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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/data/fileheader.h>
#include <memory>
class FastOS_FileInterface;
namespace search {
/**
* Class that encapsulates a file containing a generic file header, followed by binary data.
*
* After construction the file is positioned at the start of the binary data.
* It's assumed that the file was written using FileSettings::DIRECTIO_ALIGNMENT.
*/
class FileWithHeader {
private:
std::unique_ptr<FastOS_FileInterface> _file;
vespalib::FileHeader _header;
uint64_t _header_len;
uint64_t _file_size;
public:
FileWithHeader(std::unique_ptr<FastOS_FileInterface> file_in);
~FileWithHeader();
FastOS_FileInterface& file() const { return *_file; }
const vespalib::GenericHeader& header() const { return _header; }
uint64_t file_size() const { return _file_size; }
uint64_t data_size() const { return _file_size - _header_len; }
bool valid() const;
void rewind();
void close();
};
}
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