Coverage Report

Created: 2024-04-24 06:23

/src/icu/source/common/ucnv_cb.cpp
Line
Count
Source (jump to first uncovered line)
1
// © 2016 and later: Unicode, Inc. and others.
2
// License & terms of use: http://www.unicode.org/copyright.html
3
/*
4
**********************************************************************
5
*   Copyright (C) 2000-2006, International Business Machines
6
*   Corporation and others.  All Rights Reserved.
7
**********************************************************************
8
 *  ucnv_cb.c:
9
 *  External APIs for the ICU's codeset conversion library
10
 *  Helena Shih
11
 *
12
 * Modification History:
13
 *
14
 *   Date        Name        Description
15
 *   7/28/2000   srl         Implementation
16
 */
17
18
/**
19
 * @name Character Conversion C API
20
 *
21
 */
22
23
#include "unicode/utypes.h"
24
25
#if !UCONFIG_NO_CONVERSION
26
27
#include "unicode/ucnv_cb.h"
28
#include "ucnv_bld.h"
29
#include "ucnv_cnv.h"
30
#include "cmemory.h"
31
32
/* need to update the offsets when the target moves. */
33
/* Note: Recursion may occur in the cb functions, be sure to update the offsets correctly
34
if you don't use ucnv_cbXXX functions.  Make sure you don't use the same callback within
35
the same call stack if the complexity arises. */
36
U_CAPI void  U_EXPORT2
37
ucnv_cbFromUWriteBytes (UConverterFromUnicodeArgs *args,
38
                       const char* source,
39
                       int32_t length,
40
                       int32_t offsetIndex,
41
                       UErrorCode * err)
42
0
{
43
0
    if(U_FAILURE(*err)) {
44
0
        return;
45
0
    }
46
47
0
    ucnv_fromUWriteBytes(
48
0
        args->converter,
49
0
        source, length,
50
0
        &args->target, args->targetLimit,
51
0
        &args->offsets, offsetIndex,
52
0
        err);
53
0
}
54
55
U_CAPI void  U_EXPORT2
56
ucnv_cbFromUWriteUChars(UConverterFromUnicodeArgs *args,
57
                             const UChar** source,
58
                             const UChar*  sourceLimit,
59
                             int32_t offsetIndex,
60
                             UErrorCode * err)
61
0
{
62
    /*
63
    This is a fun one.  Recursion can occur - we're basically going to
64
    just retry shoving data through the same converter. Note, if you got
65
    here through some kind of invalid sequence, you maybe should emit a
66
    reset sequence of some kind and/or call ucnv_reset().  Since this
67
    IS an actual conversion, take care that you've changed the callback
68
    or the data, or you'll get an infinite loop.
69
70
    Please set the err value to something reasonable before calling
71
    into this.
72
    */
73
74
0
    char *oldTarget;
75
76
0
    if(U_FAILURE(*err))
77
0
    {
78
0
        return;
79
0
    }
80
81
0
    oldTarget = args->target;
82
83
0
    ucnv_fromUnicode(args->converter,
84
0
        &args->target,
85
0
        args->targetLimit,
86
0
        source,
87
0
        sourceLimit,
88
0
        NULL, /* no offsets */
89
0
        FALSE, /* no flush */
90
0
        err);
91
92
0
    if(args->offsets)
93
0
    {
94
0
        while (args->target != oldTarget)  /* if it moved at all.. */
95
0
        {
96
0
            *(args->offsets)++ = offsetIndex;
97
0
            oldTarget++;
98
0
        }
99
0
    }
100
101
    /*
102
    Note, if you did something like used a Stop subcallback, things would get interesting.
103
    In fact, here's where we want to return the partially consumed in-source!
104
    */
105
0
    if(*err == U_BUFFER_OVERFLOW_ERROR)
106
    /* && (*source < sourceLimit && args->target >= args->targetLimit)
107
    -- S. Hrcek */
108
0
    {
109
        /* Overflowed the target.  Now, we'll write into the charErrorBuffer.
110
        It's a fixed size. If we overflow it... Hmm */
111
0
        char *newTarget;
112
0
        const char *newTargetLimit;
113
0
        UErrorCode err2 = U_ZERO_ERROR;
114
115
0
        int8_t errBuffLen;
116
117
0
        errBuffLen  = args->converter->charErrorBufferLength;
118
119
        /* start the new target at the first free slot in the errbuff.. */
120
0
        newTarget = (char *)(args->converter->charErrorBuffer + errBuffLen);
121
122
0
        newTargetLimit = (char *)(args->converter->charErrorBuffer +
123
0
            sizeof(args->converter->charErrorBuffer));
124
125
0
        if(newTarget >= newTargetLimit)
126
0
        {
127
0
            *err = U_INTERNAL_PROGRAM_ERROR;
128
0
            return;
129
0
        }
130
131
        /* We're going to tell the converter that the errbuff len is empty.
