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#pragma once
#include <util/generic/hash.h>
#include <util/system/yassert.h>
#include <util/stream/output.h>
// this structure might be replaced with sthashtable class
template <class HF, class Eq, class size_type>
struct sthashtable_nvm_sv {
sthashtable_nvm_sv() {
if (sizeof(sthashtable_nvm_sv) != sizeof(HF) + sizeof(Eq) + 3 * sizeof(size_type)) {
memset(this, 0, sizeof(sthashtable_nvm_sv));
}
}
sthashtable_nvm_sv(const HF& phf, const Eq& peq, const size_type& pnb, const size_type& pne, const size_type& pnd)
: sthashtable_nvm_sv()
{
hf = phf;
eq = peq;
num_buckets = pnb;
num_elements = pne;
data_end_off = pnd;
}
HF hf;
Eq eq;
size_type num_buckets;
size_type num_elements;
size_type data_end_off;
};
/**
* Some hack to save both THashMap and sthash.
* Working with stHash does not depend on the template parameters, because the content of stHash is not used inside this method.
*/
template <class V, class K, class HF, class Ex, class Eq, class A>
template <class KeySaver>
inline int THashTable<V, K, HF, Ex, Eq, A>::save_for_st(IOutputStream* stream, KeySaver& ks, sthash<int, int, THash<int>, TEqualTo<int>, typename KeySaver::TSizeType>* stHash) const {
Y_ASSERT(!stHash || stHash->bucket_count() == bucket_count());
typedef sthashtable_nvm_sv<HF, Eq, typename KeySaver::TSizeType> sv_type;
sv_type sv = {this->_get_hash_fun(), this->_get_key_eq(), static_cast<typename KeySaver::TSizeType>(buckets.size()), static_cast<typename KeySaver::TSizeType>(num_elements), 0};
// to do: m.b. use just the size of corresponding object?
typename KeySaver::TSizeType cur_off = sizeof(sv_type) +
(sv.num_buckets + 1) * sizeof(typename KeySaver::TSizeType);
sv.data_end_off = cur_off;
const_iterator n;
for (n = begin(); n != end(); ++n) {
sv.data_end_off += static_cast<typename KeySaver::TSizeType>(ks.GetRecordSize(*n));
}
typename KeySaver::TSizeType* sb = stHash ? (typename KeySaver::TSizeType*)(stHash->buckets()) : nullptr;
if (stHash)
sv.data_end_off += static_cast<typename KeySaver::TSizeType>(sb[buckets.size()] - sb[0]);
//saver.Align(sizeof(char*));
stream->Write(&sv, sizeof(sv));
size_type i;
//save vector
for (i = 0; i < buckets.size(); ++i) {
node* cur = buckets[i];
stream->Write(&cur_off, sizeof(cur_off));
if (cur) {
while (!((uintptr_t)cur & 1)) {
cur_off += static_cast<typename KeySaver::TSizeType>(ks.GetRecordSize(cur->val));
cur = cur->next;
}
}
if (stHash)
cur_off += static_cast<typename KeySaver::TSizeType>(sb[i + 1] - sb[i]);
}
stream->Write(&cur_off, sizeof(cur_off)); // end mark
for (i = 0; i < buckets.size(); ++i) {
node* cur = buckets[i];
if (cur) {
while (!((uintptr_t)cur & 1)) {
ks.SaveRecord(stream, cur->val);
cur = cur->next;
}
}
if (stHash)
stream->Write((const char*)stHash + sb[i], sb[i + 1] - sb[i]);
}
return 0;
}
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