Archive.h

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/*  Project nGenEx
        Destroyer Studios LLC
        Copyright © 1997-2004. All Rights Reserved.

        SUBSYSTEM:    nGenEx.lib
        FILE:         Archive.h
        AUTHOR:       John DiCamillo

*/

#ifndef Archive_h
#define Archive_h

// +------------------------------------------------------------------+

#define VERSION      0x0010
#define BLOCK_SIZE   1024
#define FILE_BLOCK   1024
#define NAMELEN      64

// +------------------------------------------------------------------+

struct DataHeader
{
        static const char* TYPENAME() { return "DataHeader"; }

        DWORD    version;
        DWORD    nfiles;
        DWORD    dir_blocks;
        DWORD    dir_size_comp;
        DWORD    dir_offset;
};

struct DataEntry
{
        static const char* TYPENAME() { return "DataEntry"; }

        char     name[NAMELEN];
        DWORD    size_orig;
        DWORD    size_comp;
        DWORD    offset; 
};

class DataArchive
{
public:
        static const char* TYPENAME() { return "DataArchive"; }

        // ctor:
        DataArchive(const char* name = 0);
        ~DataArchive();

        // operations:
        void     LoadDatafile(const char* name);
        void     Insert(const char* name);
        void     Extract(const char* name);
        void     Remove(const char* name);
        void     List();

        void     WriteEntry(int index, BYTE* buf);
        int      FindEntry(const char* req_name);
        int      ExpandEntry(int index, BYTE*& buf, bool null_terminate=false);
        BYTE*    CompressEntry(int index);
        int      InsertEntry(const char* name);
        void     RemoveEntry(int index);
        DWORD    Blocks(DWORD raw_size);
        DWORD    DirBlocks();
        DWORD    FileBlocks(int index);
        int      FindDataBlocks(int blocks_needed);
        void     CreateBlockMap();

        DWORD    NumFiles() { return header.nfiles; }
        DataEntry* GetFile(int i) { if (i>=0 && i<(int)header.nfiles) return &directory[i]; return 0; }

        const char* Name()   const { return datafile; }

private:
        // persistent data members:
        DataHeader  header;
        DataEntry*  directory;
        BYTE*       dirbuf;

        // transient members:
        char        datafile[NAMELEN];

        DWORD*      block_map;
        DWORD       nblocks;
};

#endif Archive_h