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revision 678 by ph10, Sun Aug 28 15:23:03 2011 UTC revision 776 by ph10, Thu Dec 1 11:02:56 2011 UTC
# Line 41  PCRE - Perl-compatible regular expressio Line 41  PCRE - Perl-compatible regular expressio
41  .PP  .PP
42  .B void pcre_jit_stack_free(pcre_jit_stack *\fIstack\fP);  .B void pcre_jit_stack_free(pcre_jit_stack *\fIstack\fP);
43  .PP  .PP
44  .B void pcre_assign_jit_stack(pcre_extra *\fIextra\fP,  .B void pcre_assign_jit_stack(pcre_extra *\fIextra\fP,
45  .ti +5n  .ti +5n
46  .B pcre_jit_callback \fIcallback\fP, void *\fIdata\fP);  .B pcre_jit_callback \fIcallback\fP, void *\fIdata\fP);
47  .PP  .PP
# Line 111  PCRE - Perl-compatible regular expressio Line 111  PCRE - Perl-compatible regular expressio
111  .B int pcre_config(int \fIwhat\fP, void *\fIwhere\fP);  .B int pcre_config(int \fIwhat\fP, void *\fIwhere\fP);
112  .PP  .PP
113  .B char *pcre_version(void);  .B char *pcre_version(void);
114  .PP  .
115    .
116    .SH "PCRE NATIVE API INDIRECTED FUNCTIONS"
117    .rs
118    .sp
119  .B void *(*pcre_malloc)(size_t);  .B void *(*pcre_malloc)(size_t);
120  .PP  .PP
121  .B void (*pcre_free)(void *);  .B void (*pcre_free)(void *);
# Line 168  documentation, and the Line 172  documentation, and the
172  documentation describes how to compile and run it.  documentation describes how to compile and run it.
173  .P  .P
174  Just-in-time compiler support is an optional feature of PCRE that can be built  Just-in-time compiler support is an optional feature of PCRE that can be built
175  in appropriate hardware environments. It greatly speeds up the matching  in appropriate hardware environments. It greatly speeds up the matching
176  performance of many patterns. Simple programs can request its use if available.  performance of many patterns. Simple programs can easily request that it be
177  More complicated programs might need to make use of the  used if available, by setting an option that is ignored when it is not
178  \fBpcre_jit_stack_alloc()\fP, \fBpcre_jit_stack_free()\fP, and  relevant. More complicated programs might need to make use of the functions
179  \fBpcre_assign_jit_stack()\fP functions in order to control its memory usage.  \fBpcre_jit_stack_alloc()\fP, \fBpcre_jit_stack_free()\fP, and
180    \fBpcre_assign_jit_stack()\fP in order to control the JIT code's memory usage.
181  These functions are discussed in the  These functions are discussed in the
182  .\" HREF  .\" HREF
183  \fBpcrejit\fP  \fBpcrejit\fP
# Line 310  callout function pointed to by \fBpcre_c Line 315  callout function pointed to by \fBpcre_c
315  The compiled form of a regular expression is not altered during matching, so  The compiled form of a regular expression is not altered during matching, so
316  the same compiled pattern can safely be used by several threads at once.  the same compiled pattern can safely be used by several threads at once.
317  .P  .P
318  If the just-in-time optimization feature is being used, it needs separate  If the just-in-time optimization feature is being used, it needs separate
319  memory stack areas for each thread. See the  memory stack areas for each thread. See the
320  .\" HREF  .\" HREF
321  \fBpcrejit\fP  \fBpcrejit\fP
# Line 360  properties is available; otherwise it is Line 365  properties is available; otherwise it is
365  .sp  .sp
366    PCRE_CONFIG_JIT    PCRE_CONFIG_JIT
367  .sp  .sp
368  The output is an integer that is set to one if support for just-in-time  The output is an integer that is set to one if support for just-in-time
369  compiling is available; otherwise it is set to zero.  compiling is available; otherwise it is set to zero.
370  .sp  .sp
371    PCRE_CONFIG_NEWLINE    PCRE_CONFIG_NEWLINE
372  .sp  .sp
# Line 638  character). Thus, the pattern AB]CD beco Line 643  character). Thus, the pattern AB]CD beco
643  string (by default this causes the current matching alternative to fail). A  string (by default this causes the current matching alternative to fail). A
644  pattern such as (\e1)(a) succeeds when this option is set (assuming it can find  pattern such as (\e1)(a) succeeds when this option is set (assuming it can find
645  an "a" in the subject), whereas it fails by default, for Perl compatibility.  an "a" in the subject), whereas it fails by default, for Perl compatibility.
