int BIO_method_type(const BIO *b);

typedef void bio_info_cb(struct bio_st *, int, const char *, int, long, long);

#ifndef OPENSSL_SYS_WIN16
typedef struct bio_method_st
	{
	int type;
	const char *name;
	int (*bwrite)(BIO *, const char *, int);
	int (*bread)(BIO *, char *, int);
	int (*bputs)(BIO *, const char *);
	int (*bgets)(BIO *, char *, int);
	long (*ctrl)(BIO *, int, long, void *);
	int (*create)(BIO *);
	int (*destroy)(BIO *);
        long (*callback_ctrl)(BIO *, int, bio_info_cb *);
	} BIO_METHOD;
#else
typedef struct bio_method_st
	{
	int type;
	const char *name;
	int (_far *bwrite)();
	int (_far *bread)();
	int (_far *bputs)();
	int (_far *bgets)();
	long (_far *ctrl)();
	int (_far *create)();
	int (_far *destroy)();
	long (_far *callback_ctrl)();
	} BIO_METHOD;
#endif

struct bio_st
	{
	BIO_METHOD *method;
	/* bio, mode, argp, argi, argl, ret */
	long (*callback)(struct bio_st *,int,const char *,int, long,long);
	char *cb_arg; /* first argument for the callback */

	int init;
	int shutdown;
	int flags;	/* extra storage */
	int retry_reason;
	int num;
	void *ptr;
	struct bio_st *next_bio;	/* used by filter BIOs */
	struct bio_st *prev_bio;	/* used by filter BIOs */
	int references;
	unsigned long num_read;
	unsigned long num_write;

	CRYPTO_EX_DATA ex_data;
	};

DECLARE_STACK_OF(BIO)

typedef struct bio_f_buffer_ctx_struct
	{
	/* BIO *bio; */ /* this is now in the BIO struct */
	int ibuf_size;	/* how big is the input buffer */
	int obuf_size;	/* how big is the output buffer */

	char *ibuf;		/* the char array */
	int ibuf_len;		/* how many bytes are in it */
	int ibuf_off;		/* write/read offset */

	char *obuf;		/* the char array */
	int obuf_len;		/* how many bytes are in it */
	int obuf_off;		/* write/read offset */
	} BIO_F_BUFFER_CTX;

/* connect BIO stuff */
#define BIO_CONN_S_BEFORE		1
#define BIO_CONN_S_GET_IP		2
#define BIO_CONN_S_GET_PORT		3
#define BIO_CONN_S_CREATE_SOCKET	4
#define BIO_CONN_S_CONNECT		5
#define BIO_CONN_S_OK			6
#define BIO_CONN_S_BLOCKED_CONNECT	7
#define BIO_CONN_S_NBIO			8
/*#define BIO_CONN_get_param_hostname	BIO_ctrl */

#define BIO_C_SET_CONNECT			100
#define BIO_C_DO_STATE_MACHINE			101
#define BIO_C_SET_NBIO				102
#define BIO_C_SET_PROXY_PARAM			103
#define BIO_C_SET_FD				104
#define BIO_C_GET_FD				105
#define BIO_C_SET_FILE_PTR			106
#define BIO_C_GET_FILE_PTR			107
#define BIO_C_SET_FILENAME			108
#define BIO_C_SET_SSL				109
#define BIO_C_GET_SSL				110
#define BIO_C_SET_MD				111
#define BIO_C_GET_MD				112
#define BIO_C_GET_CIPHER_STATUS			113
#define BIO_C_SET_BUF_MEM			114
#define BIO_C_GET_BUF_MEM_PTR			115
#define BIO_C_GET_BUFF_NUM_LINES		116
#define BIO_C_SET_BUFF_SIZE			117
#define BIO_C_SET_ACCEPT			118
#define BIO_C_SSL_MODE				119
#define BIO_C_GET_MD_CTX			120
#define BIO_C_GET_PROXY_PARAM			121
#define BIO_C_SET_BUFF_READ_DATA		122 /* data to read first */
#define BIO_C_GET_CONNECT			123
#define BIO_C_GET_ACCEPT			124
#define BIO_C_SET_SSL_RENEGOTIATE_BYTES		125
#define BIO_C_GET_SSL_NUM_RENEGOTIATES		126
#define BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT	127
#define BIO_C_FILE_SEEK				128
#define BIO_C_GET_CIPHER_CTX			129
#define BIO_C_SET_BUF_MEM_EOF_RETURN		130/*return end of input value*/
#define BIO_C_SET_BIND_MODE			131
#define BIO_C_GET_BIND_MODE			132
#define BIO_C_FILE_TELL				133
#define BIO_C_GET_SOCKS				134
#define BIO_C_SET_SOCKS				135

