C++ FileName::checksum方法代码示例

bool ConverterCache::inCache(FileName const & orig_from,
		string const & to_format) const
{
	if (!lyxrc.use_converter_cache || orig_from.empty())
		return false;
	LYXERR(Debug::FILES, orig_from << ' ' << to_format);

	CacheItem * const item = pimpl_->find(orig_from, to_format);
	if (!item) {
		LYXERR(Debug::FILES, "not in cache.");
		return false;
	}
	time_t const timestamp = orig_from.lastModified();
	if (item->timestamp == timestamp) {
		LYXERR(Debug::FILES, "identical timestamp.");
		return true;
	}
	if (item->checksum == orig_from.checksum()) {
		item->timestamp = timestamp;
		LYXERR(Debug::FILES, "identical checksum.");
		return true;
	}
	LYXERR(Debug::FILES, "in cache, but too old.");
	return false;
}

/** copy file \p sourceFile to \p destFile. If \p force is false, the user
 *  will be asked before existing files are overwritten. If \p only_tmp
 *  is true, then only copy files that are in our tmp dir (to avoid other files
 *  overwriting themselves).
 *  \return
 *  - SUCCESS if this file got copied
 *  - FORCE   if subsequent calls should not ask for confirmation before
 *            overwriting files anymore.
 *  - CANCEL  if the export should be cancelled
 */
CopyStatus copyFile(string const & format,
		    FileName const & sourceFile, FileName const & destFile,
		    string const & latexFile, bool force, bool only_tmp)
{
	CopyStatus ret = force ? FORCE : SUCCESS;

	// This check could be changed to
	// boost::filesystem::equivalent(sourceFile, destFile) if export to
	// other directories than the document directory is desired.
	// Also don't overwrite files that already exist and are identical
	// to the source files.
	if ((only_tmp && !prefixIs(onlyPath(sourceFile.absFileName()), package().temp_dir().absFileName()))
	    || sourceFile.checksum() == destFile.checksum())
		return ret;

	if (!force) {
		switch(checkOverwrite(destFile)) {
		case 0:
			return SUCCESS;
		case 1:
			ret = SUCCESS;
			break;
		case 2:
			ret = FORCE;
			break;
		default:
			return CANCEL;
		}
	}

	Mover const & mover = getMover(format);
	if (!mover.copy(sourceFile, destFile, latexFile))
		Alert::error(_("Couldn't copy file"),
			     bformat(_("Copying %1$s to %2$s failed."),
				     makeDisplayPath(sourceFile.absFileName()),
				     makeDisplayPath(destFile.absFileName())));

	return ret;
}

void ConverterCache::add(FileName const & orig_from, string const & to_format,
		FileName const & converted_file) const
{
	if (!lyxrc.use_converter_cache || orig_from.empty() ||
	    converted_file.empty())
		return;
	LYXERR(Debug::FILES, ' ' << orig_from
			     << ' ' << to_format << ' ' << converted_file);

	// FIXME: Should not hardcode this (see bug 3819 for details)
	if (to_format == "pstex") {
		FileName const converted_eps(changeExtension(converted_file.absFileName(), "eps"));
		add(orig_from, "eps", converted_eps);
	} else if (to_format == "pdftex") {
		FileName const converted_pdf(changeExtension(converted_file.absFileName(), "pdf"));
		add(orig_from, "pdf", converted_pdf);
	}

	// Is the file in the cache already?
	CacheItem * item = pimpl_->find(orig_from, to_format);

	time_t const timestamp = orig_from.lastModified();
	Mover const & mover = getMover(to_format);
	if (item) {
		LYXERR(Debug::FILES, "ConverterCache::add(" << orig_from << "):\n"
					"The file is already in the cache.");
		// First test for timestamp
		if (timestamp == item->timestamp) {
			LYXERR(Debug::FILES, "Same timestamp.");
			return;
		}
		// Maybe the contents is still the same?
		item->timestamp = timestamp;
		unsigned long const checksum = orig_from.checksum();
		if (checksum == item->checksum) {
			LYXERR(Debug::FILES, "Same checksum.");
			return;
		}
		item->checksum = checksum;
		if (!mover.copy(converted_file, item->cache_name,
		              onlyFileName(item->cache_name.absFileName()))) {
			LYXERR(Debug::FILES, "Could not copy file " << orig_from << " to "
				<< item->cache_name);
		} else if (!item->cache_name.changePermission(0600)) {
			LYXERR(Debug::FILES, "Could not change file mode"
				<< item->cache_name);
		}
	} else {
		CacheItem new_item(orig_from, to_format, timestamp,
				orig_from.checksum());
		if (mover.copy(converted_file, new_item.cache_name,
		              onlyFileName(new_item.cache_name.absFileName()))) {
			if (!new_item.cache_name.changePermission(0600)) {
				LYXERR(Debug::FILES, "Could not change file mode"
					<< new_item.cache_name);
			}
			FormatCache & format_cache = pimpl_->cache[orig_from];
			if (format_cache.from_format.empty())
				format_cache.from_format =
					formats.getFormatFromFile(orig_from);
			format_cache.cache[to_format] = new_item;
		} else
			LYXERR(Debug::FILES, "ConverterCache::add(" << orig_from << "):\n"
						"Could not copy file.");
	}
}