Adjust max VMEM packet size for CRC and RDP header length

Author: troelsjessen

src/vmem/vmem_server.c

@@ -90,6 +90,7 @@ void vmem_server_handler(csp_conn_t * conn)
 		uint64_t length;
 		uint64_t address;
 		uint16_t mtu = VMEM_SERVER_MTU;
+		const uint16_t mtu_max = CSP_BUFFER_SIZE - sizeof(csp_crc32_t) - 5; /* 5 bytes for RDP header */
 
 		if (request->version == 3) {
 			address = be64toh(request->data3.address);
@@ -108,6 +109,10 @@ void vmem_server_handler(csp_conn_t * conn)
 			length = be32toh(request->data.length);
 		}
 
+		if (mtu > mtu_max) {
+			mtu = mtu_max;
+		}
+
 		//printf("Download from:");
 		//printf("  Addr %"PRIx64"\n", address);
 		//printf("  Length %"PRIu32"\n", length);