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#ifndef S_LOGTBL_H__
#define S_LOGTBL_H__
#ifdef __cplusplus
extern "C" {
#endif
#define LOG_BITS 12
#define LIN_BITS 7
#define LOG_LIN_BITS 30
typedef struct
{
void *ctx;
void (*release)(void *ctx);
Uint32 lineartbl[(1 << LIN_BITS) + 1];
Uint32 logtbl[1 << LOG_BITS];
} KMIF_LOGTABLE;
KMIF_LOGTABLE *LogTableAddRef(void);
__inline static Uint32 LinToLog(KMIF_LOGTABLE *kmif_lt, Int32 l)
{
return (l < 0) ? (kmif_lt->lineartbl[-l] + 1) : kmif_lt->lineartbl[l];
}
__inline static Int32 LogToLin(KMIF_LOGTABLE *kmif_lt, Int32 l, Uint32 sft)
{
Int32 ret;
Uint32 ofs;
ofs = l + (sft << (LOG_BITS + 1));
sft = ofs >> (LOG_BITS + 1);
if (sft >= LOG_LIN_BITS) return 0;
ofs = (ofs >> 1) & ((1 << LOG_BITS) - 1);
ret = kmif_lt->logtbl[ofs] >> sft;
return (l & 1) ? -ret : ret;
}
#ifdef __cplusplus
}
#endif
#endif /* S_LOGTBL_H__ */
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