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| author | wolfbeast <mcwerewolf@wolfbeast.com> | 2019-03-29 16:04:01 +0100 |
|---|---|---|
| committer | wolfbeast <mcwerewolf@wolfbeast.com> | 2019-03-29 16:04:01 +0100 |
| commit | 88083f8c683c18f4de68a20c863a82a9da65db8f (patch) | |
| tree | 926656892d9d80260da02ea8ea71031b140c51df /other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/BitTreeDecoder.java | |
| parent | f999f544aad04069b03704d994a99352263f600b (diff) | |
| parent | 843e4ceffd6ce21a6e6db37419335eafdc543e18 (diff) | |
| download | UXP-88083f8c683c18f4de68a20c863a82a9da65db8f.tar UXP-88083f8c683c18f4de68a20c863a82a9da65db8f.tar.gz UXP-88083f8c683c18f4de68a20c863a82a9da65db8f.tar.lz UXP-88083f8c683c18f4de68a20c863a82a9da65db8f.tar.xz UXP-88083f8c683c18f4de68a20c863a82a9da65db8f.zip | |
Merge branch 'master' into Sync-weave
Diffstat (limited to 'other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/BitTreeDecoder.java')
| -rw-r--r-- | other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/BitTreeDecoder.java | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/BitTreeDecoder.java b/other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/BitTreeDecoder.java new file mode 100644 index 000000000..6864c69ce --- /dev/null +++ b/other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/BitTreeDecoder.java @@ -0,0 +1,55 @@ +package SevenZip.Compression.RangeCoder;
+
+public class BitTreeDecoder
+{
+ short[] Models;
+ int NumBitLevels;
+
+ public BitTreeDecoder(int numBitLevels)
+ {
+ NumBitLevels = numBitLevels;
+ Models = new short[1 << numBitLevels];
+ }
+
+ public void Init()
+ {
+ Decoder.InitBitModels(Models);
+ }
+
+ public int Decode(Decoder rangeDecoder) throws java.io.IOException
+ {
+ int m = 1;
+ for (int bitIndex = NumBitLevels; bitIndex != 0; bitIndex--)
+ m = (m << 1) + rangeDecoder.DecodeBit(Models, m);
+ return m - (1 << NumBitLevels);
+ }
+
+ public int ReverseDecode(Decoder rangeDecoder) throws java.io.IOException
+ {
+ int m = 1;
+ int symbol = 0;
+ for (int bitIndex = 0; bitIndex < NumBitLevels; bitIndex++)
+ {
+ int bit = rangeDecoder.DecodeBit(Models, m);
+ m <<= 1;
+ m += bit;
+ symbol |= (bit << bitIndex);
+ }
+ return symbol;
+ }
+
+ public static int ReverseDecode(short[] Models, int startIndex,
+ Decoder rangeDecoder, int NumBitLevels) throws java.io.IOException
+ {
+ int m = 1;
+ int symbol = 0;
+ for (int bitIndex = 0; bitIndex < NumBitLevels; bitIndex++)
+ {
+ int bit = rangeDecoder.DecodeBit(Models, startIndex + m);
+ m <<= 1;
+ m += bit;
+ symbol |= (bit << bitIndex);
+ }
+ return symbol;
+ }
+}
|