Splitting a few helper functions out of gob.h

svn-id: r40765

1 files changed, 106 insertions, 0 deletions

diff --git a/engines/gob/helper.h b/engines/gob/helper.h
new file mode 100644
index 0000000000..3e4e3387bc
--- /dev/null
+++ b/engines/gob/helper.h
@@ -0,0 +1,106 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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.
+
+ * This program 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 General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef GOB_HELPER_H
+#define GOB_HELPER_H
+
+namespace Gob {
+
+/** A strncpy that forces the final \0. */
+inline char *strncpy0(char *dest, const char *src, size_t n) {
+	strncpy(dest, src, n);
+	dest[n] = 0;
+	return dest;
+}
+
+/** A strdup that new[]s the buffer. */
+inline char *strdupcpy(const char *str) {
+	if (!str)
+		return 0;
+
+	size_t len = strlen(str) + 1;
+
+	char *nstr = new char[len];
+
+	memcpy(nstr, str, len);
+
+	return nstr;
+}
+
+/** A "smart" reference counting templated class. */
+template<typename T>
+class ReferenceCounter {
+public:
+	class Ptr {
+	public:
+		bool operator==(const Ptr &p) const { return _p == p._p; }
+		bool operator==(const ReferenceCounter *p) const { return _p == p; }
+
+		T *operator-> () { return _p; }
+		T &operator* () { return *_p; }
+		operator T*() { return _p; }
+
+		Ptr(T *p) : _p(p) { ++_p->_references; }
+		Ptr() : _p(0) { }
+
+		~Ptr() {
+			if (_p && (--_p->_references == 0))
+				delete _p;
+		}
+
+		Ptr(const Ptr &p) : _p(p._p) { ++_p->_references; }
+
+		Ptr &operator= (const Ptr &p) {
+			++p._p->_references;
+			if (_p && (--_p->_references == 0))
+				delete _p;
+			_p = p._p;
+			return *this;
+		}
+		Ptr *operator= (const Ptr *p) {
+			if (p)
+				++p->_p->_references;
+			if (_p && (--_p->_references == 0))
+				delete _p;
+
+			_p = p ? p->_p : 0;
+			return this;
+		}
+
+	private:
+		T *_p;
+	};
+
+	ReferenceCounter() : _references(0) { }
+	virtual ~ReferenceCounter() {}
+
+private:
+	unsigned _references;
+	friend class Ptr;
+};
+
+} // End of namespace Gob
+
+#endif // GOB_HELPER_H