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