[SOLVED] wrong encode when update pdf meta data using ghostscript and pdfmark

wrong encode when update pdf meta data using ghostscript and pdfmark

I have a base pdf file, and want to update the title into Chinese (UTF-8) using ghostscript and pdfmark, command like below

gs -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile=result.pdf base.pdf pdfmarks

And the pdfmarks file (encoding is UTF-8 without BOM) is below

[ /Title (敏捷开发)
/Author (Larry Cai)
/Producer (xdvipdfmx (0.7.8))
/DOCINFO pdfmark

The command is successfully executed, while when I check the properties of the result.pdf

The title is changed to æŁ‘æ“·å¼•å‘

Please give me hints how to solve this, are there any parameters in gs command or pdfmark?

Solution

The PDF Reference states that the Title entry in the document info dictionary is of type 'text string'. Text strings are defined as using either PDFDocEncoding or UTF-16BE with a Byte Order Mark (see page 158 of the 1.7 PDF Reference Manual).

So you cannot specify a Title using UTF-8 without a BOM.

I would imagine that if you replace the Title string with a string defining the content using UTF-16BE with a BOM then it will work properly. I would suggest you use a hex string rather than a regular PostScript string to specify the data, simply for ease of use.