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comparison: other-licenses/7zstub/src/7zip/Common/MSBFEncoder.h
other-licenses/7zstub/src/7zip/Common/MSBFEncoder.h
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| -1:000000000000 | 0:653873668407 |
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| 1 // Stream/MSBFEncoder.h | |
| 2 | |
| 3 #ifndef __STREAM_MSBFENCODER_H | |
| 4 #define __STREAM_MSBFENCODER_H | |
| 5 | |
| 6 #include "Common/Defs.h" | |
| 7 #include "../IStream.h" | |
| 8 #include "OutBuffer.h" | |
| 9 | |
| 10 namespace NStream { | |
| 11 namespace NMSBF { | |
| 12 | |
| 13 template<class TOutByte> | |
| 14 class CEncoder | |
| 15 { | |
| 16 TOutByte m_Stream; | |
| 17 int m_BitPos; | |
| 18 Byte m_CurByte; | |
| 19 public: | |
| 20 bool Create(UInt32 bufferSize) { return m_Stream.Create(bufferSize); } | |
| 21 void SetStream(ISequentialOutStream *outStream) { m_Stream.SetStream(outStream);} | |
| 22 void ReleaseStream() { m_Stream.ReleaseStream(); } | |
| 23 void Init() | |
| 24 { | |
| 25 m_Stream.Init(); | |
| 26 m_BitPos = 8; | |
| 27 m_CurByte = 0; | |
| 28 } | |
| 29 HRESULT Flush() | |
| 30 { | |
| 31 if(m_BitPos < 8) | |
| 32 WriteBits(0, m_BitPos); | |
| 33 return m_Stream.Flush(); | |
| 34 } | |
| 35 | |
| 36 void WriteBits(UInt32 value, int numBits) | |
| 37 { | |
| 38 while(numBits > 0) | |
| 39 { | |
| 40 if (numBits < m_BitPos) | |
| 41 { | |
| 42 m_CurByte |= ((Byte)value << (m_BitPos -= numBits)); | |
| 43 return; | |
| 44 } | |
| 45 numBits -= m_BitPos; | |
| 46 UInt32 newBits = (value >> numBits); | |
| 47 value -= (newBits << numBits); | |
| 48 m_Stream.WriteByte(m_CurByte | (Byte)newBits); | |
| 49 m_BitPos = 8; | |
| 50 m_CurByte = 0; | |
| 51 } | |
| 52 } | |
| 53 UInt64 GetProcessedSize() const { | |
| 54 return m_Stream.GetProcessedSize() + (8 - m_BitPos + 7) / 8; } | |
| 55 }; | |
| 56 | |
| 57 }} | |
| 58 | |
| 59 #endif |
