From cde65190597c1b26b78f6b6f486dd0dc6d27ce1f Mon Sep 17 00:00:00 2001
From: NishiOwO <nishi@nishi.boats>
Date: Thu, 29 Jan 2026 17:49:16 +0900
Subject: [PATCH] oops

---
 engine/src/net/net_state.c | 92 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 engine/src/net/net_state.c

diff --git a/engine/src/net/net_state.c b/engine/src/net/net_state.c
new file mode 100644
index 0000000..23b129f
--- /dev/null
+++ b/engine/src/net/net_state.c
@@ -0,0 +1,92 @@
+#include <GearSrc/Net.h>
+
+#include <GearSrc/Endian.h>
+#include <GearSrc/Log.h>
+
+#include <stb_ds.h>
+
+enum states {
+	Acknowledged = 0,
+	WaitingAcknowledge
+};
+
+void GSNetStateRead(GSNetState* state, int fd, GSNetPacket* packet, GSNetAddress* address){
+	if(packet->header.flag & GSNetPacketFlagAcknowledge) {
+		if(arrlen(state->tx) > 0 && state->txstate == WaitingAcknowledge && state->txindex == packet->header.index && state->txseq == packet->header.seq) {
+			GSLog(state->engine, GSLogDebug, "Received ACK packet %d:%d", state->txindex, state->txseq);
+
+			state->txstate = Acknowledged;
+			state->txseq++;
+			if(state->txseq == (state->txtotal + 1)){
+				state->txseq = 0;
+				state->txindex++;
+
+				arrdel(state->tx, 0);
+			}
+		}
+	} else {
+		if(state->rxindex == packet->header.index && state->rxseq == packet->header.seq) {
+			GSNetPacket pkt;
+
+			GSLog(state->engine, GSLogDebug, "Received packet %d:%d", state->rxindex, state->rxseq);
+
+			pkt.header.flag |= GSNetPacketFlagAcknowledge;
+			pkt.header.index = state->rxindex;
+			pkt.header.seq	 = state->rxseq;
+			pkt.size	 = 0;
+
+			if(state->rxseq == 0){
+				state->rxtotal = GSEndianSwapU32BE(*(GSU32*)pkt.data);
+			}
+
+			GSNetPacketWrite(fd, &pkt, address);
+
+			state->rxseq++;
+			if(state->rxseq == (state->rxtotal + 1)){
+				state->rxseq = 0;
+				state->rxindex++;
+			}
+		}
+	}
+}
+
+void GSNetStateWrite(GSNetState* state, int fd, GSNetAddress* address){
+
+	if(arrlen(state->tx) > 0){
+		if(state->txstate == Acknowledged){
+			int n = state->tx[0].size;
+			GSNetPacket pkt;
+
+			if(state->txseq == 0){
+				GSU32 t;
+
+				state->txtotal = 0;
+
+				while(n > 0){
+					n -= 508 - sizeof(pkt.header);
+					state->txtotal++;
+				}
+
+				t = GSEndianSwapU32BE(state->txtotal);
+
+				pkt.header.flag = 0;
+				pkt.header.index = state->txindex;
+				pkt.header.seq = state->txseq;
+				memcpy(pkt.data, &t, 4);
+				pkt.size = 4;
+			}
+
+			GSNetPacketWrite(fd, &pkt, address);
+
+			state->txstate = WaitingAcknowledge;
+			if(state->engine->param->get_tick != NULL) state->txtick = state->engine->param->get_tick();
+
+			GSLog(state->engine, GSLogDebug, "Sent packet %d:%d", state->txindex, state->txseq);
+		}else if(state->engine->param->get_tick == NULL){
+		}else if((state->engine->param->get_tick() - state->txtick) >= 500){
+			GSLog(state->engine, GSLogDebug, "Lost packet %d:%d", state->txindex, state->txseq);
+
+			state->txstate = Acknowledged;
+		}
+	}
+}