diff options
Diffstat (limited to 'src/lib/krb5/unicode/ucstr.c')
| -rw-r--r-- | src/lib/krb5/unicode/ucstr.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/lib/krb5/unicode/ucstr.c b/src/lib/krb5/unicode/ucstr.c index e3ed9bc64..0257882cd 100644 --- a/src/lib/krb5/unicode/ucstr.c +++ b/src/lib/krb5/unicode/ucstr.c @@ -18,6 +18,7 @@ #include "k5-int.h" #include "k5-utf8.h" #include "k5-unicode.h" +#include "k5-input.h" #include "ucdata/ucdata.h" #include <ctype.h> @@ -100,6 +101,32 @@ krb5int_ucstr2upper( } } +/* Return true if data contains valid UTF-8 sequences. */ +krb5_boolean +k5_utf8_validate(const krb5_data *data) +{ + struct k5input in; + int len, tmplen, i; + const uint8_t *bytes; + + k5_input_init(&in, data->data, data->length); + while (!in.status && in.len > 0) { + len = KRB5_UTF8_CHARLEN(in.ptr); + if (len < 1 || len > 4) + return FALSE; + bytes = k5_input_get_bytes(&in, len); + if (bytes == NULL) + return FALSE; + if (KRB5_UTF8_CHARLEN2(bytes, tmplen) != len) + return FALSE; + for (i = 1; i < len; i++) { + if ((bytes[i] & 0xc0) != 0x80) + return FALSE; + } + } + return !in.status; +} + #define TOUPPER(c) (islower(c) ? toupper(c) : (c)) #define TOLOWER(c) (isupper(c) ? tolower(c) : (c)) |