aa <aa@virgin.net> wrote:
Is it OK to include an ANSI file into a UTF-8 file?
What is an ANSI file?
But the answer is obviuos, as long as the ANSI file is to the utf8
conventions the inclusion results in valid utf8.
So is it valid utf8? man utf-8:
<q>
PROPERTIES
The UTF-8 encoding has the following nice properties:
* UCS characters 0x00000000 to 0x0000007f (the classic US-ASCII charac-
ters) are encoded simply as bytes 0x00 to 0x7f (ASCII compatibility).
This means that files and strings which contain only 7-bit ASCII
characters have the same encoding under both ASCII and UTF-8.
* All UCS characters > 0x7f are encoded as a multi-byte sequence con-
sisting only of bytes in the range 0x80 to 0xfd, so no ASCII byte can
appear as part of another character and there are no problems with
e.g. '\0' or '/'.
[...]
* The bytes 0xfe and 0xff are never used in the UTF-8 encoding.
* The first byte of a multi-byte sequence which represents a single
non-ASCII UCS character is always in the range 0xc0 to 0xfd and indi-
cates how long this multi-byte sequence is. All further bytes in a
multi-byte sequence are in the range 0x80 to 0xbf. This allows easy
resynchronization and makes the encoding stateless and robust against
missing bytes.
[...]
ENCODING
The following byte sequences are used to represent a character. The
sequence to be used depends on the UCS code number of the character:
0x00000000 - 0x0000007F:
0xxxxxxx
0x00000080 - 0x000007FF:
110xxxxx 10xxxxxx
0x00000800 - 0x0000FFFF:
1110xxxx 10xxxxxx 10xxxxxx
0x00010000 - 0x001FFFFF:
11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
0x00200000 - 0x03FFFFFF:
111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
0x04000000 - 0x7FFFFFFF:
1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
The xxx bit positions are filled with the bits of the character code
number in binary representation. Only the shortest possible multi-byte
sequence which can represent the code number of the character can be
used.
The UCS code values 0xd800-0xdfff (UTF-16 surrogates) as well as 0xfffe
and 0xffff (UCS non-characters) should not appear in conforming UTF-8
streams.
</q>
But why simply include so it might go wrong (now or in the future), when
you can use the mbstring/iconv functions to correctly convert whatever
is in the the include file to valid utf-8!
--
Daniel Tryba