/* crypto/bio/bss_mem.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.]

  */

 /*

  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

  */

 #include <stdio.h>

 #include <errno.h>

 #include "cryptlib.h"

 #include <openssl/bio.h>

 #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

 #include "libcrypto_wsd_macros.h"

 #include "libcrypto_wsd.h"

 #endif

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

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

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

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

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

 static int mem_new(BIO *h);

 static int mem_free(BIO *data);

 #ifndef EMULATOR

 static BIO_METHOD mem_method=

 	{

 	BIO_TYPE_MEM,

 	"memory buffer",

 	mem_write,

 	mem_read,

 	mem_puts,

 	mem_gets,

 	mem_ctrl,

 	mem_new,

 	mem_free,

 	NULL,

 	};

 #else

 GET_STATIC_VAR_FROM_TLS(mem_method,bss_mem,BIO_METHOD)

 #define mem_method (*GET_WSD_VAR_NAME(mem_method,bss_mem,s)())

 const BIO_METHOD temp_s_mem_method=

 	{

 	BIO_TYPE_MEM,

 	"memory buffer",

 	mem_write,

 	mem_read,

 	mem_puts,

 	mem_gets,

 	mem_ctrl,

 	mem_new,

 	mem_free,

 	NULL,

 	};

 #endif

 /* bio->num is used to hold the value to return on 'empty', if it is

  * 0, should_retry is not set */

 EXPORT_C BIO_METHOD *BIO_s_mem(void)

 	{

 	return(&mem_method);

 	}

 EXPORT_C BIO *BIO_new_mem_buf(void *buf, int len)

 {

 	BIO *ret;

 	BUF_MEM *b;

 	if (!buf) {

 		BIOerr(BIO_F_BIO_NEW_MEM_BUF,BIO_R_NULL_PARAMETER);

 		return NULL;

 	}

 	if(len == -1) len = strlen(buf);

 	if(!(ret = BIO_new(BIO_s_mem())) ) return NULL;

 	b = (BUF_MEM *)ret->ptr;

 	b->data = buf;

 	b->length = len;

 	b->max = len;

 	ret->flags |= BIO_FLAGS_MEM_RDONLY;

 	/* Since this is static data retrying wont help */

 	ret->num = 0;

 	return ret;

 }

 static int mem_new(BIO *bi)

 	{

 	BUF_MEM *b;

 	if ((b=BUF_MEM_new()) == NULL)

 		return(0);

 	bi->shutdown=1;

 	bi->init=1;

 	bi->num= -1;

 	bi->ptr=(char *)b;

 	return(1);

 	}

 static int mem_free(BIO *a)

 	{

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

 	if (a->shutdown)

 		{

 		if ((a->init) && (a->ptr != NULL))

 			{

 			BUF_MEM *b;

 			b = (BUF_MEM *)a->ptr;

 			if(a->flags & BIO_FLAGS_MEM_RDONLY) b->data = NULL;

 			BUF_MEM_free(b);

 			a->ptr=NULL;

 			}

 		}

 	return(1);

 	}

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

 	{

 	int ret= -1;

 	BUF_MEM *bm;

 	int i;

 	char *from,*to;

 	bm=(BUF_MEM *)b->ptr;

 	BIO_clear_retry_flags(b);

 	ret=(outl > bm->length)?bm->length:outl;

 	if ((out != NULL) && (ret > 0)) {

 		memcpy(out,bm->data,ret);

 		bm->length-=ret;

 		/* memmove(&(bm->data[0]),&(bm->data[ret]), bm->length); */

 		if(b->flags & BIO_FLAGS_MEM_RDONLY) bm->data += ret;

 		else {

 			from=(char *)&(bm->data[ret]);

 			to=(char *)&(bm->data[0]);

 			for (i=0; i<bm->length; i++)

 				to[i]=from[i];

 		}

 	} else if (bm->length == 0)

 		{

 		ret = b->num;

 		if (ret != 0)

 			BIO_set_retry_read(b);

 		}

 	return(ret);

 	}

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

 	{

 	int ret= -1;

 	int blen;

