From c4acc26076dffc9b02094541be1c29434a7c1f36 Mon Sep 17 00:00:00 2001
From: Arisotura <thetotalworm@gmail.com>
Date: Wed, 21 Sep 2022 18:53:49 +0200
Subject: [PATCH] fake enough of WEP processing to make Inazuma Eleven work

---
 src/NDS.cpp  | 25 ++++++++++++++++++-------
 src/Wifi.cpp | 22 +++++++++++++++++++++-
 2 files changed, 39 insertions(+), 8 deletions(-)

diff --git a/src/NDS.cpp b/src/NDS.cpp
index d0d16745..5262059c 100644
--- a/src/NDS.cpp
+++ b/src/NDS.cpp
@@ -1977,7 +1977,7 @@ void debug(u32 param)
     //    printf("VRAM %c: %02X\n", 'A'+i, GPU::VRAMCNT[i]);
 
     FILE*
-    shit = fopen("debug/tetrisDS.bin", "wb");
+    shit = fopen("debug/inazuma.bin", "wb");
     fwrite(ARM9->ITCM, 0x8000, 1, shit);
     for (u32 i = 0x02000000; i < 0x02400000; i+=4)
     {
@@ -1989,6 +1989,11 @@ void debug(u32 param)
         u32 val = ARM7Read32(i);
         fwrite(&val, 4, 1, shit);
     }
+    for (u32 i = 0x06000000; i < 0x06040000; i+=4)
+    {
+        u32 val = ARM7Read32(i);
+        fwrite(&val, 4, 1, shit);
+    }
     fclose(shit);
 
     /*FILE*
@@ -2974,7 +2979,8 @@ u8 ARM9IORead8(u32 addr)
         return (u8)(emuID[idx]);
     }
 
-    printf("unknown ARM9 IO read8 %08X %08X\n", addr, ARM9->R[15]);
+    if ((addr & 0xFFFFF000) != 0x04004000)
+        printf("unknown ARM9 IO read8 %08X %08X\n", addr, ARM9->R[15]);
     return 0;
 }
 
@@ -3120,7 +3126,8 @@ u16 ARM9IORead16(u32 addr)
         return GPU3D::Read16(addr);
     }
 
-    printf("unknown ARM9 IO read16 %08X %08X\n", addr, ARM9->R[15]);
+    if ((addr & 0xFFFFF000) != 0x04004000)
+        printf("unknown ARM9 IO read16 %08X %08X\n", addr, ARM9->R[15]);
     return 0;
 }
 
@@ -3263,7 +3270,8 @@ u32 ARM9IORead32(u32 addr)
         return GPU3D::Read32(addr);
     }
 
-    printf("unknown ARM9 IO read32 %08X %08X\n", addr, ARM9->R[15]);
+    if ((addr & 0xFFFFF000) != 0x04004000)
+        printf("unknown ARM9 IO read32 %08X %08X\n", addr, ARM9->R[15]);
     return 0;
 }
 
@@ -3799,7 +3807,8 @@ u8 ARM7IORead8(u32 addr)
         return SPU::Read8(addr);
     }
 
-    printf("unknown ARM7 IO read8 %08X %08X\n", addr, ARM7->R[15]);
+    if ((addr & 0xFFFFF000) != 0x04004000)
+        printf("unknown ARM7 IO read8 %08X %08X\n", addr, ARM7->R[15]);
     return 0;
 }
 
@@ -3892,7 +3901,8 @@ u16 ARM7IORead16(u32 addr)
         return SPU::Read16(addr);
     }
 
-    printf("unknown ARM7 IO read16 %08X %08X\n", addr, ARM7->R[15]);
+    if ((addr & 0xFFFFF000) != 0x04004000)
+        printf("unknown ARM7 IO read16 %08X %08X\n", addr, ARM7->R[15]);
     return 0;
 }
 
@@ -3992,7 +4002,8 @@ u32 ARM7IORead32(u32 addr)
         return SPU::Read32(addr);
     }
 
-    printf("unknown ARM7 IO read32 %08X %08X\n", addr, ARM7->R[15]);
+    if ((addr & 0xFFFFF000) != 0x04004000)
+        printf("unknown ARM7 IO read32 %08X %08X\n", addr, ARM7->R[15]);
     return 0;
 }
 
diff --git a/src/Wifi.cpp b/src/Wifi.cpp
index 841fb969..c2614e73 100644
--- a/src/Wifi.cpp
+++ b/src/Wifi.cpp
@@ -839,6 +839,21 @@ bool ProcessTX(TXSlot* slot, int num)
             slot->CurPhase = 1;
             slot->CurPhaseTime = len;
 
+            u16 framectl = *(u16*)&RAM[slot->Addr + 0xC];
+            if (framectl & (1<<14))
+            {
+                // WEP frame
+                // TODO: what happens when sending a WEP frame while WEP processing is off?
+                // TODO: some form of actual WEP processing?
+                // for now we just set the WEP FCS to a nonzero value, because some games require it
+
+                if (IOPORT(W_WEPCnt) & (1<<15))
+                {
+                    u32 wep_fcs = (slot->Addr + 0xC + slot->Length - 7) & ~0x1;
+                    *(u32*)&RAM[wep_fcs] = 0x22334466;
+                }
+            }
+
             u64 oldts;
             if (num == 4)
             {
@@ -891,7 +906,6 @@ bool ProcessTX(TXSlot* slot, int num)
             // any packet sent via CMD/REPLY/BEACON isn't going to have much use outside of local MP
             if (num == 0 || num == 2 || num == 3)
             {
-                u16 framectl = *(u16*)&RAM[slot->Addr + 0xC];
                 if ((framectl & 0x00FF) == 0x0010)
                 {
                     u16 aid = *(u16*)&RAM[slot->Addr + 0xC + 24 + 4];
@@ -1401,7 +1415,10 @@ void MPClientReplyRX(int client)
     // TODO: what are the maximum crop values?
     u16 framectl = *(u16*)&reply[12];
     if (framectl & (1<<14))
+    {
         framelen -= (IOPORT(W_RXLenCrop) >> 7) & 0x1FE;
+        if (framelen > 24) memmove(&RXBuffer[12+24], &RXBuffer[12+28], framelen);
+    }
     else
         framelen -= (IOPORT(W_RXLenCrop) << 1) & 0x1FE;
 
@@ -1470,7 +1487,10 @@ bool CheckRX(int type) // 0=regular 1=MP replies 2=MP host frames
 
         // TODO: what are the maximum crop values?
         if (framectl & (1<<14))
+        {
             framelen -= (IOPORT(W_RXLenCrop) >> 7) & 0x1FE;
+            if (framelen > 24) memmove(&RXBuffer[12+24], &RXBuffer[12+28], framelen);
+        }
         else
             framelen -= (IOPORT(W_RXLenCrop) << 1) & 0x1FE;