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comparison: intl/icu/source/common/ucnv_bld.cpp

intl/icu/source/common/ucnv_bld.cpp

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1 /*
2 ********************************************************************
3 * COPYRIGHT:
4 * Copyright (c) 1996-2013, International Business Machines Corporation and
5 * others. All Rights Reserved.
6 ********************************************************************
7 *
8 * uconv_bld.cpp:
9 *
10 * Defines functions that are used in the creation/initialization/deletion
11 * of converters and related structures.
12 * uses uconv_io.h routines to access disk information
13 * is used by ucnv.h to implement public API create/delete/flushCache routines
14 * Modification History:
15 *
16 * Date Name Description
17 *
18 * 06/20/2000 helena OS/400 port changes; mostly typecast.
19 * 06/29/2000 helena Major rewrite of the callback interface.
20 */
21
22 #include "unicode/utypes.h"
23
24 #if !UCONFIG_NO_CONVERSION
25
26 #include "unicode/putil.h"
27 #include "unicode/udata.h"
28 #include "unicode/ucnv.h"
29 #include "unicode/uloc.h"
30 #include "mutex.h"
31 #include "putilimp.h"
32 #include "uassert.h"
33 #include "utracimp.h"
34 #include "ucnv_io.h"
35 #include "ucnv_bld.h"
36 #include "ucnvmbcs.h"
37 #include "ucnv_ext.h"
38 #include "ucnv_cnv.h"
39 #include "ucnv_imp.h"
40 #include "uhash.h"
41 #include "umutex.h"
42 #include "cstring.h"
43 #include "cmemory.h"
44 #include "ucln_cmn.h"
45 #include "ustr_cnv.h"
46
47
48 #if 0
49 #include <stdio.h>
50 extern void UCNV_DEBUG_LOG(char *what, char *who, void *p, int l);
51 #define UCNV_DEBUG_LOG(x,y,z) UCNV_DEBUG_LOG(x,y,z,__LINE__)
52 #else
53 # define UCNV_DEBUG_LOG(x,y,z)
54 #endif
55
56 static const UConverterSharedData * const
57 converterData[UCNV_NUMBER_OF_SUPPORTED_CONVERTER_TYPES]={
58 NULL, NULL,
59
60 #if UCONFIG_NO_LEGACY_CONVERSION
61 NULL,
62 #else
63 &_MBCSData,
64 #endif
65
66 &_Latin1Data,
67 &_UTF8Data, &_UTF16BEData, &_UTF16LEData, &_UTF32BEData, &_UTF32LEData,
68 NULL,
69
70 #if UCONFIG_NO_LEGACY_CONVERSION
71 NULL,
72 NULL, NULL, NULL, NULL, NULL, NULL,
73 NULL, NULL, NULL, NULL, NULL, NULL,
74 NULL,
75 #else
76 &_ISO2022Data,
77 &_LMBCSData1,&_LMBCSData2, &_LMBCSData3, &_LMBCSData4, &_LMBCSData5, &_LMBCSData6,
78 &_LMBCSData8,&_LMBCSData11,&_LMBCSData16,&_LMBCSData17,&_LMBCSData18,&_LMBCSData19,
79 &_HZData,
80 #endif
81
82 &_SCSUData,
83
84 #if UCONFIG_NO_LEGACY_CONVERSION
85 NULL,
86 #else
87 &_ISCIIData,
88 #endif
89
90 &_ASCIIData,
91 &_UTF7Data, &_Bocu1Data, &_UTF16Data, &_UTF32Data, &_CESU8Data, &_IMAPData,
92
93 #if UCONFIG_NO_LEGACY_CONVERSION
94 NULL,
95 #else
96 &_CompoundTextData
97 #endif
98 };
99
100 /* Please keep this in binary sorted order for getAlgorithmicTypeFromName.
101 Also the name should be in lower case and all spaces, dashes and underscores
102 removed
103 */
104 static struct {
105 const char *name;
106 const UConverterType type;
107 } const cnvNameType[] = {
108 { "bocu1", UCNV_BOCU1 },
109 { "cesu8", UCNV_CESU8 },
110 #if !UCONFIG_NO_LEGACY_CONVERSION
111 { "hz",UCNV_HZ },
112 #endif
113 { "imapmailboxname", UCNV_IMAP_MAILBOX },
114 #if !UCONFIG_NO_LEGACY_CONVERSION
115 { "iscii", UCNV_ISCII },
116 { "iso2022", UCNV_ISO_2022 },
117 #endif
118 { "iso88591", UCNV_LATIN_1 },
119 #if !UCONFIG_NO_LEGACY_CONVERSION
120 { "lmbcs1", UCNV_LMBCS_1 },
121 { "lmbcs11",UCNV_LMBCS_11 },
122 { "lmbcs16",UCNV_LMBCS_16 },
123 { "lmbcs17",UCNV_LMBCS_17 },
124 { "lmbcs18",UCNV_LMBCS_18 },
125 { "lmbcs19",UCNV_LMBCS_19 },
126 { "lmbcs2", UCNV_LMBCS_2 },
127 { "lmbcs3", UCNV_LMBCS_3 },
128 { "lmbcs4", UCNV_LMBCS_4 },
129 { "lmbcs5", UCNV_LMBCS_5 },
130 { "lmbcs6", UCNV_LMBCS_6 },
131 { "lmbcs8", UCNV_LMBCS_8 },
132 #endif
133 { "scsu", UCNV_SCSU },
134 { "usascii", UCNV_US_ASCII },
135 { "utf16", UCNV_UTF16 },
136 { "utf16be", UCNV_UTF16_BigEndian },
137 { "utf16le", UCNV_UTF16_LittleEndian },
138 #if U_IS_BIG_ENDIAN
139 { "utf16oppositeendian", UCNV_UTF16_LittleEndian },
140 { "utf16platformendian", UCNV_UTF16_BigEndian },
141 #else
142 { "utf16oppositeendian", UCNV_UTF16_BigEndian},
143 { "utf16platformendian", UCNV_UTF16_LittleEndian },
144 #endif
145 { "utf32", UCNV_UTF32 },
146 { "utf32be", UCNV_UTF32_BigEndian },
147 { "utf32le", UCNV_UTF32_LittleEndian },
148 #if U_IS_BIG_ENDIAN
149 { "utf32oppositeendian", UCNV_UTF32_LittleEndian },
150 { "utf32platformendian", UCNV_UTF32_BigEndian },
151 #else
152 { "utf32oppositeendian", UCNV_UTF32_BigEndian },
153 { "utf32platformendian", UCNV_UTF32_LittleEndian },
154 #endif
155 { "utf7", UCNV_UTF7 },
156 { "utf8", UCNV_UTF8 },
157 { "x11compoundtext", UCNV_COMPOUND_TEXT}
158 };
159
160
161 /*initializes some global variables */
162 static UHashtable *SHARED_DATA_HASHTABLE = NULL;
163 static UMutex cnvCacheMutex = U_MUTEX_INITIALIZER; /* Mutex for synchronizing cnv cache access. */
164 /* Note: the global mutex is used for */
165 /* reference count updates. */
166
167 static const char **gAvailableConverters = NULL;
168 static uint16_t gAvailableConverterCount = 0;
169 static icu::UInitOnce gAvailableConvertersInitOnce = U_INITONCE_INITIALIZER;
170
171 #if !U_CHARSET_IS_UTF8
172
173 /* This contains the resolved converter name. So no further alias lookup is needed again. */
174 static char gDefaultConverterNameBuffer[UCNV_MAX_CONVERTER_NAME_LENGTH + 1]; /* +1 for NULL */
175 static const char *gDefaultConverterName = NULL;
176
177 /*
178 If the default converter is an algorithmic converter, this is the cached value.
179 We don't cache a full UConverter and clone it because ucnv_clone doesn't have
180 less overhead than an algorithmic open. We don't cache non-algorithmic converters
181 because ucnv_flushCache must be able to unload the default converter and its table.
182 */
183 static const UConverterSharedData *gDefaultAlgorithmicSharedData = NULL;
184
185 /* Does gDefaultConverterName have a converter option and require extra parsing? */
186 static UBool gDefaultConverterContainsOption;
187
188 #endif /* !U_CHARSET_IS_UTF8 */
189
190 static const char DATA_TYPE[] = "cnv";
191
192 /* ucnv_flushAvailableConverterCache. This is only called from ucnv_cleanup().
193 * If it is ever to be called from elsewhere, synchronization
194 * will need to be considered.
