Package com.aowagie.text.pdf
Class LZWDecoder
java.lang.Object
com.aowagie.text.pdf.LZWDecoder
A class for performing LZW decoding.
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate final int[]
private int
private int
private int
private byte[]
private int
private int
private byte[][]
private int
private OutputStream
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprivate void
addStringToTable
(byte[] string) Add a new string to the string table.private void
addStringToTable
(byte[] oldString, byte newString) Add a new string to the string table.private byte[]
composeString
(byte[] oldString, byte newString) AppendnewString
to the end ofoldString
.void
decode
(byte[] data, OutputStream uncompData) Method to decode LZW compressed data.int
private void
Initialize the string table.private void
writeString
(byte[] string) Write out the string just uncompressed.
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Field Details
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stringTable
private byte[][] stringTable -
data
private byte[] data -
uncompData
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tableIndex
private int tableIndex -
bitsToGet
private int bitsToGet -
bytePointer
private int bytePointer -
bitPointer
private int bitPointer -
nextData
private int nextData -
nextBits
private int nextBits -
andTable
private final int[] andTable
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Constructor Details
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LZWDecoder
public LZWDecoder()
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Method Details
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decode
Method to decode LZW compressed data.- Parameters:
data
- The compressed data.uncompData
- Array to return the uncompressed data in.
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initializeStringTable
private void initializeStringTable()Initialize the string table. -
writeString
private void writeString(byte[] string) Write out the string just uncompressed. -
addStringToTable
private void addStringToTable(byte[] oldString, byte newString) Add a new string to the string table. -
addStringToTable
private void addStringToTable(byte[] string) Add a new string to the string table. -
composeString
private byte[] composeString(byte[] oldString, byte newString) AppendnewString
to the end ofoldString
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getNextCode
public int getNextCode()
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