/* crypto/bio/bio.h */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#ifndef HEADER_BIO_H
#define HEADER_BIO_H

#ifndef OPENSSL_NO_FP_API
# include <stdio.h>
#endif
#include <stdarg.h>

#include <openssl/crypto.h>
#include <openssl/e_os2.h>

#ifdef  __cplusplus
extern "C" {
#endif

/* These are the 'types' of BIOs */
#define BIO_TYPE_NONE		0
#define BIO_TYPE_MEM		(1|0x0400)
#define BIO_TYPE_FILE		(2|0x0400)

#define BIO_TYPE_FD		(4|0x0400|0x0100)
#define BIO_TYPE_SOCKET		(5|0x0400|0x0100)
#define BIO_TYPE_NULL		(6|0x0400)
#define BIO_TYPE_SSL		(7|0x0200)
#define BIO_TYPE_MD		(8|0x0200)		/* passive filter */
#define BIO_TYPE_BUFFER		(9|0x0200)		/* filter */
#define BIO_TYPE_CIPHER		(10|0x0200)		/* filter */
#define BIO_TYPE_BASE64		(11|0x0200)		/* filter */
#define BIO_TYPE_CONNECT	(12|0x0400|0x0100)	/* socket - connect */
#define BIO_TYPE_ACCEPT		(13|0x0400|0x0100)	/* socket for accept */
#define BIO_TYPE_PROXY_CLIENT	(14|0x0200)		/* client proxy BIO */
#define BIO_TYPE_PROXY_SERVER	(15|0x0200)		/* server proxy BIO */
#define BIO_TYPE_NBIO_TEST	(16|0x0200)		/* server proxy BIO */
#define BIO_TYPE_NULL_FILTER	(17|0x0200)
#define BIO_TYPE_BER		(18|0x0200)		/* BER -> bin filter */
#define BIO_TYPE_BIO		(19|0x0400)		/* (half a) BIO pair */
#define BIO_TYPE_LINEBUFFER	(20|0x0200)		/* filter */

#define BIO_TYPE_DESCRIPTOR	0x0100	/* socket, fd, connect or accept */
#define BIO_TYPE_FILTER		0x0200
#define BIO_TYPE_SOURCE_SINK	0x0400

/* BIO_FILENAME_READ|BIO_CLOSE to open or close on free.
 * BIO_set_fp(in,stdin,BIO_NOCLOSE); */
#define BIO_NOCLOSE		0x00
#define BIO_CLOSE		0x01

/* These are used in the following macros and are passed to
 * BIO_ctrl() */
#define BIO_CTRL_RESET		1  /* opt - rewind/zero etc */
#define BIO_CTRL_EOF		2  /* opt - are we at the eof */
#define BIO_CTRL_INFO		3  /* opt - extra tit-bits */
#define BIO_CTRL_SET		4  /* man - set the 'IO' type */
#define BIO_CTRL_GET		5  /* man - get the 'IO' type */
#define BIO_CTRL_PUSH		6  /* opt - internal, used to signify change */
#define BIO_CTRL_POP		7  /* opt - internal, used to signify change */
#define BIO_CTRL_GET_CLOSE	8  /* man - set the 'close' on free */
#define BIO_CTRL_SET_CLOSE	9  /* man - set the 'close' on free */
#define BIO_CTRL_PENDING	10  /* opt - is their more data buffered */
#define BIO_CTRL_FLUSH		11  /* opt - 'flush' buffered output */
#define BIO_CTRL_DUP		12  /* man - extra stuff for 'duped' BIO */
#define BIO_CTRL_WPENDING	13  /* opt - number of bytes still to write */
/* callback is int cb(BIO *bio,state,ret); */
#define BIO_CTRL_SET_CALLBACK	14  /* opt - set callback function */
#define BIO_CTRL_GET_CALLBACK	15  /* opt - set callback function */

#define BIO_CTRL_SET_FILENAME	30	/* BIO_s_file special */

/* modifiers */
#define BIO_FP_READ		0x02
#define BIO_FP_WRITE		0x04
#define BIO_FP_APPEND		0x08
#define BIO_FP_TEXT		0x10

