pcre_internal.h

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  1+LINK_SIZE,                   /* Assert                                 */ \
  1+LINK_SIZE,                   /* Assert not                             */ \
  1+LINK_SIZE,                   /* Assert behind                          */ \
  1+LINK_SIZE,                   /* Assert behind not                      */ \
  1+LINK_SIZE,                   /* Reverse                                */ \
  1+LINK_SIZE,                   /* ONCE                                   */ \
  1+LINK_SIZE,                   /* BRA                                    */ \
  3+LINK_SIZE,                   /* CBRA                                   */ \
  1+LINK_SIZE,                   /* COND                                   */ \
  1+LINK_SIZE,                   /* SBRA                                   */ \
  3+LINK_SIZE,                   /* SCBRA                                  */ \
  1+LINK_SIZE,                   /* SCOND                                  */ \
  3,                             /* CREF                                   */ \
  3,                             /* RREF                                   */ \
  1,                             /* DEF                                    */ \
  1, 1,                          /* BRAZERO, BRAMINZERO                    */ \
  1, 1, 1, 1,                    /* PRUNE, SKIP, THEN, COMMIT,             */ \
  1, 1                           /* FAIL, ACCEPT                           */


/* A magic value for OP_RREF to indicate the "any recursion" condition. */

#define RREF_ANY  0xffff

/* Error code numbers. They are given names so that they can more easily be
tracked. */

enum { ERR0,  ERR1,  ERR2,  ERR3,  ERR4,  ERR5,  ERR6,  ERR7,  ERR8,  ERR9,
       ERR10, ERR11, ERR12, ERR13, ERR14, ERR15, ERR16, ERR17, ERR18, ERR19,
       ERR20, ERR21, ERR22, ERR23, ERR24, ERR25, ERR26, ERR27, ERR28, ERR29,
       ERR30, ERR31, ERR32, ERR33, ERR34, ERR35, ERR36, ERR37, ERR38, ERR39,
       ERR40, ERR41, ERR42, ERR43, ERR44, ERR45, ERR46, ERR47, ERR48, ERR49,
       ERR50, ERR51, ERR52, ERR53, ERR54, ERR55, ERR56, ERR57, ERR58, ERR59,
       ERR60, ERR61 };

/* The real format of the start of the pcre block; the index of names and the
code vector run on as long as necessary after the end. We store an explicit
offset to the name table so that if a regex is compiled on one host, saved, and
then run on another where the size of pointers is different, all might still
be well. For the case of compiled-on-4 and run-on-8, we include an extra
pointer that is always NULL. For future-proofing, a few dummy fields were
originally included - even though you can never get this planning right - but
there is only one left now.

NOTE NOTE NOTE:
Because people can now save and re-use compiled patterns, any additions to this
structure should be made at the end, and something earlier (e.g. a new
flag in the options or one of the dummy fields) should indicate that the new
fields are present. Currently PCRE always sets the dummy fields to zero.
NOTE NOTE NOTE:
*/

typedef struct real_pcre {
  pcre_uint32 magic_number;
  pcre_uint32 size;               /* Total that was malloced */
  pcre_uint32 options;            /* Public options */
  pcre_uint16 flags;              /* Private flags */
  pcre_uint16 dummy1;             /* For future use */
  pcre_uint16 top_bracket;
  pcre_uint16 top_backref;
  pcre_uint16 first_byte;
  pcre_uint16 req_byte;
  pcre_uint16 name_table_offset;  /* Offset to name table that follows */
  pcre_uint16 name_entry_size;    /* Size of any name items */
  pcre_uint16 name_count;         /* Number of name items */
  pcre_uint16 ref_count;          /* Reference count */

  const unsigned char *tables;    /* Pointer to tables or NULL for std */
  const unsigned char *nullpad;   /* NULL padding */
} real_pcre;

/* The format of the block used to store data from pcre_study(). The same
remark (see NOTE above) about extending this structure applies. */

typedef struct pcre_study_data {
  pcre_uint32 size;               /* Total that was malloced */
  pcre_uint32 options;
  uschar start_bits[32];
} pcre_study_data;

