diff options
Diffstat (limited to 'other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder')
4 files changed, 393 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;
+ }
+}
diff --git a/other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/BitTreeEncoder.java b/other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/BitTreeEncoder.java new file mode 100644 index 000000000..b4c0a0721 --- /dev/null +++ b/other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/BitTreeEncoder.java @@ -0,0 +1,99 @@ +package SevenZip.Compression.RangeCoder;
+import java.io.IOException;
+
+public class BitTreeEncoder
+{
+ short[] Models;
+ int NumBitLevels;
+
+ public BitTreeEncoder(int numBitLevels)
+ {
+ NumBitLevels = numBitLevels;
+ Models = new short[1 << numBitLevels];
+ }
+
+ public void Init()
+ {
+ Decoder.InitBitModels(Models);
+ }
+
+ public void Encode(Encoder rangeEncoder, int symbol) throws IOException
+ {
+ int m = 1;
+ for (int bitIndex = NumBitLevels; bitIndex != 0; )
+ {
+ bitIndex--;
+ int bit = (symbol >>> bitIndex) & 1;
+ rangeEncoder.Encode(Models, m, bit);
+ m = (m << 1) | bit;
+ }
+ }
+
+ public void ReverseEncode(Encoder rangeEncoder, int symbol) throws IOException
+ {
+ int m = 1;
+ for (int i = 0; i < NumBitLevels; i++)
+ {
+ int bit = symbol & 1;
+ rangeEncoder.Encode(Models, m, bit);
+ m = (m << 1) | bit;
+ symbol >>= 1;
+ }
+ }
+
+ public int GetPrice(int symbol)
+ {
+ int price = 0;
+ int m = 1;
+ for (int bitIndex = NumBitLevels; bitIndex != 0; )
+ {
+ bitIndex--;
+ int bit = (symbol >>> bitIndex) & 1;
+ price += Encoder.GetPrice(Models[m], bit);
+ m = (m << 1) + bit;
+ }
+ return price;
+ }
+
+ public int ReverseGetPrice(int symbol)
+ {
+ int price = 0;
+ int m = 1;
+ for (int i = NumBitLevels; i != 0; i--)
+ {
+ int bit = symbol & 1;
+ symbol >>>= 1;
+ price += Encoder.GetPrice(Models[m], bit);
+ m = (m << 1) | bit;
+ }
+ return price;
+ }
+
+ public static int ReverseGetPrice(short[] Models, int startIndex,
+ int NumBitLevels, int symbol)
+ {
+ int price = 0;
+ int m = 1;
+ for (int i = NumBitLevels; i != 0; i--)
+ {
+ int bit = symbol & 1;
+ symbol >>>= 1;
+ price += Encoder.GetPrice(Models[startIndex + m], bit);
+ m = (m << 1) | bit;
+ }
+ return price;
+ }
+
+ public static void ReverseEncode(short[] Models, int startIndex,
+ Encoder rangeEncoder, int NumBitLevels, int symbol) throws IOException
+ {
+ int m = 1;
+ for (int i = 0; i < NumBitLevels; i++)
+ {
+ int bit = symbol & 1;
+ rangeEncoder.Encode(Models, startIndex + m, bit);
+ m = (m << 1) | bit;
+ symbol >>= 1;
+ }
+ }
+}
diff --git a/other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/Decoder.java b/other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/Decoder.java new file mode 100644 index 000000000..745338348 --- /dev/null +++ b/other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/Decoder.java @@ -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);
+ }
+}
diff --git a/other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/Encoder.java b/other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/Encoder.java new file mode 100644 index 000000000..2273e92e5 --- /dev/null +++ b/other-licenses/7zstub/src/Java/SevenZip/Compression/RangeCoder/Encoder.java @@ -0,0 +1,151 @@ +package SevenZip.Compression.RangeCoder;
