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This commit is contained in:
Gustave Monce
2021-08-09 20:21:09 +02:00
parent 9865ef7f79
commit 847ce0506d
411 changed files with 5922 additions and 54941 deletions
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7zip/Compress/RangeCoder/RangeCoderBitTree.cs
+16 -9
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@@ -2,10 +2,10 @@ using System;
namespace SevenZip.Compression.RangeCoder
{
struct BitTreeEncoder
internal struct BitTreeEncoder
{
BitEncoder[] Models;
int NumBitLevels;
private readonly BitEncoder[] Models;
private readonly int NumBitLevels;
public BitTreeEncoder(int numBitLevels)
{
@@ -16,7 +16,9 @@ namespace SevenZip.Compression.RangeCoder
public void Init()
{
for (uint i = 1; i < (1 << NumBitLevels); i++)
{
Models[i].Init();
}
}
public void Encode(Encoder rangeEncoder, UInt32 symbol)
@@ -100,10 +102,10 @@ namespace SevenZip.Compression.RangeCoder
}
}
struct BitTreeDecoder
internal struct BitTreeDecoder
{
BitDecoder[] Models;
int NumBitLevels;
private readonly BitDecoder[] Models;
private readonly int NumBitLevels;
public BitTreeDecoder(int numBitLevels)
{
@@ -114,18 +116,23 @@ namespace SevenZip.Compression.RangeCoder
public void Init()
{
for (uint i = 1; i < (1 << NumBitLevels); i++)
{
Models[i].Init();
}
}
public uint Decode(RangeCoder.Decoder rangeDecoder)
public uint Decode(Decoder rangeDecoder)
{
uint m = 1;
for (int bitIndex = NumBitLevels; bitIndex > 0; bitIndex--)
{
m = (m << 1) + Models[m].Decode(rangeDecoder);
}
return m - ((uint)1 << NumBitLevels);
}
public uint ReverseDecode(RangeCoder.Decoder rangeDecoder)
public uint ReverseDecode(Decoder rangeDecoder)
{
uint m = 1;
uint symbol = 0;
@@ -140,7 +147,7 @@ namespace SevenZip.Compression.RangeCoder
}
public static uint ReverseDecode(BitDecoder[] Models, UInt32 startIndex,
RangeCoder.Decoder rangeDecoder, int NumBitLevels)
Decoder rangeDecoder, int NumBitLevels)
{
uint m = 1;
uint symbol = 0;