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check for the minimal encoding length

This commit is contained in:
Lev Walkin 2004-10-02 15:55:07 +00:00
parent 45169132c9
commit edc7d59dbb
2 changed files with 80 additions and 31 deletions
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98
skeletons/UTF8String.c
View File

@ -47,20 +47,56 @@ static int UTF8String_ht[2][16] = {
4, 4, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 6, 6, -1, -1 }
};
static int32_t UTF8String_mv[7] = { 0, 0,
0x00000080,
0x00000800,
0x00010000,
0x00200000,
0x04000000
};
/* Internal aliases for return codes */
#define U8E_TRUNC -1 /* UTF-8 sequence truncated */
#define U8E_ILLSTART -2 /* Illegal UTF-8 sequence start */
#define U8E_NOTCONT -3 /* Continuation expectation failed */
#define U8E_NOTMIN -4 /* Not minimal length encoding */
#define U8E_EINVAL -5 /* Invalid arguments */
int
UTF8String_constraint(asn_TYPE_descriptor_t *td, const void *sptr,
asn_app_consume_bytes_f *app_errlog, void *app_key) {
ssize_t len;
len = UTF8String_length((const UTF8String_t *)sptr, td->name,
app_errlog, app_key);
if(len > 0) len = 0;
return len;
ssize_t len = UTF8String_length((const UTF8String_t *)sptr);
switch(len) {
case U8E_EINVAL:
_ASN_ERRLOG(app_errlog, app_key,
"%s: value not given", td->name);
break;
case U8E_TRUNC:
_ASN_ERRLOG(app_errlog, app_key,
"%s: truncated UTF-8 sequence (%s:%d)",
td->name, __FILE__, __LINE__);
break;
case U8E_ILLSTART:
_ASN_ERRLOG(app_errlog, app_key,
"%s: UTF-8 illegal start of encoding (%s:%d)",
td->name, __FILE__, __LINE__);
break;
case U8E_NOTCONT:
_ASN_ERRLOG(app_errlog, app_key,
"%s: UTF-8 not continuation (%s:%d)",
td->name, __FILE__, __LINE__);
break;
case U8E_NOTMIN:
_ASN_ERRLOG(app_errlog, app_key,
"%s: UTF-8 not minimal sequence (%s:%d)",
td->name, __FILE__, __LINE__);
break;
}
return (len < 0) ? -1 : 0;
}
ssize_t
UTF8String_length(const UTF8String_t *st, const char *opt_type_name,
asn_app_consume_bytes_f *app_errlog, void *app_key) {
UTF8String_length(const UTF8String_t *st) {
if(st && st->buf) {
size_t length;
@ -69,35 +105,41 @@ UTF8String_length(const UTF8String_t *st, const char *opt_type_name,
for(length = 0; buf < end; length++) {
int ch = *buf;
int want = UTF8String_ht[0][ch >> 4];
uint8_t *cend;
int32_t value;
int want;
/* Compute the sequence length */
want = UTF8String_ht[0][ch >> 4];
switch(want) {
case -1: /* Second half of the table, long sequence */
case -1:
/* Second half of the table, long sequence */
want = UTF8String_ht[1][ch & 0x0F];
if(want != -1)
break; /* Fine value */
case 0: /* 10xxxxxx should not appear here */
_ASN_ERRLOG(app_errlog, app_key,
"%s: UTF-8 expectation failed "
"at byte %d (%s:%d)",
opt_type_name,
(buf - st->buf) + 1,
__FILE__, __LINE__);
return -1;
if(want != -1) break;
/* Fall through */
case 0:
return U8E_ILLSTART;
}
if(buf + want > end) {
_ASN_ERRLOG(app_errlog, app_key,
"%s: truncated UTF-8 sequence (%s:%d)",
opt_type_name, __FILE__, __LINE__);
return -1;
/* assert(want >= 1 && want <= 6) */
/* Check character sequence length */
if(buf + want > end) return U8E_TRUNC;
value = ch & (0xff >> (want + 1));
cend = buf + want;
for(buf++; buf < cend; buf++) {
ch = *buf;
if(ch < 0x80 || ch > 0xbf) return U8E_NOTCONT;
value = (value << 6) | (ch & 0x3F);
}
buf += want;
if(value < UTF8String_mv[want])
return U8E_NOTMIN;
}
return length;
} else {
_ASN_ERRLOG(app_errlog, app_key,
"%s: value not given", opt_type_name);
return -1;
return U8E_EINVAL;
}
}

13
skeletons/UTF8String.h
View File

@ -14,8 +14,15 @@ extern asn_TYPE_descriptor_t asn_DEF_UTF8String;
asn_struct_print_f UTF8String_print;
asn_constr_check_f UTF8String_constraint;
/* Returns length of UTF-8 string in characters or -1 if error. */
ssize_t UTF8String_length(const UTF8String_t *st, const char *opt_type_name,
asn_app_consume_bytes_f *app_errlog, void *app_key);
/*
* Returns length of the given UTF-8 string in characters,
* or a negative error code:
* -1: UTF-8 sequence truncated
* -2: Illegal UTF-8 sequence start
* -3: Continuation expectation failed
* -4: Not minimal length encoding
* -5: Invalid arguments
*/
ssize_t UTF8String_length(const UTF8String_t *st);
#endif /* _UTF8String_H_ */