virtual SQInteger Read(void *buffer, SQInteger size) = 0;
virtual SQInteger Write(void *buffer, SQInteger size) = 0;
virtual SQInteger Flush() = 0;
virtual SQInteger Read(void *buffer, SQInteger size) = 0;
virtual SQInteger Write(void *buffer, SQInteger size) = 0;
virtual SQInteger Flush() = 0;