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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 7.5 23-Dec-07  Version 8.00 ??-???-??
5    ----------------------
6    
7    1.  The table for translating pcre_compile() error codes into POSIX error codes
8        was out-of-date, and there was no check on the pcre_compile() error code
9        being within the table. This could lead to an OK return being given in
10        error.
11    
12    2.  Changed the call to open a subject file in pcregrep from fopen(pathname,
13        "r") to fopen(pathname, "rb"), which fixed a problem with some of the tests
14        in a Windows environment.
15    
16    3.  The pcregrep --count option prints the count for each file even when it is
17        zero, as does GNU grep. However, pcregrep was also printing all files when
18        --files-with-matches was added. Now, when both options are given, it prints
19        counts only for those files that have at least one match. (GNU grep just
20        prints the file name in this circumstance, but including the count seems
21        more useful - otherwise, why use --count?) Also ensured that the
22        combination -clh just lists non-zero counts, with no names.
23    
24    4.  The long form of the pcregrep -F option was incorrectly implemented as
25        --fixed_strings instead of --fixed-strings. This is an incompatible change,
26        but it seems right to fix it, and I didn't think it was worth preserving
27        the old behaviour.
28    
29    5.  The command line items --regex=pattern and --regexp=pattern were not
30        recognized by pcregrep, which required --regex pattern or --regexp pattern
31        (with a space rather than an '='). The man page documented the '=' forms,
32        which are compatible with GNU grep; these now work.
33    
34    6.  No libpcreposix.pc file was created for pkg-config; there was just
35        libpcre.pc and libpcrecpp.pc. The omission has been rectified.
36    
37    7.  Added #ifndef SUPPORT_UCP into the pcre_ucd.c module, to reduce its size
38        when UCP support is not needed, by modifying the Python script that
39        generates it from Unicode data files. This should not matter if the module
40        is correctly used as a library, but I received one complaint about 50K of
41        unwanted data. My guess is that the person linked everything into his
42        program rather than using a library. Anyway, it does no harm.
43    
44    8.  A pattern such as /\x{123}{2,2}+/8 was incorrectly compiled; the trigger
45        was a minimum greater than 1 for a wide character in a possessive
46        repetition. The same bug could also affect patterns like /(\x{ff}{0,2})*/8
47        which had an unlimited repeat of a nested, fixed maximum repeat of a wide
48        character. Chaos in the form of incorrect output or a compiling loop could
49        result.
50    
51    9.  The restrictions on what a pattern can contain when partial matching is
52        requested for pcre_exec() have been removed. All patterns can now be
53        partially matched by this function. In addition, if there are at least two
54        slots in the offset vector, the offset of the earliest inspected character
55        for the match and the offset of the end of the subject are set in them when
56        PCRE_ERROR_PARTIAL is returned.
57    
58    10. Partial matching has been split into two forms: PCRE_PARTIAL_SOFT, which is
59        synonymous with PCRE_PARTIAL, for backwards compatibility, and
60        PCRE_PARTIAL_HARD, which causes a partial match to supersede a full match,
61        and may be more useful for multi-segment matching, especially with
62        pcre_exec().
63    
64    11. Partial matching with pcre_exec() is now more intuitive. A partial match
65        used to be given if ever the end of the subject was reached; now it is
66        given only if matching could not proceed because another character was
67        needed. This makes a difference in some odd cases such as Z(*FAIL) with the
68        string "Z", which now yields "no match" instead of "partial match". In the
69        case of pcre_dfa_exec(), "no match" is given if every matching path for the
70        final character ended with (*FAIL).
71    
72    12. Restarting a match using pcre_dfa_exec() after a partial match did not work
73        if the pattern had a "must contain" character that was already found in the
74        earlier partial match, unless partial matching was again requested. For
75        example, with the pattern /dog.(body)?/, the "must contain" character is
76        "g". If the first part-match was for the string "dog", restarting with
77        "sbody" failed. This bug has been fixed.
78    
79    13. The string returned by pcre_dfa_exec() after a partial match has been
80        changed so that it starts at the first inspected character rather than the
81        first character of the match. This makes a difference only if the pattern
82        starts with a lookbehind assertion or \b or \B (\K is not supported by
83        pcre_dfa_exec()). It's an incompatible change, but it makes the two
84        matching functions compatible, and I think it's the right thing to do.
