sl@0: /* crypto/evp/bio_b64.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0:  
sl@0: /*
sl@0:  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
sl@0:  */
sl@0: 
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include <errno.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/buffer.h>
sl@0: #include <openssl/evp.h>
sl@0: #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))
sl@0: #include "libcrypto_wsd_macros.h"
sl@0: #include "libcrypto_wsd.h"
sl@0: #endif
sl@0: 
sl@0: static int b64_write(BIO *h, const char *buf, int num);
sl@0: static int b64_read(BIO *h, char *buf, int size);
sl@0: /*static int b64_puts(BIO *h, const char *str); */
sl@0: /*static int b64_gets(BIO *h, char *str, int size); */
sl@0: static long b64_ctrl(BIO *h, int cmd, long arg1, void *arg2);
sl@0: static int b64_new(BIO *h);
sl@0: static int b64_free(BIO *data);
sl@0: static long b64_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp);
sl@0: #define B64_BLOCK_SIZE	1024
sl@0: #define B64_BLOCK_SIZE2	768
sl@0: #define B64_NONE	0
sl@0: #define B64_ENCODE	1
sl@0: #define B64_DECODE	2
sl@0: 
sl@0: typedef struct b64_struct
sl@0: 	{
sl@0: 	/*BIO *bio; moved to the BIO structure */
sl@0: 	int buf_len;
sl@0: 	int buf_off;
sl@0: 	int tmp_len;		/* used to find the start when decoding */
sl@0: 	int tmp_nl;		/* If true, scan until '\n' */
sl@0: 	int encode;
sl@0: 	int start;		/* have we started decoding yet? */
sl@0: 	int cont;		/* <= 0 when finished */
sl@0: 	EVP_ENCODE_CTX base64;
sl@0: 	char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE)+10];
sl@0: 	char tmp[B64_BLOCK_SIZE];
sl@0: 	} BIO_B64_CTX;
sl@0: 
sl@0: #ifndef EMULATOR
sl@0: static BIO_METHOD methods_b64=
sl@0: 	{
sl@0: 	BIO_TYPE_BASE64,"base64 encoding",
sl@0: 	b64_write,
sl@0: 	b64_read,
sl@0: 	NULL, /* b64_puts, */
sl@0: 	NULL, /* b64_gets, */
sl@0: 	b64_ctrl,
sl@0: 	b64_new,
sl@0: 	b64_free,
sl@0: 	b64_callback_ctrl,
sl@0: 	};
sl@0: #else
sl@0: GET_STATIC_VAR_FROM_TLS(methods_b64,bio_b64,BIO_METHOD)
sl@0: #define methods_b64 (*GET_WSD_VAR_NAME(methods_b64,bio_b64, s)())
sl@0: const BIO_METHOD temp_s_methods_b64=
sl@0: 	{
sl@0: 	BIO_TYPE_BASE64,"base64 encoding",
sl@0: 	b64_write,
sl@0: 	b64_read,
sl@0: 	NULL, /* b64_puts, */
sl@0: 	NULL, /* b64_gets, */
sl@0: 	b64_ctrl,
sl@0: 	b64_new,
sl@0: 	b64_free,
sl@0: 	b64_callback_ctrl,
sl@0: 	};
sl@0: #endif
sl@0: EXPORT_C BIO_METHOD *BIO_f_base64(void)
sl@0: 	{
sl@0: 	return(&methods_b64);
sl@0: 	}
sl@0: 
sl@0: static int b64_new(BIO *bi)
sl@0: 	{
sl@0: 	BIO_B64_CTX *ctx;
sl@0: 
sl@0: 	ctx=(BIO_B64_CTX *)OPENSSL_malloc(sizeof(BIO_B64_CTX));
sl@0: 	if (ctx == NULL) return(0);
sl@0: 
sl@0: 	ctx->buf_len=0;
sl@0: 	ctx->tmp_len=0;
sl@0: 	ctx->tmp_nl=0;
sl@0: 	ctx->buf_off=0;
sl@0: 	ctx->cont=1;
sl@0: 	ctx->start=1;
sl@0: 	ctx->encode=0;
sl@0: 
sl@0: 	bi->init=1;
sl@0: 	bi->ptr=(char *)ctx;
