lib/index.h

   1 /*
   2  *      Sherlock Gatherer: Data structures used in indices
   3  *
   4  *      (c) 2001 Martin Mares <mj@ucw.cz>
   5  */
   6
   7 /* Words */
   8
   9 #define MAX_WORD_LEN            64
  10
  11 /* Word types */
  12
  13 enum word_type {
  14   WT_RESERVED,                          /* Reserved word type */
  15   WT_TEXT,                              /* Ordinary text */
  16   WT_EMPH,                              /* Emphasized text */
  17   WT_SMALL,                             /* Small font */
  18   WT_TITLE,                             /* Document title */
  19   WT_SMALL_HEADING,                     /* Heading */
  20   WT_BIG_HEADING,                       /* Larger heading */
  21   WT_KEYWORD,                           /* Explicitly marked keyword */
  22   WT_META,                              /* Various meta-information */
  23   WT_ALT,                               /* Alternate texts for graphical elements */
  24   WT_MAX
  25 };
  26
  27 /* Descriptive names used for user output */
  28 #define WORD_TYPE_USER_NAMES                                                    \
  29    "reserved", "text", "emph", "small", "title", "hdr1", "hdr2", "keywd",       \
  30    "meta", "alt", "type10", "type11", "type12", "type13", "type14", "type15"
  31
  32 /* Keywords for word type names */
  33 #define WORD_TYPE_NAMES                         \
  34         T(WORD, ~0)                             \
  35         T(TEXT, 1 << WT_TEXT)                   \
  36         T(EMPH, 1 << WT_EMPH)                   \
  37         T(SMALL, 1 << WT_SMALL)                 \
  38         T(TITLE, 1 << WT_TITLE)                 \
  39         T(HDR, (1 << WT_SMALL_HEADING) | (1 << WT_BIG_HEADING))  \
  40         T(HDR1, 1 << WT_SMALL_HEADING)          \
  41         T(HDR2, 1 << WT_BIG_HEADING)            \
  42         T(KEYWD, 1 << WT_KEYWORD)               \
  43         T(META, 1 << WT_META)                   \
  44         T(ALT, 1 << WT_ALT)
  45
  46 /* String types */
  47
  48 enum string_type {
  49   ST_RESERVED,                          /* Reserved string type */
  50   ST_URL,                               /* URL of the document */
  51   ST_HOST,                              /* Host name */
  52   ST_DOMAIN,                            /* Domain name */
  53   ST_REF,                               /* URL reference */
  54   ST_BACKREF,                           /* Back-reference (frame or redirect source) */
  55   ST_MAX
  56 };
  57
  58 #define STRING_TYPE_USER_NAMES                                                  \
  59    "URL", "host", "domain", "ref", "backref", "type5", "type6", "type7",        \
  60    "type8", "type9", "type10", "type11", "type12", "type13", "type14", "type15"
  61
  62 #define STRING_TYPE_NAMES                       \
  63         T(URL, 1 << ST_URL)                     \
  64         T(HOST, 1 << ST_HOST)                   \
  65         T(DOMAIN, 1 << ST_DOMAIN)               \
  66         T(REF, 1 << ST_REF)                     \
  67         T(BACKREF, 1 << ST_BACKREF)
  68
  69 #define STRING_TYPES_URL ((1 << ST_URL) | (1 << ST_REF) | (1 << ST_BACKREF))
  70 /* These must be indexed in lowercase form */
  71 #define STRING_TYPES_CASE_INSENSITIVE ((1 << ST_HOST) | (1 << ST_DOMAIN))
  72
  73 /* Index card attributes */
  74
  75 struct card_attr {
  76   u32 card;                             /* Reference to card description (either oid or filepos) */
  77   u32 site_id;
  78   byte weight;
  79   byte flags;
  80   byte rfu[2];
  81 };
  82
  83 enum card_flag {
  84   CARD_FLAG_EMPTY = 1,                  /* Empty document (redirect, robot file etc.) [scanner] */
  85   CARD_FLAG_ACCENTED = 2,               /* Document contains accented characters [scanner] */
  86   CARD_FLAG_DUP = 4,                    /* Removed as a duplicate [merger] */
  87   CARD_FLAG_MERGED = 8,                 /* Destination of a merge [merger] */
  88 };
  89
  90 #define CARD_POS_SHIFT 5                /* Card positions are shifted this # of bytes to the right */
  91
  92 /* String fingerprints */
  93
  94 struct fingerprint {
  95   byte hash[12];
  96 };
  97
  98 void fingerprint(byte *string, struct fingerprint *fp);
  99
 100 static inline u32
 101 fp_hash(struct fingerprint *fp)
 102 {
 103   return (fp->hash[0] << 24) | (fp->hash[1] << 16) | (fp->hash[2] << 8) | fp->hash[3];
 104 }
 105
 106 /* Reading of tagged text (Unicode values, tags mapped to 0x80000000 and higher) */
 107
 108 #define GET_TAGGED_CHAR(p,u) do {                               \
 109   u = *p;                                                       \
 110   if (u >= 0xc0)                                                \
 111     GET_UTF8(p,u);                                              \
 112   else if (u >= 0x80)                                           \
 113     {                                                           \
 114       p++;                                                      \
 115       if (u >= 0xb0)                                            \
 116         {                                                       \
 117           if (u != 0xb0)                                        \
 118             ASSERT(0);                                          \
 119           u += 0x80020000;                                      \
 120         }                                                       \
 121       else if (u >= 0xa0)                                       \
 122         {                                                       \
 123           ASSERT(*p >= 0x80 && *p <= 0xbf);                     \
 124           u = 0x80010000 + ((u & 0x0f) << 6) + (*p++ & 0x3f);   \
 125         }                                                       \
 126       else                                                      \
 127         u += 0x80000000;                                        \
 128     }                                                           \
 129   else                                                          \
 130     p++;                                                        \
 131 } while (0)