/* crypto/bio/bf_buff.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 "cryptlib.h"

 #include <openssl/bio.h>

 static int buffer_write(BIO *h, const char *buf,int num);

 static int buffer_read(BIO *h, char *buf, int size);

 static int buffer_puts(BIO *h, const char *str);

 static int buffer_gets(BIO *h, char *str, int size);

 static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);

 static int buffer_new(BIO *h);

 static int buffer_free(BIO *data);

 static long buffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);

 #define DEFAULT_BUFFER_SIZE	4096

 static BIO_METHOD methods_buffer=

 	{

 	BIO_TYPE_BUFFER,

 	"buffer",

 	buffer_write,

 	buffer_read,

 	buffer_puts,

 	buffer_gets,

 	buffer_ctrl,

 	buffer_new,

 	buffer_free,

 	buffer_callback_ctrl,

 	};

 EXPORT_C BIO_METHOD *BIO_f_buffer(void)

 	{

 	return(&methods_buffer);

 	}

 static int buffer_new(BIO *bi)

 	{

 	BIO_F_BUFFER_CTX *ctx;

 	ctx=(BIO_F_BUFFER_CTX *)OPENSSL_malloc(sizeof(BIO_F_BUFFER_CTX));

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

 	ctx->ibuf=(char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE);

 	if (ctx->ibuf == NULL) { OPENSSL_free(ctx); return(0); }

 	ctx->obuf=(char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE);

 	if (ctx->obuf == NULL) { OPENSSL_free(ctx->ibuf); OPENSSL_free(ctx); return(0); }

 	ctx->ibuf_size=DEFAULT_BUFFER_SIZE;

 	ctx->obuf_size=DEFAULT_BUFFER_SIZE;

 	ctx->ibuf_len=0;

 	ctx->ibuf_off=0;

 	ctx->obuf_len=0;

 	ctx->obuf_off=0;

 	bi->init=1;

 	bi->ptr=(char *)ctx;

 	bi->flags=0;

 	return(1);

 	}

 static int buffer_free(BIO *a)

 	{

 	BIO_F_BUFFER_CTX *b;

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

 	b=(BIO_F_BUFFER_CTX *)a->ptr;

 	if (b->ibuf != NULL) OPENSSL_free(b->ibuf);

 	if (b->obuf != NULL) OPENSSL_free(b->obuf);

 	OPENSSL_free(a->ptr);

 	a->ptr=NULL;

 	a->init=0;

 	a->flags=0;

 	return(1);

 	}

 static int buffer_read(BIO *b, char *out, int outl)

 	{

 	int i,num=0;

 	BIO_F_BUFFER_CTX *ctx;

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

 	ctx=(BIO_F_BUFFER_CTX *)b->ptr;

 	if ((ctx == NULL) || (b->next_bio == NULL)) return(0);

 	num=0;

 	BIO_clear_retry_flags(b);

 start:

 	i=ctx->ibuf_len;

 	/* If there is stuff left over, grab it */

 	if (i != 0)

 		{

 		if (i > outl) i=outl;

 		memcpy(out,&(ctx->ibuf[ctx->ibuf_off]),i);

 		ctx->ibuf_off+=i;

 		ctx->ibuf_len-=i;

 		num+=i;

 		if (outl == i)  return(num);

 		outl-=i;

 		out+=i;

 		}

 	/* We may have done a partial read. try to do more.

 	 * We have nothing in the buffer.

 	 * If we get an error and have read some data, just return it

 	 * and let them retry to get the error again.

 	 * copy direct to parent address space */

 	if (outl > ctx->ibuf_size)

 		{

 		for (;;)

 			{

 			i=BIO_read(b->next_bio,out,outl);

 			if (i <= 0)

 				{

 				BIO_copy_next_retry(b);

 				if (i < 0) return((num > 0)?num:i);

 				if (i == 0) return(num);

 				}

 			num+=i;

 			if (outl == i) return(num);

 			out+=i;

 			outl-=i;

 			}

 		}

 	/* else */

 	/* we are going to be doing some buffering */

 	i=BIO_read(b->next_bio,ctx->ibuf,ctx->ibuf_size);

 	if (i <= 0)

 		{

 		BIO_copy_next_retry(b);

 		if (i < 0) return((num > 0)?num:i);

 		if (i == 0) return(num);

 		}

 	ctx->ibuf_off=0;

 	ctx->ibuf_len=i;

 	/* Lets re-read using ourselves :-) */

 	goto start;

 	}

 static int buffer_write(BIO *b, const char *in, int inl)

 	{

 	int i,num=0;