85    
86    14. Added a pcredemo man page, created automatically from the pcredemo.c file,
87        so that the demonstration program is easily available in environments where
88        PCRE has not been installed from source.
89    
90    15. Arranged to add -DPCRE_STATIC to cflags in libpcre.pc, libpcreposix.cp,
91        libpcrecpp.pc and pcre-config when PCRE is not compiled as a shared
92        library.
93    
94    16. Added REG_UNGREEDY to the pcreposix interface, at the request of a user.
95        It maps to PCRE_UNGREEDY. It is not, of course, POSIX-compatible, but it
96        is not the first non-POSIX option to be added. Clearly some people find
97        these options useful.
98    
99    17. If a caller to the POSIX matching function regexec() passes a non-zero
100        value for \fInmatch\fP with a NULL value for \fIpmatch\fP, the value of
101        \fInmatch\fP is forced to zero.
102    
103    
104    Version 7.9 11-Apr-09
105    ---------------------
106    
107    1.  When building with support for bzlib/zlib (pcregrep) and/or readline
108        (pcretest), all targets were linked against these libraries. This included
109        libpcre, libpcreposix, and libpcrecpp, even though they do not use these
110        libraries. This caused unwanted dependencies to be created. This problem
111        has been fixed, and now only pcregrep is linked with bzlib/zlib and only
112        pcretest is linked with readline.
113    
114    2.  The "typedef int BOOL" in pcre_internal.h that was included inside the
115        "#ifndef FALSE" condition by an earlier change (probably 7.8/18) has been
116        moved outside it again, because FALSE and TRUE are already defined in AIX,
117        but BOOL is not.
118    
119    3.  The pcre_config() function was treating the PCRE_MATCH_LIMIT and
120        PCRE_MATCH_LIMIT_RECURSION values as ints, when they should be long ints.
121    
122    4.  The pcregrep documentation said spaces were inserted as well as colons (or
123        hyphens) following file names and line numbers when outputting matching
124        lines. This is not true; no spaces are inserted. I have also clarified the
125        wording for the --colour (or --color) option.
126    
127    5.  In pcregrep, when --colour was used with -o, the list of matching strings
128        was not coloured; this is different to GNU grep, so I have changed it to be
129        the same.
130    
131    6.  When --colo(u)r was used in pcregrep, only the first matching substring in
132        each matching line was coloured. Now it goes on to look for further matches
133        of any of the test patterns, which is the same behaviour as GNU grep.
134    
135    7.  A pattern that could match an empty string could cause pcregrep to loop; it
136        doesn't make sense to accept an empty string match in pcregrep, so I have
137        locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
138        seems to be how GNU grep behaves.
139    
140    8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
141        start or after a newline", because the conditional assertion was not being
142        correctly handled. The rule now is that both the assertion and what follows
143        in the first alternative must satisfy the test.
144    
145    9.  If auto-callout was enabled in a pattern with a conditional group whose
146        condition was an assertion, PCRE could crash during matching, both with
147        pcre_exec() and pcre_dfa_exec().
148    
149    10. The PCRE_DOLLAR_ENDONLY option was not working when pcre_dfa_exec() was
150        used for matching.
151    
152    11. Unicode property support in character classes was not working for
153        characters (bytes) greater than 127 when not in UTF-8 mode.
154    
155    12. Added the -M command line option to pcretest.
156    
157    14. Added the non-standard REG_NOTEMPTY option to the POSIX interface.
158    
159    15. Added the PCRE_NO_START_OPTIMIZE match-time option.
160    
161    16. Added comments and documentation about mis-use of no_arg in the C++
162        wrapper.
163    
164    17. Implemented support for UTF-8 encoding in EBCDIC environments, a patch
165        from Martin Jerabek that uses macro names for all relevant character and
166        string constants.
167    
168    18. Added to pcre_internal.h two configuration checks: (a) If both EBCDIC and
169        SUPPORT_UTF8 are set, give an error; (b) If SUPPORT_UCP is set without
170        SUPPORT_UTF8, define SUPPORT_UTF8. The "configure" script handles both of
171        these, but not everybody uses configure.
