1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
|
/********************************************************/
/* ntapi: Native API core library */
/* Copyright (C) 2013--2017 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.NTAPI. */
/********************************************************/
#include <psxtypes/psxtypes.h>
#include <ntapi/nt_status.h>
#include <ntapi/nt_unicode.h>
/**
* unofficial bit distribution table for comprehension purposes only
*
* scalar nickname utf-16 utf-8[0] utf-8[1] utf-8[2] utf-8[3]
* ------ -------- -------- -------- -------- -------- --------
* 00000000 7x 00000000 0xxxxxxx
* 0xxxxxxx 0xxxxxxx
*
* 00000yyy 5y6x 00000yyy 110yyyyy 10xxxxxx
* yyxxxxxx yyxxxxxx
*
* zzzzyyyy 4z6y6x zzzzyyyy 1110zzzz 10yyyyyy 10xxxxxx
* yyxxxxxx yyxxxxxx
*
* 000uuuuu 5u4z6y6x 110110ww 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx
* zzzzyyyy wwzzzzyy
* yyxxxxxx 110111yy
* yyxxxxxx (where wwww = uuuuu - 1)
*
*
* validation of utf-8
*
* from to utf-8[0] utf-8[1] utf-8[2] utf-8[3]
* ------ ------ -------- -------- -------- --------
* 0x0000 0x007F 00..7F
* 0x0080 0x07FF C2..DF 80..BF
* 0x0800 0x0FFF E0 A0..BF 80..BF
* 0x1000 0xCFFF E1..EC 80..BF 80..BF
* 0xD000 0xD7FF ED 80..9F 80..BF
* 0xE000 0xFFFF EE..EF 80..BF 80..BF
* 0x10000 0x3FFFF F0 90..BF 80..BF 80..BF
* 0x40000 0xFFFFF F1..F3 80..BF 80..BF 80..BF
* 0x100000 0x10FFFF F4 80..8F 80..BF 80..BF
*
**/
#define __AVAILABLE_CODE_POINTS 0x110000
int __stdcall __ntapi_uc_get_code_point_byte_count_utf8(uint32_t code_point)
{
/* try clearing 7x bits */
if ((code_point >> 7) == 0)
return 1;
/* try clearing 5y + 6x bits */
else if ((code_point >> 11) == 0)
return 2;
/* try clearing 4z +6y + 6x bits */
else if ((code_point >> 16) == 0)
return 3;
/* try clearing 5u + 4z + 6y + 6x bits */
else if ((code_point >> 21) == 0)
return 4;
/* __AVAILABLE_CODE_POINTS exceeded */
else
return 0;
}
int __stdcall __ntapi_uc_get_code_point_byte_count_utf16(uint32_t code_point)
{
/* try clearing 4z +6y + 6x bits */
if ((code_point >> 16) == 0)
return 2;
/* try clearing 5u + 4z + 6y + 6x bits */
else if ((code_point >> 21) == 0)
return 4;
/* __AVAILABLE_CODE_POINTS exceeded */
else
return 0;
}
/**
* following is a straight-forward implementation
* of unicode conversion and validation (see also:
* Table 3-7 of the Unicode Standard, version 6.2).
*
* the use of callbacks allows the validation
* functions to be the basis of our utf-8 conversion
* functions on the one hand, and the posix path arg
* normalization routine on the other.
**/
static int32_t __fastcall __default_callback_fn_utf8(nt_utf8_callback_args * args)
{
args->src += args->byte_count;
return NT_STATUS_SUCCESS;
}
int32_t __stdcall __ntapi_uc_validate_unicode_stream_utf8(
__in const unsigned char * ch,
__in size_t size_in_bytes __optional,
__out size_t * code_points __optional,
__out const unsigned char ** addr_failed __optional,
__in ntapi_uc_utf8_callback_fn ** callback_fn __optional,
__in nt_utf8_callback_args * callback_args __optional)
{
int32_t status;
const unsigned char * utf8;
unsigned char * ch_boundary;
unsigned char byte_count;
size_t _code_points;
ntapi_uc_utf8_callback_fn * _callback_fn[5];
nt_utf8_callback_args _callback_args;
if (!callback_fn) {
_callback_fn[0] = __default_callback_fn_utf8;
_callback_fn[1] = __default_callback_fn_utf8;
_callback_fn[2] = __default_callback_fn_utf8;
_callback_fn[3] = __default_callback_fn_utf8;
_callback_fn[4] = __default_callback_fn_utf8;
callback_fn = (ntapi_uc_utf8_callback_fn **)&_callback_fn;
}
if (!callback_args) {
callback_args = &_callback_args;
callback_args->src = (unsigned char *)0;
}
if (callback_args->src)
ch = callback_args->src;
else
callback_args->src = ch;
if (size_in_bytes)
ch_boundary = (unsigned char *)((uintptr_t)ch + size_in_bytes);
else
ch_boundary = (unsigned char *)(~0);
if (!code_points)
code_points = &_code_points;
while ((ch < ch_boundary) && (*ch)) {
utf8 = ch;
byte_count = 0;
/* try one byte */
if (utf8[0] <= 0x7F)
byte_count = 1;
/* try two bytes */