195 */
196 static void
197 ucnv_flushAvailableConverterCache() {
198 gAvailableConverterCount = 0;
199 if (gAvailableConverters) {
200 uprv_free((char **)gAvailableConverters);
201 gAvailableConverters = NULL;
202 }
203 gAvailableConvertersInitOnce.reset();
204 }
205
206 /* ucnv_cleanup - delete all storage held by the converter cache, except any */
207 /* in use by open converters. */
208 /* Not thread safe. */
209 /* Not supported API. */
210 static UBool U_CALLCONV ucnv_cleanup(void) {
211 ucnv_flushCache();
212 if (SHARED_DATA_HASHTABLE != NULL && uhash_count(SHARED_DATA_HASHTABLE) == 0) {
213 uhash_close(SHARED_DATA_HASHTABLE);
214 SHARED_DATA_HASHTABLE = NULL;
215 }
216
217 /* Isn't called from flushCache because other threads may have preexisting references to the table. */
218 ucnv_flushAvailableConverterCache();
219
220 #if !U_CHARSET_IS_UTF8
221 gDefaultConverterName = NULL;
222 gDefaultConverterNameBuffer[0] = 0;
223 gDefaultConverterContainsOption = FALSE;
224 gDefaultAlgorithmicSharedData = NULL;
225 #endif
226
227 return (SHARED_DATA_HASHTABLE == NULL);
228 }
229
230 static UBool U_CALLCONV
231 isCnvAcceptable(void * /*context*/,
232 const char * /*type*/, const char * /*name*/,
233 const UDataInfo *pInfo) {
234 return (UBool)(
235 pInfo->size>=20 &&
236 pInfo->isBigEndian==U_IS_BIG_ENDIAN &&
237 pInfo->charsetFamily==U_CHARSET_FAMILY &&
238 pInfo->sizeofUChar==U_SIZEOF_UCHAR &&
239 pInfo->dataFormat[0]==0x63 && /* dataFormat="cnvt" */
240 pInfo->dataFormat[1]==0x6e &&
241 pInfo->dataFormat[2]==0x76 &&
242 pInfo->dataFormat[3]==0x74 &&
243 pInfo->formatVersion[0]==6); /* Everything will be version 6 */
244 }
245
246 /**
247 * Un flatten shared data from a UDATA..
248 */
249 static UConverterSharedData*
250 ucnv_data_unFlattenClone(UConverterLoadArgs *pArgs, UDataMemory *pData, UErrorCode *status)
251 {
252 /* UDataInfo info; -- necessary only if some converters have different formatVersion */
253 const uint8_t *raw = (const uint8_t *)udata_getMemory(pData);
254 const UConverterStaticData *source = (const UConverterStaticData *) raw;
255 UConverterSharedData *data;
256 UConverterType type = (UConverterType)source->conversionType;
257
258 if(U_FAILURE(*status))
259 return NULL;
260
261 if( (uint16_t)type >= UCNV_NUMBER_OF_SUPPORTED_CONVERTER_TYPES ||
262 converterData[type] == NULL ||
263 converterData[type]->referenceCounter != 1 ||
264 source->structSize != sizeof(UConverterStaticData))
265 {
266 *status = U_INVALID_TABLE_FORMAT;
267 return NULL;
268 }
269
270 data = (UConverterSharedData *)uprv_malloc(sizeof(UConverterSharedData));
271 if(data == NULL) {
272 *status = U_MEMORY_ALLOCATION_ERROR;
273 return NULL;
274 }
275
276 /* copy initial values from the static structure for this type */
277 uprv_memcpy(data, converterData[type], sizeof(UConverterSharedData));
278
279 #if 0 /* made UConverterMBCSTable part of UConverterSharedData -- markus 20031107 */
280 /*
281 * It would be much more efficient if the table were a direct member, not a pointer.
282 * However, that would add to the size of all UConverterSharedData objects
283 * even if they do not use this table (especially algorithmic ones).
284 * If this changes, then the static templates from converterData[type]
285 * need more entries.
286 *
287 * In principle, it would be cleaner if the load() function below
288 * allocated the table.
289 */
290 data->table = (UConverterTable *)uprv_malloc(sizeof(UConverterTable));
291 if(data->table == NULL) {
292 uprv_free(data);
293 *status = U_MEMORY_ALLOCATION_ERROR;
294 return NULL;
295 }
296 uprv_memset(data->table, 0, sizeof(UConverterTable));
297 #endif
298
299 data->staticData = source;
300
301 data->sharedDataCached = FALSE;
302
303 /* fill in fields from the loaded data */
304 data->dataMemory = (void*)pData; /* for future use */
305
306 if(data->impl->load != NULL) {
307 data->impl->load(data, pArgs, raw + source->structSize, status);
308 if(U_FAILURE(*status)) {
309 uprv_free(data->table);
310 uprv_free(data);
311 return NULL;
312 }
313 }
314 return data;
315 }
316
317 /*Takes an alias name gets an actual converter file name
318 *goes to disk and opens it.
319 *allocates the memory and returns a new UConverter object
320 */
321 static UConverterSharedData *createConverterFromFile(UConverterLoadArgs *pArgs, UErrorCode * err)
322 {
323 UDataMemory *data;
324 UConverterSharedData *sharedData;
325
326 UTRACE_ENTRY_OC(UTRACE_UCNV_LOAD);
327
328 if (U_FAILURE (*err)) {
329 UTRACE_EXIT_STATUS(*err);
330 return NULL;
331 }
332
333 UTRACE_DATA2(UTRACE_OPEN_CLOSE, "load converter %s from package %s", pArgs->name, pArgs->pkg);
334
335 data = udata_openChoice(pArgs->pkg, DATA_TYPE, pArgs->name, isCnvAcceptable, NULL, err);
336 if(U_FAILURE(*err))
337 {
338 UTRACE_EXIT_STATUS(*err);
339 return NULL;
340 }
341
342 sharedData = ucnv_data_unFlattenClone(pArgs, data, err);
343 if(U_FAILURE(*err))
344 {
345 udata_close(data);
346 UTRACE_EXIT_STATUS(*err);
347 return NULL;
348 }
349
350 /*
351 * TODO Store pkg in a field in the shared data so that delta-only converters
352 * can load base converters from the same package.
353 * If the pkg name is longer than the field, then either do not load the converter
354 * in the first place, or just set the pkg field to "".
355 */
356
357 UTRACE_EXIT_PTR_STATUS(sharedData, *err);
358 return sharedData;
359 }
360
361 /*returns a converter type from a string
362 */
363 static const UConverterSharedData *
364 getAlgorithmicTypeFromName(const char *realName)
365 {
366 uint32_t mid, start, limit;
367 uint32_t lastMid;
368 int result;
369 char strippedName[UCNV_MAX_CONVERTER_NAME_LENGTH];
370
371 /* Lower case and remove ignoreable characters. */
372 ucnv_io_stripForCompare(strippedName, realName);
373
374 /* do a binary search for the alias */
375 start = 0;
376 limit = sizeof(cnvNameType)/sizeof(cnvNameType[0]);
377 mid = limit;
378 lastMid = UINT32_MAX;
379
380 for (;;) {
381 mid = (uint32_t)((start + limit) / 2);
382 if (lastMid == mid) { /* Have we moved? */
383 break; /* We haven't moved, and it wasn't found. */
384 }
385 lastMid = mid;
386 result = uprv_strcmp(strippedName, cnvNameType[mid].name);
387
388 if (result < 0) {
389 limit = mid;
390 } else if (result > 0) {
391 start = mid;
392 } else {
393 return converterData[cnvNameType[mid].type];
394 }
395 }
396
397 return NULL;
398 }
399
400 /*
401 * Based on the number of known converters, this determines how many times larger
402 * the shared data hash table should be. When on small platforms, or just a couple
403 * of converters are used, this number should be 2. When memory is plentiful, or
404 * when ucnv_countAvailable is ever used with a lot of available converters,
405 * this should be 4.
406 * Larger numbers reduce the number of hash collisions, but use more memory.
