misc/libphysfs/lzma/Java/SevenZip/Compression/RangeCoder/Decoder.java
author Wuzzy <almikes@aol.com>
Sat, 15 Apr 2017 23:21:13 +0200
changeset 12265 0641da8c22ee
parent 12218 bb5522e88ab2
permissions -rw-r--r--
Add two main menu tips regarding mission panel
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package SevenZip.Compression.RangeCoder;
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import java.io.IOException;
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public class Decoder
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{
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	static final int kTopMask = ~((1 << 24) - 1);
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	static final int kNumBitModelTotalBits = 11;
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	static final int kBitModelTotal = (1 << kNumBitModelTotalBits);
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	static final int kNumMoveBits = 5;
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	int Range;
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	int Code;
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	java.io.InputStream Stream;
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	public final void SetStream(java.io.InputStream stream)
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	{ 
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		Stream = stream; 
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	}
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	public final void ReleaseStream()
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	{ 
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		Stream = null; 
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	}
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	public final void Init() throws IOException
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	{
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		Code = 0;
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		Range = -1;
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		for (int i = 0; i < 5; i++)
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			Code = (Code << 8) | Stream.read();
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	}
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	public final int DecodeDirectBits(int numTotalBits) throws IOException
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	{
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		int result = 0;
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		for (int i = numTotalBits; i != 0; i--)
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		{
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			Range >>>= 1;
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			int t = ((Code - Range) >>> 31);
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			Code -= Range & (t - 1);
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			result = (result << 1) | (1 - t);
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			if ((Range & kTopMask) == 0)
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			{
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				Code = (Code << 8) | Stream.read();
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				Range <<= 8;
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			}
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		}
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		return result;
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	}
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	public int DecodeBit(short []probs, int index) throws IOException
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	{
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		int prob = probs[index];
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		int newBound = (Range >>> kNumBitModelTotalBits) * prob;
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		if ((Code ^ 0x80000000) < (newBound ^ 0x80000000))
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		{
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			Range = newBound;
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			probs[index] = (short)(prob + ((kBitModelTotal - prob) >>> kNumMoveBits));
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			if ((Range & kTopMask) == 0)
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			{
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				Code = (Code << 8) | Stream.read();
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				Range <<= 8;
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			}
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			return 0;
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		}
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		else
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		{
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			Range -= newBound;
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			Code -= newBound;
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			probs[index] = (short)(prob - ((prob) >>> kNumMoveBits));
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			if ((Range & kTopMask) == 0)
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			{
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				Code = (Code << 8) | Stream.read();
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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    77
				Range <<= 8;
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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    78
			}
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    79
			return 1;
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
parents:
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    80
		}
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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    81
	}
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
parents:
diff changeset
    82
	
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    83
	public static void InitBitModels(short []probs)
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    84
	{
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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    85
		for (int i = 0; i < probs.length; i++)
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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    86
			probs[i] = (kBitModelTotal >>> 1);
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
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    87
	}
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
nemo
parents:
diff changeset
    88
}