From 172f8c8ac189e1f6590324eb0aca14cffdba3083 Mon Sep 17 00:00:00 2001
From: Andrei Karas <akaras@inbox.ru>
Date: Tue, 6 Nov 2018 04:15:56 +0300
Subject: Add compile time validation for packet ZC_ITEM_PREVIEW.

---
 src/common/packetsstatic_len.h | 33 +++++++++++++++++++++++++++++++
 src/map/HPMmap.c               |  1 -
 src/map/clif.c                 |  2 +-
 src/map/packets_struct.h       | 45 +++++++++++++++++++++++++++---------------
 4 files changed, 63 insertions(+), 18 deletions(-)
 create mode 100644 src/common/packetsstatic_len.h

diff --git a/src/common/packetsstatic_len.h b/src/common/packetsstatic_len.h
new file mode 100644
index 000000000..9ccc4a673
--- /dev/null
+++ b/src/common/packetsstatic_len.h
@@ -0,0 +1,33 @@
+/**
+ * This file is part of Hercules.
+ * http://herc.ws - http://github.com/HerculesWS/Hercules
+ *
+ * Copyright (C) 2013-2018  Hercules Dev Team
+ *
+ * Hercules 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef COMMON_PACKETSSTATIC_LEN_H
+#define COMMON_PACKETSSTATIC_LEN_H
+
+#ifdef packetLen
+#error packetLen already defined
+#endif
+
+#define packetLen(id, len) PACKET_LEN_##id = (len),
+enum packet_lengths {
+#include "common/packets_len.h"
+};
+#undef packetLen
+
+#endif /* COMMON_PACKETSSTATIC_LEN_H */
diff --git a/src/map/HPMmap.c b/src/map/HPMmap.c
index 8ea524d23..6eff37df8 100644
--- a/src/map/HPMmap.c
+++ b/src/map/HPMmap.c
@@ -74,7 +74,6 @@
 #include "map/mercenary.h"
 #include "map/mob.h"
 #include "map/npc.h"
-#include "map/packets_struct.h"
 #include "map/party.h"
 #include "map/path.h"
 #include "map/pc.h"
diff --git a/src/map/clif.c b/src/map/clif.c
index d4c378f27..9f1038d2c 100644
--- a/src/map/clif.c
+++ b/src/map/clif.c
@@ -21971,7 +21971,7 @@ static void clif_item_preview(struct map_session_data *sd, int n)
 	Assert_retv(n >= 0 && n < MAX_INVENTORY);
 
 	struct PACKET_ZC_ITEM_PREVIEW p;
-	p.packetType = itemPreview;
+	p.packetType = HEADER_ZC_ITEM_PREVIEW;
 	p.index = n + 2;
 #if PACKETVER_MAIN_NUM >= 20181017 || PACKETVER_RE_NUM >= 20181017 || PACKETVER_ZERO_NUM >= 20181024
 	p.isDamaged = (sd->status.inventory[n].attribute & ATTR_BROKEN) != 0 ? 1 : 0;
diff --git a/src/map/packets_struct.h b/src/map/packets_struct.h
index 5d097104e..cd3a3b989 100644
--- a/src/map/packets_struct.h
+++ b/src/map/packets_struct.h
@@ -25,10 +25,15 @@
 
 #include "common/cbasetypes.h"
 #include "common/mmo.h"
+#include "common/packetsstatic_len.h"
 
 // Packet DB
 #define MAX_PACKET_POS 20
 
+#define DEFINE_PACKET_HEADER(name, id) \
+	STATIC_ASSERT(sizeof(struct PACKET_##name) == PACKET_LEN_##id, "Wrong size PACKET_"#name); \
+	enum { HEADER_##name = id };
+
 /**
  *
  **/
@@ -449,11 +454,6 @@ enum packet_headers {
 #else
 	guildLeave = 0x15a,
 #endif
-#if PACKETVER_MAIN_NUM >= 20181017 || PACKETVER_RE_NUM >= 20181017 || PACKETVER_ZERO_NUM >= 20181024
-	itemPreview = 0xb13,
-#else
-	itemPreview = 0xab9,
-#endif
 #if PACKETVER_RE_NUM >= 20181031
 	autoSpellList = 0xafb,
 #else
@@ -2882,17 +2882,6 @@ struct PACKET_ZC_CAMERA_INFO {
 	float latitude;
 } __attribute__((packed));
 
-struct PACKET_ZC_ITEM_PREVIEW {
-	int16 packetType;
-	int16 index;
-#if PACKETVER_MAIN_NUM >= 20181017 || PACKETVER_RE_NUM >= 20181017 || PACKETVER_ZERO_NUM >= 20181024
-	int8 isDamaged;
-#endif
-	int16 refiningLevel;
-	struct EQUIPSLOTINFO slot;
-	struct ItemOptions option_data[MAX_ITEM_OPTIONS];
-} __attribute__((packed));
-
 #if PACKETVER_RE_NUM >= 20181031
 #define PACKET_ZC_AUTOSPELLLIST PACKET_ZC_AUTOSPELLLIST2
 #else
@@ -2910,6 +2899,30 @@ struct PACKET_ZC_AUTOSPELLLIST2 {
 	int skills[];
 } __attribute__((packed));
 
+#if PACKETVER_MAIN_NUM >= 20170726 || PACKETVER_RE_NUM >= 20170621 || defined(PACKETVER_ZERO)
+#if PACKETVER_MAIN_NUM >= 20181017 || PACKETVER_RE_NUM >= 20181017 || PACKETVER_ZERO_NUM >= 20181024
+struct PACKET_ZC_ITEM_PREVIEW {
+	int16 packetType;
+	int16 index;
+	int8 isDamaged;
+	int16 refiningLevel;
+	struct EQUIPSLOTINFO slot;
+	struct ItemOptions option_data[MAX_ITEM_OPTIONS];
+} __attribute__((packed));
+DEFINE_PACKET_HEADER(ZC_ITEM_PREVIEW, 0x0b13);
+#else  // PACKETVER_MAIN_NUM >= 20181017 || PACKETVER_RE_NUM >= 20181017 || PACKETVER_ZERO_NUM >= 20181024
+
+struct PACKET_ZC_ITEM_PREVIEW {
+	int16 packetType;
+	int16 index;
+	int16 refiningLevel;
+	struct EQUIPSLOTINFO slot;
+	struct ItemOptions option_data[MAX_ITEM_OPTIONS];
+} __attribute__((packed));
+DEFINE_PACKET_HEADER(ZC_ITEM_PREVIEW, 0x0ab9);
+#endif  // PACKETVER_MAIN_NUM >= 20181017 || PACKETVER_RE_NUM >= 20181017 || PACKETVER_ZERO_NUM >= 20181024
+#endif  // PACKETVER_MAIN_NUM >= 20170726 || PACKETVER_RE_NUM >= 20170621 || defined(PACKETVER_ZERO)
+
 #if !defined(sun) && (!defined(__NETBSD__) || __NetBSD_Version__ >= 600000000) // NetBSD 5 and Solaris don't like pragma pack but accept the packed attribute
 #pragma pack(pop)
 #endif // not NetBSD < 6 / Solaris
-- 
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