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#ifndef UTIL_STREAM_STREAM__
#define UTIL_STREAM_STREAM__
#include "util/stream/chain.hh"
#include <boost/noncopyable.hpp>
#include <assert.h>
#include <stdint.h>
namespace util {
namespace stream {
class Stream : boost::noncopyable {
public:
Stream() : current_(NULL), end_(NULL) {}
void Init(const ChainPosition &position) {
entry_size_ = position.GetChain().EntrySize();
block_size_ = position.GetChain().BlockSize();
block_it_.Init(position);
StartBlock();
}
explicit Stream(const ChainPosition &position) {
Init(position);
}
operator bool() const { return current_ != NULL; }
bool operator!() const { return current_ == NULL; }
const void *Get() const { return current_; }
void *Get() { return current_; }
void Poison() {
block_it_->SetValidSize(current_ - static_cast<uint8_t*>(block_it_->Get()));
++block_it_;
block_it_.Poison();
}
Stream &operator++() {
assert(*this);
assert(current_ < end_);
current_ += entry_size_;
if (current_ == end_) {
++block_it_;
StartBlock();
}
return *this;
}
private:
void StartBlock() {
for (; block_it_ && !block_it_->ValidSize(); ++block_it_) {}
current_ = static_cast<uint8_t*>(block_it_->Get());
end_ = current_ + block_it_->ValidSize();
}
uint8_t *current_, *end_;
std::size_t entry_size_;
std::size_t block_size_;
Link block_it_;
};
inline Chain &operator>>(Chain &chain, Stream &stream) {
stream.Init(chain.Add());
return chain;
}
} // namespace stream
} // namespace util
#endif // UTIL_STREAM_STREAM__
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