 	BIO_F_BUFFER_CTX *ctx;

 	if ((in == NULL) || (inl <= 0)) return(0);

 	ctx=(BIO_F_BUFFER_CTX *)b->ptr;

 	if ((ctx == NULL) || (b->next_bio == NULL)) return(0);

 	BIO_clear_retry_flags(b);

 start:

 	i=ctx->obuf_size-(ctx->obuf_len+ctx->obuf_off);

 	/* add to buffer and return */

 	if (i >= inl)

 		{

 		memcpy(&(ctx->obuf[ctx->obuf_len]),in,inl);

 		ctx->obuf_len+=inl;

 		return(num+inl);

 		}

 	/* else */

 	/* stuff already in buffer, so add to it first, then flush */

 	if (ctx->obuf_len != 0)

 		{

 		if (i > 0) /* lets fill it up if we can */

 			{

 			memcpy(&(ctx->obuf[ctx->obuf_len]),in,i);

 			in+=i;

 			inl-=i;

 			num+=i;

 			ctx->obuf_len+=i;

 			}

 		/* we now have a full buffer needing flushing */

 		for (;;)

 			{

 			i=BIO_write(b->next_bio,&(ctx->obuf[ctx->obuf_off]),

 				ctx->obuf_len);

 			if (i <= 0)

 				{

 				BIO_copy_next_retry(b);

 				if (i < 0) return((num > 0)?num:i);

 				if (i == 0) return(num);

 				}

 			ctx->obuf_off+=i;

 			ctx->obuf_len-=i;

 			if (ctx->obuf_len == 0) break;

 			}

 		}

 	/* we only get here if the buffer has been flushed and we

 	 * still have stuff to write */

 	ctx->obuf_off=0;

 	/* we now have inl bytes to write */

 	while (inl >= ctx->obuf_size)

 		{

 		i=BIO_write(b->next_bio,in,inl);

 		if (i <= 0)

 			{

 			BIO_copy_next_retry(b);

 			if (i < 0) return((num > 0)?num:i);

 			if (i == 0) return(num);

 			}

 		num+=i;

 		in+=i;

 		inl-=i;

 		if (inl == 0) return(num);

 		}

 	/* copy the rest into the buffer since we have only a small 

 	 * amount left */

 	goto start;

 	}

 static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr)

 	{

 	BIO *dbio;

 	BIO_F_BUFFER_CTX *ctx;

 	long ret=1;

 	char *p1,*p2;

 	int r,i,*ip;

 	int ibs,obs;

 	ctx=(BIO_F_BUFFER_CTX *)b->ptr;

 	switch (cmd)

 		{

 	case BIO_CTRL_RESET:

 		ctx->ibuf_off=0;

 		ctx->ibuf_len=0;

 		ctx->obuf_off=0;

 		ctx->obuf_len=0;

 		if (b->next_bio == NULL) return(0);

 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);

 		break;

 	case BIO_CTRL_INFO:

 		ret=(long)ctx->obuf_len;

 		break;

 	case BIO_C_GET_BUFF_NUM_LINES:

 		ret=0;

 		p1=ctx->ibuf;

 		for (i=ctx->ibuf_off; i<ctx->ibuf_len; i++)

 			{

 			if (p1[i] == '\n') ret++;

 			}

 		break;

 	case BIO_CTRL_WPENDING:

 		ret=(long)ctx->obuf_len;

 		if (ret == 0)

 			{

 			if (b->next_bio == NULL) return(0);

 			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);

 			}

 		break;

 	case BIO_CTRL_PENDING:

 		ret=(long)ctx->ibuf_len;

 		if (ret == 0)

 			{

 			if (b->next_bio == NULL) return(0);

 			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);

 			}

 		break;

 	case BIO_C_SET_BUFF_READ_DATA:

 		if (num > ctx->ibuf_size)

 			{

 			p1=OPENSSL_malloc((int)num);

 			if (p1 == NULL) goto malloc_error;

 			if (ctx->ibuf != NULL) OPENSSL_free(ctx->ibuf);

 			ctx->ibuf=p1;

 			}

 		ctx->ibuf_off=0;

 		ctx->ibuf_len=(int)num;

 		memcpy(ctx->ibuf,ptr,(int)num);

 		ret=1;

 		break;

 	case BIO_C_SET_BUFF_SIZE:

 		if (ptr != NULL)

 			{

 			ip=(int *)ptr;

 			if (*ip == 0)

 				{

 				ibs=(int)num;

 				obs=ctx->obuf_size;

 				}

 			else /* if (*ip == 1) */

 				{

 				ibs=ctx->ibuf_size;

 				obs=(int)num;

 				}

 			}

 		else

 			{

 			ibs=(int)num;

 			obs=(int)num;

