[thirdparty/openssl.git] / crypto / evp / bio_b64.c

/* 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.]
 */

#include <stdio.h>
#include <errno.h>
#include "cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/evp.h>

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,void (*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;

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,
	};

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;
		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;
			/* else we should continue when called again */
			break;
			}
		i+=ctx->tmp_len;

		/* 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]))
					{
					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 (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->cont=i;
		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 */

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

	ctx->buf_off=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;
				memcpy(&(ctx->tmp[ctx->tmp_len]),in,n);
				ctx->tmp_len+=n;
				n=ctx->tmp_len;
				if (n < 3)
					break;
				ctx->buf_len=EVP_EncodeBlock(
					(unsigned char *)ctx->buf,
					(unsigned char *)ctx->tmp,n);
				}
			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->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)
				{
				ret=i;
				break;
				}
			}
		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->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, void (*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);
	}
Commit	Line	Data
d02b48c6	1	/* crypto/evp/bio_b64.c */
58964a49	2	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6 RE	3	* All rights reserved.
	4	*
	5	* This package is an SSL implementation written
	6	* by Eric Young (eay@cryptsoft.com).
	7	* The implementation was written so as to conform with Netscapes SSL.
	8	*
	9	* This library is free for commercial and non-commercial use as long as
	10	* the following conditions are aheared to. The following conditions
	11	* apply to all code found in this distribution, be it the RC4, RSA,
	12	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	13	* included with this distribution is covered by the same copyright terms
	14	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	15	*
	16	* Copyright remains Eric Young's, and as such any Copyright notices in
	17	* the code are not to be removed.
	18	* If this package is used in a product, Eric Young should be given attribution
	19	* as the author of the parts of the library used.
	20	* This can be in the form of a textual message at program startup or
	21	* in documentation (online or textual) provided with the package.
	22	*
	23	* Redistribution and use in source and binary forms, with or without
	24	* modification, are permitted provided that the following conditions
	25	* are met:
	26	* 1. Redistributions of source code must retain the copyright
	27	* notice, this list of conditions and the following disclaimer.
	28	* 2. Redistributions in binary form must reproduce the above copyright
	29	* notice, this list of conditions and the following disclaimer in the
	30	* documentation and/or other materials provided with the distribution.
	31	* 3. All advertising materials mentioning features or use of this software
	32	* must display the following acknowledgement:
	33	* "This product includes cryptographic software written by
	34	* Eric Young (eay@cryptsoft.com)"
	35	* The word 'cryptographic' can be left out if the rouines from the library
	36	* being used are not cryptographic related :-).
	37	* 4. If you include any Windows specific code (or a derivative thereof) from
	38	* the apps directory (application code) you must include an acknowledgement:
	39	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* The licence and distribution terms for any publically available version or
	54	* derivative of this code cannot be changed. i.e. this code cannot simply be
	55	* copied and put under another distribution licence
	56	* [including the GNU Public Licence.]