407 */
408 #define UCNV_CACHE_LOAD_FACTOR 2
409
410 /* Puts the shared data in the static hashtable SHARED_DATA_HASHTABLE */
411 /* Will always be called with the cnvCacheMutex alrady being held */
412 /* by the calling function. */
413 /* Stores the shared data in the SHARED_DATA_HASHTABLE
414 * @param data The shared data
415 */
416 static void
417 ucnv_shareConverterData(UConverterSharedData * data)
418 {
419 UErrorCode err = U_ZERO_ERROR;
420 /*Lazy evaluates the Hashtable itself */
421 /*void *sanity = NULL;*/
422
423 if (SHARED_DATA_HASHTABLE == NULL)
424 {
425 SHARED_DATA_HASHTABLE = uhash_openSize(uhash_hashChars, uhash_compareChars, NULL,
426 ucnv_io_countKnownConverters(&err)*UCNV_CACHE_LOAD_FACTOR,
427 &err);
428 ucln_common_registerCleanup(UCLN_COMMON_UCNV, ucnv_cleanup);
429
430 if (U_FAILURE(err))
431 return;
432 }
433
434 /* ### check to see if the element is not already there! */
435
436 /*
437 sanity = ucnv_getSharedConverterData (data->staticData->name);
438 if(sanity != NULL)
439 {
440 UCNV_DEBUG_LOG("put:overwrite!",data->staticData->name,sanity);
441 }
442 UCNV_DEBUG_LOG("put:chk",data->staticData->name,sanity);
443 */
444
445 /* Mark it shared */
446 data->sharedDataCached = TRUE;
447
448 uhash_put(SHARED_DATA_HASHTABLE,
449 (void*) data->staticData->name, /* Okay to cast away const as long as
450 keyDeleter == NULL */
451 data,
452 &err);
453 UCNV_DEBUG_LOG("put", data->staticData->name,data);
454
455 }
456
457 /* Look up a converter name in the shared data cache. */
458 /* cnvCacheMutex must be held by the caller to protect the hash table. */
459 /* gets the shared data from the SHARED_DATA_HASHTABLE (might return NULL if it isn't there)
460 * @param name The name of the shared data
461 * @return the shared data from the SHARED_DATA_HASHTABLE
462 */
463 static UConverterSharedData *
464 ucnv_getSharedConverterData(const char *name)
465 {
466 /*special case when no Table has yet been created we return NULL */
467 if (SHARED_DATA_HASHTABLE == NULL)
468 {
469 return NULL;
470 }
471 else
472 {
473 UConverterSharedData *rc;
474
475 rc = (UConverterSharedData*)uhash_get(SHARED_DATA_HASHTABLE, name);
476 UCNV_DEBUG_LOG("get",name,rc);
477 return rc;
478 }
479 }
480
481 /*frees the string of memory blocks associates with a sharedConverter
482 *if and only if the referenceCounter == 0
483 */
484 /* Deletes (frees) the Shared data it's passed. first it checks the referenceCounter to
485 * see if anyone is using it, if not it frees all the memory stemming from sharedConverterData and
486 * returns TRUE,
487 * otherwise returns FALSE
488 * @param sharedConverterData The shared data
489 * @return if not it frees all the memory stemming from sharedConverterData and
490 * returns TRUE, otherwise returns FALSE
491 */
492 static UBool
493 ucnv_deleteSharedConverterData(UConverterSharedData * deadSharedData)
494 {
495 UTRACE_ENTRY_OC(UTRACE_UCNV_UNLOAD);
496 UTRACE_DATA2(UTRACE_OPEN_CLOSE, "unload converter %s shared data %p", deadSharedData->staticData->name, deadSharedData);
497
498 if (deadSharedData->referenceCounter > 0) {
499 UTRACE_EXIT_VALUE((int32_t)FALSE);
500 return FALSE;
501 }
502
503 if (deadSharedData->impl->unload != NULL) {
504 deadSharedData->impl->unload(deadSharedData);
505 }
506
507 if(deadSharedData->dataMemory != NULL)
508 {
509 UDataMemory *data = (UDataMemory*)deadSharedData->dataMemory;
510 udata_close(data);
511 }
512
513 if(deadSharedData->table != NULL)
514 {
515 uprv_free(deadSharedData->table);
516 }
517
518 #if 0
519 /* if the static data is actually owned by the shared data */
520 /* enable if we ever have this situation. */
521 if(deadSharedData->staticDataOwned == TRUE) /* see ucnv_bld.h */
522 {
523 uprv_free((void*)deadSharedData->staticData);
524 }
525 #endif
526
527 #if 0
528 /* Zap it ! */
529 uprv_memset(deadSharedData->0, sizeof(*deadSharedData));
530 #endif
531
532 uprv_free(deadSharedData);
533
534 UTRACE_EXIT_VALUE((int32_t)TRUE);
535 return TRUE;
536 }
537
538 /**
539 * Load a non-algorithmic converter.
540 * If pkg==NULL, then this function must be called inside umtx_lock(&cnvCacheMutex).
541 */
542 UConverterSharedData *
543 ucnv_load(UConverterLoadArgs *pArgs, UErrorCode *err) {
544 UConverterSharedData *mySharedConverterData;
545
546 if(err == NULL || U_FAILURE(*err)) {
547 return NULL;
548 }
549
550 if(pArgs->pkg != NULL && *pArgs->pkg != 0) {
551 /* application-provided converters are not currently cached */
552 return createConverterFromFile(pArgs, err);
553 }
554
555 mySharedConverterData = ucnv_getSharedConverterData(pArgs->name);
556 if (mySharedConverterData == NULL)
557 {
558 /*Not cached, we need to stream it in from file */
559 mySharedConverterData = createConverterFromFile(pArgs, err);
560 if (U_FAILURE (*err) || (mySharedConverterData == NULL))
561 {
562 return NULL;
563 }
564 else if (!pArgs->onlyTestIsLoadable)
565 {
566 /* share it with other library clients */
567 ucnv_shareConverterData(mySharedConverterData);
568 }
569 }
570 else
571 {
572 /* The data for this converter was already in the cache. */
573 /* Update the reference counter on the shared data: one more client */
574 mySharedConverterData->referenceCounter++;
575 }
576
577 return mySharedConverterData;
578 }
579
580 /**
581 * Unload a non-algorithmic converter.
582 * It must be sharedData->referenceCounter != ~0
583 * and this function must be called inside umtx_lock(&cnvCacheMutex).
584 */
585 U_CAPI void
586 ucnv_unload(UConverterSharedData *sharedData) {
587 if(sharedData != NULL) {
588 if (sharedData->referenceCounter > 0) {
589 sharedData->referenceCounter--;
590 }
591
592 if((sharedData->referenceCounter <= 0)&&(sharedData->sharedDataCached == FALSE)) {
593 ucnv_deleteSharedConverterData(sharedData);
594 }
595 }
596 }
597
598 U_CFUNC void
599 ucnv_unloadSharedDataIfReady(UConverterSharedData *sharedData)
600 {
601 /*
602 Checking whether it's an algorithic converter is okay
603 in multithreaded applications because the value never changes.
604 Don't check referenceCounter for any other value.
605 */
606 if(sharedData != NULL && sharedData->referenceCounter != (uint32_t)~0) {
607 umtx_lock(&cnvCacheMutex);
608 ucnv_unload(sharedData);
609 umtx_unlock(&cnvCacheMutex);
610 }
611 }
612
613 U_CFUNC void
614 ucnv_incrementRefCount(UConverterSharedData *sharedData)
615 {
616 /*
617 Checking whether it's an algorithic converter is okay
618 in multithreaded applications because the value never changes.
619 Don't check referenceCounter for any other value.
620 */
621 if(sharedData != NULL && sharedData->referenceCounter != (uint32_t)~0) {
622 umtx_lock(&cnvCacheMutex);
623 sharedData->referenceCounter++;
624 umtx_unlock(&cnvCacheMutex);
625 }
626 }
627
628 /*
629 * *pPieces must be initialized.
630 * The name without options will be copied to pPieces->cnvName.
631 * The locale and options will be copied to pPieces only if present in inName,
632 * otherwise the existing values in pPieces remain.
633 * *pArgs will be set to the pPieces values.
