[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 "buffer.h"
#include "evp.h"

#ifndef NOPROTO
static int b64_write(BIO *h,char *buf,int num);
static int b64_read(BIO *h,char *buf,int size);
/*static int b64_puts(BIO *h,char *str); */
/*static int b64_gets(BIO *h,char *str,int size); */
static long b64_ctrl(BIO *h,int cmd,long arg1,char *arg2);
static int b64_new(BIO *h);
static int b64_free(BIO *data);
#else
static int b64_write();
static int b64_read();
/*static int b64_puts(); */
/*static int b64_gets(); */
static long b64_ctrl();
static int b64_new();
static int b64_free();
#endif

#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,
	};

BIO_METHOD *BIO_f_base64()
	{
	return(&methods_b64);
	}

static int b64_new(bi)
BIO *bi;
	{
	BIO_B64_CTX *ctx;

	ctx=(BIO_B64_CTX *)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(a)
BIO *a;
	{
	if (a == NULL) return(0);
	Free(a->ptr);
	a->ptr=NULL;
	a->init=0;
	a->flags=0;
	return(1);
	}
	
static int b64_read(b,out,outl)
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(b,in,inl)
BIO *b;
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(b,cmd,num,ptr)
BIO *b;
int cmd;
long num;
char *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);
	}
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"
	62	#include "buffer.h"
	63	#include "evp.h"
	64
	65	#ifndef NOPROTO
	66	static int b64_write(BIO h,char buf,int num);
67	static int b64_read(BIO h,char buf,int size);
68	/static int b64_puts(BIO h,char str); /
69	/static int b64_gets(BIO h,char str,int size); /
70	static long b64_ctrl(BIO h,int cmd,long arg1,char arg2);
71	static int b64_new(BIO *h);
72	static int b64_free(BIO *data);
73	#else
74	static int b64_write();
75	static int b64_read();
76	/static int b64_puts(); /
77	/static int b64_gets(); /
78	static long b64_ctrl();
79	static int b64_new();
80	static int b64_free();
81	#endif
82
83	#define B64_BLOCK_SIZE 1024
58964a49	84	#define B64_BLOCK_SIZE2 768
d02b48c6 RE	85	#define B64_NONE 0
	86	#define B64_ENCODE 1
	87	#define B64_DECODE 2
	88
	89	typedef struct b64_struct
	90	{
	91	/BIO bio; moved to the BIO structure */
	92	int buf_len;
	93	int buf_off;
	94	int tmp_len; /* used to find the start when decoding */
	95	int tmp_nl; /* If true, scan until '\n' */
	96	int encode;
	97	int start; /* have we started decoding yet? */
	98	int cont; /* <= 0 when finished */
	99	EVP_ENCODE_CTX base64;
	100	char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE)+10];
	101	char tmp[B64_BLOCK_SIZE];
	102	} BIO_B64_CTX;
	103
	104	static BIO_METHOD methods_b64=
	105	{
	106	BIO_TYPE_BASE64,"base64 encoding",
	107	b64_write,
	108	b64_read,
	109	NULL, /* b64_puts, */
	110	NULL, /* b64_gets, */
	111	b64_ctrl,
	112	b64_new,
	113	b64_free,
	114	};
	115
	116	BIO_METHOD *BIO_f_base64()
	117	{
	118	return(&methods_b64);
	119	}
	120
	121	static int b64_new(bi)
	122	BIO *bi;
	123	{
	124	BIO_B64_CTX *ctx;
	125
	126	ctx=(BIO_B64_CTX *)Malloc(sizeof(BIO_B64_CTX));
	127	if (ctx == NULL) return(0);
	128
	129	ctx->buf_len=0;
