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#pragma once
#include <util/system/defaults.h>
namespace NCompProto {
struct TEmpty {
};
struct TTable {
TTable() {
for (size_t i = 0; i < 64; ++i) {
CodeBase[i] = 0;
CodeMask[i] = 0;
Length[i] = 0;
PrefLength[i] = 0;
Id[i] = 0;
}
}
ui32 CodeBase[64];
ui32 CodeMask[64];
ui8 Length[64];
ui8 PrefLength[64];
ui8 Id[64];
enum {
PAGE_BOUND = 4096,
#ifdef WITH_VALGRIND
SAFE_MODE = 1,
#else
#if defined(__has_feature)
#if __has_feature(address_sanitizer)
SAFE_MODE = 1,
#else
SAFE_MODE = 0,
#endif
#else
SAFE_MODE = 0,
#endif
#endif
};
ui32 inline Decompress(const ui8* codes, ui64& offset) const {
codes += (offset >> 3);
size_t pageOff = size_t(codes) % PAGE_BOUND;
size_t readOff = offset & 7;
if (pageOff > PAGE_BOUND - 8 || SAFE_MODE) {
size_t off = 8;
ui64 res = codes[0];
++codes;
ui64 indexCur = ((res + 0x0000) >> readOff) & 63;
ui64 indexAlt = ((res + 0xff00) >> readOff) & 63;
if (Id[indexCur] != Id[indexAlt]) {
res += (ui64(codes[0]) << off);
++codes;
off += 8;
indexCur = (res >> readOff) & 63;
}
ui64 index = indexCur;
ui64 length = Length[index];
while (off < readOff + length) {
res += (ui64(codes[0]) << off);
++codes;
off += 8;
}
offset += length;
ui64 code = res >> readOff;
return (((ui32)(code >> PrefLength[index])) & CodeMask[index]) + CodeBase[index];
}
ui64 code = ((const ui64*)(codes))[0] >> readOff;
ui64 index = code & 63;
offset += Length[index];
return (((ui32)(code >> PrefLength[index])) & CodeMask[index]) + CodeBase[index];
}
};
}
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