dcmjpls/libcharls/lokuptbl.h

//
// (C) Jan de Vaan 2007-2010, all rights reserved. See the accompanying "License.txt" for licensed use.
//


#ifndef CHARLS_LOOKUPTABLE
#define CHARLS_LOOKUPTABLE

// Tables for fast decoding of short Golomb Codes.

struct Code
{
    Code()
    {
    }

    Code(LONG value, LONG length)   :
        _value(value),
        _length(length)
    {
    }

    LONG GetValue() const
        { return _value; }
    LONG GetLength() const
        { return _length; }

    LONG _value;
    LONG _length;
};



class CTable
{
public:

    enum { cbit = 8 } ;

    CTable()
    {
        ::memset(rgtype, 0, sizeof(rgtype));
    }

    void AddEntry(BYTE bvalue, Code c);

    inlinehint const Code& Get(LONG value)
        { return rgtype[value]; }
private:
    Code rgtype[1 << cbit];
};


//
// AddEntry
//
void CTable::AddEntry(BYTE bvalue, Code c)
{
    LONG length = c.GetLength();
    ASSERT(length <= cbit);

    for (LONG i = 0; i < LONG(1) << (cbit - length); ++i)
    {
        ASSERT(rgtype[(bvalue << (cbit - length)) + i].GetLength() == 0);
        rgtype[(bvalue << (cbit - length)) + i] = c;
    }
}

#endif

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