iText.Kernel.Pdf.Filters.LZWDecoder Class Reference

A class for performing LZW decoding. More...

Public Member Functions
	LZWDecoder ()
	Creates an LZWDecoder instance. More...
virtual void	Decode (byte[] data, Stream uncompData)
	Method to decode LZW compressed data. More...
virtual void	InitializeStringTable ()
	Initialize the string table. More...
virtual void	WriteString (byte[] @string)
	Write out the string just uncompressed. More...
virtual void	AddStringToTable (byte[] oldString, byte newString)
	Add a new string to the string table. More...
virtual void	AddStringToTable (byte[] @string)
	Add a new string to the string table. More...
virtual byte[]	ComposeString (byte[] oldString, byte newString)
	Append newString to the end of oldString. More...
virtual int	GetNextCode ()
	Attempt to get the next code. More...

Detailed Description

A class for performing LZW decoding.

Constructor & Destructor Documentation

LZWDecoder()

iText.Kernel.Pdf.Filters.LZWDecoder.LZWDecoder ( )

inline

Creates an LZWDecoder instance.

Member Function Documentation

AddStringToTable() [1/2]

virtual void iText.Kernel.Pdf.Filters.LZWDecoder.AddStringToTable ( byte @[]  string )

inlinevirtual

Add a new string to the string table.

Parameters

string

byte[] to store in the string table

AddStringToTable() [2/2]

virtual void iText.Kernel.Pdf.Filters.LZWDecoder.AddStringToTable ( byte[]  oldString, byte  newString  )

inlinevirtual

Add a new string to the string table.

Parameters

oldString	stored string
newString	string to be appended to the stored string

ComposeString()

virtual byte [] iText.Kernel.Pdf.Filters.LZWDecoder.ComposeString ( byte[]  oldString, byte  newString  )

inlinevirtual

Append newString to the end of oldString.

Parameters

oldString	string be appended to
newString	string that is to be appended to oldString

Returns

combined string

Decode()

virtual void iText.Kernel.Pdf.Filters.LZWDecoder.Decode ( byte[]  data, Stream  uncompData  )

inlinevirtual

Method to decode LZW compressed data.

Parameters

data	The compressed data.
uncompData	Array to return the uncompressed data in.

GetNextCode()

virtual int iText.Kernel.Pdf.Filters.LZWDecoder.GetNextCode ( )

inlinevirtual

Attempt to get the next code.

Attempt to get the next code. Exceptions are caught to make this robust to cases wherein the EndOfInformation code has been omitted from a strip. Examples of such cases have been observed in practice.

Returns

next code

InitializeStringTable()

virtual void iText.Kernel.Pdf.Filters.LZWDecoder.InitializeStringTable ( )

inlinevirtual

Initialize the string table.

WriteString()

virtual void iText.Kernel.Pdf.Filters.LZWDecoder.WriteString ( byte @[]  string )

inlinevirtual

Write out the string just uncompressed.

Parameters

string

content to write to the uncompressed data