Fix Door Item Issues

launcher/src/client/available-feature-flags

@@ -75,4 +75,5 @@ TRUE Fix Pigmen Burning In The Sun
 TRUE Fix Carried Grass's Bottom Texture
 TRUE Hide Crosshair In Third-Person
 TRUE Fix Camera Legs
-TRUE Implement Crafting Remainders
+TRUE Implement Crafting Remainders
+TRUE Fix Door Duplication

libreborn/src/patch/instruction.cpp

@@ -1,6 +1,23 @@
 #include <libreborn/libreborn.h>
 #include "patch-internal.h"
 
+// Check Instruction
+bool is_branch_instruction(unsigned char opcode) {
+    // Remove Condition
+    opcode &= 0xf;
+    // Check
+    if (opcode == 0b1010) {
+        // B
+        return true;
+    } else if (opcode == 0b1011) {
+        // BL
+        return true;
+    } else {
+        // Not A Branch
+        return false;
+    }
+}
+
 // Extract Target Address From B(L) Instruction
 static void *extract_from_bl_instruction(unsigned char *from, const uint32_t instruction) {
     // Extract The Signed 24-Bit Immediate Value
@@ -19,7 +36,7 @@ void *extract_from_bl_instruction(unsigned char *from) {
 }
 
 // Generate A BL Instruction
-uint32_t generate_bl_instruction(void *from, void *to, const int use_b_instruction) {
+uint32_t generate_bl_instruction(void *from, void *to, const unsigned char opcode) {
     const uint32_t from_addr = uint32_t(from);
     const uint32_t to_addr = uint32_t(to);
 
@@ -27,11 +44,11 @@ uint32_t generate_bl_instruction(void *from, void *to, const int use_b_instructi
     const int32_t offset = int32_t((to_addr - from_addr - 8) >> 2); // Account For The 2-Bit Shift
 
     // Create the instruction
-    uint32_t instruction = use_b_instruction ? B_INSTRUCTION : BL_INSTRUCTION;
+    uint32_t instruction = opcode;
     instruction *= 0x1000000;
 
     // Set The Offset (Last 24 Bits)
-    instruction |= (offset & 0x00FFFFFF);
+    instruction |= (offset & 0x00ffffff);
 
     // Check
     if (to != extract_from_bl_instruction((unsigned char *) from, instruction)) {

libreborn/src/patch/patch-internal.h

@@ -23,4 +23,5 @@ __attribute__((visibility("internal"))) void increment_code_block();
 // BL Instruction Magic Number
 #define BL_INSTRUCTION 0xeb
 #define B_INSTRUCTION 0xea
-__attribute__((visibility("internal"))) uint32_t generate_bl_instruction(void *from, void *to, int use_b_instruction);
+__attribute__((visibility("internal"))) bool is_branch_instruction(unsigned char opcode);
+__attribute__((visibility("internal"))) uint32_t generate_bl_instruction(void *from, void *to, unsigned char opcode = BL_INSTRUCTION);

libreborn/src/patch/patch.cpp

@@ -15,7 +15,7 @@ static void _overwrite_call_internal(void *start, void *target, const bool use_b
     void *code_block = update_code_block(target);
 
     // Patch
-    uint32_t new_instruction = generate_bl_instruction(start, code_block, use_b_instruction);
+    uint32_t new_instruction = generate_bl_instruction(start, code_block, use_b_instruction ? B_INSTRUCTION : BL_INSTRUCTION);
     patch(start, (unsigned char *) &new_instruction);
 
