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.c:
12 * Implements APIs for the ICU's codeset conversion library;
13 * mostly calls through internal functions;
14 * created by Bertrand A. Damiba
15 *
16 * Modification History:
17 *
18 * Date Name Description
19 * 04/04/99 helena Fixed internal header inclusion.
20 * 05/09/00 helena Added implementation to handle fallback mappings.
21 * 06/20/2000 helena OS/400 port changes; mostly typecast.
22 */
23
24 #include "unicode/utypes.h"
25
26 #if !UCONFIG_NO_CONVERSION
27
28 #include <memory>
29
30 #include "unicode/ustring.h"
31 #include "unicode/ucnv.h"
32 #include "unicode/ucnv_err.h"
33 #include "unicode/uset.h"
34 #include "unicode/utf.h"
35 #include "unicode/utf16.h"
36 #include "putilimp.h"
37 #include "cmemory.h"
38 #include "cstring.h"
39 #include "uassert.h"
40 #include "utracimp.h"
41 #include "ustr_imp.h"
42 #include "ucnv_imp.h"
43 #include "ucnv_cnv.h"
44 #include "ucnv_bld.h"
45
46 /* size of intermediate and preflighting buffers in ucnv_convert() */
47 #define CHUNK_SIZE 1024
48
49 typedef struct UAmbiguousConverter {
50 const char *name;
51 const char16_t variant5c;
52 } UAmbiguousConverter;
53
54 static const UAmbiguousConverter ambiguousConverters[]={
55 { "ibm-897_P100-1995", 0xa5 },
56 { "ibm-942_P120-1999", 0xa5 },
57 { "ibm-943_P130-1999", 0xa5 },
58 { "ibm-946_P100-1995", 0xa5 },
59 { "ibm-33722_P120-1999", 0xa5 },
60 { "ibm-1041_P100-1995", 0xa5 },
61 /*{ "ibm-54191_P100-2006", 0xa5 },*/
62 /*{ "ibm-62383_P100-2007", 0xa5 },*/
63 /*{ "ibm-891_P100-1995", 0x20a9 },*/
64 { "ibm-944_P100-1995", 0x20a9 },
65 { "ibm-949_P110-1999", 0x20a9 },
66 { "ibm-1363_P110-1997", 0x20a9 },
67 { "ISO_2022,locale=ko,version=0", 0x20a9 },
68 { "ibm-1088_P100-1995", 0x20a9 }
69 };
70
71 /*Calls through createConverter */
72 U_CAPI UConverter* U_EXPORT2
ucnv_open(const char * name,UErrorCode * err)73 ucnv_open (const char *name,
74 UErrorCode * err)
75 {
76 UConverter *r;
77
78 if (err == nullptr || U_FAILURE (*err)) {
79 return nullptr;
80 }
81
82 r = ucnv_createConverter(nullptr, name, err);
83 return r;
84 }
85
86 U_CAPI UConverter* U_EXPORT2
ucnv_openPackage(const char * packageName,const char * converterName,UErrorCode * err)87 ucnv_openPackage (const char *packageName, const char *converterName, UErrorCode * err)
88 {
89 return ucnv_createConverterFromPackage(packageName, converterName, err);
90 }
91
92 /*Extracts the char16_t* to a char* and calls through createConverter */
93 U_CAPI UConverter* U_EXPORT2
ucnv_openU(const char16_t * name,UErrorCode * err)94 ucnv_openU (const char16_t * name,
95 UErrorCode * err)
96 {
97 char asciiName[UCNV_MAX_CONVERTER_NAME_LENGTH];
98
99 if (err == nullptr || U_FAILURE(*err))
100 return nullptr;
101 if (name == nullptr)
102 return ucnv_open (nullptr, err);
103 if (u_strlen(name) >= UCNV_MAX_CONVERTER_NAME_LENGTH)
104 {
105 *err = U_ILLEGAL_ARGUMENT_ERROR;
106 return nullptr;
107 }
108 return ucnv_open(u_austrcpy(asciiName, name), err);
109 }
110
111 /* Copy the string that is represented by the UConverterPlatform enum
112 * @param platformString An output buffer
113 * @param platform An enum representing a platform
114 * @return the length of the copied string.
115 */
116 static int32_t
ucnv_copyPlatformString(char * platformString,UConverterPlatform pltfrm)117 ucnv_copyPlatformString(char *platformString, UConverterPlatform pltfrm)
118 {
119 switch (pltfrm)
120 {
121 case UCNV_IBM:
122 uprv_strcpy(platformString, "ibm-");
123 return 4;
124 case UCNV_UNKNOWN:
125 break;
126 }
127
128 /* default to empty string */
129 *platformString = 0;
130 return 0;
131 }
132
133 /*Assumes a $platform-#codepage.$CONVERTER_FILE_EXTENSION scheme and calls
134 *through createConverter*/
135 U_CAPI UConverter* U_EXPORT2
ucnv_openCCSID(int32_t codepage,UConverterPlatform platform,UErrorCode * err)136 ucnv_openCCSID (int32_t codepage,
137 UConverterPlatform platform,
138 UErrorCode * err)
139 {
140 char myName[UCNV_MAX_CONVERTER_NAME_LENGTH];
141 int32_t myNameLen;
142
143 if (err == nullptr || U_FAILURE (*err))
144 return nullptr;
145
146 /* ucnv_copyPlatformString could return "ibm-" or "cp" */
147 myNameLen = ucnv_copyPlatformString(myName, platform);
148 T_CString_integerToString(myName + myNameLen, codepage, 10);
149
150 return ucnv_createConverter(nullptr, myName, err);
151 }
152
153 /* Creating a temporary stack-based object that can be used in one thread,
154 and created from a converter that is shared across threads.
155 */
156
157 U_CAPI UConverter* U_EXPORT2
ucnv_safeClone(const UConverter * cnv,void * stackBuffer,int32_t * pBufferSize,UErrorCode * status)158 ucnv_safeClone(const UConverter* cnv, void *stackBuffer, int32_t *pBufferSize, UErrorCode *status)
159 {
160 UConverter *localConverter, *allocatedConverter;
161 int32_t stackBufferSize;
162 int32_t bufferSizeNeeded;
163 UErrorCode cbErr;
164 UConverterToUnicodeArgs toUArgs = {
165 sizeof(UConverterToUnicodeArgs),
166 true,
167 nullptr,
168 nullptr,
169 nullptr,
170 nullptr,
171 nullptr,
172 nullptr
173 };
174 UConverterFromUnicodeArgs fromUArgs = {
175 sizeof(UConverterFromUnicodeArgs),
176 true,
177 nullptr,
178 nullptr,
179 nullptr,
180 nullptr,
181 nullptr,
182 nullptr
183 };
184
185 UTRACE_ENTRY_OC(UTRACE_UCNV_CLONE);
186
187 if (status == nullptr || U_FAILURE(*status)){
188 UTRACE_EXIT_STATUS(status? *status: U_ILLEGAL_ARGUMENT_ERROR);
189 return nullptr;
190 }
191
192 if (cnv == nullptr) {
193 *status = U_ILLEGAL_ARGUMENT_ERROR;
194 UTRACE_EXIT_STATUS(*status);
195 return nullptr;
196 }
197
198 UTRACE_DATA3(UTRACE_OPEN_CLOSE, "clone converter %s at %p into stackBuffer %p",
199 ucnv_getName(cnv, status), cnv, stackBuffer);
200
201 if (cnv->sharedData->impl->safeClone != nullptr) {
202 /* call the custom safeClone function for sizing */
203 bufferSizeNeeded = 0;
204 cnv->sharedData->impl->safeClone(cnv, nullptr, &bufferSizeNeeded, status);
205 if (U_FAILURE(*status)) {
206 UTRACE_EXIT_STATUS(*status);
207 return nullptr;
208 }
209 }
210 else
211 {
212 /* inherent sizing */
213 bufferSizeNeeded = sizeof(UConverter);
214 }
215
216 if (pBufferSize == nullptr) {
217 stackBufferSize = 1;
218 pBufferSize = &stackBufferSize;
219 } else {
220 stackBufferSize = *pBufferSize;
221 if (stackBufferSize <= 0){ /* 'preflighting' request - set needed size into *pBufferSize */
222 *pBufferSize = bufferSizeNeeded;
223 UTRACE_EXIT_VALUE(bufferSizeNeeded);
224 return nullptr;
225 }
226 }
227
228 /* Adjust (if necessary) the stackBuffer pointer to be aligned correctly for a UConverter.
229 * TODO(Jira ICU-20736) Redo this using std::align() once g++4.9 compatibility is no longer needed.
230 */
231 if (stackBuffer) {
232 uintptr_t p = reinterpret_cast<uintptr_t>(stackBuffer);
233 uintptr_t aligned_p = (p + alignof(UConverter) - 1) & ~(alignof(UConverter) - 1);
234 ptrdiff_t pointerAdjustment = aligned_p - p;
235 if (bufferSizeNeeded + pointerAdjustment <= stackBufferSize) {
236 stackBuffer = reinterpret_cast<void *>(aligned_p);
237 stackBufferSize -= static_cast<int32_t>(pointerAdjustment);
238 } else {
239 /* prevent using the stack buffer but keep the size > 0 so that we do not just preflight */
240 stackBufferSize = 1;
241 }
242 }
243
244 /* Now, see if we must allocate any memory */
245 if (stackBufferSize < bufferSizeNeeded || stackBuffer == nullptr)
246 {
247 /* allocate one here...*/
248 localConverter = allocatedConverter = (UConverter *) uprv_malloc (bufferSizeNeeded);
249
250 if(localConverter == nullptr) {
251 *status = U_MEMORY_ALLOCATION_ERROR;
252 UTRACE_EXIT_STATUS(*status);
253 return nullptr;
254 }
255 // If pBufferSize was nullptr as the input, pBufferSize is set to &stackBufferSize in this function.
256 if (pBufferSize != &stackBufferSize) {
257 *status = U_SAFECLONE_ALLOCATED_WARNING;
258 }
259
260 /* record the fact that memory was allocated */
261 *pBufferSize = bufferSizeNeeded;
262 } else {
263 /* just use the stack buffer */
264 localConverter = (UConverter*) stackBuffer;
265 allocatedConverter = nullptr;
266 }
267
268 uprv_memset(localConverter, 0, bufferSizeNeeded);
269
270 /* Copy initial state */
271 uprv_memcpy(localConverter, cnv, sizeof(UConverter));
272 localConverter->isCopyLocal = localConverter->isExtraLocal = false;
273
274 /* copy the substitution string */
275 if (cnv->subChars == (uint8_t *)cnv->subUChars) {
276 localConverter->subChars = (uint8_t *)localConverter->subUChars;
277 } else {
278 localConverter->subChars = (uint8_t *)uprv_malloc(UCNV_ERROR_BUFFER_LENGTH * U_SIZEOF_UCHAR);
279 if (localConverter->subChars == nullptr) {
280 uprv_free(allocatedConverter);
281 UTRACE_EXIT_STATUS(*status);
282 return nullptr;
283 }
284 uprv_memcpy(localConverter->subChars, cnv->subChars, UCNV_ERROR_BUFFER_LENGTH * U_SIZEOF_UCHAR);
285 }
286
287 /* now either call the safeclone fcn or not */
288 if (cnv->sharedData->impl->safeClone != nullptr) {
289 /* call the custom safeClone function */
290 localConverter = cnv->sharedData->impl->safeClone(cnv, localConverter, pBufferSize, status);
291 }
292
293 if(localConverter==nullptr || U_FAILURE(*status)) {
294 if (allocatedConverter != nullptr && allocatedConverter->subChars != (uint8_t *)allocatedConverter->subUChars) {
295 uprv_free(allocatedConverter->subChars);
296 }
297 uprv_free(allocatedConverter);
298 UTRACE_EXIT_STATUS(*status);
299 return nullptr;
300 }
301
302 /* increment refcount of shared data if needed */
303 if (cnv->sharedData->isReferenceCounted) {
304 ucnv_incrementRefCount(cnv->sharedData);
305 }
306
307 if(localConverter == (UConverter*)stackBuffer) {
308 /* we're using user provided data - set to not destroy */
309 localConverter->isCopyLocal = true;
310 }
311
312 /* allow callback functions to handle any memory allocation */
313 toUArgs.converter = fromUArgs.converter = localConverter;
314 cbErr = U_ZERO_ERROR;
315 cnv->fromCharErrorBehaviour(cnv->toUContext, &toUArgs, nullptr, 0, UCNV_CLONE, &cbErr);
316 cbErr = U_ZERO_ERROR;
317 cnv->fromUCharErrorBehaviour(cnv->fromUContext, &fromUArgs, nullptr, 0, 0, UCNV_CLONE, &cbErr);
318
319 UTRACE_EXIT_PTR_STATUS(localConverter, *status);
320 return localConverter;
321 }
322
323 U_CAPI UConverter* U_EXPORT2
ucnv_clone(const UConverter * cnv,UErrorCode * status)324 ucnv_clone(const UConverter* cnv, UErrorCode *status)
325 {
326 return ucnv_safeClone(cnv, nullptr, nullptr, status);
327 }
328
329 /*Decreases the reference counter in the shared immutable section of the object
330 *and frees the mutable part*/
331
332 U_CAPI void U_EXPORT2
ucnv_close(UConverter * converter)333 ucnv_close (UConverter * converter)
334 {
335 UErrorCode errorCode = U_ZERO_ERROR;
336
337 UTRACE_ENTRY_OC(UTRACE_UCNV_CLOSE);
338
339 if (converter == nullptr)
340 {
341 UTRACE_EXIT();
342 return;
343 }
344
345 UTRACE_DATA3(UTRACE_OPEN_CLOSE, "close converter %s at %p, isCopyLocal=%b",
346 ucnv_getName(converter, &errorCode), converter, converter->isCopyLocal);
347
348 /* In order to speed up the close, only call the callbacks when they have been changed.