	57	*/
	58
	59	#include <stdio.h>
	60	#include <errno.h>
	61	#include "cryptlib.h"
ec577822 BM	62	#include <openssl/buffer.h>
ec577822 BM	63	#include <openssl/evp.h>
d02b48c6	64
0e1c0612 UM	65	static int b64_write(BIO h, const char buf, int num);
	66	static int b64_read(BIO h, char buf, int size);
	67	/static int b64_puts(BIO h, const char str); /
	68	/static int b64_gets(BIO h, char str, int size); /
	69	static long b64_ctrl(BIO h, int cmd, long arg1, void arg2);
d02b48c6 RE	70	static int b64_new(BIO *h);
d02b48c6 RE	71	static int b64_free(BIO *data);
d3442bc7	72	static long b64_callback_ctrl(BIO h,int cmd,void (fp)());
d02b48c6	73	#define B64_BLOCK_SIZE 1024
58964a49	74	#define B64_BLOCK_SIZE2 768
d02b48c6 RE	75	#define B64_NONE 0
	76	#define B64_ENCODE 1
	77	#define B64_DECODE 2
	78
	79	typedef struct b64_struct
	80	{
	81	/BIO bio; moved to the BIO structure */
	82	int buf_len;
	83	int buf_off;
	84	int tmp_len; /* used to find the start when decoding */
	85	int tmp_nl; /* If true, scan until '\n' */
	86	int encode;
	87	int start; /* have we started decoding yet? */
	88	int cont; /* <= 0 when finished */
	89	EVP_ENCODE_CTX base64;
	90	char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE)+10];
	91	char tmp[B64_BLOCK_SIZE];
	92	} BIO_B64_CTX;
	93
	94	static BIO_METHOD methods_b64=
	95	{
	96	BIO_TYPE_BASE64,"base64 encoding",
	97	b64_write,
	98	b64_read,
	99	NULL, /* b64_puts, */
	100	NULL, /* b64_gets, */
	101	b64_ctrl,
	102	b64_new,
	103	b64_free,
d3442bc7	104	b64_callback_ctrl,
d02b48c6 RE	105	};
d02b48c6 RE	106
6b691a5c	107	BIO_METHOD *BIO_f_base64(void)
d02b48c6 RE	108	{
	109	return(&methods_b64);
	110	}
	111
6b691a5c	112	static int b64_new(BIO *bi)
d02b48c6 RE	113	{
	114	BIO_B64_CTX *ctx;
	115
26a3a48d	116	ctx=(BIO_B64_CTX *)OPENSSL_malloc(sizeof(BIO_B64_CTX));
d02b48c6 RE	117	if (ctx == NULL) return(0);
	118
	119	ctx->buf_len=0;
	120	ctx->tmp_len=0;
	121	ctx->tmp_nl=0;
	122	ctx->buf_off=0;
	123	ctx->cont=1;
	124	ctx->start=1;
	125	ctx->encode=0;
	126
	127	bi->init=1;
	128	bi->ptr=(char *)ctx;
	129	bi->flags=0;
	130	return(1);
	131	}
	132
6b691a5c	133	static int b64_free(BIO *a)
d02b48c6 RE	134	{
d02b48c6 RE	135	if (a == NULL) return(0);
26a3a48d	136	OPENSSL_free(a->ptr);
d02b48c6 RE	137	a->ptr=NULL;
	138	a->init=0;
	139	a->flags=0;
	140	return(1);
	141	}
	142
6b691a5c	143	static int b64_read(BIO b, char out, int outl)
d02b48c6	144	{
58964a49	145	int ret=0,i,ii,j,k,x,n,num,ret_code=0;
d02b48c6 RE	146	BIO_B64_CTX *ctx;
	147	unsigned char p,q;
	148
	149	if (out == NULL) return(0);
	150	ctx=(BIO_B64_CTX *)b->ptr;
	151
	152	if ((ctx == NULL) \|\| (b->next_bio == NULL)) return(0);
	153
	154	if (ctx->encode != B64_DECODE)
	155	{
	156	ctx->encode=B64_DECODE;
	157	ctx->buf_len=0;
	158	ctx->buf_off=0;
58964a49	159	ctx->tmp_len=0;
d02b48c6 RE	160	EVP_DecodeInit(&(ctx->base64));
