nixio: Use correct datatypes for base64 encode

diff --git a/libs/nixio/src/binary.c b/libs/nixio/src/binary.c
index 2466f98917244ac8cbc3c8eaa2518effff69fdb9..c2de388173689bcd9b9da7253ef028f800020831 100644 (file)
--- a/libs/nixio/src/binary.c
+++ b/libs/nixio/src/binary.c
@@ -192,7 +192,7 @@ static int nixio_bin_unhexlify(lua_State *L) {
 
 static int nixio_bin_b64encode(lua_State *L) {
        size_t len, lenout, pad, i;
-       const char *data = luaL_checklstring(L, 1, &len);
+       const uint8_t *data = (const uint8_t*)luaL_checklstring(L, 1, &len);
 
        lenout = len / 3;
        lenout *= 4;
@@ -213,7 +213,7 @@ static int nixio_bin_b64encode(lua_State *L) {
                return luaL_error(L, NIXIO_OOM);
        }
 
-       char *o = out;
+       uint8_t *o = (uint8_t*)out;
        for (i = 0; i < len; i += 3) {
                uint32_t cv = (data[i] << 16) | (data[i+1] << 8) | data[i+2];
                *(o+3) = nixio__b64encode_tbl[ cv        & 0x3f];