#define BIO_FLAGS_READ		0x01
#define BIO_FLAGS_WRITE		0x02
#define BIO_FLAGS_IO_SPECIAL	0x04
#define BIO_FLAGS_RWS (BIO_FLAGS_READ|BIO_FLAGS_WRITE|BIO_FLAGS_IO_SPECIAL)
#define BIO_FLAGS_SHOULD_RETRY	0x08

/* Used in BIO_gethostbyname() */
#define BIO_GHBN_CTRL_HITS		1
#define BIO_GHBN_CTRL_MISSES		2
#define BIO_GHBN_CTRL_CACHE_SIZE	3
#define BIO_GHBN_CTRL_GET_ENTRY		4
#define BIO_GHBN_CTRL_FLUSH		5

/* Mostly used in the SSL BIO */
/* Not used anymore
 * #define BIO_FLAGS_PROTOCOL_DELAYED_READ 0x10
 * #define BIO_FLAGS_PROTOCOL_DELAYED_WRITE 0x20
 * #define BIO_FLAGS_PROTOCOL_STARTUP	0x40
 */

#define BIO_FLAGS_BASE64_NO_NL	0x100

/* This is used with memory BIOs: it means we shouldn't free up or change the
 * data in any way.
 */
#define BIO_FLAGS_MEM_RDONLY	0x200

#define BIO_set_flags(b,f) ((b)->flags|=(f))
#define BIO_get_flags(b) ((b)->flags)
#define BIO_set_retry_special(b) \
		((b)->flags|=(BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY))
#define BIO_set_retry_read(b) \
		((b)->flags|=(BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY))
#define BIO_set_retry_write(b) \
		((b)->flags|=(BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY))

/* These are normally used internally in BIOs */
#define BIO_clear_flags(b,f) ((b)->flags&= ~(f))
#define BIO_clear_retry_flags(b) \
		((b)->flags&= ~(BIO_FLAGS_RWS|BIO_FLAGS_SHOULD_RETRY))
#define BIO_get_retry_flags(b) \
		((b)->flags&(BIO_FLAGS_RWS|BIO_FLAGS_SHOULD_RETRY))

/* These should be used by the application to tell why we should retry */
#define BIO_should_read(a)		((a)->flags & BIO_FLAGS_READ)
#define BIO_should_write(a)		((a)->flags & BIO_FLAGS_WRITE)
#define BIO_should_io_special(a)	((a)->flags & BIO_FLAGS_IO_SPECIAL)
#define BIO_retry_type(a)		((a)->flags & BIO_FLAGS_RWS)
#define BIO_should_retry(a)		((a)->flags & BIO_FLAGS_SHOULD_RETRY)

/* The next three are used in conjunction with the
 * BIO_should_io_special() condition.  After this returns true,
 * BIO *BIO_get_retry_BIO(BIO *bio, int *reason); will walk the BIO 
 * stack and return the 'reason' for the special and the offending BIO.
 * Given a BIO, BIO_get_retry_reason(bio) will return the code. */
/* Returned from the SSL bio when the certificate retrieval code had an error */
#define BIO_RR_SSL_X509_LOOKUP		0x01
/* Returned from the connect BIO when a connect would have blocked */
#define BIO_RR_CONNECT			0x02
/* Returned from the accept BIO when an accept would have blocked */
#define BIO_RR_ACCEPT			0x03

/* These are passed by the BIO callback */
#define BIO_CB_FREE	0x01
#define BIO_CB_READ	0x02
#define BIO_CB_WRITE	0x03
#define BIO_CB_PUTS	0x04
#define BIO_CB_GETS	0x05
#define BIO_CB_CTRL	0x06

/* The callback is called before and after the underling operation,
 * The BIO_CB_RETURN flag indicates if it is after the call */
#define BIO_CB_RETURN	0x80
#define BIO_CB_return(a) ((a)|BIO_CB_RETURN))
#define BIO_cb_pre(a)	(!((a)&BIO_CB_RETURN))
#define BIO_cb_post(a)	((a)&BIO_CB_RETURN)

#define BIO_set_callback(b,cb)		((b)->callback=(cb))
#define BIO_set_callback_arg(b,arg)	((b)->cb_arg=(char *)(arg))
#define BIO_get_callback_arg(b)		((b)->cb_arg)
#define BIO_get_callback(b)		((b)->callback)
#define BIO_method_name(b)		((b)->method->name)
#define BIO_method_type(b)		((b)->method->type)

typedef struct bio_st BIO;

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