/* 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);

	}