+unsigned long EmbeddedFile::checksum() const
+{
+ return availableFile().checksum();
+}
+
+/**
+Under the lyx temp directory, content.lyx and its embedded files are usually
+saved as
+
+$temp/$embDirName/file.lyx
+$temp/$embDirName/figure1.png for ./figure1.png)
+$temp/$embDirName/sub/figure2.png for ./sub/figure2.png)
+
+This works fine for embedded files that are in the current or deeper directory
+of the document directory, but not for files such as ../figures/figure.png.
+A unique name $upDirName is chosen to represent .. in such filenames so that
+'up' directories can be stored 'down' the directory tree:
+
+$temp/$embDirName/$upDirName/figures/figure.png for ../figures/figure.png
+$temp/$embDirName/$upDirName/$upDirName/figure.png for ../../figure.png
+
+This name has to be fixed because it is used in lyx bundled .zip file.
+
+Using a similar trick, we use $absDirName for absolute path so that
+an absolute filename can be saved as
+
+$temp/$embDirName/$absDirName/a/absolute/path for /a/absolute/path
+
+FIXME:
+embDirName is set to . so that embedded layout and class files can be
+used directly. However, putting all embedded files directly under
+the temp directory may lead to file conflicts. For example, if a user
+embeds a file blah.log in blah.lyx, it will be replaced when
+'latex blah.tex' is called.
+*/
+const std::string embDirName = ".";
+const std::string upDirName = "LyX.Embed.Dir.Up";
+const std::string absDirName = "LyX.Embed.Dir.Abs";
+const std::string driveName = "LyX.Embed.Drive";
+const std::string spaceName = "LyX.Embed.Space";
+
+std::string EmbeddedFile::calcInzipName(std::string const & buffer_path)
+{
+ string inzipName = to_utf8(makeRelPath(from_utf8(absFilename()),
+ from_utf8(buffer_path)));
+
+ if (FileName(inzipName).isAbsolute())
+ inzipName = absDirName + '/' + inzipName;
+
+ // replace .. by upDirName
+ if (prefixIs(inzipName, "."))
+ inzipName = subst(inzipName, "..", upDirName);
+ // replace special characters by their value
+ inzipName = subst(inzipName, ":", driveName);
+ inzipName = subst(inzipName, " ", spaceName);
+
+ // to avoid name conflict between $docu_path/file and $temp_path/file
+ // embedded files are in a subdirectory of $temp_path.
+ inzipName = embDirName + '/' + inzipName;
+ return inzipName;