172    
173    19. A conditional group that had only one branch was not being correctly
174        recognized as an item that could match an empty string. This meant that an
175        enclosing group might also not be so recognized, causing infinite looping
176        (and probably a segfault) for patterns such as ^"((?(?=[a])[^"])|b)*"$
177        with the subject "ab", where knowledge that the repeated group can match
178        nothing is needed in order to break the loop.
179    
180    20. If a pattern that was compiled with callouts was matched using pcre_dfa_
181        exec(), but without supplying a callout function, matching went wrong.
182    
183    21. If PCRE_ERROR_MATCHLIMIT occurred during a recursion, there was a memory
184        leak if the size of the offset vector was greater than 30. When the vector
185        is smaller, the saved offsets during recursion go onto a local stack
186        vector, but for larger vectors malloc() is used. It was failing to free
187        when the recursion yielded PCRE_ERROR_MATCH_LIMIT (or any other "abnormal"
188        error, in fact).
189    
190    22. There was a missing #ifdef SUPPORT_UTF8 round one of the variables in the
191        heapframe that is used only when UTF-8 support is enabled. This caused no
192        problem, but was untidy.
193    
194    23. Steven Van Ingelgem's patch to CMakeLists.txt to change the name
195        CMAKE_BINARY_DIR to PROJECT_BINARY_DIR so that it works when PCRE is
196        included within another project.
197    
198    24. Steven Van Ingelgem's patches to add more options to the CMake support,
199        slightly modified by me:
200    
201          (a) PCRE_BUILD_TESTS can be set OFF not to build the tests, including
202              not building pcregrep.
203    
204          (b) PCRE_BUILD_PCREGREP can be see OFF not to build pcregrep, but only
205              if PCRE_BUILD_TESTS is also set OFF, because the tests use pcregrep.
206    
207    25. Forward references, both numeric and by name, in patterns that made use of
208        duplicate group numbers, could behave incorrectly or give incorrect errors,
209        because when scanning forward to find the reference group, PCRE was not
210        taking into account the duplicate group numbers. A pattern such as
211        ^X(?3)(a)(?|(b)|(q))(Y) is an example.
212    
213    26. Changed a few more instances of "const unsigned char *" to USPTR, making
214        the feature of a custom pointer more persuasive (as requested by a user).
215    
216    27. Wrapped the definitions of fileno and isatty for Windows, which appear in
217        pcretest.c, inside #ifndefs, because it seems they are sometimes already
218        pre-defined.
219    
220    28. Added support for (*UTF8) at the start of a pattern.
221    
222    29. Arrange for flags added by the "release type" setting in CMake to be shown
223        in the configuration summary.
224    
225    
226    Version 7.8 05-Sep-08
227    ---------------------
228    
229    1.  Replaced UCP searching code with optimized version as implemented for Ad
230        Muncher (http://www.admuncher.com/) by Peter Kankowski. This uses a two-
231        stage table and inline lookup instead of a function, giving speed ups of 2
232        to 5 times on some simple patterns that I tested. Permission was given to
233        distribute the MultiStage2.py script that generates the tables (it's not in
234        the tarball, but is in the Subversion repository).
235    
236    2.  Updated the Unicode datatables to Unicode 5.1.0. This adds yet more
237        scripts.
238    
239    3.  Change 12 for 7.7 introduced a bug in pcre_study() when a pattern contained
240        a group with a zero qualifier. The result of the study could be incorrect,
241        or the function might crash, depending on the pattern.
242    
243    4.  Caseless matching was not working for non-ASCII characters in back
244        references. For example, /(\x{de})\1/8i was not matching \x{de}\x{fe}.
245        It now works when Unicode Property Support is available.
246    
247    5.  In pcretest, an escape such as \x{de} in the data was always generating
248        a UTF-8 string, even in non-UTF-8 mode. Now it generates a single byte in
249        non-UTF-8 mode. If the value is greater than 255, it gives a warning about
250        truncation.
251    
252    6.  Minor bugfix in pcrecpp.cc (change "" == ... to NULL == ...).
253    
254    7.  Added two (int) casts to pcregrep when printing the difference of two
255        pointers, in case they are 64-bit values.
