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Supplementary Plane characters can exist in UTF-16 files, but they are not valid UCS-2 characters. For example, refer to this python interpreter code: >>> import codecs >>> codecs.encode(u'\U00010300', 'utf-16') '\xff\xfe\x00\xd8\x00\xdf' Therefore the UCS-4 0x00010300 character is encoded as two 16-bit numbers (0xd800 0xdf00) in a little endian UTF-16 file. For more information, see: http://en.wikipedia.org/wiki/UTF-16#U.2B10000_to_U.2B10FFFF This means that our current BaseTools code could be allowing unsupported UTF-16 characters be used. To fix this, we decode the file using python's utf-16 decode support. Then we verify that each character's code point is 0xffff or less. v3: * Based on Mike Kinney's feedback, we now read the whole file and verify up-front that it contains valid UCS-2 characters. Thanks also to Laszlo Ersek for pointing out the Supplementary Plane characters. v4: * Reject code points in 0xd800-0xdfff range since they are reserved for UTF-16 surrogate pairs. (lersek) Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Yingke Liu <yingke.d.liu@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17694 6f19259b-4bc3-4df7-8a09-765794883524