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#pragma once
#include <yql/essentials/minikql/defs.h>
#include <yql/essentials/minikql/mkql_node.h>
#include <yql/essentials/public/udf/udf_value.h>
#include <yql/essentials/utils/swap_bytes.h>
#include <util/generic/vector.h>
namespace NKikimr {
namespace NMiniKQL {
namespace NDetail {
using NYql::SwapBytes;
Y_FORCE_INLINE
void EnsureInputSize(TStringBuf& input, size_t size) {
MKQL_ENSURE(input.size() >= size, "premature end of input");
}
template <bool Desc>
Y_FORCE_INLINE
void EncodeBool(TVector<ui8>& output, bool value) {
output.push_back(Desc ? 0xFF ^ ui8(value) : ui8(value));
}
template <bool Desc>
Y_FORCE_INLINE
bool DecodeBool(TStringBuf& input) {
EnsureInputSize(input, 1);
auto result = Desc ? bool(0xFF ^ ui8(input[0])) : bool(input[0]);
input.Skip(1);
return result;
}
template <typename TUnsigned, bool Desc>
Y_FORCE_INLINE
void EncodeUnsigned(TVector<ui8>& output, TUnsigned value) {
constexpr size_t size = sizeof(TUnsigned);
if (Desc) {
value = ~value;
}
output.resize(output.size() + size);
WriteUnaligned<TUnsigned>(output.end() - size, SwapBytes(value));
}
template <typename TUnsigned, bool Desc>
Y_FORCE_INLINE
TUnsigned DecodeUnsigned(TStringBuf& input) {
constexpr size_t size = sizeof(TUnsigned);
EnsureInputSize(input, size);
auto value = ReadUnaligned<TUnsigned>(input.data());
input.Skip(size);
value = SwapBytes(value);
if (Desc) {
value = ~value;
}
return value;
}
template <typename TSigned, bool Desc>
Y_FORCE_INLINE
void EncodeSigned(TVector<ui8>& output, TSigned value) {
using TUnsigned = std::make_unsigned_t<TSigned>;
constexpr size_t size = sizeof(TUnsigned);
constexpr TUnsigned shift = TUnsigned(1) << (size * 8 - 1);
EncodeUnsigned<TUnsigned, Desc>(output, TUnsigned(value) + shift);
}
template <typename TSigned, bool Desc>
Y_FORCE_INLINE
TSigned DecodeSigned(TStringBuf& input) {
using TUnsigned = std::make_unsigned_t<TSigned>;
constexpr size_t size = sizeof(TUnsigned);
constexpr TUnsigned shift = TUnsigned(1) << (size * 8 - 1);
return TSigned(DecodeUnsigned<TUnsigned, Desc>(input) - shift);
}
enum class EFPCode : ui8 {
NegInf = 0,
Neg = 1,
Zero = 2,
Pos = 3,
PosInf = 4,
Nan = 5
};
template <typename TFloat>
struct TFloatToInteger {};
template <>
struct TFloatToInteger<float> {
using TType = ui32;
};
template <>
struct TFloatToInteger<double> {
using TType = ui64;
};
static_assert(std::numeric_limits<float>::is_iec559, "float type is not iec559(ieee754)");
static_assert(std::numeric_limits<double>::is_iec559, "double type is not iec559(ieee754)");
template <typename TFloat, bool Desc>
Y_FORCE_INLINE
void EncodeFloating(TVector<ui8>& output, TFloat value) {
using TInteger = typename TFloatToInteger<TFloat>::TType;
EFPCode code;
switch (std::fpclassify(value)) {
case FP_NORMAL:
case FP_SUBNORMAL: {
auto integer = ReadUnaligned<TInteger>(&value);
if (value < 0) {
integer = ~integer;
code = EFPCode::Neg;
}
else {
code = EFPCode::Pos;
}
output.push_back(Desc ? 0xFF ^ ui8(code) : ui8(code));
EncodeUnsigned<TInteger, Desc>(output, integer);
return;
}
case FP_ZERO:
code = EFPCode::Zero;
break;
case FP_INFINITE:
code = value < 0 ? EFPCode::NegInf : EFPCode::PosInf;
break;
default:
code = EFPCode::Nan;
break;
}
output.push_back(Desc ? 0xFF ^ ui8(code) : ui8(code));
}
template <typename TFloat, bool Desc>
Y_FORCE_INLINE
TFloat DecodeFloating(TStringBuf& input) {
using TInteger = typename TFloatToInteger<TFloat>::TType;
EnsureInputSize(input, 1);
auto code = EFPCode(Desc ? 0xFF ^ input[0] : input[0]);
input.Skip(1);
bool negative;
switch (code) {
case EFPCode::Zero:
return 0;
case EFPCode::NegInf:
return -std::numeric_limits<TFloat>::infinity();
case EFPCode::PosInf:
return std::numeric_limits<TFloat>::infinity();
case EFPCode::Nan:
return std::numeric_limits<TFloat>::quiet_NaN();
case EFPCode::Neg:
negative = true;
break;
case EFPCode::Pos:
negative = false;
break;
default:
MKQL_ENSURE(false, "floating point data is corrupted");
}
auto integer = DecodeUnsigned<TInteger, Desc>(input);
if (negative) {
integer = ~integer;
}
return ReadUnaligned<TFloat>(&integer);
}
constexpr ui8 BlockCode = 0x1F;
constexpr size_t BlockSize = 15;
constexpr size_t BlockSizeUi64 = BlockSize / 8 + 1;
template <bool Desc>
Y_FORCE_INLINE
void EncodeString(TVector<ui8>& output, TStringBuf value) {
size_t part = 0;
while (!value.empty()) {
union {
ui8 buffer[BlockSize + 1];
ui64 buffer64[BlockSizeUi64];
};
part = std::min(value.size(), BlockSize);
if (part == BlockSize) {
std::memcpy(buffer + 1, value.data(), BlockSize);
}
else {
for (size_t i = 0; i < BlockSizeUi64; ++i) {
buffer64[i] = 0;
}
std::memcpy(buffer + 1, value.data(), part);
}
value.Skip(part);
buffer[0] = BlockCode;
if (Desc) {
for (size_t i = 0; i < BlockSizeUi64; ++i) {
buffer64[i] ^= std::numeric_limits<ui64>::max();
}
}
output.insert(output.end(), buffer, buffer + BlockSize + 1);
}
auto lastLength = ui8(part);
output.push_back(Desc ? 0xFF ^ lastLength : lastLength);
}
template <bool Desc>
Y_FORCE_INLINE
TStringBuf DecodeString(TStringBuf& input, TVector<ui8>& value) {
EnsureInputSize(input, 1);
ui8 code = Desc ? 0xFF ^ input[0] : input[0];
input.Skip(1);
if (code != BlockCode) {
MKQL_ENSURE(code == 0, TStringBuilder() << "unknown string block code: " << code);
return TStringBuf();
}
while (code == BlockCode) {
union {
ui8 buffer[BlockSize + 1];
ui64 buffer64[BlockSizeUi64];
};
EnsureInputSize(input, BlockSize + 1);
std::memcpy(buffer, input.data(), BlockSize + 1);
input.Skip(BlockSize + 1);
if (Desc) {
for (size_t i = 0; i < BlockSizeUi64; ++i) {
buffer64[i] ^= std::numeric_limits<ui64>::max();
}
}
value.insert(value.end(), buffer, buffer + BlockSize);
code = buffer[BlockSize];
}
auto begin = (const char*)value.begin();
auto end = (const char*)value.end() - BlockSize + code;
return TStringBuf(begin, end - begin);
}
}
} // NMiniKQL
} // NKikimr
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