/* crypto/bio/bio_lib.c */

/* 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.]

 */

#include <stdio.h>

#include <errno.h>

#include <openssl/crypto.h>

#include "cryptlib.h"

#include <openssl/bio.h>

#include <openssl/stack.h>

EXPORT_C BIO *BIO_new(BIO_METHOD *method)

	{

	BIO *ret=NULL;

	ret=(BIO *)OPENSSL_malloc(sizeof(BIO));

	if (ret == NULL)

		{

		BIOerr(BIO_F_BIO_NEW,ERR_R_MALLOC_FAILURE);

		return(NULL);

		}

#ifdef SYMBIAN

   memset(ret,0,sizeof(BIO));

#endif		

	if (!BIO_set(ret,method))

		{

		OPENSSL_free(ret);

		ret=NULL;

		}

	return(ret);

	}

EXPORT_C int BIO_set(BIO *bio, BIO_METHOD *method)

	{

	bio->method=method;

	bio->callback=NULL;

	bio->cb_arg=NULL;

	bio->init=0;

	bio->shutdown=1;

	bio->flags=0;

	bio->retry_reason=0;

	bio->num=0;

	bio->ptr=NULL;

	bio->prev_bio=NULL;

	bio->next_bio=NULL;

	bio->references=1;

	bio->num_read=0L;

	bio->num_write=0L;

	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);

	if (method->create != NULL)

		if (!method->create(bio))

			{

			CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio,

					&bio->ex_data);

			return(0);

			}

	return(1);

	}

EXPORT_C int BIO_free(BIO *a)

	{

	int ret=0,i;

	if (a == NULL) return(0);

	i=CRYPTO_add(&a->references,-1,CRYPTO_LOCK_BIO);

#ifdef REF_PRINT

	REF_PRINT("BIO",a);

#endif

	if (i > 0) return(1);

#ifdef REF_CHECK

	if (i < 0)

		{

		fprintf(stderr,"BIO_free, bad reference count\n");

		abort();

		}

#endif

	if ((a->callback != NULL) &&

		((i=(int)a->callback(a,BIO_CB_FREE,NULL,0,0L,1L)) <= 0))

			return(i);

	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, a, &a->ex_data);

	if ((a->method == NULL) || (a->method->destroy == NULL)) return(1);

	ret=a->method->destroy(a);

	OPENSSL_free(a);

	return(1);

	}

EXPORT_C void BIO_vfree(BIO *a)

    { BIO_free(a); }

EXPORT_C void BIO_clear_flags(BIO *b, int flags)

	{

	b->flags &= ~flags;

	}

EXPORT_C int	BIO_test_flags(const BIO *b, int flags)

	{

	return (b->flags & flags);

	}

EXPORT_C void	BIO_set_flags(BIO *b, int flags)

	{

	b->flags |= flags;

	}

EXPORT_C long (*BIO_get_callback(const BIO *b))(struct bio_st *,int,const char *,int, long,long)

	{

	return b->callback;

	}

EXPORT_C void BIO_set_callback(BIO *b, long (*cb)(struct bio_st *,int,const char *,int, long,long))

	{

	b->callback = cb;

	}

EXPORT_C void BIO_set_callback_arg(BIO *b, char *arg)

	{

	b->cb_arg = arg;

	}

EXPORT_C char * BIO_get_callback_arg(const BIO *b)

	{

	return b->cb_arg;

	}

EXPORT_C const char * BIO_method_name(const BIO *b)

	{

	return b->method->name;

	}

EXPORT_C int BIO_method_type(const BIO *b)

	{

	return b->method->type;

	}

EXPORT_C int BIO_read(BIO *b, void *out, int outl)

	{

	int i;

	long (*cb)(BIO *,int,const char *,int,long,long);

	if ((b == NULL) || (b->method == NULL) || (b->method->bread == NULL))

		{

		BIOerr(BIO_F_BIO_READ,BIO_R_UNSUPPORTED_METHOD);

		return(-2);

		}

	cb=b->callback;

	if ((cb != NULL) &&

		((i=(int)cb(b,BIO_CB_READ,out,outl,0L,1L)) <= 0))

			return(i);

	if (!b->init)

		{

		BIOerr(BIO_F_BIO_READ,BIO_R_UNINITIALIZED);

		return(-2);

		}

	i=b->method->bread(b,out,outl);

	if (i > 0) b->num_read+=(unsigned long)i;

	if (cb != NULL)

		i=(int)cb(b,BIO_CB_READ|BIO_CB_RETURN,out,outl,

			0L,(long)i);

	return(i);

