org.apache.commons.compress.archivers.zip

Class UnshrinkingInputStream

java.lang.Object

java.io.InputStream

org.apache.commons.compress.compressors.CompressorInputStream

org.apache.commons.compress.compressors.lzw.LZWInputStream

org.apache.commons.compress.archivers.zip.UnshrinkingInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, InputStreamStatistics

class UnshrinkingInputStream
extends LZWInputStream

Input stream that decompresses ZIP method 1 (unshrinking). A variation of the LZW algorithm, with some twists.

Since:

1.7

Field Summary

Fields

Modifier and Type	Field and Description
private boolean[]	isUsed
private static int	MAX_CODE_SIZE
private static int	MAX_TABLE_SIZE

Fields inherited from class org.apache.commons.compress.compressors.lzw.LZWInputStream

DEFAULT_CODE_SIZE, in, UNUSED_PREFIX

Constructor Summary

Constructors

Constructor and Description
UnshrinkingInputStream(java.io.InputStream inputStream) IOException is not actually thrown!

Method Summary

Modifier and Type	Method and Description
protected int	addEntry(int previousCode, byte character) Add a new entry to the dictionary.
protected int	decompressNextSymbol() Read the next code and expand it.
private void	partialClear()

Methods inherited from class org.apache.commons.compress.compressors.lzw.LZWInputStream

addEntry, addRepeatOfPreviousCode, close, expandCodeToOutputStack, getClearCode, getCodeSize, getCompressedCount, getPrefix, getPrefixesLength, getTableSize, incrementCodeSize, initializeTables, initializeTables, read, read, readNextCode, resetCodeSize, resetPreviousCode, setClearCode, setCodeSize, setPrefix, setTableSize

Methods inherited from class org.apache.commons.compress.compressors.CompressorInputStream

count, count, getBytesRead, getCount, getUncompressedCount, pushedBackBytes

Methods inherited from class java.io.InputStream

available, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.compress.utils.InputStreamStatistics

getUncompressedCount

Field Detail

MAX_CODE_SIZE

private static final int MAX_CODE_SIZE

See Also:

Constant Field Values

MAX_TABLE_SIZE

private static final int MAX_TABLE_SIZE

See Also:

Constant Field Values

isUsed

private final boolean[] isUsed

Constructor Detail

UnshrinkingInputStream

public UnshrinkingInputStream(java.io.InputStream inputStream)
                       throws java.io.IOException

IOException is not actually thrown!

Parameters:

inputStream -

Throws:

java.io.IOException - IOException is not actually thrown!

Method Detail

addEntry

protected int addEntry(int previousCode,
                       byte character)
                throws java.io.IOException

Description copied from class: LZWInputStream

Add a new entry to the dictionary.

Specified by:

addEntry in class LZWInputStream

Parameters:

previousCode - the previous code

character - the next character to append

Returns:

the new code

Throws:

java.io.IOException - on error

partialClear

private void partialClear()

decompressNextSymbol

protected int decompressNextSymbol()
                            throws java.io.IOException

Description copied from class: LZWInputStream

Read the next code and expand it.

Specified by:

decompressNextSymbol in class LZWInputStream

Returns:

the expanded next code

Throws:

java.io.IOException - on error