ref: e14d6249749a1101abdad7998e1cd5cdc49e137a
dir: /sys/src/ape/lib/openssl/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);
}