/* crypto/evp/bio_b64.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/buffer.h>

 #include <openssl/evp.h>

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

 #include "libcrypto_wsd_macros.h"

 #include "libcrypto_wsd.h"

 #endif

 static int b64_write(BIO *h, const char *buf, int num);

 static int b64_read(BIO *h, char *buf, int size);

 /*static int b64_puts(BIO *h, const char *str); */

 /*static int b64_gets(BIO *h, char *str, int size); */

 static long b64_ctrl(BIO *h, int cmd, long arg1, void *arg2);

 static int b64_new(BIO *h);

 static int b64_free(BIO *data);

 static long b64_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp);

 #define B64_BLOCK_SIZE	1024

 #define B64_BLOCK_SIZE2	768

 #define B64_NONE	0

 #define B64_ENCODE	1

 #define B64_DECODE	2

 typedef struct b64_struct

 	{

 	/*BIO *bio; moved to the BIO structure */

 	int buf_len;

 	int buf_off;

 	int tmp_len;		/* used to find the start when decoding */

 	int tmp_nl;		/* If true, scan until '\n' */

 	int encode;

 	int start;		/* have we started decoding yet? */

 	int cont;		/* <= 0 when finished */

 	EVP_ENCODE_CTX base64;

 	char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE)+10];

 	char tmp[B64_BLOCK_SIZE];

 	} BIO_B64_CTX;

 #ifndef EMULATOR

 static BIO_METHOD methods_b64=

 	{

 	BIO_TYPE_BASE64,"base64 encoding",

 	b64_write,

 	b64_read,

 	NULL, /* b64_puts, */

 	NULL, /* b64_gets, */

 	b64_ctrl,

 	b64_new,

 	b64_free,

 	b64_callback_ctrl,

 	};

 #else

 GET_STATIC_VAR_FROM_TLS(methods_b64,bio_b64,BIO_METHOD)

 #define methods_b64 (*GET_WSD_VAR_NAME(methods_b64,bio_b64, s)())

 const BIO_METHOD temp_s_methods_b64=

 	{

 	BIO_TYPE_BASE64,"base64 encoding",

 	b64_write,

 	b64_read,

 	NULL, /* b64_puts, */

 	NULL, /* b64_gets, */

 	b64_ctrl,

 	b64_new,

 	b64_free,

 	b64_callback_ctrl,

 	};

 #endif

 EXPORT_C BIO_METHOD *BIO_f_base64(void)

 	{

 	return(&methods_b64);

 	}

 static int b64_new(BIO *bi)

 	{

 	BIO_B64_CTX *ctx;

 	ctx=(BIO_B64_CTX *)OPENSSL_malloc(sizeof(BIO_B64_CTX));

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

 	ctx->buf_len=0;

 	ctx->tmp_len=0;

 	ctx->tmp_nl=0;

 	ctx->buf_off=0;

 	ctx->cont=1;

 	ctx->start=1;

 	ctx->encode=0;

 	bi->init=1;

 	bi->ptr=(char *)ctx;

 	bi->flags=0;

 	return(1);

 	}

 static int b64_free(BIO *a)

 	{

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

 	OPENSSL_free(a->ptr);

 	a->ptr=NULL;

 	a->init=0;

 	a->flags=0;

 	return(1);

 	}

 static int b64_read(BIO *b, char *out, int outl)

 	{

 	int ret=0,i,ii,j,k,x,n,num,ret_code=0;

 	BIO_B64_CTX *ctx;

 	unsigned char *p,*q;

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

 	ctx=(BIO_B64_CTX *)b->ptr;

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

 	if (ctx->encode != B64_DECODE)

 		{

 		ctx->encode=B64_DECODE;

 		ctx->buf_len=0;

 		ctx->buf_off=0;

 		ctx->tmp_len=0;

 		EVP_DecodeInit(&(ctx->base64));

 		}

 	/* First check if there are bytes decoded/encoded */

 	if (ctx->buf_len > 0)

 		{

 		i=ctx->buf_len-ctx->buf_off;

 		if (i > outl) i=outl;

 		OPENSSL_assert(ctx->buf_off+i < (int)sizeof(ctx->buf));

 		memcpy(out,&(ctx->buf[ctx->buf_off]),i);

 		ret=i;

 		out+=i;

 		outl-=i;

 		ctx->buf_off+=i;

 		if (ctx->buf_len == ctx->buf_off)

 			{

 			ctx->buf_len=0;

 			ctx->buf_off=0;

 			}

 		}

 	/* At this point, we have room of outl bytes and an empty

 	 * buffer, so we should read in some more. */

 	ret_code=0;

 	while (outl > 0)

 		{

 		if (ctx->cont <= 0)

 			break;

 		i=BIO_read(b->next_bio,&(ctx->tmp[ctx->tmp_len]),

 			B64_BLOCK_SIZE-ctx->tmp_len);

 		if (i <= 0)

 			{

 			ret_code=i;

