138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
/*
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* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include "internal/unicode.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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if (is_unicode_surrogate(value))
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return -2;
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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
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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, -1 if 'len' is too small or -2 if 'value' is out of
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* range. 'str' can be set to NULL in which case it just returns the number of
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* characters. It will need at most 4 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 = 4; /* 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 (is_unicode_surrogate(value))
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return -2;
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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 < UNICODE_LIMIT) {
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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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return -2;
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}
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