634 */
635 static void
636 parseConverterOptions(const char *inName,
637 UConverterNamePieces *pPieces,
638 UConverterLoadArgs *pArgs,
639 UErrorCode *err)
640 {
641 char *cnvName = pPieces->cnvName;
642 char c;
643 int32_t len = 0;
644
645 pArgs->name=inName;
646 pArgs->locale=pPieces->locale;
647 pArgs->options=pPieces->options;
648
649 /* copy the converter name itself to cnvName */
650 while((c=*inName)!=0 && c!=UCNV_OPTION_SEP_CHAR) {
651 if (++len>=UCNV_MAX_CONVERTER_NAME_LENGTH) {
652 *err = U_ILLEGAL_ARGUMENT_ERROR; /* bad name */
653 pPieces->cnvName[0]=0;
654 return;
655 }
656 *cnvName++=c;
657 inName++;
658 }
659 *cnvName=0;
660 pArgs->name=pPieces->cnvName;
661
662 /* parse options. No more name copying should occur. */
663 while((c=*inName)!=0) {
664 if(c==UCNV_OPTION_SEP_CHAR) {
665 ++inName;
666 }
667
668 /* inName is behind an option separator */
669 if(uprv_strncmp(inName, "locale=", 7)==0) {
670 /* do not modify locale itself in case we have multiple locale options */
671 char *dest=pPieces->locale;
672
673 /* copy the locale option value */
674 inName+=7;
675 len=0;
676 while((c=*inName)!=0 && c!=UCNV_OPTION_SEP_CHAR) {
677 ++inName;
678
679 if(++len>=ULOC_FULLNAME_CAPACITY) {
680 *err=U_ILLEGAL_ARGUMENT_ERROR; /* bad name */
681 pPieces->locale[0]=0;
682 return;
683 }
684
685 *dest++=c;
686 }
687 *dest=0;
688 } else if(uprv_strncmp(inName, "version=", 8)==0) {
689 /* copy the version option value into bits 3..0 of pPieces->options */
690 inName+=8;
691 c=*inName;
692 if(c==0) {
693 pArgs->options=(pPieces->options&=~UCNV_OPTION_VERSION);
694 return;
695 } else if((uint8_t)(c-'0')<10) {
696 pArgs->options=pPieces->options=(pPieces->options&~UCNV_OPTION_VERSION)|(uint32_t)(c-'0');
697 ++inName;
698 }
699 } else if(uprv_strncmp(inName, "swaplfnl", 8)==0) {
700 inName+=8;
701 pArgs->options=(pPieces->options|=UCNV_OPTION_SWAP_LFNL);
702 /* add processing for new options here with another } else if(uprv_strncmp(inName, "option-name=", XX)==0) { */
703 } else {
704 /* ignore any other options until we define some */
705 while(((c = *inName++) != 0) && (c != UCNV_OPTION_SEP_CHAR)) {
706 }
707 if(c==0) {
708 return;
709 }
710 }
711 }
712 }
713
714 /*Logic determines if the converter is Algorithmic AND/OR cached
715 *depending on that:
716 * -we either go to get data from disk and cache it (Data=TRUE, Cached=False)
717 * -Get it from a Hashtable (Data=X, Cached=TRUE)
718 * -Call dataConverter initializer (Data=TRUE, Cached=TRUE)
719 * -Call AlgorithmicConverter initializer (Data=FALSE, Cached=TRUE)
720 */
721 U_CFUNC UConverterSharedData *
722 ucnv_loadSharedData(const char *converterName,
723 UConverterNamePieces *pPieces,
724 UConverterLoadArgs *pArgs,
725 UErrorCode * err) {
726 UConverterNamePieces stackPieces;
727 UConverterLoadArgs stackArgs;
728 UConverterSharedData *mySharedConverterData = NULL;
729 UErrorCode internalErrorCode = U_ZERO_ERROR;
730 UBool mayContainOption = TRUE;
731 UBool checkForAlgorithmic = TRUE;
732
733 if (U_FAILURE (*err)) {
734 return NULL;
735 }
736
737 if(pPieces == NULL) {
738 if(pArgs != NULL) {
739 /*
740 * Bad: We may set pArgs pointers to stackPieces fields
741 * which will be invalid after this function returns.
742 */
743 *err = U_INTERNAL_PROGRAM_ERROR;
744 return NULL;
745 }
746 pPieces = &stackPieces;
747 }
748 if(pArgs == NULL) {
749 uprv_memset(&stackArgs, 0, sizeof(stackArgs));
750 stackArgs.size = (int32_t)sizeof(stackArgs);
751 pArgs = &stackArgs;
752 }
753
754 pPieces->cnvName[0] = 0;
755 pPieces->locale[0] = 0;
756 pPieces->options = 0;
757
758 pArgs->name = converterName;
759 pArgs->locale = pPieces->locale;
760 pArgs->options = pPieces->options;
761
762 /* In case "name" is NULL we want to open the default converter. */
763 if (converterName == NULL) {
764 #if U_CHARSET_IS_UTF8
765 pArgs->name = "UTF-8";
766 return (UConverterSharedData *)converterData[UCNV_UTF8];
767 #else
768 /* Call ucnv_getDefaultName first to query the name from the OS. */
769 pArgs->name = ucnv_getDefaultName();
770 if (pArgs->name == NULL) {
771 *err = U_MISSING_RESOURCE_ERROR;
772 return NULL;
773 }
774 mySharedConverterData = (UConverterSharedData *)gDefaultAlgorithmicSharedData;
775 checkForAlgorithmic = FALSE;
776 mayContainOption = gDefaultConverterContainsOption;
777 /* the default converter name is already canonical */
778 #endif
779 }
780 else if(UCNV_FAST_IS_UTF8(converterName)) {
781 /* fastpath for UTF-8 */
782 pArgs->name = "UTF-8";
783 return (UConverterSharedData *)converterData[UCNV_UTF8];
784 }
785 else {
786 /* separate the converter name from the options */
787 parseConverterOptions(converterName, pPieces, pArgs, err);
788 if (U_FAILURE(*err)) {
789 /* Very bad name used. */
790 return NULL;
791 }
792
793 /* get the canonical converter name */
794 pArgs->name = ucnv_io_getConverterName(pArgs->name, &mayContainOption, &internalErrorCode);
795 if (U_FAILURE(internalErrorCode) || pArgs->name == NULL) {
796 /*
797 * set the input name in case the converter was added
798 * without updating the alias table, or when there is no alias table
799 */
800 pArgs->name = pPieces->cnvName;
801 } else if (internalErrorCode == U_AMBIGUOUS_ALIAS_WARNING) {
802 *err = U_AMBIGUOUS_ALIAS_WARNING;
803 }
804 }
805
806 /* separate the converter name from the options */
807 if(mayContainOption && pArgs->name != pPieces->cnvName) {
808 parseConverterOptions(pArgs->name, pPieces, pArgs, err);
809 }
810
811 /* get the shared data for an algorithmic converter, if it is one */
812 if (checkForAlgorithmic) {
813 mySharedConverterData = (UConverterSharedData *)getAlgorithmicTypeFromName(pArgs->name);
814 }
815 if (mySharedConverterData == NULL)
816 {
817 /* it is a data-based converter, get its shared data. */
818 /* Hold the cnvCacheMutex through the whole process of checking the */
819 /* converter data cache, and adding new entries to the cache */
820 /* to prevent other threads from modifying the cache during the */
821 /* process. */
822 pArgs->nestedLoads=1;
823 pArgs->pkg=NULL;
824
825 umtx_lock(&cnvCacheMutex);
826 mySharedConverterData = ucnv_load(pArgs, err);
827 umtx_unlock(&cnvCacheMutex);
828 if (U_FAILURE (*err) || (mySharedConverterData == NULL))
829 {
830 return NULL;
831 }
832 }
833
834 return mySharedConverterData;
835 }
836
837 U_CAPI UConverter *
838 ucnv_createConverter(UConverter *myUConverter, const char *converterName, UErrorCode * err)
839 {
840 UConverterNamePieces stackPieces;
841 UConverterLoadArgs stackArgs=UCNV_LOAD_ARGS_INITIALIZER;
842 UConverterSharedData *mySharedConverterData;
843
844 UTRACE_ENTRY_OC(UTRACE_UCNV_OPEN);
845
846 if(U_SUCCESS(*err)) {
847 UTRACE_DATA1(UTRACE_OPEN_CLOSE, "open converter %s", converterName);
848
849 mySharedConverterData = ucnv_loadSharedData(converterName, &stackPieces, &stackArgs, err);
850
851 myUConverter = ucnv_createConverterFromSharedData(
852 myUConverter, mySharedConverterData,
853 &stackArgs,
854 err);
855
856 if(U_SUCCESS(*err)) {
857 UTRACE_EXIT_PTR_STATUS(myUConverter, *err);
858 return myUConverter;
859 }
860 }
861
862 /* exit with error */
863 UTRACE_EXIT_STATUS(*err);
864 return NULL;
865 }
866
867 U_CFUNC UBool
868 ucnv_canCreateConverter(const char *converterName, UErrorCode *err) {
869 UConverter myUConverter;
870 UConverterNamePieces stackPieces;
871 UConverterLoadArgs stackArgs=UCNV_LOAD_ARGS_INITIALIZER;
872 UConverterSharedData *mySharedConverterData;
873
874 UTRACE_ENTRY_OC(UTRACE_UCNV_OPEN);
875
876 if(U_SUCCESS(*err)) {
877 UTRACE_DATA1(UTRACE_OPEN_CLOSE, "test if can open converter %s", converterName);
878
879 stackArgs.onlyTestIsLoadable=TRUE;
880 mySharedConverterData = ucnv_loadSharedData(converterName, &stackPieces, &stackArgs, err);
881 ucnv_createConverterFromSharedData(
882 &myUConverter, mySharedConverterData,
883 &stackArgs,
884 err);
885 ucnv_unloadSharedDataIfReady(mySharedConverterData);
886 }
887
888 UTRACE_EXIT_STATUS(*err);
889 return U_SUCCESS(*err);
890 }
891
892 UConverter *
893 ucnv_createAlgorithmicConverter(UConverter *myUConverter,
894 UConverterType type,
895 const char *locale, uint32_t options,
896 UErrorCode *err) {
897 UConverter *cnv;
898 const UConverterSharedData *sharedData;
899 UConverterLoadArgs stackArgs=UCNV_LOAD_ARGS_INITIALIZER;
900
901 UTRACE_ENTRY_OC(UTRACE_UCNV_OPEN_ALGORITHMIC);
902 UTRACE_DATA1(UTRACE_OPEN_CLOSE, "open algorithmic converter type %d", (int32_t)type);
903
904 if(type<0 || UCNV_NUMBER_OF_SUPPORTED_CONVERTER_TYPES<=type) {
905 *err = U_ILLEGAL_ARGUMENT_ERROR;
906 UTRACE_EXIT_STATUS(U_ILLEGAL_ARGUMENT_ERROR);
907 return NULL;
908 }
909
910 sharedData = converterData[type];
911 /*
912 Checking whether it's an algorithic converter is okay
913 in multithreaded applications because the value never changes.
