[thirdparty/openssl.git] / crypto / bio / bss_mem.c

/* crypto/bio/bss_mem.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/bio.h>

static int mem_write(BIO *h, const char *buf, int num);
static int mem_read(BIO *h, char *buf, int size);
static int mem_puts(BIO *h, const char *str);
static int mem_gets(BIO *h, char *str, int size);
static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int mem_new(BIO *h);
static int mem_free(BIO *data);
static BIO_METHOD mem_method=
	{
	BIO_TYPE_MEM,
	"memory buffer",
	mem_write,
	mem_read,
	mem_puts,
	mem_gets,
	mem_ctrl,
	mem_new,
	mem_free,
	NULL,
	};

/* bio->num is used to hold the value to return on 'empty', if it is
 * 0, should_retry is not set */

BIO_METHOD *BIO_s_mem(void)
	{
	return(&mem_method);
	}

BIO *BIO_new_mem_buf(void *buf, int len)
{
	BIO *ret;
	BUF_MEM *b;
	if (!buf) {
		BIOerr(BIO_F_BIO_NEW_MEM_BUF,BIO_R_NULL_PARAMETER);
		return NULL;
	}
	if(len == -1) len = strlen(buf);
	if(!(ret = BIO_new(BIO_s_mem())) ) return NULL;
	b = (BUF_MEM *)ret->ptr;
	b->data = buf;
	b->length = len;
	b->max = len;
	ret->flags |= BIO_FLAGS_MEM_RDONLY;
	/* Since this is static data retrying wont help */
	ret->num = 0;
	return ret;
}

static int mem_new(BIO *bi)
	{
	BUF_MEM *b;

	if ((b=BUF_MEM_new()) == NULL)
		return(0);
	bi->shutdown=1;
	bi->init=1;
	bi->num= -1;
	bi->ptr=(char *)b;
	return(1);
	}

static int mem_free(BIO *a)
	{
	if (a == NULL) return(0);
	if (a->shutdown)
		{
		if ((a->init) && (a->ptr != NULL))
			{
			BUF_MEM *b;
			b = (BUF_MEM *)a->ptr;
			if(a->flags & BIO_FLAGS_MEM_RDONLY) b->data = NULL;
			BUF_MEM_free(b);
			a->ptr=NULL;
			}
		}
	return(1);
	}
	
static int mem_read(BIO *b, char *out, int outl)
	{
	int ret= -1;
	BUF_MEM *bm;
	int i;
	char *from,*to;

	bm=(BUF_MEM *)b->ptr;
	BIO_clear_retry_flags(b);
	ret=(outl > bm->length)?bm->length:outl;
	if ((out != NULL) && (ret > 0)) {
		memcpy(out,bm->data,ret);
		bm->length-=ret;
		/* memmove(&(bm->data[0]),&(bm->data[ret]), bm->length); */
		if(b->flags & BIO_FLAGS_MEM_RDONLY) bm->data += ret;
		else {
			from=(char *)&(bm->data[ret]);
			to=(char *)&(bm->data[0]);
			for (i=0; i<bm->length; i++)
				to[i]=from[i];
		}
	} else if (bm->length == 0)
		{
		ret = b->num;
		if (ret != 0)
			BIO_set_retry_read(b);
		}
	return(ret);
	}

static int mem_write(BIO *b, const char *in, int inl)
	{
	int ret= -1;
	int blen;
	BUF_MEM *bm;

	bm=(BUF_MEM *)b->ptr;
	if (in == NULL)
		{
		BIOerr(BIO_F_MEM_WRITE,BIO_R_NULL_PARAMETER);
		goto end;
		}

	if(b->flags & BIO_FLAGS_MEM_RDONLY) {
		BIOerr(BIO_F_MEM_WRITE,BIO_R_WRITE_TO_READ_ONLY_BIO);
		goto end;
	}

	BIO_clear_retry_flags(b);
	blen=bm->length;
	if (BUF_MEM_grow_clean(bm,blen+inl) != (blen+inl))
		goto end;
	memcpy(&(bm->data[blen]),in,inl);
	ret=inl;
end:
	return(ret);
	}

static long mem_ctrl(BIO *b, int cmd, long num, void *ptr)
	{
	long ret=1;
	char **pptr;