349 This performance check will only work when the callbacks are set within a shared library
350 or from user code that statically links this code. */
351 /* first, notify the callback functions that the converter is closed */
352 if (converter->fromCharErrorBehaviour != UCNV_TO_U_DEFAULT_CALLBACK) {
353 UConverterToUnicodeArgs toUArgs = {
354 sizeof(UConverterToUnicodeArgs),
355 true,
356 nullptr,
357 nullptr,
358 nullptr,
359 nullptr,
360 nullptr,
361 nullptr
362 };
363
364 toUArgs.converter = converter;
365 errorCode = U_ZERO_ERROR;
366 converter->fromCharErrorBehaviour(converter->toUContext, &toUArgs, nullptr, 0, UCNV_CLOSE, &errorCode);
367 }
368 if (converter->fromUCharErrorBehaviour != UCNV_FROM_U_DEFAULT_CALLBACK) {
369 UConverterFromUnicodeArgs fromUArgs = {
370 sizeof(UConverterFromUnicodeArgs),
371 true,
372 nullptr,
373 nullptr,
374 nullptr,
375 nullptr,
376 nullptr,
377 nullptr
378 };
379 fromUArgs.converter = converter;
380 errorCode = U_ZERO_ERROR;
381 converter->fromUCharErrorBehaviour(converter->fromUContext, &fromUArgs, nullptr, 0, 0, UCNV_CLOSE, &errorCode);
382 }
383
384 if (converter->sharedData->impl->close != nullptr) {
385 converter->sharedData->impl->close(converter);
386 }
387
388 if (converter->subChars != (uint8_t *)converter->subUChars) {
389 uprv_free(converter->subChars);
390 }
391
392 if (converter->sharedData->isReferenceCounted) {
393 ucnv_unloadSharedDataIfReady(converter->sharedData);
394 }
395
396 if(!converter->isCopyLocal){
397 uprv_free(converter);
398 }
399
400 UTRACE_EXIT();
401 }
402
403 /*returns a single Name from the list, will return nullptr if out of bounds
404 */
405 U_CAPI const char* U_EXPORT2
ucnv_getAvailableName(int32_t n)406 ucnv_getAvailableName (int32_t n)
407 {
408 if (0 <= n && n <= 0xffff) {
409 UErrorCode err = U_ZERO_ERROR;
410 const char *name = ucnv_bld_getAvailableConverter((uint16_t)n, &err);
411 if (U_SUCCESS(err)) {
412 return name;
413 }
414 }
415 return nullptr;
416 }
417
418 U_CAPI int32_t U_EXPORT2
ucnv_countAvailable()419 ucnv_countAvailable ()
420 {
421 UErrorCode err = U_ZERO_ERROR;
422 return ucnv_bld_countAvailableConverters(&err);
423 }
424
425 U_CAPI void U_EXPORT2
ucnv_getSubstChars(const UConverter * converter,char * mySubChar,int8_t * len,UErrorCode * err)426 ucnv_getSubstChars (const UConverter * converter,
427 char *mySubChar,
428 int8_t * len,
429 UErrorCode * err)
430 {
431 if (U_FAILURE (*err))
432 return;
433
434 if (converter->subCharLen <= 0) {
435 /* Unicode string or empty string from ucnv_setSubstString(). */
436 *len = 0;
437 return;
438 }
439
440 if (*len < converter->subCharLen) /*not enough space in subChars */
441 {
442 *err = U_INDEX_OUTOFBOUNDS_ERROR;
443 return;
444 }
445
446 uprv_memcpy (mySubChar, converter->subChars, converter->subCharLen); /*fills in the subchars */
447 *len = converter->subCharLen; /*store # of bytes copied to buffer */
448 }
449
450 U_CAPI void U_EXPORT2
ucnv_setSubstChars(UConverter * converter,const char * mySubChar,int8_t len,UErrorCode * err)451 ucnv_setSubstChars (UConverter * converter,
452 const char *mySubChar,
453 int8_t len,
454 UErrorCode * err)
455 {
456 if (U_FAILURE (*err))
457 return;
458
459 /*Makes sure that the subChar is within the codepages char length boundaries */
460 if ((len > converter->sharedData->staticData->maxBytesPerChar)
461 || (len < converter->sharedData->staticData->minBytesPerChar))
462 {
463 *err = U_ILLEGAL_ARGUMENT_ERROR;
464 return;
465 }
466
467 uprv_memcpy (converter->subChars, mySubChar, len); /*copies the subchars */
468 converter->subCharLen = len; /*sets the new len */
469
470 /*
471 * There is currently (2001Feb) no separate API to set/get subChar1.
472 * In order to always have subChar written after it is explicitly set,
473 * we set subChar1 to 0.
474 */
475 converter->subChar1 = 0;
476
477 return;
478 }
479
480 U_CAPI void U_EXPORT2
ucnv_setSubstString(UConverter * cnv,const char16_t * s,int32_t length,UErrorCode * err)481 ucnv_setSubstString(UConverter *cnv,
482 const char16_t *s,
483 int32_t length,
484 UErrorCode *err) {
485 alignas(UConverter) char cloneBuffer[U_CNV_SAFECLONE_BUFFERSIZE];
486 char chars[UCNV_ERROR_BUFFER_LENGTH];
487
488 UConverter *clone;
489 uint8_t *subChars;
490 int32_t cloneSize, length8;
491
492 /* Let the following functions check all arguments. */
493 cloneSize = sizeof(cloneBuffer);
494 clone = ucnv_safeClone(cnv, cloneBuffer, &cloneSize, err);
495 ucnv_setFromUCallBack(clone, UCNV_FROM_U_CALLBACK_STOP, nullptr, nullptr, nullptr, err);
496 length8 = ucnv_fromUChars(clone, chars, (int32_t)sizeof(chars), s, length, err);
497 ucnv_close(clone);
498 if (U_FAILURE(*err)) {
499 return;
500 }
501
502 if (cnv->sharedData->impl->writeSub == nullptr
503 #if !UCONFIG_NO_LEGACY_CONVERSION
504 || (cnv->sharedData->staticData->conversionType == UCNV_MBCS &&
505 ucnv_MBCSGetType(cnv) != UCNV_EBCDIC_STATEFUL)
506 #endif
507 ) {
508 /* The converter is not stateful. Store the charset bytes as a fixed string. */
509 subChars = (uint8_t *)chars;
510 } else {
511 /*
512 * The converter has a non-default writeSub() function, indicating
513 * that it is stateful.
514 * Store the Unicode string for on-the-fly conversion for correct
515 * state handling.
516 */
517 if (length > UCNV_ERROR_BUFFER_LENGTH) {
518 /*
519 * Should not occur. The converter should output at least one byte
520 * per char16_t, which means that ucnv_fromUChars() should catch all
521 * overflows.
522 */
523 *err = U_BUFFER_OVERFLOW_ERROR;
524 return;
525 }
526 subChars = (uint8_t *)s;
527 if (length < 0) {
528 length = u_strlen(s);
529 }
530 length8 = length * U_SIZEOF_UCHAR;
531 }
532
533 /*
534 * For storing the substitution string, select either the small buffer inside
535 * UConverter or allocate a subChars buffer.
536 */
537 if (length8 > UCNV_MAX_SUBCHAR_LEN) {
538 /* Use a separate buffer for the string. Outside UConverter to not make it too large. */
539 if (cnv->subChars == (uint8_t *)cnv->subUChars) {
540 /* Allocate a new buffer for the string. */
541 cnv->subChars = (uint8_t *)uprv_malloc(UCNV_ERROR_BUFFER_LENGTH * U_SIZEOF_UCHAR);
542 if (cnv->subChars == nullptr) {
543 cnv->subChars = (uint8_t *)cnv->subUChars;
544 *err = U_MEMORY_ALLOCATION_ERROR;
545 return;
546 }
547 uprv_memset(cnv->subChars, 0, UCNV_ERROR_BUFFER_LENGTH * U_SIZEOF_UCHAR);
548 }
549 }
550
551 /* Copy the substitution string into the UConverter or its subChars buffer. */
552 if (length8 == 0) {
553 cnv->subCharLen = 0;
554 } else {
555 uprv_memcpy(cnv->subChars, subChars, length8);
556 if (subChars == (uint8_t *)chars) {
557 cnv->subCharLen = (int8_t)length8;
558 } else /* subChars == s */ {
559 cnv->subCharLen = (int8_t)-length;
560 }
561 }
562
563 /* See comment in ucnv_setSubstChars(). */
564 cnv->subChar1 = 0;
565 }
566
567 /*resets the internal states of a converter
568 *goal : have the same behaviour than a freshly created converter
569 */
_reset(UConverter * converter,UConverterResetChoice choice,UBool callCallback)570 static void _reset(UConverter *converter, UConverterResetChoice choice,
571 UBool callCallback) {
572 if(converter == nullptr) {
573 return;
574 }
575
576 if(callCallback) {
577 /* first, notify the callback functions that the converter is reset */
578 UErrorCode errorCode;
579
580 if(choice<=UCNV_RESET_TO_UNICODE && converter->fromCharErrorBehaviour != UCNV_TO_U_DEFAULT_CALLBACK) {
581 UConverterToUnicodeArgs toUArgs = {
582 sizeof(UConverterToUnicodeArgs),
583 true,
584 nullptr,
585 nullptr,
586 nullptr,
587 nullptr,
588 nullptr,
589 nullptr
590 };
591 toUArgs.converter = converter;
592 errorCode = U_ZERO_ERROR;
593 converter->fromCharErrorBehaviour(converter->toUContext, &toUArgs, nullptr, 0, UCNV_RESET, &errorCode);
594 }
595 if(choice!=UCNV_RESET_TO_UNICODE && converter->fromUCharErrorBehaviour != UCNV_FROM_U_DEFAULT_CALLBACK) {
596 UConverterFromUnicodeArgs fromUArgs = {
597 sizeof(UConverterFromUnicodeArgs),
598 true,
599 nullptr,
600 nullptr,
601 nullptr,
602 nullptr,
603 nullptr,
604 nullptr
605 };
606 fromUArgs.converter = converter;
607 errorCode = U_ZERO_ERROR;
608 converter->fromUCharErrorBehaviour(converter->fromUContext, &fromUArgs, nullptr, 0, 0, UCNV_RESET, &errorCode);
609 }
610 }
611
612 /* now reset the converter itself */
613 if(choice<=UCNV_RESET_TO_UNICODE) {
614 converter->toUnicodeStatus = converter->sharedData->toUnicodeStatus;
615 converter->mode = 0;
616 converter->toULength = 0;
617 converter->invalidCharLength = converter->UCharErrorBufferLength = 0;
618 converter->preToULength = 0;
619 }
620 if(choice!=UCNV_RESET_TO_UNICODE) {
621 converter->fromUnicodeStatus = 0;
622 converter->fromUChar32 = 0;
623 converter->invalidUCharLength = converter->charErrorBufferLength = 0;
624 converter->preFromUFirstCP = U_SENTINEL;
625 converter->preFromULength = 0;
626 }
627
628 if (converter->sharedData->impl->reset != nullptr) {
629 /* call the custom reset function */
630 converter->sharedData->impl->reset(converter, choice);
631 }
632 }
633
634 U_CAPI void U_EXPORT2
ucnv_reset(UConverter * converter)635 ucnv_reset(UConverter *converter)
636 {
637 _reset(converter, UCNV_RESET_BOTH, true);
638 }
639
640 U_CAPI void U_EXPORT2
ucnv_resetToUnicode(UConverter * converter)641 ucnv_resetToUnicode(UConverter *converter)
642 {
643 _reset(converter, UCNV_RESET_TO_UNICODE, true);
644 }
645
646 U_CAPI void U_EXPORT2
ucnv_resetFromUnicode(UConverter * converter)647 ucnv_resetFromUnicode(UConverter *converter)
648 {
649 _reset(converter, UCNV_RESET_FROM_UNICODE, true);
650 }
651
652 U_CAPI int8_t U_EXPORT2
ucnv_getMaxCharSize(const UConverter * converter)653 ucnv_getMaxCharSize (const UConverter * converter)
654 {
655 return converter->maxBytesPerUChar;
656 }
657
658
659 U_CAPI int8_t U_EXPORT2
ucnv_getMinCharSize(const UConverter * converter)660 ucnv_getMinCharSize (const UConverter * converter)
661 {
662 return converter->sharedData->staticData->minBytesPerChar;
663 }
664
665 U_CAPI const char* U_EXPORT2
ucnv_getName(const UConverter * converter,UErrorCode * err)666 ucnv_getName (const UConverter * converter, UErrorCode * err)
667
668 {
669 if (U_FAILURE (*err))
670 return nullptr;
671 if(converter->sharedData->impl->getName){
672 const char* temp= converter->sharedData->impl->getName(converter);
673 if(temp)
674 return temp;
675 }
676 return converter->sharedData->staticData->name;
677 }
678
679 U_CAPI int32_t U_EXPORT2
ucnv_getCCSID(const UConverter * converter,UErrorCode * err)680 ucnv_getCCSID(const UConverter * converter,
681 UErrorCode * err)
682 {
683 int32_t ccsid;
684 if (U_FAILURE (*err))
685 return -1;
686
687 ccsid = converter->sharedData->staticData->codepage;
688 if (ccsid == 0) {
689 /* Rare case. This is for cases like gb18030,
690 which doesn't have an IBM canonical name, but does have an IBM alias. */
691 const char *standardName = ucnv_getStandardName(ucnv_getName(converter, err), "IBM", err);
692 if (U_SUCCESS(*err) && standardName) {
693 const char *ccsidStr = uprv_strchr(standardName, '-');
694 if (ccsidStr) {
695 ccsid = (int32_t)atol(ccsidStr+1); /* +1 to skip '-' */
696 }
697 }
698 }
699 return ccsid;
700 }
701
702
703 U_CAPI UConverterPlatform U_EXPORT2
ucnv_getPlatform(const UConverter * converter,UErrorCode * err)704 ucnv_getPlatform (const UConverter * converter,
705 UErrorCode * err)
706 {
707 if (U_FAILURE (*err))
708 return UCNV_UNKNOWN;
709
710 return (UConverterPlatform)converter->sharedData->staticData->platform;
711 }
712
713 U_CAPI void U_EXPORT2
ucnv_getToUCallBack(const UConverter * converter,UConverterToUCallback * action,const void ** context)714 ucnv_getToUCallBack (const UConverter * converter,
715 UConverterToUCallback *action,
716 const void **context)
717 {
718 *action = converter->fromCharErrorBehaviour;
719 *context = converter->toUContext;
720 }
721
722 U_CAPI void U_EXPORT2
ucnv_getFromUCallBack(const UConverter * converter,UConverterFromUCallback * action,const void ** context)723 ucnv_getFromUCallBack (const UConverter * converter,
724 UConverterFromUCallback *action,
725 const void **context)
726 {
727 *action = converter->fromUCharErrorBehaviour;
728 *context = converter->fromUContext;
729 }
730
731 U_CAPI void U_EXPORT2
ucnv_setToUCallBack(UConverter * converter,UConverterToUCallback newAction,const void * newContext,UConverterToUCallback * oldAction,const void ** oldContext,UErrorCode * err)732 ucnv_setToUCallBack (UConverter * converter,
733 UConverterToUCallback newAction,
734 const void* newContext,
735 UConverterToUCallback *oldAction,
736 const void** oldContext,
737 UErrorCode * err)
738 {
739 if (U_FAILURE (*err))
740 return;
741 if (oldAction) *oldAction = converter->fromCharErrorBehaviour;
742 converter->fromCharErrorBehaviour = newAction;
743 if (oldContext) *oldContext = converter->toUContext;
744 converter->toUContext = newContext;
745 }
746
747 U_CAPI void U_EXPORT2
ucnv_setFromUCallBack(UConverter * converter,UConverterFromUCallback newAction,const void * newContext,UConverterFromUCallback * oldAction,const void ** oldContext,UErrorCode * err)748 ucnv_setFromUCallBack (UConverter * converter,
749 UConverterFromUCallback newAction,
750 const void* newContext,
751 UConverterFromUCallback *oldAction,
752 const void** oldContext,
753 UErrorCode * err)
754 {
755 if (U_FAILURE (*err))
756 return;
757 if (oldAction) *oldAction = converter->fromUCharErrorBehaviour;
758 converter->fromUCharErrorBehaviour = newAction;
759 if (oldContext) *oldContext = converter->fromUContext;
760 converter->fromUContext = newContext;
761 }
762
763 static void
_updateOffsets(int32_t * offsets,int32_t length,int32_t sourceIndex,int32_t errorInputLength)764 _updateOffsets(int32_t *offsets, int32_t length,
765 int32_t sourceIndex, int32_t errorInputLength) {
766 int32_t *limit;
767 int32_t delta, offset;
768
769 if(sourceIndex>=0) {
770 /*
771 * adjust each offset by adding the previous sourceIndex
772 * minus the length of the input sequence that caused an
773 * error, if any
774 */
775 delta=sourceIndex-errorInputLength;
776 } else {
777 /*
778 * set each offset to -1 because this conversion function
779 * does not handle offsets
780 */
781 delta=-1;
782 }
783
784 limit=offsets+length;
785 if(delta==0) {
786 /* most common case, nothing to do */
787 } else if(delta>0) {
788 /* add the delta to each offset (but not if the offset is <0) */
789 while(offsets<limit) {
790 offset=*offsets;
791 if(offset>=0) {
792 *offsets=offset+delta;
793 }
794 ++offsets;
795 }
796 } else /* delta<0 */ {
797 /*
798 * set each offset to -1 because this conversion function
799 * does not handle offsets
800 * or the error input sequence started in a previous buffer
801 */
802 while(offsets<limit) {
803 *offsets++=-1;
804 }
805 }
806 }
807
808 /* ucnv_fromUnicode --------------------------------------------------------- */
809
810 /*
811 * Implementation note for m:n conversions
812 *
813 * While collecting source units to find the longest match for m:n conversion,
814 * some source units may need to be stored for a partial match.
