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source: vbox/trunk/include/VBox/com/string.h@ 17646

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1/* $Id: string.h 17646 2009-03-10 17:47:31Z vboxsync $ */
2
3/** @file
4 * MS COM / XPCOM Abstraction Layer:
5 * Smart string classes declaration
6 */
7
8/*
9 * Copyright (C) 2006-2009 Sun Microsystems, Inc.
10 *
11 * This file is part of VirtualBox Open Source Edition (OSE), as
12 * available from http://www.virtualbox.org. This file is free software;
13 * you can redistribute it and/or modify it under the terms of the GNU
14 * General Public License (GPL) as published by the Free Software
15 * Foundation, in version 2 as it comes in the "COPYING" file of the
16 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
17 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
18 *
19 * The contents of this file may alternatively be used under the terms
20 * of the Common Development and Distribution License Version 1.0
21 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
22 * VirtualBox OSE distribution, in which case the provisions of the
23 * CDDL are applicable instead of those of the GPL.
24 *
25 * You may elect to license modified versions of this file under the
26 * terms and conditions of either the GPL or the CDDL or both.
27 *
28 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
29 * Clara, CA 95054 USA or visit http://www.sun.com if you need
30 * additional information or have any questions.
31 */
32
33#ifndef ___VBox_com_string_h
34#define ___VBox_com_string_h
35
36/* Make sure all the stdint.h macros are included - must come first! */
37#ifndef __STDC_LIMIT_MACROS
38# define __STDC_LIMIT_MACROS
39#endif
40#ifndef __STDC_CONSTANT_MACROS
41# define __STDC_CONSTANT_MACROS
42#endif
43
44#if defined (VBOX_WITH_XPCOM)
45# include <nsMemory.h>
46#endif
47
48#include "VBox/com/defs.h"
49#include "VBox/com/assert.h"
50
51#include <iprt/string.h>
52#include <iprt/cpputils.h>
53#include <iprt/alloc.h>
54
55namespace com
56{
57
58class Utf8Str;
59
60/**
61 * Helper class that represents the |BSTR| type and hides platform-specific
62 * implementation details.
63 *
64 * This class uses COM/XPCOM-provided memory management routines to allocate
65 * and free string buffers. This makes it possible to:
66 * - use it as a type of member variables of COM/XPCOM components and pass
67 * their values to callers through component methods' output parameters
68 * using the #cloneTo() operation;
69 * - adopt (take ownership of) string buffers returned in output parameters
70 * of COM methods using the #asOutParam() operation and correctly free them
71 * afterwards.
72 */
73class Bstr
74{
75public:
76
77 typedef BSTR String;
78 typedef CBSTR ConstString;
79
80 Bstr () : bstr (NULL) {}
81
82 Bstr (const Bstr &that) : bstr (NULL) { raw_copy (bstr, that.bstr); }
83 Bstr (CBSTR that) : bstr (NULL) { raw_copy (bstr, that); }
84
85#if defined (VBOX_WITH_XPCOM)
86 Bstr (const wchar_t *that) : bstr (NULL)
87 {
88 AssertCompile (sizeof (wchar_t) == sizeof (OLECHAR));
89 raw_copy (bstr, (CBSTR) that);
90 }
91#endif
92
93 Bstr (const Utf8Str &that);
94 Bstr (const char *that);
95
96 /** Shortcut that calls #alloc(aSize) right after object creation. */
97 Bstr (size_t aSize) : bstr (NULL) { alloc (aSize); }
98
99 ~Bstr () { setNull(); }
100
101 Bstr &operator = (const Bstr &that) { safe_assign (that.bstr); return *this; }
102 Bstr &operator = (CBSTR that) { safe_assign (that); return *this; }
103
104 Bstr &operator = (const Utf8Str &that);
105 Bstr &operator = (const char *that);
106
107 Bstr &setNull()
108 {
109 if (bstr)
110 {
111 ::SysFreeString (bstr);
112 bstr = NULL;
113 }
114 return *this;
115 }
116
117 Bstr &setNullIfEmpty()
118 {
119 if (bstr && *bstr == 0)
120 {
121 ::SysFreeString (bstr);
122 bstr = NULL;
123 }
124 return *this;
125 }
126
127 /**
128 * Allocates memory for a string capable to store \a aSize - 1 characters;
129 * in other words, aSize includes the terminating zero character. If \a aSize
130 * is zero, or if a memory allocation error occurs, this object will become null.
