org.apache.tika.parser.chm.accessor

Class ChmPmglHeader

java.lang.Object

org.apache.tika.parser.chm.accessor.ChmPmglHeader

All Implemented Interfaces:

java.io.Serializable, ChmAccessor<ChmPmglHeader>

public class ChmPmglHeader
extends java.lang.Object
implements ChmAccessor<ChmPmglHeader>

Description There are two types of directory chunks -- index chunks, and listing chunks. The index chunk will be omitted if there is only one listing chunk. A listing chunk has the following format: 0000: char[4] 'PMGL' 0004: DWORD Length of free space and/or quickref area at end of directory chunk 0008: DWORD Always 0 000C: DWORD Chunk number of previous listing chunk when reading directory in sequence (-1 if this is the first listing chunk) 0010: DWORD Chunk number of next listing chunk when reading directory in sequence (-1 if this is the last listing chunk) 0014: Directory listing entries (to quickref area) Sorted by filename; the sort is case-insensitive The quickref area is written backwards from the end of the chunk. One quickref entry exists for every n entries in the file, where n is calculated as 1 + (1 << quickref density). So for density = 2, n = 5 Chunklen-0002: WORD Number of entries in the chunk Chunklen-0004: WORD Offset of entry n from entry 0 Chunklen-0008: WORD Offset of entry 2n from entry 0 Chunklen-000C: WORD Offset of entry 3n from entry 0 ... The format of a directory listing entry is as follows BYTE: length of name BYTEs: name (UTF-8 encoded) ENCINT: content section ENCINT: offset ENCINT: length The offset is from the beginning of the content section the file is in, after the section has been decompressed (if appropriate). The length also refers to length of the file in the section after decompression. There are two kinds of file represented in the directory: user data and format related files. The files which are format-related have names which begin with '::', the user data files have names which begin with "/".

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ChmPmglHeader()

Method Summary

Modifier and Type	Method and Description
int	getBlockNext()
int	getBlockPrev()
long	getFreeSpace()
byte[]	getSignature()
long	getUnknown0008()
void	parse(byte[] data, ChmPmglHeader chmPmglHeader) Parses chm accessor
void	setFreeSpace(long free_space)
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ChmPmglHeader

public ChmPmglHeader()

Method Detail

getFreeSpace

public long getFreeSpace()

setFreeSpace

public void setFreeSpace(long free_space)
                  throws TikaException

Throws:

TikaException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

parse

public void parse(byte[] data,
                  ChmPmglHeader chmPmglHeader)
           throws TikaException

Description copied from interface: ChmAccessor

Parses chm accessor

Specified by:

parse in interface ChmAccessor<ChmPmglHeader>

Parameters:

data - chm file

Throws:

TikaException

getSignature

public byte[] getSignature()

getUnknown0008

public long getUnknown0008()

getBlockPrev

public int getBlockPrev()

getBlockNext

public int getBlockNext()