Source code
Revision control
Copy as Markdown
Other Tools
// LzmaBase.cs↩
↩
namespace SevenZip.Compression.LZMA↩
{↩
internal abstract class Base↩
{↩
public const uint kNumRepDistances = 4;↩
public const uint kNumStates = 12;↩
↩
// static byte []kLiteralNextStates = {0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5};↩
// static byte []kMatchNextStates = {7, 7, 7, 7, 7, 7, 7, 10, 10, 10, 10, 10};↩
// static byte []kRepNextStates = {8, 8, 8, 8, 8, 8, 8, 11, 11, 11, 11, 11};↩
// static byte []kShortRepNextStates = {9, 9, 9, 9, 9, 9, 9, 11, 11, 11, 11, 11};↩
↩
public struct State↩
{↩
public uint Index;↩
public void Init() { Index = 0; }↩
public void UpdateChar()↩
{↩
if (Index < 4) Index = 0;↩
else if (Index < 10) Index -= 3;↩
else Index -= 6;↩
}↩
public void UpdateMatch() { Index = (uint)(Index < 7 ? 7 : 10); }↩
public void UpdateRep() { Index = (uint)(Index < 7 ? 8 : 11); }↩
public void UpdateShortRep() { Index = (uint)(Index < 7 ? 9 : 11); }↩
public bool IsCharState() { return Index < 7; }↩
}↩
↩
public const int kNumPosSlotBits = 6;↩
public const int kDicLogSizeMin = 0;↩
// public const int kDicLogSizeMax = 30;↩
// public const uint kDistTableSizeMax = kDicLogSizeMax * 2;↩
↩
public const int kNumLenToPosStatesBits = 2; // it's for speed optimization↩
public const uint kNumLenToPosStates = 1 << kNumLenToPosStatesBits;↩
↩
public const uint kMatchMinLen = 2;↩
↩
public static uint GetLenToPosState(uint len)↩
{↩
len -= kMatchMinLen;↩
if (len < kNumLenToPosStates)↩
return len;↩
return (uint)(kNumLenToPosStates - 1);↩
}↩
↩
public const int kNumAlignBits = 4;↩
public const uint kAlignTableSize = 1 << kNumAlignBits;↩
public const uint kAlignMask = (kAlignTableSize - 1);↩
↩
public const uint kStartPosModelIndex = 4;↩
public const uint kEndPosModelIndex = 14;↩
public const uint kNumPosModels = kEndPosModelIndex - kStartPosModelIndex;↩
↩
public const uint kNumFullDistances = 1 << ((int)kEndPosModelIndex / 2);↩
↩
public const uint kNumLitPosStatesBitsEncodingMax = 4;↩
public const uint kNumLitContextBitsMax = 8;↩
↩
public const int kNumPosStatesBitsMax = 4;↩
public const uint kNumPosStatesMax = (1 << kNumPosStatesBitsMax);↩
public const int kNumPosStatesBitsEncodingMax = 4;↩
public const uint kNumPosStatesEncodingMax = (1 << kNumPosStatesBitsEncodingMax);↩
↩
public const int kNumLowLenBits = 3;↩
public const int kNumMidLenBits = 3;↩
public const int kNumHighLenBits = 8;↩
public const uint kNumLowLenSymbols = 1 << kNumLowLenBits;↩
public const uint kNumMidLenSymbols = 1 << kNumMidLenBits;↩
public const uint kNumLenSymbols = kNumLowLenSymbols + kNumMidLenSymbols +↩
(1 << kNumHighLenBits);↩
public const uint kMatchMaxLen = kMatchMinLen + kNumLenSymbols - 1;↩
}↩
}↩