815 * When a second buffer does not yield a match on all of the previously stored
816 * source units, then they must be "replayed", i.e., fed back into the converter.
817 *
818 * The code relies on the fact that replaying will not nest -
819 * converting a replay buffer will not result in a replay.
820 * This is because a replay is necessary only after the _continuation_ of a
821 * partial match failed, but a replay buffer is converted as a whole.
822 * It may result in some of its units being stored again for a partial match,
823 * but there will not be a continuation _during_ the replay which could fail.
824 *
825 * It is conceivable that a callback function could call the converter
826 * recursively in a way that causes another replay to be stored, but that
827 * would be an error in the callback function.
828 * Such violations will cause assertion failures in a debug build,
829 * and wrong output, but they will not cause a crash.
830 */
831
832 static void
_fromUnicodeWithCallback(UConverterFromUnicodeArgs * pArgs,UErrorCode * err)833 _fromUnicodeWithCallback(UConverterFromUnicodeArgs *pArgs, UErrorCode *err) {
834 UConverterFromUnicode fromUnicode;
835 UConverter *cnv;
836 const char16_t *s;
837 char *t;
838 int32_t *offsets;
839 int32_t sourceIndex;
840 int32_t errorInputLength;
841 UBool converterSawEndOfInput, calledCallback;
842
843 /* variables for m:n conversion */
844 char16_t replay[UCNV_EXT_MAX_UCHARS];
845 const char16_t *realSource, *realSourceLimit;
846 int32_t realSourceIndex;
847 UBool realFlush;
848
849 cnv=pArgs->converter;
850 s=pArgs->source;
851 t=pArgs->target;
852 offsets=pArgs->offsets;
853
854 /* get the converter implementation function */
855 sourceIndex=0;
856 if(offsets==nullptr) {
857 fromUnicode=cnv->sharedData->impl->fromUnicode;
858 } else {
859 fromUnicode=cnv->sharedData->impl->fromUnicodeWithOffsets;
860 if(fromUnicode==nullptr) {
861 /* there is no WithOffsets implementation */
862 fromUnicode=cnv->sharedData->impl->fromUnicode;
863 /* we will write -1 for each offset */
864 sourceIndex=-1;
865 }
866 }
867
868 if(cnv->preFromULength>=0) {
869 /* normal mode */
870 realSource=nullptr;
871
872 /* avoid compiler warnings - not otherwise necessary, and the values do not matter */
873 realSourceLimit=nullptr;
874 realFlush=false;
875 realSourceIndex=0;
876 } else {
877 /*
878 * Previous m:n conversion stored source units from a partial match
879 * and failed to consume all of them.
880 * We need to "replay" them from a temporary buffer and convert them first.
881 */
882 realSource=pArgs->source;
883 realSourceLimit=pArgs->sourceLimit;
884 realFlush=pArgs->flush;
885 realSourceIndex=sourceIndex;
886
887 uprv_memcpy(replay, cnv->preFromU, -cnv->preFromULength*U_SIZEOF_UCHAR);
888 pArgs->source=replay;
889 pArgs->sourceLimit=replay-cnv->preFromULength;
890 pArgs->flush=false;
891 sourceIndex=-1;
892
893 cnv->preFromULength=0;
894 }
895
896 /*
897 * loop for conversion and error handling
898 *
899 * loop {
900 * convert
901 * loop {
902 * update offsets
903 * handle end of input
904 * handle errors/call callback
905 * }
906 * }
907 */
908 for(;;) {
909 if(U_SUCCESS(*err)) {
910 /* convert */
911 fromUnicode(pArgs, err);
912
913 /*
914 * set a flag for whether the converter
915 * successfully processed the end of the input
916 *
917 * need not check cnv->preFromULength==0 because a replay (<0) will cause
918 * s<sourceLimit before converterSawEndOfInput is checked
919 */
920 converterSawEndOfInput=
921 (UBool)(U_SUCCESS(*err) &&
922 pArgs->flush && pArgs->source==pArgs->sourceLimit &&
923 cnv->fromUChar32==0);
924 } else {
925 /* handle error from ucnv_convertEx() */
926 converterSawEndOfInput=false;
927 }
928
929 /* no callback called yet for this iteration */
930 calledCallback=false;
931
932 /* no sourceIndex adjustment for conversion, only for callback output */
933 errorInputLength=0;
934
935 /*
936 * loop for offsets and error handling
937 *
938 * iterates at most 3 times:
939 * 1. to clean up after the conversion function
940 * 2. after the callback
941 * 3. after the callback again if there was truncated input
942 */
943 for(;;) {
944 /* update offsets if we write any */
945 if(offsets!=nullptr) {
946 int32_t length=(int32_t)(pArgs->target-t);
947 if(length>0) {
948 _updateOffsets(offsets, length, sourceIndex, errorInputLength);
949
950 /*
951 * if a converter handles offsets and updates the offsets
952 * pointer at the end, then pArgs->offset should not change
953 * here;
954 * however, some converters do not handle offsets at all
955 * (sourceIndex<0) or may not update the offsets pointer
956 */
957 pArgs->offsets=offsets+=length;
958 }
959
960 if(sourceIndex>=0) {
961 sourceIndex+=(int32_t)(pArgs->source-s);
962 }
963 }
964
965 if(cnv->preFromULength<0) {
966 /*
967 * switch the source to new replay units (cannot occur while replaying)
968 * after offset handling and before end-of-input and callback handling
969 */
970 if(realSource==nullptr) {
971 realSource=pArgs->source;
972 realSourceLimit=pArgs->sourceLimit;
973 realFlush=pArgs->flush;
974 realSourceIndex=sourceIndex;
975
976 uprv_memcpy(replay, cnv->preFromU, -cnv->preFromULength*U_SIZEOF_UCHAR);
977 pArgs->source=replay;
978 pArgs->sourceLimit=replay-cnv->preFromULength;
979 pArgs->flush=false;
980 if((sourceIndex+=cnv->preFromULength)<0) {
981 sourceIndex=-1;
982 }
983
984 cnv->preFromULength=0;
985 } else {
986 /* see implementation note before _fromUnicodeWithCallback() */
987 U_ASSERT(realSource==nullptr);
988 *err=U_INTERNAL_PROGRAM_ERROR;
989 }
990 }
991
992 /* update pointers */
993 s=pArgs->source;
994 t=pArgs->target;
995
996 if(U_SUCCESS(*err)) {
997 if(s<pArgs->sourceLimit) {
998 /*
999 * continue with the conversion loop while there is still input left
1000 * (continue converting by breaking out of only the inner loop)
1001 */
1002 break;
1003 } else if(realSource!=nullptr) {
1004 /* switch back from replaying to the real source and continue */
1005 pArgs->source=realSource;
1006 pArgs->sourceLimit=realSourceLimit;
1007 pArgs->flush=realFlush;
1008 sourceIndex=realSourceIndex;
1009
1010 realSource=nullptr;
1011 break;
1012 } else if(pArgs->flush && cnv->fromUChar32!=0) {
1013 /*
1014 * the entire input stream is consumed
1015 * and there is a partial, truncated input sequence left
1016 */
1017
1018 /* inject an error and continue with callback handling */
1019 *err=U_TRUNCATED_CHAR_FOUND;
1020 calledCallback=false; /* new error condition */
1021 } else {
1022 /* input consumed */
1023 if(pArgs->flush) {
1024 /*
1025 * return to the conversion loop once more if the flush
1026 * flag is set and the conversion function has not
1027 * successfully processed the end of the input yet
1028 *
1029 * (continue converting by breaking out of only the inner loop)
1030 */
1031 if(!converterSawEndOfInput) {
1032 break;
1033 }
1034
1035 /* reset the converter without calling the callback function */
1036 _reset(cnv, UCNV_RESET_FROM_UNICODE, false);
1037 }
1038
1039 /* done successfully */
1040 return;
1041 }
1042 }
1043
1044 /* U_FAILURE(*err) */
1045 {
1046 UErrorCode e;
1047
1048 if( calledCallback ||
1049 (e=*err)==U_BUFFER_OVERFLOW_ERROR ||
1050 (e!=U_INVALID_CHAR_FOUND &&
1051 e!=U_ILLEGAL_CHAR_FOUND &&
1052 e!=U_TRUNCATED_CHAR_FOUND)
1053 ) {
1054 /*
1055 * the callback did not or cannot resolve the error:
1056 * set output pointers and return
1057 *
1058 * the check for buffer overflow is redundant but it is
1059 * a high-runner case and hopefully documents the intent
1060 * well
1061 *
1062 * if we were replaying, then the replay buffer must be
1063 * copied back into the UConverter
1064 * and the real arguments must be restored
1065 */
1066 if(realSource!=nullptr) {
1067 int32_t length;
1068
1069 U_ASSERT(cnv->preFromULength==0);
1070
1071 length=(int32_t)(pArgs->sourceLimit-pArgs->source);
1072 if(length>0) {
1073 u_memcpy(cnv->preFromU, pArgs->source, length);
1074 cnv->preFromULength=(int8_t)-length;
1075 }
1076
1077 pArgs->source=realSource;
1078 pArgs->sourceLimit=realSourceLimit;
1079 pArgs->flush=realFlush;
1080 }
1081
1082 return;
1083 }
1084 }
1085
1086 /* callback handling */
1087 {
1088 UChar32 codePoint;
1089
1090 /* get and write the code point */
1091 codePoint=cnv->fromUChar32;
1092 errorInputLength=0;
1093 U16_APPEND_UNSAFE(cnv->invalidUCharBuffer, errorInputLength, codePoint);
1094 cnv->invalidUCharLength=(int8_t)errorInputLength;
1095
1096 /* set the converter state to deal with the next character */
1097 cnv->fromUChar32=0;
1098
1099 /* call the callback function */
1100 cnv->fromUCharErrorBehaviour(cnv->fromUContext, pArgs,
1101 cnv->invalidUCharBuffer, errorInputLength, codePoint,
1102 *err==U_INVALID_CHAR_FOUND ? UCNV_UNASSIGNED : UCNV_ILLEGAL,
1103 err);
1104 }
1105
1106 /*
1107 * loop back to the offset handling
1108 *
1109 * this flag will indicate after offset handling
1110 * that a callback was called;
1111 * if the callback did not resolve the error, then we return
1112 */
1113 calledCallback=true;
1114 }
1115 }
1116 }
1117
1118 /*
1119 * Output the fromUnicode overflow buffer.
