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