132
        This prevents the existing errbuff from being 'flushed' out onto
133
        itself.  If the errbuff is needed by the converter this time,
134
        we're hosed - we're out of space! */
135
136
0
        args->converter->charErrorBufferLength = 0;
137
138
0
        ucnv_fromUnicode(args->converter,
139
0
                         &newTarget,
140
0
                         newTargetLimit,
141
0
                         source,
142
0
                         sourceLimit,
143
0
                         NULL,
144
0
                         FALSE,
145
0
                         &err2);
146
147
        /* We can go ahead and overwrite the  length here. We know just how
148
        to recalculate it. */
149
150
0
        args->converter->charErrorBufferLength = (int8_t)(
151
0
            newTarget - (char*)args->converter->charErrorBuffer);
152
153
0
        if((newTarget >= newTargetLimit) || (err2 == U_BUFFER_OVERFLOW_ERROR))
154
0
        {
155
            /* now we're REALLY in trouble.
156
            Internal program error - callback shouldn't have written this much
157
            data!
158
            */
159
0
            *err = U_INTERNAL_PROGRAM_ERROR;
160
0
            return;
161
0
        }
162
        /*else {*/
163
            /* sub errs could be invalid/truncated/illegal chars or w/e.
164
            These might want to be passed on up.. But the problem is, we already
165
            need to pass U_BUFFER_OVERFLOW_ERROR. That has to override these
166
            other errs.. */
167
168
            /*
169
            if(U_FAILURE(err2))
170
            ??
171
            */
172
        /*}*/
173
0
    }
174
0
}
175
176
U_CAPI void  U_EXPORT2
177
ucnv_cbFromUWriteSub (UConverterFromUnicodeArgs *args,
178
                           int32_t offsetIndex,
179
                           UErrorCode * err)
180
0
{
181
0
    UConverter *converter;
182
0
    int32_t length;
183
184
0
    if(U_FAILURE(*err)) {
185
0
        return;
186
0
    }
187
0
    converter = args->converter;
188
0
    length = converter->subCharLen;
189
190
0
    if(length == 0) {
191
0
        return;
192
0
    }
193
194
0
    if(length < 0) {
195
        /*
196
         * Write/convert the substitution string. Its real length is -length.
197
         * Unlike the escape callback, we need not change the converter's
198
         * callback function because ucnv_setSubstString() verified that
199
         * the string can be converted, so we will not get a conversion error
200
         * and will not recurse.
201
         * At worst we should get a U_BUFFER_OVERFLOW_ERROR.
202
         */
203
0
        const UChar *source = (const UChar *)converter->subChars;
204
0
        ucnv_cbFromUWriteUChars(args, &source, source - length, offsetIndex, err);
205
0
        return;
206
0
    }
207
208
0
    if(converter->sharedData->impl->writeSub!=NULL) {
209
0
        converter->sharedData->impl->writeSub(args, offsetIndex, err);
210
0
    }
211
0
    else if(converter->subChar1!=0 && (uint16_t)converter->invalidUCharBuffer[0]<=(uint16_t)0xffu) {
212
        /*
213
        TODO: Is this untestable because the MBCS converter has a writeSub function to call
214
        and the other converters don't use subChar1?
215
        */
216
0
        ucnv_cbFromUWriteBytes(args,
217
0
                               (const char *)&converter->subChar1, 1,
218
0
                               offsetIndex, err);
219
0
    }
220
0
    else {
221
0
        ucnv_cbFromUWriteBytes(args,
222
0
                               (const char *)converter->subChars, length,
223
0
                               offsetIndex, err);
224
0
    }
225
0
}
226
227
U_CAPI void  U_EXPORT2
228
ucnv_cbToUWriteUChars (UConverterToUnicodeArgs *args,
229
                            const UChar* source,
230
                            int32_t length,
231
                            int32_t offsetIndex,
232
                            UErrorCode * err)
233
0
{
234
0
    if(U_FAILURE(*err)) {
235
0
        return;
236
0
    }
237
238
0
    ucnv_toUWriteUChars(
239
0
        args->converter,
240
0
        source, length,
241
0
        &args->target, args->targetLimit,
242
0
        &args->offsets, offsetIndex,
243
0
        err);
244
0
}
245
246
U_CAPI void  U_EXPORT2
247
ucnv_cbToUWriteSub (UConverterToUnicodeArgs *args,
248
                         int32_t offsetIndex,
249
                       UErrorCode * err)
250
0
{
251
0
    static const UChar kSubstituteChar1 = 0x1A, kSubstituteChar = 0xFFFD;
252
253
    /* could optimize this case, just one uchar */
254
0
    if(args->converter->invalidCharLength == 1 && args->converter->subChar1 != 0) {
255
0
        ucnv_cbToUWriteUChars(args, &kSubstituteChar1, 1, offsetIndex, err);
256
0
    } else {
257
0
        ucnv_cbToUWriteUChars(args, &kSubstituteChar, 1, offsetIndex, err);
258
0
    }
259
0
}
260
261
#endif