thin-provisioning-tools/thin-provisioning/variable_chunk_stream.h

43 lines
1.1 KiB
C++

#ifndef THIN_PROVISIONING_VARIABLE_CHUNK_STREAM_H
#define THIN_PROVISIONING_VARIABLE_CHUNK_STREAM_H
#include "base/rolling_hash.h"
#include "thin-provisioning/chunk_stream.h"
//----------------------------------------------------------------
namespace thin_provisioning {
class variable_chunk_stream : public chunk_stream {
public:
// window_size must be a power of 2
variable_chunk_stream(chunk_stream &stream, unsigned window_size);
~variable_chunk_stream();
// FIXME: we don't know in advance how many chunks we will have
virtual void rewind();
virtual bool next(bcache::block_address count = 1ull);
virtual bool eof() const;
virtual bcache::block_address index() const;
virtual chunk const &get();
virtual void put(chunk const &c);
private:
bool next_big_chunk();
bool advance_one();
void put_big_chunk();
bcache::block_address index_;
base::content_based_hash h_;
chunk_stream &stream_;
chunk const *big_chunk_;
uint8_t *little_b_, *little_e_, *last_hashed_;
chunk little_chunk_;
};
}
//----------------------------------------------------------------
#endif