Hi list,
I'm reading Unicode 6.2.0 and have a question. In Section 2.5, Encoding Forms:
For example, when randomly accessing a string, a program can find the
boundary of a character with limited backup. In UTF-16, if a pointer
points to a leading surrogate, a single backup is required. In
backup in this context refers to moving to previous bytes in order to
find the boundary between the previous, valid character, and the corrupted
character that you have encountered. In other words if you have a string
consisting of N bytes and at byte K you determine that the current sequence
of
All good replies
It means the program needs to go back (a.k.a. back up)
but I'd say backtracking would make for better wording in TUS.
Stephan
Back up here refers to decrementing the pointer in the string.
If you have a string consisting of the following UTF-16 code units, for example:
00C0 0020 20AC D800 DC00 00C5
0 12 3 4 5
If you set the pointer to code unit number 4 (counting from 0), you'll be
The term is probably badly chosen but it means that you must read backward
from the start position.
The term backup is not related to any data copying/saving operation.
- in UTF-16 there's an error in your citation: if you find a leading
surrogate (in 0xD800..0xDBFF), you are already at thecorrct
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