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ZipInputStream.h

Go to the documentation of this file.

#ifndef CLASSLIB_ZIP_INPUT_STREAM_H
# define CLASSLIB_ZIP_INPUT_STREAM_H

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

# include "classlib/zip/ZInputStream.h"
# include "classlib/zip/ZConstants.h"
# include <vector>
# include <string>

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

class ZipMember;

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

// Reads a zip archive straight off an input stream; central directory
// features are not available in the produced members (file comment,
// global external data) until the whole archive has been read (at
// which points the already seen members will be filled in with the
// global data).
//
// Handle stored and compressed files!
class ZipInputStream : public ZInputStream, public ZConstants
{
public:
    ZipInputStream (InputStream *input);
    ~ZipInputStream (void);

    using ZInputStream::read;

    virtual ZipMember * nextMember (void);
    virtual IOSize      available (void);
    virtual IOSize      read (void *into, IOSize n);
    virtual IOSize      skip (IOSize n);
    virtual void        closeMember (void);

    virtual void        close (void);

    virtual void        reset (void);

    virtual ZipMember * sync (void);

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

private:
    void                resetState (bool destroy);
    unsigned            readHeader (void);
    unsigned            findHeader (void);
    ZipMember *         readMemberHeader (unsigned char *buf, IOSize length);
    void                readDirectory (unsigned char *buf, IOSize length);
    void                readEndHeader (unsigned char *buf, IOSize length);

    typedef std::vector<ZipMember *> MemberList;
    MemberList          m_members;      //< Members read and to be updated
    ZipMember           *m_current;     //< The member that is being read
    IOOffset            m_compressed;   //< Compressed data left to read
    IOOffset            m_uncompressed; //< Uncompressed data left to read
    unsigned            m_magic;        //< Header magic for current state
    std::string         m_comment;      //< Archive comment
    IOOffset            m_total;        //< Total bytes read so far
    IOOffset            m_directory;    //< Position of directory from start
    bool                m_dummy;        //< Indicates when dummy end byte read
};

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

} // namespace lat
#endif // CLASSLIB_ZIP_INPUT_STREAM_H

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