256    
257    8.  Added comments about Mac OS X stack usage to the pcrestack man page and to
258        test 2 if it fails.
259    
260    9.  Added PCRE_CALL_CONVENTION just before the names of all exported functions,
261        and a #define of that name to empty if it is not externally set. This is to
262        allow users of MSVC to set it if necessary.
263    
264    10. The PCRE_EXP_DEFN macro which precedes exported functions was missing from
265        the convenience functions in the pcre_get.c source file.
266    
267    11. An option change at the start of a pattern that had top-level alternatives
268        could cause overwriting and/or a crash. This command provoked a crash in
269        some environments:
270    
271          printf "/(?i)[\xc3\xa9\xc3\xbd]|[\xc3\xa9\xc3\xbdA]/8\n" | pcretest
272    
273        This potential security problem was recorded as CVE-2008-2371.
274    
275    12. For a pattern where the match had to start at the beginning or immediately
276        after a newline (e.g /.*anything/ without the DOTALL flag), pcre_exec() and
277        pcre_dfa_exec() could read past the end of the passed subject if there was
278        no match. To help with detecting such bugs (e.g. with valgrind), I modified
279        pcretest so that it places the subject at the end of its malloc-ed buffer.
280    
281    13. The change to pcretest in 12 above threw up a couple more cases when pcre_
282        exec() might read past the end of the data buffer in UTF-8 mode.
283    
284    14. A similar bug to 7.3/2 existed when the PCRE_FIRSTLINE option was set and
285        the data contained the byte 0x85 as part of a UTF-8 character within its
286        first line. This applied both to normal and DFA matching.
287    
288    15. Lazy qualifiers were not working in some cases in UTF-8 mode. For example,
289        /^[^d]*?$/8 failed to match "abc".
290    
291    16. Added a missing copyright notice to pcrecpp_internal.h.
292    
293    17. Make it more clear in the documentation that values returned from
294        pcre_exec() in ovector are byte offsets, not character counts.
295    
296    18. Tidied a few places to stop certain compilers from issuing warnings.
297    
298    19. Updated the Virtual Pascal + BCC files to compile the latest v7.7, as
299        supplied by Stefan Weber. I made a further small update for 7.8 because
300        there is a change of source arrangements: the pcre_searchfuncs.c module is
301        replaced by pcre_ucd.c.
302    
303    
304    Version 7.7 07-May-08
305    ---------------------
306    
307    1.  Applied Craig's patch to sort out a long long problem: "If we can't convert
308        a string to a long long, pretend we don't even have a long long." This is
309        done by checking for the strtoq, strtoll, and _strtoi64 functions.
310    
311    2.  Applied Craig's patch to pcrecpp.cc to restore ABI compatibility with
312        pre-7.6 versions, which defined a global no_arg variable instead of putting
313        it in the RE class. (See also #8 below.)
314    
315    3.  Remove a line of dead code, identified by coverity and reported by Nuno
316        Lopes.
317    
318    4.  Fixed two related pcregrep bugs involving -r with --include or --exclude:
319    
320        (1) The include/exclude patterns were being applied to the whole pathnames
321            of files, instead of just to the final components.
322    
323        (2) If there was more than one level of directory, the subdirectories were
324            skipped unless they satisfied the include/exclude conditions. This is
325            inconsistent with GNU grep (and could even be seen as contrary to the
326            pcregrep specification - which I improved to make it absolutely clear).
327            The action now is always to scan all levels of directory, and just
328            apply the include/exclude patterns to regular files.
329    
330    5.  Added the --include_dir and --exclude_dir patterns to pcregrep, and used
331        --exclude_dir in the tests to avoid scanning .svn directories.
332    
333    6.  Applied Craig's patch to the QuoteMeta function so that it escapes the
334        NUL character as backslash + 0 rather than backslash + NUL, because PCRE
335        doesn't support NULs in patterns.
336    
337    7.  Added some missing "const"s to declarations of static tables in
338        pcre_compile.c and pcre_dfa_exec.c.
339    
340    8.  Applied Craig's patch to pcrecpp.cc to fix a problem in OS X that was
341        caused by fix #2  above. (Subsequently also a second patch to fix the
342        first patch. And a third patch - this was a messy problem.)
