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#pragma once
#include "packers.h"
#include <util/generic/array_ref.h>
// Stores an array of PODs in the trie (copying them with memcpy).
// Byte order and alignment are your problem.
template <class TRecord>
class TRegionPacker {
public:
typedef TArrayRef<TRecord> TRecords;
void UnpackLeaf(const char* p, TRecords& result) const {
size_t len;
NPackers::TIntegralPacker<size_t>().UnpackLeaf(p, len);
size_t start = NPackers::TIntegralPacker<size_t>().SkipLeaf(p);
result = TRecords((TRecord*)(p + start), len);
}
void PackLeaf(char* buf, const TRecords& data, size_t computedSize) const {
size_t len = data.size();
size_t lenChar = len * sizeof(TRecord);
size_t start = computedSize - lenChar;
NPackers::TIntegralPacker<size_t>().PackLeaf(buf, len, NPackers::TIntegralPacker<size_t>().MeasureLeaf(len));
memcpy(buf + start, data.data(), lenChar);
}
size_t MeasureLeaf(const TRecords& data) const {
size_t len = data.size();
return NPackers::TIntegralPacker<size_t>().MeasureLeaf(len) + len * sizeof(TRecord);
}
size_t SkipLeaf(const char* p) const {
size_t result = NPackers::TIntegralPacker<size_t>().SkipLeaf(p);
size_t len;
NPackers::TIntegralPacker<size_t>().UnpackLeaf(p, len);
result += len * sizeof(TRecord);
return result;
}
};
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