/src/openssl30/crypto/asn1/a_utf8.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved. |
3 | | * |
4 | | * Licensed under the Apache License 2.0 (the "License"). You may not use |
5 | | * this file except in compliance with the License. You can obtain a copy |
6 | | * in the file LICENSE in the source distribution or at |
7 | | * https://www.openssl.org/source/license.html |
8 | | */ |
9 | | |
10 | | #include <stdio.h> |
11 | | #include "internal/cryptlib.h" |
12 | | #include "internal/unicode.h" |
13 | | #include <openssl/asn1.h> |
14 | | |
15 | | /* UTF8 utilities */ |
16 | | |
17 | | /*- |
18 | | * This parses a UTF8 string one character at a time. It is passed a pointer |
19 | | * to the string and the length of the string. It sets 'value' to the value of |
20 | | * the current character. It returns the number of characters read or a |
21 | | * negative error code: |
22 | | * -1 = string too short |
23 | | * -2 = illegal character |
24 | | * -3 = subsequent characters not of the form 10xxxxxx |
25 | | * -4 = character encoded incorrectly (not minimal length). |
26 | | */ |
27 | | |
28 | | int UTF8_getc(const unsigned char *str, int len, unsigned long *val) |
29 | 276k | { |
30 | 276k | const unsigned char *p; |
31 | 276k | unsigned long value; |
32 | 276k | int ret; |
33 | 276k | if (len <= 0) |
34 | 0 | return 0; |
35 | 276k | p = str; |
36 | | |
37 | | /* Check syntax and work out the encoded value (if correct) */ |
38 | 276k | if ((*p & 0x80) == 0) { |
39 | 276k | value = *p++ & 0x7f; |
40 | 276k | ret = 1; |
41 | 276k | } else if ((*p & 0xe0) == 0xc0) { |
42 | 30 | if (len < 2) |
43 | 1 | return -1; |
44 | 29 | if ((p[1] & 0xc0) != 0x80) |
45 | 3 | return -3; |
46 | 26 | value = (*p++ & 0x1f) << 6; |
47 | 26 | value |= *p++ & 0x3f; |
48 | 26 | if (value < 0x80) |
49 | 3 | return -4; |
50 | 23 | ret = 2; |
51 | 130 | } else if ((*p & 0xf0) == 0xe0) { |
52 | 62 | if (len < 3) |
53 | 2 | return -1; |
54 | 60 | if (((p[1] & 0xc0) != 0x80) |
55 | 60 | || ((p[2] & 0xc0) != 0x80)) |
56 | 4 | return -3; |
57 | 56 | value = (*p++ & 0xf) << 12; |
58 | 56 | value |= (*p++ & 0x3f) << 6; |
59 | 56 | value |= *p++ & 0x3f; |
60 | 56 | if (value < 0x800) |
61 | 2 | return -4; |
62 | 54 | if (is_unicode_surrogate(value)) |
63 | 3 | return -2; |
64 | 51 | ret = 3; |
65 | 68 | } else if ((*p & 0xf8) == 0xf0) { |
66 | 60 | if (len < 4) |
67 | 3 | return -1; |
68 | 57 | if (((p[1] & 0xc0) != 0x80) |
69 | 57 | || ((p[2] & 0xc0) != 0x80) |
70 | 57 | || ((p[3] & 0xc0) != 0x80)) |
71 | 7 | return -3; |
72 | 50 | value = ((unsigned long)(*p++ & 0x7)) << 18; |
73 | 50 | value |= (*p++ & 0x3f) << 12; |
74 | 50 | value |= (*p++ & 0x3f) << 6; |
75 | 50 | value |= *p++ & 0x3f; |
76 | 50 | if (value < 0x10000) |
77 | 7 | return -4; |
78 | 43 | ret = 4; |
79 | 43 | } else |
80 | 8 | return -2; |
81 | 276k | *val = value; |
82 | 276k | return ret; |
83 | 276k | } |
84 | | |
85 | | /* |
86 | | * This takes a character 'value' and writes the UTF8 encoded value in 'str' |
87 | | * where 'str' is a buffer containing 'len' characters. Returns the number of |
88 | | * characters written, -1 if 'len' is too small or -2 if 'value' is out of |
89 | | * range. 'str' can be set to NULL in which case it just returns the number of |
90 | | * characters. It will need at most 4 characters. |
91 | | */ |
92 | | |
93 | | int UTF8_putc(unsigned char *str, int len, unsigned long value) |
94 | 139k | { |
95 | 139k | if (!str) |
96 | 69.5k | len = 4; /* Maximum we will need */ |
97 | 69.5k | else if (len <= 0) |
98 | 0 | return -1; |
99 | 139k | if (value < 0x80) { |
100 | 138k | if (str) |
101 | 69.2k | *str = (unsigned char)value; |
102 | 138k | return 1; |
103 | 138k | } |
104 | 488 | if (value < 0x800) { |
105 | 170 | if (len < 2) |
106 | 0 | return -1; |
107 | 170 | if (str) { |
108 | 85 | *str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0); |
109 | 85 | *str = (unsigned char)((value & 0x3f) | 0x80); |
110 | 85 | } |
111 | 170 | return 2; |
112 | 170 | } |
113 | 318 | if (value < 0x10000) { |
114 | 216 | if (is_unicode_surrogate(value)) |
115 | 0 | return -2; |
116 | 216 | if (len < 3) |
117 | 0 | return -1; |
118 | 216 | if (str) { |
119 | 108 | *str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0); |
120 | 108 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); |
121 | 108 | *str = (unsigned char)((value & 0x3f) | 0x80); |
122 | 108 | } |
123 | 216 | return 3; |
124 | 216 | } |
125 | 102 | if (value < UNICODE_LIMIT) { |
126 | 102 | if (len < 4) |
127 | 0 | return -1; |
128 | 102 | if (str) { |
129 | 51 | *str++ = (unsigned char)(((value >> 18) & 0x7) | 0xf0); |
130 | 51 | *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80); |
131 | 51 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); |
132 | 51 | *str = (unsigned char)((value & 0x3f) | 0x80); |
133 | 51 | } |
134 | 102 | return 4; |
135 | 102 | } |
136 | 0 | return -2; |
137 | 102 | } |