1120 * Call this function if(cnv->charErrorBufferLength>0).
1121 * @return true if overflow
1122 */
1123 static UBool
ucnv_outputOverflowFromUnicode(UConverter * cnv,char ** target,const char * targetLimit,int32_t ** pOffsets,UErrorCode * err)1124 ucnv_outputOverflowFromUnicode(UConverter *cnv,
1125 char **target, const char *targetLimit,
1126 int32_t **pOffsets,
1127 UErrorCode *err) {
1128 int32_t *offsets;
1129 char *overflow, *t;
1130 int32_t i, length;
1131
1132 t=*target;
1133 if(pOffsets!=nullptr) {
1134 offsets=*pOffsets;
1135 } else {
1136 offsets=nullptr;
1137 }
1138
1139 overflow=(char *)cnv->charErrorBuffer;
1140 length=cnv->charErrorBufferLength;
1141 i=0;
1142 while(i<length) {
1143 if(t==targetLimit) {
1144 /* the overflow buffer contains too much, keep the rest */
1145 int32_t j=0;
1146
1147 do {
1148 overflow[j++]=overflow[i++];
1149 } while(i<length);
1150
1151 cnv->charErrorBufferLength=(int8_t)j;
1152 *target=t;
1153 if(offsets!=nullptr) {
1154 *pOffsets=offsets;
1155 }
1156 *err=U_BUFFER_OVERFLOW_ERROR;
1157 return true;
1158 }
1159
1160 /* copy the overflow contents to the target */
1161 *t++=overflow[i++];
1162 if(offsets!=nullptr) {
1163 *offsets++=-1; /* no source index available for old output */
1164 }
1165 }
1166
1167 /* the overflow buffer is completely copied to the target */
1168 cnv->charErrorBufferLength=0;
1169 *target=t;
1170 if(offsets!=nullptr) {
1171 *pOffsets=offsets;
1172 }
1173 return false;
1174 }
1175
1176 U_CAPI void U_EXPORT2
ucnv_fromUnicode(UConverter * cnv,char ** target,const char * targetLimit,const char16_t ** source,const char16_t * sourceLimit,int32_t * offsets,UBool flush,UErrorCode * err)1177 ucnv_fromUnicode(UConverter *cnv,
1178 char **target, const char *targetLimit,
1179 const char16_t **source, const char16_t *sourceLimit,
1180 int32_t *offsets,
1181 UBool flush,
1182 UErrorCode *err) {
1183 UConverterFromUnicodeArgs args;
1184 const char16_t *s;
1185 char *t;
1186
1187 /* check parameters */
1188 if(err==nullptr || U_FAILURE(*err)) {
1189 return;
1190 }
1191
1192 if(cnv==nullptr || target==nullptr || source==nullptr) {
1193 *err=U_ILLEGAL_ARGUMENT_ERROR;
1194 return;
1195 }
1196
1197 s=*source;
1198 t=*target;
1199
1200 if ((const void *)U_MAX_PTR(sourceLimit) == (const void *)sourceLimit) {
1201 /*
1202 Prevent code from going into an infinite loop in case we do hit this
1203 limit. The limit pointer is expected to be on a char16_t * boundary.
1204 This also prevents the next argument check from failing.
1205 */
1206 sourceLimit = (const char16_t *)(((const char *)sourceLimit) - 1);
1207 }
1208
1209 /*
1210 * All these conditions should never happen.
1211 *
1212 * 1) Make sure that the limits are >= to the address source or target
1213 *
1214 * 2) Make sure that the buffer sizes do not exceed the number range for
1215 * int32_t because some functions use the size (in units or bytes)
1216 * rather than comparing pointers, and because offsets are int32_t values.
1217 *
1218 * size_t is guaranteed to be unsigned and large enough for the job.
1219 *
1220 * Return with an error instead of adjusting the limits because we would
1221 * not be able to maintain the semantics that either the source must be
1222 * consumed or the target filled (unless an error occurs).
1223 * An adjustment would be targetLimit=t+0x7fffffff; for example.
1224 *
1225 * 3) Make sure that the user didn't incorrectly cast a char16_t * pointer
1226 * to a char * pointer and provide an incomplete char16_t code unit.
1227 */
1228 if (sourceLimit<s || targetLimit<t ||
1229 ((size_t)(sourceLimit-s)>(size_t)0x3fffffff && sourceLimit>s) ||
1230 ((size_t)(targetLimit-t)>(size_t)0x7fffffff && targetLimit>t) ||
1231 (((const char *)sourceLimit-(const char *)s) & 1) != 0)
1232 {
1233 *err=U_ILLEGAL_ARGUMENT_ERROR;
1234 return;
1235 }
1236
1237 /* output the target overflow buffer */
1238 if( cnv->charErrorBufferLength>0 &&
1239 ucnv_outputOverflowFromUnicode(cnv, target, targetLimit, &offsets, err)
1240 ) {
1241 /* U_BUFFER_OVERFLOW_ERROR */
1242 return;
1243 }
1244 /* *target may have moved, therefore stop using t */
1245
1246 if(!flush && s==sourceLimit && cnv->preFromULength>=0) {
1247 /* the overflow buffer is emptied and there is no new input: we are done */
1248 return;
1249 }
1250
1251 /*
1252 * Do not simply return with a buffer overflow error if
1253 * !flush && t==targetLimit
1254 * because it is possible that the source will not generate any output.
1255 * For example, the skip callback may be called;
1256 * it does not output anything.
1257 */
1258
1259 /* prepare the converter arguments */
1260 args.converter=cnv;
1261 args.flush=flush;
1262 args.offsets=offsets;
1263 args.source=s;
1264 args.sourceLimit=sourceLimit;
1265 args.target=*target;
1266 args.targetLimit=targetLimit;
1267 args.size=sizeof(args);
1268
1269 _fromUnicodeWithCallback(&args, err);
1270
1271 *source=args.source;
1272 *target=args.target;
1273 }
1274
1275 /* ucnv_toUnicode() --------------------------------------------------------- */
1276
1277 static void
_toUnicodeWithCallback(UConverterToUnicodeArgs * pArgs,UErrorCode * err)1278 _toUnicodeWithCallback(UConverterToUnicodeArgs *pArgs, UErrorCode *err) {
1279 UConverterToUnicode toUnicode;
1280 UConverter *cnv;
1281 const char *s;
1282 char16_t *t;
1283 int32_t *offsets;
1284 int32_t sourceIndex;
1285 int32_t errorInputLength;
1286 UBool converterSawEndOfInput, calledCallback;
1287
1288 /* variables for m:n conversion */
1289 char replay[UCNV_EXT_MAX_BYTES];
1290 const char *realSource, *realSourceLimit;
1291 int32_t realSourceIndex;
1292 UBool realFlush;
1293
1294 cnv=pArgs->converter;
1295 s=pArgs->source;
1296 t=pArgs->target;
1297 offsets=pArgs->offsets;
1298
1299 /* get the converter implementation function */
1300 sourceIndex=0;
1301 if(offsets==nullptr) {
1302 toUnicode=cnv->sharedData->impl->toUnicode;
1303 } else {
1304 toUnicode=cnv->sharedData->impl->toUnicodeWithOffsets;
1305 if(toUnicode==nullptr) {
1306 /* there is no WithOffsets implementation */
1307 toUnicode=cnv->sharedData->impl->toUnicode;
1308 /* we will write -1 for each offset */
1309 sourceIndex=-1;
1310 }
1311 }
1312
1313 if(cnv->preToULength>=0) {
1314 /* normal mode */
1315 realSource=nullptr;
1316
1317 /* avoid compiler warnings - not otherwise necessary, and the values do not matter */
1318 realSourceLimit=nullptr;
1319 realFlush=false;
1320 realSourceIndex=0;
1321 } else {
1322 /*
1323 * Previous m:n conversion stored source units from a partial match
1324 * and failed to consume all of them.
1325 * We need to "replay" them from a temporary buffer and convert them first.
1326 */
1327 realSource=pArgs->source;
1328 realSourceLimit=pArgs->sourceLimit;
1329 realFlush=pArgs->flush;
1330 realSourceIndex=sourceIndex;
1331
1332 uprv_memcpy(replay, cnv->preToU, -cnv->preToULength);
1333 pArgs->source=replay;
1334 pArgs->sourceLimit=replay-cnv->preToULength;
1335 pArgs->flush=false;
1336 sourceIndex=-1;
1337
1338 cnv->preToULength=0;
1339 }
1340
1341 /*
1342 * loop for conversion and error handling
1343 *
1344 * loop {
1345 * convert
1346 * loop {
1347 * update offsets
1348 * handle end of input
1349 * handle errors/call callback
1350 * }
1351 * }
1352 */
1353 for(;;) {
1354 if(U_SUCCESS(*err)) {
1355 /* convert */
1356 toUnicode(pArgs, err);
1357
1358 /*
1359 * set a flag for whether the converter
1360 * successfully processed the end of the input
1361 *
1362 * need not check cnv->preToULength==0 because a replay (<0) will cause
1363 * s<sourceLimit before converterSawEndOfInput is checked
1364 */
1365 converterSawEndOfInput=
1366 (UBool)(U_SUCCESS(*err) &&
1367 pArgs->flush && pArgs->source==pArgs->sourceLimit &&
1368 cnv->toULength==0);
1369 } else {
1370 /* handle error from getNextUChar() or ucnv_convertEx() */
1371 converterSawEndOfInput=false;
1372 }
1373
1374 /* no callback called yet for this iteration */
1375 calledCallback=false;
1376
1377 /* no sourceIndex adjustment for conversion, only for callback output */
1378 errorInputLength=0;
1379
1380 /*
1381 * loop for offsets and error handling
1382 *
1383 * iterates at most 3 times:
1384 * 1. to clean up after the conversion function
1385 * 2. after the callback
1386 * 3. after the callback again if there was truncated input
1387 */
1388 for(;;) {
1389 /* update offsets if we write any */
1390 if(offsets!=nullptr) {
1391 int32_t length=(int32_t)(pArgs->target-t);
1392 if(length>0) {
1393 _updateOffsets(offsets, length, sourceIndex, errorInputLength);
1394
1395 /*
1396 * if a converter handles offsets and updates the offsets
1397 * pointer at the end, then pArgs->offset should not change
1398 * here;
1399 * however, some converters do not handle offsets at all
1400 * (sourceIndex<0) or may not update the offsets pointer
1401 */
1402 pArgs->offsets=offsets+=length;
1403 }
1404
1405 if(sourceIndex>=0) {
1406 sourceIndex+=(int32_t)(pArgs->source-s);
1407 }
1408 }
1409
1410 if(cnv->preToULength<0) {
1411 /*
1412 * switch the source to new replay units (cannot occur while replaying)
1413 * after offset handling and before end-of-input and callback handling
1414 */
1415 if(realSource==nullptr) {
1416 realSource=pArgs->source;
1417 realSourceLimit=pArgs->sourceLimit;
1418 realFlush=pArgs->flush;
1419 realSourceIndex=sourceIndex;
1420
1421 uprv_memcpy(replay, cnv->preToU, -cnv->preToULength);
1422 pArgs->source=replay;
1423 pArgs->sourceLimit=replay-cnv->preToULength;
1424 pArgs->flush=false;
1425 if((sourceIndex+=cnv->preToULength)<0) {
1426 sourceIndex=-1;
1427 }
1428
1429 cnv->preToULength=0;
1430 } else {
1431 /* see implementation note before _fromUnicodeWithCallback() */
1432 U_ASSERT(realSource==nullptr);
1433 *err=U_INTERNAL_PROGRAM_ERROR;
1434 }
1435 }
1436
1437 /* update pointers */
1438 s=pArgs->source;
1439 t=pArgs->target;
1440
1441 if(U_SUCCESS(*err)) {
1442 if(s<pArgs->sourceLimit) {
1443 /*
1444 * continue with the conversion loop while there is still input left
1445 * (continue converting by breaking out of only the inner loop)
1446 */
1447 break;
1448 } else if(realSource!=nullptr) {
1449 /* switch back from replaying to the real source and continue */
1450 pArgs->source=realSource;
1451 pArgs->sourceLimit=realSourceLimit;
1452 pArgs->flush=realFlush;
1453 sourceIndex=realSourceIndex;
1454
1455 realSource=nullptr;
1456 break;
1457 } else if(pArgs->flush && cnv->toULength>0) {
1458 /*
1459 * the entire input stream is consumed
1460 * and there is a partial, truncated input sequence left
1461 */
1462
1463 /* inject an error and continue with callback handling */
1464 *err=U_TRUNCATED_CHAR_FOUND;
1465 calledCallback=false; /* new error condition */
1466 } else {
1467 /* input consumed */
1468 if(pArgs->flush) {
1469 /*
1470 * return to the conversion loop once more if the flush
1471 * flag is set and the conversion function has not
1472 * successfully processed the end of the input yet
1473 *
1474 * (continue converting by breaking out of only the inner loop)
1475 */
1476 if(!converterSawEndOfInput) {
1477 break;
1478 }
1479
1480 /* reset the converter without calling the callback function */
1481 _reset(cnv, UCNV_RESET_TO_UNICODE, false);
1482 }
1483
1484 /* done successfully */
1485 return;
1486 }
1487 }
1488
1489 /* U_FAILURE(*err) */
1490 {
1491 UErrorCode e;
1492
1493 if( calledCallback ||
1494 (e=*err)==U_BUFFER_OVERFLOW_ERROR ||
1495 (e!=U_INVALID_CHAR_FOUND &&
1496 e!=U_ILLEGAL_CHAR_FOUND &&
1497 e!=U_TRUNCATED_CHAR_FOUND &&
1498 e!=U_ILLEGAL_ESCAPE_SEQUENCE &&
1499 e!=U_UNSUPPORTED_ESCAPE_SEQUENCE)
1500 ) {
1501 /*
1502 * the callback did not or cannot resolve the error:
1503 * set output pointers and return
1504 *
1505 * the check for buffer overflow is redundant but it is
1506 * a high-runner case and hopefully documents the intent
1507 * well
1508 *
1509 * if we were replaying, then the replay buffer must be
1510 * copied back into the UConverter
1511 * and the real arguments must be restored
1512 */
1513 if(realSource!=nullptr) {
1514 int32_t length;
1515
1516 U_ASSERT(cnv->preToULength==0);
1517
1518 length=(int32_t)(pArgs->sourceLimit-pArgs->source);
1519 if(length>0) {
1520 uprv_memcpy(cnv->preToU, pArgs->source, length);
1521 cnv->preToULength=(int8_t)-length;
1522 }
1523
1524 pArgs->source=realSource;
1525 pArgs->sourceLimit=realSourceLimit;
1526 pArgs->flush=realFlush;
1527 }
1528
1529 return;
1530 }
1531 }
1532
1533 /* copy toUBytes[] to invalidCharBuffer[] */
1534 errorInputLength=cnv->invalidCharLength=cnv->toULength;
1535 if(errorInputLength>0) {
1536 uprv_memcpy(cnv->invalidCharBuffer, cnv->toUBytes, errorInputLength);
1537 }
1538
1539 /* set the converter state to deal with the next character */
1540 cnv->toULength=0;
1541
1542 /* call the callback function */
1543 if(cnv->toUCallbackReason==UCNV_ILLEGAL && *err==U_INVALID_CHAR_FOUND) {
1544 cnv->toUCallbackReason = UCNV_UNASSIGNED;
1545 }
1546 cnv->fromCharErrorBehaviour(cnv->toUContext, pArgs,
1547 cnv->invalidCharBuffer, errorInputLength,
1548 cnv->toUCallbackReason,
1549 err);
1550 cnv->toUCallbackReason = UCNV_ILLEGAL; /* reset to default value */
1551
1552 /*
1553 * loop back to the offset handling
1554 *
1555 * this flag will indicate after offset handling
1556 * that a callback was called;
1557 * if the callback did not resolve the error, then we return
1558 */
1559 calledCallback=true;
1560 }
1561 }
1562 }
1563
1564 /*
1565 * Output the toUnicode overflow buffer.