	130	ctx->tmp_len=0;
	131	ctx->tmp_nl=0;
	132	ctx->buf_off=0;
	133	ctx->cont=1;
	134	ctx->start=1;
	135	ctx->encode=0;
	136
	137	bi->init=1;
	138	bi->ptr=(char *)ctx;
	139	bi->flags=0;
	140	return(1);
	141	}
	142
	143	static int b64_free(a)
	144	BIO *a;
	145	{
	146	if (a == NULL) return(0);
	147	Free(a->ptr);
	148	a->ptr=NULL;
149	a->init=0;
150	a->flags=0;
151	return(1);
152	}
153
154	static int b64_read(b,out,outl)
155	BIO *b;
156	char *out;
157	int outl;
158	{
58964a49	159	int ret=0,i,ii,j,k,x,n,num,ret_code=0;
d02b48c6 RE	160	BIO_B64_CTX *ctx;
	161	unsigned char p,q;
	162
	163	if (out == NULL) return(0);
	164	ctx=(BIO_B64_CTX *)b->ptr;
	165
	166	if ((ctx == NULL) \|\| (b->next_bio == NULL)) return(0);
	167
	168	if (ctx->encode != B64_DECODE)
	169	{
	170	ctx->encode=B64_DECODE;
	171	ctx->buf_len=0;
	172	ctx->buf_off=0;
58964a49	173	ctx->tmp_len=0;
d02b48c6 RE	174	EVP_DecodeInit(&(ctx->base64));
	175	}
	176
	177	/* First check if there are bytes decoded/encoded */
	178	if (ctx->buf_len > 0)
	179	{
	180	i=ctx->buf_len-ctx->buf_off;
	181	if (i > outl) i=outl;
	182	memcpy(out,&(ctx->buf[ctx->buf_off]),i);
	183	ret=i;
	184	out+=i;
	185	outl-=i;
	186	ctx->buf_off+=i;
	187	if (ctx->buf_len == ctx->buf_off)
	188	{
	189	ctx->buf_len=0;
	190	ctx->buf_off=0;
	191	}
	192	}
	193
	194	/* At this point, we have room of outl bytes and an empty
	195	* buffer, so we should read in some more. */
	196
58964a49	197	ret_code=0;
d02b48c6 RE	198	while (outl > 0)
	199	{
	200	if (ctx->cont <= 0) break;
	201
	202	i=BIO_read(b->next_bio,&(ctx->tmp[ctx->tmp_len]),
	203	B64_BLOCK_SIZE-ctx->tmp_len);
	204
	205	if (i <= 0)
	206	{
58964a49 RE	207	ret_code=i;
58964a49 RE	208
d02b48c6 RE	209	/* Should be continue next time we are called? */
	210	if (!BIO_should_retry(b->next_bio))
	211	ctx->cont=i;
58964a49	212	/* else we should continue when called again */
d02b48c6 RE	213	break;
	214	}
	215	i+=ctx->tmp_len;
	216
	217	/* We need to scan, a line at a time until we
	218	* have a valid line if we are starting. */
58964a49 RE	219	if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL))
	220	{
	221	/* ctx->start=1; */
	222	ctx->tmp_len=0;
	223	}
	224	else if (ctx->start)
d02b48c6 RE	225	{
	226	q=p=(unsigned char *)ctx->tmp;
	227	for (j=0; j<i; j++)
	228	{
	229	if (*(q++) != '\n') continue;
	230
	231	/* due to a previous very long line,
	232	* we need to keep on scanning for a '\n'
	233	* before we even start looking for
	234	* base64 encoded stuff. */
	235	if (ctx->tmp_nl)
	236	{
	237	p=q;
	238	ctx->tmp_nl=0;
	239	continue;
	240	}
	241
	242	k=EVP_DecodeUpdate(&(ctx->base64),
	243	(unsigned char *)ctx->buf,
	244	&num,p,q-p);
	245	if ((k <= 0) && (num == 0) && (ctx->start))
	246	EVP_DecodeInit(&ctx->base64);
	247	else
	248	{
	249	if (p != (unsigned char *)
	250	&(ctx->tmp[0]))
	251	{
	252	i-=(p- (unsigned char *)
	253	&(ctx->tmp[0]));
	254	for (x=0; x < i; x++)
	255	ctx->tmp[x]=p[x];
	256	EVP_DecodeInit(&ctx->base64);
	257	}
	258	ctx->start=0;
	259	break;
	260	}
	261	p=q;
	262	}
	263