sl@0: 	bi->flags=0;
sl@0: 	return(1);
sl@0: 	}
sl@0: 
sl@0: static int b64_free(BIO *a)
sl@0: 	{
sl@0: 	if (a == NULL) return(0);
sl@0: 	OPENSSL_free(a->ptr);
sl@0: 	a->ptr=NULL;
sl@0: 	a->init=0;
sl@0: 	a->flags=0;
sl@0: 	return(1);
sl@0: 	}
sl@0: 	
sl@0: static int b64_read(BIO *b, char *out, int outl)
sl@0: 	{
sl@0: 	int ret=0,i,ii,j,k,x,n,num,ret_code=0;
sl@0: 	BIO_B64_CTX *ctx;
sl@0: 	unsigned char *p,*q;
sl@0: 
sl@0: 	if (out == NULL) return(0);
sl@0: 	ctx=(BIO_B64_CTX *)b->ptr;
sl@0: 
sl@0: 	if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
sl@0: 
sl@0: 	if (ctx->encode != B64_DECODE)
sl@0: 		{
sl@0: 		ctx->encode=B64_DECODE;
sl@0: 		ctx->buf_len=0;
sl@0: 		ctx->buf_off=0;
sl@0: 		ctx->tmp_len=0;
sl@0: 		EVP_DecodeInit(&(ctx->base64));
sl@0: 		}
sl@0: 
sl@0: 	/* First check if there are bytes decoded/encoded */
sl@0: 	if (ctx->buf_len > 0)
sl@0: 		{
sl@0: 		i=ctx->buf_len-ctx->buf_off;
sl@0: 		if (i > outl) i=outl;
sl@0: 		OPENSSL_assert(ctx->buf_off+i < (int)sizeof(ctx->buf));
sl@0: 		memcpy(out,&(ctx->buf[ctx->buf_off]),i);
sl@0: 		ret=i;
sl@0: 		out+=i;
sl@0: 		outl-=i;
sl@0: 		ctx->buf_off+=i;
sl@0: 		if (ctx->buf_len == ctx->buf_off)
sl@0: 			{
sl@0: 			ctx->buf_len=0;
sl@0: 			ctx->buf_off=0;
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	/* At this point, we have room of outl bytes and an empty
sl@0: 	 * buffer, so we should read in some more. */
sl@0: 
sl@0: 	ret_code=0;
sl@0: 	while (outl > 0)
sl@0: 		{
sl@0: 
sl@0: 		if (ctx->cont <= 0)
sl@0: 			break;
sl@0: 
sl@0: 		i=BIO_read(b->next_bio,&(ctx->tmp[ctx->tmp_len]),
sl@0: 			B64_BLOCK_SIZE-ctx->tmp_len);
sl@0: 
sl@0: 		if (i <= 0)
sl@0: 			{
sl@0: 			ret_code=i;
sl@0: 
sl@0: 			/* Should be continue next time we are called? */
sl@0: 			if (!BIO_should_retry(b->next_bio))
sl@0: 				{
sl@0: 				ctx->cont=i;
sl@0: 				/* If buffer empty break */
sl@0: 				if(ctx->tmp_len == 0)
sl@0: 					break;
sl@0: 				/* Fall through and process what we have */
sl@0: 				else
sl@0: 					i = 0;
sl@0: 				}
sl@0: 			/* else we retry and add more data to buffer */
sl@0: 			else
sl@0: 				break;
sl@0: 			}
sl@0: 		i+=ctx->tmp_len;
sl@0: 		ctx->tmp_len = i;
sl@0: 
sl@0: 		/* We need to scan, a line at a time until we
sl@0: 		 * have a valid line if we are starting. */
sl@0: 		if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL))
sl@0: 			{
sl@0: 			/* ctx->start=1; */
sl@0: 			ctx->tmp_len=0;
sl@0: 			}
sl@0: 		else if (ctx->start)
sl@0: 			{
sl@0: 			q=p=(unsigned char *)ctx->tmp;
sl@0: 			for (j=0; j<i; j++)
sl@0: 				{
sl@0: 				if (*(q++) != '\n') continue;
sl@0: 
sl@0: 				/* due to a previous very long line,
sl@0: 				 * we need to keep on scanning for a '\n'
sl@0: 				 * before we even start looking for
sl@0: 				 * base64 encoded stuff. */
sl@0: 				if (ctx->tmp_nl)
sl@0: 					{
sl@0: 					p=q;