1566 * Call this function if(cnv->UCharErrorBufferLength>0).
1567 * @return true if overflow
1568 */
1569 static UBool
ucnv_outputOverflowToUnicode(UConverter * cnv,char16_t ** target,const char16_t * targetLimit,int32_t ** pOffsets,UErrorCode * err)1570 ucnv_outputOverflowToUnicode(UConverter *cnv,
1571 char16_t **target, const char16_t *targetLimit,
1572 int32_t **pOffsets,
1573 UErrorCode *err) {
1574 int32_t *offsets;
1575 char16_t *overflow, *t;
1576 int32_t i, length;
1577
1578 t=*target;
1579 if(pOffsets!=nullptr) {
1580 offsets=*pOffsets;
1581 } else {
1582 offsets=nullptr;
1583 }
1584
1585 overflow=cnv->UCharErrorBuffer;
1586 length=cnv->UCharErrorBufferLength;
1587 i=0;
1588 while(i<length) {
1589 if(t==targetLimit) {
1590 /* the overflow buffer contains too much, keep the rest */
1591 int32_t j=0;
1592
1593 do {
1594 overflow[j++]=overflow[i++];
1595 } while(i<length);
1596
1597 cnv->UCharErrorBufferLength=(int8_t)j;
1598 *target=t;
1599 if(offsets!=nullptr) {
1600 *pOffsets=offsets;
1601 }
1602 *err=U_BUFFER_OVERFLOW_ERROR;
1603 return true;
1604 }
1605
1606 /* copy the overflow contents to the target */
1607 *t++=overflow[i++];
1608 if(offsets!=nullptr) {
1609 *offsets++=-1; /* no source index available for old output */
1610 }
1611 }
1612
1613 /* the overflow buffer is completely copied to the target */
1614 cnv->UCharErrorBufferLength=0;
1615 *target=t;
1616 if(offsets!=nullptr) {
1617 *pOffsets=offsets;
1618 }
1619 return false;
1620 }
1621
1622 U_CAPI void U_EXPORT2
ucnv_toUnicode(UConverter * cnv,char16_t ** target,const char16_t * targetLimit,const char ** source,const char * sourceLimit,int32_t * offsets,UBool flush,UErrorCode * err)1623 ucnv_toUnicode(UConverter *cnv,
1624 char16_t **target, const char16_t *targetLimit,
1625 const char **source, const char *sourceLimit,
1626 int32_t *offsets,
1627 UBool flush,
1628 UErrorCode *err) {
1629 UConverterToUnicodeArgs args;
1630 const char *s;
1631 char16_t *t;
1632
1633 /* check parameters */
1634 if(err==nullptr || U_FAILURE(*err)) {
1635 return;
1636 }
1637
1638 if(cnv==nullptr || target==nullptr || source==nullptr) {
1639 *err=U_ILLEGAL_ARGUMENT_ERROR;
1640 return;
1641 }
1642
1643 s=*source;
1644 t=*target;
1645
1646 if ((const void *)U_MAX_PTR(targetLimit) == (const void *)targetLimit) {
1647 /*
1648 Prevent code from going into an infinite loop in case we do hit this
1649 limit. The limit pointer is expected to be on a char16_t * boundary.
1650 This also prevents the next argument check from failing.
1651 */
1652 targetLimit = (const char16_t *)(((const char *)targetLimit) - 1);
1653 }
1654
1655 /*
1656 * All these conditions should never happen.
1657 *
1658 * 1) Make sure that the limits are >= to the address source or target
1659 *
1660 * 2) Make sure that the buffer sizes do not exceed the number range for
1661 * int32_t because some functions use the size (in units or bytes)
1662 * rather than comparing pointers, and because offsets are int32_t values.
1663 *
1664 * size_t is guaranteed to be unsigned and large enough for the job.
1665 *
1666 * Return with an error instead of adjusting the limits because we would
1667 * not be able to maintain the semantics that either the source must be
1668 * consumed or the target filled (unless an error occurs).
1669 * An adjustment would be sourceLimit=t+0x7fffffff; for example.
1670 *
1671 * 3) Make sure that the user didn't incorrectly cast a char16_t * pointer
1672 * to a char * pointer and provide an incomplete char16_t code unit.
1673 */
1674 if (sourceLimit<s || targetLimit<t ||
1675 ((size_t)(sourceLimit-s)>(size_t)0x7fffffff && sourceLimit>s) ||
1676 ((size_t)(targetLimit-t)>(size_t)0x3fffffff && targetLimit>t) ||
1677 (((const char *)targetLimit-(const char *)t) & 1) != 0
1678 ) {
1679 *err=U_ILLEGAL_ARGUMENT_ERROR;
1680 return;
1681 }
1682
1683 /* output the target overflow buffer */
1684 if( cnv->UCharErrorBufferLength>0 &&
1685 ucnv_outputOverflowToUnicode(cnv, target, targetLimit, &offsets, err)
1686 ) {
1687 /* U_BUFFER_OVERFLOW_ERROR */
1688 return;
1689 }
1690 /* *target may have moved, therefore stop using t */
1691
1692 if(!flush && s==sourceLimit && cnv->preToULength>=0) {
1693 /* the overflow buffer is emptied and there is no new input: we are done */
1694 return;
1695 }
1696
1697 /*
1698 * Do not simply return with a buffer overflow error if
1699 * !flush && t==targetLimit
1700 * because it is possible that the source will not generate any output.
1701 * For example, the skip callback may be called;
1702 * it does not output anything.
1703 */
1704
1705 /* prepare the converter arguments */
1706 args.converter=cnv;
1707 args.flush=flush;
1708 args.offsets=offsets;
1709 args.source=s;
1710 args.sourceLimit=sourceLimit;
1711 args.target=*target;
1712 args.targetLimit=targetLimit;
1713 args.size=sizeof(args);
1714
1715 _toUnicodeWithCallback(&args, err);
1716
1717 *source=args.source;
1718 *target=args.target;
1719 }
1720
1721 /* ucnv_to/fromUChars() ----------------------------------------------------- */
1722
1723 U_CAPI int32_t U_EXPORT2
ucnv_fromUChars(UConverter * cnv,char * dest,int32_t destCapacity,const char16_t * src,int32_t srcLength,UErrorCode * pErrorCode)1724 ucnv_fromUChars(UConverter *cnv,
1725 char *dest, int32_t destCapacity,
1726 const char16_t *src, int32_t srcLength,
1727 UErrorCode *pErrorCode) {
1728 const char16_t *srcLimit;
1729 char *originalDest, *destLimit;
1730 int32_t destLength;
1731
1732 /* check arguments */
1733 if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
1734 return 0;
1735 }
1736
1737 if( cnv==nullptr ||
1738 destCapacity<0 || (destCapacity>0 && dest==nullptr) ||
1739 srcLength<-1 || (srcLength!=0 && src==nullptr)
1740 ) {
1741 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1742 return 0;
1743 }
1744
1745 /* initialize */
1746 ucnv_resetFromUnicode(cnv);
1747 originalDest=dest;
1748 if(srcLength==-1) {
1749 srcLength=u_strlen(src);
1750 }
1751 if(srcLength>0) {
1752 srcLimit=src+srcLength;
1753 destCapacity=pinCapacity(dest, destCapacity);
1754 destLimit=dest+destCapacity;
1755
1756 /* perform the conversion */
1757 ucnv_fromUnicode(cnv, &dest, destLimit, &src, srcLimit, 0, true, pErrorCode);
1758 destLength=(int32_t)(dest-originalDest);
1759
1760 /* if an overflow occurs, then get the preflighting length */
1761 if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
1762 char buffer[1024];
1763
1764 destLimit=buffer+sizeof(buffer);
1765 do {
1766 dest=buffer;
1767 *pErrorCode=U_ZERO_ERROR;
1768 ucnv_fromUnicode(cnv, &dest, destLimit, &src, srcLimit, 0, true, pErrorCode);
1769 destLength+=(int32_t)(dest-buffer);
1770 } while(*pErrorCode==U_BUFFER_OVERFLOW_ERROR);
1771 }
1772 } else {
1773 destLength=0;
1774 }
1775
1776 return u_terminateChars(originalDest, destCapacity, destLength, pErrorCode);
1777 }
1778
1779 U_CAPI int32_t U_EXPORT2
ucnv_toUChars(UConverter * cnv,char16_t * dest,int32_t destCapacity,const char * src,int32_t srcLength,UErrorCode * pErrorCode)1780 ucnv_toUChars(UConverter *cnv,
1781 char16_t *dest, int32_t destCapacity,
1782 const char *src, int32_t srcLength,
1783 UErrorCode *pErrorCode) {
1784 const char *srcLimit;
1785 char16_t *originalDest, *destLimit;
1786 int32_t destLength;
1787
1788 /* check arguments */
1789 if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
1790 return 0;
1791 }
1792
1793 if( cnv==nullptr ||
1794 destCapacity<0 || (destCapacity>0 && dest==nullptr) ||
1795 srcLength<-1 || (srcLength!=0 && src==nullptr))
1796 {
1797 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
1798 return 0;
1799 }
1800
1801 /* initialize */
1802 ucnv_resetToUnicode(cnv);
1803 originalDest=dest;
1804 if(srcLength==-1) {
1805 srcLength=(int32_t)uprv_strlen(src);
1806 }
1807 if(srcLength>0) {
1808 srcLimit=src+srcLength;
1809 destCapacity=pinCapacity(dest, destCapacity);
1810 destLimit=dest+destCapacity;
1811
1812 /* perform the conversion */
1813 ucnv_toUnicode(cnv, &dest, destLimit, &src, srcLimit, 0, true, pErrorCode);
1814 destLength=(int32_t)(dest-originalDest);
1815
1816 /* if an overflow occurs, then get the preflighting length */
1817 if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR)
1818 {
1819 char16_t buffer[1024];
1820
1821 destLimit=buffer+UPRV_LENGTHOF(buffer);
1822 do {
1823 dest=buffer;
1824 *pErrorCode=U_ZERO_ERROR;
1825 ucnv_toUnicode(cnv, &dest, destLimit, &src, srcLimit, 0, true, pErrorCode);
1826 destLength+=(int32_t)(dest-buffer);
1827 }
1828 while(*pErrorCode==U_BUFFER_OVERFLOW_ERROR);
1829 }
1830 } else {
1831 destLength=0;
1832 }
1833
1834 return u_terminateUChars(originalDest, destCapacity, destLength, pErrorCode);
1835 }
1836
1837 /* ucnv_getNextUChar() ------------------------------------------------------ */
1838
1839 U_CAPI UChar32 U_EXPORT2
ucnv_getNextUChar(UConverter * cnv,const char ** source,const char * sourceLimit,UErrorCode * err)1840 ucnv_getNextUChar(UConverter *cnv,
1841 const char **source, const char *sourceLimit,
1842 UErrorCode *err) {
1843 UConverterToUnicodeArgs args;
1844 char16_t buffer[U16_MAX_LENGTH];
1845 const char *s;
1846 UChar32 c;
1847 int32_t i, length;
1848
1849 /* check parameters */
1850 if(err==nullptr || U_FAILURE(*err)) {
1851 return 0xffff;
1852 }
1853
1854 if(cnv==nullptr || source==nullptr) {
1855 *err=U_ILLEGAL_ARGUMENT_ERROR;
1856 return 0xffff;
1857 }
1858
1859 s=*source;
1860 if(sourceLimit<s) {
1861 *err=U_ILLEGAL_ARGUMENT_ERROR;
1862 return 0xffff;
1863 }
1864
1865 /*
1866 * Make sure that the buffer sizes do not exceed the number range for
1867 * int32_t because some functions use the size (in units or bytes)
1868 * rather than comparing pointers, and because offsets are int32_t values.
