified by:
    
    decode in interface Decoder
    
    Parameters:
    
    iterator - a boolean iterator.
    
    Returns:
    
    the next symbol decoded from the bits emitted by i
  - decode
```
public int decode(InputBitStream ibs)
           throws IOException
```
    Description copied from interface: Decoder
    
    Decodes the next symbol from the given input bit stream.
    Note that InputBitStream implements BooleanIterator.
    
    Specified by:
    
    decode in interface Decoder
    
    Parameters:
    
    ibs - an input bit stream.
    
    Returns:
    
    the next symbol decoded from ibs.
    
    Throws:
    
    IOException