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1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4  *****************************************************************************
5  *
6  *   Copyright (C) 1998-2016, International Business Machines
7  *   Corporation and others.  All Rights Reserved.
8  *
9  *****************************************************************************
10  *
11  *  ucnv_err.c
12  *  Implements error behaviour functions called by T_UConverter_{from,to}Unicode
13  *
14  *
15 *   Change history:
16 *
17 *   06/29/2000  helena      Major rewrite of the callback APIs.
18 */
19 
20 #include "unicode/utypes.h"
21 
22 #if !UCONFIG_NO_CONVERSION
23 
24 #include "unicode/ucnv_err.h"
25 #include "unicode/ucnv_cb.h"
26 #include "ucnv_cnv.h"
27 #include "cmemory.h"
28 #include "unicode/ucnv.h"
29 #include "ustrfmt.h"
30 
31 #define VALUE_STRING_LENGTH 48
32 /*Magic # 32 = 4(number of char in value string) * 8(max number of bytes per char for any converter) */
33 #define UNICODE_PERCENT_SIGN_CODEPOINT  0x0025
34 #define UNICODE_U_CODEPOINT             0x0055
35 #define UNICODE_X_CODEPOINT             0x0058
36 #define UNICODE_RS_CODEPOINT            0x005C
37 #define UNICODE_U_LOW_CODEPOINT         0x0075
38 #define UNICODE_X_LOW_CODEPOINT         0x0078
39 #define UNICODE_AMP_CODEPOINT           0x0026
40 #define UNICODE_HASH_CODEPOINT          0x0023
41 #define UNICODE_SEMICOLON_CODEPOINT     0x003B
42 #define UNICODE_PLUS_CODEPOINT          0x002B
43 #define UNICODE_LEFT_CURLY_CODEPOINT    0x007B
44 #define UNICODE_RIGHT_CURLY_CODEPOINT   0x007D
45 #define UNICODE_SPACE_CODEPOINT         0x0020
46 #define UCNV_PRV_ESCAPE_ICU         0
47 #define UCNV_PRV_ESCAPE_C           'C'
48 #define UCNV_PRV_ESCAPE_XML_DEC     'D'
49 #define UCNV_PRV_ESCAPE_XML_HEX     'X'
50 #define UCNV_PRV_ESCAPE_JAVA        'J'
51 #define UCNV_PRV_ESCAPE_UNICODE     'U'
52 #define UCNV_PRV_ESCAPE_CSS2        'S'
53 #define UCNV_PRV_STOP_ON_ILLEGAL    'i'
54 
55 /*
56  * IS_DEFAULT_IGNORABLE_CODE_POINT
57  * This is to check if a code point has the default ignorable unicode property.
58  * As such, this list needs to be updated if the ignorable code point list ever
59  * changes.
60  * To avoid dependency on other code, this list is hard coded here.
61  * When an ignorable code point is found and is unmappable, the default callbacks
62  * will ignore them.
63  * For a list of the default ignorable code points, use this link:
64  * https://unicode.org/cldr/utility/list-unicodeset.jsp?a=%5B%3ADI%3A%5D&abb=on&g=&i=
65  *
66  * This list should be sync with the one in CharsetCallback.java
67  */
68 #define IS_DEFAULT_IGNORABLE_CODE_POINT(c) ( \
69     (c == 0x00AD) || \
70     (c == 0x034F) || \
71     (c == 0x061C) || \
72     (c == 0x115F) || \
73     (c == 0x1160) || \
74     (0x17B4 <= c && c <= 0x17B5) || \
75     (0x180B <= c && c <= 0x180E) || \
76     (0x200B <= c && c <= 0x200F) || \
77     (0x202A <= c && c <= 0x202E) || \
78     (0x2060 <= c && c <= 0x206F) || \
79     (c == 0x3164) || \
80     (0xFE00 <= c && c <= 0xFE0F) || \
81     (c == 0xFEFF) || \
82     (c == 0xFFA0) || \
83     (0xFFF0 <= c && c <= 0xFFF8) || \
84     (0x1BCA0 <= c && c <= 0x1BCA3) || \
85     (0x1D173 <= c && c <= 0x1D17A) || \
86     (0xE0000 <= c && c <= 0xE0FFF))
87 
88 
89 /*Function Pointer STOPS at the ILLEGAL_SEQUENCE */
90 U_CAPI void    U_EXPORT2
UCNV_FROM_U_CALLBACK_STOP(const void * context,UConverterFromUnicodeArgs * fromUArgs,const UChar * codeUnits,int32_t length,UChar32 codePoint,UConverterCallbackReason reason,UErrorCode * err)91 UCNV_FROM_U_CALLBACK_STOP (
92                   const void *context,
93                   UConverterFromUnicodeArgs *fromUArgs,
94                   const UChar* codeUnits,
95                   int32_t length,
96                   UChar32 codePoint,
97                   UConverterCallbackReason reason,
98                   UErrorCode * err)
99 {
100     (void)context;
101     (void)fromUArgs;
102     (void)codeUnits;
103     (void)length;
104     if (reason == UCNV_UNASSIGNED && IS_DEFAULT_IGNORABLE_CODE_POINT(codePoint))
105     {
106         /*
107          * Skip if the codepoint has unicode property of default ignorable.
