View source for Notes:Utf8

==Multi-byte characters==
{| class="wikitable" border="1"
|-
! Character representation
! Codepoint encoded
! Data payload
! Real payload
! Char payload
! Caveats
|-
! style="text-align:left;" | {{monospace|0xxx xxxx}}
| style="text-align:right" | {{monospace|0xxx xxxx}}
| 7 bits ~ 128 characters
| 128 characters
| 127 characters
| Excluding the string-termination character, {{C|0000 0000}}
|-
! style="text-align:left;" | {{monospace|110x xxxx 10yy yyyy}}
| style="text-align:right" | {{monospace| 0000 0xxx xxyy yyyy}}
| 11 bits ~ 2048 characters
| 1920 characters
| 1920 characters
| 128 values (lower 7 bits being 0) are lost, as they'd be mapping into the 1-byte code region
|-
! style="text-align:left;" | {{monospace|1110 xxxx 10yy yyyy 10zz zzzz}}
| style="text-align:right" | {{monospace|xxxx yyyy yyzz zzzz}}
| 16 bits ~ 65536 characters
| 63488 characters
| 63488 characters
| Removing the 2048 characters (left most bits all being 0) that would map into the 2 byte or 1 byte ranges.
|-
! style="text-align:left;" | {{monospace|1111 0www 10xx xxxx 10yy yyyy 10zz zzzz}}
| style="text-align:right" | {{monospace|000w wwxx xxxx yyyy yyzz zzzz}}
| 21 bits ~ 2097152 characters
| 2031616 characters
| 2031616 characters
| Removing the 65536 characters which would correspond to the upper 8 bits of the codepoint being 0
|-
! {{M|\sum}}
|
| 2164864 characters (2.16m)
| 2097152 characters (2.1m)
| 2097151 characters (2.1m)
| null byte removed from character payload.
|}
: '''Question: ''' there's a lot of overlap here. This suggests that a first byte of {{C|1100 0000}} is invalid, because that'd overlap with the 1 byte characters! (As opposed to say mapping the 2 bytes in where the 1 bytes end....)  it seems that they map codepoints right to byte representations (using the shortest) rather than maximising the byte representation space. Confirm this.
==Codepoint notation==
A "code point" denotes a Utf8 symbol. We use {{C|U+''n''}}<ref name="U8.0">Unicode 8.0 standard</ref> where {{C|''n''}} is at least 4 characters long, {{C|''n''}} is the ''hexadecimal'' notation of the number of the character. {{C|''n''}} is at most 6 ''hex'' digits long. Examples:
* {{C|U+0001}}, {{C|U+1234}}, {{C|U+12345}}, {{C|U+102345}} ({{C|U+123456}} was not used because it is invalid I guess?)
==Codepoint mapping==
{{C|U+0080}} or {{C|1000 0000}} in binary is the FIRST 2 byte code-point
==Encoding/Decoding==
See table 3.6 in Unicode Specification 8.0 for details. The code points are encoded using the ''smallest'' number of bytes<ref name="U8.0"/><sup>:Table 3.7</sup>

==Special characters and ranges==
The points here are given in 6 digit hex form for text-alignment reasons. 
{| class="wikitable" border="1"
|-
! Codepoint
! Purpose
|-
! style="text-align:left;" | {{monospace|U+000000}}
| null-terminator
|-
! style="text-align:left;" | {{monospace|U+00001F}}
| (legacy character - see<ref name="U8.0"/><sup>:23.1</sup>)
|-
! style="text-align:left;" | {{monospace|U+00007F}}
| (legacy character - see<ref name="U8.0"/><sup>:23.1</sup>)
|-
! style="text-align:left;" | {{monospace|U+000080}}
| rowspan="3" | (legacy character - see<ref name="U8.0"/><sup>:23.1</sup>)
|-
! ...
|-
! style="text-align:left;" | {{monospace|U+00009F}}
|}
There are loads of these....
==References==
<references/>