From c3ae1269e43ff0774be8d61f81b1af9a8b8d8f8e Mon Sep 17 00:00:00 2001
From: Arti Zirk <arti.zirk@gmail.com>
Date: Sun, 1 Nov 2026 11:08:55 +0200
Subject: [PATCH] fix(badapple): distinguish UDP load failures and repeat the
 send

---
 bad-apple/player/main.c       | 15 ++++++++++++---
 bad-apple/tools/send_movie.py | 34 +++++++++++++++++++---------------
 2 files changed, 31 insertions(+), 18 deletions(-)

diff --git a/bad-apple/player/main.c b/bad-apple/player/main.c
index e0934cf..f14568e 100644
--- a/bad-apple/player/main.c
+++ b/bad-apple/player/main.c
@@ -79,6 +79,7 @@ static unsigned char rxbuf[1600];
 static unsigned char sa[16];
 static unsigned char from[16];
 static int fromlen;
+static unsigned int rx_error;
 
 /* Receive movie.bin over the OS UDP stack into a malloc'd bit buffer.
  * Packet: u32 offset, u16 length, u16 seq, u16 crc16, then bytes.
@@ -97,15 +98,18 @@ unsigned int expected;
 
     ptr = malloc_(expected);
     if (ptr == 0) {
+        rx_error = 3;
         return 0;
     }
     fd = socket_(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
     if (fd < 0) {
+        rx_error = 4;
         return 0;
     }
     sa_any(sa, NET_PORT);
     if (bind_(fd, sa, SOCKADDR_LEN) < 0) {
         close_(fd);
+        rx_error = 5;
         return 0;
     }
     sent_sum = 0;
@@ -126,7 +130,11 @@ unsigned int expected;
                 | ((unsigned int)rxbuf[11] << 8)
                 | ((unsigned int)rxbuf[12] << 16)
                 | ((unsigned int)rxbuf[13] << 24);
-            break;
+            if (movie_checksum(dst, expected) == sent_sum) {
+                break;
+            }
+            sent_sum = 0;
+            continue;
         }
         if (length > (unsigned int)(n - 10)) {
             continue;
@@ -139,7 +147,8 @@ unsigned int expected;
         }
     }
     close_(fd);
-    if (movie_checksum(dst, expected) != sent_sum) {
+    if (sent_sum == 0) {
+        rx_error = 6;
         return 0;
     }
     return ptr;
@@ -206,7 +215,7 @@ int main()
         *(unsigned int *)(MARK + 0x10 * 8) = 0x20;
         movie_base = receive_movie(movie_len);
         if (movie_base == 0) {
-            show_fault(0xBAD00003);
+            show_fault(0xBAD00000 | rx_error);
         }
         vid_dint_();
     } else {
diff --git a/bad-apple/tools/send_movie.py b/bad-apple/tools/send_movie.py
index 2cf35e0..25042ef 100644
--- a/bad-apple/tools/send_movie.py
+++ b/bad-apple/tools/send_movie.py
@@ -34,25 +34,27 @@ def parse_ack(data: bytes) -> int:
 
 
 def send_movie(host: str, port: int, path: str, chunk: int = 1450,
-               delay: float = 0.0005) -> int:
+               delay: float = 0.0005, passes: int = 3) -> int:
     data = Path(path).read_bytes()
     sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
     try:
-        offset = 0
-        seq = 0
-        while offset < len(data):
-            part = data[offset:offset + chunk]
-            sock.sendto(pack_packet(offset, seq, part), (host, port))
-            offset += len(part)
-            seq += 1
-            if delay:
-                time.sleep(delay)
-        sock.sendto(pack_packet(len(data), seq,
-                                checksum32(data).to_bytes(4, "little")),
-                    (host, port))
+        for _ in range(passes):
+            offset = 0
+            seq = 0
+            while offset < len(data):
+                part = data[offset:offset + chunk]
+                sock.sendto(pack_packet(offset, seq, part), (host, port))
+                offset += len(part)
+                seq += 1
+                if delay:
+                    time.sleep(delay)
+            sock.sendto(pack_packet(len(data), seq,
+                                    checksum32(data).to_bytes(4, "little")),
+                        (host, port))
+            time.sleep(0.05)
     finally:
         sock.close()
-    print("sent %d bytes in %d packets" % (len(data), seq + 1))
+    print("sent %d bytes in %d pass(es)" % (len(data), passes))
     return 0
 
 
@@ -63,8 +65,10 @@ def main(argv=None) -> int:
     parser.add_argument("--movie", required=True)
     parser.add_argument("--chunk", type=int, default=1450)
     parser.add_argument("--delay", type=float, default=0.0005)
+    parser.add_argument("--passes", type=int, default=3)
     args = parser.parse_args(argv)
-    return send_movie(args.host, args.port, args.movie, args.chunk, args.delay)
+    return send_movie(args.host, args.port, args.movie, args.chunk,
+                      args.delay, args.passes)
 
 
 if __name__ == "__main__":