---

zstr.h

/*****************************************************************************
 * zstr.h   - code for class 'zStr'- a module that reads compressed text
 *                      files.
 *                      and provides lookup and parsing functions based on
 *                      class StrKey
 *
 * $Id: zstr_8h-source.html,v 1.5 2002/10/31 11:30:16 joachim Exp $
 *
 * Copyright 1998 CrossWire Bible Society (http://www.crosswire.org)
 *      CrossWire Bible Society
 *      P. O. Box 2528
 *      Tempe, AZ  85280-2528
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation version 2.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 */

#ifndef ZSTR_H
#define ZSTR_H

#include <filemgr.h>

#include <defs.h>

SWORD_NAMESPACE_START

class SWCompress;
class EntriesBlock;

class SWDLLEXPORT zStr {

private:
        static int instance;            // number of instantiated zStr objects or derivitives
        EntriesBlock *cacheBlock;
        long cacheBlockIndex;
        bool cacheDirty;
        char *path;
        long lastoff;
        long blockCount;
        SWCompress *compressor;

protected:
        FileDesc *idxfd;
        FileDesc *datfd;
        FileDesc *zdxfd;
        FileDesc *zdtfd;
        static const int IDXENTRYSIZE;
        static const int ZDXENTRYSIZE;

        void getCompressedText(long block, long entry, char **buf);
        void flushCache();
        void prepText(char *buf);
        void getKeyFromDatOffset(long ioffset, char **buf);
        void getKeyFromIdxOffset(long ioffset, char **buf);

public:
        char nl;
        zStr(const char *ipath, int fileMode = -1, long blockCount = 100, SWCompress *icomp = 0);
        virtual ~zStr();
        signed char findKeyIndex(const char *ikey, long *idxoff, long away = 0);
        void getText(long index, char **idxbuf, char **buf);
        void setText(const char *ikey, const char *buf, long len = -1);
        void linkEntry(const char *destkey, const char *srckey);
        virtual void rawZFilter(char *buf, long size, char direction = 0) {}
        static signed char createModule (const char *path);
};

SWORD_NAMESPACE_END
#endif

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