	}

EXPORT_C int BIO_write(BIO *b, const void *in, int inl)

	{

	int i;

	long (*cb)(BIO *,int,const char *,int,long,long);

	if (b == NULL)

		return(0);

	cb=b->callback;

	if ((b->method == NULL) || (b->method->bwrite == NULL))

		{

		BIOerr(BIO_F_BIO_WRITE,BIO_R_UNSUPPORTED_METHOD);

		return(-2);

		}

	if ((cb != NULL) &&

		((i=(int)cb(b,BIO_CB_WRITE,in,inl,0L,1L)) <= 0))

			return(i);

	if (!b->init)

		{

		BIOerr(BIO_F_BIO_WRITE,BIO_R_UNINITIALIZED);

		return(-2);

		}

	i=b->method->bwrite(b,in,inl);

	if (i > 0) b->num_write+=(unsigned long)i;

	if (cb != NULL)

		i=(int)cb(b,BIO_CB_WRITE|BIO_CB_RETURN,in,inl,

			0L,(long)i);

	return(i);

	}

EXPORT_C int BIO_puts(BIO *b, const char *in)

	{

	int i;

	long (*cb)(BIO *,int,const char *,int,long,long);

	if ((b == NULL) || (b->method == NULL) || (b->method->bputs == NULL))

		{

		BIOerr(BIO_F_BIO_PUTS,BIO_R_UNSUPPORTED_METHOD);

		return(-2);

		}

	cb=b->callback;

	if ((cb != NULL) &&

		((i=(int)cb(b,BIO_CB_PUTS,in,0,0L,1L)) <= 0))

			return(i);

	if (!b->init)

		{

		BIOerr(BIO_F_BIO_PUTS,BIO_R_UNINITIALIZED);

		return(-2);

		}

	i=b->method->bputs(b,in);

	if (i > 0) b->num_write+=(unsigned long)i;

	if (cb != NULL)

		i=(int)cb(b,BIO_CB_PUTS|BIO_CB_RETURN,in,0,

			0L,(long)i);

	return(i);

	}

EXPORT_C int BIO_gets(BIO *b, char *in, int inl)

	{

	int i;

	long (*cb)(BIO *,int,const char *,int,long,long);

	if ((b == NULL) || (b->method == NULL) || (b->method->bgets == NULL))

		{

		BIOerr(BIO_F_BIO_GETS,BIO_R_UNSUPPORTED_METHOD);

		return(-2);

		}

	cb=b->callback;

	if ((cb != NULL) &&

		((i=(int)cb(b,BIO_CB_GETS,in,inl,0L,1L)) <= 0))

			return(i);

	if (!b->init)

		{

		BIOerr(BIO_F_BIO_GETS,BIO_R_UNINITIALIZED);

		return(-2);

		}

	i=b->method->bgets(b,in,inl);

	if (cb != NULL)

		i=(int)cb(b,BIO_CB_GETS|BIO_CB_RETURN,in,inl,

			0L,(long)i);

	return(i);

	}

EXPORT_C int BIO_indent(BIO *b,int indent,int max)

	{

	if(indent < 0)

		indent=0;

	if(indent > max)

		indent=max;

	while(indent--)

		if(BIO_puts(b," ") != 1)

			return 0;

	return 1;

	}

EXPORT_C long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg)

	{

	int i;

	i=iarg;

	return(BIO_ctrl(b,cmd,larg,(char *)&i));

	}

EXPORT_C char *BIO_ptr_ctrl(BIO *b, int cmd, long larg)

	{

	char *p=NULL;

	if (BIO_ctrl(b,cmd,larg,(char *)&p) <= 0)

		return(NULL);

	else

		return(p);

	}

EXPORT_C long BIO_ctrl(BIO *b, int cmd, long larg, void *parg)

	{

	long ret;

	long (*cb)(BIO *,int,const char *,int,long,long);

	if (b == NULL) return(0);

	if ((b->method == NULL) || (b->method->ctrl == NULL))

		{

		BIOerr(BIO_F_BIO_CTRL,BIO_R_UNSUPPORTED_METHOD);

		return(-2);

		}

	cb=b->callback;

	if ((cb != NULL) &&

		((ret=cb(b,BIO_CB_CTRL,parg,cmd,larg,1L)) <= 0))

		return(ret);

	ret=b->method->ctrl(b,cmd,larg,parg);

	if (cb != NULL)

		ret=cb(b,BIO_CB_CTRL|BIO_CB_RETURN,parg,cmd,

			larg,ret);

	return(ret);