	264	/* we fell off the end without starting */
	265	if (j == i)
	266	{
	267	/* Is this is one long chunk?, if so, keep on
	268	* reading until a new line. */
	269	if (p == (unsigned char *)&(ctx->tmp[0]))
	270	{
	271	ctx->tmp_nl=1;
	272	ctx->tmp_len=0;
	273	}
	274	else if (p != q) /* finished on a '\n' */
	275	{
	276	n=q-p;
	277	for (ii=0; ii<n; ii++)
	278	ctx->tmp[ii]=p[ii];
	279	ctx->tmp_len=n;
	280	}
	281	/* else finished on a '\n' */
	282	continue;
	283	}
	284	else
	285	ctx->tmp_len=0;
	286	}
58964a49 RE	287
	288	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
	289	{
	290	int z,jj;
	291
	292	jj=(i>>2)<<2;
	293	z=EVP_DecodeBlock((unsigned char *)ctx->buf,
	294	(unsigned char *)ctx->tmp,jj);
	295	if (jj > 2)
	296	{
	297	if (ctx->tmp[jj-1] == '=')
	298	{
	299	z--;
	300	if (ctx->tmp[jj-2] == '=')
	301	z--;
	302	}
	303	}
	304	/* z is now number of output bytes and jj is the
	305	* number consumed */
	306	if (jj != i)
	307	{
	308	memcpy((unsigned char *)ctx->tmp,
	309	(unsigned char *)&(ctx->tmp[jj]),i-jj);
	310	ctx->tmp_len=i-jj;
	311	}
	312	ctx->buf_len=0;
	313	if (z > 0)
	314	{
	315	ctx->buf_len=z;
	316	i=1;
	317	}
	318	else
	319	i=z;
	320	}
	321	else
	322	{
	323	i=EVP_DecodeUpdate(&(ctx->base64),
	324	(unsigned char *)ctx->buf,&ctx->buf_len,
	325	(unsigned char *)ctx->tmp,i);
	326	}
d02b48c6 RE	327	ctx->cont=i;
	328	ctx->buf_off=0;
	329	if (i < 0)
	330	{
58964a49	331	ret_code=0;
d02b48c6 RE	332	ctx->buf_len=0;
	333	break;
	334	}
	335
	336	if (ctx->buf_len <= outl)
	337	i=ctx->buf_len;
	338	else
	339	i=outl;
	340
	341	memcpy(out,ctx->buf,i);
	342	ret+=i;
	343	ctx->buf_off=i;
	344	if (ctx->buf_off == ctx->buf_len)
	345	{
	346	ctx->buf_len=0;
	347	ctx->buf_off=0;
	348	}
	349	outl-=i;
	350	out+=i;
	351	}
	352	BIO_clear_retry_flags(b);
	353	BIO_copy_next_retry(b);
58964a49	354	return((ret == 0)?ret_code:ret);
d02b48c6 RE	355	}
	356
	357	static int b64_write(b,in,inl)
	358	BIO *b;
	359	char *in;
	360	int inl;
	361	{
	362	int ret=inl,n,i;
	363	BIO_B64_CTX *ctx;
	364
	365	ctx=(BIO_B64_CTX *)b->ptr;
	366	BIO_clear_retry_flags(b);
	367
	368	if (ctx->encode != B64_ENCODE)
	369	{
	370	ctx->encode=B64_ENCODE;
	371	ctx->buf_len=0;
	372	ctx->buf_off=0;
58964a49	373	ctx->tmp_len=0;
d02b48c6 RE	374	EVP_EncodeInit(&(ctx->base64));
	375	}
	376
	377	n=ctx->buf_len-ctx->buf_off;
	378	while (n > 0)
	379	{
	380	i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
	381	if (i <= 0)
	382	{
	383	BIO_copy_next_retry(b);
	384	return(i);
	385	}
	386	ctx->buf_off+=i;
	387	n-=i;
	388	}
	389	/* at this point all pending data has been written */
	390
	391	if ((in == NULL) \|\| (inl <= 0)) return(0);
	392
	393	ctx->buf_off=0;
	394	while (inl > 0)
	395	{
	396	n=(inl > B64_BLOCK_SIZE)?B64_BLOCK_SIZE:inl;
58964a49 RE	397
	398	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
	399	{
	400	if (ctx->tmp_len > 0)
	401	{
	402	n=3-ctx->tmp_len;
	403	memcpy(&(ctx->tmp[ctx->tmp_len]),in,n);
	404	ctx->tmp_len+=n;
	405	n=ctx->tmp_len;
	406	if (n < 3)
	407	break;
	408	ctx->buf_len=EVP_EncodeBlock(
	409	(unsigned char *)ctx->buf,