else if ((++ch < ch_boundary)
&& (utf8[0] >= 0xC2) && (utf8[0] <= 0xDF)
&& (utf8[1] >= 0x80) && (utf8[1] <= 0xBF))
byte_count = 2;
/* try three bytes */
else if ((++ch < ch_boundary)
&& (utf8[0] == 0xE0)
&& (utf8[1] >= 0xA0) && (utf8[1] <= 0xBF)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF))
byte_count = 3;
else if (
(utf8[0] >= 0xE1) && (utf8[0] <= 0xEC)
&& (utf8[1] >= 0x80) && (utf8[1] <= 0xBF)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF))
byte_count = 3;
else if (
(utf8[0] == 0xED)
&& (utf8[1] >= 0x80) && (utf8[1] <= 0x9F)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF))
byte_count = 3;
else if (
(utf8[0] >= 0xEE) && (utf8[0] <= 0xEF)
&& (utf8[1] >= 0x80) && (utf8[1] <= 0xBF)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF))
byte_count = 3;
/* try four bytes */
else if ((++ch < ch_boundary)
&& (utf8[0] == 0xF0)
&& (utf8[1] >= 0x90) && (utf8[1] <= 0xBF)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF)
&& (utf8[3] >= 0x80) && (utf8[3] <= 0xBF))
byte_count = 4;
else if (
(utf8[0] >= 0xF1) && (utf8[0] <= 0xF3)
&& (utf8[1] >= 0x80) && (utf8[1] <= 0xBF)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF)
&& (utf8[3] >= 0x80) && (utf8[3] <= 0xBF))
byte_count = 4;
else if (
(utf8[0] == 0xF4)
&& (utf8[1] >= 0x80) && (utf8[1] <= 0x8F)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF)
&& (utf8[3] >= 0x80) && (utf8[3] <= 0xBF))
byte_count = 4;
if (byte_count) {
(*code_points)++;
callback_args->byte_count = byte_count;
if ((status = callback_fn[byte_count](callback_args)))
return status;
} else {
if (addr_failed)
*addr_failed = (void *)utf8;
return NT_STATUS_ILLEGAL_CHARACTER;
}
/* advance, transcode if needed */
ch = callback_args->src;
}
if ((ch < ch_boundary) && (*ch == 0))
return callback_fn[0](callback_args);
return NT_STATUS_SUCCESS;
}
static int32_t __fastcall __default_callback_fn_utf16(nt_utf16_callback_args * args)
{
if (args->byte_count == 4)
args->src += 2;
else
args->src++;
return NT_STATUS_SUCCESS;
}
int32_t __stdcall __ntapi_uc_validate_unicode_stream_utf16(
__in const wchar16_t * wch,
__in size_t size_in_bytes __optional,
__out size_t * code_points __optional,
__out const wchar16_t ** addr_failed __optional,
__in ntapi_uc_utf16_callback_fn ** callback_fn __optional,
__in nt_utf16_callback_args * callback_args __optional)
{
int32_t status;
const wchar16_t * wch_trail;
wchar16_t * wch_boundary;
unsigned char byte_count;
size_t _code_points;
ntapi_uc_utf16_callback_fn * _callback_fn[5];
nt_utf16_callback_args _callback_args;
if (!callback_fn) {
_callback_fn[0] = __default_callback_fn_utf16;
_callback_fn[1] = __default_callback_fn_utf16;
_callback_fn[2] = __default_callback_fn_utf16;
_callback_fn[3] = __default_callback_fn_utf16;
_callback_fn[4] = __default_callback_fn_utf16;
callback_fn = (ntapi_uc_utf16_callback_fn **)&_callback_fn;
}
if (!callback_args) {
callback_args = &_callback_args;
callback_args->src = (wchar16_t *)0;
}
if (callback_args->src)
wch = callback_args->src;
else
callback_args->src = wch;
if (size_in_bytes)
wch_boundary = (wchar16_t *)((uintptr_t)wch + size_in_bytes);
else
wch_boundary = (wchar16_t *)(~0);
if (!code_points)
code_points = &_code_points;
while ((wch < wch_boundary) && (*wch)) {
byte_count = 0;
/* try one byte */
if (*wch <= 0x7F)
byte_count = 1;
/* try two bytes */
else if (*wch <= 0x7FF)
byte_count = 2;
/* try three bytes */
else if ((*wch < 0xD800) || (*wch >= 0xE000))
byte_count = 3;
/* try four bytes */
else if ((*wch >= 0xD800) && (*wch < 0xDC00)) {
wch_trail = wch + 1;
if ((wch_trail < wch_boundary)
&& (*wch_trail >= 0xDC00)
&& (*wch_trail < 0xE000))
byte_count = 4;
}
if (byte_count) {
(*code_points)++;
callback_args->byte_count = byte_count;
if ((status = callback_fn[byte_count](callback_args)))
return status;
} else {
if (addr_failed)
*addr_failed = (void *)wch;
return NT_STATUS_ILLEGAL_CHARACTER;
}
/* advance, transcode as needed */
wch = callback_args->src;
}
if ((wch < wch_boundary) && (*wch == 0))
return callback_fn[0](callback_args);
return NT_STATUS_SUCCESS;
}
|