	}

EXPORT_C long BIO_callback_ctrl(BIO *b, int cmd, void (*fp)(struct bio_st *, int, const char *, int, long, long))

	{

	long ret;

	long (*cb)(BIO *,int,const char *,int,long,long);

	if (b == NULL) return(0);

	if ((b->method == NULL) || (b->method->callback_ctrl == NULL))

		{

		BIOerr(BIO_F_BIO_CALLBACK_CTRL,BIO_R_UNSUPPORTED_METHOD);

		return(-2);

		}

	cb=b->callback;

	if ((cb != NULL) &&

		((ret=cb(b,BIO_CB_CTRL,(void *)&fp,cmd,0,1L)) <= 0))

		return(ret);

	ret=b->method->callback_ctrl(b,cmd,fp);

	if (cb != NULL)

		ret=cb(b,BIO_CB_CTRL|BIO_CB_RETURN,(void *)&fp,cmd,

			0,ret);

	return(ret);

	}

/* It is unfortunate to duplicate in functions what the BIO_(w)pending macros

 * do; but those macros have inappropriate return type, and for interfacing

 * from other programming languages, C macros aren't much of a help anyway. */

EXPORT_C size_t BIO_ctrl_pending(BIO *bio)

	{

	return BIO_ctrl(bio, BIO_CTRL_PENDING, 0, NULL);

	}

EXPORT_C size_t BIO_ctrl_wpending(BIO *bio)

	{

	return BIO_ctrl(bio, BIO_CTRL_WPENDING, 0, NULL);

	}

/* put the 'bio' on the end of b's list of operators */

EXPORT_C BIO *BIO_push(BIO *b, BIO *bio)

	{

	BIO *lb;

	if (b == NULL) return(bio);

	lb=b;

	while (lb->next_bio != NULL)

		lb=lb->next_bio;

	lb->next_bio=bio;

	if (bio != NULL)

		bio->prev_bio=lb;

	/* called to do internal processing */

	BIO_ctrl(b,BIO_CTRL_PUSH,0,NULL);

	return(b);

	}

/* Remove the first and return the rest */

EXPORT_C BIO *BIO_pop(BIO *b)

	{

	BIO *ret;

	if (b == NULL) return(NULL);

	ret=b->next_bio;

	BIO_ctrl(b,BIO_CTRL_POP,0,NULL);

	if (b->prev_bio != NULL)

		b->prev_bio->next_bio=b->next_bio;

	if (b->next_bio != NULL)

		b->next_bio->prev_bio=b->prev_bio;

	b->next_bio=NULL;

	b->prev_bio=NULL;

	return(ret);

	}

EXPORT_C BIO *BIO_get_retry_BIO(BIO *bio, int *reason)

	{

	BIO *b,*last;

	b=last=bio;

	for (;;)

		{

		if (!BIO_should_retry(b)) break;

		last=b;

		b=b->next_bio;

		if (b == NULL) break;

		}

	if (reason != NULL) *reason=last->retry_reason;

	return(last);

	}

EXPORT_C int BIO_get_retry_reason(BIO *bio)

	{

	return(bio->retry_reason);

	}

EXPORT_C BIO *BIO_find_type(BIO *bio, int type)

	{

	int mt,mask;

	if(!bio) return NULL;

	mask=type&0xff;

	do	{

		if (bio->method != NULL)

			{

			mt=bio->method->type;

			if (!mask)

				{

				if (mt & type) return(bio);

				}

			else if (mt == type)

				return(bio);

			}

		bio=bio->next_bio;

		} while (bio != NULL);

	return(NULL);

	}

EXPORT_C BIO *BIO_next(BIO *b)

	{

	if(!b) return NULL;

	return b->next_bio;

	}

EXPORT_C void BIO_free_all(BIO *bio)

	{

	BIO *b;

	int ref;

	while (bio != NULL)

		{

		b=bio;

		ref=b->references;

		bio=bio->next_bio;

		BIO_free(b);

		/* Since ref count > 1, don't free anyone else. */

		if (ref > 1) break;

		}

	}

EXPORT_C BIO *BIO_dup_chain(BIO *in)

	{

	BIO *ret=NULL,*eoc=NULL,*bio,*new;

	for (bio=in; bio != NULL; bio=bio->next_bio)

		{