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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/RangeCoder.cs
+16 -7
View File
@@ -2,18 +2,18 @@ using System;
namespace SevenZip.Compression.RangeCoder
{
class Encoder
internal class Encoder
{
public const uint kTopValue = (1 << 24);
System.IO.Stream Stream;
private System.IO.Stream Stream;
public UInt64 Low;
public uint Range;
uint _cacheSize;
byte _cache;
private uint _cacheSize;
private byte _cache;
long StartPosition;
private long StartPosition;
public void SetStream(System.IO.Stream stream)
{
@@ -38,7 +38,9 @@ namespace SevenZip.Compression.RangeCoder
public void FlushData()
{
for (int i = 0; i < 5; i++)
{
ShiftLow();
}
}
public void FlushStream()
@@ -64,7 +66,7 @@ namespace SevenZip.Compression.RangeCoder
public void ShiftLow()
{
if ((uint)Low < (uint)0xFF000000 || (uint)(Low >> 32) == 1)
if ((uint)Low < 0xFF000000 || (uint)(Low >> 32) == 1)
{
byte temp = _cache;
do
@@ -85,7 +87,10 @@ namespace SevenZip.Compression.RangeCoder
{
Range >>= 1;
if (((v >> i) & 1) == 1)
{
Low += Range;
}
if (Range < kTopValue)
{
Range <<= 8;
@@ -98,7 +103,9 @@ namespace SevenZip.Compression.RangeCoder
{
uint newBound = (Range >> numTotalBits) * size0;
if (symbol == 0)
{
Range = newBound;
}
else
{
Low += newBound;
@@ -119,7 +126,7 @@ namespace SevenZip.Compression.RangeCoder
}
}
class Decoder
internal class Decoder
{
public const uint kTopValue = (1 << 24);
public uint Range;
@@ -135,7 +142,9 @@ namespace SevenZip.Compression.RangeCoder
Code = 0;
Range = 0xFFFFFFFF;
for (int i = 0; i < 5; i++)
{
Code = (Code << 8) | (byte)Stream.ReadByte();
}
}
public void ReleaseStream()