From ee69d3ab9be6875d61ab03823bf73d172bd96452 Mon Sep 17 00:00:00 2001
From: p2r3 <p2r3@p2r3.com>
Date: Sat, 23 Aug 2025 04:24:06 +0300
Subject: [PATCH] support placing blocks on containers while sneaking

---
 include/globals.h |  1 +
 include/packets.h |  1 +
 src/main.c        |  4 ++++
 src/packets.c     | 38 ++++++++++++++++++++++++++++----------
 4 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/include/globals.h b/include/globals.h
index e655916..27cd61b 100644
--- a/include/globals.h
+++ b/include/globals.h
@@ -95,6 +95,7 @@ typedef struct {
   uint8_t craft_count[9];
   // 0x01 - attack cooldown
   // 0x02 - has not spawned yet
+  // 0x04 - sneaking
   uint8_t flags;
 } PlayerData;
 
diff --git a/include/packets.h b/include/packets.h
index 85177af..c2968d8 100644
--- a/include/packets.h
+++ b/include/packets.h
@@ -49,6 +49,7 @@ int sc_systemChat (int client_fd, char* message, uint16_t len);
 int cs_interact (int client_fd);
 int sc_entityEvent (int client_fd, int entity_id, uint8_t status);
 int sc_removeEntity (int client_fd, int entity_id);
+int cs_playerInput (int client_fd);
 int sc_registries (int client_fd);
 
 #endif
diff --git a/src/main.c b/src/main.c
index e174e5a..b036548 100644
--- a/src/main.c
+++ b/src/main.c
@@ -335,6 +335,10 @@ void handlePacket (int client_fd, int length, int packet_id) {
       }
       break;
 
+    case 0x2A:
+      if (state == STATE_PLAY) cs_playerInput(client_fd);
+      break;
+
     case 0x34:
       if (state == STATE_PLAY) cs_setHeldItem(client_fd);
       break;
diff --git a/src/packets.c b/src/packets.c
index e74c7e6..f3d75d8 100644
--- a/src/packets.c
+++ b/src/packets.c
@@ -490,13 +490,19 @@ int cs_useItemOn (int client_fd) {
   int sequence = readVarInt(client_fd);
   sc_acknowledgeBlockChange(client_fd, sequence);
 
-  uint8_t target = getBlockAt(x, y, z);
-  if (target == B_crafting_table) {
-    sc_openScreen(client_fd, 12, "Crafting", 8);
-    return 0;
-  } else if (target == B_furnace) {
-    sc_openScreen(client_fd, 14, "Furnace", 7);
-    return 0;
+  PlayerData *player;
+  if (getPlayerData(client_fd, &player)) return 1;
+
+  // Check interaction with containers when not sneaking
+  if (!(player->flags & 0x04)) {
+    uint8_t target = getBlockAt(x, y, z);
+    if (target == B_crafting_table) {
+      sc_openScreen(client_fd, 12, "Crafting", 8);
+      return 0;
+    } else if (target == B_furnace) {
+      sc_openScreen(client_fd, 14, "Furnace", 7);
+      return 0;
+    }
   }
 
   switch (face) {
@@ -509,9 +515,6 @@ int cs_useItemOn (int client_fd) {
     default: break;
   }
 
-  PlayerData *player;
-  if (getPlayerData(client_fd, &player)) return 1;
-
   uint16_t *item = &player->inventory_items[player->hotbar];
   uint8_t *count = &player->inventory_count[player->hotbar];
   uint8_t block = I_to_B(*item);
@@ -1028,6 +1031,21 @@ int sc_removeEntity (int client_fd, int entity_id) {
   return 0;
 }
 
+// C->S Player Input
+int cs_playerInput (int client_fd) {
+
+  uint8_t flags = readByte(client_fd);
+
+  PlayerData *player;
+  if (getPlayerData(client_fd, &player)) return 1;
+
+  // Set or clear sneaking flag
+  if (flags & 0x20) player->flags |= 0x04;
+  else player->flags &= ~0x04;
+
+  return 0;
+}
+
 // S->C Registry Data (multiple packets) and Update Tags (configuration, multiple packets)
 int sc_registries (int client_fd) {