131 */
132 Bstr &alloc (size_t aSize)
133 {
134 setNull();
135 if (aSize)
136 {
137 unsigned int size = (unsigned int) aSize; Assert (size == aSize);
138 bstr = ::SysAllocStringLen (NULL, size - 1);
139 if (bstr)
140 bstr [0] = 0;
141 }
142 return *this;
143 }
144
145 int compare (CBSTR str) const
146 {
147 return ::RTUtf16Cmp ((PRTUTF16) bstr, (PRTUTF16) str);
148 }
149
150 int compare (BSTR str) const
151 {
152 return ::RTUtf16Cmp ((PRTUTF16) bstr, (PRTUTF16) str);
153 }
154
155 bool operator == (const Bstr &that) const { return !compare (that.bstr); }
156 bool operator != (const Bstr &that) const { return !!compare (that.bstr); }
157 bool operator == (CBSTR that) const { return !compare (that); }
158 bool operator == (BSTR that) const { return !compare (that); }
159
160#if defined (VBOX_WITH_XPCOM)
161 bool operator != (const wchar_t *that) const
162 {
163 AssertCompile (sizeof (wchar_t) == sizeof (OLECHAR));
164 return !!compare ((CBSTR) that);
165 }
166 bool operator == (const wchar_t *that) const
167 {
168 AssertCompile (sizeof (wchar_t) == sizeof (OLECHAR));
169 return !compare ((CBSTR) that);
170 }
171#endif
172
173 bool operator != (CBSTR that) const { return !!compare (that); }
174 bool operator != (BSTR that) const { return !!compare (that); }
175 bool operator < (const Bstr &that) const { return compare (that.bstr) < 0; }
176 bool operator < (CBSTR that) const { return compare (that) < 0; }
177 bool operator < (BSTR that) const { return compare (that) < 0; }
178#if defined (VBOX_WITH_XPCOM)
179 bool operator < (const wchar_t *that) const
180 {
181 AssertCompile (sizeof (wchar_t) == sizeof (OLECHAR));
182 return compare ((CBSTR) that) < 0;
183 }
184#endif
185
186 int compareIgnoreCase (CBSTR str) const
187 {
188 return ::RTUtf16LocaleICmp (bstr, str);
189 }
190
191 bool isNull() const { return bstr == NULL; }
192 operator bool() const { return !isNull(); }
193
194 bool isEmpty() const { return isNull() || *bstr == 0; }
195
196 size_t length() const { return isNull() ? 0 : ::RTUtf16Len ((PRTUTF16) bstr); }
197
198 /** Intended to to pass instances as |CBSTR| input parameters to methods. */
199 operator CBSTR () const { return bstr; }
200
201 /**
202 * Intended to to pass instances as |BSTR| input parameters to methods.
203 * Note that we have to provide this mutable BSTR operator since in MS COM
204 * input BSTR parameters of interface methods are not const.
205 */
206 operator BSTR () { return bstr; }
207
208 /**
209 * The same as operator CBSTR(), but for situations where the compiler
210 * cannot typecast implicitly (for example, in printf() argument list).
211 */
212 CBSTR raw() const { return bstr; }
213
214 /**
215 * Returns a non-const raw pointer that allows to modify the string directly.
216 * @warning
217 * Be sure not to modify data beyond the allocated memory! The
218 * guaranteed size of the allocated memory is at least #length()
219 * bytes after creation and after every assignment operation.
220 */
221 BSTR mutableRaw() { return bstr; }
222
223 /**
224 * Intended to assign copies of instances to |BSTR| out parameters from
225 * within the interface method. Transfers the ownership of the duplicated
226 * string to the caller.
227 */
228 const Bstr &cloneTo (BSTR *pstr) const
229 {
230 if (pstr)
231 {
232 *pstr = NULL;
233 raw_copy (*pstr, bstr);
234 }
235 return *this;
236 }
237
238 /**
239 * Intended to assign instances to |BSTR| out parameters from within the
240 * interface method. Transfers the ownership of the original string to the
241 * caller and resets the instance to null.
