adler32.h

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#ifndef _SCC_ENCODE_ADLER32_H
#define _SCC_ENCODE_ADLER32_H
 
#include <cstdint>
 
namespace scc::encode {
 
class Adler32
{
    uint32_t m_val;
    int m_sz;
public:
    Adler32() : m_val(1), m_sz(0) {}
    Adler32(const void* loc, int len) : m_val(1), m_sz(0)
    {
        update(loc, len);
    }
    virtual ~Adler32() {}
 
    operator uint32_t() const { return m_val; }
    uint32_t val() const { return m_val; }
 
    int size()
    {
        return m_sz;
    }
 
    uint32_t reset()
    {
        m_val = 1;
        m_sz = 0;
        return m_val;
    }
    
    uint32_t reset(const void* loc, int len)
    {
        m_val = 1;
        m_sz = 0;
        return update(loc, len);
    }
 
    uint32_t update(const void*, int);
    
 
    /*  Combine two adler checksums, using the length of the second.
    
        The checksum has size incremented by len.
 
        \param add Checksum to combine.
    */
    uint32_t combine(const Adler32&);
 
    uint32_t rotate(unsigned char, unsigned char);
    uint32_t rotate(char xrem, char xadd) {
        return rotate(static_cast<unsigned char>(xrem), static_cast<unsigned char>(xadd));
    }
};
}
 
#endif