dont allow empty compound key names

src/json/read.c

@@ -525,6 +525,12 @@ static bool json_read_compound(tagdata_t *data, const stream_t *stream) {
 		char *name = next.data.string.data;
 		int name_len = next.data.string.len;
 
+		if (name_len < 1) {
+			free(tags);
+			free(name);
+			return false;
+		}
+		
 		if (json_next_token(&next, stream) == false || next.type != TOK_COLON) {
 			free(tags);
 			free(name);

src/main.c

@@ -1,4 +1,5 @@
 #include "lib.h"
+#include "stream.h"
 #include "tag.h"
 #include "flags.h"
 
@@ -42,12 +43,15 @@ int main(int argc, char **argv) {
 	tag_t tag;
 	if (tag_read(&tag, &flags.in, flags.fin) == false)
 		error_and_die("error: failed to read tag\n");
+	stream_close(&flags.in);
 
 	if (tag.type != TAG_COMPOUND)
 		error_and_die("error: nbt tag not a valid compound tag\n");
 
 	if (tag_print(&tag, &flags.out, flags.fout) == false)
 		error_and_die("error: failed to write tag\n");
+	stream_close(&flags.out);
+	
 	tag_free(&tag);
 
 	return 0;

src/nbt/read.c

@@ -131,6 +131,11 @@ static bool nbt_read_compound(tagdata_t *data, const stream_t *stream) {
 			return false;
 		}
 
+		if (tag.name_len < 1) {
+			free(tags);
+			return false;
+		}
+
 		if (tag.type == TAG_END)
 			break;