/*
- * Copyright (C) 1994, Index Data I/S
+ * Copyright (C) 1994-1999, Index Data
* All rights reserved.
* Sebastian Hammer, Adam Dickmeiss
*
* $Log: insert.c,v $
- * Revision 1.11 1995-09-04 12:33:31 adam
+ * Revision 1.21 1999-05-26 07:49:12 adam
+ * C++ compilation.
+ *
+ * Revision 1.20 1999/05/15 14:36:37 adam
+ * Updated dictionary. Implemented "compression" of dictionary.
+ *
+ * Revision 1.19 1999/02/02 14:50:22 adam
+ * Updated WIN32 code specific sections. Changed header.
+ *
+ * Revision 1.18 1998/03/05 08:17:24 adam
+ * Added a few comments - no code changed.
+ *
+ * Revision 1.17 1996/05/14 15:49:09 adam
+ * Bug fix: In function split_page. In rare cases variable best_indxp was
+ * referenced.
+ *
+ * Revision 1.16 1996/02/02 13:43:50 adam
+ * The public functions simply use char instead of Dict_char to represent
+ * search strings. Dict_char is used internally only.
+ *
+ * Revision 1.15 1996/02/01 20:39:59 adam
+ * Bug fix: insert didn't work on 8-bit characters due to unsigned char
+ * compares in dict_strcmp (strcmp) and signed Dict_char. Dict_char is
+ * unsigned now.
+ *
+ * Revision 1.14 1995/12/07 11:48:56 adam
+ * Insert operation obeys DICT_type = 1 (slack in page).
+ * Function dict_open exists if page size or magic aren't right.
+ *
+ * Revision 1.13 1995/11/28 09:06:37 adam
+ * Fixed potential dangling pointer.
+ *
+ * Revision 1.12 1995/09/06 10:34:44 adam
+ * Memcpy in clean_page edited to satisfy checkergcc.
+ *
+ * Revision 1.11 1995/09/04 12:33:31 adam
* Various cleanup. YAZ util used instead.
*
* Revision 1.10 1994/10/05 12:16:48 adam
static Dict_ptr new_page (Dict dict, Dict_ptr back_ptr, void **pp)
{
void *p;
- Dict_ptr ptr = dict->head.free_list;
- if (dict->head.free_list == dict->head.last)
+ Dict_ptr ptr = dict->head.last;
+ if (!dict->head.freelist)
{
- dict->head.free_list++;
- dict->head.last = dict->head.free_list;
- dict_bf_newp (dict->dbf, ptr, &p);
+ dict_bf_newp (dict->dbf, dict->head.last, &p, dict->head.page_size);
+ (dict->head.last)++;
}
else
{
- dict_bf_readp (dict->dbf, dict->head.free_list, &p);
- dict->head.free_list = DICT_nextptr(p);
- if (dict->head.free_list == 0)
- dict->head.free_list = dict->head.last;
+ ptr = dict->head.freelist;
+ dict_bf_readp (dict->dbf, ptr, &p);
+ dict->head.freelist = DICT_backptr(p);
}
assert (p);
DICT_type(p) = 0;
DICT_backptr(p) = back_ptr;
- DICT_nextptr(p) = 0;
DICT_nodir(p) = 0;
DICT_size(p) = DICT_infoffset;
+ DICT_bsize(p) = dict->head.page_size;
if (pp)
*pp = p;
return ptr;
void *subp;
char *info_here;
Dict_ptr subptr;
- int i;
+ int i, j;
short *indxp, *best_indxp = NULL;
Dict_char best_char = 0;
Dict_char prev_char = 0;
int best_no = -1, no_current = 1;
/* determine splitting char... */
- indxp = (short*) ((char*) p+DICT_pagesize(dict)-sizeof(short));
+ indxp = (short*) ((char*) p+DICT_bsize(p)-sizeof(short));
for (i = DICT_nodir (p); --i >= 0; --indxp)
{
if (*indxp > 0) /* tail string here! */
{ /* first entry met */
best_char = prev_char = dc;
