/* 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)

 		{

 		if ((new=BIO_new(bio->method)) == NULL) goto err;

 		new->callback=bio->callback;

 		new->cb_arg=bio->cb_arg;

 		new->init=bio->init;

 		new->shutdown=bio->shutdown;

 		new->flags=bio->flags;

 		/* This will let SSL_s_sock() work with stdin/stdout */

 		new->num=bio->num;

 		if (!BIO_dup_state(bio,(char *)new))

 			{

 			BIO_free(new);

 			goto err;

 			}

 		/* copy app data */

 		if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_BIO, &new->ex_data,

 					&bio->ex_data))

 			goto err;

 		if (ret == NULL)

 			{

 			eoc=new;

 			ret=eoc;

 			}

 		else

 			{

 			BIO_push(eoc,new);

 			eoc=new;

 			}

 		}

 	return(ret);

 err:

 	if (ret != NULL)

 		BIO_free(ret);

 	return(NULL);	

 	}

 EXPORT_C void BIO_copy_next_retry(BIO *b)

 	{

 	BIO_set_flags(b,BIO_get_retry_flags(b->next_bio));

 	b->retry_reason=b->next_bio->retry_reason;

 	}

 EXPORT_C int BIO_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,

 	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)

 	{

 	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_BIO, argl, argp,

 				new_func, dup_func, free_func);

 	}

 EXPORT_C int BIO_set_ex_data(BIO *bio, int idx, void *data)

 	{

 	return(CRYPTO_set_ex_data(&(bio->ex_data),idx,data));

 	}

 EXPORT_C void *BIO_get_ex_data(BIO *bio, int idx)

 	{

 	return(CRYPTO_get_ex_data(&(bio->ex_data),idx));

 	}

 EXPORT_C unsigned long BIO_number_read(BIO *bio)

 {

 	if(bio) return bio->num_read;

 	return 0;

 }

 EXPORT_C unsigned long BIO_number_written(BIO *bio)

 {

 	if(bio) return bio->num_write;

 	return 0;

 }

 IMPLEMENT_STACK_OF(BIO)