/* Structure for passing "static" information around between the functions
doing the compiling, so that they are thread-safe. */

typedef struct compile_data {
  const uschar *lcc;            /* Points to lower casing table */
  const uschar *fcc;            /* Points to case-flipping table */
  const uschar *cbits;          /* Points to character type table */
  const uschar *ctypes;         /* Points to table of type maps */
  const uschar *start_workspace;/* The start of working space */
  const uschar *start_code;     /* The start of the compiled code */
  const uschar *start_pattern;  /* The start of the pattern */
  const uschar *end_pattern;    /* The end of the pattern */
  uschar *hwm;                  /* High watermark of workspace */
  uschar *name_table;           /* The name/number table */
  int  names_found;             /* Number of entries so far */
  int  name_entry_size;         /* Size of each entry */
  int  bracount;                /* Count of capturing parens */
  int  top_backref;             /* Maximum back reference */
  unsigned int backref_map;     /* Bitmap of low back refs */
  int  external_options;        /* External (initial) options */
  int  external_flags;          /* External flag bits to be set */
  int  req_varyopt;             /* "After variable item" flag for reqbyte */
  BOOL had_accept;              /* (*ACCEPT) encountered */
  int  nltype;                  /* Newline type */
  int  nllen;                   /* Newline string length */
  uschar nl[4];                 /* Newline string when fixed length */
} compile_data;

/* Structure for maintaining a chain of pointers to the currently incomplete
branches, for testing for left recursion. */

typedef struct branch_chain {
  struct branch_chain *outer;
  uschar *current;
} branch_chain;

/* Structure for items in a linked list that represents an explicit recursive
call within the pattern. */

typedef struct recursion_info {
  struct recursion_info *prevrec; /* Previous recursion record (or NULL) */
  int group_num;                /* Number of group that was called */
  const uschar *after_call;     /* "Return value": points after the call in the expr */
  USPTR save_start;             /* Old value of mstart */
  int *offset_save;             /* Pointer to start of saved offsets */
  int saved_max;                /* Number of saved offsets */
} recursion_info;

/* Structure for building a chain of data for holding the values of the subject
pointer at the start of each subpattern, so as to detect when an empty string
has been matched by a subpattern - to break infinite loops. */

typedef struct eptrblock {
  struct eptrblock *epb_prev;
  USPTR epb_saved_eptr;
} eptrblock;


/* Structure for passing "static" information around between the functions
doing traditional NFA matching, so that they are thread-safe. */

typedef struct match_data {
  unsigned long int match_call_count;      /* As it says */
  unsigned long int match_limit;           /* As it says */
  unsigned long int match_limit_recursion; /* As it says */
  int   *offset_vector;         /* Offset vector */
  int    offset_end;            /* One past the end */
  int    offset_max;            /* The maximum usable for return data */
  int    nltype;                /* Newline type */
  int    nllen;                 /* Newline string length */
  uschar nl[4];                 /* Newline string when fixed */
  const uschar *lcc;            /* Points to lower casing table */
  const uschar *ctypes;         /* Points to table of type maps */
  BOOL   offset_overflow;       /* Set if too many extractions */
  BOOL   notbol;                /* NOTBOL flag */
  BOOL   noteol;                /* NOTEOL flag */
  BOOL   utf8;                  /* UTF8 flag */
  BOOL   endonly;               /* Dollar not before final \n */
  BOOL   notempty;              /* Empty string match not wanted */
  BOOL   partial;               /* PARTIAL flag */
  BOOL   hitend;                /* Hit the end of the subject at some point */
  BOOL   bsr_anycrlf;           /* \R is just any CRLF, not full Unicode */
  const uschar *start_code;     /* For use when recursing */
  USPTR  start_subject;         /* Start of the subject string */
  USPTR  end_subject;           /* End of the subject string */
  USPTR  start_match_ptr;       /* Start of matched string */
  USPTR  end_match_ptr;         /* Subject position at end match */
  int    end_offset_top;        /* Highwater mark at end of match */
  int    capture_last;          /* Most recent capture number */
  int    start_offset;          /* The start offset value */
  eptrblock *eptrchain;         /* Chain of eptrblocks for tail recursions */
  int    eptrn;                 /* Next free eptrblock */
  recursion_info *recursive;    /* Linked list of recursion data */
  void  *callout_data;          /* To pass back to callouts */
} match_data;

