Package com.pixelmed.scpecg
Class HuffmanDecoder
- java.lang.Object
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- com.pixelmed.scpecg.HuffmanDecoder
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public class HuffmanDecoder extends java.lang.Object
A class to implement Huffman decoding as used by the SCP-ECG standard.
- See Also:
DefaultHuffmanTable
,HuffmanTable
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Constructor Summary
Constructors Constructor Description HuffmanDecoder(byte[] bytesToDecompress, int differenceDataUsed, int multiplier, int numberOfHuffmanTables, java.util.ArrayList huffmanTablesList)
Construct a Huffman decoder for the supplied encoded data, as read from an SCP-ECG file.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description short
decode()
Decode a single value.short[]
decode(int nValuesWanted)
Decode a specified number of values.static void
main(java.lang.String[] arg)
For testing.java.lang.String
toString()
Dump the current decoder state as aString
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Constructor Detail
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HuffmanDecoder
public HuffmanDecoder(byte[] bytesToDecompress, int differenceDataUsed, int multiplier, int numberOfHuffmanTables, java.util.ArrayList huffmanTablesList)
Construct a Huffman decoder for the supplied encoded data, as read from an SCP-ECG file.
- Parameters:
bytesToDecompress
- the compressed datadifferenceDataUsed
- 0 = no, 1 = 1 difference value, 2 = 2 difference valuesmultiplier
- a value by which to scale the decoded valuesnumberOfHuffmanTables
- how many tables are available for usehuffmanTablesList
- the Huffman tables themselves
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Method Detail
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decode
public final short decode() throws java.lang.Exception
Decode a single value.
- Returns:
- the decoded value
- Throws:
java.lang.Exception
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decode
public final short[] decode(int nValuesWanted) throws java.lang.Exception
Decode a specified number of values.
- Parameters:
nValuesWanted
- the number of decoded values wanted- Returns:
- the decoded values
- Throws:
java.lang.Exception
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toString
public java.lang.String toString()
Dump the current decoder state as a
String
.- Overrides:
toString
in classjava.lang.Object
- Returns:
- the current decoder state as a
String
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main
public static void main(java.lang.String[] arg)
For testing.
Decodes the byte stream in the example specified in the SCP-ECG standard.
- Parameters:
arg
- none
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