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/* avlstuff.c
Copyright 1996-2006 Han The Thanh <thanh@pdftex.org>
Copyright 2006-2008 Taco Hoekwater <taco@luatex.org>
This file is part of LuaTeX.
LuaTeX is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
LuaTeX is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU General Public License along
with LuaTeX; if not, see <http://www.gnu.org/licenses/>. */
#include "ptexlib.h"
#include <kpathsea/c-vararg.h>
#include <kpathsea/c-proto.h>
#include "avl.h"
static const char __svn_version[] =
"$Id: avlstuff.c 2271 2009-04-12 23:42:21Z oneiros $ $URL: http://scm.foundry.supelec.fr/svn/luatex/trunk/source/texk/web2c/luatexdir/utils/avlstuff.c $";
static struct avl_table **PdfObjTree = NULL;
/**********************************************************************/
/* memory management functions for AVL */
void *avl_xmalloc(struct libavl_allocator *allocator, size_t size)
{
assert(allocator != NULL && size > 0);
return xmalloc(size);
}
void avl_xfree(struct libavl_allocator *allocator, void *block)
{
assert(allocator != NULL && block != NULL);
xfree(block);
}
struct libavl_allocator avl_xallocator = {
avl_xmalloc,
avl_xfree
};
/**********************************************************************/
/* general AVL comparison functions */
int comp_int_entry(const void *pa, const void *pb, void *p)
{
cmp_return(*(const int *) pa, *(const int *) pb);
return 0;
}
int comp_string_entry(const void *pa, const void *pb, void *p)
{
return strcmp((const char *) pa, (const char *) pb);
}
/**********************************************************************/
/* One AVL tree for each obj_type 0...pdf_objtype_max */
typedef struct oentry_ {
integer int0;
integer objptr;
} oentry;
/* AVL sort oentry into avl_table[] */
int compare_info(const void *pa, const void *pb, void *param)
{
integer a, b;
int as, ae, bs, be, al, bl;
a = ((const oentry *) pa)->int0;
b = ((const oentry *) pb)->int0;
if (a < 0 && b < 0) { /* string comparison */
if (a <= 2097152 && b <= 2097152) {
a += 2097152;
b += 2097152;
as = str_start[-a];
ae = str_start[-a + 1]; /* start of next string in pool */
bs = str_start[-b];
be = str_start[-b + 1];
al = ae - as;
bl = be - bs;
if (al < bl) /* compare first by string length */
return -1;
if (al > bl)
return 1;
for (; as < ae; as++, bs++) {
if (str_pool[as] < str_pool[bs])
return -1;
if (str_pool[as] > str_pool[bs])
return 1;
}
} else {
pdftex_fail
("avlstuff.c: compare_items() for single characters: NI");
}
} else { /* integer comparison */
if (a < b)
return -1;
if (a > b)
return 1;
}
return 0;
}
void avl_put_obj(integer objptr, integer t)
{
static void **pp;
static oentry *oe;
int i;
if (PdfObjTree == NULL) {
PdfObjTree = xtalloc(pdf_objtype_max + 1, struct avl_table *);
for (i = 0; i <= pdf_objtype_max; i++)
PdfObjTree[i] = NULL;
}
if (PdfObjTree[t] == NULL) {
PdfObjTree[t] = avl_create(compare_info, NULL, &avl_xallocator);
if (PdfObjTree[t] == NULL)
pdftex_fail("avlstuff.c: avl_create() PdfObjTree failed");
}
oe = xtalloc(1, oentry);
oe->int0 = obj_tab[objptr].int0;
oe->objptr = objptr; /* allows to relocate objtab */
pp = avl_probe(PdfObjTree[t], oe);
if (pp == NULL)
pdftex_fail("avlstuff.c: avl_probe() out of memory in insertion");
}
/* replacement for linear search pascal function "find_obj()" */
integer avl_find_obj(integer t, integer i, integer byname)
{
static oentry *p;
static oentry tmp;
if (byname > 0)
tmp.int0 = -i;
else
tmp.int0 = i;
if (PdfObjTree == NULL || PdfObjTree[t] == NULL)
return 0;
p = (oentry *) avl_find(PdfObjTree[t], &tmp);
if (p == NULL)
return 0;
return p->objptr;
}
/**********************************************************************/
struct avl_table *mf_tree = NULL;
typedef struct {
char *tfm_name;
internalfontnumber fontnum;
} mf_entry;
/**********************************************************************/
/* cleaning up... */
static void destroy_oentry(void *pa, void *pb)
{
oentry *p = (oentry *) pa;
xfree(p);
}
void PdfObjTree_free()
{
int i;
if (PdfObjTree == NULL)
return;
for (i = 0; i <= pdf_objtype_max; i++) {
if (PdfObjTree[i] != NULL)
avl_destroy(PdfObjTree[i], destroy_oentry);
}
xfree(PdfObjTree);
PdfObjTree = NULL;
}
/**********************************************************************/
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