914 Don't check referenceCounter for any other value.
915 */
916 if(sharedData == NULL || sharedData->referenceCounter != (uint32_t)~0) {
917 /* not a valid type, or not an algorithmic converter */
918 *err = U_ILLEGAL_ARGUMENT_ERROR;
919 UTRACE_EXIT_STATUS(U_ILLEGAL_ARGUMENT_ERROR);
920 return NULL;
921 }
922
923 stackArgs.name = "";
924 stackArgs.options = options;
925 stackArgs.locale=locale;
926 cnv = ucnv_createConverterFromSharedData(
927 myUConverter, (UConverterSharedData *)sharedData,
928 &stackArgs, err);
929
930 UTRACE_EXIT_PTR_STATUS(cnv, *err);
931 return cnv;
932 }
933
934 U_CFUNC UConverter*
935 ucnv_createConverterFromPackage(const char *packageName, const char *converterName, UErrorCode * err)
936 {
937 UConverter *myUConverter;
938 UConverterSharedData *mySharedConverterData;
939 UConverterNamePieces stackPieces;
940 UConverterLoadArgs stackArgs=UCNV_LOAD_ARGS_INITIALIZER;
941
942 UTRACE_ENTRY_OC(UTRACE_UCNV_OPEN_PACKAGE);
943
944 if(U_FAILURE(*err)) {
945 UTRACE_EXIT_STATUS(*err);
946 return NULL;
947 }
948
949 UTRACE_DATA2(UTRACE_OPEN_CLOSE, "open converter %s from package %s", converterName, packageName);
950
951 /* first, get the options out of the converterName string */
952 stackPieces.cnvName[0] = 0;
953 stackPieces.locale[0] = 0;
954 stackPieces.options = 0;
955 parseConverterOptions(converterName, &stackPieces, &stackArgs, err);
956 if (U_FAILURE(*err)) {
957 /* Very bad name used. */
958 UTRACE_EXIT_STATUS(*err);
959 return NULL;
960 }
961 stackArgs.nestedLoads=1;
962 stackArgs.pkg=packageName;
963
964 /* open the data, unflatten the shared structure */
965 mySharedConverterData = createConverterFromFile(&stackArgs, err);
966
967 if (U_FAILURE(*err)) {
968 UTRACE_EXIT_STATUS(*err);
969 return NULL;
970 }
971
972 /* create the actual converter */
973 myUConverter = ucnv_createConverterFromSharedData(NULL, mySharedConverterData, &stackArgs, err);
974
975 if (U_FAILURE(*err)) {
976 ucnv_close(myUConverter);
977 UTRACE_EXIT_STATUS(*err);
978 return NULL;
979 }
980
981 UTRACE_EXIT_PTR_STATUS(myUConverter, *err);
982 return myUConverter;
983 }
984
985
986 U_CFUNC UConverter*
987 ucnv_createConverterFromSharedData(UConverter *myUConverter,
988 UConverterSharedData *mySharedConverterData,
989 UConverterLoadArgs *pArgs,
990 UErrorCode *err)
991 {
992 UBool isCopyLocal;
993
994 if(U_FAILURE(*err)) {
995 ucnv_unloadSharedDataIfReady(mySharedConverterData);
996 return myUConverter;
997 }
998 if(myUConverter == NULL)
999 {
1000 myUConverter = (UConverter *) uprv_malloc (sizeof (UConverter));
1001 if(myUConverter == NULL)
1002 {
1003 *err = U_MEMORY_ALLOCATION_ERROR;
1004 ucnv_unloadSharedDataIfReady(mySharedConverterData);
1005 return NULL;
1006 }
1007 isCopyLocal = FALSE;
1008 } else {
1009 isCopyLocal = TRUE;
1010 }
1011
1012 /* initialize the converter */
1013 uprv_memset(myUConverter, 0, sizeof(UConverter));
1014 myUConverter->isCopyLocal = isCopyLocal;
1015 /*myUConverter->isExtraLocal = FALSE;*/ /* Set by the memset call */
1016 myUConverter->sharedData = mySharedConverterData;
1017 myUConverter->options = pArgs->options;
1018 if(!pArgs->onlyTestIsLoadable) {
1019 myUConverter->preFromUFirstCP = U_SENTINEL;
1020 myUConverter->fromCharErrorBehaviour = UCNV_TO_U_DEFAULT_CALLBACK;
1021 myUConverter->fromUCharErrorBehaviour = UCNV_FROM_U_DEFAULT_CALLBACK;
1022 myUConverter->toUnicodeStatus = mySharedConverterData->toUnicodeStatus;
1023 myUConverter->maxBytesPerUChar = mySharedConverterData->staticData->maxBytesPerChar;
1024 myUConverter->subChar1 = mySharedConverterData->staticData->subChar1;
1025 myUConverter->subCharLen = mySharedConverterData->staticData->subCharLen;
1026 myUConverter->subChars = (uint8_t *)myUConverter->subUChars;
1027 uprv_memcpy(myUConverter->subChars, mySharedConverterData->staticData->subChar, myUConverter->subCharLen);
1028 myUConverter->toUCallbackReason = UCNV_ILLEGAL; /* default reason to invoke (*fromCharErrorBehaviour) */
1029 }
1030
1031 if(mySharedConverterData->impl->open != NULL) {
1032 mySharedConverterData->impl->open(myUConverter, pArgs, err);
1033 if(U_FAILURE(*err) && !pArgs->onlyTestIsLoadable) {
1034 /* don't ucnv_close() if onlyTestIsLoadable because not fully initialized */
1035 ucnv_close(myUConverter);
1036 return NULL;
1037 }
1038 }
1039
1040 return myUConverter;
1041 }
1042
1043 /*Frees all shared immutable objects that aren't referred to (reference count = 0)
1044 */
1045 U_CAPI int32_t U_EXPORT2
1046 ucnv_flushCache ()
1047 {
1048 UConverterSharedData *mySharedData = NULL;
1049 int32_t pos;
1050 int32_t tableDeletedNum = 0;
1051 const UHashElement *e;
1052 /*UErrorCode status = U_ILLEGAL_ARGUMENT_ERROR;*/
1053 int32_t i, remaining;
1054
1055 UTRACE_ENTRY_OC(UTRACE_UCNV_FLUSH_CACHE);
1056
1057 /* Close the default converter without creating a new one so that everything will be flushed. */
1058 u_flushDefaultConverter();
1059
1060 /*if shared data hasn't even been lazy evaluated yet
1061 * return 0
1062 */
1063 if (SHARED_DATA_HASHTABLE == NULL) {
1064 UTRACE_EXIT_VALUE((int32_t)0);
1065 return 0;
1066 }
1067
1068 /*creates an enumeration to iterate through every element in the
1069 * table
1070 *
1071 * Synchronization: holding cnvCacheMutex will prevent any other thread from
1072 * accessing or modifying the hash table during the iteration.
1073 * The reference count of an entry may be decremented by
1074 * ucnv_close while the iteration is in process, but this is
1075 * benign. It can't be incremented (in ucnv_createConverter())
1076 * because the sequence of looking up in the cache + incrementing
1077 * is protected by cnvCacheMutex.
1078 */
1079 umtx_lock(&cnvCacheMutex);
1080 /*
1081 * double loop: A delta/extension-only converter has a pointer to its base table's
1082 * shared data; the first iteration of the outer loop may see the delta converter
1083 * before the base converter, and unloading the delta converter may get the base
1084 * converter's reference counter down to 0.
