Method openExisting

crengine/src/lvtinydom.cpp:8591–8622

open existing cache file stream

    /// open existing cache file stream
    LVStreamRef openExisting( lString16 filename, lUInt32 crc, lUInt32 docFlags )
    {
        lString16 fn = makeFileName( filename, crc, docFlags );
        CRLog::debug("ldomDocCache::openExisting(%s)", LCSTR(fn));
        LVStreamRef res;
        if ( findFileIndex( fn ) < 0 ) {
            CRLog::error( "ldomDocCache::openExisting - File %s is not found in cache index", UnicodeToUtf8(fn).c_str() );
            return res;
        }
        res = LVOpenFileStream( (_cacheDir+fn).c_str(), LVOM_APPEND|LVOM_FLAG_SYNC );
        if ( !res ) {
            CRLog::error( "ldomDocCache::openExisting - File %s is listed in cache index, but cannot be opened", UnicodeToUtf8(fn).c_str() );
            return res;
        }

#if ENABLED_BLOCK_WRITE_CACHE
        res = LVCreateBlockWriteStream( res, WRITE_CACHE_BLOCK_SIZE, WRITE_CACHE_BLOCK_COUNT );
#if TEST_BLOCK_STREAM

        LVStreamRef stream2 = LVOpenFileStream( (_cacheDir+fn+L"_c").c_str(), LVOM_APPEND );
        if ( !stream2 ) {
            CRLog::error( "ldomDocCache::createNew - file %s is cannot be created", UnicodeToUtf8(fn).c_str() );
            return stream2;
        }
        res = LVCreateCompareTestStream(res, stream2);
#endif
#endif

        lUInt32 fileSize = (lUInt32) res->GetSize();
        moveFileToTop( fn, fileSize );
        return res;
    }

    /// create new cache file
    LVStreamRef createNew( lString16 filename, lUInt32 crc, lUInt32 docFlags, lUInt32 fileSize )