	BUF_MEM *bm=(BUF_MEM *)b->ptr;

	switch (cmd)
		{
	case BIO_CTRL_RESET:
		if (bm->data != NULL)
			{
			/* For read only case reset to the start again */
			if(b->flags & BIO_FLAGS_MEM_RDONLY) 
				{
				bm->data -= bm->max - bm->length;
				bm->length = bm->max;
				}
			else
				{
				memset(bm->data,0,bm->max);
				bm->length=0;
				}
			}
		break;
	case BIO_CTRL_EOF:
		ret=(long)(bm->length == 0);
		break;
	case BIO_C_SET_BUF_MEM_EOF_RETURN:
		b->num=(int)num;
		break;
	case BIO_CTRL_INFO:
		ret=(long)bm->length;
		if (ptr != NULL)
			{
			pptr=(char **)ptr;
			*pptr=(char *)&(bm->data[0]);
			}
		break;
	case BIO_C_SET_BUF_MEM:
		mem_free(b);
		b->shutdown=(int)num;
		b->ptr=ptr;
		break;
	case BIO_C_GET_BUF_MEM_PTR:
		if (ptr != NULL)
			{
			pptr=(char **)ptr;
			*pptr=(char *)bm;
			}
		break;
	case BIO_CTRL_GET_CLOSE:
		ret=(long)b->shutdown;
		break;
	case BIO_CTRL_SET_CLOSE:
		b->shutdown=(int)num;
		break;

	case BIO_CTRL_WPENDING:
		ret=0L;
		break;
	case BIO_CTRL_PENDING:
		ret=(long)bm->length;
		break;
	case BIO_CTRL_DUP:
	case BIO_CTRL_FLUSH:
		ret=1;
		break;
	case BIO_CTRL_PUSH:
	case BIO_CTRL_POP:
	default:
		ret=0;
		break;
		}
	return(ret);
	}

static int mem_gets(BIO *bp, char *buf, int size)
	{
	int i,j;
	int ret= -1;
	char *p;
	BUF_MEM *bm=(BUF_MEM *)bp->ptr;

	BIO_clear_retry_flags(bp);
	j=bm->length;
	if (j <= 0)
		{
		*buf='\0';
		return 0;
		}
	p=bm->data;
	for (i=0; i<j; i++)
		{
		if (p[i] == '\n') break;
		}
	if (i == j)
		{
		BIO_set_retry_read(bp);
		/* return(-1);  change the semantics 0.6.6a */ 
		}
	else
		i++;
	/* i is the max to copy */
	if ((size-1) < i) i=size-1;
	i=mem_read(bp,buf,i);
	if (i > 0) buf[i]='\0';
	ret=i;
	return(ret);
	}

static int mem_puts(BIO *bp, const char *str)
	{
	int n,ret;

	n=strlen(str);
	ret=mem_write(bp,str,n);
	/* memory semantics is that it will always work */
	return(ret);
	}
Commit	Line	Data
d02b48c6	1	/* crypto/bio/bss_mem.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	62	#include <openssl/bio.h>
d02b48c6	63
0e1c0612 UM	64	static int mem_write(BIO h, const char buf, int num);
	65	static int mem_read(BIO h, char buf, int size);
	66	static int mem_puts(BIO h, const char str);
	67	static int mem_gets(BIO h, char str, int size);
	68	static long mem_ctrl(BIO h, int cmd, long arg1, void arg2);
d02b48c6 RE	69	static int mem_new(BIO *h);
d02b48c6 RE	70	static int mem_free(BIO *data);
d02b48c6 RE	71	static BIO_METHOD mem_method=
d02b48c6 RE	72	{
58964a49 RE	73	BIO_TYPE_MEM,
58964a49 RE	74	"memory buffer",
d02b48c6 RE	75	mem_write,
	76	mem_read,
	77	mem_puts,
	78	mem_gets,
	79	mem_ctrl,
	80	mem_new,
	81	mem_free,
d3442bc7	82	NULL,
d02b48c6 RE	83	};
d02b48c6 RE	84
dfeab068 RE	85	/* bio->num is used to hold the value to return on 'empty', if it is
	86	* 0, should_retry is not set */
	87
6b691a5c	88	BIO_METHOD *BIO_s_mem(void)
d02b48c6 RE	89	{
	90	return(&mem_method);
	91	}
	92
8484721a DSH	93	BIO BIO_new_mem_buf(void buf, int len)
	94	{
	95	BIO *ret;
	96	BUF_MEM *b;
	97	if (!buf) {
	98	BIOerr(BIO_F_BIO_NEW_MEM_BUF,BIO_R_NULL_PARAMETER);
	99	return NULL;
	100	}
	101	if(len == -1) len = strlen(buf);
	102	if(!(ret = BIO_new(BIO_s_mem())) ) return NULL;
	103	b = (BUF_MEM *)ret->ptr;
	104	b->data = buf;
	105	b->length = len;
	106	b->max = len;
	107	ret->flags \|= BIO_FLAGS_MEM_RDONLY;
	108	/* Since this is static data retrying wont help */
	109	ret->num = 0;
	110	return ret;
	111	}
	112
6b691a5c	113	static int mem_new(BIO *bi)
d02b48c6 RE	114	{
	115	BUF_MEM *b;
	116
	117	if ((b=BUF_MEM_new()) == NULL)
	118	return(0);
	119	bi->shutdown=1;
	120	bi->init=1;
dfeab068	121	bi->num= -1;
d02b48c6 RE	122	bi->ptr=(char *)b;
	123	return(1);
	124	}
	125
6b691a5c	126	static int mem_free(BIO *a)
d02b48c6 RE	127	{
	128	if (a == NULL) return(0);
	129	if (a->shutdown)
	130	{
	131	if ((a->init) && (a->ptr != NULL))
	132	{
8484721a DSH	133	BUF_MEM *b;
	134	b = (BUF_MEM *)a->ptr;
	135	if(a->flags & BIO_FLAGS_MEM_RDONLY) b->data = NULL;
	136	BUF_MEM_free(b);
d02b48c6 RE	137	a->ptr=NULL;
	138	}
	139	}
	140	return(1);
	141	}
	142
6b691a5c	143	static int mem_read(BIO b, char out, int outl)
d02b48c6 RE	144	{
	145	int ret= -1;
	146	BUF_MEM *bm;
	147	int i;
	148	char from,to;
	149
	150	bm=(BUF_MEM *)b->ptr;
	151	BIO_clear_retry_flags(b);
	152	ret=(outl > bm->length)?bm->length:outl;
8484721a	153	if ((out != NULL) && (ret > 0)) {
d02b48c6 RE	154	memcpy(out,bm->data,ret);
	155	bm->length-=ret;
	156	/* memmove(&(bm->data[0]),&(bm->data[ret]), bm->length); */
8484721a DSH	157	if(b->flags & BIO_FLAGS_MEM_RDONLY) bm->data += ret;
	158	else {
	159	from=(char *)&(bm->data[ret]);
	160	to=(char *)&(bm->data[0]);
	161	for (i=0; i<bm->length; i++)
	162	to[i]=from[i];
d02b48c6	163	}
8484721a	164	} else if (bm->length == 0)
d02b48c6	165	{
55ac5220 BM	166	ret = b->num;
55ac5220 BM	167	if (ret != 0)
dfeab068	168	BIO_set_retry_read(b);
d02b48c6 RE	169	}
	170	return(ret);
	171	}
	172
0e1c0612	173	static int mem_write(BIO b, const char in, int inl)
d02b48c6 RE	174	{
	175	int ret= -1;
	176	int blen;
	177	BUF_MEM *bm;
	178
	179	bm=(BUF_MEM *)b->ptr;
	180	if (in == NULL)
	181	{
	182	BIOerr(BIO_F_MEM_WRITE,BIO_R_NULL_PARAMETER);
	183	goto end;
	184	}
	185
8484721a DSH	186	if(b->flags & BIO_FLAGS_MEM_RDONLY) {
	187	BIOerr(BIO_F_MEM_WRITE,BIO_R_WRITE_TO_READ_ONLY_BIO);
	188	goto end;
	189	}
	190
d02b48c6 RE	191	BIO_clear_retry_flags(b);
d02b48c6 RE	192	blen=bm->length;
54a656ef	193	if (BUF_MEM_grow_clean(bm,blen+inl) != (blen+inl))
d02b48c6 RE	194	goto end;
	195	memcpy(&(bm->data[blen]),in,inl);
	196	ret=inl;
	197	end:
	198	return(ret);
	199	}
	200
0e1c0612	201	static long mem_ctrl(BIO b, int cmd, long num, void ptr)
d02b48c6 RE	202	{
	203	long ret=1;
	204	char **pptr;
	205
	206	BUF_MEM bm=(BUF_MEM )b->ptr;
	207
	208	switch (cmd)
	209	{
	210	case BIO_CTRL_RESET:
ccc265ea BM	211	if (bm->data != NULL)
ccc265ea BM	212	{
8484721a DSH	213	/* For read only case reset to the start again */
8484721a DSH	214	if(b->flags & BIO_FLAGS_MEM_RDONLY)
ccc265ea BM	215	{
	216	bm->data -= bm->max - bm->length;
	217	bm->length = bm->max;
	218	}
	219	else
	220	{
8484721a DSH	221	memset(bm->data,0,bm->max);
8484721a DSH	222	bm->length=0;
ccc265ea	223	}
8484721a	224	}
d02b48c6 RE	225	break;
	226	case BIO_CTRL_EOF:
	227	ret=(long)(bm->length == 0);
	228	break;
dfeab068 RE	229	case BIO_C_SET_BUF_MEM_EOF_RETURN:
	230	b->num=(int)num;
	231	break;
d02b48c6 RE	232	case BIO_CTRL_INFO:
	233	ret=(long)bm->length;
	234	if (ptr != NULL)
	235	{
	236	pptr=(char **)ptr;
	237	pptr=(char )&(bm->data[0]);
	238	}
	239	break;
	240	case BIO_C_SET_BUF_MEM:
	241	mem_free(b);
	242	b->shutdown=(int)num;
	243	b->ptr=ptr;
	244	break;
	245	case BIO_C_GET_BUF_MEM_PTR:
	246	if (ptr != NULL)
	247	{
	248	pptr=(char **)ptr;
	249	pptr=(char )bm;
	250	}
	251	break;
	252	case BIO_CTRL_GET_CLOSE:
	253	ret=(long)b->shutdown;
	254	break;
	255	case BIO_CTRL_SET_CLOSE:
	256	b->shutdown=(int)num;
	257	break;
	258
	259	case BIO_CTRL_WPENDING:
	260	ret=0L;
	261	break;
	262	case BIO_CTRL_PENDING:
	263	ret=(long)bm->length;
	264	break;
	265	case BIO_CTRL_DUP:
	266	case BIO_CTRL_FLUSH:
	267	ret=1;
	268	break;
	269	case BIO_CTRL_PUSH:
	270	case BIO_CTRL_POP:
	271	default:
	272	ret=0;
	273	break;
	274	}
	275	return(ret);
	276	}
	277
6b691a5c	278	static int mem_gets(BIO bp, char buf, int size)
d02b48c6 RE	279	{
	280	int i,j;
	281	int ret= -1;
	282	char *p;
	283	BUF_MEM bm=(BUF_MEM )bp->ptr;
	284
	285	BIO_clear_retry_flags(bp);
	286	j=bm->length;
54a656ef BL	287	if (j <= 0)
	288	{
	289	*buf='\0';
	290	return 0;
	291	}
d02b48c6 RE	292	p=bm->data;
	293	for (i=0; i<j; i++)
	294	{
	295	if (p[i] == '\n') break;
	296	}
	297	if (i == j)
	298	{
	299	BIO_set_retry_read(bp);
	300	/* return(-1); change the semantics 0.6.6a */
	301	}
	302	else
	303	i++;
	304	/* i is the max to copy */
	305	if ((size-1) < i) i=size-1;
	306	i=mem_read(bp,buf,i);
	307	if (i > 0) buf[i]='\0';
	308	ret=i;
	309	return(ret);
	310	}
	311
0e1c0612	312	static int mem_puts(BIO bp, const char str)
d02b48c6 RE	313	{
	314	int n,ret;
	315
	316	n=strlen(str);
	317	ret=mem_write(bp,str,n);
	318	/* memory semantics is that it will always work */
	319	return(ret);
	320	}
	321