	410	(unsigned char *)ctx->tmp,n);
	411	}
	412	else
	413	{
	414	if (n < 3)
	415	{
	416	memcpy(&(ctx->tmp[0]),in,n);
	417	ctx->tmp_len=n;
	418	break;
	419	}
	420	n-=n%3;
	421	ctx->buf_len=EVP_EncodeBlock(
	422	(unsigned char *)ctx->buf,
	423	(unsigned char *)in,n);
	424	}
	425	}
	426	else
	427	{
	428	EVP_EncodeUpdate(&(ctx->base64),
	429	(unsigned char *)ctx->buf,&ctx->buf_len,
	430	(unsigned char *)in,n);
	431	}
d02b48c6 RE	432	inl-=n;
	433	in+=n;
	434
	435	ctx->buf_off=0;
	436	n=ctx->buf_len;
	437	while (n > 0)
	438	{
	439	i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
	440	if (i <= 0)
	441	{
	442	BIO_copy_next_retry(b);
	443	return((ret == 0)?i:ret);
	444	}
	445	n-=i;
	446	ctx->buf_off+=i;
	447	}
	448	ctx->buf_len=0;
	449	ctx->buf_off=0;
	450	}
	451	return(ret);
	452	}
	453
	454	static long b64_ctrl(b,cmd,num,ptr)
	455	BIO *b;
	456	int cmd;
	457	long num;
	458	char *ptr;
	459	{
	460	BIO_B64_CTX *ctx;
	461	long ret=1;
	462	int i;
	463
	464	ctx=(BIO_B64_CTX *)b->ptr;
	465
	466	switch (cmd)
	467	{
	468	case BIO_CTRL_RESET:
	469	ctx->cont=1;
	470	ctx->start=1;
	471	ctx->encode=B64_NONE;
	472	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	473	break;
	474	case BIO_CTRL_EOF: /* More to read */
	475	if (ctx->cont <= 0)
	476	ret=1;
	477	else
	478	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	479	break;
	480	case BIO_CTRL_WPENDING: /* More to write in buffer */
	481	ret=ctx->buf_len-ctx->buf_off;
	482	if ((ret == 0) && (ctx->base64.num != 0))
	483	ret=1;
	484	else if (ret <= 0)
	485	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	486	break;
	487	case BIO_CTRL_PENDING: /* More to read in buffer */
	488	ret=ctx->buf_len-ctx->buf_off;
	489	if (ret <= 0)
	490	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	491	break;
	492	case BIO_CTRL_FLUSH:
	493	/* do a final write */
	494	again:
	495	while (ctx->buf_len != ctx->buf_off)
496	{
497	i=b64_write(b,NULL,0);
498	if (i < 0)
499	{
500	ret=i;
501	break;
502	}
503	}
58964a49 RE	504	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
	505	{
	506	if (ctx->tmp_len != 0)
	507	{
	508	ctx->buf_len=EVP_EncodeBlock(
	509	(unsigned char *)ctx->buf,
	510	(unsigned char *)ctx->tmp,
	511	ctx->tmp_len);
	512	ctx->buf_off=0;
	513	ctx->tmp_len=0;
	514	goto again;
	515	}
	516	}
	517	else if (ctx->base64.num != 0)
d02b48c6 RE	518	{
	519	ctx->buf_off=0;
	520	EVP_EncodeFinal(&(ctx->base64),
	521	(unsigned char *)ctx->buf,
	522	&(ctx->buf_len));
	523	/* push out the bytes */
	524	goto again;
	525	}
	526	/* Finally flush the underlying BIO */
	527	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	528	break;
	529
	530	case BIO_C_DO_STATE_MACHINE:
	531	BIO_clear_retry_flags(b);
	532	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	533	BIO_copy_next_retry(b);
	534	break;
	535
	536	case BIO_CTRL_DUP:
	537	break;
	538	case BIO_CTRL_INFO:
	539	case BIO_CTRL_GET:
	540	case BIO_CTRL_SET:
	541	default:
	542	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	543	break;
	544	}
	545	return(ret);
	546	}
	547