From 6fc0176aacacc9eefa215b8a6a1121cd6721f2c8 Mon Sep 17 00:00:00 2001
From: Bertrand Augereau
Date: Mon, 22 Aug 2011 14:46:06 +0200
Subject: DREAMWEB: 'checkiffree' ported to C++

---
 engines/dreamweb/dreamgen.cpp | 36 ------------------------------------
 engines/dreamweb/dreamgen.h   |  3 +--
 engines/dreamweb/stubs.cpp    | 26 ++++++++++++++++++++++++++
 engines/dreamweb/stubs.h      |  2 ++
 4 files changed, 29 insertions(+), 38 deletions(-)

(limited to 'engines')

diff --git a/engines/dreamweb/dreamgen.cpp b/engines/dreamweb/dreamgen.cpp
index ceec7d9049..de15b77520 100644
--- a/engines/dreamweb/dreamgen.cpp
+++ b/engines/dreamweb/dreamgen.cpp
@@ -15461,41 +15461,6 @@ notanexid:
 		goto identifyex;
 }
 
-void DreamGenContext::checkiffree() {
-	STACK_CHECK;
-	es = data.word(kBuffers);
-	bx = (0+(228*13)+32+60+(32*32)+(11*10*3)+768+768+768+(32*32)+(128*5))+(79*5);
-	cx = 79;
-identifyfree:
-	_cmp(es.byte(bx+4), 255);
-	if (flags.z())
-		goto notafreeid;
-	_cmp(al, es.byte(bx));
-	if (flags.c())
-		goto notafreeid;
-	_cmp(al, es.byte(bx+2));
-	if (!flags.c())
-		goto notafreeid;
-	_cmp(ah, es.byte(bx+1));
-	if (flags.c())
-		goto notafreeid;
-	_cmp(ah, es.byte(bx+3));
-	if (!flags.c())
-		goto notafreeid;
-	al = es.byte(bx+4);
-	ah = 2;
-	obname();
-	al = 0;
-	_cmp(al, 1);
-	return;
-notafreeid:
-	_sub(bx, 5);
-	_dec(cx);
-	_cmp(cx, -1);
-	if (!flags.z())
-		goto identifyfree;
-}
-
 void DreamGenContext::isitdescribed() {
 	STACK_CHECK;
 	push(ax);
@@ -18659,7 +18624,6 @@ void DreamGenContext::__dispatch_call(uint16 addr) {
 		case addr_identifyob: identifyob(); break;
 		case addr_checkifset: checkifset(); break;
 		case addr_checkifex: checkifex(); break;
-		case addr_checkiffree: checkiffree(); break;
 		case addr_isitdescribed: isitdescribed(); break;
 		case addr_findpathofpoint: findpathofpoint(); break;
 		case addr_findfirstpath: findfirstpath(); break;
diff --git a/engines/dreamweb/dreamgen.h b/engines/dreamweb/dreamgen.h
index 62aaf70661..df6c4cf736 100644
--- a/engines/dreamweb/dreamgen.h
+++ b/engines/dreamweb/dreamgen.h
@@ -133,7 +133,6 @@ public:
 	static const uint16 addr_findfirstpath = 0xc9f0;
 	static const uint16 addr_findpathofpoint = 0xc9ec;
 	static const uint16 addr_isitdescribed = 0xc9e8;
-	static const uint16 addr_checkiffree = 0xc9e4;
 	static const uint16 addr_checkifex = 0xc9e0;
 	static const uint16 addr_checkifset = 0xc9dc;
 	static const uint16 addr_identifyob = 0xc9d4;
@@ -2055,7 +2054,7 @@ public:
 	void useobject();
 	void mainman();
 	void volumeadjust();
-	void checkiffree();
+	//void checkiffree();
 };
 }
 
diff --git a/engines/dreamweb/stubs.cpp b/engines/dreamweb/stubs.cpp
index 1439a24de0..e77b18832b 100644
--- a/engines/dreamweb/stubs.cpp
+++ b/engines/dreamweb/stubs.cpp
@@ -955,6 +955,32 @@ bool DreamGenContext::checkifperson(uint8 x, uint8 y) {
 	return false;
 }
 
+void DreamGenContext::checkiffree() {
+	flags._z = not checkiffree(al, ah);
+}
+
+bool DreamGenContext::checkiffree(uint8 x, uint8 y) {
+	const ObjPos *freeList = (const ObjPos *)segRef(data.word(kBuffers)).ptr(kFreelist, 80 * sizeof(ObjPos));
+	for (size_t i = 0; i < 80; ++i) {
+		const ObjPos *objPos = freeList + 79 - i;
+		if (objPos->index == 0xff)
+			continue;
+		if (x < objPos->xMin)
+			continue;
+		if (x >= objPos->xMax)
+			continue;
+		if (y < objPos->yMin)
+			continue;
+		if (y >= objPos->yMax)
+			continue;
+		al = objPos->index;
+		ah = 2;
+		obname();
+		return true;
+	}
+	return false;
+}
+
 const uint8 *DreamGenContext::findobname(uint8 type, uint8 index) {
 	if (type == 5) {
 		uint16 i = 64 * 2 * (index & 127);
diff --git a/engines/dreamweb/stubs.h b/engines/dreamweb/stubs.h
index 37b7befe6e..6b0ed594be 100644
--- a/engines/dreamweb/stubs.h
+++ b/engines/dreamweb/stubs.h
@@ -123,6 +123,8 @@
 	void doblocks();
 	void checkifperson();
 	bool checkifperson(uint8 x, uint8 y);
+	void checkiffree();
+	bool checkiffree(uint8 x, uint8 y);
 	const uint8 *findobname(uint8 type, uint8 index);
 	void copyname();
 	void copyname(uint8 type, uint8 index, uint8 *dst);
-- 
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