 			/* Should be continue next time we are called? */

 			if (!BIO_should_retry(b->next_bio))

 				{

 				ctx->cont=i;

 				/* If buffer empty break */

 				if(ctx->tmp_len == 0)

 					break;

 				/* Fall through and process what we have */

 				else

 					i = 0;

 				}

 			/* else we retry and add more data to buffer */

 			else

 				break;

 			}

 		i+=ctx->tmp_len;

 		ctx->tmp_len = i;

 		/* We need to scan, a line at a time until we

 		 * have a valid line if we are starting. */

 		if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL))

 			{

 			/* ctx->start=1; */

 			ctx->tmp_len=0;

 			}

 		else if (ctx->start)

 			{

 			q=p=(unsigned char *)ctx->tmp;

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

 				{

 				if (*(q++) != '\n') continue;

 				/* due to a previous very long line,

 				 * we need to keep on scanning for a '\n'

 				 * before we even start looking for

 				 * base64 encoded stuff. */

 				if (ctx->tmp_nl)

 					{

 					p=q;

 					ctx->tmp_nl=0;

 					continue;

 					}

 				k=EVP_DecodeUpdate(&(ctx->base64),

 					(unsigned char *)ctx->buf,

 					&num,p,q-p);

 				if ((k <= 0) && (num == 0) && (ctx->start))

 					EVP_DecodeInit(&ctx->base64);

 				else 

 					{

 					if (p != (unsigned char *)

 						&(ctx->tmp[0]))

 						{

 						i-=(p- (unsigned char *)

 							&(ctx->tmp[0]));

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

 							ctx->tmp[x]=p[x];

 						}

 					EVP_DecodeInit(&ctx->base64);

 					ctx->start=0;

 					break;

 					}

 				p=q;

 				}

 			/* we fell off the end without starting */

 			if (j == i)

 				{

 				/* Is this is one long chunk?, if so, keep on

 				 * reading until a new line. */

 				if (p == (unsigned char *)&(ctx->tmp[0]))

 					{

 					/* Check buffer full */

 					if (i == B64_BLOCK_SIZE)

 						{

 						ctx->tmp_nl=1;

 						ctx->tmp_len=0;

 						}

 					}

 				else if (p != q) /* finished on a '\n' */

 					{

 					n=q-p;

 					for (ii=0; ii<n; ii++)

 						ctx->tmp[ii]=p[ii];

 					ctx->tmp_len=n;

 					}

 				/* else finished on a '\n' */

 				continue;

 				}

 			else

 				ctx->tmp_len=0;

 			}

 		/* If buffer isn't full and we can retry then

 		 * restart to read in more data.

 		 */

 		else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0))

 			continue;

 		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)

 			{

 			int z,jj;

 			jj=(i>>2)<<2;

 			z=EVP_DecodeBlock((unsigned char *)ctx->buf,

 				(unsigned char *)ctx->tmp,jj);

 			if (jj > 2)

 				{

 				if (ctx->tmp[jj-1] == '=')

 					{

 					z--;

 					if (ctx->tmp[jj-2] == '=')

 						z--;

 					}

 				}

 			/* z is now number of output bytes and jj is the

 			 * number consumed */

 			if (jj != i)

 				{

 				memcpy((unsigned char *)ctx->tmp,

 					(unsigned char *)&(ctx->tmp[jj]),i-jj);

 				ctx->tmp_len=i-jj;

 				}

 			ctx->buf_len=0;

 			if (z > 0)

 				{

 				ctx->buf_len=z;

 				i=1;

 				}

 			else

 				i=z;

 			}

 		else

 			{

 			i=EVP_DecodeUpdate(&(ctx->base64),

 				(unsigned char *)ctx->buf,&ctx->buf_len,

 				(unsigned char *)ctx->tmp,i);

 			ctx->tmp_len = 0;

 			}

 		ctx->buf_off=0;

 		if (i < 0)

 			{

 			ret_code=0;

 			ctx->buf_len=0;

 			break;

 			}

 		if (ctx->buf_len <= outl)

 			i=ctx->buf_len;

 		else

 			i=outl;

 		memcpy(out,ctx->buf,i);

 		ret+=i;

 		ctx->buf_off=i;

 		if (ctx->buf_off == ctx->buf_len)

 			{

 			ctx->buf_len=0;

 			ctx->buf_off=0;

 			}

 		outl-=i;

 		out+=i;

 		}

 	BIO_clear_retry_flags(b);

 	BIO_copy_next_retry(b);

 	return((ret == 0)?ret_code:ret);

 	}

 static int b64_write(BIO *b, const char *in, int inl)

 	{

 	int ret=inl,n,i;

 	BIO_B64_CTX *ctx;

 	ctx=(BIO_B64_CTX *)b->ptr;

 	BIO_clear_retry_flags(b);

 	if (ctx->encode != B64_ENCODE)

 		{

 		ctx->encode=B64_ENCODE;

 		ctx->buf_len=0;

 		ctx->buf_off=0;

 		ctx->tmp_len=0;

