org.apache.tika.parser.chm.core
Class ChmCommons

java.lang.Object
  org.apache.tika.parser.chm.core.ChmCommons

public class ChmCommons
extends Object

Nested Class Summary

static class	ChmCommons.EntryType Represents entry types: uncompressed, compressed
static class	ChmCommons.IntelState Represents intel file states during decompression
static class	ChmCommons.LzxState Represents lzx states: started decoding, not started decoding

Field Summary

static int	ALIGNED_OFFSET
static int	UNCOMPRESSED
static int	UNDEFINED Represents lzx block types in order to decompress differently
static int	VERBATIM

Method Summary

static void	assertByteArrayNotNull(byte[] data)
static byte[]	copyOfRange(byte[] original, int from, int to)
static byte[]	getChmBlockSegment(byte[] data, ChmLzxcResetTable resetTable, int blockNumber, int lzxcBlockOffset, int lzxcBlockLength)
static String	getLanguage(long langID) Returns textual representation of LangID
static int	getWindowSize(int window) LZX supports window sizes of 2^15 (32Kb) through 2^21 (2Mb) Returns X, i.e 2^X
static boolean	hasSkip(DirectoryListingEntry directoryListingEntry) Checks skippable patterns
static int	indexOf(byte[] text, byte[] pattern) Searches some pattern in byte[]
static int	indexOf(List<DirectoryListingEntry> list, String pattern) Searches for some pattern in the directory listing entry list
static int	indexOfResetTableBlock(byte[] text, byte[] pattern) Returns an index of the reset table
static boolean	isEmpty(String str)
static void	main(String[] args)
static void	reverse(byte[] array) Reverses the order of given array
static void	writeFile(byte[][] buffer, String fileToBeSaved) Writes byte[][] to the file

Methods inherited from class java.lang.Object

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

Field Detail

UNDEFINED

public static final int UNDEFINED

Represents lzx block types in order to decompress differently

See Also:

Constant Field Values

VERBATIM

public static final int VERBATIM

See Also:

Constant Field Values

ALIGNED_OFFSET

public static final int ALIGNED_OFFSET

See Also:

Constant Field Values

UNCOMPRESSED

public static final int UNCOMPRESSED

See Also:

Constant Field Values

Method Detail

assertByteArrayNotNull

public static void assertByteArrayNotNull(byte[] data)
                                   throws TikaException

Throws:

TikaException

getWindowSize

public static int getWindowSize(int window)

LZX supports window sizes of 2^15 (32Kb) through 2^21 (2Mb) Returns X, i.e 2^X

Parameters:

window - chmLzxControlData.getWindowSize()

Returns:

window size

getChmBlockSegment

public static byte[] getChmBlockSegment(byte[] data,
                                        ChmLzxcResetTable resetTable,
                                        int blockNumber,
                                        int lzxcBlockOffset,
                                        int lzxcBlockLength)
                                 throws TikaException

Throws:

TikaException

getLanguage

public static String getLanguage(long langID)

Returns textual representation of LangID

Parameters:

langID -

Returns:

language name

hasSkip

public static boolean hasSkip(DirectoryListingEntry directoryListingEntry)

Checks skippable patterns

Parameters:

directoryListingEntry -

Returns:

boolean

writeFile

public static void writeFile(byte[][] buffer,
                             String fileToBeSaved)
                      throws TikaException

Writes byte[][] to the file

Parameters:

buffer -

fileToBeSaved - file name

Throws:

TikaException

reverse

public static void reverse(byte[] array)

Reverses the order of given array

Parameters:

array -

indexOfResetTableBlock

public static final int indexOfResetTableBlock(byte[] text,
                                               byte[] pattern)
                                        throws ChmParsingException

Returns an index of the reset table

Parameters:

text -

pattern -

Returns:

index of the reset table

Throws:

ChmParsingException

indexOf

public static int indexOf(byte[] text,
                          byte[] pattern)
                   throws ChmParsingException

Searches some pattern in byte[]

Parameters:

text - byte[]

pattern - byte[]

Returns:

an index, if nothing found returns -1

Throws:

ChmParsingException

indexOf

public static int indexOf(List<DirectoryListingEntry> list,
                          String pattern)

Searches for some pattern in the directory listing entry list

Parameters:

list -

pattern -

Returns:

an index, if nothing found returns -1

copyOfRange

public static byte[] copyOfRange(byte[] original,
                                 int from,
                                 int to)

isEmpty

public static boolean isEmpty(String str)

main

public static void main(String[] args)

Parameters:

args -