343    
344    9.  Applied Craig's patch to remove the use of push_back().
345    
346    10. Applied Alan Lehotsky's patch to add REG_STARTEND support to the POSIX
347        matching function regexec().
348    
349    11. Added support for the Oniguruma syntax \g<name>, \g<n>, \g'name', \g'n',
350        which, however, unlike Perl's \g{...}, are subroutine calls, not back
351        references. PCRE supports relative numbers with this syntax (I don't think
352        Oniguruma does).
353    
354    12. Previously, a group with a zero repeat such as (...){0} was completely
355        omitted from the compiled regex. However, this means that if the group
356        was called as a subroutine from elsewhere in the pattern, things went wrong
357        (an internal error was given). Such groups are now left in the compiled
358        pattern, with a new opcode that causes them to be skipped at execution
359        time.
360    
361    13. Added the PCRE_JAVASCRIPT_COMPAT option. This makes the following changes
362        to the way PCRE behaves:
363    
364        (a) A lone ] character is dis-allowed (Perl treats it as data).
365    
366        (b) A back reference to an unmatched subpattern matches an empty string
367            (Perl fails the current match path).
368    
369        (c) A data ] in a character class must be notated as \] because if the
370            first data character in a class is ], it defines an empty class. (In
371            Perl it is not possible to have an empty class.) The empty class []
372            never matches; it forces failure and is equivalent to (*FAIL) or (?!).
373            The negative empty class [^] matches any one character, independently
374            of the DOTALL setting.
375    
376    14. A pattern such as /(?2)[]a()b](abc)/ which had a forward reference to a
377        non-existent subpattern following a character class starting with ']' and
378        containing () gave an internal compiling error instead of "reference to
379        non-existent subpattern". Fortunately, when the pattern did exist, the
380        compiled code was correct. (When scanning forwards to check for the
381        existencd of the subpattern, it was treating the data ']' as terminating
382        the class, so got the count wrong. When actually compiling, the reference
383        was subsequently set up correctly.)
384    
385    15. The "always fail" assertion (?!) is optimzed to (*FAIL) by pcre_compile;
386        it was being rejected as not supported by pcre_dfa_exec(), even though
387        other assertions are supported. I have made pcre_dfa_exec() support
388        (*FAIL).
389    
390    16. The implementation of 13c above involved the invention of a new opcode,
391        OP_ALLANY, which is like OP_ANY but doesn't check the /s flag. Since /s
392        cannot be changed at match time, I realized I could make a small
393        improvement to matching performance by compiling OP_ALLANY instead of
394        OP_ANY for "." when DOTALL was set, and then removing the runtime tests
395        on the OP_ANY path.
396    
397    17. Compiling pcretest on Windows with readline support failed without the
398        following two fixes: (1) Make the unistd.h include conditional on
399        HAVE_UNISTD_H; (2) #define isatty and fileno as _isatty and _fileno.
400    
401    18. Changed CMakeLists.txt and cmake/FindReadline.cmake to arrange for the
402        ncurses library to be included for pcretest when ReadLine support is
403        requested, but also to allow for it to be overridden. This patch came from
404        Daniel Bergström.
405    
406    19. There was a typo in the file ucpinternal.h where f0_rangeflag was defined
407        as 0x00f00000 instead of 0x00800000. Luckily, this would not have caused
408        any errors with the current Unicode tables. Thanks to Peter Kankowski for
409        spotting this.
410    
411    
412    Version 7.6 28-Jan-08
413    ---------------------
414    
415    1.  A character class containing a very large number of characters with
416        codepoints greater than 255 (in UTF-8 mode, of course) caused a buffer
417        overflow.
418    
419    2.  Patch to cut out the "long long" test in pcrecpp_unittest when
420        HAVE_LONG_LONG is not defined.
421    
422    3.  Applied Christian Ehrlicher's patch to update the CMake build files to
423        bring them up to date and include new features. This patch includes:
424    
425        - Fixed PH's badly added libz and libbz2 support.
426        - Fixed a problem with static linking.
427        - Added pcredemo. [But later removed - see 7 below.]
428        - Fixed dftables problem and added an option.
429        - Added a number of HAVE_XXX tests, including HAVE_WINDOWS_H and
430            HAVE_LONG_LONG.
431        - Added readline support for pcretest.
