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/*
* Copyright (c) 2012 Daisuke Okanohara
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above Copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above Copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the authors nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*/
#ifndef RSDIC_ENUM_CODER_HPP_
#define RSDIC_ENUM_CODER_HPP_
#include <stdint.h>
#include "Const.hpp"
namespace rsdic{
class EnumCoder{
public:
static uint64_t Encode(uint64_t val, uint64_t rank_sb);
static uint64_t Decode(uint64_t code, uint64_t rank_sb);
static bool GetBit(uint64_t code, uint64_t rank_sb, uint64_t pos);
static uint64_t Rank(uint64_t code, uint64_t rank_sb, uint64_t pos);
static uint64_t Select(uint64_t code, uint64_t rank_sb, uint64_t num, bool bit);
static uint64_t Len(uint64_t rank_sb){
return kEnumCodeLength_[rank_sb];
}
static uint64_t Select0(uint64_t code, uint64_t rank_sb, uint64_t num);
static uint64_t Select1(uint64_t code, uint64_t rank_sb, uint64_t num);
private:
static uint64_t PopCount(uint64_t code);
static uint64_t SelectRaw(uint64_t code, uint64_t num);
static const uint8_t kPopCount_[256];
static const uint64_t kCombinationTable64_[65][65];
static const uint8_t kEnumCodeLength_[65];
};
}
#endif // RSDIC_ENUM_CODER_HPP_
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