程序包 com.github.myibu.algorithm.compress

类 LZWCompressor

java.lang.Object

com.github.myibu.algorithm.compress.LZWCompressor

所有已实现的接口:

Compressor, Debugable

public class LZWCompressor
extends java.lang.Object
implements Compressor

LZW compress algorithm

构造器概要

构造器

构造器	说明
LZWCompressor()

方法概要

修饰符和类型	方法	说明
int	compress(byte[] in_data, int in_len, byte[] out_data)	s = empty string; while (there is still data to be read) { ch = read a character; if (dictionary contains s+ch) { s = s+ch; } else { encode s to output file; add s+ch to dictionary; s = ch; } } encode s to output file;
int	decompress(byte[] in_data, int in_len, byte[] out_data)	prevcode = read in a code; decode/output prevcode; while (there is still data to read) { currcode = read in a code; entry = translation of currcode from dictionary; output entry; ch = first char of entry; add ((translation of prevcode)+ch) to dictionary; prevcode = currcode; }
void	setDebug(boolean isDebug)	enable Debug or not， default should be not enabled

从类继承的方法 java.lang.Object

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

构造器详细资料

LZWCompressor

public LZWCompressor()

方法详细资料

compress

public int compress(byte[] in_data,
                    int in_len,
                    byte[] out_data)

s = empty string; while (there is still data to be read) { ch = read a character; if (dictionary contains s+ch) { s = s+ch; } else { encode s to output file; add s+ch to dictionary; s = ch; } } encode s to output file;

指定者:

compress 在接口中 Compressor

参数:

in_data - input

in_len - length of input

out_data - output

返回:

offset in output

decompress

public int decompress(byte[] in_data,
                      int in_len,
                      byte[] out_data)

prevcode = read in a code; decode/output prevcode; while (there is still data to read) { currcode = read in a code; entry = translation of currcode from dictionary; output entry; ch = first char of entry; add ((translation of prevcode)+ch) to dictionary; prevcode = currcode; }

指定者:

decompress 在接口中 Compressor

参数:

in_data - input

in_len - length of input

out_data - output

返回:

offset in output

setDebug

public void setDebug(boolean isDebug)

从接口复制的说明: Debugable

enable Debug or not， default should be not enabled

指定者:

setDebug 在接口中 Debugable

参数:

isDebug - is debug