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
|
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
* Copyright (C) 2000-2006, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
* ucnv_cb.c:
* External APIs for the ICU's codeset conversion library
* Helena Shih
*
* Modification History:
*
* Date Name Description
* 7/28/2000 srl Implementation
*/
/**
* @name Character Conversion C API
*
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_CONVERSION
#include "unicode/ucnv_cb.h"
#include "ucnv_bld.h"
#include "ucnv_cnv.h"
#include "cmemory.h"
/* need to update the offsets when the target moves. */
/* Note: Recursion may occur in the cb functions, be sure to update the offsets correctly
if you don't use ucnv_cbXXX functions. Make sure you don't use the same callback within
the same call stack if the complexity arises. */
U_CAPI void U_EXPORT2
ucnv_cbFromUWriteBytes (UConverterFromUnicodeArgs *args,
const char* source,
int32_t length,
int32_t offsetIndex,
UErrorCode * err)
{
if(U_FAILURE(*err)) {
return;
}
ucnv_fromUWriteBytes(
args->converter,
source, length,
&args->target, args->targetLimit,
&args->offsets, offsetIndex,
err);
}
U_CAPI void U_EXPORT2
ucnv_cbFromUWriteUChars(UConverterFromUnicodeArgs *args,
const char16_t** source,
const char16_t* sourceLimit,
int32_t offsetIndex,
UErrorCode * err)
{
/*
This is a fun one. Recursion can occur - we're basically going to
just retry shoving data through the same converter. Note, if you got
here through some kind of invalid sequence, you maybe should emit a
reset sequence of some kind and/or call ucnv_reset(). Since this
IS an actual conversion, take care that you've changed the callback
or the data, or you'll get an infinite loop.
Please set the err value to something reasonable before calling
into this.
*/
char *oldTarget;
if(U_FAILURE(*err))
{
return;
}
oldTarget = args->target;
ucnv_fromUnicode(args->converter,
&args->target,
args->targetLimit,
source,
sourceLimit,
nullptr, /* no offsets */
false, /* no flush */
err);
if(args->offsets)
{
while (args->target != oldTarget) /* if it moved at all.. */
{
*(args->offsets)++ = offsetIndex;
oldTarget++;
}
}
/*
Note, if you did something like used a Stop subcallback, things would get interesting.
In fact, here's where we want to return the partially consumed in-source!
*/
if(*err == U_BUFFER_OVERFLOW_ERROR)
/* && (*source < sourceLimit && args->target >= args->targetLimit)
-- S. Hrcek */
{
/* Overflowed the target. Now, we'll write into the charErrorBuffer.
It's a fixed size. If we overflow it... Hmm */
char *newTarget;
const char *newTargetLimit;
UErrorCode err2 = U_ZERO_ERROR;
int8_t errBuffLen;
errBuffLen = args->converter->charErrorBufferLength;
/* start the new target at the first free slot in the errbuff.. */
newTarget = (char *)(args->converter->charErrorBuffer + errBuffLen);
newTargetLimit = (char *)(args->converter->charErrorBuffer +
sizeof(args->converter->charErrorBuffer));
if(newTarget >= newTargetLimit)
{
*err = U_INTERNAL_PROGRAM_ERROR;
return;
}
/* We're going to tell the converter that the errbuff len is empty.
This prevents the existing errbuff from being 'flushed' out onto
itself. If the errbuff is needed by the converter this time,
we're hosed - we're out of space! */
args->converter->charErrorBufferLength = 0;
ucnv_fromUnicode(args->converter,
&newTarget,
newTargetLimit,
source,
sourceLimit,
nullptr,
false,
&err2);
/* We can go ahead and overwrite the length here. We know just how
to recalculate it. */
args->converter->charErrorBufferLength = (int8_t)(
newTarget - (char*)args->converter->charErrorBuffer);
if((newTarget >= newTargetLimit) || (err2 == U_BUFFER_OVERFLOW_ERROR))
{
/* now we're REALLY in trouble.
Internal program error - callback shouldn't have written this much
data!
*/
*err = U_INTERNAL_PROGRAM_ERROR;
return;
}
/*else {*/
/* sub errs could be invalid/truncated/illegal chars or w/e.
These might want to be passed on up.. But the problem is, we already
need to pass U_BUFFER_OVERFLOW_ERROR. That has to override these
other errs.. */
/*
if(U_FAILURE(err2))
??
*/
/*}*/
}
}
U_CAPI void U_EXPORT2
ucnv_cbFromUWriteSub (UConverterFromUnicodeArgs *args,
int32_t offsetIndex,
UErrorCode * err)
{
UConverter *converter;
int32_t length;
if(U_FAILURE(*err)) {
return;
}
converter = args->converter;
length = converter->subCharLen;
if(length == 0) {
return;
}
if(length < 0) {
/*
* Write/convert the substitution string. Its real length is -length.
* Unlike the escape callback, we need not change the converter's
* callback function because ucnv_setSubstString() verified that
* the string can be converted, so we will not get a conversion error
* and will not recurse.
* At worst we should get a U_BUFFER_OVERFLOW_ERROR.
*/
const char16_t *source = (const char16_t *)converter->subChars;
ucnv_cbFromUWriteUChars(args, &source, source - length, offsetIndex, err);
return;
}
if(converter->sharedData->impl->writeSub!=nullptr) {
converter->sharedData->impl->writeSub(args, offsetIndex, err);
}
else if(converter->subChar1!=0 && (uint16_t)converter->invalidUCharBuffer[0]<=(uint16_t)0xffu) {
/*
TODO: Is this untestable because the MBCS converter has a writeSub function to call
and the other converters don't use subChar1?
*/
ucnv_cbFromUWriteBytes(args,
(const char *)&converter->subChar1, 1,
offsetIndex, err);
}
else {
ucnv_cbFromUWriteBytes(args,
(const char *)converter->subChars, length,
offsetIndex, err);
}
}
U_CAPI void U_EXPORT2
ucnv_cbToUWriteUChars (UConverterToUnicodeArgs *args,
const char16_t* source,
int32_t length,
int32_t offsetIndex,
UErrorCode * err)
{
if(U_FAILURE(*err)) {
return;
}
ucnv_toUWriteUChars(
args->converter,
source, length,
&args->target, args->targetLimit,
&args->offsets, offsetIndex,
err);
}
U_CAPI void U_EXPORT2
ucnv_cbToUWriteSub (UConverterToUnicodeArgs *args,
int32_t offsetIndex,
UErrorCode * err)
{
static const char16_t kSubstituteChar1 = 0x1A, kSubstituteChar = 0xFFFD;
/* could optimize this case, just one uchar */
if(args->converter->invalidCharLength == 1 && args->converter->subChar1 != 0) {
ucnv_cbToUWriteUChars(args, &kSubstituteChar1, 1, offsetIndex, err);
} else {
ucnv_cbToUWriteUChars(args, &kSubstituteChar, 1, offsetIndex, err);
}
}
#endif
|
