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#pragma once
#include <util/generic/array_ref.h>
#include <util/generic/vector.h>
#include <util/generic/strbuf.h>
#include <array>
namespace NCodecs::NFloatHuff {
TString Encode(TArrayRef<const float> factors);
class TDecoder {
public:
explicit TDecoder(TStringBuf data);
TVector<float> DecodeAll(size_t sizeHint = 0);
// Returns number of decoded floats. May be fewer than requested if the EOS is found.
size_t Decode(TArrayRef<float> dest);
// Returns the number of skipped values.
size_t Skip(size_t count);
bool HasMore() const;
private:
struct TState {
ui64 Workspace = 0;
int WorkspaceSize = 0;
ui64 Position = 0;
TStringBuf Data;
ui64 NextBitsUnmasked(int count); // The upper 64 - count bits may be arbitrary
ui64 PeekBits(int count);
void SkipBits(int count);
};
void FillDecodeBuffer();
TState State;
std::array<float, 128> DecodeBuffer;
// The range of already decompressed numbers inside the DecodeBuffer.
// Always kept non-empty until the EOS is encountered.
float* Begin;
float* End;
bool HitEos = false;
};
TVector<float> Decode(TStringBuf data, size_t sizeHint = 0);
}
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