	161	}
	162
	163	/* First check if there are bytes decoded/encoded */
	164	if (ctx->buf_len > 0)
	165	{
	166	i=ctx->buf_len-ctx->buf_off;
	167	if (i > outl) i=outl;
	168	memcpy(out,&(ctx->buf[ctx->buf_off]),i);
	169	ret=i;
	170	out+=i;
	171	outl-=i;
	172	ctx->buf_off+=i;
	173	if (ctx->buf_len == ctx->buf_off)
	174	{
	175	ctx->buf_len=0;
	176	ctx->buf_off=0;
	177	}
	178	}
	179
	180	/* At this point, we have room of outl bytes and an empty
	181	* buffer, so we should read in some more. */
	182
58964a49	183	ret_code=0;
d02b48c6 RE	184	while (outl > 0)
	185	{
	186	if (ctx->cont <= 0) break;
	187
	188	i=BIO_read(b->next_bio,&(ctx->tmp[ctx->tmp_len]),
	189	B64_BLOCK_SIZE-ctx->tmp_len);
	190
	191	if (i <= 0)
	192	{
58964a49 RE	193	ret_code=i;
58964a49 RE	194
d02b48c6 RE	195	/* Should be continue next time we are called? */
	196	if (!BIO_should_retry(b->next_bio))
	197	ctx->cont=i;
58964a49	198	/* else we should continue when called again */
d02b48c6 RE	199	break;
	200	}
	201	i+=ctx->tmp_len;
	202
	203	/* We need to scan, a line at a time until we
	204	* have a valid line if we are starting. */
58964a49 RE	205	if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL))
	206	{
	207	/* ctx->start=1; */
	208	ctx->tmp_len=0;
	209	}
	210	else if (ctx->start)
d02b48c6 RE	211	{
	212	q=p=(unsigned char *)ctx->tmp;
	213	for (j=0; j<i; j++)
	214	{
	215	if (*(q++) != '\n') continue;
	216
	217	/* due to a previous very long line,
	218	* we need to keep on scanning for a '\n'
	219	* before we even start looking for
	220	* base64 encoded stuff. */
	221	if (ctx->tmp_nl)
	222	{
	223	p=q;
	224	ctx->tmp_nl=0;
	225	continue;
	226	}
	227
	228	k=EVP_DecodeUpdate(&(ctx->base64),
	229	(unsigned char *)ctx->buf,
	230	&num,p,q-p);
	231	if ((k <= 0) && (num == 0) && (ctx->start))
	232	EVP_DecodeInit(&ctx->base64);
	233	else
	234	{
	235	if (p != (unsigned char *)
	236	&(ctx->tmp[0]))
	237	{
	238	i-=(p- (unsigned char *)
	239	&(ctx->tmp[0]));
	240	for (x=0; x < i; x++)
	241	ctx->tmp[x]=p[x];
d02b48c6	242	}
4579dd5d	243	EVP_DecodeInit(&ctx->base64);
d02b48c6 RE	244	ctx->start=0;
	245	break;
	246	}
	247	p=q;
	248	}
	249
	250	/* we fell off the end without starting */
	251	if (j == i)
	252	{
	253	/* Is this is one long chunk?, if so, keep on
	254	* reading until a new line. */
	255	if (p == (unsigned char *)&(ctx->tmp[0]))
	256	{
	257	ctx->tmp_nl=1;
	258	ctx->tmp_len=0;
	259	}
	260	else if (p != q) /* finished on a '\n' */
	261	{
	262	n=q-p;
	263	for (ii=0; ii<n; ii++)
	264	ctx->tmp[ii]=p[ii];
	265	ctx->tmp_len=n;
	266	}
	267	/* else finished on a '\n' */
	268	continue;
	269	}
	270	else
	271	ctx->tmp_len=0;
	272	}
58964a49 RE	273
	274	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
	275	{
	276	int z,jj;
	277
	278	jj=(i>>2)<<2;
	279	z=EVP_DecodeBlock((unsigned char *)ctx->buf,
	280	(unsigned char *)ctx->tmp,jj);
