...
- Insert a replacement character (e.g. "?" the wild card character)
- Ignore the bytes.
- Interpret the bytes according to a different character encoding (often the ISO-8859-1 character map)
- Not notice and decode as if the bytes were some similar bit of UTF-8.
- Stop decoding and report an error
| Wiki Markup |
|---|
The following function from \[[Viega 03|AA. C References#Viega 03]\] will detect illegal character sequences in a string. It returns {{1}} if the string is comprised only of legitimate sequences, else it returns {{0}}: |
| Code Block |
|---|
int spc_utf8_isvalid(const unsigned char *input) {
int nb;
const unsigned char *c = input;
for (c = input; *c; c += (nb + 1)) {
if (!(*c & 0x80)) nb = 0;
else if ((*c & 0xc0) = = 0x80) return 0;
else if ((*c & 0xe0) = = 0xc0) nb = 1;
else if ((*c & 0xf0) = = 0xe0) nb = 2;
else if ((*c & 0xf8) = = 0xf0) nb = 3;
else if ((*c & 0xfc) = = 0xf8) nb = 4;
else if ((*c & 0xfe) = = 0xfc) nb = 5;
while (nb-- > 0)
if ((*(c + nb) & 0xc0) != 0x80) return 0;
}
return 1;
}
|
...