108          */
109         *err = U_ZERO_ERROR;
110     }
111     /* the caller must have set the error code accordingly */
112     return;
113 }
114 
115 
116 /*Function Pointer STOPS at the ILLEGAL_SEQUENCE */
117 U_CAPI void    U_EXPORT2
UCNV_TO_U_CALLBACK_STOP(const void * context,UConverterToUnicodeArgs * toUArgs,const char * codePoints,int32_t length,UConverterCallbackReason reason,UErrorCode * err)118 UCNV_TO_U_CALLBACK_STOP (
119                    const void *context,
120                    UConverterToUnicodeArgs *toUArgs,
121                    const char* codePoints,
122                    int32_t length,
123                    UConverterCallbackReason reason,
124                    UErrorCode * err)
125 {
126     /* the caller must have set the error code accordingly */
127     (void)context; (void)toUArgs; (void)codePoints; (void)length; (void)reason; (void)err;
128     return;
129 }
130 
131 U_CAPI void    U_EXPORT2
UCNV_FROM_U_CALLBACK_SKIP(const void * context,UConverterFromUnicodeArgs * fromUArgs,const UChar * codeUnits,int32_t length,UChar32 codePoint,UConverterCallbackReason reason,UErrorCode * err)132 UCNV_FROM_U_CALLBACK_SKIP (
133                   const void *context,
134                   UConverterFromUnicodeArgs *fromUArgs,
135                   const UChar* codeUnits,
136                   int32_t length,
137                   UChar32 codePoint,
138                   UConverterCallbackReason reason,
139                   UErrorCode * err)
140 {
141     (void)fromUArgs;
142     (void)codeUnits;
143     (void)length;
144     if (reason <= UCNV_IRREGULAR)
145     {
146         if (reason == UCNV_UNASSIGNED && IS_DEFAULT_IGNORABLE_CODE_POINT(codePoint))
147         {
148             /*
149              * Skip if the codepoint has unicode property of default ignorable.
150              */
151             *err = U_ZERO_ERROR;
152         }
153         else if (context == NULL || (*((char*)context) == UCNV_PRV_STOP_ON_ILLEGAL && reason == UCNV_UNASSIGNED))
154         {
155             *err = U_ZERO_ERROR;
156         }
157         /* else the caller must have set the error code accordingly. */
158     }
159     /* else ignore the reset, close and clone calls. */
160 }
161 
162 U_CAPI void    U_EXPORT2
UCNV_FROM_U_CALLBACK_SUBSTITUTE(const void * context,UConverterFromUnicodeArgs * fromArgs,const UChar * codeUnits,int32_t length,UChar32 codePoint,UConverterCallbackReason reason,UErrorCode * err)163 UCNV_FROM_U_CALLBACK_SUBSTITUTE (
164                   const void *context,
165                   UConverterFromUnicodeArgs *fromArgs,
166                   const UChar* codeUnits,
167                   int32_t length,
168                   UChar32 codePoint,
169                   UConverterCallbackReason reason,
170                   UErrorCode * err)
171 {
172     (void)codeUnits;
173     (void)length;
174     if (reason <= UCNV_IRREGULAR)
175     {
176         if (reason == UCNV_UNASSIGNED && IS_DEFAULT_IGNORABLE_CODE_POINT(codePoint))
177         {
178             /*
179              * Skip if the codepoint has unicode property of default ignorable.