646    .P
647    (3) \eU matches an upper case "U" character; by default \eU causes a compile
648    time error (Perl uses \eU to upper case subsequent characters).
649    .P
650    (4) \eu matches a lower case "u" character unless it is followed by four
651    hexadecimal digits, in which case the hexadecimal number defines the code point
652    to match. By default, \eu causes a compile time error (Perl uses it to upper
653    case the following character).
654    .P
655    (5) \ex matches a lower case "x" character unless it is followed by two
656    hexadecimal digits, in which case the hexadecimal number defines the code point
657    to match. By default, as in Perl, a hexadecimal number is always expected after
658    \ex, but it may have zero, one, or two digits (so, for example, \exz matches a
659    binary zero character followed by z).
660  .sp  .sp
661    PCRE_MULTILINE    PCRE_MULTILINE
662  .sp  .sp
# Line 883  If studying the pattern does not produce Line 902  If studying the pattern does not produce
902  wants to pass any of the other fields to \fBpcre_exec()\fP or  wants to pass any of the other fields to \fBpcre_exec()\fP or
903  \fBpcre_dfa_exec()\fP, it must set up its own \fBpcre_extra\fP block.  \fBpcre_dfa_exec()\fP, it must set up its own \fBpcre_extra\fP block.
904  .P  .P
905  The second argument of \fBpcre_study()\fP contains option bits. There is only  The second argument of \fBpcre_study()\fP contains option bits. There is only
906  one option: PCRE_STUDY_JIT_COMPILE. If this is set, and the just-in-time  one option: PCRE_STUDY_JIT_COMPILE. If this is set, and the just-in-time
907  compiler is available, the pattern is further compiled into machine code that  compiler is available, the pattern is further compiled into machine code that
908  executes much faster than the \fBpcre_exec()\fP matching function. If  executes much faster than the \fBpcre_exec()\fP matching function. If
909  the just-in-time compiler is not available, this option is ignored. All other  the just-in-time compiler is not available, this option is ignored. All other
910  bits in the \fIoptions\fP argument must be zero.  bits in the \fIoptions\fP argument must be zero.
911  .P  .P
912  JIT compilation is a heavyweight optimization. It can take some time for  JIT compilation is a heavyweight optimization. It can take some time for
913  patterns to be analyzed, and for one-off matches and simple patterns the  patterns to be analyzed, and for one-off matches and simple patterns the
914  benefit of faster execution might be offset by a much slower study time.  benefit of faster execution might be offset by a much slower study time.
915  Not all patterns can be optimized by the JIT compiler. For those that cannot be  Not all patterns can be optimized by the JIT compiler. For those that cannot be
916  handled, matching automatically falls back to the \fBpcre_exec()\fP  handled, matching automatically falls back to the \fBpcre_exec()\fP
917  interpreter. For more details, see the  interpreter. For more details, see the
918  .\" HREF  .\" HREF
# Line 915  API for release 8.20. For earlier versio Line 934  API for release 8.20. For earlier versio
934  where PCRE_STUDY_JIT_COMPILE is not used, but it is advisable to change to the  where PCRE_STUDY_JIT_COMPILE is not used, but it is advisable to change to the
935  new function when convenient.  new function when convenient.
936  .P  .P
937  This is a typical way in which \fBpcre_study\fP() is used (except that in a  This is a typical way in which \fBpcre_study\fP() is used (except that in a
938  real application there should be tests for errors):  real application there should be tests for errors):
939  .sp  .sp
940    int rc;    int rc;
# Line 927  real application there should be tests f Line 946  real application there should be tests f
946      0,              /* no options */      0,              /* no options */
947      &error);        /* set to NULL or points to a message */      &error);        /* set to NULL or points to a message */
948    rc = pcre_exec(   /* see below for details of pcre_exec() options */    rc = pcre_exec(   /* see below for details of pcre_exec() options */
949      re, sd, "subject", 7, 0, 0, ovector, 30);      re, sd, "subject", 7, 0, 0, ovector, 30);
950    ...    ...
