ref: e14d6249749a1101abdad7998e1cd5cdc49e137a
dir: /sys/src/ape/lib/openssl/crypto/asn1/a_utf8.c/
/* crypto/asn1/a_utf8.c */
/* 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 <stdio.h>
#include "cryptlib.h"
#include <openssl/asn1.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(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;
ret = 3;
} else if((*p & 0xf8) == 0xf0) {
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;
ret = 4;
} else if((*p & 0xfc) == 0xf8) {
if(len < 5) return -1;
if( ((p[1] & 0xc0) != 0x80)
|| ((p[2] & 0xc0) != 0x80)
|| ((p[3] & 0xc0) != 0x80)
|| ((p[4] & 0xc0) != 0x80) ) return -3;
value = ((unsigned long)(*p++ & 0x3)) << 24;
value |= ((unsigned long)(*p++ & 0x3f)) << 18;
value |= ((unsigned long)(*p++ & 0x3f)) << 12;
value |= (*p++ & 0x3f) << 6;
value |= *p++ & 0x3f;
if(value < 0x200000) return -4;
ret = 5;
} else if((*p & 0xfe) == 0xfc) {
if(len < 6) return -1;
if( ((p[1] & 0xc0) != 0x80)
|| ((p[2] & 0xc0) != 0x80)
|| ((p[3] & 0xc0) != 0x80)
|| ((p[4] & 0xc0) != 0x80)
|| ((p[5] & 0xc0) != 0x80) ) return -3;
value = ((unsigned long)(*p++ & 0x1)) << 30;
value |= ((unsigned long)(*p++ & 0x3f)) << 24;
value |= ((unsigned long)(*p++ & 0x3f)) << 18;
value |= ((unsigned long)(*p++ & 0x3f)) << 12;
value |= (*p++ & 0x3f) << 6;
value |= *p++ & 0x3f;
if(value < 0x4000000) return -4;
ret = 6;
} else return -2;
*val = value;
return ret;
}
/* This takes a character 'value' and writes the UTF8 encoded value in
* 'str' where 'str' is a buffer containing 'len' characters. Returns
* the number of characters written or -1 if 'len' is too small. 'str' can
* be set to NULL in which case it just returns the number of characters.
* It will need at most 6 characters.
*/
int UTF8_putc(unsigned char *str, int len, unsigned long value)
{
if(!str) len = 6; /* Maximum we will need */
else if(len <= 0) return -1;
if(value < 0x80) {
if(str) *str = (unsigned char)value;
return 1;
}
if(value < 0x800) {
if(len < 2) return -1;
if(str) {
*str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0);
*str = (unsigned char)((value & 0x3f) | 0x80);
}
return 2;
}
if(value < 0x10000) {
if(len < 3) return -1;
if(str) {
*str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0);
*str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
*str = (unsigned char)((value & 0x3f) | 0x80);
}
return 3;
}
if(value < 0x200000) {
if(len < 4) return -1;
if(str) {
*str++ = (unsigned char)(((value >> 18) & 0x7) | 0xf0);
*str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
*str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
*str = (unsigned char)((value & 0x3f) | 0x80);
}
return 4;
}
if(value < 0x4000000) {
if(len < 5) return -1;
if(str) {
*str++ = (unsigned char)(((value >> 24) & 0x3) | 0xf8);
*str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
*str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
*str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
*str = (unsigned char)((value & 0x3f) | 0x80);
}
return 5;
}
if(len < 6) return -1;
if(str) {
*str++ = (unsigned char)(((value >> 30) & 0x1) | 0xfc);
*str++ = (unsigned char)(((value >> 24) & 0x3f) | 0x80);
*str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
*str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
*str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
*str = (unsigned char)((value & 0x3f) | 0x80);
}
return 6;
}