sl@0: 					ctx->tmp_nl=0;
sl@0: 					continue;
sl@0: 					}
sl@0: 
sl@0: 				k=EVP_DecodeUpdate(&(ctx->base64),
sl@0: 					(unsigned char *)ctx->buf,
sl@0: 					&num,p,q-p);
sl@0: 				if ((k <= 0) && (num == 0) && (ctx->start))
sl@0: 					EVP_DecodeInit(&ctx->base64);
sl@0: 				else 
sl@0: 					{
sl@0: 					if (p != (unsigned char *)
sl@0: 						&(ctx->tmp[0]))
sl@0: 						{
sl@0: 						i-=(p- (unsigned char *)
sl@0: 							&(ctx->tmp[0]));
sl@0: 						for (x=0; x < i; x++)
sl@0: 							ctx->tmp[x]=p[x];
sl@0: 						}
sl@0: 					EVP_DecodeInit(&ctx->base64);
sl@0: 					ctx->start=0;
sl@0: 					break;
sl@0: 					}
sl@0: 				p=q;
sl@0: 				}
sl@0: 
sl@0: 			/* we fell off the end without starting */
sl@0: 			if (j == i)
sl@0: 				{
sl@0: 				/* Is this is one long chunk?, if so, keep on
sl@0: 				 * reading until a new line. */
sl@0: 				if (p == (unsigned char *)&(ctx->tmp[0]))
sl@0: 					{
sl@0: 					/* Check buffer full */
sl@0: 					if (i == B64_BLOCK_SIZE)
sl@0: 						{
sl@0: 						ctx->tmp_nl=1;
sl@0: 						ctx->tmp_len=0;
sl@0: 						}
sl@0: 					}
sl@0: 				else if (p != q) /* finished on a '\n' */
sl@0: 					{
sl@0: 					n=q-p;
sl@0: 					for (ii=0; ii<n; ii++)
sl@0: 						ctx->tmp[ii]=p[ii];
sl@0: 					ctx->tmp_len=n;
sl@0: 					}
sl@0: 				/* else finished on a '\n' */
sl@0: 				continue;
sl@0: 				}
sl@0: 			else
sl@0: 				ctx->tmp_len=0;
sl@0: 			}
sl@0: 		/* If buffer isn't full and we can retry then
sl@0: 		 * restart to read in more data.
sl@0: 		 */
sl@0: 		else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0))
sl@0: 			continue;
sl@0: 
sl@0: 		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
sl@0: 			{
sl@0: 			int z,jj;
sl@0: 
sl@0: 			jj=(i>>2)<<2;
sl@0: 			z=EVP_DecodeBlock((unsigned char *)ctx->buf,
sl@0: 				(unsigned char *)ctx->tmp,jj);
sl@0: 			if (jj > 2)
sl@0: 				{
sl@0: 				if (ctx->tmp[jj-1] == '=')
sl@0: 					{
sl@0: 					z--;
sl@0: 					if (ctx->tmp[jj-2] == '=')
sl@0: 						z--;
sl@0: 					}
sl@0: 				}
sl@0: 			/* z is now number of output bytes and jj is the
sl@0: 			 * number consumed */
sl@0: 			if (jj != i)
sl@0: 				{
sl@0: 				memcpy((unsigned char *)ctx->tmp,
sl@0: 					(unsigned char *)&(ctx->tmp[jj]),i-jj);
sl@0: 				ctx->tmp_len=i-jj;
sl@0: 				}
sl@0: 			ctx->buf_len=0;
sl@0: 			if (z > 0)
sl@0: 				{
sl@0: 				ctx->buf_len=z;
sl@0: 				i=1;
sl@0: 				}
sl@0: 			else
sl@0: 				i=z;
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			i=EVP_DecodeUpdate(&(ctx->base64),
sl@0: 				(unsigned char *)ctx->buf,&ctx->buf_len,
sl@0: 				(unsigned char *)ctx->tmp,i);
sl@0: 			ctx->tmp_len = 0;
sl@0: 			}
sl@0: 		ctx->buf_off=0;
sl@0: 		if (i < 0)
sl@0: 			{
sl@0: 			ret_code=0;
sl@0: 			ctx->buf_len=0;
sl@0: 			break;
sl@0: 			}
sl@0: 
sl@0: 		if (ctx->buf_len <= outl)
sl@0: 			i=ctx->buf_len;
sl@0: 		else
sl@0: 			i=outl;