 			}

 		p1=ctx->ibuf;

 		p2=ctx->obuf;

 		if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size))

 			{

 			p1=(char *)OPENSSL_malloc((int)num);

 			if (p1 == NULL) goto malloc_error;

 			}

 		if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size))

 			{

 			p2=(char *)OPENSSL_malloc((int)num);

 			if (p2 == NULL)

 				{

 				if (p1 != ctx->ibuf) OPENSSL_free(p1);

 				goto malloc_error;

 				}

 			}

 		if (ctx->ibuf != p1)

 			{

 			OPENSSL_free(ctx->ibuf);

 			ctx->ibuf=p1;

 			ctx->ibuf_off=0;

 			ctx->ibuf_len=0;

 			ctx->ibuf_size=ibs;

 			}

 		if (ctx->obuf != p2)

 			{

 			OPENSSL_free(ctx->obuf);

 			ctx->obuf=p2;

 			ctx->obuf_off=0;

 			ctx->obuf_len=0;

 			ctx->obuf_size=obs;

 			}

 		break;

 	case BIO_C_DO_STATE_MACHINE:

 		if (b->next_bio == NULL) return(0);

 		BIO_clear_retry_flags(b);

 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);

 		BIO_copy_next_retry(b);

 		break;

 	case BIO_CTRL_FLUSH:

 		if (b->next_bio == NULL) return(0);

 		if (ctx->obuf_len <= 0)

 			{

 			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);

 			break;

 			}

 		for (;;)

 			{

 			BIO_clear_retry_flags(b);

 			if (ctx->obuf_len > ctx->obuf_off)

 				{

 				r=BIO_write(b->next_bio,

 					&(ctx->obuf[ctx->obuf_off]),

 					ctx->obuf_len-ctx->obuf_off);

 #if 0

 fprintf(stderr,"FLUSH [%3d] %3d -> %3d\n",ctx->obuf_off,ctx->obuf_len-ctx->obuf_off,r);

 #endif

 				BIO_copy_next_retry(b);

 				if (r <= 0) return((long)r);

 				ctx->obuf_off+=r;

 				}

 			else

 				{

 				ctx->obuf_len=0;

 				ctx->obuf_off=0;

 				ret=1;

 				break;

 				}

 			}

 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);

 		break;

 	case BIO_CTRL_DUP:

 		dbio=(BIO *)ptr;

 		if (	!BIO_set_read_buffer_size(dbio,ctx->ibuf_size) ||

 			!BIO_set_write_buffer_size(dbio,ctx->obuf_size))

 			ret=0;

 		break;

 	default:

 		if (b->next_bio == NULL) return(0);

 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);

 		break;

 		}

 	return(ret);

 malloc_error:

 	BIOerr(BIO_F_BUFFER_CTRL,ERR_R_MALLOC_FAILURE);

 	return(0);

 	}

 static long buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)

 	{

 	long ret=1;

 	if (b->next_bio == NULL) return(0);

 	switch (cmd)

 		{

 	default:

 		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);

 		break;

 		}

 	return(ret);

 	}

 static int buffer_gets(BIO *b, char *buf, int size)

 	{

 	BIO_F_BUFFER_CTX *ctx;

 	int num=0,i,flag;

 	char *p;

 	ctx=(BIO_F_BUFFER_CTX *)b->ptr;

 	size--; /* reserve space for a '\0' */

 	BIO_clear_retry_flags(b);

 	for (;;)

 		{

 		if (ctx->ibuf_len > 0)

 			{

 			p= &(ctx->ibuf[ctx->ibuf_off]);

 			flag=0;

 			for (i=0; (i<ctx->ibuf_len) && (i<size); i++)

 				{

 				*(buf++)=p[i];

 				if (p[i] == '\n')

 					{

 					flag=1;

 					i++;

 					break;

 					}

 				}

 			num+=i;

 			size-=i;

 			ctx->ibuf_len-=i;

 			ctx->ibuf_off+=i;

 			if (flag || size == 0)

 				{

 				*buf='\0';

 				return(num);

 				}

 			}

 		else	/* read another chunk */

 			{

 			i=BIO_read(b->next_bio,ctx->ibuf,ctx->ibuf_size);

 			if (i <= 0)

 				{

 				BIO_copy_next_retry(b);

 				*buf='\0';

 				if (i < 0) return((num > 0)?num:i);

 				if (i == 0) return(num);

 				}

 			ctx->ibuf_len=i;

 			ctx->ibuf_off=0;

 			}

 		}

 	}

 static int buffer_puts(BIO *b, const char *str)

 	{

 	return(buffer_write(b,str,strlen(str)));

 	}