242 *
243 * As opposed to cloneTo(), this method doesn't create a copy of the
244 * string.
245 */
246 Bstr &detachTo (BSTR *pstr)
247 {
248 *pstr = bstr;
249 bstr = NULL;
250 return *this;
251 }
252
253 /**
254 * Intended to assign copies of instances to |char *| out parameters from
255 * within the interface method. Transfers the ownership of the duplicated
256 * string to the caller.
257 */
258 const Bstr &cloneTo (char **pstr) const;
259
260 /**
261 * Intended to pass instances as |BSTR| out parameters to methods.
262 * Takes the ownership of the returned data.
263 */
264 BSTR *asOutParam() { setNull(); return &bstr; }
265
266 /**
267 * Static immutable null object. May be used for comparison purposes.
268 */
269 static const Bstr Null;
270
271protected:
272
273 void safe_assign (CBSTR str)
274 {
275 if (bstr != str)
276 {
277 setNull();
278 raw_copy (bstr, str);
279 }
280 }
281
282 inline static void raw_copy (BSTR &ls, CBSTR rs)
283 {
284 if (rs)
285 ls = ::SysAllocString ((const OLECHAR *) rs);
286 }
287
288 inline static void raw_copy (BSTR &ls, const char *rs)
289 {
290 if (rs)
291 {
292 PRTUTF16 s = NULL;
293 ::RTStrToUtf16 (rs, &s);
294 raw_copy (ls, (BSTR) s);
295 ::RTUtf16Free (s);
296 }
297 }
298
299 BSTR bstr;
300
301 friend class Utf8Str; /* to access our raw_copy() */
302};
303
304/* symmetric compare operators */
305inline bool operator== (CBSTR l, const Bstr &r) { return r.operator== (l); }
306inline bool operator!= (CBSTR l, const Bstr &r) { return r.operator!= (l); }
307inline bool operator== (BSTR l, const Bstr &r) { return r.operator== (l); }
308inline bool operator!= (BSTR l, const Bstr &r) { return r.operator!= (l); }
309
310////////////////////////////////////////////////////////////////////////////////
311
312/**
313 * Helper class that represents UTF8 (|char *|) strings. Useful in
314 * conjunction with Bstr to simplify conversions between UTF16 (|BSTR|)
315 * and UTF8.
316 *
317 * This class uses COM/XPCOM-provided memory management routines to allocate
318 * and free string buffers. This makes it possible to:
319 * - use it as a type of member variables of COM/XPCOM components and pass
320 * their values to callers through component methods' output parameters
321 * using the #cloneTo() operation;
322 * - adopt (take ownership of) string buffers returned in output parameters
323 * of COM methods using the #asOutParam() operation and correctly free them
324 * afterwards.
325 */
326class Utf8Str
327{
328public:
329
330 typedef char *String;
331 typedef const char *ConstString;
332
333 Utf8Str () : str (NULL) {}
334
335 Utf8Str (const Utf8Str &that) : str (NULL) { raw_copy (str, that.str); }
336 Utf8Str (const char *that) : str (NULL) { raw_copy (str, that); }
337
338 Utf8Str (const Bstr &that) : str (NULL) { raw_copy (str, that); }
339 Utf8Str (CBSTR that) : str (NULL) { raw_copy (str, that); }
340
341 /** Shortcut that calls #alloc(aSize) right after object creation. */
342 Utf8Str (size_t aSize) : str (NULL) { alloc(aSize); }
343
344 virtual ~Utf8Str () { setNull(); }
345
346 Utf8Str &operator = (const Utf8Str &that) { safe_assign (that.str); return *this; }
347 Utf8Str &operator = (const char *that) { safe_assign (that); return *this; }
348
349 Utf8Str &operator = (const Bstr &that)
350 {
351 setNull();
352 raw_copy (str, that);
353 return *this;
354 }
355 Utf8Str &operator = (CBSTR that)
356 {
357 setNull();
358 raw_copy (str, that);
359 return *this;
360 }
361
362 Utf8Str &setNull()
363 {
364 if (str)
365 {
366#if !defined (VBOX_WITH_XPCOM)
367 ::RTStrFree (str);
368#else
369 nsMemory::Free (str);
370#endif
371 str = NULL;
372 }
373 return *this;
374 }
375
376 Utf8Str &setNullIfEmpty()
377 {
378 if (str && *str == 0)
379 {
380#if !defined (VBOX_WITH_XPCOM)
381 ::RTStrFree (str);
382#else
383 nsMemory::Free (str);
384#endif
385 str = NULL;
386 }
387 return *this;
388 }
389
390 /**
391 * Allocates memory for a string capable to store \a aSize - 1 bytes (not characters!);
392 * in other words, aSize includes the terminating zero character. If \a aSize
393 * is zero, or if a memory allocation error occurs, this object will become null.
