/* 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>

 #include <openssl/evp.h>

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

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

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

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

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

 static int linebuffer_new(BIO *h);

 static int linebuffer_free(BIO *data);

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

 /* A 10k maximum should be enough for most purposes */

 #define DEFAULT_LINEBUFFER_SIZE	1024*10

 /* #define DEBUG */

 static BIO_METHOD methods_linebuffer=

 	{

 	BIO_TYPE_LINEBUFFER,

 	"linebuffer",

 	linebuffer_write,

 	linebuffer_read,

 	linebuffer_puts,

 	linebuffer_gets,

 	linebuffer_ctrl,

 	linebuffer_new,

 	linebuffer_free,

 	linebuffer_callback_ctrl,

 	};

 BIO_METHOD *BIO_f_linebuffer(void)

 	{

 	return(&methods_linebuffer);

 	}

 typedef struct bio_linebuffer_ctx_struct

 	{

 	char *obuf;		/* the output char array */

 	int obuf_size;		/* how big is the output buffer */

 	int obuf_len;		/* how many bytes are in it */

 	} BIO_LINEBUFFER_CTX;

 static int linebuffer_new(BIO *bi)

 	{

 	BIO_LINEBUFFER_CTX *ctx;

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

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

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

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

 	ctx->obuf_size=DEFAULT_LINEBUFFER_SIZE;

 	ctx->obuf_len=0;

 	bi->init=1;

 	bi->ptr=(char *)ctx;

 	bi->flags=0;

 	return(1);

 	}

 static int linebuffer_free(BIO *a)

 	{

 	BIO_LINEBUFFER_CTX *b;

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

 	b=(BIO_LINEBUFFER_CTX *)a->ptr;

 	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 linebuffer_read(BIO *b, char *out, int outl)

 	{

 	int ret=0;

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

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

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

 	BIO_clear_retry_flags(b);

 	BIO_copy_next_retry(b);

 	return(ret);

 	}

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

 	{

 	int i,num=0,foundnl;

 	BIO_LINEBUFFER_CTX *ctx;

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

 	ctx=(BIO_LINEBUFFER_CTX *)b->ptr;

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

 	BIO_clear_retry_flags(b);

 	do

 		{

 		const char *p;

 		for(p = in; p < in + inl && *p != '\n'; p++)

 			;

 		if (*p == '\n')

 			{

 			p++;

 			foundnl = 1;

 			}

 		else

 			foundnl = 0;

 		/* If a NL was found and we already have text in the save

 		   buffer, concatenate them and write */

 		while ((foundnl || p - in > ctx->obuf_size - ctx->obuf_len)

 			&& ctx->obuf_len > 0)

 			{

 			int orig_olen = ctx->obuf_len;

 			i = ctx->obuf_size - ctx->obuf_len;

 			if (p - in > 0)

 				{

 				if (i >= p - in)

 					{

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

 						in,p - in);

 					ctx->obuf_len += p - in;

 					inl -= p - in;

 					num += p - in;

 					in = p;

 					}

 				else

 					{

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

 						in,i);

 					ctx->obuf_len += i;

 					inl -= i;

 					in += i;

 					num += i;

 					}

 				}

 #if 0

 BIO_write(b->next_bio, "<*<", 3);

 #endif

 			i=BIO_write(b->next_bio,

 				ctx->obuf, ctx->obuf_len);

 			if (i <= 0)

 				{

 				ctx->obuf_len = orig_olen;

 				BIO_copy_next_retry(b);

 #if 0

 BIO_write(b->next_bio, ">*>", 3);

 #endif

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

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

 				}

 #if 0

 BIO_write(b->next_bio, ">*>", 3);

 #endif

 			if (i < ctx->obuf_len)

 				memmove(ctx->obuf, ctx->obuf + i,

 					ctx->obuf_len - i);

 			ctx->obuf_len-=i;

 			}

 		/* Now that the save buffer is emptied, let's write the input

 		   buffer if a NL was found and there is anything to write. */

 		if ((foundnl || p - in > ctx->obuf_size) && p - in > 0)

 			{

 #if 0

 BIO_write(b->next_bio, "<*<", 3);

 #endif

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

 			if (i <= 0)

 				{

 				BIO_copy_next_retry(b);

 #if 0

 BIO_write(b->next_bio, ">*>", 3);

 #endif

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

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

 				}

 #if 0

 BIO_write(b->next_bio, ">*>", 3);

 #endif

 			num+=i;

 			in+=i;

 			inl-=i;

 			}

 		}

 	while(foundnl && inl > 0);

 	/* We've written as much as we can.  The rest of the input buffer, if

 	   any, is text that doesn't and with a NL and therefore needs to be

 	   saved for the next trip. */

 	if (inl > 0)

 		{

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

 		ctx->obuf_len += inl;

 		num += inl;

 		}

 	return num;

 	}

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

 	{

 	BIO *dbio;

 	BIO_LINEBUFFER_CTX *ctx;

 	long ret=1;

 	char *p;

 	int r;

 	int obs;

 	ctx=(BIO_LINEBUFFER_CTX *)b->ptr;

 	switch (cmd)

 		{

 	case BIO_CTRL_RESET:

 		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_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_C_SET_BUFF_SIZE:

 		obs=(int)num;

 		p=ctx->obuf;

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

 			{

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

 			if (p == NULL)

 				goto malloc_error;

 			}

 		if (ctx->obuf != p)

 			{

 			if (ctx->obuf_len > obs)

 				{

 				ctx->obuf_len = obs;

 				}

 			memcpy(p, ctx->obuf, ctx->obuf_len);

 			OPENSSL_free(ctx->obuf);

 			ctx->obuf=p;

 			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 > 0)

 				{

 				r=BIO_write(b->next_bio,

 					ctx->obuf, ctx->obuf_len);

 #if 0

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

 #endif

 				BIO_copy_next_retry(b);

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

 				if (r < ctx->obuf_len)

 					memmove(ctx->obuf, ctx->obuf + r,

 						ctx->obuf_len - r);

 				ctx->obuf_len-=r;

 				}

 			else

 				{

 				ctx->obuf_len=0;

 				ret=1;

 				break;

 				}

 			}

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

 		break;

 	case BIO_CTRL_DUP:

 		dbio=(BIO *)ptr;

 		if (	!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_LINEBUFFER_CTRL,ERR_R_MALLOC_FAILURE);

 	return(0);

 	}

 static long linebuffer_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 linebuffer_gets(BIO *b, char *buf, int size)

 	{

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

 	return(BIO_gets(b->next_bio,buf,size));

 	}

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

 	{

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

 	}