xevion/easy7zip
1
0
Fork 0
mirror of https://github.com/Xevion/easy7zip.git synced 2025-12-13 12:11:38 -06:00
Code Issues Packages Projects Releases Wiki Activity

4.20

Browse Source
This commit is contained in:
Igor Pavlov
2005-05-30 00:00:00 +00:00
committed by Kornel Lesiński
parent 8c1b5c7b7e
commit 3c510ba80b
926 changed files with 40559 additions and 23519 deletions
Download Patch File Download Diff File Expand all files Collapse all files

49
7zip/Common/MSBFDecoder.h
View File

@@ -1,8 +1,6 @@
// Stream/MSBFDecoder.h
// MSBFDecoder.h
// the Most Significant Bit of byte is First
#pragma once
#ifndef __STREAM_MSBFDECODER_H
#define __STREAM_MSBFDECODER_H
@@ -10,37 +8,32 @@ namespace NStream {
namespace NMSBF {
const int kNumBigValueBits = 8 * 4;
const int kNumValueBytes = 3;
const int kNumValueBits = 8 * kNumValueBytes;
const UINT32 kMask = (1 << kNumValueBits) - 1;
const UInt32 kMask = (1 << kNumValueBits) - 1;
template<class TInByte>
class CDecoder
{
TInByte m_Stream;
UINT32 m_BitPos;
UINT32 m_Value;
UInt32 m_BitPos;
UInt32 m_Value;
public:
void Init(ISequentialInStream *aStream)
bool Create(UInt32 bufferSize) { return m_Stream.Create(bufferSize); }
void SetStream(ISequentialInStream *inStream) { m_Stream.SetStream(inStream);}
void ReleaseStream() { m_Stream.ReleaseStream();}
void Init()
{
m_Stream.Init(aStream);
m_Stream.Init();
m_BitPos = kNumBigValueBits;
Normalize();
}
/*
void ReleaseStream()
{
m_Stream.ReleaseStream();
}
*/
UINT64 GetProcessedSize() const
UInt64 GetProcessedSize() const
{ return m_Stream.GetProcessedSize() - (kNumBigValueBits - m_BitPos) / 8; }
UInt32 GetBitPosition() const { return (m_BitPos & 7); }
void Normalize()
{
@@ -48,23 +41,23 @@ public:
m_Value = (m_Value << 8) | m_Stream.ReadByte();
}
UINT32 GetValue(UINT32 aNumBits) const
UInt32 GetValue(UInt32 numBits) const
{
// return (m_Value << m_BitPos) >> (kNumBigValueBits - aNumBits);
return ((m_Value >> (8 - m_BitPos)) & kMask) >> (kNumValueBits - aNumBits);
// return (m_Value << m_BitPos) >> (kNumBigValueBits - numBits);
return ((m_Value >> (8 - m_BitPos)) & kMask) >> (kNumValueBits - numBits);
}
void MovePos(UINT32 aNumBits)
void MovePos(UInt32 numBits)
{
m_BitPos += aNumBits;
m_BitPos += numBits;
Normalize();
}
UINT32 ReadBits(UINT32 aNumBits)
UInt32 ReadBits(UInt32 numBits)
{
UINT32 aRes = GetValue(aNumBits);
MovePos(aNumBits);
return aRes;
UInt32 res = GetValue(numBits);
MovePos(numBits);
return res;
}
};