From 562dcc336797951b2a8707413aa44177484c9f2a Mon Sep 17 00:00:00 2001
From: Thomas Grill <xovo@users.sourceforge.net>
Date: Sat, 28 Dec 2002 04:37:42 +0000
Subject:  ""

svn path=/trunk/; revision=309
---
 externals/grill/flext/source/flitem.cpp | 209 ++++++++++++++++++++++++++++++++
 1 file changed, 209 insertions(+)
 create mode 100755 externals/grill/flext/source/flitem.cpp

(limited to 'externals/grill/flext/source/flitem.cpp')

diff --git a/externals/grill/flext/source/flitem.cpp b/externals/grill/flext/source/flitem.cpp
new file mode 100755
index 00000000..cd5aed9e
--- /dev/null
+++ b/externals/grill/flext/source/flitem.cpp
@@ -0,0 +1,209 @@
+/* 
+
+flext - C++ layer for Max/MSP and pd (pure data) externals
+
+Copyright (c) 2001,2002 Thomas Grill (xovo@gmx.net)
+For information on usage and redistribution, and for a DISCLAIMER OF ALL
+WARRANTIES, see the file, "license.txt," in this distribution.  
+
+*/
+
+/*! \file flitem.cpp
+    \brief Processing of method and attribute lists.
+*/
+ 
+#include "flext.h"
+#include <string.h>
+
+
+flext_base::item::item(const t_symbol *t,int inl,attritem *a): 
+ inlet(inl),tag(t),attr(a),nxt(NULL) 
+{}
+
+flext_base::item::~item()
+{
+	if(nxt) delete nxt;
+}
+
+
+flext_base::itemarr::itemarr():
+	arr(new item *[2]),cnt(0),bits(-1)
+{
+	arr[0] = arr[1] = NULL;
+}
+
+flext_base::itemarr::~itemarr()
+{
+	int c = Ready()?Size():2;
+
+	for(int i = 0; i < c; ++i)
+		if(arr[i]) delete arr[i];
+	delete[] arr;
+}
+
+void flext_base::itemarr::Add(item *it)
+{
+	if(Ready()) {
+		// retrieve array index
+		int ix = Hash(it->tag,it->inlet,bits);
+
+		// add to array slot
+		if(arr[ix]) {
+			item *a = arr[ix];
+			while(a->nxt) a = a->nxt;
+			a->nxt = it;
+		}
+		else arr[ix] = it;
+	}
+	else {
+//		post("ADD %i,%s",it->inlet,GetString(it->tag));			
+
+		if(arr[0]) arr[1] = arr[1]->nxt = it;
+		else arr[0] = arr[1] = it;
+		++cnt;
+	}
+}
+
+void flext_base::itemarr::Finalize()
+{
+	if(!Ready()) 
+	{
+		bits = Int2Bits(cnt); // at least enough bits to hold all items
+		
+		int sz = Size();
+
+		// save stored item list
+		item *lst = arr[0];
+		
+		delete[] arr;
+		arr = new item *[sz];
+		memset(arr,0,sz*sizeof(*arr));
+		
+		while(lst) {
+			item *l = lst;
+			lst = lst->nxt;
+			l->nxt = NULL;
+
+			Add(l);
+/*
+			// retrieve array index
+			int ix = Hash(l->tag,l->inlet,bits);
+
+//			post("ADD %i,%s -> index %i",l->inlet,GetString(l->tag),ix);			
+
+			// add to array slot
+			if(arr[ix]) {
+				item *a = arr[ix];
+				while(a->nxt) a = a->nxt;
+				a->nxt = l;
+			}
+			else arr[ix] = l;
+*/
+		}
+
+#if 0
+		post("count=%i, bit=%i size=%i",Count(),bits,sz);
+
+		if(Count()) {
+			static char usage[1024];
+			int c = 0,i;
+			for(i = 0; i < sz; ++i) {
+				usage[i] = arr[i]?'x':'.'; 
+				if(arr[i]) ++c;
+			}
+			usage[i] = 0;
+			post("USAGE %i/%i - sparse=%i%% %s",c,Count(),(int)((float)c/Count()*100.),usage);
+		}
+#endif
+	}
+}
+
+flext_base::item *flext_base::itemarr::Find(const t_symbol *tag,int inlet) const
+{
+	item *a;
+	if(!Ready())
+		a = arr[0];
+	else if(Count()) {
+		int ix = Hash(tag,inlet,bits);
+		a = arr[ix];
+	}
+	else
+		a = NULL;
+
+	// Search first matching entry
+	while(a && (a->tag != tag || a->inlet != inlet)) a = a->nxt;
+	return a;
+}
+
+int flext_base::itemarr::Hash(const t_symbol *tag,int inlet,int bits)
+{
+	unsigned long h = ((reinterpret_cast<unsigned long>(tag)&~7L)<<1)+inlet;
+	return FoldBits(h,bits);
+}
+
+// --- class item lists (methods and attributes) ----------------
+
+class _itemarr 
+{
+public:
+	enum { HASHBITS=7, HASHSIZE=1<<HASHBITS };
+
+	_itemarr(t_class *c,int i);
+	~_itemarr(); // will never be called
+
+	static int Hash(t_class *c,int ix);
+
+	int Hash() const { return Hash(cl,ix); }
+	void Add(_itemarr *a);
+
+	t_class *cl;
+	int ix;
+	flext_base::itemarr *arr;
+
+	_itemarr *nxt;
+};
+
+_itemarr::_itemarr(t_class *c,int i):
+	cl(c),ix(i),
+	arr(new flext_base::itemarr),
+	nxt(NULL)
+{}
+
+void _itemarr::Add(_itemarr *a)
+{
+	if(nxt) nxt->Add(a);
+	else nxt = a;
+}
+
+int _itemarr::Hash(t_class *c,int ix) 
+{
+	unsigned long h = (reinterpret_cast<unsigned long>(c)&~3L)+ix;
+	return flext::FoldBits(h,HASHBITS);
+}
+
+static _itemarr **_arrs = NULL;
+
+flext_base::itemarr *flext_base::GetClassArr(t_class *c,int ix) 
+{
+	if(!_arrs) {
+		_arrs = new _itemarr *[_itemarr::HASHSIZE];
+		memset(_arrs,0,_itemarr::HASHSIZE*sizeof(*_arrs));
+	}
+
+	int hash = _itemarr::Hash(c,ix);
+	_itemarr *a = _arrs[hash];
+	_itemarr *pa = NULL;
+	while(a && (a->cl != c || a->ix != ix)) pa = a,a = a->nxt;
+
+	if(!a) {
+		a = new _itemarr(c,ix);
+		if(pa) 
+			// previous entry... extend
+			a->nxt = pa->nxt,pa->nxt = a;
+		else 
+			// new singular entry
+			_arrs[hash] = a;
+	}
+
+	return a->arr;
+}
-- 
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