struct php_stream_ops

typedef struct _php_stream_ops {
             /* all streams MUST implement these operations */
             size_t (*write)(php_stream *stream, const char *buf, size_t count TSRMLS_DC);
             size_t (*read)(php_stream *stream, char *buf, size_t count TSRMLS_DC);
             int (*close)(php_stream *stream, int close_handle TSRMLS_DC);
             int (*flush)(php_stream *stream TSRMLS_DC);
             
             const char *label; /* name describing this class of stream */
             
             /* these operations are optional, and may be set to NULL if the stream does not
              * support a particular operation */
            int (*seek)(php_stream *stream, off_t offset, int whence TSRMLS_DC);
            char *(*gets)(php_stream *stream, char *buf, size_t size TSRMLS_DC);
            int (*cast)(php_stream *stream, int castas, void **ret TSRMLS_DC);
            int (*stat)(php_stream *stream, php_stream_statbuf *ssb TSRMLS_DC);
         } php_stream_ops;