btif: Lighter weight file existence check

We switch from the heavier weight fopen() to using access() to
check for file existence and readability.  This avoids some of
the file opening overhead we don't need here.

Test: TreeHugger
Change-Id: Ib47b24e9d96803b7822535f9f566aa7818b38953

parent 92bc679e

system/btif/src/btif_config.cc

+1 −4

Original line number	Diff line number	Diff line
		@@ -665,11 +665,8 @@ static std::string hash_file(const char* filename) {

		static std::string read_checksum_file(const char* checksum_filename) {
		// Ensure file exists
		FILE* fp = fopen(checksum_filename, "rb");
		if (!fp) {
		if (access(checksum_filename, R_OK) != 0) {
		return "";
		} else {
		fclose(fp);
		}
		std::string output = btifKeystore.Decrypt(checksum_filename);
		return output;