237 lines
8.7 KiB
C
237 lines
8.7 KiB
C
/* crypto/asn1/a_utf8.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/asn1.h>
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/* UTF8 utilities */
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/*-
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* This parses a UTF8 string one character at a time. It is passed a pointer
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* to the string and the length of the string. It sets 'value' to the value of
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* the current character. It returns the number of characters read or a
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* negative error code:
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* -1 = string too short
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* -2 = illegal character
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* -3 = subsequent characters not of the form 10xxxxxx
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* -4 = character encoded incorrectly (not minimal length).
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*/
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int UTF8_getc(const unsigned char *str, int len, unsigned long *val)
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{
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const unsigned char *p;
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unsigned long value;
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int ret;
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if (len <= 0)
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return 0;
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p = str;
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/* Check syntax and work out the encoded value (if correct) */
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if ((*p & 0x80) == 0) {
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value = *p++ & 0x7f;
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ret = 1;
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} else if ((*p & 0xe0) == 0xc0) {
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if (len < 2)
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return -1;
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if ((p[1] & 0xc0) != 0x80)
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return -3;
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value = (*p++ & 0x1f) << 6;
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value |= *p++ & 0x3f;
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if (value < 0x80)
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return -4;
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ret = 2;
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} else if ((*p & 0xf0) == 0xe0) {
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if (len < 3)
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return -1;
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if (((p[1] & 0xc0) != 0x80)
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|| ((p[2] & 0xc0) != 0x80))
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return -3;
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value = (*p++ & 0xf) << 12;
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value |= (*p++ & 0x3f) << 6;
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value |= *p++ & 0x3f;
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if (value < 0x800)
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return -4;
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ret = 3;
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} else if ((*p & 0xf8) == 0xf0) {
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if (len < 4)
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return -1;
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if (((p[1] & 0xc0) != 0x80)
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|| ((p[2] & 0xc0) != 0x80)
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|| ((p[3] & 0xc0) != 0x80))
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return -3;
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value = ((unsigned long)(*p++ & 0x7)) << 18;
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value |= (*p++ & 0x3f) << 12;
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value |= (*p++ & 0x3f) << 6;
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value |= *p++ & 0x3f;
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if (value < 0x10000)
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return -4;
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ret = 4;
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} else if ((*p & 0xfc) == 0xf8) {
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if (len < 5)
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return -1;
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if (((p[1] & 0xc0) != 0x80)
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|| ((p[2] & 0xc0) != 0x80)
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|| ((p[3] & 0xc0) != 0x80)
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|| ((p[4] & 0xc0) != 0x80))
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return -3;
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value = ((unsigned long)(*p++ & 0x3)) << 24;
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value |= ((unsigned long)(*p++ & 0x3f)) << 18;
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value |= ((unsigned long)(*p++ & 0x3f)) << 12;
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value |= (*p++ & 0x3f) << 6;
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value |= *p++ & 0x3f;
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if (value < 0x200000)
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return -4;
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ret = 5;
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} else if ((*p & 0xfe) == 0xfc) {
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if (len < 6)
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return -1;
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if (((p[1] & 0xc0) != 0x80)
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|| ((p[2] & 0xc0) != 0x80)
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|| ((p[3] & 0xc0) != 0x80)
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|| ((p[4] & 0xc0) != 0x80)
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|| ((p[5] & 0xc0) != 0x80))
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return -3;
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value = ((unsigned long)(*p++ & 0x1)) << 30;
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value |= ((unsigned long)(*p++ & 0x3f)) << 24;
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value |= ((unsigned long)(*p++ & 0x3f)) << 18;
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value |= ((unsigned long)(*p++ & 0x3f)) << 12;
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value |= (*p++ & 0x3f) << 6;
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value |= *p++ & 0x3f;
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if (value < 0x4000000)
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return -4;
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ret = 6;
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} else
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return -2;
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*val = value;
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return ret;
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}
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/*
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* This takes a character 'value' and writes the UTF8 encoded value in 'str'
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* where 'str' is a buffer containing 'len' characters. Returns the number of
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* characters written or -1 if 'len' is too small. 'str' can be set to NULL
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* in which case it just returns the number of characters. It will need at
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* most 6 characters.
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*/
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int UTF8_putc(unsigned char *str, int len, unsigned long value)
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{
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if (!str)
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len = 6; /* Maximum we will need */
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else if (len <= 0)
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return -1;
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if (value < 0x80) {
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if (str)
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*str = (unsigned char)value;
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return 1;
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}
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if (value < 0x800) {
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if (len < 2)
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return -1;
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if (str) {
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*str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0);
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*str = (unsigned char)((value & 0x3f) | 0x80);
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}
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return 2;
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}
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if (value < 0x10000) {
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if (len < 3)
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return -1;
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if (str) {
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*str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0);
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*str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
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*str = (unsigned char)((value & 0x3f) | 0x80);
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}
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return 3;
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}
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if (value < 0x200000) {
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if (len < 4)
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return -1;
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if (str) {
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*str++ = (unsigned char)(((value >> 18) & 0x7) | 0xf0);
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*str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
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*str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
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*str = (unsigned char)((value & 0x3f) | 0x80);
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}
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return 4;
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}
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if (value < 0x4000000) {
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if (len < 5)
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return -1;
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if (str) {
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*str++ = (unsigned char)(((value >> 24) & 0x3) | 0xf8);
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*str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
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*str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
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*str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
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*str = (unsigned char)((value & 0x3f) | 0x80);
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}
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return 5;
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}
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if (len < 6)
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return -1;
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if (str) {
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*str++ = (unsigned char)(((value >> 30) & 0x1) | 0xfc);
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*str++ = (unsigned char)(((value >> 24) & 0x3f) | 0x80);
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*str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
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*str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
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*str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
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*str = (unsigned char)((value & 0x3f) | 0x80);
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}
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return 6;
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}
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