	281	if (jj > 2)
	282	{
	283	if (ctx->tmp[jj-1] == '=')
	284	{
	285	z--;
	286	if (ctx->tmp[jj-2] == '=')
	287	z--;
	288	}
	289	}
	290	/* z is now number of output bytes and jj is the
	291	* number consumed */
	292	if (jj != i)
	293	{
	294	memcpy((unsigned char *)ctx->tmp,
	295	(unsigned char *)&(ctx->tmp[jj]),i-jj);
	296	ctx->tmp_len=i-jj;
	297	}
	298	ctx->buf_len=0;
	299	if (z > 0)
	300	{
	301	ctx->buf_len=z;
	302	i=1;
	303	}
	304	else
	305	i=z;
	306	}
	307	else
	308	{
	309	i=EVP_DecodeUpdate(&(ctx->base64),
	310	(unsigned char *)ctx->buf,&ctx->buf_len,
	311	(unsigned char *)ctx->tmp,i);
	312	}
d02b48c6 RE	313	ctx->cont=i;
	314	ctx->buf_off=0;
	315	if (i < 0)
	316	{
58964a49	317	ret_code=0;
d02b48c6 RE	318	ctx->buf_len=0;
	319	break;
	320	}
	321
	322	if (ctx->buf_len <= outl)
	323	i=ctx->buf_len;
	324	else
	325	i=outl;
	326
	327	memcpy(out,ctx->buf,i);
	328	ret+=i;
	329	ctx->buf_off=i;
	330	if (ctx->buf_off == ctx->buf_len)
	331	{
	332	ctx->buf_len=0;
	333	ctx->buf_off=0;
	334	}
	335	outl-=i;
	336	out+=i;
	337	}
	338	BIO_clear_retry_flags(b);
	339	BIO_copy_next_retry(b);
58964a49	340	return((ret == 0)?ret_code:ret);
d02b48c6 RE	341	}
d02b48c6 RE	342
0e1c0612	343	static int b64_write(BIO b, const char in, int inl)
d02b48c6 RE	344	{
	345	int ret=inl,n,i;
	346	BIO_B64_CTX *ctx;
	347
	348	ctx=(BIO_B64_CTX *)b->ptr;
	349	BIO_clear_retry_flags(b);
	350
	351	if (ctx->encode != B64_ENCODE)
	352	{
	353	ctx->encode=B64_ENCODE;
	354	ctx->buf_len=0;
	355	ctx->buf_off=0;
58964a49	356	ctx->tmp_len=0;
d02b48c6 RE	357	EVP_EncodeInit(&(ctx->base64));
	358	}
	359
	360	n=ctx->buf_len-ctx->buf_off;
	361	while (n > 0)
	362	{
	363	i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
	364	if (i <= 0)
	365	{
	366	BIO_copy_next_retry(b);
	367	return(i);
	368	}
	369	ctx->buf_off+=i;
	370	n-=i;
	371	}
	372	/* at this point all pending data has been written */
	373
	374	if ((in == NULL) \|\| (inl <= 0)) return(0);
	375
	376	ctx->buf_off=0;
	377	while (inl > 0)
	378	{
	379	n=(inl > B64_BLOCK_SIZE)?B64_BLOCK_SIZE:inl;
58964a49 RE	380
	381	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
	382	{
	383	if (ctx->tmp_len > 0)
	384	{
	385	n=3-ctx->tmp_len;
	386	memcpy(&(ctx->tmp[ctx->tmp_len]),in,n);
	387	ctx->tmp_len+=n;
	388	n=ctx->tmp_len;
	389	if (n < 3)
	390	break;
	391	ctx->buf_len=EVP_EncodeBlock(
	392	(unsigned char *)ctx->buf,
	393	(unsigned char *)ctx->tmp,n);
	394	}
	395	else
	396	{
	397	if (n < 3)
	398	{
	399	memcpy(&(ctx->tmp[0]),in,n);
	400	ctx->tmp_len=n;
	401	break;
	402	}
	403	n-=n%3;
	404	ctx->buf_len=EVP_EncodeBlock(
	405	(unsigned char *)ctx->buf,
	406	(unsigned char *)in,n);
	407	}
	408	}
	409	else
	410	{
	411	EVP_EncodeUpdate(&(ctx->base64),
	412	(unsigned char *)ctx->buf,&ctx->buf_len,
	413	(unsigned char *)in,n);
	414	}
d02b48c6 RE	415	inl-=n;
	416	in+=n;
	417