1869 *
1870 * size_t is guaranteed to be unsigned and large enough for the job.
1871 *
1872 * Return with an error instead of adjusting the limits because we would
1873 * not be able to maintain the semantics that either the source must be
1874 * consumed or the target filled (unless an error occurs).
1875 * An adjustment would be sourceLimit=t+0x7fffffff; for example.
1876 */
1877 if(((size_t)(sourceLimit-s)>(size_t)0x7fffffff && sourceLimit>s)) {
1878 *err=U_ILLEGAL_ARGUMENT_ERROR;
1879 return 0xffff;
1880 }
1881
1882 c=U_SENTINEL;
1883
1884 /* flush the target overflow buffer */
1885 if(cnv->UCharErrorBufferLength>0) {
1886 char16_t *overflow;
1887
1888 overflow=cnv->UCharErrorBuffer;
1889 i=0;
1890 length=cnv->UCharErrorBufferLength;
1891 U16_NEXT(overflow, i, length, c);
1892
1893 /* move the remaining overflow contents up to the beginning */
1894 if((cnv->UCharErrorBufferLength=(int8_t)(length-i))>0) {
1895 uprv_memmove(cnv->UCharErrorBuffer, cnv->UCharErrorBuffer+i,
1896 cnv->UCharErrorBufferLength*U_SIZEOF_UCHAR);
1897 }
1898
1899 if(!U16_IS_LEAD(c) || i<length) {
1900 return c;
1901 }
1902 /*
1903 * Continue if the overflow buffer contained only a lead surrogate,
1904 * in case the converter outputs single surrogates from complete
1905 * input sequences.
1906 */
1907 }
1908
1909 /*
1910 * flush==true is implied for ucnv_getNextUChar()
1911 *
1912 * do not simply return even if s==sourceLimit because the converter may
1913 * not have seen flush==true before
1914 */
1915
1916 /* prepare the converter arguments */
1917 args.converter=cnv;
1918 args.flush=true;
1919 args.offsets=nullptr;
1920 args.source=s;
1921 args.sourceLimit=sourceLimit;
1922 args.target=buffer;
1923 args.targetLimit=buffer+1;
1924 args.size=sizeof(args);
1925
1926 if(c<0) {
1927 /*
1928 * call the native getNextUChar() implementation if we are
1929 * at a character boundary (toULength==0)
1930 *
1931 * unlike with _toUnicode(), getNextUChar() implementations must set
1932 * U_TRUNCATED_CHAR_FOUND for truncated input,
1933 * in addition to setting toULength/toUBytes[]
1934 */
1935 if(cnv->toULength==0 && cnv->sharedData->impl->getNextUChar!=nullptr) {
1936 c=cnv->sharedData->impl->getNextUChar(&args, err);
1937 *source=s=args.source;
1938 if(*err==U_INDEX_OUTOFBOUNDS_ERROR) {
1939 /* reset the converter without calling the callback function */
1940 _reset(cnv, UCNV_RESET_TO_UNICODE, false);
1941 return 0xffff; /* no output */
1942 } else if(U_SUCCESS(*err) && c>=0) {
1943 return c;
1944 /*
1945 * else fall through to use _toUnicode() because
1946 * UCNV_GET_NEXT_UCHAR_USE_TO_U: the native function did not want to handle it after all
1947 * U_FAILURE: call _toUnicode() for callback handling (do not output c)
1948 */
1949 }
1950 }
1951
1952 /* convert to one char16_t in buffer[0], or handle getNextUChar() errors */
1953 _toUnicodeWithCallback(&args, err);
1954
1955 if(*err==U_BUFFER_OVERFLOW_ERROR) {
1956 *err=U_ZERO_ERROR;
1957 }
1958
1959 i=0;
1960 length=(int32_t)(args.target-buffer);
1961 } else {
1962 /* write the lead surrogate from the overflow buffer */
1963 buffer[0]=(char16_t)c;
1964 args.target=buffer+1;
1965 i=0;
1966 length=1;
1967 }
1968
1969 /* buffer contents starts at i and ends before length */
1970
1971 if(U_FAILURE(*err)) {
1972 c=0xffff; /* no output */
1973 } else if(length==0) {
1974 /* no input or only state changes */
1975 *err=U_INDEX_OUTOFBOUNDS_ERROR;
1976 /* no need to reset explicitly because _toUnicodeWithCallback() did it */
1977 c=0xffff; /* no output */
1978 } else {
1979 c=buffer[0];
1980 i=1;
1981 if(!U16_IS_LEAD(c)) {
1982 /* consume c=buffer[0], done */
1983 } else {
1984 /* got a lead surrogate, see if a trail surrogate follows */
1985 char16_t c2;
1986
1987 if(cnv->UCharErrorBufferLength>0) {
1988 /* got overflow output from the conversion */
1989 if(U16_IS_TRAIL(c2=cnv->UCharErrorBuffer[0])) {
1990 /* got a trail surrogate, too */
1991 c=U16_GET_SUPPLEMENTARY(c, c2);
1992
1993 /* move the remaining overflow contents up to the beginning */
1994 if((--cnv->UCharErrorBufferLength)>0) {
1995 uprv_memmove(cnv->UCharErrorBuffer, cnv->UCharErrorBuffer+1,
1996 cnv->UCharErrorBufferLength*U_SIZEOF_UCHAR);
1997 }
1998 } else {
1999 /* c is an unpaired lead surrogate, just return it */
2000 }
2001 } else if(args.source<sourceLimit) {
2002 /* convert once more, to buffer[1] */
2003 args.targetLimit=buffer+2;
2004 _toUnicodeWithCallback(&args, err);
2005 if(*err==U_BUFFER_OVERFLOW_ERROR) {
2006 *err=U_ZERO_ERROR;
2007 }
2008
2009 length=(int32_t)(args.target-buffer);
2010 if(U_SUCCESS(*err) && length==2 && U16_IS_TRAIL(c2=buffer[1])) {
2011 /* got a trail surrogate, too */
2012 c=U16_GET_SUPPLEMENTARY(c, c2);
2013 i=2;
2014 }
2015 }
2016 }
2017 }
2018
2019 /*
2020 * move leftover output from buffer[i..length[
2021 * into the beginning of the overflow buffer
2022 */
2023 if(i<length) {
2024 /* move further overflow back */
2025 int32_t delta=length-i;
2026 if((length=cnv->UCharErrorBufferLength)>0) {
2027 uprv_memmove(cnv->UCharErrorBuffer+delta, cnv->UCharErrorBuffer,
2028 length*U_SIZEOF_UCHAR);
2029 }
2030 cnv->UCharErrorBufferLength=(int8_t)(length+delta);
2031
2032 cnv->UCharErrorBuffer[0]=buffer[i++];
2033 if(delta>1) {
2034 cnv->UCharErrorBuffer[1]=buffer[i];
2035 }
2036 }
2037
2038 *source=args.source;
2039 return c;
2040 }
2041
2042 /* ucnv_convert() and siblings ---------------------------------------------- */
2043
2044 U_CAPI void U_EXPORT2
ucnv_convertEx(UConverter * targetCnv,UConverter * sourceCnv,char ** target,const char * targetLimit,const char ** source,const char * sourceLimit,char16_t * pivotStart,char16_t ** pivotSource,char16_t ** pivotTarget,const char16_t * pivotLimit,UBool reset,UBool flush,UErrorCode * pErrorCode)2045 ucnv_convertEx(UConverter *targetCnv, UConverter *sourceCnv,
2046 char **target, const char *targetLimit,
2047 const char **source, const char *sourceLimit,
2048 char16_t *pivotStart, char16_t **pivotSource,
2049 char16_t **pivotTarget, const char16_t *pivotLimit,
2050 UBool reset, UBool flush,
2051 UErrorCode *pErrorCode) {
2052 char16_t pivotBuffer[CHUNK_SIZE];
2053 const char16_t *myPivotSource;
2054 char16_t *myPivotTarget;
2055 const char *s;
2056 char *t;
2057
2058 UConverterToUnicodeArgs toUArgs;
2059 UConverterFromUnicodeArgs fromUArgs;
2060 UConverterConvert convert;
2061
2062 /* error checking */
2063 if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
2064 return;
2065 }
2066
2067 if( targetCnv==nullptr || sourceCnv==nullptr ||
2068 source==nullptr || *source==nullptr ||
2069 target==nullptr || *target==nullptr || targetLimit==nullptr
2070 ) {
2071 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
2072 return;
2073 }
2074
2075 s=*source;
2076 t=*target;
2077 if((sourceLimit!=nullptr && sourceLimit<s) || targetLimit<t) {
2078 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
2079 return;
2080 }
2081
2082 /*
2083 * Make sure that the buffer sizes do not exceed the number range for
2084 * int32_t. See ucnv_toUnicode() for a more detailed comment.
2085 */
2086 if(
2087 (sourceLimit!=nullptr && ((size_t)(sourceLimit-s)>(size_t)0x7fffffff && sourceLimit>s)) ||
2088 ((size_t)(targetLimit-t)>(size_t)0x7fffffff && targetLimit>t)
2089 ) {
2090 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
2091 return;
2092 }
2093
2094 if(pivotStart==nullptr) {
2095 if(!flush) {
2096 /* streaming conversion requires an explicit pivot buffer */
2097 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
2098 return;
2099 }
2100
2101 /* use the stack pivot buffer */
2102 myPivotSource=myPivotTarget=pivotStart=pivotBuffer;
2103 pivotSource=(char16_t **)&myPivotSource;
2104 pivotTarget=&myPivotTarget;
2105 pivotLimit=pivotBuffer+CHUNK_SIZE;
2106 } else if( pivotStart>=pivotLimit ||
2107 pivotSource==nullptr || *pivotSource==nullptr ||
2108 pivotTarget==nullptr || *pivotTarget==nullptr ||
2109 pivotLimit==nullptr
2110 ) {
2111 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
2112 return;
2113 }
2114
2115 if(sourceLimit==nullptr) {
2116 /* get limit of single-byte-NUL-terminated source string */
2117 sourceLimit=uprv_strchr(*source, 0);
2118 }
2119
2120 if(reset) {
2121 ucnv_resetToUnicode(sourceCnv);
2122 ucnv_resetFromUnicode(targetCnv);
2123 *pivotSource=*pivotTarget=pivotStart;
2124 } else if(targetCnv->charErrorBufferLength>0) {
2125 /* output the targetCnv overflow buffer */
2126 if(ucnv_outputOverflowFromUnicode(targetCnv, target, targetLimit, nullptr, pErrorCode)) {
2127 /* U_BUFFER_OVERFLOW_ERROR */
2128 return;
2129 }
2130 /* *target has moved, therefore stop using t */
2131
2132 if( !flush &&
2133 targetCnv->preFromULength>=0 && *pivotSource==*pivotTarget &&
2134 sourceCnv->UCharErrorBufferLength==0 && sourceCnv->preToULength>=0 && s==sourceLimit
2135 ) {
2136 /* the fromUnicode overflow buffer is emptied and there is no new input: we are done */
2137 return;
2138 }
2139 }
2140
2141 /* Is direct-UTF-8 conversion available? */
2142 if( sourceCnv->sharedData->staticData->conversionType==UCNV_UTF8 &&
2143 targetCnv->sharedData->impl->fromUTF8!=nullptr
2144 ) {
2145 convert=targetCnv->sharedData->impl->fromUTF8;
2146 } else if( targetCnv->sharedData->staticData->conversionType==UCNV_UTF8 &&
2147 sourceCnv->sharedData->impl->toUTF8!=nullptr
2148 ) {
2149 convert=sourceCnv->sharedData->impl->toUTF8;
2150 } else {
2151 convert=nullptr;
2152 }
2153
2154 /*
2155 * If direct-UTF-8 conversion is available, then we use a smaller
2156 * pivot buffer for error handling and partial matches
2157 * so that we quickly return to direct conversion.
2158 *
2159 * 32 is large enough for UCNV_EXT_MAX_UCHARS and UCNV_ERROR_BUFFER_LENGTH.
2160 *
2161 * We could reduce the pivot buffer size further, at the cost of
2162 * buffer overflows from callbacks.
2163 * The pivot buffer should not be smaller than the maximum number of
2164 * fromUnicode extension table input UChars
2165 * (for m:n conversion, see
2166 * targetCnv->sharedData->mbcs.extIndexes[UCNV_EXT_COUNT_UCHARS])
2167 * or 2 for surrogate pairs.
2168 *
2169 * Too small a buffer can cause thrashing between pivoting and direct
2170 * conversion, with function call overhead outweighing the benefits
2171 * of direct conversion.
2172 */
2173 if(convert!=nullptr && (pivotLimit-pivotStart)>32) {
2174 pivotLimit=pivotStart+32;
2175 }
2176
2177 /* prepare the converter arguments */
2178 fromUArgs.converter=targetCnv;
2179 fromUArgs.flush=false;
2180 fromUArgs.offsets=nullptr;
2181 fromUArgs.target=*target;
2182 fromUArgs.targetLimit=targetLimit;
2183 fromUArgs.size=sizeof(fromUArgs);
2184
2185 toUArgs.converter=sourceCnv;
2186 toUArgs.flush=flush;
2187 toUArgs.offsets=nullptr;
2188 toUArgs.source=s;
2189 toUArgs.sourceLimit=sourceLimit;
2190 toUArgs.targetLimit=pivotLimit;
2191 toUArgs.size=sizeof(toUArgs);
2192
2193 /*
2194 * TODO: Consider separating this function into two functions,
2195 * extracting exactly the conversion loop,
2196 * for readability and to reduce the set of visible variables.
2197 *
2198 * Otherwise stop using s and t from here on.
2199 */
2200 s=t=nullptr;
2201
2202 /*
2203 * conversion loop
2204 *
2205 * The sequence of steps in the loop may appear backward,
2206 * but the principle is simple:
2207 * In the chain of
2208 * source - sourceCnv overflow - pivot - targetCnv overflow - target
2209 * empty out later buffers before refilling them from earlier ones.
