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
|
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "config.h"
#ifdef HAVE_JS_JSAPI_H
#include <js/jsapi.h>
#elif HAVE_MOZJS_JSAPI_H
#include <mozjs/jsapi.h>
#else
#include <jsapi.h>
#endif
static int
enc_char(uint8 *utf8Buffer, uint32 ucs4Char)
{
int utf8Length = 1;
if (ucs4Char < 0x80)
{
*utf8Buffer = (uint8)ucs4Char;
}
else
{
int i;
uint32 a = ucs4Char >> 11;
utf8Length = 2;
while(a)
{
a >>= 5;
utf8Length++;
}
i = utf8Length;
while(--i)
{
utf8Buffer[i] = (uint8)((ucs4Char & 0x3F) | 0x80);
ucs4Char >>= 6;
}
*utf8Buffer = (uint8)(0x100 - (1 << (8-utf8Length)) + ucs4Char);
}
return utf8Length;
}
static JSBool
enc_charbuf(const jschar* src, size_t srclen, char* dst, size_t* dstlenp)
{
size_t i;
size_t utf8Len;
size_t dstlen = *dstlenp;
size_t origDstlen = dstlen;
jschar c;
jschar c2;
uint32 v;
uint8 utf8buf[6];
if(!dst)
{
dstlen = origDstlen = (size_t) -1;
}
while(srclen)
{
c = *src++;
srclen--;
if((c >= 0xDC00) && (c <= 0xDFFF)) goto bad_surrogate;
if(c < 0xD800 || c > 0xDBFF)
{
v = c;
}
else
{
if(srclen < 1) goto buffer_too_small;
c2 = *src++;
srclen--;
if ((c2 < 0xDC00) || (c2 > 0xDFFF))
{
c = c2;
goto bad_surrogate;
}
v = ((c - 0xD800) << 10) + (c2 - 0xDC00) + 0x10000;
}
if(v < 0x0080)
{
/* no encoding necessary - performance hack */
if(!dstlen) goto buffer_too_small;
if(dst) *dst++ = (char) v;
utf8Len = 1;
}
else
{
utf8Len = enc_char(utf8buf, v);
if(utf8Len > dstlen) goto buffer_too_small;
if(dst)
{
for (i = 0; i < utf8Len; i++)
{
*dst++ = (char) utf8buf[i];
}
}
}
dstlen -= utf8Len;
}
*dstlenp = (origDstlen - dstlen);
return JS_TRUE;
bad_surrogate:
*dstlenp = (origDstlen - dstlen);
return JS_FALSE;
buffer_too_small:
*dstlenp = (origDstlen - dstlen);
return JS_FALSE;
}
char*
enc_string(JSContext* cx, jsval arg, size_t* buflen)
{
JSString* str = NULL;
jschar* src = NULL;
char* bytes = NULL;
size_t srclen = 0;
size_t byteslen = 0;
str = JS_ValueToString(cx, arg);
if(!str) goto error;
src = JS_GetStringChars(str);
srclen = JS_GetStringLength(str);
if(!enc_charbuf(src, srclen, NULL, &byteslen)) goto error;
bytes = JS_malloc(cx, (byteslen) + 1);
bytes[byteslen] = 0;
if(!enc_charbuf(src, srclen, bytes, &byteslen)) goto error;
if(buflen) *buflen = byteslen;
goto success;
error:
if(bytes != NULL) JS_free(cx, bytes);
bytes = NULL;
success:
return bytes;
}
static uint32
dec_char(const uint8 *utf8Buffer, int utf8Length)
{
uint32 ucs4Char;
uint32 minucs4Char;
/* from Unicode 3.1, non-shortest form is illegal */
static const uint32 minucs4Table[] = {
0x00000080, 0x00000800, 0x0001000, 0x0020000, 0x0400000
};
if (utf8Length == 1)
{
ucs4Char = *utf8Buffer;
}
else
{
ucs4Char = *utf8Buffer++ & ((1<<(7-utf8Length))-1);
minucs4Char = minucs4Table[utf8Length-2];
while(--utf8Length)
{
ucs4Char = ucs4Char<<6 | (*utf8Buffer++ & 0x3F);
}
if(ucs4Char < minucs4Char || ucs4Char == 0xFFFE || ucs4Char == 0xFFFF)
{
ucs4Char = 0xFFFD;
}
}
return ucs4Char;
}
static JSBool
dec_charbuf(const char *src, size_t srclen, jschar *dst, size_t *dstlenp)
{
uint32 v;
size_t offset = 0;
size_t j;
size_t n;
size_t dstlen = *dstlenp;
size_t origDstlen = dstlen;
if(!dst) dstlen = origDstlen = (size_t) -1;
while(srclen)
{
v = (uint8) *src;
n = 1;
if(v & 0x80)
{
while(v & (0x80 >> n))
{
n++;
}
if(n > srclen) goto buffer_too_small;
if(n == 1 || n > 6) goto bad_character;
for(j = 1; j < n; j++)
{
if((src[j] & 0xC0) != 0x80) goto bad_character;
}
v = dec_char((const uint8 *) src, n);
if(v >= 0x10000)
{
v -= 0x10000;
if(v > 0xFFFFF || dstlen < 2)
{
*dstlenp = (origDstlen - dstlen);
return JS_FALSE;
}
if(dstlen < 2) goto buffer_too_small;
if(dst)
{
*dst++ = (jschar)((v >> 10) + 0xD800);
v = (jschar)((v & 0x3FF) + 0xDC00);
}
dstlen--;
}
}
if(!dstlen) goto buffer_too_small;
if(dst) *dst++ = (jschar) v;
dstlen--;
offset += n;
src += n;
srclen -= n;
}
*dstlenp = (origDstlen - dstlen);
return JS_TRUE;
bad_character:
*dstlenp = (origDstlen - dstlen);
return JS_FALSE;
buffer_too_small:
*dstlenp = (origDstlen - dstlen);
return JS_FALSE;
}
JSString*
dec_string(JSContext* cx, const char* bytes, size_t byteslen)
{
JSString* str = NULL;
jschar* chars = NULL;
size_t charslen;
if(!dec_charbuf(bytes, byteslen, NULL, &charslen)) goto error;
chars = JS_malloc(cx, (charslen + 1) * sizeof(jschar));
if(!chars) return NULL;
chars[charslen] = 0;
if(!dec_charbuf(bytes, byteslen, chars, &charslen)) goto error;
str = JS_NewUCString(cx, chars, charslen - 1);
if(!str) goto error;
goto success;
error:
if(chars != NULL) JS_free(cx, chars);
str = NULL;
success:
return str;
}
|
