vl_nibble.h

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#ifndef VL_NIBBLE_H
#define VL_NIBBLE_H
 
#include <vl/vl_numtypes.h>
 
typedef vl_uint8_t vl_nibble_t;
 
#define VL_NIBBLE_MASK_HIGH 0xF0
#define VL_NIBBLE_MASK_LOW 0x0F
#define VL_NIBBLE_MAX 0xF
#define VL_NIBBLE_MIN 0x0
 
static inline vl_nibble_t vlNibbleLow(vl_uint8_t x) { return x & 0x0F; }
 
static inline vl_nibble_t vlNibbleHigh(vl_uint8_t x) { return (x >> 4) & 0x0F; }
 
static inline vl_uint8_t vlNibblePack(vl_nibble_t high, vl_nibble_t low)
{
    return (vl_uint8_t)((high << 4) | (low & 0x0F));
}
 
static inline vl_nibble_t vlNibbleAdd(vl_nibble_t a, vl_nibble_t b) { return (vl_nibble_t)((a + b) & 0x0F); }
 
static inline vl_nibble_t vlNibbleAddSat(vl_nibble_t a, vl_nibble_t b)
{
    vl_uint8_t sum = a + b;
    return (sum > 0x0F) ? 0x0F : (vl_nibble_t)sum;
}
 
static inline vl_nibble_t vlNibbleSub(vl_nibble_t a, vl_nibble_t b) { return (vl_nibble_t)((a - b) & 0x0F); }
 
static inline vl_nibble_t vlNibbleSubSat(vl_nibble_t a, vl_nibble_t b) { return (b > a) ? 0 : (vl_nibble_t)(a - b); }
 
static inline void vlNibbleSetHigh(vl_uint8_t* dst, vl_nibble_t v) { *dst = (*dst & 0x0F) | (v << 4); }
 
static inline void vlNibbleSetLow(vl_uint8_t* dst, vl_nibble_t v) { *dst = (*dst & 0xF0) | (v & 0x0F); }
 
#endif // VL_NIBBLE_H