Package org.apache.tika.parser.microsoft.chm

Class ChmCommons

java.lang.Object

org.apache.tika.parser.microsoft.chm.ChmCommons

public class ChmCommons
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	ChmCommons.EntryType	Represents entry types: uncompressed, compressed
static enum	ChmCommons.IntelState	Represents intel file states during decompression
static enum	ChmCommons.LzxState	Represents lzx states: started decoding, not started decoding

Field Summary

Fields

Modifier and Type	Field	Description
static final int	ALIGNED_OFFSET
static final int	UNCOMPRESSED
static final int	UNDEFINED	Represents lzx block types in order to decompress differently
static final int	VERBATIM

Method Summary

Modifier and Type	Method	Description
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	indexOfDataSpaceStorageElement(byte[] text, byte[] pattern)	Searches some pattern in byte[]
static int	indexOfDataSpaceStorageElement(List<DirectoryListingEntry> list, String pattern)	Searches for some pattern in the directory listing entry list This requires that the entry name start with "::DataSpaceStorage" See TIKA-4204
static final int	indexOfResetTableBlock(byte[] text, byte[] pattern)	Returns an index of the reset table
static boolean	isEmpty(String str)
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 Details

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 Details

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

indexOfDataSpaceStorageElement

public static int indexOfDataSpaceStorageElement(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

indexOfDataSpaceStorageElement

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

Searches for some pattern in the directory listing entry list This requires that the entry name start with "::DataSpaceStorage" See TIKA-4204

Parameters:

list -

pattern -

Returns:

an index, if nothing found returns -1

copyOfRange

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

Throws:

TikaException

isEmpty

public static boolean isEmpty(String str)