crc?

src/common.h

@@ -4,9 +4,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#ifndef _WIN32
 #include <unistd.h>
-#endif
 #include <string.h>
 #include <math.h>
 #include <stdbool.h>

src/lib.c

@@ -25,7 +25,7 @@ inline int _strncpy(char *dest, const char *src, int n) {
 	}
 	return i;
 }
-uint16_t crc16_ccitt(char* data, uint16_t len) {
+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);

src/lib.h

@@ -8,7 +8,7 @@ void msleep(unsigned long ms);
 int _strnlen(const char *s, int maxlen);
 int _strncpy(char *dest, const char *src, int n);
 
-uint16_t crc16_ccitt(char *data, uint16_t len);
+uint16_t crc16_ccitt(const char *data, uint16_t len);
 
 uint16_t get_block_from_group(RDSGroup *group, uint8_t block);
 

src/lua_rds.c

@@ -406,6 +406,13 @@ int lua_get_available_rds_streams(lua_State *localL) {
     return 1;
 }
 
+int lua_crc16(lua_State *localL) {
+    size_t len;
+    const char* data = luaL_checklstring(localL, 1, &len);
+    lua_pushinteger(localL, crc16_ccitt(data, len));
+    return 1;
+}
+
 void init_lua(RDSModulator* rds_mod) {
     static int mutex_initialized = 0;
     mod = rds_mod;
@@ -524,6 +531,8 @@ void init_lua(RDSModulator* rds_mod) {
     lua_register(L, "get_userdata", lua_get_userdata);
     lua_register(L, "get_userdata_offset", lua_get_userdata_offset);
 
+    lua_register(L, "crc16", lua_crc16);
+
     if (luaL_loadfile(L, "/etc/rds95.lua") != LUA_OK) {
         fprintf(stderr, "Lua error loading file: %s\n", lua_tostring(L, -1));
         lua_pop(L, 1);