951    pcre_free_study(sd);    pcre_free_study(sd);
952    pcre_free(re);    pcre_free(re);
953  .sp  .sp
954  Studying a pattern does two things: first, a lower bound for the length of  Studying a pattern does two things: first, a lower bound for the length of
955  subject string that is needed to match the pattern is computed. This does not  subject string that is needed to match the pattern is computed. This does not
# Line 945  single fixed starting character. A bitma Line 964  single fixed starting character. A bitma
964  created. This speeds up finding a position in the subject at which to start  created. This speeds up finding a position in the subject at which to start
965  matching.  matching.
966  .P  .P
967  These two optimizations apply to both \fBpcre_exec()\fP and  These two optimizations apply to both \fBpcre_exec()\fP and
968  \fBpcre_dfa_exec()\fP. However, they are not used by \fBpcre_exec()\fP if  \fBpcre_dfa_exec()\fP. However, they are not used by \fBpcre_exec()\fP if
969  \fBpcre_study()\fP is called with the PCRE_STUDY_JIT_COMPILE option, and  \fBpcre_study()\fP is called with the PCRE_STUDY_JIT_COMPILE option, and
970  just-in-time compiling is successful. The optimizations can be disabled by  just-in-time compiling is successful. The optimizations can be disabled by
971  setting the PCRE_NO_START_OPTIMIZE option when calling \fBpcre_exec()\fP or  setting the PCRE_NO_START_OPTIMIZE option when calling \fBpcre_exec()\fP or
# Line 1117  Return 1 if the (?J) or (?-J) option set Line 1136  Return 1 if the (?J) or (?-J) option set
1136  .sp  .sp
1137    PCRE_INFO_JIT    PCRE_INFO_JIT
1138  .sp  .sp
1139  Return 1 if the pattern was studied with the PCRE_STUDY_JIT_COMPILE option, and  Return 1 if the pattern was studied with the PCRE_STUDY_JIT_COMPILE option, and
1140  just-in-time compiling was successful. The fourth argument should point to an  just-in-time compiling was successful. The fourth argument should point to an
1141  \fBint\fP variable. A return value of 0 means that JIT support is not available  \fBint\fP variable. A return value of 0 means that JIT support is not available
1142  in this version of PCRE, or that the pattern was not studied with the  in this version of PCRE, or that the pattern was not studied with the
1143  PCRE_STUDY_JIT_COMPILE option, or that the JIT compiler could not handle this  PCRE_STUDY_JIT_COMPILE option, or that the JIT compiler could not handle this
1144  particular pattern. See the  particular pattern. See the
1145  .\" HREF  .\" HREF
1146  \fBpcrejit\fP  \fBpcrejit\fP
# Line 1243  For such patterns, the PCRE_ANCHORED bit Line 1262  For such patterns, the PCRE_ANCHORED bit
1262  .sp  .sp
1263    PCRE_INFO_SIZE    PCRE_INFO_SIZE
1264  .sp  .sp
1265  Return the size of the compiled pattern, that is, the value that was passed as  Return the size of the compiled pattern. The fourth argument should point to a
1266  the argument to \fBpcre_malloc()\fP when PCRE was getting memory in which to  \fBsize_t\fP variable. This value does not include the size of the \fBpcre\fP
1267  place the compiled data. The fourth argument should point to a \fBsize_t\fP  structure that is returned by \fBpcre_compile()\fP. The value that is passed as
1268  variable.  the argument to \fBpcre_malloc()\fP when \fBpcre_compile()\fP is getting memory
1269    in which to place the compiled data is the value returned by this option plus
1270    the size of the \fBpcre\fP structure. Studying a compiled pattern, with or
1271    without JIT, does not alter the value returned by this option.
1272  .sp  .sp
1273    PCRE_INFO_STUDYSIZE    PCRE_INFO_STUDYSIZE
1274  .sp  .sp
# Line 1326  is different. (This seems a highly unlik Line 1348  is different. (This seems a highly unlik
1348  The function \fBpcre_exec()\fP is called to match a subject string against a  The function \fBpcre_exec()\fP is called to match a subject string against a
1349  compiled pattern, which is passed in the \fIcode\fP argument. If the  compiled pattern, which is passed in the \fIcode\fP argument. If the
1350  pattern was studied, the result of the study should be passed in the  pattern was studied, the result of the study should be passed in the
1351  \fIextra\fP argument. This function is the main matching facility of the  \fIextra\fP argument. You can call \fBpcre_exec()\fP with the same \fIcode\fP
1352  library, and it operates in a Perl-like manner. For specialist use there is  and \fIextra\fP arguments as many times as you like, in order to match
1353  also an alternative matching function, which is described  different subject strings with the same pattern.