+import java.io.IOException;
+
+public class Encoder
+{
+ static final int kTopMask = ~((1 << 24) - 1);
+
+ static final int kNumBitModelTotalBits = 11;
+ static final int kBitModelTotal = (1 << kNumBitModelTotalBits);
+ static final int kNumMoveBits = 5;
+
+ java.io.OutputStream Stream;
+
+ long Low;
+ int Range;
+ int _cacheSize;
+ int _cache;
+
+ long _position;
+
+ public void SetStream(java.io.OutputStream stream)
+ {
+ Stream = stream;
+ }
+
+ public void ReleaseStream()
+ {
+ Stream = null;
+ }
+
+ public void Init()
+ {
+ _position = 0;
+ Low = 0;
+ Range = -1;
+ _cacheSize = 1;
+ _cache = 0;
+ }
+
+ public void FlushData() throws IOException
+ {
+ for (int i = 0; i < 5; i++)
+ ShiftLow();
+ }
+
+ public void FlushStream() throws IOException
+ {
+ Stream.flush();
+ }
+
+ public void ShiftLow() throws IOException
+ {
+ int LowHi = (int)(Low >>> 32);
+ if (LowHi != 0 || Low < 0xFF000000L)
+ {
+ _position += _cacheSize;
+ int temp = _cache;
+ do
+ {
+ Stream.write(temp + LowHi);
+ temp = 0xFF;
+ }
+ while(--_cacheSize != 0);
+ _cache = (((int)Low) >>> 24);
+ }
+ _cacheSize++;
+ Low = (Low & 0xFFFFFF) << 8;
+ }
+
+ public void EncodeDirectBits(int v, int numTotalBits) throws IOException
+ {
+ for (int i = numTotalBits - 1; i >= 0; i--)
+ {
+ Range >>>= 1;
+ if (((v >>> i) & 1) == 1)
+ Low += Range;
+ if ((Range & Encoder.kTopMask) == 0)
+ {
+ Range <<= 8;
+ ShiftLow();
+ }
+ }
+ }
+
+
+ public long GetProcessedSizeAdd()
+ {
+ return _cacheSize + _position + 4;
+ }
+
+
+
+ static final int kNumMoveReducingBits = 2;
+ public static final int kNumBitPriceShiftBits = 6;
+
+ public static void InitBitModels(short []probs)
+ {
+ for (int i = 0; i < probs.length; i++)
+ probs[i] = (kBitModelTotal >>> 1);
+ }
+
+ public void Encode(short []probs, int index, int symbol) throws IOException
+ {
+ int prob = probs[index];
+ int newBound = (Range >>> kNumBitModelTotalBits) * prob;
+ if (symbol == 0)
+ {
+ Range = newBound;
+ probs[index] = (short)(prob + ((kBitModelTotal - prob) >>> kNumMoveBits));
+ }
+ else
+ {
+ Low += (newBound & 0xFFFFFFFFL);
+ Range -= newBound;
+ probs[index] = (short)(prob - ((prob) >>> kNumMoveBits));
+ }
+ if ((Range & kTopMask) == 0)
+ {
+ Range <<= 8;
+ ShiftLow();
+ }
+ }
+
+ private static int[] ProbPrices = new int[kBitModelTotal >>> kNumMoveReducingBits];
+
+ static
+ {
+ int kNumBits = (kNumBitModelTotalBits - kNumMoveReducingBits);
+ for (int i = kNumBits - 1; i >= 0; i--)
+ {
+ int start = 1 << (kNumBits - i - 1);
+ int end = 1 << (kNumBits - i);
+ for (int j = start; j < end; j++)
+ ProbPrices[j] = (i << kNumBitPriceShiftBits) +
+ (((end - j) << kNumBitPriceShiftBits) >>> (kNumBits - i - 1));
+ }
+ }
+
+ static public int GetPrice(int Prob, int symbol)
+ {
+ return ProbPrices[(((Prob - symbol) ^ ((-symbol))) & (kBitModelTotal - 1)) >>> kNumMoveReducingBits];
+ }
+ static public int GetPrice0(int Prob)
+ {
+ return ProbPrices[Prob >>> kNumMoveReducingBits];
+ }
+ static public int GetPrice1(int Prob)
+ {
+ return ProbPrices[(kBitModelTotal - Prob) >>> kNumMoveReducingBits];
+ }
+}
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