394 */
395 Utf8Str &alloc (size_t aSize)
396 {
397 setNull();
398 if (aSize)
399 {
400#if !defined (VBOX_WITH_XPCOM)
401 str = (char *) ::RTMemTmpAlloc (aSize);
402#else
403 str = (char *) nsMemory::Alloc (aSize);
404#endif
405 if (str)
406 str [0] = 0;
407 }
408 return *this;
409 }
410
411 void append(const Utf8Str &that)
412 {
413 size_t cbThis = length();
414 size_t cbThat = that.length();
415
416 if (cbThat)
417 {
418 size_t cbBoth = cbThis + cbThat + 1;
419
420 // @todo optimize
421 char *pszTemp;
422#if !defined (VBOX_WITH_XPCOM)
423 pszTemp = (char*)::RTMemTmpAlloc(cbBoth);
424#else
425 pszTemp = (char*)nsMemory::Alloc(cbBoth);
426#endif
427 if (str)
428 {
429 memcpy(pszTemp, str, cbThis);
430 setNull();
431 }
432 if (that.str)
433 memcpy(pszTemp + cbThis, that.str, cbThat);
434 pszTemp[cbThis + cbThat] = '\0';
435
436 str = pszTemp;
437 }
438 }
439
440 int compare (const char *s) const
441 {
442 if (str == s)
443 return 0;
444 if (str == NULL)
445 return -1;
446 if (s == NULL)
447 return 1;
448
449 return ::strcmp (str, s);
450 }
451
452 bool operator == (const Utf8Str &that) const { return !compare (that.str); }
453 bool operator != (const Utf8Str &that) const { return !!compare (that.str); }
454 bool operator == (const char *that) const { return !compare (that); }
455 bool operator != (const char *that) const { return !!compare (that); }
456 bool operator < (const Utf8Str &that) const { return compare (that.str) < 0; }
457 bool operator < (const char *that) const { return compare (that) < 0; }
458
459 int compareIgnoreCase(const char *pcsz) const
460 {
461 return ::RTStrICmp(str, pcsz);
462 }
463
464 bool isNull() const { return str == NULL; }
465 operator bool() const { return !isNull(); }
466
467 bool isEmpty() const { return isNull() || *str == 0; }
468
469 size_t length() const { return isNull() ? 0 : ::strlen (str); }
470
471 /** Intended to to pass instances as input (|char *|) parameters to methods. */
472 operator const char *() const { return str; }
473
474 /** The same as operator const char *(), but for situations where the compiler
475 cannot typecast implicitly (for example, in printf() argument list). */
476 const char *raw() const { return str; }
477
478 /** The same as operator const char *(), but for situations where the compiler
479 cannot typecast implicitly (for example, in printf() argument list). */
480 const char *c_str() const { return str; }
481
482 /**
483 * Returns a non-const raw pointer that allows to modify the string directly.
484 * @warning
485 * Be sure not to modify data beyond the allocated memory! The
486 * guaranteed size of the allocated memory is at least #length()
487 * bytes after creation and after every assignment operation.
488 */
489 char *mutableRaw() { return str; }
490
491 /**
492 * Intended to assign instances to |char *| out parameters from within the
493 * interface method. Transfers the ownership of the duplicated string to the
494 * caller.
495 */
496 const Utf8Str &cloneTo (char **pstr) const
497 {
498 if (pstr)
499 {
500 *pstr = NULL;
501 raw_copy (*pstr, str);
502 }
503 return *this;
504 }
505
506 /**
507 * Intended to assign instances to |char *| out parameters from within the
508 * interface method. Transfers the ownership of the original string to the
509 * caller and resets the instance to null.