best_no = 1;
+ best_indxp = indxp;
}
else if (prev_char == dc)
{ /* same char prefix. update */
if (best_no < 0) /* we didn't find any tail string entry at all! */
return -1;
+ j = best_indxp - (short*) p;
subptr = new_page (dict, ptr, &subp);
/* scan entries to see if there is a string with */
/* length 1. info_here indicates if such entry exist */
info_here = NULL;
- for (indxp=best_indxp, i=0; i<best_no; i++, indxp++)
+ for (i=0; i<best_no; i++, j++)
{
char *info, *info1;
int slen;
+ Dict_char dc;
- assert (*indxp > 0);
-
- info = (char*) p + *indxp; /* entry start */
- assert (*info == best_char);
- slen = dict_strlen(info);
+ info = (char*) p + ((short*) p)[j];
+ /* entry start */
+ memcpy (&dc, info, sizeof(dc));
+ assert (dc == best_char);
+ slen = 1+dict_strlen((Dict_char*) info);
- assert (slen > 0);
- if (slen == 1)
+ assert (slen > 1);
+ if (slen == 2)
{
assert (!info_here);
- info_here = info+(slen+1)*sizeof(Dict_char);
+ info_here = info+slen*sizeof(Dict_char);
}
else
{
- info1 = info+(1+slen)*sizeof(Dict_char); /* info start */
- dict_ins (dict, info+sizeof(Dict_char), subptr, *info1, info1+1);
+ info1 = info+slen*sizeof(Dict_char); /* info start */
+ dict_ins (dict, (Dict_char*) (info+sizeof(Dict_char)),
+ subptr, *info1, info1+1);
dict_bf_readp (dict->dbf, ptr, &p);
}
}
}
static void clean_page (Dict dict, Dict_ptr ptr, void *p, Dict_char *out,
- Dict_ptr subptr, char *userinfo)
+ Dict_ptr subptr, char *userinfo)
{
- char *np = xmalloc (dict->head.page_size);
+ char *np = (char *) xmalloc (dict->head.page_size);
int i, slen, no = 0;
short *indxp1, *indxp2;
char *info1, *info2;
- indxp1 = (short*) ((char*) p+DICT_pagesize(dict)-sizeof(short));
- indxp2 = (short*) ((char*) np+DICT_pagesize(dict));
+ DICT_bsize(np) = dict->head.page_size;
+ indxp1 = (short*) ((char*) p+DICT_bsize(p)-sizeof(short));
+ indxp2 = (short*) ((char*) np+DICT_bsize(np));
info2 = (char*) np + DICT_infoffset;
for (i = DICT_nodir (p); --i >= 0; --indxp1)
{
continue;
}
*--indxp2 = info2 - np;
- slen = (dict_strlen(info1)+1)*sizeof(Dict_char);
+ slen = (dict_strlen((Dict_char*) info1)+1)*sizeof(Dict_char);
memcpy (info2, info1, slen);
info1 += slen;
info2 += slen;
info2 += slen;
++no;
}
+#if 1
+ memcpy ((char*)p+DICT_infoffset,
+ (char*)np+DICT_infoffset,
+ info2 - ((char*)np+DICT_infoffset));
+ memcpy ((char*)p + ((char*)indxp2 - (char*)np),
+ indxp2,
+ ((char*) np+DICT_bsize(p)) - (char*)indxp2);
+#else
memcpy ((char*)p+DICT_infoffset, (char*)np+DICT_infoffset,
DICT_pagesize(dict)-DICT_infoffset);
+#endif
DICT_size(p) = info2 - np;
DICT_type(p) = 0;
DICT_nodir(p) = no;
/* return 2 if same as before */
static int dict_ins (Dict dict, const Dict_char *str,
- Dict_ptr back_ptr, int userlen, void *userinfo)
+ Dict_ptr ptr, int userlen, void *userinfo)
{
int hi, lo, mid, slen, cmp = 1;
- Dict_ptr ptr = back_ptr;
short *indxp;
char *info;
void *p;
- if (ptr == 0)
- ptr = new_page (dict, back_ptr, &p);
- else
- dict_bf_readp (dict->dbf, ptr, &p);
