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#include "chunked_input_stream.h"
namespace NYT {
////////////////////////////////////////////////////////////////////////////////
TChunkedInputStream::TChunkedInputStream(std::vector<TSharedRef> blocks)
: Blocks_(std::move(blocks))
{ }
size_t TChunkedInputStream::DoNext(const void** ptr, size_t len)
{
SkipCompletedBlocks();
if (Index_ == Blocks_.size()) {
*ptr = nullptr;
return 0;
}
*ptr = Blocks_[Index_].Begin() + Position_;
size_t toSkip = std::min(Blocks_[Index_].Size() - Position_, len);
Position_ += toSkip;
return toSkip;
}
void TChunkedInputStream::SkipCompletedBlocks()
{
while (Index_ < Blocks_.size() && Position_ == Blocks_[Index_].Size()) {
Index_ += 1;
Position_ = 0;
}
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
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