zcom4.cpp

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/******************************************************************************
 *
 *  zcom4.cpp - code for class 'zCom4'- a module that reads compressed
 *      commentary files
 *
 * $Id: zcom4.cpp 3821 2020-11-02 18:33:02Z scribe $
 *
 * Copyright 1996-2014 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.
 *
 */

#include <ctype.h>
#include <stdio.h>
#include <fcntl.h>

#include <swbuf.h>
#include <zverse4.h>
#include <versekey.h>
#include <zcom4.h>
#include <filemgr.h>

SWORD_NAMESPACE_START

/******************************************************************************
 * zCom4 Constructor - Initializes data for instance of zCom4
 *
 * ENT: ipath - path to data files
 *      iname - Internal name for module
 *      idesc - Name to display to user for module
 *      iblockType - verse, chapter, book, etc. of index chunks
 *      icomp - Compressor object
 *      idisp - Display object to use for displaying
 */

zCom4::zCom4(const char *ipath, const char *iname, const char *idesc, int iblockType, SWCompress *icomp, SWDisplay *idisp, SWTextEncoding enc, SWTextDirection dir, SWTextMarkup mark, const char *ilang, const char *versification) : zVerse4(ipath, -1, iblockType, icomp), SWCom(iname, idesc, idisp, enc, dir, mark, ilang, versification)/*, SWCompress()*/
{
    blockType = iblockType;
    lastWriteKey = 0;
}

/******************************************************************************
 * zCom4 Destructor - Cleans up instance of zCom4
 */

zCom4::~zCom4() {
    flushCache();

    if (lastWriteKey)
        delete lastWriteKey;
}


bool zCom4::isWritable() const {
    return ((idxfp[0]->getFd() > 0) && ((idxfp[0]->mode & FileMgr::RDWR) == FileMgr::RDWR));
}


/******************************************************************************
 * zCom4::getRawEntry   - Returns the current verse buffer
 *
 * RET: buffer with verse
 */

SWBuf &zCom4::getRawEntryBuf() const {
    long  start = 0;
    unsigned long size = 0;
    unsigned long buffnum = 0;
    const VerseKey &key = getVerseKey();

    findOffset(key.getTestament(), key.getTestamentIndex(), &start, &size, &buffnum);
    entrySize = size;        // support getEntrySize call
              
    entryBuf = "";
    
    zReadText(key.getTestament(), start, size, buffnum, entryBuf);
    rawFilter(entryBuf, &key);

//  if (!isUnicode())
        prepText(entryBuf);

    return entryBuf;
}


bool zCom4::sameBlock(VerseKey *k1, VerseKey *k2) {
    if (k1->getTestament() != k2->getTestament())
        return false;

    switch (blockType) {
    case VERSEBLOCKS:
        if (k1->getVerse() != k2->getVerse())
            return false;
    case CHAPTERBLOCKS:
        if (k1->getChapter() != k2->getChapter())
            return false;
    case BOOKBLOCKS:
        if (k1->getBook() != k2->getBook())
            return false;
    }
    return true;
}

void zCom4::setEntry(const char *inbuf, long len) {
    VerseKey *key = &getVerseKey();

    // see if we've jumped across blocks since last write
    if (lastWriteKey) {
        if (!sameBlock(lastWriteKey, key)) {
            flushCache();
        }
        delete lastWriteKey;
    }

    doSetText(key->getTestament(), key->getTestamentIndex(), inbuf, len);

    lastWriteKey = (VerseKey *)key->clone();    // must delete
}


void zCom4::linkEntry(const SWKey *inkey) {
    VerseKey *destkey = &getVerseKey();
    const VerseKey *srckey = &getVerseKeyConst(inkey);

    doLinkEntry(destkey->getTestament(), destkey->getTestamentIndex(), srckey->getTestamentIndex());

    if (inkey != srckey) // free our key if we created a VerseKey
        delete srckey;
}

/******************************************************************************
 * zCom4::deleteEntry   - deletes this entry
 *
 * RET: *this
 */

void zCom4::deleteEntry() {

    VerseKey *key = &getVerseKey();
    doSetText(key->getTestament(), key->getTestamentIndex(), "");
}


/******************************************************************************
 * zCom4::increment - Increments module key a number of entries
 *
 * ENT: increment   - Number of entries to jump forward
 *
 * RET: *this
 */

void zCom4::increment(int steps) {
    long  start;
    unsigned long size;
    unsigned long buffnum;
    VerseKey *tmpkey = &getVerseKey();

    findOffset(tmpkey->getTestament(), tmpkey->getTestamentIndex(), &start, &size, &buffnum);

    SWKey lastgood = *tmpkey;
    while (steps) {
        long laststart = start;
        unsigned long lastsize = size;
        SWKey lasttry = *tmpkey;
        (steps > 0) ? ++(*key) : --(*key);
        tmpkey = &getVerseKey();

        if ((error = key->popError())) {
            *key = lastgood;
            break;
        }
        long index = tmpkey->getTestamentIndex();
        findOffset(tmpkey->getTestament(), index, &start, &size, &buffnum);
        if (
            (((laststart != start) || (lastsize != size))   // we're a different entry
//              && (start > 0) 
                && (size))  // and we actually have a size
                ||(!skipConsecutiveLinks)) {    // or we don't want to skip consecutive links
            steps += (steps < 0) ? 1 : -1;
            lastgood = *tmpkey;
        }
    }
    error = (error) ? KEYERR_OUTOFBOUNDS : 0;
}

bool zCom4::isLinked(const SWKey *k1, const SWKey *k2) const {
    long start1, start2;
    unsigned long size1, size2;
    unsigned long buffnum1, buffnum2;
    const VerseKey *vk1 = &getVerseKey(k1);
    const VerseKey *vk2 = &getVerseKey(k2);
    if (vk1->getTestament() != vk2->getTestament()) return false;

    findOffset(vk1->getTestament(), vk1->getTestamentIndex(), &start1, &size1, &buffnum1);
    findOffset(vk2->getTestament(), vk2->getTestamentIndex(), &start2, &size2, &buffnum2);
    return start1 == start2 && buffnum1 == buffnum2;
}

bool zCom4::hasEntry(const SWKey *k) const {
    long start;
    unsigned long size;
    unsigned long buffnum;
    const VerseKey *vk = &getVerseKey(k);

    findOffset(vk->getTestament(), vk->getTestamentIndex(), &start, &size, &buffnum);
    return size;
}

SWORD_NAMESPACE_END