/* A similar structure is used for the same purpose by the DFA matching
functions. */

typedef struct dfa_match_data {
  const uschar *start_code;     /* Start of the compiled pattern */
  const uschar *start_subject;  /* Start of the subject string */
  const uschar *end_subject;    /* End of subject string */
  const uschar *tables;         /* Character tables */
  int   moptions;               /* Match options */
  int   poptions;               /* Pattern options */
  int    nltype;                /* Newline type */
  int    nllen;                 /* Newline string length */
  uschar nl[4];                 /* Newline string when fixed */
  void  *callout_data;          /* To pass back to callouts */
} dfa_match_data;

/* Bit definitions for entries in the pcre_ctypes table. */

#define ctype_space   0x01
#define ctype_letter  0x02
#define ctype_digit   0x04
#define ctype_xdigit  0x08
#define ctype_word    0x10   /* alphameric or '_' */
#define ctype_meta    0x80   /* regexp meta char or zero (end pattern) */

/* Offsets for the bitmap tables in pcre_cbits. Each table contains a set
of bits for a class map. Some classes are built by combining these tables. */

#define cbit_space     0      /* [:space:] or \s */
#define cbit_xdigit   32      /* [:xdigit:] */
#define cbit_digit    64      /* [:digit:] or \d */
#define cbit_upper    96      /* [:upper:] */
#define cbit_lower   128      /* [:lower:] */
#define cbit_word    160      /* [:word:] or \w */
#define cbit_graph   192      /* [:graph:] */
#define cbit_print   224      /* [:print:] */
#define cbit_punct   256      /* [:punct:] */
#define cbit_cntrl   288      /* [:cntrl:] */
#define cbit_length  320      /* Length of the cbits table */

/* Offsets of the various tables from the base tables pointer, and
total length. */

#define lcc_offset      0
#define fcc_offset    256
#define cbits_offset  512
#define ctypes_offset (cbits_offset + cbit_length)
#define tables_length (ctypes_offset + 256)

/* Layout of the UCP type table that translates property names into types and
codes. Each entry used to point directly to a name, but to reduce the number of
relocations in shared libraries, it now has an offset into a single string
instead. */

typedef struct {
  pcre_uint16 name_offset;
  pcre_uint16 type;
  pcre_uint16 value;
} ucp_type_table;


/* Internal shared data tables. These are tables that are used by more than one
of the exported public functions. They have to be "external" in the C sense,
but are not part of the PCRE public API. The data for these tables is in the
pcre_tables.c module. */

extern const int    _pcre_utf8_table1[];
extern const int    _pcre_utf8_table2[];
extern const int    _pcre_utf8_table3[];
extern const uschar _pcre_utf8_table4[];

extern const int    _pcre_utf8_table1_size;

extern const char   _pcre_utt_names[];
extern const ucp_type_table _pcre_utt[];
extern const int _pcre_utt_size;

extern const uschar _pcre_default_tables[];

extern const uschar _pcre_OP_lengths[];


/* Internal shared functions. These are functions that are used by more than
one of the exported public functions. They have to be "external" in the C
sense, but are not part of the PCRE public API. */

extern BOOL         _pcre_is_newline(const uschar *, int, const uschar *,
                      int *, BOOL);
extern int          _pcre_ord2utf8(int, uschar *);
extern real_pcre   *_pcre_try_flipped(const real_pcre *, real_pcre *,
                      const pcre_study_data *, pcre_study_data *);
extern int          _pcre_ucp_findprop(const unsigned int, int *, int *);
extern unsigned int _pcre_ucp_othercase(const unsigned int);
extern int          _pcre_valid_utf8(const uschar *, int);
extern BOOL         _pcre_was_newline(const uschar *, int, const uschar *,
                      int *, BOOL);
extern BOOL         _pcre_xclass(int, const uschar *);

#endif

/* End of pcre_internal.h */