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#include "mkql_buffer.h"
namespace NKikimr {
namespace NMiniKQL {
const size_t TBufferPage::PageCapacity = TBufferPage::PageAllocSize - sizeof(TBufferPage);
TBufferPage* TBufferPage::Allocate() {
static_assert(PageAllocSize <= std::numeric_limits<ui32>::max());
static_assert(sizeof(TBufferPage) < PageAllocSize, "Page allocation size is too small");
void* ptr = malloc(PageAllocSize);
if (!ptr) {
throw std::bad_alloc();
}
TBufferPage* result = ::new (ptr) TBufferPage();
return result;
}
void TBufferPage::Free(TBufferPage* page) {
free(page);
}
void TPagedBuffer::AppendPage() {
TBufferPage* page = nullptr;
if (Tail_) {
auto tailPage = TBufferPage::GetPage(Tail_);
auto next = tailPage->Next();
if (next) {
page = next;
page->Clear();
} else {
page = TBufferPage::Allocate();
tailPage->Next_ = page;
}
tailPage->Size_ = TailSize_;
ClosedPagesSize_ += TailSize_;
} else {
Y_DEBUG_ABORT_UNLESS(Head_ == nullptr);
page = TBufferPage::Allocate();
Head_ = page->Data();
}
TailSize_ = 0;
Tail_ = page->Data();
}
using NYql::TChunkedBuffer;
TChunkedBuffer TPagedBuffer::AsChunkedBuffer(const TConstPtr& buffer) {
TChunkedBuffer result;
buffer->ForEachPage([&](const char* data, size_t size) {
result.Append(TStringBuf(data, size), buffer);
});
return result;
}
} // NMiniKQL
} // NKikimr
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