From 1ed47ea0771690a96da71172c90920f1aadbaeba Mon Sep 17 00:00:00 2001
From: KubaPro010 <kuba.pro010@gmail.com>
Date: Sun, 28 Dec 2025 23:30:37 +0100
Subject: [PATCH] maybe my receiver is bugged? (rds spy)

---
 scripts/1-rft.lua |  5 ++---
 src/lib.c         | 12 +++++++-----
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/scripts/1-rft.lua b/scripts/1-rft.lua
index 82e46cf..fe8398e 100644
--- a/scripts/1-rft.lua
+++ b/scripts/1-rft.lua
@@ -5,7 +5,6 @@ _Rft_toggle = false
 _Rft_last_id = -1
 _Rft_version = 0
 _Rft_crc_mode = -1
-_Rft_crc_state = 0
 _Rft_crc_sent = false
 _Rft_aid = 0xFF7F
 
@@ -24,7 +23,7 @@ local function start_rft()
                 _Rft_crc_sent = true
                 if _Rft_crc_mode ~= 0 then warn("rft: No other crc than mode 0 is supported as of now") end
                 _Rft_crc_mode = 0
-                return true, (2 << 14), _Rft_aid, (1 << 12) | (_Rft_crc_mode & 7) << 9 | (seg & 511), crc16(_Rft_file)
+                return true, (2 << 14), _Rft_aid, (1 << 12) | (0 & 7) << 9 | (0 & 0x1ff), crc16(_Rft_file)
             else
                 _Rft_crc_sent = false
             end
@@ -59,7 +58,7 @@ function load_station_logo(path, id, crc)
 
     if id == _Rft_last_id then 
         _Rft_toggle = not _Rft_toggle
-        _Rft_crc_state = 0
+        _Rft_crc_sent = 0
         _Rft_version = _Rft_version + 1
         if _Rft_version > 7 then _Rft_version = 0 end
     end
diff --git a/src/lib.c b/src/lib.c
index fa1b2f5..5bfe5b5 100644
--- a/src/lib.c
+++ b/src/lib.c
@@ -26,15 +26,17 @@ inline int _strncpy(char *dest, const char *src, int n) {
 	return i;
 }
 uint16_t crc16_ccitt(const char* data, uint16_t len) {
-	uint16_t i, crc=0xFFFF;
-	for (i=0; i < len; i++ ) {
-		crc = (unsigned char)(crc >> 8) | (crc << 8);
+	uint16_t crc = 0xffff;
+
+	for (size_t i = 0; i < len; i++) {
+		crc = (crc >> 8) | (crc << 8);
 		crc ^= data[i];
-		crc ^= (unsigned char)(crc & 0xff) >> 4;
+		crc ^= (crc & 0xff) >> 4;
 		crc ^= (crc << 8) << 4;
 		crc ^= ((crc & 0xff) << 4) << 1;
 	}
-	return ((crc ^= 0xFFFF) & 0xFFFF);
+
+	return crc ^ 0xffff;
 }
 
 inline uint16_t get_block_from_group(RDSGroup *group, uint8_t block) {