510 *
511 * As opposed to cloneTo(), this method doesn't create a copy of the
512 * string.
513 */
514 Utf8Str &detachTo (char **pstr)
515 {
516 *pstr = str;
517 str = NULL;
518 return *this;
519 }
520
521 /**
522 * Intended to assign instances to |BSTR| out parameters from within the
523 * interface method. Transfers the ownership of the duplicated string to the
524 * caller.
525 */
526 const Utf8Str &cloneTo (BSTR *pstr) const
527 {
528 if (pstr)
529 {
530 *pstr = NULL;
531 Bstr::raw_copy (*pstr, str);
532 }
533 return *this;
534 }
535
536 static const size_t npos;
537
538 /**
539 * Looks for pcszFind in "this" starting at "pos" and returns its position,
540 * counting from the beginning of "this" at 0. Returns npos if not found.
541 */
542 size_t find(const char *pcszFind, size_t pos = 0) const;
543
544 /**
545 * Returns a substring of "this" as a new Utf8Str. Works exactly like
546 * its equivalent in std::string except that this interprets pos and n
547 * as UTF-8 codepoints instead of bytes. With the default parameters "0"
548 * and "npos", this always copies the entire string.
549 * @param pos Index of first codepoint to copy from "this", counting from 0.
550 * @param n Number of codepoints to copy, starting with the one at "pos".
551 */
552 Utf8Str substr(size_t pos = 0, size_t n = npos) const;
553
554 /**
555 * Attempts to convert the member string into an unsigned 64-bit integer.
556 * @return IPRT error code.
557 * @param i Output buffer.
558 */
559 int toInt(uint64_t &i) const;
560
561 /**
562 * Attempts to convert the member string into an unsigned 32-bit integer.
563 * @return IPRT error code.
564 * @param i Output buffer.
565 */
566 int toInt(uint32_t &i) const;
567
568 /**
569 * Intended to pass instances as out (|char **|) parameters to methods.
570 * Takes the ownership of the returned data.
571 */
572 char **asOutParam() { setNull(); return &str; }
573
574 /**
575 * Static immutable null object. May be used for comparison purposes.
576 */
577 static const Utf8Str Null;
578
579protected:
580
581 void safe_assign (const char *s)
582 {
583 if (str != s)
584 {
585 setNull();
586 raw_copy (str, s);
587 }
588 }
589
590 inline static void raw_copy (char *&ls, const char *rs)
591 {
592 if (rs)
593#if !defined (VBOX_WITH_XPCOM)
594 ::RTStrDupEx (&ls, rs);
595#else
596 ls = (char *) nsMemory::Clone (rs, strlen (rs) + 1);
597#endif
598 }
599
600 inline static void raw_copy (char *&ls, CBSTR rs)
601 {
602 if (rs)
603 {
604#if !defined (VBOX_WITH_XPCOM)
605 ::RTUtf16ToUtf8 ((PRTUTF16) rs, &ls);
606#else
607 char *s = NULL;
608 ::RTUtf16ToUtf8 ((PRTUTF16) rs, &s);
609 raw_copy (ls, s);
610 ::RTStrFree (s);
611#endif
612 }
613 }
614
615 char *str;
616
617 friend class Bstr; /* to access our raw_copy() */
618};
619
620// symmetric compare operators
621inline bool operator== (const char *l, const Utf8Str &r) { return r.operator== (l); }
622inline bool operator!= (const char *l, const Utf8Str &r) { return r.operator!= (l); }
623
624// work around error C2593 of the stupid MSVC 7.x ambiguity resolver
625WORKAROUND_MSVC7_ERROR_C2593_FOR_BOOL_OP (Bstr)
626WORKAROUND_MSVC7_ERROR_C2593_FOR_BOOL_OP (Utf8Str)
627
628////////////////////////////////////////////////////////////////////////////////
629
630// inlined Bstr members that depend on Utf8Str
631
632inline Bstr::Bstr (const Utf8Str &that) : bstr (NULL) { raw_copy (bstr, that); }
633inline Bstr::Bstr (const char *that) : bstr (NULL) { raw_copy (bstr, that); }
634
635inline Bstr &Bstr::operator = (const Utf8Str &that)
636{
637 setNull();
638 raw_copy (bstr, that);
639 return *this;
640}
641inline Bstr &Bstr::operator = (const char *that)
642{
643 setNull();
644 raw_copy (bstr, that);
645 return *this;
646}
647
648inline const Bstr &Bstr::cloneTo (char **pstr) const
649{
650 if (pstr) {
651 *pstr = NULL;
652 Utf8Str::raw_copy (*pstr, bstr);
653 }
654 return *this;
655}
656
657////////////////////////////////////////////////////////////////////////////////
658
659/**
660 * This class is a printf-like formatter for Utf8Str strings. Its purpose is
661 * to construct Utf8Str objects from a format string and a list of arguments
662 * for the format string.
