asar coverage - build #205

src/asar/
File: src/asar/unicode.cpp
Date: 2024-02-07 19:18:13
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1 #include "unicode.h"
2
3 1504535 size_t utf8_val(int* codepoint, const char* inp) {
4 1504535 unsigned char c = *inp++;
5 int val;
6
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 1504535 if (c < 0x80) {
7 // plain ascii
8 1503500 *codepoint = c;
9 1503500 return 1u;
10 }
11 // RPG Hacker: Byte sequences starting with 0xC0 or 0xC1 are invalid.
12 // So are byte sequences starting with anything >= 0xF5.
13 // And anything below 0xC0 indicates a follow-up byte and should never be at the start of a sequence.
14
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 1035 else if (c > 0xC1 && c < 0xF5) {
15 // 1, 2 or 3 continuation bytes
16
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 1035 int cont_byte_count = (c >= 0xF0) ? 3 : (c >= 0xE0) ? 2 : 1;
17 // bit hack to extract the significant bits from the start byte
18 1035 val = (c & ((1 << (6 - cont_byte_count)) - 1));
19
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 3006 for (int i = 0; i < cont_byte_count; i++) {
20 1977 unsigned char next = *inp++;
21
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 1977 if ((next & 0xC0) != 0x80) {
22 6 *codepoint = -1;
23 6 return 0u;
24 }
25 1971 val = (val << 6) | (next & 0x3F);
26 }
27 1029 if (// too many cont.bytes
28
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 1029 (*inp & 0xC0) == 0x80 ||
29
30 // invalid codepoints
31
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 1029 val > 0x10FFFF ||
32
33 // check overlong encodings
34
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 1029 (cont_byte_count == 3 && val < 0x1000) ||
35
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 1029 (cont_byte_count == 2 && val < 0x800) ||
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 1029 (cont_byte_count == 1 && val < 0x80) ||
37
38 // UTF16 surrogates
39
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 693 (val >= 0xD800 && val <= 0xDFFF)
40 ) {
41 ✗ *codepoint = -1;
42 ✗ return 0u;
43 };
44 1029 *codepoint = val;
45 1029 return 1u + cont_byte_count;
46 }
47
48 // if none of the above, this couldn't possibly be a valid encoding
49 ✗ *codepoint = -1;
50 ✗ return 0u;
51 }
52
53 31750 bool codepoint_to_utf8(string* out, unsigned int codepoint) {
54 ✗ *out = "";
55
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 31750 if (codepoint < 0x80) {
56 31128 *out += (unsigned char)codepoint;
57 }
58
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 622 else if (codepoint < 0x800) {
59 ✗ *out += (unsigned char)(0xc0 | (codepoint >> 6));
60 ✗ *out += (unsigned char)(0x80 | (codepoint & 0x3f));
61 }
62
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 622 else if (codepoint < 0x10000) {
63 372 *out += (unsigned char)(0xe0 | (codepoint >> 12));
64 372 *out += (unsigned char)(0x80 | ((codepoint >> 6) & 0x3f));
65 372 *out += (unsigned char)(0x80 | (codepoint & 0x3f));
66 }
67
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 250 else if (codepoint < 0x110000) {
68 250 *out += (unsigned char)(0xf0 | (codepoint >> 18));
69 250 *out += (unsigned char)(0x80 | ((codepoint >> 12) & 0x3f));
70 250 *out += (unsigned char)(0x80 | ((codepoint >> 6) & 0x3f));
71 250 *out += (unsigned char)(0x80 | (codepoint & 0x3f));
72 }
73 ✗ else return false;
74
75 ✗ return true;
76 }
77
78 1890 bool is_valid_utf8(const char* inp) {
79
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 656262 while (*inp != '\0') {
80 int codepoint;
81
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 654378 inp += utf8_val(&codepoint, inp);
82
83
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 654378 if (codepoint == -1) return false;
84 }
85
86 964 return true;
87 }
88
89 31750 size_t utf16_val(int* codepoint, const wchar_t* inp)
90 {
91 31750 wchar_t first_word = *inp;
92
93
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 31750 if (first_word <= 0xD800 || first_word >= 0xDFFF)
94 {
95 // Single word
96 31500 *codepoint = first_word;
97 31500 return 1u;
98 }
99
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 250 else if (first_word >= 0xD800 && first_word <= 0xDBFF)
100 {
101 // Start of a surrogate pair
102 250 wchar_t second_word = *(inp + 1);
103
104
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 250 if (second_word >= 0xDC00 && second_word <= 0xDFFF)
105 {
106 250 *codepoint = 0x10000
107 250 + ((int)(first_word - 0xD800) << 10u)
108 250 + ((int)(second_word - 0xDC00));
109 250 return 2u;
110 }
111 }
112
113 // Everything not covered above is considered invalid.
114 ✗ *codepoint = -1;
115 ✗ return 0u;
116 }
117
118 841724 bool codepoint_to_utf16(std::wstring* out, unsigned int codepoint)
119 {
120
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 841724 if (codepoint >= 0x10000 && codepoint <= 0x10FFFF)
121 {
122 39 wchar_t high = (wchar_t)(((codepoint - 0x10000) >> 10) + 0xD800);
123 39 wchar_t low = (wchar_t)(((codepoint - 0x10000) & 0b1111111111) + 0xDC00);
124
125
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 39 *out = std::wstring() + high + low;
126 39 return true;
127 }
128
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 841685 else if (codepoint <= 0xD800 || codepoint >= 0xDFFF)
129 {
130
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 841685 *out = std::wstring() + (wchar_t)codepoint;
131 841685 return true;
132 }
133
134 // Everything not covered above should be considered invalid.
135 ✗ return false;
136 }
137
138
139 1240 bool utf16_to_utf8(string* result, const wchar_t* u16_str)
140 {
141 ✗ *result = "";
142
143 int codepoint;
144 do
145 {
146
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 31750 u16_str += utf16_val(&codepoint, u16_str);
147
148 ✗ string next;
149
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 31750 if (codepoint == -1 || !codepoint_to_utf8(&next, codepoint)) return false;
150
151
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 31750 *result += next;
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 31750 } while (codepoint != 0);
153
154 ✗ return true;
155 }
156
157 18669 bool utf8_to_utf16(std::wstring* result, const char* u8_str)
158 {
159
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 18669 *result = L"";
160
161 int codepoint;
162 do
163 {
164
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 841724 u8_str += utf8_val(&codepoint, u8_str);
165
166 ✗ std::wstring next;
167
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 841724 if (codepoint == -1 || !codepoint_to_utf16(&next, codepoint)) return false;
168
169
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 841724 *result += next;
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 841724 } while (codepoint != 0);
171
172 ✗ return true;
173 }
174