180              */
181             *err = U_ZERO_ERROR;
182         }
183         else if (context == NULL || (*((char*)context) == UCNV_PRV_STOP_ON_ILLEGAL && reason == UCNV_UNASSIGNED))
184         {
185             *err = U_ZERO_ERROR;
186             ucnv_cbFromUWriteSub(fromArgs, 0, err);
187         }
188         /* else the caller must have set the error code accordingly. */
189     }
190     /* else ignore the reset, close and clone calls. */
191 }
192 
193 /*uses uprv_itou to get a unicode escape sequence of the offensive sequence,
194  *uses a clean copy (resetted) of the converter, to convert that unicode
195  *escape sequence to the target codepage (if conversion failure happens then
196  *we revert to substituting with subchar)
197  */
198 U_CAPI void    U_EXPORT2
UCNV_FROM_U_CALLBACK_ESCAPE(const void * context,UConverterFromUnicodeArgs * fromArgs,const UChar * codeUnits,int32_t length,UChar32 codePoint,UConverterCallbackReason reason,UErrorCode * err)199 UCNV_FROM_U_CALLBACK_ESCAPE (
200                          const void *context,
201                          UConverterFromUnicodeArgs *fromArgs,
202                          const UChar *codeUnits,
203                          int32_t length,
204                          UChar32 codePoint,
205                          UConverterCallbackReason reason,
206                          UErrorCode * err)
207 {
208 
209   UChar valueString[VALUE_STRING_LENGTH];
210   int32_t valueStringLength = 0;
211   int32_t i = 0;
212 
213   const UChar *myValueSource = NULL;
214   UErrorCode err2 = U_ZERO_ERROR;
215   UConverterFromUCallback original = NULL;
216   const void *originalContext;
217 
218   UConverterFromUCallback ignoredCallback = NULL;
219   const void *ignoredContext;
220 
221   if (reason > UCNV_IRREGULAR)
222   {
223       return;
224   }
225   else if (reason == UCNV_UNASSIGNED && IS_DEFAULT_IGNORABLE_CODE_POINT(codePoint))
226   {
227       /*
228        * Skip if the codepoint has unicode property of default ignorable.
229        */
230       *err = U_ZERO_ERROR;
231       return;
232   }
233 
234   ucnv_setFromUCallBack (fromArgs->converter,
235                      (UConverterFromUCallback) UCNV_FROM_U_CALLBACK_SUBSTITUTE,
236                      NULL,
237                      &original,
238                      &originalContext,
239                      &err2);
240 
241   if (U_FAILURE (err2))
242   {
243     *err = err2;
244     return;
245   }
246   if(context==NULL)
247   {
248       while (i < length)
249       {
250         valueString[valueStringLength++] = (UChar) UNICODE_PERCENT_SIGN_CODEPOINT;  /* adding % */
251         valueString[valueStringLength++] = (UChar) UNICODE_U_CODEPOINT; /* adding U */
252         valueStringLength += uprv_itou (valueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, (uint16_t)codeUnits[i++], 16, 4);
253       }
254   }
255   else
256   {
257       switch(*((char*)context))
258       {
259       case UCNV_PRV_ESCAPE_JAVA:
260           while (i < length)
261           {
262               valueString[valueStringLength++] = (UChar) UNICODE_RS_CODEPOINT;    /* adding \ */
263               valueString[valueStringLength++] = (UChar) UNICODE_U_LOW_CODEPOINT; /* adding u */
264               valueStringLength += uprv_itou (valueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, (uint16_t)codeUnits[i++], 16, 4);
265           }
266           break;
267 
268       case UCNV_PRV_ESCAPE_C:
269           valueString[valueStringLength++] = (UChar) UNICODE_RS_CODEPOINT;    /* adding \ */
270 
271           if(length==2){
272               valueString[valueStringLength++] = (UChar) UNICODE_U_CODEPOINT; /* adding U */
273               valueStringLength += uprv_itou (valueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, codePoint, 16, 8);
274 
275           }
276           else{
277               valueString[valueStringLength++] = (UChar) UNICODE_U_LOW_CODEPOINT; /* adding u */
278               valueStringLength += uprv_itou (valueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, (uint16_t)codeUnits[0], 16, 4);
279           }
280           break;
281 
282       case UCNV_PRV_ESCAPE_XML_DEC:
283 
284           valueString[valueStringLength++] = (UChar) UNICODE_AMP_CODEPOINT;   /* adding & */
285           valueString[valueStringLength++] = (UChar) UNICODE_HASH_CODEPOINT;  /* adding # */
286           if(length==2){
287               valueStringLength += uprv_itou (valueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, codePoint, 10, 0);
288           }
289           else{