#define BIO_C_SET_WRITE_BUF_SIZE		136/* for BIO_s_bio */
#define BIO_C_GET_WRITE_BUF_SIZE		137
#define BIO_C_MAKE_BIO_PAIR			138
#define BIO_C_DESTROY_BIO_PAIR			139
#define BIO_C_GET_WRITE_GUARANTEE		140
#define BIO_C_GET_READ_REQUEST			141
#define BIO_C_SHUTDOWN_WR			142
#define BIO_C_NREAD0				143
#define BIO_C_NREAD				144
#define BIO_C_NWRITE0				145
#define BIO_C_NWRITE				146
#define BIO_C_RESET_READ_REQUEST		147
#define BIO_C_SET_MD_CTX			148


#define BIO_set_app_data(s,arg)		BIO_set_ex_data(s,0,arg)
#define BIO_get_app_data(s)		BIO_get_ex_data(s,0)

/* BIO_s_connect() and BIO_s_socks4a_connect() */
#define BIO_set_conn_hostname(b,name) BIO_ctrl(b,BIO_C_SET_CONNECT,0,(char *)name)
#define BIO_set_conn_port(b,port) BIO_ctrl(b,BIO_C_SET_CONNECT,1,(char *)port)
#define BIO_set_conn_ip(b,ip)	  BIO_ctrl(b,BIO_C_SET_CONNECT,2,(char *)ip)
#define BIO_set_conn_int_port(b,port) BIO_ctrl(b,BIO_C_SET_CONNECT,3,(char *)port)
#define BIO_get_conn_hostname(b)  BIO_ptr_ctrl(b,BIO_C_GET_CONNECT,0)
#define BIO_get_conn_port(b)      BIO_ptr_ctrl(b,BIO_C_GET_CONNECT,1)
#define BIO_get_conn_ip(b) 		 BIO_ptr_ctrl(b,BIO_C_GET_CONNECT,2)
#define BIO_get_conn_int_port(b) BIO_int_ctrl(b,BIO_C_GET_CONNECT,3)


#define BIO_set_nbio(b,n)	BIO_ctrl(b,BIO_C_SET_NBIO,(n),NULL)

/* BIO_s_accept_socket() */
#define BIO_set_accept_port(b,name) BIO_ctrl(b,BIO_C_SET_ACCEPT,0,(char *)name)
#define BIO_get_accept_port(b)	BIO_ptr_ctrl(b,BIO_C_GET_ACCEPT,0)
/* #define BIO_set_nbio(b,n)	BIO_ctrl(b,BIO_C_SET_NBIO,(n),NULL) */
#define BIO_set_nbio_accept(b,n) BIO_ctrl(b,BIO_C_SET_ACCEPT,1,(n)?"a":NULL)
#define BIO_set_accept_bios(b,bio) BIO_ctrl(b,BIO_C_SET_ACCEPT,2,(char *)bio)

#define BIO_BIND_NORMAL			0
#define BIO_BIND_REUSEADDR_IF_UNUSED	1
#define BIO_BIND_REUSEADDR		2
#define BIO_set_bind_mode(b,mode) BIO_ctrl(b,BIO_C_SET_BIND_MODE,mode,NULL)
#define BIO_get_bind_mode(b,mode) BIO_ctrl(b,BIO_C_GET_BIND_MODE,0,NULL)