sl@0: 
sl@0: 		memcpy(out,ctx->buf,i);
sl@0: 		ret+=i;
sl@0: 		ctx->buf_off=i;
sl@0: 		if (ctx->buf_off == ctx->buf_len)
sl@0: 			{
sl@0: 			ctx->buf_len=0;
sl@0: 			ctx->buf_off=0;
sl@0: 			}
sl@0: 		outl-=i;
sl@0: 		out+=i;
sl@0: 		}
sl@0: 	BIO_clear_retry_flags(b);
sl@0: 	BIO_copy_next_retry(b);
sl@0: 	return((ret == 0)?ret_code:ret);
sl@0: 	}
sl@0: 
sl@0: static int b64_write(BIO *b, const char *in, int inl)
sl@0: 	{
sl@0: 	int ret=inl,n,i;
sl@0: 	BIO_B64_CTX *ctx;
sl@0: 
sl@0: 	ctx=(BIO_B64_CTX *)b->ptr;
sl@0: 	BIO_clear_retry_flags(b);
sl@0: 
sl@0: 	if (ctx->encode != B64_ENCODE)
sl@0: 		{
sl@0: 		ctx->encode=B64_ENCODE;
sl@0: 		ctx->buf_len=0;
sl@0: 		ctx->buf_off=0;
sl@0: 		ctx->tmp_len=0;
sl@0: 		EVP_EncodeInit(&(ctx->base64));
sl@0: 		}
sl@0: 
sl@0: 	n=ctx->buf_len-ctx->buf_off;
sl@0: 	while (n > 0)
sl@0: 		{
sl@0: 		i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
sl@0: 		if (i <= 0)
sl@0: 			{
sl@0: 			BIO_copy_next_retry(b);
sl@0: 			return(i);
sl@0: 			}
sl@0: 		ctx->buf_off+=i;
sl@0: 		n-=i;
sl@0: 		}
sl@0: 	/* at this point all pending data has been written */
sl@0: 	ctx->buf_off=0;
sl@0: 	ctx->buf_len=0;
sl@0: 
sl@0: 	if ((in == NULL) || (inl <= 0)) return(0);
sl@0: 
sl@0: 	while (inl > 0)
sl@0: 		{
sl@0: 		n=(inl > B64_BLOCK_SIZE)?B64_BLOCK_SIZE:inl;
sl@0: 
sl@0: 		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
sl@0: 			{
sl@0: 			if (ctx->tmp_len > 0)
sl@0: 				{
sl@0: 				n=3-ctx->tmp_len;
sl@0: 				/* There's a teoretical possibility for this */
sl@0: 				if (n > inl) 
sl@0: 					n=inl;
sl@0: 				memcpy(&(ctx->tmp[ctx->tmp_len]),in,n);
sl@0: 				ctx->tmp_len+=n;
sl@0: 				if (ctx->tmp_len < 3)
sl@0: 					break;
sl@0: 				ctx->buf_len=EVP_EncodeBlock(
sl@0: 					(unsigned char *)ctx->buf,
sl@0: 					(unsigned char *)ctx->tmp,
sl@0: 					ctx->tmp_len);
sl@0: 				/* Since we're now done using the temporary
sl@0: 				   buffer, the length should be 0'd */
sl@0: 				ctx->tmp_len=0;
sl@0: 				}
sl@0: 			else
sl@0: 				{
sl@0: 				if (n < 3)
sl@0: 					{
sl@0: 					memcpy(&(ctx->tmp[0]),in,n);
sl@0: 					ctx->tmp_len=n;
sl@0: 					break;
sl@0: 					}
sl@0: 				n-=n%3;
sl@0: 				ctx->buf_len=EVP_EncodeBlock(
sl@0: 					(unsigned char *)ctx->buf,
sl@0: 					(unsigned char *)in,n);
sl@0: 				}
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			EVP_EncodeUpdate(&(ctx->base64),
sl@0: 				(unsigned char *)ctx->buf,&ctx->buf_len,
sl@0: 				(unsigned char *)in,n);
sl@0: 			}
sl@0: 		inl-=n;
sl@0: 		in+=n;
sl@0: 
sl@0: 		ctx->buf_off=0;
sl@0: 		n=ctx->buf_len;
sl@0: 		while (n > 0)
sl@0: 			{
sl@0: 			i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
sl@0: 			if (i <= 0)
sl@0: 				{
sl@0: 				BIO_copy_next_retry(b);
sl@0: 				return((ret == 0)?i:ret);
sl@0: 				}
sl@0: 			n-=i;
sl@0: 			ctx->buf_off+=i;
sl@0: 			}
sl@0: 		ctx->buf_len=0;
sl@0: 		ctx->buf_off=0;