1354    .P
1355    This function is the main matching facility of the library, and it operates in
1356    a Perl-like manner. For specialist use there is also an alternative matching
1357    function, which is described
1358  .\" HTML <a href="#dfamatch">  .\" HTML <a href="#dfamatch">
1359  .\" </a>  .\" </a>
1360  below  below
# Line 1372  fields (not necessarily in this order): Line 1398  fields (not necessarily in this order):
1398  .sp  .sp
1399    unsigned long int \fIflags\fP;    unsigned long int \fIflags\fP;
1400    void *\fIstudy_data\fP;    void *\fIstudy_data\fP;
1401    void *\fIexecutable_jit\fP;    void *\fIexecutable_jit\fP;
1402    unsigned long int \fImatch_limit\fP;    unsigned long int \fImatch_limit\fP;
1403    unsigned long int \fImatch_limit_recursion\fP;    unsigned long int \fImatch_limit_recursion\fP;
1404    void *\fIcallout_data\fP;    void *\fIcallout_data\fP;
# Line 1383  The \fIflags\fP field is a bitmap that s Line 1409  The \fIflags\fP field is a bitmap that s
1409  are set. The flag bits are:  are set. The flag bits are:
1410  .sp  .sp
1411    PCRE_EXTRA_STUDY_DATA    PCRE_EXTRA_STUDY_DATA
1412    PCRE_EXTRA_EXECUTABLE_JIT    PCRE_EXTRA_EXECUTABLE_JIT
1413    PCRE_EXTRA_MATCH_LIMIT    PCRE_EXTRA_MATCH_LIMIT
1414    PCRE_EXTRA_MATCH_LIMIT_RECURSION    PCRE_EXTRA_MATCH_LIMIT_RECURSION
1415    PCRE_EXTRA_CALLOUT_DATA    PCRE_EXTRA_CALLOUT_DATA
# Line 1406  calls repeatedly (sometimes recursively) Line 1432  calls repeatedly (sometimes recursively)
1432  imposed on the number of times this function is called during a match, which  imposed on the number of times this function is called during a match, which
1433  has the effect of limiting the amount of backtracking that can take place. For  has the effect of limiting the amount of backtracking that can take place. For
1434  patterns that are not anchored, the count restarts from zero for each position  patterns that are not anchored, the count restarts from zero for each position
1435  in the subject string.  in the subject string.
1436  .P  .P
1437  When \fBpcre_exec()\fP is called with a pattern that was successfully studied  When \fBpcre_exec()\fP is called with a pattern that was successfully studied
1438  with the PCRE_STUDY_JIT_COMPILE option, the way that the matching is executed  with the PCRE_STUDY_JIT_COMPILE option, the way that the matching is executed
1439  is entirely different. However, there is still the possibility of runaway  is entirely different. However, there is still the possibility of runaway
1440  matching that goes on for a very long time, and so the \fImatch_limit\fP value  matching that goes on for a very long time, and so the \fImatch_limit\fP value
1441  is also used in this case (but in a different way) to limit how long the  is also used in this case (but in a different way) to limit how long the
1442  matching can continue.  matching can continue.
# Line 1426  The \fImatch_limit_recursion\fP field is Line 1452  The \fImatch_limit_recursion\fP field is
1452  instead of limiting the total number of times that \fBmatch()\fP is called, it  instead of limiting the total number of times that \fBmatch()\fP is called, it
1453  limits the depth of recursion. The recursion depth is a smaller number than the  limits the depth of recursion. The recursion depth is a smaller number than the
1454  total number of calls, because not all calls to \fBmatch()\fP are recursive.  total number of calls, because not all calls to \fBmatch()\fP are recursive.
1455  This limit is of use only if it is set smaller than \fImatch_limit\fP.  This limit is of use only if it is set smaller than \fImatch_limit\fP.