2210 *
2211 * The targetCnv overflow buffer is flushed out only once before the loop.
2212 */
2213 for(;;) {
2214 /*
2215 * if(pivot not empty or error or replay or flush fromUnicode) {
2216 * fromUnicode(pivot -> target);
2217 * }
2218 *
2219 * For pivoting conversion; and for direct conversion for
2220 * error callback handling and flushing the replay buffer.
2221 */
2222 if( *pivotSource<*pivotTarget ||
2223 U_FAILURE(*pErrorCode) ||
2224 targetCnv->preFromULength<0 ||
2225 fromUArgs.flush
2226 ) {
2227 fromUArgs.source=*pivotSource;
2228 fromUArgs.sourceLimit=*pivotTarget;
2229 _fromUnicodeWithCallback(&fromUArgs, pErrorCode);
2230 if(U_FAILURE(*pErrorCode)) {
2231 /* target overflow, or conversion error */
2232 *pivotSource=(char16_t *)fromUArgs.source;
2233 break;
2234 }
2235
2236 /*
2237 * _fromUnicodeWithCallback() must have consumed the pivot contents
2238 * (*pivotSource==*pivotTarget) since it returned with U_SUCCESS()
2239 */
2240 }
2241
2242 /* The pivot buffer is empty; reset it so we start at pivotStart. */
2243 *pivotSource=*pivotTarget=pivotStart;
2244
2245 /*
2246 * if(sourceCnv overflow buffer not empty) {
2247 * move(sourceCnv overflow buffer -> pivot);
2248 * continue;
2249 * }
2250 */
2251 /* output the sourceCnv overflow buffer */
2252 if(sourceCnv->UCharErrorBufferLength>0) {
2253 if(ucnv_outputOverflowToUnicode(sourceCnv, pivotTarget, pivotLimit, nullptr, pErrorCode)) {
2254 /* U_BUFFER_OVERFLOW_ERROR */
2255 *pErrorCode=U_ZERO_ERROR;
2256 }
2257 continue;
2258 }
2259
2260 /*
2261 * check for end of input and break if done
2262 *
2263 * Checking both flush and fromUArgs.flush ensures that the converters
2264 * have been called with the flush flag set if the ucnv_convertEx()
2265 * caller set it.
2266 */
2267 if( toUArgs.source==sourceLimit &&
2268 sourceCnv->preToULength>=0 && sourceCnv->toULength==0 &&
2269 (!flush || fromUArgs.flush)
2270 ) {
2271 /* done successfully */
2272 break;
2273 }
2274
2275 /*
2276 * use direct conversion if available
2277 * but not if continuing a partial match
2278 * or flushing the toUnicode replay buffer
2279 */
2280 if(convert!=nullptr && targetCnv->preFromUFirstCP<0 && sourceCnv->preToULength==0) {
2281 if(*pErrorCode==U_USING_DEFAULT_WARNING) {
2282 /* remove a warning that may be set by this function */
2283 *pErrorCode=U_ZERO_ERROR;
2284 }
2285 convert(&fromUArgs, &toUArgs, pErrorCode);
2286 if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
2287 break;
2288 } else if(U_FAILURE(*pErrorCode)) {
2289 if(sourceCnv->toULength>0) {
2290 /*
2291 * Fall through to calling _toUnicodeWithCallback()
2292 * for callback handling.
2293 *
2294 * The pivot buffer will be reset with
2295 * *pivotSource=*pivotTarget=pivotStart;
2296 * which indicates a toUnicode error to the caller
2297 * (*pivotSource==pivotStart shows no pivot UChars consumed).
2298 */
2299 } else {
2300 /*
2301 * Indicate a fromUnicode error to the caller
2302 * (*pivotSource>pivotStart shows some pivot UChars consumed).
2303 */
2304 *pivotSource=*pivotTarget=pivotStart+1;
2305 /*
2306 * Loop around to calling _fromUnicodeWithCallbacks()
2307 * for callback handling.
2308 */
2309 continue;
2310 }
2311 } else if(*pErrorCode==U_USING_DEFAULT_WARNING) {
2312 /*
2313 * No error, but the implementation requested to temporarily
2314 * fall back to pivoting.
2315 */
2316 *pErrorCode=U_ZERO_ERROR;
2317 /*
2318 * The following else branches are almost identical to the end-of-input
2319 * handling in _toUnicodeWithCallback().
2320 * Avoid calling it just for the end of input.
2321 */
2322 } else if(flush && sourceCnv->toULength>0) { /* flush==toUArgs.flush */
2323 /*
2324 * the entire input stream is consumed
2325 * and there is a partial, truncated input sequence left
2326 */
2327
2328 /* inject an error and continue with callback handling */
2329 *pErrorCode=U_TRUNCATED_CHAR_FOUND;
2330 } else {
2331 /* input consumed */
2332 if(flush) {
2333 /* reset the converters without calling the callback functions */
2334 _reset(sourceCnv, UCNV_RESET_TO_UNICODE, false);
2335 _reset(targetCnv, UCNV_RESET_FROM_UNICODE, false);
2336 }
2337
2338 /* done successfully */
2339 break;
2340 }
2341 }
2342
2343 /*
2344 * toUnicode(source -> pivot);
2345 *
2346 * For pivoting conversion; and for direct conversion for
2347 * error callback handling, continuing partial matches
2348 * and flushing the replay buffer.
2349 *
2350 * The pivot buffer is empty and reset.
2351 */
2352 toUArgs.target=pivotStart; /* ==*pivotTarget */
2353 /* toUArgs.targetLimit=pivotLimit; already set before the loop */
2354 _toUnicodeWithCallback(&toUArgs, pErrorCode);
2355 *pivotTarget=toUArgs.target;
2356 if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
2357 /* pivot overflow: continue with the conversion loop */
2358 *pErrorCode=U_ZERO_ERROR;
2359 } else if(U_FAILURE(*pErrorCode) || (!flush && *pivotTarget==pivotStart)) {
2360 /* conversion error, or there was nothing left to convert */
2361 break;
2362 }
2363 /*
2364 * else:
2365 * _toUnicodeWithCallback() wrote into the pivot buffer,
2366 * continue with fromUnicode conversion.
2367 *
2368 * Set the fromUnicode flush flag if we flush and if toUnicode has
2369 * processed the end of the input.
2370 */
2371 if( flush && toUArgs.source==sourceLimit &&
2372 sourceCnv->preToULength>=0 &&
2373 sourceCnv->UCharErrorBufferLength==0
2374 ) {
2375 fromUArgs.flush=true;
2376 }
2377 }
2378
2379 /*
2380 * The conversion loop is exited when one of the following is true:
2381 * - the entire source text has been converted successfully to the target buffer
2382 * - a target buffer overflow occurred
2383 * - a conversion error occurred
2384 */
2385
2386 *source=toUArgs.source;
2387 *target=fromUArgs.target;
2388
2389 /* terminate the target buffer if possible */
2390 if(flush && U_SUCCESS(*pErrorCode)) {
2391 if(*target!=targetLimit) {
2392 **target=0;
2393 if(*pErrorCode==U_STRING_NOT_TERMINATED_WARNING) {
2394 *pErrorCode=U_ZERO_ERROR;
2395 }
2396 } else {
2397 *pErrorCode=U_STRING_NOT_TERMINATED_WARNING;
2398 }
2399 }
2400 }
2401
2402 /* internal implementation of ucnv_convert() etc. with preflighting */
2403 static int32_t
ucnv_internalConvert(UConverter * outConverter,UConverter * inConverter,char * target,int32_t targetCapacity,const char * source,int32_t sourceLength,UErrorCode * pErrorCode)2404 ucnv_internalConvert(UConverter *outConverter, UConverter *inConverter,
2405 char *target, int32_t targetCapacity,
2406 const char *source, int32_t sourceLength,
2407 UErrorCode *pErrorCode) {
2408 char16_t pivotBuffer[CHUNK_SIZE];
2409 char16_t *pivot, *pivot2;
2410
2411 char *myTarget;
2412 const char *sourceLimit;
2413 const char *targetLimit;
2414 int32_t targetLength=0;
2415
2416 /* set up */
2417 if(sourceLength<0) {
2418 sourceLimit=uprv_strchr(source, 0);
2419 } else {
2420 sourceLimit=source+sourceLength;
2421 }
2422
2423 /* if there is no input data, we're done */
2424 if(source==sourceLimit) {
2425 return u_terminateChars(target, targetCapacity, 0, pErrorCode);
2426 }
2427
2428 pivot=pivot2=pivotBuffer;
2429 myTarget=target;
2430 targetLength=0;
2431
2432 if(targetCapacity>0) {
2433 /* perform real conversion */
2434 targetLimit=target+targetCapacity;
2435 ucnv_convertEx(outConverter, inConverter,
2436 &myTarget, targetLimit,
2437 &source, sourceLimit,
2438 pivotBuffer, &pivot, &pivot2, pivotBuffer+CHUNK_SIZE,
2439 false,
2440 true,
2441 pErrorCode);
2442 targetLength=(int32_t)(myTarget-target);
2443 }
2444
2445 /*
2446 * If the output buffer is exhausted (or we are only "preflighting"), we need to stop writing
2447 * to it but continue the conversion in order to store in targetCapacity
2448 * the number of bytes that was required.
2449 */
2450 if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR || targetCapacity==0)
2451 {
2452 char targetBuffer[CHUNK_SIZE];
2453
2454 targetLimit=targetBuffer+CHUNK_SIZE;
2455 do {
2456 *pErrorCode=U_ZERO_ERROR;
2457 myTarget=targetBuffer;
2458 ucnv_convertEx(outConverter, inConverter,
2459 &myTarget, targetLimit,
2460 &source, sourceLimit,
2461 pivotBuffer, &pivot, &pivot2, pivotBuffer+CHUNK_SIZE,
2462 false,
2463 true,
2464 pErrorCode);
2465 targetLength+=(int32_t)(myTarget-targetBuffer);
2466 } while(*pErrorCode==U_BUFFER_OVERFLOW_ERROR);
2467
2468 /* done with preflighting, set warnings and errors as appropriate */
2469 return u_terminateChars(target, targetCapacity, targetLength, pErrorCode);
2470 }
2471
2472 /* no need to call u_terminateChars() because ucnv_convertEx() took care of that */
2473 return targetLength;
2474 }
2475
2476 U_CAPI int32_t U_EXPORT2
ucnv_convert(const char * toConverterName,const char * fromConverterName,char * target,int32_t targetCapacity,const char * source,int32_t sourceLength,UErrorCode * pErrorCode)2477 ucnv_convert(const char *toConverterName, const char *fromConverterName,
2478 char *target, int32_t targetCapacity,
2479 const char *source, int32_t sourceLength,
2480 UErrorCode *pErrorCode) {
2481 UConverter in, out; /* stack-allocated */
2482 UConverter *inConverter, *outConverter;
2483 int32_t targetLength;
2484
2485 if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
2486 return 0;
2487 }
2488
2489 if( source==nullptr || sourceLength<-1 ||
2490 targetCapacity<0 || (targetCapacity>0 && target==nullptr)
2491 ) {
2492 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
2493 return 0;
2494 }
2495
2496 /* if there is no input data, we're done */
2497 if(sourceLength==0 || (sourceLength<0 && *source==0)) {
2498 return u_terminateChars(target, targetCapacity, 0, pErrorCode);
2499 }
2500
2501 /* create the converters */
2502 inConverter=ucnv_createConverter(&in, fromConverterName, pErrorCode);
2503 if(U_FAILURE(*pErrorCode)) {
2504 return 0;
2505 }
2506
2507 outConverter=ucnv_createConverter(&out, toConverterName, pErrorCode);
2508 if(U_FAILURE(*pErrorCode)) {
2509 ucnv_close(inConverter);
2510 return 0;
2511 }
2512
2513 targetLength=ucnv_internalConvert(outConverter, inConverter,
2514 target, targetCapacity,
2515 source, sourceLength,
2516 pErrorCode);
2517
2518 ucnv_close(inConverter);
2519 ucnv_close(outConverter);
2520
2521 return targetLength;
2522 }
2523
2524 /* @internal */
2525 static int32_t
ucnv_convertAlgorithmic(UBool convertToAlgorithmic,UConverterType algorithmicType,UConverter * cnv,char * target,int32_t targetCapacity,const char * source,int32_t sourceLength,UErrorCode * pErrorCode)2526 ucnv_convertAlgorithmic(UBool convertToAlgorithmic,
2527 UConverterType algorithmicType,
2528 UConverter *cnv,
2529 char *target, int32_t targetCapacity,
2530 const char *source, int32_t sourceLength,
2531 UErrorCode *pErrorCode) {
2532 UConverter algoConverterStatic; /* stack-allocated */
2533 UConverter *algoConverter, *to, *from;
2534 int32_t targetLength;
2535
2536 if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
2537 return 0;
2538 }
2539
2540 if( cnv==nullptr || source==nullptr || sourceLength<-1 ||
2541 targetCapacity<0 || (targetCapacity>0 && target==nullptr)
2542 ) {
2543 *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
