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UTF-8, is an Unicode standardized 8-bit variable-width (1-4 Bytes) encoded Charset.
Unicode introduced the term code point, which may be a Character, but a character may consist of multiple code points.

The first 128 code points (0x00 - 0x7F) are US-ASCII compatible, so single Byte (8-bit encoded) ASCII is valid UTF-8 encoding,
if the MSB (0x80) is cleared. All further code points use 2-byte, 3-byte or 4-byte encoding with MSB set and special bit pattern:

  • 0xxxxxxx - 1-byte - 128 code points 8-bit ASCII
  • 110xxxxx 10xxxxxx - 2-byte - 1920 code points covering most Alphabets
  • 1110xxxx 10xxxxxx 10xxxxxx - 3-byte
  • 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx - 4-byte

These patterns make UTF-8 pretty detectable in Network-Protocols which do not use MIME, like IRC.

For more details see the Wikipedia articles above.



Starting with generation x2xx (ie 7270) and fw 4.63 the Webinterface switched to UTF-8 charset. See CONFIG_UTF8.
More details in the Charset article.


Linux filesystem NLS support for UTF-8 was added in fw 4.57 - see nls_utf8.ko.
The Kernel-Config variable enabling it is CONFIG_NLS_UTF8. More details in the NLS article.

Starting with fw 5.55 FRITZ!OS converts all filenames on the NAS to UTF-8 using conv2utf8. See CONFIG_UTF8_FULL.


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