290               valueStringLength += uprv_itou (valueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, (uint16_t)codeUnits[0], 10, 0);
291           }
292           valueString[valueStringLength++] = (UChar) UNICODE_SEMICOLON_CODEPOINT; /* adding ; */
293           break;
294 
295       case UCNV_PRV_ESCAPE_XML_HEX:
296 
297           valueString[valueStringLength++] = (UChar) UNICODE_AMP_CODEPOINT;   /* adding & */
298           valueString[valueStringLength++] = (UChar) UNICODE_HASH_CODEPOINT;  /* adding # */
299           valueString[valueStringLength++] = (UChar) UNICODE_X_LOW_CODEPOINT; /* adding x */
300           if(length==2){
301               valueStringLength += uprv_itou (valueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, codePoint, 16, 0);
302           }
303           else{
304               valueStringLength += uprv_itou (valueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, (uint16_t)codeUnits[0], 16, 0);
305           }
306           valueString[valueStringLength++] = (UChar) UNICODE_SEMICOLON_CODEPOINT; /* adding ; */
307           break;
308 
309       case UCNV_PRV_ESCAPE_UNICODE:
310           valueString[valueStringLength++] = (UChar) UNICODE_LEFT_CURLY_CODEPOINT;    /* adding { */
311           valueString[valueStringLength++] = (UChar) UNICODE_U_CODEPOINT;    /* adding U */
312           valueString[valueStringLength++] = (UChar) UNICODE_PLUS_CODEPOINT; /* adding + */
313           if (length == 2) {
314               valueStringLength += uprv_itou (valueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, codePoint, 16, 4);
315           } else {
316               valueStringLength += uprv_itou (valueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, (uint16_t)codeUnits[0], 16, 4);
317           }
318           valueString[valueStringLength++] = (UChar) UNICODE_RIGHT_CURLY_CODEPOINT;    /* adding } */
319           break;
320 
321       case UCNV_PRV_ESCAPE_CSS2:
322           valueString[valueStringLength++] = (UChar) UNICODE_RS_CODEPOINT;    /* adding \ */
323           valueStringLength += uprv_itou (valueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, codePoint, 16, 0);
324           /* Always add space character, becase the next character might be whitespace,
325              which would erroneously be considered the termination of the escape sequence. */
326           valueString[valueStringLength++] = (UChar) UNICODE_SPACE_CODEPOINT;
327           break;
328 
329       default:
330           while (i < length)
331           {
332               valueString[valueStringLength++] = (UChar) UNICODE_PERCENT_SIGN_CODEPOINT;  /* adding % */
333               valueString[valueStringLength++] = (UChar) UNICODE_U_CODEPOINT;             /* adding U */
334               valueStringLength += uprv_itou (valueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, (uint16_t)codeUnits[i++], 16, 4);
335           }
336       }
337   }
338   myValueSource = valueString;
339 
340   /* reset the error */
341   *err = U_ZERO_ERROR;
342 
343   ucnv_cbFromUWriteUChars(fromArgs, &myValueSource, myValueSource+valueStringLength, 0, err);
344 
345   ucnv_setFromUCallBack (fromArgs->converter,
346                          original,
347                          originalContext,
348                          &ignoredCallback,
349                          &ignoredContext,
350                          &err2);
351   if (U_FAILURE (err2))
352   {
353       *err = err2;
354       return;
355   }
356 
357   return;
358 }
359 
360 
361 
362 U_CAPI void  U_EXPORT2
UCNV_TO_U_CALLBACK_SKIP(const void * context,UConverterToUnicodeArgs * toArgs,const char * codeUnits,int32_t length,UConverterCallbackReason reason,UErrorCode * err)363 UCNV_TO_U_CALLBACK_SKIP (
364                  const void *context,
365                  UConverterToUnicodeArgs *toArgs,
366                  const char* codeUnits,
367                  int32_t length,
368                  UConverterCallbackReason reason,
369                  UErrorCode * err)
370 {
371     (void)toArgs;
372     (void)codeUnits;
373     (void)length;
374     if (reason <= UCNV_IRREGULAR)
375     {
376         if (context == NULL || (*((char*)context) == UCNV_PRV_STOP_ON_ILLEGAL && reason == UCNV_UNASSIGNED))
377         {
378             *err = U_ZERO_ERROR;
379         }
380         /* else the caller must have set the error code accordingly. */
381     }
382     /* else ignore the reset, close and clone calls. */
383 }
384 
385 U_CAPI void    U_EXPORT2
UCNV_TO_U_CALLBACK_SUBSTITUTE(const void * context,UConverterToUnicodeArgs * toArgs,const char * codeUnits,int32_t length,UConverterCallbackReason reason,UErrorCode * err)386 UCNV_TO_U_CALLBACK_SUBSTITUTE (
