--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/Java/SevenZip/Compression/RangeCoder/Decoder.java Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,88 @@
+package SevenZip.Compression.RangeCoder;
+import java.io.IOException;
+
+public class Decoder
+{
+ static final int kTopMask = ~((1 << 24) - 1);
+
+ static final int kNumBitModelTotalBits = 11;
+ static final int kBitModelTotal = (1 << kNumBitModelTotalBits);
+ static final int kNumMoveBits = 5;
+
+ int Range;
+ int Code;
+
+ java.io.InputStream Stream;
+
+ public final void SetStream(java.io.InputStream stream)
+ {
+ Stream = stream;
+ }
+
+ public final void ReleaseStream()
+ {
+ Stream = null;
+ }
+
+ public final void Init() throws IOException
+ {
+ Code = 0;
+ Range = -1;
+ for (int i = 0; i < 5; i++)
+ Code = (Code << 8) | Stream.read();
+ }
+
+ public final int DecodeDirectBits(int numTotalBits) throws IOException
+ {
+ int result = 0;
+ for (int i = numTotalBits; i != 0; i--)
+ {
+ Range >>>= 1;
+ int t = ((Code - Range) >>> 31);
+ Code -= Range & (t - 1);
+ result = (result << 1) | (1 - t);
+
+ if ((Range & kTopMask) == 0)
+ {
+ Code = (Code << 8) | Stream.read();
+ Range <<= 8;
+ }
+ }
+ return result;
+ }
+
+ public int DecodeBit(short []probs, int index) throws IOException
+ {
+ int prob = probs[index];
+ int newBound = (Range >>> kNumBitModelTotalBits) * prob;
+ if ((Code ^ 0x80000000) < (newBound ^ 0x80000000))
+ {
+ Range = newBound;
+ probs[index] = (short)(prob + ((kBitModelTotal - prob) >>> kNumMoveBits));
+ if ((Range & kTopMask) == 0)
+ {
+ Code = (Code << 8) | Stream.read();
+ Range <<= 8;
+ }
+ return 0;
+ }
+ else
+ {
+ Range -= newBound;
+ Code -= newBound;
+ probs[index] = (short)(prob - ((prob) >>> kNumMoveBits));
+ if ((Range & kTopMask) == 0)
+ {
+ Code = (Code << 8) | Stream.read();
+ Range <<= 8;
+ }
+ return 1;
+ }
+ }
+
+ public static void InitBitModels(short []probs)
+ {
+ for (int i = 0; i < probs.length; i++)
+ probs[i] = (kBitModelTotal >>> 1);
+ }
+}