	418	ctx->buf_off=0;
	419	n=ctx->buf_len;
	420	while (n > 0)
	421	{
	422	i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
	423	if (i <= 0)
	424	{
	425	BIO_copy_next_retry(b);
	426	return((ret == 0)?i:ret);
	427	}
	428	n-=i;
	429	ctx->buf_off+=i;
	430	}
	431	ctx->buf_len=0;
	432	ctx->buf_off=0;
	433	}
	434	return(ret);
	435	}
	436
0e1c0612	437	static long b64_ctrl(BIO b, int cmd, long num, void ptr)
d02b48c6 RE	438	{
	439	BIO_B64_CTX *ctx;
	440	long ret=1;
	441	int i;
	442
	443	ctx=(BIO_B64_CTX *)b->ptr;
	444
	445	switch (cmd)
	446	{
	447	case BIO_CTRL_RESET:
	448	ctx->cont=1;
	449	ctx->start=1;
	450	ctx->encode=B64_NONE;
	451	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	452	break;
	453	case BIO_CTRL_EOF: /* More to read */
	454	if (ctx->cont <= 0)
	455	ret=1;
	456	else
	457	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	458	break;
	459	case BIO_CTRL_WPENDING: /* More to write in buffer */
	460	ret=ctx->buf_len-ctx->buf_off;
	461	if ((ret == 0) && (ctx->base64.num != 0))
	462	ret=1;
	463	else if (ret <= 0)
	464	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	465	break;
	466	case BIO_CTRL_PENDING: /* More to read in buffer */
	467	ret=ctx->buf_len-ctx->buf_off;
	468	if (ret <= 0)
	469	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	470	break;
	471	case BIO_CTRL_FLUSH:
	472	/* do a final write */
	473	again:
	474	while (ctx->buf_len != ctx->buf_off)
	475	{
	476	i=b64_write(b,NULL,0);
	477	if (i < 0)
	478	{
	479	ret=i;
	480	break;
	481	}
	482	}
58964a49 RE	483	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
	484	{
	485	if (ctx->tmp_len != 0)
	486	{
	487	ctx->buf_len=EVP_EncodeBlock(
	488	(unsigned char *)ctx->buf,
	489	(unsigned char *)ctx->tmp,
	490	ctx->tmp_len);
	491	ctx->buf_off=0;
	492	ctx->tmp_len=0;
	493	goto again;
	494	}
	495	}
	496	else if (ctx->base64.num != 0)
d02b48c6 RE	497	{
	498	ctx->buf_off=0;
	499	EVP_EncodeFinal(&(ctx->base64),
	500	(unsigned char *)ctx->buf,
	501	&(ctx->buf_len));
	502	/* push out the bytes */
	503	goto again;
	504	}
	505	/* Finally flush the underlying BIO */
	506	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	507	break;
	508
	509	case BIO_C_DO_STATE_MACHINE:
	510	BIO_clear_retry_flags(b);
	511	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	512	BIO_copy_next_retry(b);
	513	break;
	514
	515	case BIO_CTRL_DUP:
	516	break;
	517	case BIO_CTRL_INFO:
	518	case BIO_CTRL_GET:
	519	case BIO_CTRL_SET:
	520	default:
	521	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	522	break;
	523	}
	524	return(ret);
	525	}
	526
d3442bc7 RL	527	static long b64_callback_ctrl(BIO b, int cmd, void (fp)())
	528	{
	529	long ret=1;
	530
	531	if (b->next_bio == NULL) return(0);
	532	switch (cmd)
	533	{
	534	default:
	535	ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
	536	break;
	537	}
	538	return(ret);
	539	}
	540