 		EVP_EncodeInit(&(ctx->base64));

 		}

 	n=ctx->buf_len-ctx->buf_off;

 	while (n > 0)

 		{

 		i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);

 		if (i <= 0)

 			{

 			BIO_copy_next_retry(b);

 			return(i);

 			}

 		ctx->buf_off+=i;

 		n-=i;

 		}

 	/* at this point all pending data has been written */

 	ctx->buf_off=0;

 	ctx->buf_len=0;

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

 	while (inl > 0)

 		{

 		n=(inl > B64_BLOCK_SIZE)?B64_BLOCK_SIZE:inl;

 		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)

 			{

 			if (ctx->tmp_len > 0)

 				{

 				n=3-ctx->tmp_len;

 				/* There's a teoretical possibility for this */

 				if (n > inl) 

 					n=inl;

 				memcpy(&(ctx->tmp[ctx->tmp_len]),in,n);

 				ctx->tmp_len+=n;

 				if (ctx->tmp_len < 3)

 					break;

 				ctx->buf_len=EVP_EncodeBlock(

 					(unsigned char *)ctx->buf,

 					(unsigned char *)ctx->tmp,

 					ctx->tmp_len);

 				/* Since we're now done using the temporary

 				   buffer, the length should be 0'd */

 				ctx->tmp_len=0;

 				}

 			else

 				{

 				if (n < 3)

 					{

 					memcpy(&(ctx->tmp[0]),in,n);

 					ctx->tmp_len=n;

 					break;

 					}

 				n-=n%3;

 				ctx->buf_len=EVP_EncodeBlock(

 					(unsigned char *)ctx->buf,

 					(unsigned char *)in,n);

 				}

 			}

 		else

 			{

 			EVP_EncodeUpdate(&(ctx->base64),

 				(unsigned char *)ctx->buf,&ctx->buf_len,

 				(unsigned char *)in,n);

 			}

 		inl-=n;

 		in+=n;

 		ctx->buf_off=0;

 		n=ctx->buf_len;

 		while (n > 0)

 			{

 			i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);

 			if (i <= 0)

 				{

 				BIO_copy_next_retry(b);

 				return((ret == 0)?i:ret);

 				}

 			n-=i;

 			ctx->buf_off+=i;

 			}

 		ctx->buf_len=0;

 		ctx->buf_off=0;

 		}

 	return(ret);

 	}

 static long b64_ctrl(BIO *b, int cmd, long num, void *ptr)

 	{

 	BIO_B64_CTX *ctx;

 	long ret=1;

 	int i;

 	ctx=(BIO_B64_CTX *)b->ptr;

 	switch (cmd)

 		{

 	case BIO_CTRL_RESET:

 		ctx->cont=1;

 		ctx->start=1;

 		ctx->encode=B64_NONE;

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

 		break;

 	case BIO_CTRL_EOF:	/* More to read */

 		if (ctx->cont <= 0)

 			ret=1;

 		else

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

 		break;

 	case BIO_CTRL_WPENDING: /* More to write in buffer */

 		ret=ctx->buf_len-ctx->buf_off;

 		if ((ret == 0) && (ctx->encode != B64_NONE)

 			&& (ctx->base64.num != 0))

 			ret=1;

 		else if (ret <= 0)

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

 		break;

 	case BIO_CTRL_PENDING: /* More to read in buffer */

 		ret=ctx->buf_len-ctx->buf_off;

 		if (ret <= 0)

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

 		break;

 	case BIO_CTRL_FLUSH:

 		/* do a final write */

 again:

 		while (ctx->buf_len != ctx->buf_off)

 			{

 			i=b64_write(b,NULL,0);

 			if (i < 0)

 				return i;

 			}

 		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)

 			{

 			if (ctx->tmp_len != 0)

 				{

 				ctx->buf_len=EVP_EncodeBlock(

 					(unsigned char *)ctx->buf,

 					(unsigned char *)ctx->tmp,

 					ctx->tmp_len);

 				ctx->buf_off=0;

 				ctx->tmp_len=0;

 				goto again;

 				}

 			}

 		else if (ctx->encode != B64_NONE && ctx->base64.num != 0)

 			{

 			ctx->buf_off=0;

 			EVP_EncodeFinal(&(ctx->base64),

 				(unsigned char *)ctx->buf,

 				&(ctx->buf_len));

 			/* push out the bytes */

 			goto again;

 			}

 		/* Finally flush the underlying BIO */

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

 		break;

 	case BIO_C_DO_STATE_MACHINE:

 		BIO_clear_retry_flags(b);

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

 		BIO_copy_next_retry(b);

 		break;

 	case BIO_CTRL_DUP:

 		break;

 	case BIO_CTRL_INFO:

 	case BIO_CTRL_GET:

 	case BIO_CTRL_SET:

 	default:

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

 		break;

 		}

 	return(ret);

 	}

 static long b64_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);

 	}