663 *
664 * The usage of this class is like the following:
665 * <code>
666 * Utf8StrFmt string ("program name = %s", argv[0]);
667 * </code>
668 */
669class Utf8StrFmt : public Utf8Str
670{
671public:
672
673 /**
674 * Constructs a new string given the format string and the list
675 * of the arguments for the format string.
676 *
677 * @param format printf-like format string (in UTF-8 encoding)
678 * @param ... list of the arguments for the format string
679 */
680 explicit Utf8StrFmt (const char *format, ...)
681 {
682 va_list args;
683 va_start (args, format);
684 init (format, args);
685 va_end (args);
686 }
687
688protected:
689
690 Utf8StrFmt() {}
691
692 void init (const char *format, va_list args);
693
694private:
695
696 static DECLCALLBACK(size_t) strOutput (void *pvArg, const char *pachChars,
697 size_t cbChars);
698};
699
700/**
701 * This class is a vprintf-like formatter for Utf8Str strings. It is
702 * identical to Utf8StrFmt except that its constructor takes a va_list
703 * argument instead of ellipsis.
704 *
705 * Note that a separate class is necessary because va_list is defined as
706 * |char *| on most platforms. For this reason, if we had two overloaded
707 * constructors in Utf8StrFmt (one taking ellipsis and another one taking
708 * va_list) then composing a constructor call using exactly two |char *|
709 * arguments would cause the compiler to use the va_list overload instead of
710 * the ellipsis one which is obviously wrong. The compiler would choose
711 * va_list because ellipsis has the lowest rank when it comes to resolving
712 * overloads, as opposed to va_list which is an exact match for |char *|.
713 */
714class Utf8StrFmtVA : public Utf8StrFmt
715{
716public:
717
718 /**
719 * Constructs a new string given the format string and the list
720 * of the arguments for the format string.
721 *
722 * @param format printf-like format string (in UTF-8 encoding)
723 * @param args list of arguments for the format string
724 */
725 Utf8StrFmtVA (const char *format, va_list args) { init (format, args); }
726};
727
728/**
729 * The BstrFmt class is a shortcut to <tt>Bstr (Utf8StrFmt (...))</tt>.
730 */
731class BstrFmt : public Bstr
732{
733public:
734
735 /**
736 * Constructs a new string given the format string and the list of the
737 * arguments for the format string.
738 *
739 * @param aFormat printf-like format string (in UTF-8 encoding).
740 * @param ... List of the arguments for the format string.
741 */
742 explicit BstrFmt (const char *aFormat, ...)
743 {
744 va_list args;
745 va_start (args, aFormat);
746 raw_copy (bstr, Utf8StrFmtVA (aFormat, args));
747 va_end (args);
748 }
749};
750
751/**
752 * The BstrFmtVA class is a shortcut to <tt>Bstr (Utf8StrFmtVA (...))</tt>.
753 */
754class BstrFmtVA : public Bstr
755{
756public:
757
758 /**
759 * Constructs a new string given the format string and the list of the
760 * arguments for the format string.
761 *
762 * @param aFormat printf-like format string (in UTF-8 encoding).
763 * @param aArgs List of arguments for the format string
764 */
765 BstrFmtVA (const char *aFormat, va_list aArgs)
766 {
767 raw_copy (bstr, Utf8StrFmtVA (aFormat, aArgs));
768 }
769};
770
771} /* namespace com */
772
773#endif /* ___VBox_com_string_h */
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