BitField.hpp

00001  /***********************************************************************
00002  *                                                                      *
00003  * ViTooKi                                                              *
00004  *                                                                      *
00005  * title:       BitField.hpp                                                  *
00006  *                                                                      *
00007  *                                                                      *
00008  *                                                                      *
00009  * ITEC institute of the University of Klagenfurt (Austria)             *
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00035 
00036  /***********************************************************************
00037  *                                                                      *
00038  *  REVISION HISTORY:                                                   *
00039  *                                                                      *
00040  *                                                                      *
00041  *                                                                      *
00042  ***********************************************************************/
00043 
00044 #ifndef PS_MPEG4ITEC_BITFIELD
00045 #define PS_MPEG4ITEC_BITFIELD
00046 #include"global.hpp"
00047 #ifdef ISOMP4
00048 #include "ISOMovies.h"
00049 #endif
00050 
00062 class BitField {
00063 private:        
00064         u32* bits;      
00065         u32 maxSize;
00066 public:
00067         BitField(char* data, u32 size);
00068         BitField(u32 size, bool initValue);
00069         virtual ~BitField();
00072         void setBit(u32 pos);
00075         void clearBit(u32 pos);
00078         bool getBit(u32 pos) const;     
00079         
00081         void invert();
00082         
00092         u32 getBitRange(u32 startPos, int* nrBits, bool littleEndian=true);
00093         
00094         /* writes @param nrBits of @param value starting with @param startBit at position @param startPos.
00095          * returns false if startBit+nrBits is greater 32, if nrBits is not in range 1..32,
00096          * if startBit is not in range 0..32-nrBits, or startPos+nBits is greater than maxSize
00097          * @param littleEndian specifies endianness. When set to true the decimal value for the
00098          * requested bitrange is calculated as if the first bit has the lowest value.
00099          * e.g.: Bit 0 1000 Bit 3 -> littleEndian=true --> 1 littleEndian=false --> 8
00100          */
00101         bool writeBitRange(u32 startPos, int nrBits, u32 value, u32 startBit, bool littleEndian=true);
00103         bool isAllSet() const;
00105         bool isAllCleared() const;
00107         float getPercentageSetBits() const;
00108 
00118         BitField* createWithNewSize(u32 size, bool initValueForMissing);
00119         u32 getSize() const { return maxSize;}
00122         const char* toBinaryString(u32* sizeInU32) const;
00125         char* toAsciiString() const;
00131         char* toHexString() const;
00134         static BitField* fromAsciiString(const char* str);
00137         static BitField* fromBinaryString(const char* bin, u32 numBits);
00139         static BitField* fromBinaryString(char* bin, u32 numBits);
00140         static BitField* fromHexString(const char* bin);
00142         static void doTest();
00143 };
00144 #endif
00145 
00146
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BitField.hpp