+ dict_bf_readp (dict->dbf, ptr, &p);
assert (p);
assert (ptr);
mid = lo = 0;
hi = DICT_nodir(p)-1;
- indxp = (short*) ((char*) p+DICT_pagesize(dict)-sizeof(short));
+ indxp = (short*) ((char*) p+DICT_bsize(p)-sizeof(short));
while (lo <= hi)
{
mid = (lo+hi)/2;
cmp = dict_strcmp((Dict_char*) info, str);
if (!cmp)
{
- info += (dict_strlen(info)+1)*sizeof(Dict_char);
+ info += (dict_strlen((Dict_char*) info)+1)*sizeof(Dict_char);
/* consider change of userinfo length... */
if (*info == userlen)
{
+ /* change of userinfo ? */
if (memcmp (info+1, userinfo, userlen))
{
dict_bf_touch (dict->dbf, ptr);
memcpy (info+1, userinfo, userlen);
return 1;
}
+ /* same userinfo */
return 2;
}
else if (*info > userlen)
{
+ /* room for new userinfo */
DICT_type(p) = 1;
*info = userlen;
dict_bf_touch (dict->dbf, ptr);
memcpy (&subptr, info, sizeof(Dict_ptr));
if (*++str == DICT_EOS)
{
- int xlen;
-
- xlen = info[sizeof(Dict_ptr)+sizeof(Dict_char)];
+ /* finish of string. Store userinfo here... */
+
+ int xlen = info[sizeof(Dict_ptr)+sizeof(Dict_char)];
if (xlen == userlen)
{
if (memcmp (info+sizeof(Dict_ptr)+sizeof(Dict_char)+1,
dict_bf_touch (dict->dbf, ptr);
return 1;
}
+ /* xlen < userlen, expanding needed ... */
if (DICT_size(p)+sizeof(Dict_char)+sizeof(Dict_ptr)+
userlen >=
- DICT_pagesize(dict) - (1+DICT_nodir(p))*sizeof(short))
+ DICT_bsize(p) - (1+DICT_nodir(p))*sizeof(short))
{
+ /* not enough room - split needed ... */
if (DICT_type(p) == 1)
{
clean_page (dict, ptr, p, NULL, 0, NULL);
return dict_ins (dict, str-1, ptr, userlen, userinfo);
}
else
- {
+ { /* enough room - no split needed ... */
info = (char*)p + DICT_size(p);
memcpy (info, &subptr, sizeof(subptr));
memcpy (info+sizeof(Dict_ptr), &dc, sizeof(Dict_char));
--indxp;
slen = (dict_strlen(str)+1)*sizeof(Dict_char);
if (DICT_size(p)+slen+userlen >=
- DICT_pagesize(dict) - (1+DICT_nodir(p))*sizeof(short)) /* overflow? */
+ (int)(DICT_bsize(p) - (1+DICT_nodir(p))*sizeof(short)))/* overflow? */
{
+ if (DICT_type(p))
+ {
+ clean_page (dict, ptr, p, NULL, 0, NULL);
+ return dict_ins (dict, str, ptr, userlen, userinfo);
+ }
split_page (dict, ptr, p);
return dict_ins (dict, str, ptr, userlen, userinfo);
}
{
short *indxp1;
(DICT_nodir(p))++;
- indxp1 = (short*)((char*) p + DICT_pagesize(dict)
+ indxp1 = (short*)((char*) p + DICT_bsize(p)
- DICT_nodir(p)*sizeof(short));
for (; indxp1 != indxp; indxp1++)
indxp1[0] = indxp1[1];
return 1;
}
-int dict_insert (Dict dict, const Dict_char *str, int userlen, void *userinfo)
+int dict_insert (Dict dict, const char *str, int userlen, void *userinfo)
{
- assert (dict->head.last > 0);
- if (dict->head.last == 1)
- return dict_ins (dict, str, 0, userlen, userinfo);
- else
- return dict_ins (dict, str, 1, userlen, userinfo);
+ if (!dict->head.root)
+ {
+ void *p;
+ if (dict->rw)
+ dict->head.root = new_page (dict, 0, &p);
+ if (!dict->head.root)
+ return 0;
+ }
+ return dict_ins (dict, (const Dict_char *) str, dict->head.root,
+ userlen, userinfo);
}