1085 */
1086 i = 0;
1087 do {
1088 remaining = 0;
1089 pos = -1;
1090 while ((e = uhash_nextElement (SHARED_DATA_HASHTABLE, &pos)) != NULL)
1091 {
1092 mySharedData = (UConverterSharedData *) e->value.pointer;
1093 /*deletes only if reference counter == 0 */
1094 if (mySharedData->referenceCounter == 0)
1095 {
1096 tableDeletedNum++;
1097
1098 UCNV_DEBUG_LOG("del",mySharedData->staticData->name,mySharedData);
1099
1100 uhash_removeElement(SHARED_DATA_HASHTABLE, e);
1101 mySharedData->sharedDataCached = FALSE;
1102 ucnv_deleteSharedConverterData (mySharedData);
1103 } else {
1104 ++remaining;
1105 }
1106 }
1107 } while(++i == 1 && remaining > 0);
1108 umtx_unlock(&cnvCacheMutex);
1109
1110 UTRACE_DATA1(UTRACE_INFO, "ucnv_flushCache() exits with %d converters remaining", remaining);
1111
1112 UTRACE_EXIT_VALUE(tableDeletedNum);
1113 return tableDeletedNum;
1114 }
1115
1116 /* available converters list --------------------------------------------------- */
1117
1118 static void U_CALLCONV initAvailableConvertersList(UErrorCode &errCode) {
1119 U_ASSERT(gAvailableConverterCount == 0);
1120 U_ASSERT(gAvailableConverters == NULL);
1121
1122 ucln_common_registerCleanup(UCLN_COMMON_UCNV, ucnv_cleanup);
1123 UEnumeration *allConvEnum = ucnv_openAllNames(&errCode);
1124 int32_t allConverterCount = uenum_count(allConvEnum, &errCode);
1125 if (U_FAILURE(errCode)) {
1126 return;
1127 }
1128
1129 /* We can't have more than "*converterTable" converters to open */
1130 gAvailableConverters = (const char **) uprv_malloc(allConverterCount * sizeof(char*));
1131 if (!gAvailableConverters) {
1132 errCode = U_MEMORY_ALLOCATION_ERROR;
1133 return;
1134 }
1135
1136 /* Open the default converter to make sure that it has first dibs in the hash table. */
1137 UErrorCode localStatus = U_ZERO_ERROR;
1138 UConverter tempConverter;
1139 ucnv_close(ucnv_createConverter(&tempConverter, NULL, &localStatus));
1140
1141 gAvailableConverterCount = 0;
1142
1143 for (int32_t idx = 0; idx < allConverterCount; idx++) {
1144 localStatus = U_ZERO_ERROR;
1145 const char *converterName = uenum_next(allConvEnum, NULL, &localStatus);
1146 if (ucnv_canCreateConverter(converterName, &localStatus)) {
1147 gAvailableConverters[gAvailableConverterCount++] = converterName;
1148 }
1149 }
1150
1151 uenum_close(allConvEnum);
1152 }
1153
1154
1155 static UBool haveAvailableConverterList(UErrorCode *pErrorCode) {
1156 umtx_initOnce(gAvailableConvertersInitOnce, &initAvailableConvertersList, *pErrorCode);
1157 return U_SUCCESS(*pErrorCode);
1158 }
1159
1160 U_CFUNC uint16_t
1161 ucnv_bld_countAvailableConverters(UErrorCode *pErrorCode) {
1162 if (haveAvailableConverterList(pErrorCode)) {
1163 return gAvailableConverterCount;
1164 }
1165 return 0;
1166 }
1167
1168 U_CFUNC const char *
1169 ucnv_bld_getAvailableConverter(uint16_t n, UErrorCode *pErrorCode) {
1170 if (haveAvailableConverterList(pErrorCode)) {
1171 if (n < gAvailableConverterCount) {
1172 return gAvailableConverters[n];
1173 }
1174 *pErrorCode = U_INDEX_OUTOFBOUNDS_ERROR;
1175 }
1176 return NULL;
1177 }
1178
1179 /* default converter name --------------------------------------------------- */
1180
1181 #if !U_CHARSET_IS_UTF8
1182 /*
1183 Copy the canonical converter name.
1184 ucnv_getDefaultName must be thread safe, which can call this function.
1185
1186 ucnv_setDefaultName calls this function and it doesn't have to be
1187 thread safe because there is no reliable/safe way to reset the
1188 converter in use in all threads. If you did reset the converter, you
1189 would not be sure that retrieving a default converter for one string
1190 would be the same type of default converter for a successive string.
1191 Since the name is a returned via ucnv_getDefaultName without copying,
1192 you shouldn't be modifying or deleting the string from a separate thread.
1193 */
1194 static inline void
1195 internalSetName(const char *name, UErrorCode *status) {
1196 UConverterNamePieces stackPieces;
1197 UConverterLoadArgs stackArgs=UCNV_LOAD_ARGS_INITIALIZER;
1198 int32_t length=(int32_t)(uprv_strlen(name));
1199 UBool containsOption = (UBool)(uprv_strchr(name, UCNV_OPTION_SEP_CHAR) != NULL);
1200 const UConverterSharedData *algorithmicSharedData;
1201
1202 stackArgs.name = name;
1203 if(containsOption) {
1204 stackPieces.cnvName[0] = 0;
1205 stackPieces.locale[0] = 0;
1206 stackPieces.options = 0;
1207 parseConverterOptions(name, &stackPieces, &stackArgs, status);
1208 if(U_FAILURE(*status)) {
1209 return;
1210 }
1211 }
1212 algorithmicSharedData = getAlgorithmicTypeFromName(stackArgs.name);
1213
1214 umtx_lock(&cnvCacheMutex);
1215
1216 gDefaultAlgorithmicSharedData = algorithmicSharedData;
1217 gDefaultConverterContainsOption = containsOption;
1218 uprv_memcpy(gDefaultConverterNameBuffer, name, length);
1219 gDefaultConverterNameBuffer[length]=0;
1220
1221 /* gDefaultConverterName MUST be the last global var set by this function. */
1222 /* It is the variable checked in ucnv_getDefaultName() to see if initialization is required. */
1223 // But there is nothing here preventing that from being reordered, either by the compiler
1224 // or hardware. I'm adding the mutex to ucnv_getDefaultName for now. UMTX_CHECK is not enough.
1225 // -- Andy
1226 gDefaultConverterName = gDefaultConverterNameBuffer;
1227
1228 ucln_common_registerCleanup(UCLN_COMMON_UCNV, ucnv_cleanup);
1229
1230 umtx_unlock(&cnvCacheMutex);
1231 }
1232 #endif
1233
1234 /*
1235 * In order to be really thread-safe, the get function would have to take
1236 * a buffer parameter and copy the current string inside a mutex block.
1237 * This implementation only tries to be really thread-safe while
1238 * setting the name.
1239 * It assumes that setting a pointer is atomic.
1240 */
1241
1242 U_CAPI const char* U_EXPORT2
1243 ucnv_getDefaultName() {
1244 #if U_CHARSET_IS_UTF8
1245 return "UTF-8";
1246 #else
1247 /* local variable to be thread-safe */
1248 const char *name;
1249
1250 /*
1251 Concurrent calls to ucnv_getDefaultName must be thread safe,
1252 but ucnv_setDefaultName is not thread safe.
1253 */
1254 {
1255 icu::Mutex lock(&cnvCacheMutex);
1256 name = gDefaultConverterName;
1257 }
1258 if(name==NULL) {
1259 UErrorCode errorCode = U_ZERO_ERROR;
1260 UConverter *cnv = NULL;
1261
1262 name = uprv_getDefaultCodepage();
1263
1264 /* if the name is there, test it out and get the canonical name with options */
1265 if(name != NULL) {
1266 cnv = ucnv_open(name, &errorCode);
1267 if(U_SUCCESS(errorCode) && cnv != NULL) {
1268 name = ucnv_getName(cnv, &errorCode);
1269 }
1270 }
1271
1272 if(name == NULL || name[0] == 0
1273 || U_FAILURE(errorCode) || cnv == NULL
1274 || uprv_strlen(name)>=sizeof(gDefaultConverterNameBuffer))
1275 {
1276 /* Panic time, let's use a fallback. */
1277 #if (U_CHARSET_FAMILY == U_ASCII_FAMILY)
1278 name = "US-ASCII";
1279 /* there is no 'algorithmic' converter for EBCDIC */
1280 #elif U_PLATFORM == U_PF_OS390
1281 name = "ibm-1047_P100-1995" UCNV_SWAP_LFNL_OPTION_STRING;
1282 #else
1283 name = "ibm-37_P100-1995";
1284 #endif
1285 }
1286
1287 internalSetName(name, &errorCode);
1288
1289 /* The close may make the current name go away. */
1290 ucnv_close(cnv);
1291 }
1292
1293 return name;
