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#pragma once
#include <util/generic/array_ref.h>
#include <util/generic/vector.h>
#include <util/generic/yexception.h>
class TBlob;
class TChunkedDataReader {
public:
TChunkedDataReader(const TBlob& blob);
inline const void* GetBlock(size_t index) const {
CheckIndex(index);
return Offsets[index];
}
inline size_t GetBlockLen(size_t index) const {
CheckIndex(index);
if (Version == 0) {
if (index + 1 < Offsets.size()) {
return Offsets[index + 1] - Offsets[index];
}
return Size - (Offsets.back() - Offsets.front());
}
return Lengths[index];
}
TBlob GetBlob(size_t index) const;
template <typename T>
TArrayRef<const T> GetRegion(size_t index) const {
size_t len = GetBlockLen(index);
Y_ENSURE(len % sizeof(T) == 0, "wrong data padding");
return TArrayRef<const T>(reinterpret_cast<const T*>(GetBlock(index)), len / sizeof(T));
}
inline size_t GetBlocksCount() const {
return Offsets.size();
}
private:
inline void CheckIndex(size_t index) const {
if (index >= GetBlocksCount()) {
ythrow yexception() << "requested block " << index << " of " << GetBlocksCount() << " blocks";
}
}
private:
ui64 Version = 0;
TVector<const char*> Offsets;
TVector<size_t> Lengths;
size_t Size = 0;
};
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