#define BIO_do_connect(b)	BIO_do_handshake(b)
#define BIO_do_accept(b)	BIO_do_handshake(b)
#define BIO_do_handshake(b)	BIO_ctrl(b,BIO_C_DO_STATE_MACHINE,0,NULL)

/* BIO_s_proxy_client() */
#define BIO_set_url(b,url)	BIO_ctrl(b,BIO_C_SET_PROXY_PARAM,0,(char *)(url))
#define BIO_set_proxies(b,p)	BIO_ctrl(b,BIO_C_SET_PROXY_PARAM,1,(char *)(p))
/* BIO_set_nbio(b,n) */
#define BIO_set_filter_bio(b,s) BIO_ctrl(b,BIO_C_SET_PROXY_PARAM,2,(char *)(s))
/* BIO *BIO_get_filter_bio(BIO *bio); */
#define BIO_set_proxy_cb(b,cb) BIO_callback_ctrl(b,BIO_C_SET_PROXY_PARAM,3,(void *(*cb)()))
#define BIO_set_proxy_header(b,sk) BIO_ctrl(b,BIO_C_SET_PROXY_PARAM,4,(char *)sk)
#define BIO_set_no_connect_return(b,bool) BIO_int_ctrl(b,BIO_C_SET_PROXY_PARAM,5,bool)

#define BIO_get_proxy_header(b,skp) BIO_ctrl(b,BIO_C_GET_PROXY_PARAM,0,(char *)skp)
#define BIO_get_proxies(b,pxy_p) BIO_ctrl(b,BIO_C_GET_PROXY_PARAM,1,(char *)(pxy_p))
#define BIO_get_url(b,url)	BIO_ctrl(b,BIO_C_GET_PROXY_PARAM,2,(char *)(url))
#define BIO_get_no_connect_return(b)	BIO_ctrl(b,BIO_C_GET_PROXY_PARAM,5,NULL)

#define BIO_set_fd(b,fd,c)	BIO_int_ctrl(b,BIO_C_SET_FD,c,fd)
#define BIO_get_fd(b,c)		BIO_ctrl(b,BIO_C_GET_FD,0,(char *)c)

#define BIO_set_fp(b,fp,c)	BIO_ctrl(b,BIO_C_SET_FILE_PTR,c,(char *)fp)
#define BIO_get_fp(b,fpp)	BIO_ctrl(b,BIO_C_GET_FILE_PTR,0,(char *)fpp)

#define BIO_seek(b,ofs)	(int)BIO_ctrl(b,BIO_C_FILE_SEEK,ofs,NULL)
#define BIO_tell(b)	(int)BIO_ctrl(b,BIO_C_FILE_TELL,0,NULL)

/* name is cast to lose const, but might be better to route through a function
   so we can do it safely */
#ifdef CONST_STRICT
/* If you are wondering why this isn't defined, its because CONST_STRICT is
 * purely a compile-time kludge to allow const to be checked.
 */
int BIO_read_filename(BIO *b,const char *name);
#else
#define BIO_read_filename(b,name) BIO_ctrl(b,BIO_C_SET_FILENAME, \
		BIO_CLOSE|BIO_FP_READ,(char *)name)
#endif
#define BIO_write_filename(b,name) BIO_ctrl(b,BIO_C_SET_FILENAME, \
		BIO_CLOSE|BIO_FP_WRITE,name)
#define BIO_append_filename(b,name) BIO_ctrl(b,BIO_C_SET_FILENAME, \
		BIO_CLOSE|BIO_FP_APPEND,name)
#define BIO_rw_filename(b,name) BIO_ctrl(b,BIO_C_SET_FILENAME, \
		BIO_CLOSE|BIO_FP_READ|BIO_FP_WRITE,name)