1456  .P  .P
1457  Limiting the recursion depth limits the amount of machine stack that can be  Limiting the recursion depth limits the amount of machine stack that can be
1458  used, or, when PCRE has been compiled to use memory on the heap instead of the  used, or, when PCRE has been compiled to use memory on the heap instead of the
1459  stack, the amount of heap memory that can be used. This limit is relevant, and  stack, the amount of heap memory that can be used. This limit is not relevant,
1460  is ignored, when the pattern was successfully studied with  and is ignored, if the pattern was successfully studied with
1461  PCRE_STUDY_JIT_COMPILE.  PCRE_STUDY_JIT_COMPILE.
1462  .P  .P
1463  The default value for \fImatch_limit_recursion\fP can be set when PCRE is  The default value for \fImatch_limit_recursion\fP can be set when PCRE is
# Line 1491  zero. The only bits that may be set are Line 1517  zero. The only bits that may be set are
1517  PCRE_NOTBOL, PCRE_NOTEOL, PCRE_NOTEMPTY, PCRE_NOTEMPTY_ATSTART,  PCRE_NOTBOL, PCRE_NOTEOL, PCRE_NOTEMPTY, PCRE_NOTEMPTY_ATSTART,
1518  PCRE_NO_START_OPTIMIZE, PCRE_NO_UTF8_CHECK, PCRE_PARTIAL_SOFT, and  PCRE_NO_START_OPTIMIZE, PCRE_NO_UTF8_CHECK, PCRE_PARTIAL_SOFT, and
1519  PCRE_PARTIAL_HARD.  PCRE_PARTIAL_HARD.
1520    .P
1521    If the pattern was successfully studied with the PCRE_STUDY_JIT_COMPILE option,
1522    the only supported options for JIT execution are PCRE_NO_UTF8_CHECK,
1523    PCRE_NOTBOL, PCRE_NOTEOL, PCRE_NOTEMPTY, and PCRE_NOTEMPTY_ATSTART. Note in
1524    particular that partial matching is not supported. If an unsupported option is
1525    used, JIT execution is disabled and the normal interpretive code in
1526    \fBpcre_exec()\fP is run.
1527  .sp  .sp
1528    PCRE_ANCHORED    PCRE_ANCHORED
1529  .sp  .sp
# Line 1797  string that it matched that is returned. Line 1830  string that it matched that is returned.
1830  .P  .P
1831  If the vector is too small to hold all the captured substring offsets, it is  If the vector is too small to hold all the captured substring offsets, it is
1832  used as far as possible (up to two-thirds of its length), and the function  used as far as possible (up to two-thirds of its length), and the function
1833  returns a value of zero. If the substring offsets are not of interest,  returns a value of zero. If neither the actual string matched not any captured
1834  \fBpcre_exec()\fP may be called with \fIovector\fP passed as NULL and  substrings are of interest, \fBpcre_exec()\fP may be called with \fIovector\fP
1835  \fIovecsize\fP as zero. However, if the pattern contains back references and  passed as NULL and \fIovecsize\fP as zero. However, if the pattern contains
1836  the \fIovector\fP is not big enough to remember the related substrings, PCRE  back references and the \fIovector\fP is not big enough to remember the related
1837  has to get additional memory for use during matching. Thus it is usually  substrings, PCRE has to get additional memory for use during matching. Thus it
1838  advisable to supply an \fIovector\fP.  is usually advisable to supply an \fIovector\fP of reasonable size.
1839    .P
1840    There are some cases where zero is returned (indicating vector overflow) when
1841    in fact the vector is exactly the right size for the final match. For example,
1842    consider the pattern
1843    .sp
1844      (a)(?:(b)c|bd)
1845    .sp
1846    If a vector of 6 elements (allowing for only 1 captured substring) is given
1847    with subject string "abd", \fBpcre_exec()\fP will try to set the second
1848    captured string, thereby recording a vector overflow, before failing to match
1849    "c" and backing up to try the second alternative. The zero return, however,
1850    does correctly indicate that the maximum number of slots (namely 2) have been
1851    filled. In similar cases where there is temporary overflow, but the final
1852    number of used slots is actually less than the maximum, a non-zero value is
1853    returned.