387                  const void *context,
388                  UConverterToUnicodeArgs *toArgs,
389                  const char* codeUnits,
390                  int32_t length,
391                  UConverterCallbackReason reason,
392                  UErrorCode * err)
393 {
394     (void)codeUnits;
395     (void)length;
396     if (reason <= UCNV_IRREGULAR)
397     {
398         if (context == NULL || (*((char*)context) == UCNV_PRV_STOP_ON_ILLEGAL && reason == UCNV_UNASSIGNED))
399         {
400             *err = U_ZERO_ERROR;
401             ucnv_cbToUWriteSub(toArgs,0,err);
402         }
403         /* else the caller must have set the error code accordingly. */
404     }
405     /* else ignore the reset, close and clone calls. */
406 }
407 
408 /*uses uprv_itou to get a unicode escape sequence of the offensive sequence,
409  *and uses that as the substitution sequence
410  */
411 U_CAPI void   U_EXPORT2
UCNV_TO_U_CALLBACK_ESCAPE(const void * context,UConverterToUnicodeArgs * toArgs,const char * codeUnits,int32_t length,UConverterCallbackReason reason,UErrorCode * err)412 UCNV_TO_U_CALLBACK_ESCAPE (
413                  const void *context,
414                  UConverterToUnicodeArgs *toArgs,
415                  const char* codeUnits,
416                  int32_t length,
417                  UConverterCallbackReason reason,
418                  UErrorCode * err)
419 {
420     UChar uniValueString[VALUE_STRING_LENGTH];
421     int32_t valueStringLength = 0;
422     int32_t i = 0;
423 
424     if (reason > UCNV_IRREGULAR)
425     {
426         return;
427     }
428 
429     if(context==NULL)
430     {
431         while (i < length)
432         {
433             uniValueString[valueStringLength++] = (UChar) UNICODE_PERCENT_SIGN_CODEPOINT; /* adding % */
434             uniValueString[valueStringLength++] = (UChar) UNICODE_X_CODEPOINT;    /* adding X */
435             valueStringLength += uprv_itou (uniValueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, (uint8_t) codeUnits[i++], 16, 2);
436         }
437     }
438     else
439     {
440         switch(*((char*)context))
441         {
442         case UCNV_PRV_ESCAPE_XML_DEC:
443             while (i < length)
444             {
445                 uniValueString[valueStringLength++] = (UChar) UNICODE_AMP_CODEPOINT;   /* adding & */
446                 uniValueString[valueStringLength++] = (UChar) UNICODE_HASH_CODEPOINT;  /* adding # */
447                 valueStringLength += uprv_itou (uniValueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, (uint8_t)codeUnits[i++], 10, 0);
448                 uniValueString[valueStringLength++] = (UChar) UNICODE_SEMICOLON_CODEPOINT; /* adding ; */
449             }
450             break;
451 
452         case UCNV_PRV_ESCAPE_XML_HEX:
453             while (i < length)
454             {
455                 uniValueString[valueStringLength++] = (UChar) UNICODE_AMP_CODEPOINT;   /* adding & */
456                 uniValueString[valueStringLength++] = (UChar) UNICODE_HASH_CODEPOINT;  /* adding # */
457                 uniValueString[valueStringLength++] = (UChar) UNICODE_X_LOW_CODEPOINT; /* adding x */
458                 valueStringLength += uprv_itou (uniValueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, (uint8_t)codeUnits[i++], 16, 0);
459                 uniValueString[valueStringLength++] = (UChar) UNICODE_SEMICOLON_CODEPOINT; /* adding ; */
460             }
461             break;
462         case UCNV_PRV_ESCAPE_C:
463             while (i < length)
464             {
465                 uniValueString[valueStringLength++] = (UChar) UNICODE_RS_CODEPOINT;    /* adding \ */
466                 uniValueString[valueStringLength++] = (UChar) UNICODE_X_LOW_CODEPOINT; /* adding x */
467                 valueStringLength += uprv_itou (uniValueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, (uint8_t)codeUnits[i++], 16, 2);
468             }
469             break;
470         default:
471             while (i < length)
472             {
473                 uniValueString[valueStringLength++] = (UChar) UNICODE_PERCENT_SIGN_CODEPOINT; /* adding % */
474                 uniValueString[valueStringLength++] = (UChar) UNICODE_X_CODEPOINT;    /* adding X */
475                 uprv_itou (uniValueString + valueStringLength, VALUE_STRING_LENGTH - valueStringLength, (uint8_t) codeUnits[i++], 16, 2);
476                 valueStringLength += 2;
477             }
478         }
479     }
480     /* reset the error */
481     *err = U_ZERO_ERROR;
482 
483     ucnv_cbToUWriteUChars(toArgs, uniValueString, valueStringLength, 0, err);
484 }
485 
486 #endif
487