llcrc.h

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#ifndef LL_LLCRC_H
#define LL_LLCRC_H

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class llcrc
//
// Simple 32 bit crc. To use, instantiate an LLCRC instance and feed
// it the bytes you want to check. It will update the internal crc as
// you go, and you can qery it at the end. As a horribly inefficient
// example (don't try this at work kids):
//
//  LLCRC crc;
//  FILE* fp = LLFile::fopen(filename,"rb");
//  while(!feof(fp)) {
//    crc.update(fgetc(fp));
//  }
//  fclose(fp);
//  llinfos << "File crc: " << crc.getCRC() << llendl;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

class LLCRC
{
protected:
        U32 mCurrent;
        
public:
        LLCRC();

        U32 getCRC() const;
        void update(U8 next_byte);
        void update(const U8* buffer, size_t buffer_size);
        void update(const char *filename);

#ifdef _DEBUG
        // This function runs tests to make sure the crc is
        // working. Returns TRUE if it is.
        static BOOL testHarness();
#endif
};


#endif // LL_LLCRC_H

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