1854  .P  .P
1855  The \fBpcre_fullinfo()\fP function can be used to find out how many capturing  The \fBpcre_fullinfo()\fP function can be used to find out how many capturing
1856  subpatterns there are in a compiled pattern. The smallest size for  subpatterns there are in a compiled pattern. The smallest size for
# Line 1823  return from the function is 2, because t Line 1871  return from the function is 2, because t
1871  number is 1, and the offsets for for the second and third capturing subpatterns  number is 1, and the offsets for for the second and third capturing subpatterns
1872  (assuming the vector is large enough, of course) are set to -1.  (assuming the vector is large enough, of course) are set to -1.
1873  .P  .P
1874  \fBNote\fP: Elements of \fIovector\fP that do not correspond to capturing  \fBNote\fP: Elements in the first two-thirds of \fIovector\fP that do not
1875  parentheses in the pattern are never changed. That is, if a pattern contains  correspond to capturing parentheses in the pattern are never changed. That is,
1876  \fIn\fP capturing parentheses, no more than \fIovector[0]\fP to  if a pattern contains \fIn\fP capturing parentheses, no more than
1877  \fIovector[2n+1]\fP are set by \fBpcre_exec()\fP. The other elements retain  \fIovector[0]\fP to \fIovector[2n+1]\fP are set by \fBpcre_exec()\fP. The other
1878  whatever values they previously had.  elements (in the first two-thirds) retain whatever values they previously had.
1879  .P  .P
1880  Some convenience functions are provided for extracting the captured substrings  Some convenience functions are provided for extracting the captured substrings
1881  as separate strings. These are described below.  as separate strings. These are described below.
# Line 1982  time. Line 2030  time.
2030  .sp  .sp
2031    PCRE_ERROR_JIT_STACKLIMIT (-27)    PCRE_ERROR_JIT_STACKLIMIT (-27)
2032  .sp  .sp
2033  This error is returned when a pattern that was successfully studied using the  This error is returned when a pattern that was successfully studied using the
2034  PCRE_STUDY_JIT_COMPILE option is matched, but the memory available for the  PCRE_STUDY_JIT_COMPILE option is being matched, but the memory available for
2035  just-in-time processing stack is not large enough. See the  the just-in-time processing stack is not large enough. See the
2036  .\" HREF  .\" HREF
2037  \fBpcrejit\fP  \fBpcrejit\fP
2038  .\"  .\"
2039  documentation for more details.  documentation for more details.
2040  .P  .P
2041  Error numbers -16 to -20 and -22 are not used by \fBpcre_exec()\fP.  Error numbers -16 to -20 and -22 are not used by \fBpcre_exec()\fP.
2042  .  .
# Line 2229  names are not included in the compiled c Line 2277  names are not included in the compiled c
2277  numbers. For this reason, the use of different names for subpatterns of the  numbers. For this reason, the use of different names for subpatterns of the
2278  same number causes an error at compile time.  same number causes an error at compile time.
2279  .  .
2280    .
2281  .SH "DUPLICATE SUBPATTERN NAMES"  .SH "DUPLICATE SUBPATTERN NAMES"
2282  .rs  .rs
2283  .sp  .sp
# Line 2428  returns data, even though the meaning of Line 2477  returns data, even though the meaning of
2477  The strings are returned in reverse order of length; that is, the longest  The strings are returned in reverse order of length; that is, the longest
2478  matching string is given first. If there were too many matches to fit into  matching string is given first. If there were too many matches to fit into
2479  \fIovector\fP, the yield of the function is zero, and the vector is filled with  \fIovector\fP, the yield of the function is zero, and the vector is filled with
2480  the longest matches.  the longest matches. Unlike \fBpcre_exec()\fP, \fBpcre_dfa_exec()\fP can use
2481    the entire \fIovector\fP for returning matched strings.
2482  .  .
2483  .  .
2484  .SS "Error returns from \fBpcre_dfa_exec()\fP"  .SS "Error returns from \fBpcre_dfa_exec()\fP"
# Line 2497  Cambridge CB2 3QH, England. Line 2547  Cambridge CB2 3QH, England.
2547  .rs  .rs
2548  .sp  .sp
2549  .nf  .nf
2550  Last updated: 27 August 2011  Last updated: 01 December 2011
2551  Copyright (c) 1997-2011 University of Cambridge.  Copyright (c) 1997-2011 University of Cambridge.
2552  .fi  .fi

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