     // Increment Code Block Position
@@ -55,15 +55,15 @@ static int _overwrite_calls_within_internal(void *from, void *to, void *target,
     int found = 0;
     for (uintptr_t i = (uintptr_t) from; i < (uintptr_t) to; i = i + 4) {
         unsigned char *addr = (unsigned char *) i;
-        const int use_b_instruction = addr[3] == B_INSTRUCTION;
+        const unsigned char opcode = addr[3];
         // Check If Instruction is B Or BL
-        if (addr[3] == BL_INSTRUCTION || use_b_instruction) {
+        if (is_branch_instruction(opcode)) {
-            uint32_t check_instruction = generate_bl_instruction(addr, target, use_b_instruction);
+            // Extract Instruction Target
-            unsigned char *check_instruction_array = (unsigned char *) &check_instruction;
+            const void *instruction_target = extract_from_bl_instruction(addr);
             // Check If Instruction Calls Target
-            if (addr[0] == check_instruction_array[0] && addr[1] == check_instruction_array[1] && addr[2] == check_instruction_array[2]) {
+            if (instruction_target == target) {
                 // Patch Instruction
-                uint32_t new_instruction = generate_bl_instruction(addr, replacement, use_b_instruction);
+                uint32_t new_instruction = generate_bl_instruction(addr, replacement, opcode);
                 patch(addr, (unsigned char *) &new_instruction);
                 found++;
             }
@@ -113,11 +113,11 @@ void overwrite_calls_within_manual(void *from /* inclusive */, void *to /* exclu
 }
 
 // Patch Instruction
-static void safe_mprotect(void *addr, size_t len, int prot) {
+static void safe_mprotect(void *addr, const size_t len, const int prot) {
     const long page_size = sysconf(_SC_PAGESIZE);
     const long diff = uintptr_t(addr) % page_size;
     void *aligned_addr = (void *) (((uintptr_t) addr) - diff);
-    size_t aligned_len = len + diff;
+    const size_t aligned_len = len + diff;
     const int ret = mprotect(aligned_addr, aligned_len, prot);
     if (ret == -1) {
         ERR("Unable To Set Permissions: %p: %s", addr, strerror(errno));

media-layer/core/src/media.cpp

@@ -380,7 +380,7 @@ void SDL_WM_SetCaption(const char *title, __attribute__((unused)) const char *ic
 #endif
 
     // Debug
-    glGetString_t glGetString = (glGetString_t) glfwGetProcAddress("glGetString");
+    const glGetString_t glGetString = (glGetString_t) glfwGetProcAddress("glGetString");
     DEBUG("Using %s", (*glGetString)(GL_VERSION));
 
     // Init OpenAL

mods/src/f3/f3.cpp

@@ -47,7 +47,7 @@ static int debug_background_padding = 1;
 static int line_height = 8;
 static void render_debug_line(Gui *gui, std::string &line, const int x, const int y) {
     // Draw Background
-    int width = gui->minecraft->font->width(line);
+    const int width = gui->minecraft->font->width(line);
     if (width == 0) {
         return;
     }

mods/src/misc/misc.cpp

@@ -776,6 +776,11 @@ static int CarriedTile_getTexture2_injection(CarriedTile_getTexture2_t original,
     return original(self, face, metadata);
 }
 
+// Fix Door Item Dropping
+static void DoorTile_neighborChanged_Tile_spawnResources_injection(DoorTile *self, Level *level, int x, int y, int z, int data2, __attribute__((unused)) float chance) {
+    self->spawnResources(level, x, y, z, data2, 1);
+}
+
 // Init
 template <typename... Args>
 static void nop(__attribute__((unused)) Args... args) {
@@ -1043,6 +1048,13 @@ void init_misc() {
         overwrite_calls(CarriedTile_getTexture2, CarriedTile_getTexture2_injection);
     }
 
+    // Fix Door Duplication
+    if (feature_has("Fix Door Duplication", server_enabled)) {
+        unsigned char nop_patch[4] = {0x00, 0xf0, 0x20, 0xe3}; // "nop"
+        patch((void *) 0xbe230, nop_patch);
+        overwrite_call((void *) 0xbe110, (void *) DoorTile_neighborChanged_Tile_spawnResources_injection);
+    }
+
     // Init Logging
     _init_misc_logging();
     _init_misc_api();

symbols/src/tile/Tile.def

@@ -54,6 +54,7 @@ virtual-method Tile *setSoundType(const Tile_SoundType &sound_type) = 0xe8;
 virtual-method Tile *setLightEmission(float light) = 0xf0;
 virtual-method Tile *setExplodeable(float explodeable) = 0xf4;
 virtual-method Tile *setDestroyTime(float destroy_time) = 0xf8;
+virtual-method void spawnResources(Level *level, int x, int y, int z, int data, float chance) = 0x80;
 
 property int texture = 0x4;
 property int id = 0x8;