/* $OpenBSD: a_utf8.c,v 1.9 2022/11/26 16:08:50 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include
#include
#include "asn1_local.h"
/* UTF8 utilities */
/*
* This parses a UTF8 string one character at a time. It is passed a pointer
* to the string and the length of the string. It sets 'value' to the value of
* the current character. It returns the number of characters read or a
* negative error code:
* -1 = string too short
* -2 = illegal character
* -3 = subsequent characters not of the form 10xxxxxx
* -4 = character encoded incorrectly (not minimal length).
*/
int
UTF8_getc(const unsigned char *str, int len, unsigned long *val)
{
const unsigned char *p;
unsigned long value;
int ret;
if (len <= 0)
return 0;
p = str;
/* Check syntax and work out the encoded value (if correct) */
if ((*p & 0x80) == 0) {
value = *p++ & 0x7f;
ret = 1;
} else if ((*p & 0xe0) == 0xc0) {
if (*p < 0xc2)
return -2;
if (len < 2)
return -1;
if ((p[1] & 0xc0) != 0x80)
return -3;
value = (*p++ & 0x1f) << 6;
value |= *p++ & 0x3f;
if (value < 0x80)
return -4;
ret = 2;
} else if ((*p & 0xf0) == 0xe0) {
if (len < 3)
return -1;
if (((p[1] & 0xc0) != 0x80) ||
((p[2] & 0xc0) != 0x80))
return -3;
value = (*p++ & 0xf) << 12;
value |= (*p++ & 0x3f) << 6;
value |= *p++ & 0x3f;
if (value < 0x800)
return -4;
/* surrogate pair code points are not valid */
if (value >= 0xd800 && value < 0xe000)
return -2;
ret = 3;
} else if ((*p & 0xf8) == 0xf0 && (*p < 0xf5)) {
if (len < 4)
return -1;
if (((p[1] & 0xc0) != 0x80) ||
((p[2] & 0xc0) != 0x80) ||
((p[3] & 0xc0) != 0x80))
return -3;
value = ((unsigned long)(*p++ & 0x7)) << 18;
value |= (*p++ & 0x3f) << 12;
value |= (*p++ & 0x3f) << 6;
value |= *p++ & 0x3f;
if (value < 0x10000)
return -4;
if (value > UNICODE_MAX)
return -2;
ret = 4;
} else
return -2;
*val = value;
return ret;
}
/* This takes a Unicode code point 'value' and writes its UTF-8 encoded form
* in 'str' where 'str' is a buffer of at least length 'len'. If 'str'
* is NULL, then nothing is written and just the return code is determined.
* Returns less than zero on error:
* -1 if 'str' is not NULL and 'len' is too small
* -2 if 'value' is an invalid character (surrogate or out-of-range)
*
* Otherwise, returns the number of bytes in 'value's encoded form
* (i.e., the number of bytes written to 'str' when it's not NULL).
*
* It will need at most 4 characters.
*/
int
UTF8_putc(unsigned char *str, int len, unsigned long value)
{
if (value < 0x80) {
if (str != NULL) {
if (len < 1)
return -1;
str[0] = (unsigned char)value;
}
return 1;
}
if (value < 0x800) {
if (str != NULL) {
if (len < 2)
return -1;
str[0] = (unsigned char)(((value >> 6) & 0x1f) | 0xc0);
str[1] = (unsigned char)((value & 0x3f) | 0x80);
}
return 2;
}
if (value < 0x10000) {
if (UNICODE_IS_SURROGATE(value))
return -2;
if (str != NULL) {
if (len < 3)
return -1;
str[0] = (unsigned char)(((value >> 12) & 0xf) | 0xe0);
str[1] = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
str[2] = (unsigned char)((value & 0x3f) | 0x80);
}
return 3;
}
if (value <= UNICODE_MAX) {
if (str != NULL) {
if (len < 4)
return -1;
str[0] = (unsigned char)(((value >> 18) & 0x7) | 0xf0);
str[1] = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
str[2] = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
str[3] = (unsigned char)((value & 0x3f) | 0x80);
}
return 4;
}
return -2;
}