Method createBlockIndex

src/cceditor/filemanager.cpp:1216–1314

创建大文件编辑模式的索引文件。0 成功，-1取消

//创建大文件编辑模式的索引文件。0 成功，-1取消
int FileManager::createBlockIndex(BigTextEditFileMgr* txtFile)
{
	//每次filePtr 4M的速度进行建块
	qint64 fileSize = txtFile->file->size();

	qint64 curOffset = 0;

	uchar* curPtr = txtFile->filePtr;

	//检测是否为unicode_le编码，要特殊对待。
	//bool isUnLeCode = CmpareMode::isUnicodeLeBomFile(curPtr, 2);

	CODE_ID code = CmpareMode::getTextFileEncodeType(curPtr, fileSize, txtFile->filePath, true);
	txtFile->loadWithCode = code;
	
	const int blockBytes = BigTextEditFileMgr::BLOCK_SIZE * 1024 * 1024;

	int lineEndPos = 0;

	int steps = fileSize / blockBytes;

	txtFile->blocks.reserve(steps + 10);

	ProgressWin* loadFileProcessWin = nullptr;
	
	if (steps > 200)
	{
		loadFileProcessWin = new ProgressWin(nullptr);

		loadFileProcessWin->setWindowModality(Qt::ApplicationModal);

		loadFileProcessWin->info(tr("load bit text file tree in progress\nfile size %1, please wait ...").arg(tranFileSize(fileSize)));

		loadFileProcessWin->setTotalSteps(steps);

		loadFileProcessWin->show();
	}

	quint32 lineNumStart = 0;
	quint32 lineNum = 0;

	while ((curOffset + blockBytes) < fileSize)
	{
		BlockIndex bi;
		bi.fileOffset = curOffset;

		curOffset += blockBytes;

		lineEndPos = findLineEndPos((char*)curPtr+ bi.fileOffset, blockBytes, code);

		bi.fileSize = blockBytes - lineEndPos;

		lineNum = getLineNumInBuf((char*)curPtr + bi.fileOffset, bi.fileSize, code);

		curOffset -= lineEndPos;

		bi.lineNum = lineNum;
		bi.lineNumStart = lineNumStart;