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#pragma once
#include "bin_saver.h"
namespace NMemIoInternals {
class TMemoryStream: public IBinaryStream {
TVector<char>& Data;
ui64 Pos;
public:
TMemoryStream(TVector<char>* data, ui64 pos = 0)
: Data(*data)
, Pos(pos)
{
}
~TMemoryStream() override {
} // keep gcc happy
bool IsValid() const override {
return true;
}
bool IsFailed() const override {
return false;
}
private:
int WriteImpl(const void* userBuffer, int size) override {
if (size == 0)
return 0;
Y_ASSERT(size > 0);
if (Pos + size > Data.size())
Data.yresize(Pos + size);
memcpy(&Data[Pos], userBuffer, size);
Pos += size;
return size;
}
int ReadImpl(void* userBuffer, int size) override {
if (size == 0)
return 0;
Y_ASSERT(size > 0);
int res = Min(Data.size() - Pos, (ui64)size);
if (res)
memcpy(userBuffer, &Data[Pos], res);
Pos += res;
return res;
}
};
template <class T>
inline void SerializeMem(bool bRead, TVector<char>* data, T& c, bool stableOutput = false) {
if (IBinSaver::HasNonTrivialSerializer<T>(0u)) {
TMemoryStream f(data);
{
IBinSaver bs(f, bRead, stableOutput);
bs.Add(1, &c);
}
} else {
if (bRead) {
Y_ASSERT(data->size() == sizeof(T));
c = *reinterpret_cast<T*>(&(*data)[0]);
} else {
data->yresize(sizeof(T));
*reinterpret_cast<T*>(&(*data)[0]) = c;
}
}
}
////////////////////////////////////////////////////////////////////////////
class THugeMemoryStream: public IBinaryStream {
TVector<TVector<char>>& Data;
i64 Block, Pos;
bool ShrinkOnRead;
enum {
MAX_BLOCK_SIZE = 1024 * 1024 // Aligned with cache size
};
public:
THugeMemoryStream(TVector<TVector<char>>* data, bool shrinkOnRead = false)
: Data(*data)
, Block(0)
, Pos(0)
, ShrinkOnRead(shrinkOnRead)
{
Y_ASSERT(!data->empty());
}
~THugeMemoryStream() override {
} // keep gcc happy
bool IsValid() const override {
return true;
}
bool IsFailed() const override {
return false;
}
private:
int WriteImpl(const void* userDataArg, int sizeArg) override {
if (sizeArg == 0)
return 0;
const char* userData = (const char*)userDataArg;
i64 size = sizeArg;
i64 newSize = Pos + size;
if (newSize > Data[Block].ysize()) {
while (newSize > MAX_BLOCK_SIZE) {
int maxWrite = MAX_BLOCK_SIZE - Pos;
Data[Block].yresize(MAX_BLOCK_SIZE);
if (maxWrite) {
memcpy(&Data[Block][Pos], userData, maxWrite);
userData += maxWrite;
size -= maxWrite;
}
++Block;
Pos = 0;
Data.resize(Block + 1);
newSize = Pos + size;
}
Data[Block].yresize(newSize);
}
if (size) {
memcpy(&Data[Block][Pos], userData, size);
}
Pos += size;
return sizeArg;
}
int ReadImpl(void* userDataArg, int sizeArg) override {
if (sizeArg == 0)
return 0;
char* userData = (char*)userDataArg;
i64 size = sizeArg;
i64 rv = 0;
while (size > 0) {
int curBlockSize = Data[Block].ysize();
int maxRead = 0;
if (Pos + size > curBlockSize) {
maxRead = curBlockSize - Pos;
if (maxRead) {
memcpy(userData, &Data[Block][Pos], maxRead);
userData += maxRead;
size -= maxRead;
rv += maxRead;
}
if (Block + 1 == Data.ysize()) {
memset(userData, 0, size);
return rv;
}
if (ShrinkOnRead) {
TVector<char>().swap(Data[Block]);
}
++Block;
Pos = 0;
} else {
memcpy(userData, &Data[Block][Pos], size);
Pos += size;
rv += size;
return rv;
}
}
return rv;
}
};
template <class T>
inline void SerializeMem(bool bRead, TVector<TVector<char>>* data, T& c, bool stableOutput = false) {
if (data->empty()) {
data->resize(1);
}
THugeMemoryStream f(data);
{
IBinSaver bs(f, bRead, stableOutput);
bs.Add(1, &c);
}
}
}
template <class T>
inline void SerializeMem(const TVector<char>& data, T& c) {
if (IBinSaver::HasNonTrivialSerializer<T>(0u)) {
TVector<char> tmp(data);
SerializeFromMem(&tmp, c);
} else {
Y_ASSERT(data.size() == sizeof(T));
c = *reinterpret_cast<const T*>(&data[0]);
}
}
template <class T, class D>
inline void SerializeToMem(D* data, T& c, bool stableOutput = false) {
NMemIoInternals::SerializeMem(false, data, c, stableOutput);
}
template <class T, class D>
inline void SerializeFromMem(D* data, T& c, bool stableOutput = false) {
NMemIoInternals::SerializeMem(true, data, c, stableOutput);
}
// Frees memory in (*data)[i] immediately upon it's deserialization, thus keeps low overall memory consumption for data + object.
template <class T>
inline void SerializeFromMemShrinkInput(TVector<TVector<char>>* data, T& c) {
if (data->empty()) {
data->resize(1);
}
NMemIoInternals::THugeMemoryStream f(data, true);
{
IBinSaver bs(f, true, false);
bs.Add(1, &c);
}
data->resize(0);
data->shrink_to_fit();
}
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