chunked_file.h

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#ifndef ROSBAG_CHUNKED_FILE_H
#define ROSBAG_CHUNKED_FILE_H

#include <ios>
#include <stdint.h>
#include <string>
#include "macros.h"
#include <boost/shared_ptr.hpp>

#include <bzlib.h>

#include "rosbag/stream.h"

namespace rosbag {

class ROSBAG_DECL ChunkedFile
{
    friend class Stream;

public:
    ChunkedFile();
    ~ChunkedFile();

    void openWrite    (std::string const& filename);            
    void openRead     (std::string const& filename);            
    void openReadWrite(std::string const& filename);            

    void close();                                               

    std::string getFileName()          const;                   
    uint64_t    getOffset()            const;                   
    uint32_t    getCompressedBytesIn() const;                   
    bool        isOpen()               const;                   
    bool        good()                 const;                   

    void        setReadMode(CompressionType type);
    void        setWriteMode(CompressionType type);

    // File I/O
    void        write(std::string const& s);
    void        write(void* ptr, size_t size);                          
    void        read(void* ptr, size_t size);                           
    std::string getline();
    bool        truncate(uint64_t length);
    void        seek(uint64_t offset, int origin = std::ios_base::beg); 
    void        decompress(CompressionType compression, uint8_t* dest, unsigned int dest_len, uint8_t* source, unsigned int source_len);
    void        swap(ChunkedFile& other);

private:
    ChunkedFile(const ChunkedFile&);
    ChunkedFile& operator=(const ChunkedFile&);

    void open(std::string const& filename, std::string const& mode);
    void clearUnused();

private:
    std::string filename_;       
    FILE*       file_;           
    uint64_t    offset_;         
    uint64_t    compressed_in_;  
    char*       unused_;         
    int         nUnused_;        

    boost::shared_ptr<StreamFactory> stream_factory_;

    boost::shared_ptr<Stream> read_stream_;
    boost::shared_ptr<Stream> write_stream_;
};

inline void swap(ChunkedFile& a, ChunkedFile& b) {
    a.swap(b);
}

} // namespace rosbag

#endif