Code units 0xD800 .. 0xDFFF are not UCS-4, so we can't happily return them.
Instead, if we encounter a stray surrogate, replace it with 0xFFFD, which
is what Unicode recommends anyhow.
References:
§3.9 Unicode Encoding Forms
D76: Unicode scalar value: Any Unicode code point except high-surrogate
and low surrogate code points.
As a result of this definition, the set of Unicode scalar values consists
of the ranges 0 to D7FF_16 and E000_16 to 10FFFF_16, inclusive.
[...]
UTF-32 encoding form: The Unicode encoding form that assigns each Unicode
scalar value to a single unsigned 32-bit code unit with the same numeric
value as the Unicode scalar value.
§ C.2 Encoding Forms in ISO/IEC 10646
UCS-4. UCS-4 stands for “Universal Character Set coded in 4 octets.” It is
now treated simply as a synonym for UTF-32, and is considered the canonical
form for representation of characters in 10646.
§ 3.9 Unicode Encoding Forms (Best Practices for Using U+FFFD)
and
§ 5.22 Best Practice for U+FFFD Substitution
Whenever an unconvertible offset is reached during conversion of a code
unit sequence:
1. The maximal subpart at that offset should be replaced by a single
U+FFFD.
2. The conversion should proceed at the offset immediately after the
maximal subpart.
[...]
Whenever an unconvertible offset is reached during conversion of a code
unit sequence to Unicode:
1. Find the longest code unit sequence that is the initial subsequence of
some sequence that could be converted. If there is such a sequence, replace
it with a single U+FFFD; otherwise replace a single code unit with a single
U+FFFD.
2. The conversion should proceed at the offset immediately after the
subsequence which has been replaced.
[ChangeLog][QtCore][QString] QString::toUcs4 now does not return invalid
UCS-4 code units belonging to the surrogate range (U+D800 to U+DFFF)
when the QString contains malformed UTF-16 data. Instead, U+FFFD
is returned in place of the malformed subsequence.
Change-Id: I19d7af03e749fea680fd5d9635439bc9d56558a9
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
bcd1b7fe8e