/* WARNING WARNING, this ups the reference count on the read bio of the
 * SSL structure.  This is because the ssl read BIO is now pointed to by
 * the next_bio field in the bio.  So when you free the BIO, make sure
 * you are doing a BIO_free_all() to catch the underlying BIO. */
#define BIO_set_ssl(b,ssl,c)	BIO_ctrl(b,BIO_C_SET_SSL,c,(char *)ssl)
#define BIO_get_ssl(b,sslp)	BIO_ctrl(b,BIO_C_GET_SSL,0,(char *)sslp)
#define BIO_set_ssl_mode(b,client)	BIO_ctrl(b,BIO_C_SSL_MODE,client,NULL)
#define BIO_set_ssl_renegotiate_bytes(b,num) \
	BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_BYTES,num,NULL);
#define BIO_get_num_renegotiates(b) \
	BIO_ctrl(b,BIO_C_GET_SSL_NUM_RENEGOTIATES,0,NULL);
#define BIO_set_ssl_renegotiate_timeout(b,seconds) \
	BIO_ctrl(b,BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT,seconds,NULL);

/* defined in evp.h */
/* #define BIO_set_md(b,md)	BIO_ctrl(b,BIO_C_SET_MD,1,(char *)md) */

#define BIO_get_mem_data(b,pp)	BIO_ctrl(b,BIO_CTRL_INFO,0,(char *)pp)
#define BIO_set_mem_buf(b,bm,c)	BIO_ctrl(b,BIO_C_SET_BUF_MEM,c,(char *)bm)
#define BIO_get_mem_ptr(b,pp)	BIO_ctrl(b,BIO_C_GET_BUF_MEM_PTR,0,(char *)pp)
#define BIO_set_mem_eof_return(b,v) \
				BIO_ctrl(b,BIO_C_SET_BUF_MEM_EOF_RETURN,v,NULL)

/* For the BIO_f_buffer() type */
#define BIO_get_buffer_num_lines(b)	BIO_ctrl(b,BIO_C_GET_BUFF_NUM_LINES,0,NULL)
#define BIO_set_buffer_size(b,size)	BIO_ctrl(b,BIO_C_SET_BUFF_SIZE,size,NULL)
#define BIO_set_read_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,0)
#define BIO_set_write_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,1)
#define BIO_set_buffer_read_data(b,buf,num) BIO_ctrl(b,BIO_C_SET_BUFF_READ_DATA,num,buf)

/* Don't use the next one unless you know what you are doing :-) */
#define BIO_dup_state(b,ret)	BIO_ctrl(b,BIO_CTRL_DUP,0,(char *)(ret))

#define BIO_reset(b)		(int)BIO_ctrl(b,BIO_CTRL_RESET,0,NULL)
#define BIO_eof(b)		(int)BIO_ctrl(b,BIO_CTRL_EOF,0,NULL)
#define BIO_set_close(b,c)	(int)BIO_ctrl(b,BIO_CTRL_SET_CLOSE,(c),NULL)
#define BIO_get_close(b)	(int)BIO_ctrl(b,BIO_CTRL_GET_CLOSE,0,NULL)
#define BIO_pending(b)		(int)BIO_ctrl(b,BIO_CTRL_PENDING,0,NULL)
#define BIO_wpending(b)		(int)BIO_ctrl(b,BIO_CTRL_WPENDING,0,NULL)
/* ...pending macros have inappropriate return type */
size_t BIO_ctrl_pending(BIO *b);
size_t BIO_ctrl_wpending(BIO *b);
#define BIO_flush(b)		(int)BIO_ctrl(b,BIO_CTRL_FLUSH,0,NULL)
#define BIO_get_info_callback(b,cbp) (int)BIO_ctrl(b,BIO_CTRL_GET_CALLBACK,0, \
						   cbp)
#define BIO_set_info_callback(b,cb) (int)BIO_callback_ctrl(b,BIO_CTRL_SET_CALLBACK,cb)

/* For the BIO_f_buffer() type */