Revert "Remove deprecated code segments (#5891)"

This reverts commit 599e13e95e81aadb959c9f3715aec9b425ede084.

1 files changed, 59 insertions, 11 deletions

diff --git a/src/mapnode.cpp b/src/mapnode.cpp
index cae3d0b14..d835daba2 100644
--- a/src/mapnode.cpp
+++ b/src/mapnode.cpp
@@ -22,6 +22,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "porting.h"
 #include "nodedef.h"
 #include "map.h"
+#include "content_mapnode.h" // For mapnode_translate_*_internal
 #include "serialization.h" // For ser_ver_supported
 #include "util/serialize.h"
 #include "log.h"
@@ -630,19 +631,25 @@ void MapNode::serialize(u8 *dest, u8 version)
 }
 void MapNode::deSerialize(u8 *source, u8 version)
 {
-	if (!ser_ver_supported(version))
+	if(!ser_ver_supported(version))
 		throw VersionMismatchException("ERROR: MapNode format not supported");
 
-	if (version >= 24) {
-		param0 = readU16(source + 0);
-		param1 = readU8(source + 2);
-		param2 = readU8(source + 3);
-	} else {
-		param0 = readU8(source + 0);
-		param1 = readU8(source + 1);
-		param2 = readU8(source + 2);
-		if (param0 > 0x7F) {
-			param0 |= ((param2 & 0xF0) << 4);
+	if(version <= 21)
+	{
+		deSerialize_pre22(source, version);
+		return;
+	}
+
+	if(version >= 24){
+		param0 = readU16(source+0);
+		param1 = readU8(source+2);
+		param2 = readU8(source+3);
+	}else{
+		param0 = readU8(source+0);
+		param1 = readU8(source+1);
+		param2 = readU8(source+2);
+		if(param0 > 0x7F){
+			param0 |= ((param2&0xF0)<<4);
 			param2 &= 0x0F;
 		}
 	}
@@ -764,3 +771,44 @@ void MapNode::deSerializeBulk(std::istream &is, int version,
 	}
 }
 
+/*
+	Legacy serialization
+*/
+void MapNode::deSerialize_pre22(u8 *source, u8 version)
+{
+	if(version <= 1)
+	{
+		param0 = source[0];
+	}
+	else if(version <= 9)
+	{
+		param0 = source[0];
+		param1 = source[1];
+	}
+	else
+	{
+		param0 = source[0];
+		param1 = source[1];
+		param2 = source[2];
+		if(param0 > 0x7f){
+			param0 <<= 4;
+			param0 |= (param2&0xf0)>>4;
+			param2 &= 0x0f;
+		}
+	}
+
+	// Convert special values from old version to new
+	if(version <= 19)
+	{
+		// In these versions, CONTENT_IGNORE and CONTENT_AIR
+		// are 255 and 254
+		// Version 19 is fucked up with sometimes the old values and sometimes not
+		if(param0 == 255)
+			param0 = CONTENT_IGNORE;
+		else if(param0 == 254)
+			param0 = CONTENT_AIR;
+	}
+
+	// Translate to our known version
+	*this = mapnode_translate_to_internal(*this, version);
+}