1294 #endif
1295 }
1296
1297 #if U_CHARSET_IS_UTF8
1298 U_CAPI void U_EXPORT2 ucnv_setDefaultName(const char *) {}
1299 #else
1300 /*
1301 This function is not thread safe, and it can't be thread safe.
1302 See internalSetName or the API reference for details.
1303 */
1304 U_CAPI void U_EXPORT2
1305 ucnv_setDefaultName(const char *converterName) {
1306 if(converterName==NULL) {
1307 /* reset to the default codepage */
1308 gDefaultConverterName=NULL;
1309 } else {
1310 UErrorCode errorCode = U_ZERO_ERROR;
1311 UConverter *cnv = NULL;
1312 const char *name = NULL;
1313
1314 /* if the name is there, test it out and get the canonical name with options */
1315 cnv = ucnv_open(converterName, &errorCode);
1316 if(U_SUCCESS(errorCode) && cnv != NULL) {
1317 name = ucnv_getName(cnv, &errorCode);
1318 }
1319
1320 if(U_SUCCESS(errorCode) && name!=NULL) {
1321 internalSetName(name, &errorCode);
1322 }
1323 /* else this converter is bad to use. Don't change it to a bad value. */
1324
1325 /* The close may make the current name go away. */
1326 ucnv_close(cnv);
1327
1328 /* reset the converter cache */
1329 u_flushDefaultConverter();
1330 }
1331 }
1332 #endif
1333
1334 /* data swapping ------------------------------------------------------------ */
1335
1336 /* most of this might belong more properly into ucnvmbcs.c, but that is so large */
1337
1338 #if !UCONFIG_NO_LEGACY_CONVERSION
1339
1340 U_CAPI int32_t U_EXPORT2
1341 ucnv_swap(const UDataSwapper *ds,
1342 const void *inData, int32_t length, void *outData,
1343 UErrorCode *pErrorCode) {
1344 const UDataInfo *pInfo;
1345 int32_t headerSize;
1346
1347 const uint8_t *inBytes;
1348 uint8_t *outBytes;
1349
1350 uint32_t offset, count, staticDataSize;
1351 int32_t size;
1352
1353 const UConverterStaticData *inStaticData;
1354 UConverterStaticData *outStaticData;
1355
1356 const _MBCSHeader *inMBCSHeader;
1357 _MBCSHeader *outMBCSHeader;
1358 _MBCSHeader mbcsHeader;
1359 uint32_t mbcsHeaderLength;
1360 UBool noFromU=FALSE;
1361
1362 uint8_t outputType;
1363
1364 int32_t maxFastUChar, mbcsIndexLength;
1365
1366 const int32_t *inExtIndexes;
1367 int32_t extOffset;
1368
1369 /* udata_swapDataHeader checks the arguments */
1370 headerSize=udata_swapDataHeader(ds, inData, length, outData, pErrorCode);
1371 if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
1372 return 0;
1373 }
1374
1375 /* check data format and format version */
1376 pInfo=(const UDataInfo *)((const char *)inData+4);
1377 if(!(
1378 pInfo->dataFormat[0]==0x63 && /* dataFormat="cnvt" */
1379 pInfo->dataFormat[1]==0x6e &&
1380 pInfo->dataFormat[2]==0x76 &&
1381 pInfo->dataFormat[3]==0x74 &&
1382 pInfo->formatVersion[0]==6 &&
1383 pInfo->formatVersion[1]>=2
1384 )) {
1385 udata_printError(ds, "ucnv_swap(): data format %02x.%02x.%02x.%02x (format version %02x.%02x) is not recognized as an ICU .cnv conversion table\n",
1386 pInfo->dataFormat[0], pInfo->dataFormat[1],
1387 pInfo->dataFormat[2], pInfo->dataFormat[3],
1388 pInfo->formatVersion[0], pInfo->formatVersion[1]);
1389 *pErrorCode=U_UNSUPPORTED_ERROR;
1390 return 0;
1391 }
1392
1393 inBytes=(const uint8_t *)inData+headerSize;
1394 outBytes=(uint8_t *)outData+headerSize;
1395
1396 /* read the initial UConverterStaticData structure after the UDataInfo header */
1397 inStaticData=(const UConverterStaticData *)inBytes;
1398 outStaticData=(UConverterStaticData *)outBytes;
1399
1400 if(length<0) {
1401 staticDataSize=ds->readUInt32(inStaticData->structSize);
1402 } else {
1403 length-=headerSize;
1404 if( length<(int32_t)sizeof(UConverterStaticData) ||
1405 (uint32_t)length<(staticDataSize=ds->readUInt32(inStaticData->structSize))
1406 ) {
1407 udata_printError(ds, "ucnv_swap(): too few bytes (%d after header) for an ICU .cnv conversion table\n",
1408 length);
1409 *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
1410 return 0;
1411 }
1412 }
1413
1414 if(length>=0) {
1415 /* swap the static data */
1416 if(inStaticData!=outStaticData) {
1417 uprv_memcpy(outStaticData, inStaticData, staticDataSize);
1418 }
1419
1420 ds->swapArray32(ds, &inStaticData->structSize, 4,
1421 &outStaticData->structSize, pErrorCode);
1422 ds->swapArray32(ds, &inStaticData->codepage, 4,
1423 &outStaticData->codepage, pErrorCode);
1424
1425 ds->swapInvChars(ds, inStaticData->name, (int32_t)uprv_strlen(inStaticData->name),
1426 outStaticData->name, pErrorCode);
1427 if(U_FAILURE(*pErrorCode)) {
1428 udata_printError(ds, "ucnv_swap(): error swapping converter name\n");
1429 return 0;
1430 }
1431 }
1432
1433 inBytes+=staticDataSize;
1434 outBytes+=staticDataSize;
1435 if(length>=0) {
1436 length-=(int32_t)staticDataSize;
1437 }
1438
1439 /* check for supported conversionType values */
1440 if(inStaticData->conversionType==UCNV_MBCS) {
1441 /* swap MBCS data */
1442 inMBCSHeader=(const _MBCSHeader *)inBytes;
1443 outMBCSHeader=(_MBCSHeader *)outBytes;
1444
1445 if(0<=length && length<(int32_t)sizeof(_MBCSHeader)) {
1446 udata_printError(ds, "ucnv_swap(): too few bytes (%d after headers) for an ICU MBCS .cnv conversion table\n",
1447 length);
1448 *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
1449 return 0;
1450 }
1451 if(inMBCSHeader->version[0]==4 && inMBCSHeader->version[1]>=1) {
1452 mbcsHeaderLength=MBCS_HEADER_V4_LENGTH;
1453 } else if(inMBCSHeader->version[0]==5 && inMBCSHeader->version[1]>=3 &&
1454 ((mbcsHeader.options=ds->readUInt32(inMBCSHeader->options))&
1455 MBCS_OPT_UNKNOWN_INCOMPATIBLE_MASK)==0
1456 ) {
1457 mbcsHeaderLength=mbcsHeader.options&MBCS_OPT_LENGTH_MASK;
1458 noFromU=(UBool)((mbcsHeader.options&MBCS_OPT_NO_FROM_U)!=0);
1459 } else {
1460 udata_printError(ds, "ucnv_swap(): unsupported _MBCSHeader.version %d.%d\n",
1461 inMBCSHeader->version[0], inMBCSHeader->version[1]);
1462 *pErrorCode=U_UNSUPPORTED_ERROR;
1463 return 0;
1464 }
1465
1466 uprv_memcpy(mbcsHeader.version, inMBCSHeader->version, 4);
1467 mbcsHeader.countStates= ds->readUInt32(inMBCSHeader->countStates);
1468 mbcsHeader.countToUFallbacks= ds->readUInt32(inMBCSHeader->countToUFallbacks);
1469 mbcsHeader.offsetToUCodeUnits= ds->readUInt32(inMBCSHeader->offsetToUCodeUnits);
1470 mbcsHeader.offsetFromUTable= ds->readUInt32(inMBCSHeader->offsetFromUTable);
1471 mbcsHeader.offsetFromUBytes= ds->readUInt32(inMBCSHeader->offsetFromUBytes);
1472 mbcsHeader.flags= ds->readUInt32(inMBCSHeader->flags);
1473 mbcsHeader.fromUBytesLength= ds->readUInt32(inMBCSHeader->fromUBytesLength);
1474 /* mbcsHeader.options have been read above */
1475
1476 extOffset=(int32_t)(mbcsHeader.flags>>8);
1477 outputType=(uint8_t)mbcsHeader.flags;
1478 if(noFromU && outputType==MBCS_OUTPUT_1) {
1479 udata_printError(ds, "ucnv_swap(): unsupported combination of makeconv --small with SBCS\n");
1480 *pErrorCode=U_UNSUPPORTED_ERROR;
1481 return 0;
1482 }
1483
1484 /* make sure that the output type is known */
1485 switch(outputType) {
1486 case MBCS_OUTPUT_1:
1487 case MBCS_OUTPUT_2:
1488 case MBCS_OUTPUT_3:
1489 case MBCS_OUTPUT_4:
1490 case MBCS_OUTPUT_3_EUC:
1491 case MBCS_OUTPUT_4_EUC:
1492 case MBCS_OUTPUT_2_SISO:
1493 case MBCS_OUTPUT_EXT_ONLY:
1494 /* OK */
1495 break;
1496 default:
1497 udata_printError(ds, "ucnv_swap(): unsupported MBCS output type 0x%x\n",
1498 outputType);
1499 *pErrorCode=U_UNSUPPORTED_ERROR;
1500 return 0;
1501 }
1502
1503 /* calculate the length of the MBCS data */
1504
1505 /*
1506 * utf8Friendly MBCS files (mbcsHeader.version 4.3)
1507 * contain an additional mbcsIndex table:
1508 * uint16_t[(maxFastUChar+1)>>6];
1509 * where maxFastUChar=((mbcsHeader.version[2]<<8)|0xff).
