From 8ef6cb2427ee16a763103bd3f315f38e2f01cfe2 Mon Sep 17 00:00:00 2001
From: FOTMarut <diego@axx.it>
Date: Sat, 16 Feb 2019 17:32:45 +0100
Subject: [PATCH] Replaced magic numbers with defines in dlls/nodes*

- Changed some symbols to be platform-independent
- Now the CGraph_Retail::copyOverTo method doesn't automatically fall back to manual copy (instead of memcpy) on GRAPH_VERSION increments
---
 dlls/nodes.cpp      | 18 +++++++++---------
 dlls/nodes.h        |  4 +++-
 dlls/nodes_compat.h | 12 +++++++-----
 3 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/dlls/nodes.cpp b/dlls/nodes.cpp
index 5e5b6acf..e81f3252 100644
--- a/dlls/nodes.cpp
+++ b/dlls/nodes.cpp
@@ -2397,7 +2397,7 @@ int CGraph::FLoadGraph( const char *szMapName )
 	iVersion = *(int *) pMemFile;
 	pMemFile += sizeof(int);
 
-	if( iVersion == GRAPH_VERSION || iVersion == 16 )
+	if( iVersion == GRAPH_VERSION || iVersion == GRAPH_VERSION_RETAIL )
 	{
 		// Read the graph class
 		//
@@ -2417,15 +2417,15 @@ int CGraph::FLoadGraph( const char *szMapName )
 			m_pRouteInfo = NULL;
 			m_pHashLinks = NULL;
 		}
-#if _GRAPH_VERSION != 16
+#if _GRAPH_VERSION != _GRAPH_VERSION_RETAIL
 		else
 		{
 			ALERT( at_aiconsole, "Loading CGraph in GRAPH_VERSION 16 compatibility mode\n" );
-			length -= sizeof(CGraph_32);
+			length -= sizeof(CGraph_Retail);
 			if( length < 0 )
 				goto ShortFile;
-			reinterpret_cast<CGraph_32*>(pMemFile) -> copyOverTo(this);
-			pMemFile += sizeof(CGraph_32);
+			reinterpret_cast<CGraph_Retail*>(pMemFile) -> copyOverTo(this);
+			pMemFile += sizeof(CGraph_Retail);
 		}
 #endif
 
@@ -2467,15 +2467,15 @@ int CGraph::FLoadGraph( const char *szMapName )
 			memcpy( m_pLinkPool, pMemFile, sizeof(CLink) * m_cLinks );
 			pMemFile += sizeof(CLink) * m_cLinks;
 		}
-#if _GRAPH_VERSION != 16
+#if _GRAPH_VERSION != _GRAPH_VERSION_RETAIL
 		else
 		{
 			ALERT( at_aiconsole, "Loading CLink array in GRAPH_VERSION 16 compatibility mode\n" );
-			length -= sizeof(CLink_32) * m_cLinks;
+			length -= sizeof(CLink_Retail) * m_cLinks;
 			if( length < 0 )
 				goto ShortFile;
-			reinterpret_cast<CLink_32*>(pMemFile) -> copyOverTo(m_pLinkPool);
-			pMemFile += sizeof(CLink_32) * m_cLinks;
+			reinterpret_cast<CLink_Retail*>(pMemFile) -> copyOverTo(m_pLinkPool);
+			pMemFile += sizeof(CLink_Retail) * m_cLinks;
 		}
 #endif
 
diff --git a/dlls/nodes.h b/dlls/nodes.h
index f43684c8..4bc1ec1b 100644
--- a/dlls/nodes.h
+++ b/dlls/nodes.h
@@ -105,12 +105,14 @@ typedef struct
 //=========================================================
 // CGraph 
 //=========================================================
+#define _GRAPH_VERSION_RETAIL 16 // Retail Half-Life graph version. Don't increment this
 #ifdef XASH_64BIT
 #define	_GRAPH_VERSION	(16 * 10)
 #else
-#define	_GRAPH_VERSION	(16)// !!!increment this whever graph/node/link classes change, to obsolesce older disk files.
+#define	_GRAPH_VERSION	(16) // !!!increment this whenever graph/node/link classes change, to obsolesce older disk files.
 #endif
 #define GRAPH_VERSION (int)_GRAPH_VERSION
+#define GRAPH_VERSION_RETAIL (int)_GRAPH_VERSION_RETAIL
 
 class CGraph
 {
diff --git a/dlls/nodes_compat.h b/dlls/nodes_compat.h
index da91a5b8..d73567e9 100644
--- a/dlls/nodes_compat.h
+++ b/dlls/nodes_compat.h
@@ -5,13 +5,13 @@
 
 //#include "nodes.h"
 
-#if _GRAPH_VERSION != 16
+#if _GRAPH_VERSION != _GRAPH_VERSION_RETAIL
 
 #include "stdint.h"
 
 typedef int32_t PTR32;
 
-class CGraph_32
+class CGraph_Retail
 {
 public:
 
@@ -62,10 +62,11 @@ public:
 		other->m_nRouteInfo	= m_nRouteInfo;
 
 		other->m_di = NULL;
-#if _GRAPH_VERSION == 160
+
 		memcpy( (void *) &other->m_RangeStart, (void *) m_RangeStart,
 				offsetof(class CGraph, m_pHashLinks) - offsetof(class CGraph, m_RangeStart) );
-#else	// fallback routine if the graph version changes
+
+#if 0	          // replacement routine in case a change in CGraph breaks the above memcpy
 		for (int i = 0; i < 3; ++i)
 			for (int j = 0; j < NUM_RANGES; ++j)
 				other->m_RangeStart[i][j] = m_RangeStart[i][j];
@@ -102,6 +103,7 @@ public:
 			other->m_HashPrimes[i]	= m_HashPrimes[i];
 //		m_HashPrimes[16]
 #endif
+
 		other->m_pHashLinks = NULL;
 		other->m_nHashLinks	= m_nHashLinks;
 
@@ -114,7 +116,7 @@ public:
 };
 
 
-class CLink_32
+class CLink_Retail
 {
 
 public: