[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,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);
#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(void)
	{
	return(&methods_b64);
	}

static int b64_new(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(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(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, 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, 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"
ec577822 BM	62	#include <openssl/buffer.h>
ec577822 BM	63	#include <openssl/evp.h>
d02b48c6	64
d02b48c6 RE	65	static int b64_write(BIO h,char buf,int num);
	66	static int b64_read(BIO h,char buf,int size);
	67	/static int b64_puts(BIO h,char str); /
	68	/static int b64_gets(BIO h,char str,int size); /
	69	static long b64_ctrl(BIO h,int cmd,long arg1,char arg2);
	70	static int b64_new(BIO *h);
	71	static int b64_free(BIO *data);
d02b48c6	72	#define B64_BLOCK_SIZE 1024
58964a49	73	#define B64_BLOCK_SIZE2 768
d02b48c6 RE	74	#define B64_NONE 0
	75	#define B64_ENCODE 1
	76	#define B64_DECODE 2
	77
	78	typedef struct b64_struct
	79	{
	80	/BIO bio; moved to the BIO structure */
	81	int buf_len;
	82	int buf_off;
	83	int tmp_len; /* used to find the start when decoding */
	84	int tmp_nl; /* If true, scan until '\n' */
	85	int encode;
	86	int start; /* have we started decoding yet? */
	87	int cont; /* <= 0 when finished */
	88	EVP_ENCODE_CTX base64;
	89	char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE)+10];
	90	char tmp[B64_BLOCK_SIZE];
	91	} BIO_B64_CTX;
	92
	93	static BIO_METHOD methods_b64=
	94	{
	95	BIO_TYPE_BASE64,"base64 encoding",
	96	b64_write,
	97	b64_read,
	98	NULL, /* b64_puts, */
	99	NULL, /* b64_gets, */
	100	b64_ctrl,
	101	b64_new,
	102	b64_free,
	103	};
	104
6b691a5c	105	BIO_METHOD *BIO_f_base64(void)
d02b48c6 RE	106	{
	107	return(&methods_b64);
	108	}
	109
6b691a5c	110	static int b64_new(BIO *bi)
d02b48c6 RE	111	{
	112	BIO_B64_CTX *ctx;
	113
	114	ctx=(BIO_B64_CTX *)Malloc(sizeof(BIO_B64_CTX));
	115	if (ctx == NULL) return(0);
	116
	117	ctx->buf_len=0;
	118	ctx->tmp_len=0;
	119	ctx->tmp_nl=0;
	120	ctx->buf_off=0;
	121	ctx->cont=1;
	122	ctx->start=1;
	123	ctx->encode=0;
	124
	125	bi->init=1;
	126	bi->ptr=(char *)ctx;
	127	bi->flags=0;
	128	return(1);
	129	}
	130
6b691a5c	131	static int b64_free(BIO *a)
d02b48c6 RE	132	{
	133	if (a == NULL) return(0);
	134	Free(a->ptr);
	135	a->ptr=NULL;
	136	a->init=0;
	137	a->flags=0;
	138	return(1);
	139	}
	140
6b691a5c	141	static int b64_read(BIO b, char out, int outl)
d02b48c6	142	{
58964a49	143	int ret=0,i,ii,j,k,x,n,num,ret_code=0;
d02b48c6 RE	144	BIO_B64_CTX *ctx;
	145	unsigned char p,q;
	146
	147	if (out == NULL) return(0);
	148	ctx=(BIO_B64_CTX *)b->ptr;
	149
	150	if ((ctx == NULL) \|\| (b->next_bio == NULL)) return(0);
	151
	152	if (ctx->encode != B64_DECODE)
	153	{
	154	ctx->encode=B64_DECODE;
	155	ctx->buf_len=0;
	156	ctx->buf_off=0;
58964a49	157	ctx->tmp_len=0;
d02b48c6 RE	158	EVP_DecodeInit(&(ctx->base64));
	159	}
	160
	161	/* First check if there are bytes decoded/encoded */
	162	if (ctx->buf_len > 0)
	163	{
	164	i=ctx->buf_len-ctx->buf_off;
	165	if (i > outl) i=outl;
	166	memcpy(out,&(ctx->buf[ctx->buf_off]),i);
	167	ret=i;
	168	out+=i;
	169	outl-=i;
	170	ctx->buf_off+=i;
	171	if (ctx->buf_len == ctx->buf_off)
	172	{
	173	ctx->buf_len=0;
	174	ctx->buf_off=0;
	175	}
	176	}
	177
	178	/* At this point, we have room of outl bytes and an empty
	179	* buffer, so we should read in some more. */
	180
58964a49	181	ret_code=0;
d02b48c6 RE	182	while (outl > 0)
	183	{
	184	if (ctx->cont <= 0) break;
	185
	186	i=BIO_read(b->next_bio,&(ctx->tmp[ctx->tmp_len]),
	187	B64_BLOCK_SIZE-ctx->tmp_len);
	188
	189	if (i <= 0)
	190	{
58964a49 RE	191	ret_code=i;
58964a49 RE	192
d02b48c6 RE	193	/* Should be continue next time we are called? */
	194	if (!BIO_should_retry(b->next_bio))
	195	ctx->cont=i;
58964a49	196	/* else we should continue when called again */
d02b48c6 RE	197	break;
	198	}
	199	i+=ctx->tmp_len;
	200
	201	/* We need to scan, a line at a time until we
	202	* have a valid line if we are starting. */
58964a49 RE	203	if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL))
	204	{
	205	/* ctx->start=1; */
	206	ctx->tmp_len=0;
	207	}
	208	else if (ctx->start)
d02b48c6 RE	209	{
	210	q=p=(unsigned char *)ctx->tmp;
	211	for (j=0; j<i; j++)
	212	{
	213	if (*(q++) != '\n') continue;
	214
	215	/* due to a previous very long line,
	216	* we need to keep on scanning for a '\n'
	217	* before we even start looking for
	218	* base64 encoded stuff. */
	219	if (ctx->tmp_nl)
	220	{
	221	p=q;
	222	ctx->tmp_nl=0;
	223	continue;
	224	}
	225
	226	k=EVP_DecodeUpdate(&(ctx->base64),
	227	(unsigned char *)ctx->buf,
	228	&num,p,q-p);
	229	if ((k <= 0) && (num == 0) && (ctx->start))
	230	EVP_DecodeInit(&ctx->base64);
	231	else
	232	{
	233	if (p != (unsigned char *)
	234	&(ctx->tmp[0]))
	235	{
	236	i-=(p- (unsigned char *)
	237	&(ctx->tmp[0]));
	238	for (x=0; x < i; x++)
	239	ctx->tmp[x]=p[x];
d02b48c6	240	}
4579dd5d	241	EVP_DecodeInit(&ctx->base64);
d02b48c6 RE	242	ctx->start=0;
	243	break;
	244	}
	245	p=q;
	246	}
	247
	248	/* we fell off the end without starting */
	249	if (j == i)
	250	{
	251	/* Is this is one long chunk?, if so, keep on
	252	* reading until a new line. */
	253	if (p == (unsigned char *)&(ctx->tmp[0]))
	254	{
	255	ctx->tmp_nl=1;
	256	ctx->tmp_len=0;
	257	}
	258	else if (p != q) /* finished on a '\n' */
	259	{
	260	n=q-p;
	261	for (ii=0; ii<n; ii++)
	262	ctx->tmp[ii]=p[ii];
	263	ctx->tmp_len=n;
	264	}
	265	/* else finished on a '\n' */
	266	continue;
	267	}
	268	else
	269	ctx->tmp_len=0;
	270	}
58964a49 RE	271
	272	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
	273	{
	274	int z,jj;
	275
	276	jj=(i>>2)<<2;
	277	z=EVP_DecodeBlock((unsigned char *)ctx->buf,
	278	(unsigned char *)ctx->tmp,jj);
	279	if (jj > 2)
	280	{
	281	if (ctx->tmp[jj-1] == '=')
	282	{
	283	z--;
	284	if (ctx->tmp[jj-2] == '=')
	285	z--;
	286	}
	287	}
	288	/* z is now number of output bytes and jj is the
	289	* number consumed */
	290	if (jj != i)
	291	{
	292	memcpy((unsigned char *)ctx->tmp,
	293	(unsigned char *)&(ctx->tmp[jj]),i-jj);
	294	ctx->tmp_len=i-jj;
	295	}
	296	ctx->buf_len=0;
	297	if (z > 0)
	298	{
	299	ctx->buf_len=z;
	300	i=1;
	301	}
	302	else
	303	i=z;
	304	}
	305	else
	306	{
	307	i=EVP_DecodeUpdate(&(ctx->base64),
	308	(unsigned char *)ctx->buf,&ctx->buf_len,
	309	(unsigned char *)ctx->tmp,i);
	310	}
d02b48c6 RE	311	ctx->cont=i;
	312	ctx->buf_off=0;
	313	if (i < 0)
	314	{
58964a49	315	ret_code=0;
d02b48c6 RE	316	ctx->buf_len=0;
	317	break;
	318	}
	319
	320	if (ctx->buf_len <= outl)
	321	i=ctx->buf_len;
	322	else
	323	i=outl;
	324
	325	memcpy(out,ctx->buf,i);
	326	ret+=i;
	327	ctx->buf_off=i;
	328	if (ctx->buf_off == ctx->buf_len)
	329	{
	330	ctx->buf_len=0;
	331	ctx->buf_off=0;
	332	}
	333	outl-=i;
	334	out+=i;
	335	}
	336	BIO_clear_retry_flags(b);
	337	BIO_copy_next_retry(b);
58964a49	338	return((ret == 0)?ret_code:ret);
d02b48c6 RE	339	}
d02b48c6 RE	340
6b691a5c	341	static int b64_write(BIO b, char in, int inl)
d02b48c6 RE	342	{
	343	int ret=inl,n,i;
	344	BIO_B64_CTX *ctx;
	345
	346	ctx=(BIO_B64_CTX *)b->ptr;
	347	BIO_clear_retry_flags(b);
	348
	349	if (ctx->encode != B64_ENCODE)
	350	{
	351	ctx->encode=B64_ENCODE;
	352	ctx->buf_len=0;
	353	ctx->buf_off=0;
58964a49	354	ctx->tmp_len=0;
d02b48c6 RE	355	EVP_EncodeInit(&(ctx->base64));
	356	}
	357
	358	n=ctx->buf_len-ctx->buf_off;
	359	while (n > 0)
	360	{
	361	i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
	362	if (i <= 0)
	363	{
	364	BIO_copy_next_retry(b);
	365	return(i);
	366	}
	367	ctx->buf_off+=i;
	368	n-=i;
	369	}
	370	/* at this point all pending data has been written */
	371
	372	if ((in == NULL) \|\| (inl <= 0)) return(0);
	373
	374	ctx->buf_off=0;
	375	while (inl > 0)
	376	{
	377	n=(inl > B64_BLOCK_SIZE)?B64_BLOCK_SIZE:inl;
58964a49 RE	378
	379	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
	380	{
	381	if (ctx->tmp_len > 0)
	382	{
	383	n=3-ctx->tmp_len;
	384	memcpy(&(ctx->tmp[ctx->tmp_len]),in,n);
	385	ctx->tmp_len+=n;
	386	n=ctx->tmp_len;
	387	if (n < 3)
	388	break;
	389	ctx->buf_len=EVP_EncodeBlock(
	390	(unsigned char *)ctx->buf,
	391	(unsigned char *)ctx->tmp,n);
	392	}
	393	else
	394	{
	395	if (n < 3)
	396	{
	397	memcpy(&(ctx->tmp[0]),in,n);
	398	ctx->tmp_len=n;
	399	break;
	400	}
	401	n-=n%3;
	402	ctx->buf_len=EVP_EncodeBlock(
	403	(unsigned char *)ctx->buf,
	404	(unsigned char *)in,n);
	405	}
	406	}
	407	else
	408	{
	409	EVP_EncodeUpdate(&(ctx->base64),
	410	(unsigned char *)ctx->buf,&ctx->buf_len,
	411	(unsigned char *)in,n);
	412	}
d02b48c6 RE	413	inl-=n;
	414	in+=n;
	415
	416	ctx->buf_off=0;
	417	n=ctx->buf_len;
	418	while (n > 0)
	419	{
	420	i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
	421	if (i <= 0)
	422	{
	423	BIO_copy_next_retry(b);
	424	return((ret == 0)?i:ret);
	425	}
	426	n-=i;
	427	ctx->buf_off+=i;
	428	}
	429	ctx->buf_len=0;
	430	ctx->buf_off=0;
	431	}
	432	return(ret);
	433	}
	434
6b691a5c	435	static long b64_ctrl(BIO b, int cmd, long num, char ptr)
d02b48c6 RE	436	{
	437	BIO_B64_CTX *ctx;
	438	long ret=1;
	439	int i;
	440
	441	ctx=(BIO_B64_CTX *)b->ptr;
	442
	443	switch (cmd)
	444	{
	445	case BIO_CTRL_RESET:
	446	ctx->cont=1;
	447	ctx->start=1;
	448	ctx->encode=B64_NONE;
	449	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	450	break;
	451	case BIO_CTRL_EOF: /* More to read */
	452	if (ctx->cont <= 0)
	453	ret=1;
	454	else
	455	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	456	break;
	457	case BIO_CTRL_WPENDING: /* More to write in buffer */
	458	ret=ctx->buf_len-ctx->buf_off;
	459	if ((ret == 0) && (ctx->base64.num != 0))
	460	ret=1;
	461	else if (ret <= 0)
	462	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	463	break;
	464	case BIO_CTRL_PENDING: /* More to read in buffer */
	465	ret=ctx->buf_len-ctx->buf_off;
	466	if (ret <= 0)
	467	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	468	break;
	469	case BIO_CTRL_FLUSH:
	470	/* do a final write */
	471	again:
	472	while (ctx->buf_len != ctx->buf_off)
	473	{
	474	i=b64_write(b,NULL,0);
	475	if (i < 0)
	476	{
	477	ret=i;
	478	break;
	479	}
	480	}
58964a49 RE	481	if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
	482	{
	483	if (ctx->tmp_len != 0)
	484	{
	485	ctx->buf_len=EVP_EncodeBlock(
	486	(unsigned char *)ctx->buf,
	487	(unsigned char *)ctx->tmp,
	488	ctx->tmp_len);
	489	ctx->buf_off=0;
	490	ctx->tmp_len=0;
	491	goto again;
	492	}
	493	}
	494	else if (ctx->base64.num != 0)
d02b48c6 RE	495	{
	496	ctx->buf_off=0;
	497	EVP_EncodeFinal(&(ctx->base64),
	498	(unsigned char *)ctx->buf,
	499	&(ctx->buf_len));
	500	/* push out the bytes */
	501	goto again;
	502	}
	503	/* Finally flush the underlying BIO */
	504	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	505	break;
	506
	507	case BIO_C_DO_STATE_MACHINE:
	508	BIO_clear_retry_flags(b);
	509	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	510	BIO_copy_next_retry(b);
	511	break;
	512
	513	case BIO_CTRL_DUP:
	514	break;
	515	case BIO_CTRL_INFO:
	516	case BIO_CTRL_GET:
	517	case BIO_CTRL_SET:
	518	default:
	519	ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
	520	break;
	521	}
	522	return(ret);
	523	}
	524