1510 */
1511 maxFastUChar=0;
1512 mbcsIndexLength=0;
1513 if( outputType!=MBCS_OUTPUT_EXT_ONLY && outputType!=MBCS_OUTPUT_1 &&
1514 mbcsHeader.version[1]>=3 && (maxFastUChar=mbcsHeader.version[2])!=0
1515 ) {
1516 maxFastUChar=(maxFastUChar<<8)|0xff;
1517 mbcsIndexLength=((maxFastUChar+1)>>6)*2; /* number of bytes */
1518 }
1519
1520 if(extOffset==0) {
1521 size=(int32_t)(mbcsHeader.offsetFromUBytes+mbcsIndexLength);
1522 if(!noFromU) {
1523 size+=(int32_t)mbcsHeader.fromUBytesLength;
1524 }
1525
1526 /* avoid compiler warnings - not otherwise necessary, and the value does not matter */
1527 inExtIndexes=NULL;
1528 } else {
1529 /* there is extension data after the base data, see ucnv_ext.h */
1530 if(length>=0 && length<(extOffset+UCNV_EXT_INDEXES_MIN_LENGTH*4)) {
1531 udata_printError(ds, "ucnv_swap(): too few bytes (%d after headers) for an ICU MBCS .cnv conversion table with extension data\n",
1532 length);
1533 *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
1534 return 0;
1535 }
1536
1537 inExtIndexes=(const int32_t *)(inBytes+extOffset);
1538 size=extOffset+udata_readInt32(ds, inExtIndexes[UCNV_EXT_SIZE]);
1539 }
1540
1541 if(length>=0) {
1542 if(length<size) {
1543 udata_printError(ds, "ucnv_swap(): too few bytes (%d after headers) for an ICU MBCS .cnv conversion table\n",
1544 length);
1545 *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
1546 return 0;
1547 }
1548
1549 /* copy the data for inaccessible bytes */
1550 if(inBytes!=outBytes) {
1551 uprv_memcpy(outBytes, inBytes, size);
1552 }
1553
1554 /* swap the MBCSHeader, except for the version field */
1555 count=mbcsHeaderLength*4;
1556 ds->swapArray32(ds, &inMBCSHeader->countStates, count-4,
1557 &outMBCSHeader->countStates, pErrorCode);
1558
1559 if(outputType==MBCS_OUTPUT_EXT_ONLY) {
1560 /*
1561 * extension-only file,
1562 * contains a base name instead of normal base table data
1563 */
1564
1565 /* swap the base name, between the header and the extension data */
1566 const char *inBaseName=(const char *)inBytes+count;
1567 char *outBaseName=(char *)outBytes+count;
1568 ds->swapInvChars(ds, inBaseName, (int32_t)uprv_strlen(inBaseName),
1569 outBaseName, pErrorCode);
1570 } else {
1571 /* normal file with base table data */
1572
1573 /* swap the state table, 1kB per state */
1574 offset=count;
1575 count=mbcsHeader.countStates*1024;
1576 ds->swapArray32(ds, inBytes+offset, (int32_t)count,
1577 outBytes+offset, pErrorCode);
1578
1579 /* swap the toUFallbacks[] */
1580 offset+=count;
1581 count=mbcsHeader.countToUFallbacks*8;
1582 ds->swapArray32(ds, inBytes+offset, (int32_t)count,
1583 outBytes+offset, pErrorCode);
1584
1585 /* swap the unicodeCodeUnits[] */
1586 offset=mbcsHeader.offsetToUCodeUnits;
1587 count=mbcsHeader.offsetFromUTable-offset;
1588 ds->swapArray16(ds, inBytes+offset, (int32_t)count,
1589 outBytes+offset, pErrorCode);
1590
1591 /* offset to the stage 1 table, independent of the outputType */
1592 offset=mbcsHeader.offsetFromUTable;
1593
1594 if(outputType==MBCS_OUTPUT_1) {
1595 /* SBCS: swap the fromU tables, all 16 bits wide */
1596 count=(mbcsHeader.offsetFromUBytes-offset)+mbcsHeader.fromUBytesLength;
1597 ds->swapArray16(ds, inBytes+offset, (int32_t)count,
1598 outBytes+offset, pErrorCode);
1599 } else {
1600 /* otherwise: swap the stage tables separately */
1601
1602 /* stage 1 table: uint16_t[0x440 or 0x40] */
1603 if(inStaticData->unicodeMask&UCNV_HAS_SUPPLEMENTARY) {
1604 count=0x440*2; /* for all of Unicode */
1605 } else {
1606 count=0x40*2; /* only BMP */
1607 }
1608 ds->swapArray16(ds, inBytes+offset, (int32_t)count,
1609 outBytes+offset, pErrorCode);
1610
1611 /* stage 2 table: uint32_t[] */
1612 offset+=count;
1613 count=mbcsHeader.offsetFromUBytes-offset;
1614 ds->swapArray32(ds, inBytes+offset, (int32_t)count,
1615 outBytes+offset, pErrorCode);
1616
1617 /* stage 3/result bytes: sometimes uint16_t[] or uint32_t[] */
1618 offset=mbcsHeader.offsetFromUBytes;
1619 count= noFromU ? 0 : mbcsHeader.fromUBytesLength;
1620 switch(outputType) {
1621 case MBCS_OUTPUT_2:
1622 case MBCS_OUTPUT_3_EUC:
1623 case MBCS_OUTPUT_2_SISO:
1624 ds->swapArray16(ds, inBytes+offset, (int32_t)count,
1625 outBytes+offset, pErrorCode);
1626 break;
1627 case MBCS_OUTPUT_4:
1628 ds->swapArray32(ds, inBytes+offset, (int32_t)count,
1629 outBytes+offset, pErrorCode);
1630 break;
1631 default:
1632 /* just uint8_t[], nothing to swap */
1633 break;
1634 }
1635
1636 if(mbcsIndexLength!=0) {
1637 offset+=count;
1638 count=mbcsIndexLength;
1639 ds->swapArray16(ds, inBytes+offset, (int32_t)count,
1640 outBytes+offset, pErrorCode);
1641 }
1642 }
1643 }
1644
1645 if(extOffset!=0) {
1646 /* swap the extension data */
1647 inBytes+=extOffset;
1648 outBytes+=extOffset;
1649
1650 /* swap toUTable[] */
1651 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_TO_U_INDEX]);
1652 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_TO_U_LENGTH]);
1653 ds->swapArray32(ds, inBytes+offset, length*4, outBytes+offset, pErrorCode);
1654
1655 /* swap toUUChars[] */
1656 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_TO_U_UCHARS_INDEX]);
1657 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_TO_U_UCHARS_LENGTH]);
1658 ds->swapArray16(ds, inBytes+offset, length*2, outBytes+offset, pErrorCode);
1659
1660 /* swap fromUTableUChars[] */
1661 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_UCHARS_INDEX]);
1662 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_LENGTH]);
1663 ds->swapArray16(ds, inBytes+offset, length*2, outBytes+offset, pErrorCode);
1664
1665 /* swap fromUTableValues[] */
1666 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_VALUES_INDEX]);
1667 /* same length as for fromUTableUChars[] */
1668 ds->swapArray32(ds, inBytes+offset, length*4, outBytes+offset, pErrorCode);
1669
1670 /* no need to swap fromUBytes[] */
1671
1672 /* swap fromUStage12[] */
1673 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_STAGE_12_INDEX]);
1674 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_STAGE_12_LENGTH]);
1675 ds->swapArray16(ds, inBytes+offset, length*2, outBytes+offset, pErrorCode);
1676
1677 /* swap fromUStage3[] */
1678 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_STAGE_3_INDEX]);
1679 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_STAGE_3_LENGTH]);
1680 ds->swapArray16(ds, inBytes+offset, length*2, outBytes+offset, pErrorCode);
1681
1682 /* swap fromUStage3b[] */
1683 offset=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_STAGE_3B_INDEX]);
1684 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_FROM_U_STAGE_3B_LENGTH]);
1685 ds->swapArray32(ds, inBytes+offset, length*4, outBytes+offset, pErrorCode);
1686
1687 /* swap indexes[] */
1688 length=udata_readInt32(ds, inExtIndexes[UCNV_EXT_INDEXES_LENGTH]);
1689 ds->swapArray32(ds, inBytes, length*4, outBytes, pErrorCode);
1690 }
1691 }
1692 } else {
1693 udata_printError(ds, "ucnv_swap(): unknown conversionType=%d!=UCNV_MBCS\n",
1694 inStaticData->conversionType);
1695 *pErrorCode=U_UNSUPPORTED_ERROR;
1696 return 0;
1697 }
1698
1699 return headerSize+(int32_t)staticDataSize+size;
1700 }
1701
1702 #endif /* #if !UCONFIG_NO_LEGACY_CONVERSION */
1703
1704 #endif

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