432        - Added an listing of the option settings after cmake has run.
433    
434    4.  A user submitted a patch to Makefile that makes it easy to create
435        "pcre.dll" under mingw when using Configure/Make. I added stuff to
436        Makefile.am that cause it to include this special target, without
437        affecting anything else. Note that the same mingw target plus all
438        the other distribution libraries and programs are now supported
439        when configuring with CMake (see 6 below) instead of with
440        Configure/Make.
441    
442    5.  Applied Craig's patch that moves no_arg into the RE class in the C++ code.
443        This is an attempt to solve the reported problem "pcrecpp::no_arg is not
444        exported in the Windows port". It has not yet been confirmed that the patch
445        solves the problem, but it does no harm.
446    
447    6.  Applied Sheri's patch to CMakeLists.txt to add NON_STANDARD_LIB_PREFIX and
448        NON_STANDARD_LIB_SUFFIX for dll names built with mingw when configured
449        with CMake, and also correct the comment about stack recursion.
450    
451    7.  Remove the automatic building of pcredemo from the ./configure system and
452        from CMakeLists.txt. The whole idea of pcredemo.c is that it is an example
453        of a program that users should build themselves after PCRE is installed, so
454        building it automatically is not really right. What is more, it gave
455        trouble in some build environments.
456    
457    8.  Further tidies to CMakeLists.txt from Sheri and Christian.
458    
459    
460    Version 7.5 10-Jan-08
461  ---------------------  ---------------------
462    
463  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'  1.  Applied a patch from Craig: "This patch makes it possible to 'ignore'
# Line 99  Version 7.5 23-Dec-07 Line 555  Version 7.5 23-Dec-07
555    
556  20. In pcrecpp.cc, the variable 'count' was incremented twice in  20. In pcrecpp.cc, the variable 'count' was incremented twice in
557      RE::GlobalReplace(). As a result, the number of replacements returned was      RE::GlobalReplace(). As a result, the number of replacements returned was
558      double what it should be. I have removed one of the increments.      double what it should be. I removed one of the increments, but Craig sent a
559        later patch that removed the other one (the right fix) and added unit tests
560        that check the return values (which was not done before).
561    
562    21. Several CMake things:
563    
564        (1) Arranged that, when cmake is used on Unix, the libraries end up with
565            the names libpcre and libpcreposix, not just pcre and pcreposix.
566    
567        (2) The above change means that pcretest and pcregrep are now correctly
568            linked with the newly-built libraries, not previously installed ones.
569    
570        (3) Added PCRE_SUPPORT_LIBREADLINE, PCRE_SUPPORT_LIBZ, PCRE_SUPPORT_LIBBZ2.
571    
572    22. In UTF-8 mode, with newline set to "any", a pattern such as .*a.*=.b.*
573        crashed when matching a string such as a\x{2029}b (note that \x{2029} is a
574        UTF-8 newline character). The key issue is that the pattern starts .*;
575        this means that the match must be either at the beginning, or after a
576        newline. The bug was in the code for advancing after a failed match and
577        checking that the new position followed a newline. It was not taking
578        account of UTF-8 characters correctly.
579    
580    23. PCRE was behaving differently from Perl in the way it recognized POSIX
581        character classes. PCRE was not treating the sequence [:...:] as a
582        character class unless the ... were all letters. Perl, however, seems to
583        allow any characters between [: and :], though of course it rejects as
584        unknown any "names" that contain non-letters, because all the known class
585        names consist only of letters. Thus, Perl gives an error for [[:1234:]],
586        for example, whereas PCRE did not - it did not recognize a POSIX character
587        class. This seemed a bit dangerous, so the code has been changed to be
588        closer to Perl. The behaviour is not identical to Perl, because PCRE will
589        diagnose an unknown class for, for example, [[:l\ower:]] where Perl will
590        treat it as [[:lower:]]. However, PCRE does now give "unknown" errors where
591        Perl does, and where it didn't before.
592    
593    24. Rewrite so as to remove the single use of %n from pcregrep because in some
594        Windows environments %n is disabled by default.
595    
596    
597  Version 7.4 21-Sep-07  Version 7.4 21-Sep-07

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