sl@0: 		}
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: static long b64_ctrl(BIO *b, int cmd, long num, void *ptr)
sl@0: 	{
sl@0: 	BIO_B64_CTX *ctx;
sl@0: 	long ret=1;
sl@0: 	int i;
sl@0: 
sl@0: 	ctx=(BIO_B64_CTX *)b->ptr;
sl@0: 
sl@0: 	switch (cmd)
sl@0: 		{
sl@0: 	case BIO_CTRL_RESET:
sl@0: 		ctx->cont=1;
sl@0: 		ctx->start=1;
sl@0: 		ctx->encode=B64_NONE;
sl@0: 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		break;
sl@0: 	case BIO_CTRL_EOF:	/* More to read */
sl@0: 		if (ctx->cont <= 0)
sl@0: 			ret=1;
sl@0: 		else
sl@0: 			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		break;
sl@0: 	case BIO_CTRL_WPENDING: /* More to write in buffer */
sl@0: 		ret=ctx->buf_len-ctx->buf_off;
sl@0: 		if ((ret == 0) && (ctx->encode != B64_NONE)
sl@0: 			&& (ctx->base64.num != 0))
sl@0: 			ret=1;
sl@0: 		else if (ret <= 0)
sl@0: 			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		break;
sl@0: 	case BIO_CTRL_PENDING: /* More to read in buffer */
sl@0: 		ret=ctx->buf_len-ctx->buf_off;
sl@0: 		if (ret <= 0)
sl@0: 			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		break;
sl@0: 	case BIO_CTRL_FLUSH:
sl@0: 		/* do a final write */
sl@0: again:
sl@0: 		while (ctx->buf_len != ctx->buf_off)
sl@0: 			{
sl@0: 			i=b64_write(b,NULL,0);
sl@0: 			if (i < 0)
sl@0: 				return i;
sl@0: 			}
sl@0: 		if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
sl@0: 			{
sl@0: 			if (ctx->tmp_len != 0)
sl@0: 				{
sl@0: 				ctx->buf_len=EVP_EncodeBlock(
sl@0: 					(unsigned char *)ctx->buf,
sl@0: 					(unsigned char *)ctx->tmp,
sl@0: 					ctx->tmp_len);
sl@0: 				ctx->buf_off=0;
sl@0: 				ctx->tmp_len=0;
sl@0: 				goto again;
sl@0: 				}
sl@0: 			}
sl@0: 		else if (ctx->encode != B64_NONE && ctx->base64.num != 0)
sl@0: 			{
sl@0: 			ctx->buf_off=0;
sl@0: 			EVP_EncodeFinal(&(ctx->base64),
sl@0: 				(unsigned char *)ctx->buf,
sl@0: 				&(ctx->buf_len));
sl@0: 			/* push out the bytes */
sl@0: 			goto again;
sl@0: 			}
sl@0: 		/* Finally flush the underlying BIO */
sl@0: 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_C_DO_STATE_MACHINE:
sl@0: 		BIO_clear_retry_flags(b);
sl@0: 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		BIO_copy_next_retry(b);
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_CTRL_DUP:
sl@0: 		break;
sl@0: 	case BIO_CTRL_INFO:
sl@0: 	case BIO_CTRL_GET:
sl@0: 	case BIO_CTRL_SET:
sl@0: 	default:
sl@0: 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		break;
sl@0: 		}
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: static long b64_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
sl@0: 	{
sl@0: 	long ret=1;
sl@0: 
sl@0: 	if (b->next_bio == NULL) return(0);
sl@0: 	switch (cmd)
sl@0: 		{
sl@0: 	default:
sl@0: 		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
sl@0: 		break;
sl@0: 		}
sl@0: 	return(ret);
sl@0: 	}
sl@0: