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DecompressInputStream.h

Go to the documentation of this file.

#ifndef CLASSLIB_DECOMPRESS_INPUT_STREAM_H
# define CLASSLIB_DECOMPRESS_INPUT_STREAM_H

//<<<<<< INCLUDES                                                       >>>>>>

# include "classlib/sysapi/system.h"
# include "classlib/iotools/FilterInputStream.h"

namespace lat {
//<<<<<< PUBLIC DEFINES                                                 >>>>>>
//<<<<<< PUBLIC CONSTANTS                                               >>>>>>
//<<<<<< PUBLIC TYPES                                                   >>>>>>

class Decompressor;
class Checksum;
class InputStream;

//<<<<<< PUBLIC VARIABLES                                               >>>>>>
//<<<<<< PUBLIC FUNCTIONS                                               >>>>>>
//<<<<<< CLASS DECLARATIONS                                             >>>>>>

class DecompressInputStream : public FilterInputStream
{
public:
    enum { DEFAULT_BUF_SIZE = 4096 };

    DecompressInputStream (Decompressor *decompressor,
                           Checksum     *checksum,
                           InputStream  *input,
                           IOSize       bufsize = DEFAULT_BUF_SIZE);
    ~DecompressInputStream (void);

    using FilterInputStream::read;
    virtual IOSize      available (void);
    virtual IOSize      read (void *into, IOSize n);
    virtual IOSize      skip (IOSize n);

    // virtual void     reset (void); // FIXME: reset engine, buffers?
    virtual void        close (void);

    virtual unsigned    checksum (void) const;

protected:
    virtual IOSize      fill (void *buffer, IOSize length);

    Decompressor        *m_decompressor;//< Decompression engine
    Checksum            *m_checksum;    //< Checksum of uncompressed data
    unsigned char       *m_buffer;      //< Decompression buffer
    IOSize              m_size;         //< Decompression buffer size
    IOSize              m_last;         //< Amount of input now in m_buffer

private:
    void                unread (void);

    // undefined, no semantics
    DecompressInputStream (const DecompressInputStream &);
    DecompressInputStream &operator= (const DecompressInputStream &);
};

//<<<<<< INLINE PUBLIC FUNCTIONS                                        >>>>>>
//<<<<<< INLINE MEMBER FUNCTIONS                                        >>>>>>

} // namespace lat
#endif // CLASSLIB_DECOMPRESS_INPUT_STREAM_H

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