 	BUF_MEM *bm;

 	bm=(BUF_MEM *)b->ptr;

 	if (in == NULL)

 		{

 		BIOerr(BIO_F_MEM_WRITE,BIO_R_NULL_PARAMETER);

 		goto end;

 		}

 	if(b->flags & BIO_FLAGS_MEM_RDONLY) {

 		BIOerr(BIO_F_MEM_WRITE,BIO_R_WRITE_TO_READ_ONLY_BIO);

 		goto end;

 	}

 	BIO_clear_retry_flags(b);

 	blen=bm->length;

 	if (BUF_MEM_grow_clean(bm,blen+inl) != (blen+inl))

 		goto end;

 	memcpy(&(bm->data[blen]),in,inl);

 	ret=inl;

 end:

 	return(ret);

 	}

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

 	{

 	long ret=1;

 	char **pptr;

 	BUF_MEM *bm=(BUF_MEM *)b->ptr;

 	switch (cmd)

 		{

 	case BIO_CTRL_RESET:

 		if (bm->data != NULL)

 			{

 			/* For read only case reset to the start again */

 			if(b->flags & BIO_FLAGS_MEM_RDONLY) 

 				{

 				bm->data -= bm->max - bm->length;

 				bm->length = bm->max;

 				}

 			else

 				{

 				memset(bm->data,0,bm->max);

 				bm->length=0;

 				}

 			}

 		break;

 	case BIO_CTRL_EOF:

 		ret=(long)(bm->length == 0);

 		break;

 	case BIO_C_SET_BUF_MEM_EOF_RETURN:

 		b->num=(int)num;

 		break;

 	case BIO_CTRL_INFO:

 		ret=(long)bm->length;

 		if (ptr != NULL)

 			{

 			pptr=(char **)ptr;

 			*pptr=(char *)&(bm->data[0]);

 			}

 		break;

 	case BIO_C_SET_BUF_MEM:

 		mem_free(b);

 		b->shutdown=(int)num;

 		b->ptr=ptr;

 		break;

 	case BIO_C_GET_BUF_MEM_PTR:

 		if (ptr != NULL)

 			{

 			pptr=(char **)ptr;

 			*pptr=(char *)bm;

 			}

 		break;

 	case BIO_CTRL_GET_CLOSE:

 		ret=(long)b->shutdown;

 		break;

 	case BIO_CTRL_SET_CLOSE:

 		b->shutdown=(int)num;

 		break;

 	case BIO_CTRL_WPENDING:

 		ret=0L;

 		break;

 	case BIO_CTRL_PENDING:

 		ret=(long)bm->length;

 		break;

 	case BIO_CTRL_DUP:

 	case BIO_CTRL_FLUSH:

 		ret=1;

 		break;

 	case BIO_CTRL_PUSH:

 	case BIO_CTRL_POP:

 	default:

 		ret=0;

 		break;

 		}

 	return(ret);

 	}

 static int mem_gets(BIO *bp, char *buf, int size)

 	{

 	int i,j;

 	int ret= -1;

 	char *p;

 	BUF_MEM *bm=(BUF_MEM *)bp->ptr;

 	BIO_clear_retry_flags(bp);

 	j=bm->length;

 	if (j <= 0)

 		{

 		*buf='\0';

 		return 0;

 		}

 	p=bm->data;

 	for (i=0; i<j; i++)

 		{

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

 		}

 	if (i == j)

 		{

 		BIO_set_retry_read(bp);

 		/* return(-1);  change the semantics 0.6.6a */ 

 		}

 	else

 		i++;

 	/* i is the max to copy */

 	if ((size-1) < i) i=size-1;

 	i=mem_read(bp,buf,i);

 	if (i > 0) buf[i]='\0';

 	ret=i;

 	return(ret);

 	}

 static int mem_puts(BIO *bp, const char *str)

 	{

 	int n,ret;

 	n=strlen(str);

 	ret=mem_write(bp,str,n);

 	/* memory semantics is that it will always work */

 	return(ret);

 	}