2544 return 0;
2545 }
2546
2547 /* if there is no input data, we're done */
2548 if(sourceLength==0 || (sourceLength<0 && *source==0)) {
2549 return u_terminateChars(target, targetCapacity, 0, pErrorCode);
2550 }
2551
2552 /* create the algorithmic converter */
2553 algoConverter=ucnv_createAlgorithmicConverter(&algoConverterStatic, algorithmicType,
2554 "", 0, pErrorCode);
2555 if(U_FAILURE(*pErrorCode)) {
2556 return 0;
2557 }
2558
2559 /* reset the other converter */
2560 if(convertToAlgorithmic) {
2561 /* cnv->Unicode->algo */
2562 ucnv_resetToUnicode(cnv);
2563 to=algoConverter;
2564 from=cnv;
2565 } else {
2566 /* algo->Unicode->cnv */
2567 ucnv_resetFromUnicode(cnv);
2568 from=algoConverter;
2569 to=cnv;
2570 }
2571
2572 targetLength=ucnv_internalConvert(to, from,
2573 target, targetCapacity,
2574 source, sourceLength,
2575 pErrorCode);
2576
2577 ucnv_close(algoConverter);
2578
2579 return targetLength;
2580 }
2581
2582 U_CAPI int32_t U_EXPORT2
ucnv_toAlgorithmic(UConverterType algorithmicType,UConverter * cnv,char * target,int32_t targetCapacity,const char * source,int32_t sourceLength,UErrorCode * pErrorCode)2583 ucnv_toAlgorithmic(UConverterType algorithmicType,
2584 UConverter *cnv,
2585 char *target, int32_t targetCapacity,
2586 const char *source, int32_t sourceLength,
2587 UErrorCode *pErrorCode) {
2588 return ucnv_convertAlgorithmic(true, algorithmicType, cnv,
2589 target, targetCapacity,
2590 source, sourceLength,
2591 pErrorCode);
2592 }
2593
2594 U_CAPI int32_t U_EXPORT2
ucnv_fromAlgorithmic(UConverter * cnv,UConverterType algorithmicType,char * target,int32_t targetCapacity,const char * source,int32_t sourceLength,UErrorCode * pErrorCode)2595 ucnv_fromAlgorithmic(UConverter *cnv,
2596 UConverterType algorithmicType,
2597 char *target, int32_t targetCapacity,
2598 const char *source, int32_t sourceLength,
2599 UErrorCode *pErrorCode) UPRV_NO_SANITIZE_UNDEFINED {
2600
2601 if(algorithmicType<0 || UCNV_NUMBER_OF_SUPPORTED_CONVERTER_TYPES<=algorithmicType) {
2602 *pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
2603 return 0;
2604 }
2605 return ucnv_convertAlgorithmic(false, algorithmicType, cnv,
2606 target, targetCapacity,
2607 source, sourceLength,
2608 pErrorCode);
2609 }
2610
2611 U_CAPI UConverterType U_EXPORT2
ucnv_getType(const UConverter * converter)2612 ucnv_getType(const UConverter* converter)
2613 {
2614 int8_t type = converter->sharedData->staticData->conversionType;
2615 #if !UCONFIG_NO_LEGACY_CONVERSION
2616 if(type == UCNV_MBCS) {
2617 return ucnv_MBCSGetType(converter);
2618 }
2619 #endif
2620 return (UConverterType)type;
2621 }
2622
2623 U_CAPI void U_EXPORT2
ucnv_getStarters(const UConverter * converter,UBool starters[256],UErrorCode * err)2624 ucnv_getStarters(const UConverter* converter,
2625 UBool starters[256],
2626 UErrorCode* err)
2627 {
2628 if (err == nullptr || U_FAILURE(*err)) {
2629 return;
2630 }
2631
2632 if(converter->sharedData->impl->getStarters != nullptr) {
2633 converter->sharedData->impl->getStarters(converter, starters, err);
2634 } else {
2635 *err = U_ILLEGAL_ARGUMENT_ERROR;
2636 }
2637 }
2638
ucnv_getAmbiguous(const UConverter * cnv)2639 static const UAmbiguousConverter *ucnv_getAmbiguous(const UConverter *cnv)
2640 {
2641 UErrorCode errorCode;
2642 const char *name;
2643 int32_t i;
2644
2645 if(cnv==nullptr) {
2646 return nullptr;
2647 }
2648
2649 errorCode=U_ZERO_ERROR;
2650 name=ucnv_getName(cnv, &errorCode);
2651 if(U_FAILURE(errorCode)) {
2652 return nullptr;
2653 }
2654
2655 for(i=0; i<UPRV_LENGTHOF(ambiguousConverters); ++i)
2656 {
2657 if(0==uprv_strcmp(name, ambiguousConverters[i].name))
2658 {
2659 return ambiguousConverters+i;
2660 }
2661 }
2662
2663 return nullptr;
2664 }
2665
2666 U_CAPI void U_EXPORT2
ucnv_fixFileSeparator(const UConverter * cnv,char16_t * source,int32_t sourceLength)2667 ucnv_fixFileSeparator(const UConverter *cnv,
2668 char16_t* source,
2669 int32_t sourceLength) {
2670 const UAmbiguousConverter *a;
2671 int32_t i;
2672 char16_t variant5c;
2673
2674 if(cnv==nullptr || source==nullptr || sourceLength<=0 || (a=ucnv_getAmbiguous(cnv))==nullptr)
2675 {
2676 return;
2677 }
2678
2679 variant5c=a->variant5c;
2680 for(i=0; i<sourceLength; ++i) {
2681 if(source[i]==variant5c) {
2682 source[i]=0x5c;
2683 }
2684 }
2685 }
2686
2687 U_CAPI UBool U_EXPORT2
ucnv_isAmbiguous(const UConverter * cnv)2688 ucnv_isAmbiguous(const UConverter *cnv) {
2689 return (UBool)(ucnv_getAmbiguous(cnv)!=nullptr);
2690 }
2691
2692 U_CAPI void U_EXPORT2
ucnv_setFallback(UConverter * cnv,UBool usesFallback)2693 ucnv_setFallback(UConverter *cnv, UBool usesFallback)
2694 {
2695 cnv->useFallback = usesFallback;
2696 }
2697
2698 U_CAPI UBool U_EXPORT2
ucnv_usesFallback(const UConverter * cnv)2699 ucnv_usesFallback(const UConverter *cnv)
2700 {
2701 return cnv->useFallback;
2702 }
2703
2704 U_CAPI void U_EXPORT2
ucnv_getInvalidChars(const UConverter * converter,char * errBytes,int8_t * len,UErrorCode * err)2705 ucnv_getInvalidChars (const UConverter * converter,
2706 char *errBytes,
2707 int8_t * len,
2708 UErrorCode * err)
2709 {
2710 if (err == nullptr || U_FAILURE(*err))
2711 {
2712 return;
2713 }
2714 if (len == nullptr || errBytes == nullptr || converter == nullptr)
2715 {
2716 *err = U_ILLEGAL_ARGUMENT_ERROR;
2717 return;
2718 }
2719 if (*len < converter->invalidCharLength)
2720 {
2721 *err = U_INDEX_OUTOFBOUNDS_ERROR;
2722 return;
2723 }
2724 if ((*len = converter->invalidCharLength) > 0)
2725 {
2726 uprv_memcpy (errBytes, converter->invalidCharBuffer, *len);
2727 }
2728 }
2729
2730 U_CAPI void U_EXPORT2
ucnv_getInvalidUChars(const UConverter * converter,char16_t * errChars,int8_t * len,UErrorCode * err)2731 ucnv_getInvalidUChars (const UConverter * converter,
2732 char16_t *errChars,
2733 int8_t * len,
2734 UErrorCode * err)
2735 {
2736 if (err == nullptr || U_FAILURE(*err))
2737 {
2738 return;
2739 }
2740 if (len == nullptr || errChars == nullptr || converter == nullptr)
2741 {
2742 *err = U_ILLEGAL_ARGUMENT_ERROR;
2743 return;
2744 }
2745 if (*len < converter->invalidUCharLength)
2746 {
2747 *err = U_INDEX_OUTOFBOUNDS_ERROR;
2748 return;
2749 }
2750 if ((*len = converter->invalidUCharLength) > 0)
2751 {
2752 u_memcpy (errChars, converter->invalidUCharBuffer, *len);
2753 }
2754 }
2755
2756 #define SIG_MAX_LEN 5
2757
2758 U_CAPI const char* U_EXPORT2
ucnv_detectUnicodeSignature(const char * source,int32_t sourceLength,int32_t * signatureLength,UErrorCode * pErrorCode)2759 ucnv_detectUnicodeSignature( const char* source,
2760 int32_t sourceLength,
2761 int32_t* signatureLength,
2762 UErrorCode* pErrorCode) {
2763 int32_t dummy;
2764
2765 /* initial 0xa5 bytes: make sure that if we read <SIG_MAX_LEN
2766 * bytes we don't misdetect something
2767 */
2768 char start[SIG_MAX_LEN]={ '\xa5', '\xa5', '\xa5', '\xa5', '\xa5' };
2769 int i = 0;
2770
2771 if((pErrorCode==nullptr) || U_FAILURE(*pErrorCode)){
2772 return nullptr;
2773 }
2774
2775 if(source == nullptr || sourceLength < -1){
2776 *pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
2777 return nullptr;
2778 }
2779
2780 if(signatureLength == nullptr) {
2781 signatureLength = &dummy;
2782 }
2783
2784 if(sourceLength==-1){
2785 sourceLength=(int32_t)uprv_strlen(source);
2786 }
2787
2788
2789 while(i<sourceLength&& i<SIG_MAX_LEN){
2790 start[i]=source[i];
2791 i++;
2792 }
2793
2794 if(start[0] == '\xFE' && start[1] == '\xFF') {
2795 *signatureLength=2;
2796 return "UTF-16BE";
2797 } else if(start[0] == '\xFF' && start[1] == '\xFE') {
2798 if(start[2] == '\x00' && start[3] =='\x00') {
2799 *signatureLength=4;
2800 return "UTF-32LE";
2801 } else {
2802 *signatureLength=2;
2803 return "UTF-16LE";
2804 }
2805 } else if(start[0] == '\xEF' && start[1] == '\xBB' && start[2] == '\xBF') {
2806 *signatureLength=3;
2807 return "UTF-8";
2808 } else if(start[0] == '\x00' && start[1] == '\x00' &&
2809 start[2] == '\xFE' && start[3]=='\xFF') {
2810 *signatureLength=4;
2811 return "UTF-32BE";
2812 } else if(start[0] == '\x0E' && start[1] == '\xFE' && start[2] == '\xFF') {
2813 *signatureLength=3;
2814 return "SCSU";
2815 } else if(start[0] == '\xFB' && start[1] == '\xEE' && start[2] == '\x28') {
2816 *signatureLength=3;
2817 return "BOCU-1";
2818 } else if(start[0] == '\x2B' && start[1] == '\x2F' && start[2] == '\x76') {
2819 /*
2820 * UTF-7: Initial U+FEFF is encoded as +/v8 or +/v9 or +/v+ or +/v/
2821 * depending on the second UTF-16 code unit.
2822 * Detect the entire, closed Unicode mode sequence +/v8- for only U+FEFF
2823 * if it occurs.
2824 *
2825 * So far we have +/v
2826 */
2827 if(start[3] == '\x38' && start[4] == '\x2D') {
2828 /* 5 bytes +/v8- */
2829 *signatureLength=5;
2830 return "UTF-7";
2831 } else if(start[3] == '\x38' || start[3] == '\x39' || start[3] == '\x2B' || start[3] == '\x2F') {
2832 /* 4 bytes +/v8 or +/v9 or +/v+ or +/v/ */
2833 *signatureLength=4;
2834 return "UTF-7";
2835 }
2836 }else if(start[0]=='\xDD' && start[1]== '\x73'&& start[2]=='\x66' && start[3]=='\x73'){
2837 *signatureLength=4;
2838 return "UTF-EBCDIC";
2839 }
2840
2841
2842 /* no known Unicode signature byte sequence recognized */
2843 *signatureLength=0;
2844 return nullptr;
2845 }
2846
2847 U_CAPI int32_t U_EXPORT2
ucnv_fromUCountPending(const UConverter * cnv,UErrorCode * status)2848 ucnv_fromUCountPending(const UConverter* cnv, UErrorCode* status)
2849 {
2850 if(status == nullptr || U_FAILURE(*status)){
2851 return -1;
2852 }
2853 if(cnv == nullptr){
2854 *status = U_ILLEGAL_ARGUMENT_ERROR;
2855 return -1;
2856 }
2857
2858 if(cnv->preFromUFirstCP >= 0){
2859 return U16_LENGTH(cnv->preFromUFirstCP)+cnv->preFromULength ;
2860 }else if(cnv->preFromULength < 0){
2861 return -cnv->preFromULength ;
2862 }else if(cnv->fromUChar32 > 0){
2863 return 1;
2864 }
2865 return 0;
2866
2867 }
2868
2869 U_CAPI int32_t U_EXPORT2
ucnv_toUCountPending(const UConverter * cnv,UErrorCode * status)2870 ucnv_toUCountPending(const UConverter* cnv, UErrorCode* status){
2871
2872 if(status == nullptr || U_FAILURE(*status)){
2873 return -1;
2874 }
2875 if(cnv == nullptr){
2876 *status = U_ILLEGAL_ARGUMENT_ERROR;
2877 return -1;
2878 }
2879
2880 if(cnv->preToULength > 0){
2881 return cnv->preToULength ;
2882 }else if(cnv->preToULength < 0){
2883 return -cnv->preToULength;
2884 }else if(cnv->toULength > 0){
2885 return cnv->toULength;
2886 }
2887 return 0;
2888 }
2889
2890 U_CAPI UBool U_EXPORT2
ucnv_isFixedWidth(UConverter * cnv,UErrorCode * status)2891 ucnv_isFixedWidth(UConverter *cnv, UErrorCode *status){
2892 if (U_FAILURE(*status)) {
2893 return false;
2894 }
2895
2896 if (cnv == nullptr) {
2897 *status = U_ILLEGAL_ARGUMENT_ERROR;
2898 return false;
2899 }
2900
2901 switch (ucnv_getType(cnv)) {
2902 case UCNV_SBCS:
2903 case UCNV_DBCS:
2904 case UCNV_UTF32_BigEndian:
2905 case UCNV_UTF32_LittleEndian:
2906 case UCNV_UTF32:
2907 case UCNV_US_ASCII:
2908 return true;
2909 default:
2910 return false;
2911 }
2912 }
2913 #endif
2914
2915 /*
2916 * Hey, Emacs, please set the following:
2917 *
2918 * Local Variables:
2919 * indent-tabs-mode: nil
2920 * End:
2921 *
2922 */
2923