ref: 9e09742e9b5789a94b7676ff5f4e01468d2f2d88
dir: /sys/src/ape/lib/openssl/crypto/bio/bf_buff.c/
/* crypto/bio/bf_buff.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 buffer_write(BIO *h, const char *buf,int num);
static int buffer_read(BIO *h, char *buf, int size);
static int buffer_puts(BIO *h, const char *str);
static int buffer_gets(BIO *h, char *str, int size);
static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int buffer_new(BIO *h);
static int buffer_free(BIO *data);
static long buffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
#define DEFAULT_BUFFER_SIZE 4096
static BIO_METHOD methods_buffer=
{
BIO_TYPE_BUFFER,
"buffer",
buffer_write,
buffer_read,
buffer_puts,
buffer_gets,
buffer_ctrl,
buffer_new,
buffer_free,
buffer_callback_ctrl,
};
BIO_METHOD *BIO_f_buffer(void)
{
return(&methods_buffer);
}
static int buffer_new(BIO *bi)
{
BIO_F_BUFFER_CTX *ctx;
ctx=(BIO_F_BUFFER_CTX *)OPENSSL_malloc(sizeof(BIO_F_BUFFER_CTX));
if (ctx == NULL) return(0);
ctx->ibuf=(char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
if (ctx->ibuf == NULL) { OPENSSL_free(ctx); return(0); }
ctx->obuf=(char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
if (ctx->obuf == NULL) { OPENSSL_free(ctx->ibuf); OPENSSL_free(ctx); return(0); }
ctx->ibuf_size=DEFAULT_BUFFER_SIZE;
ctx->obuf_size=DEFAULT_BUFFER_SIZE;
ctx->ibuf_len=0;
ctx->ibuf_off=0;
ctx->obuf_len=0;
ctx->obuf_off=0;
bi->init=1;
bi->ptr=(char *)ctx;
bi->flags=0;
return(1);
}
static int buffer_free(BIO *a)
{
BIO_F_BUFFER_CTX *b;
if (a == NULL) return(0);
b=(BIO_F_BUFFER_CTX *)a->ptr;
if (b->ibuf != NULL) OPENSSL_free(b->ibuf);
if (b->obuf != NULL) OPENSSL_free(b->obuf);
OPENSSL_free(a->ptr);
a->ptr=NULL;
a->init=0;
a->flags=0;
return(1);
}
static int buffer_read(BIO *b, char *out, int outl)
{
int i,num=0;
BIO_F_BUFFER_CTX *ctx;
if (out == NULL) return(0);
ctx=(BIO_F_BUFFER_CTX *)b->ptr;
if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
num=0;
BIO_clear_retry_flags(b);
start:
i=ctx->ibuf_len;
/* If there is stuff left over, grab it */
if (i != 0)
{
if (i > outl) i=outl;
memcpy(out,&(ctx->ibuf[ctx->ibuf_off]),i);
ctx->ibuf_off+=i;
ctx->ibuf_len-=i;
num+=i;
if (outl == i) return(num);
outl-=i;
out+=i;
}
/* We may have done a partial read. try to do more.
* We have nothing in the buffer.
* If we get an error and have read some data, just return it
* and let them retry to get the error again.
* copy direct to parent address space */
if (outl > ctx->ibuf_size)
{
for (;;)
{
i=BIO_read(b->next_bio,out,outl);
if (i <= 0)
{
BIO_copy_next_retry(b);
if (i < 0) return((num > 0)?num:i);
if (i == 0) return(num);
}
num+=i;
if (outl == i) return(num);
out+=i;
outl-=i;
}
}
/* else */
/* we are going to be doing some buffering */
i=BIO_read(b->next_bio,ctx->ibuf,ctx->ibuf_size);
if (i <= 0)
{
BIO_copy_next_retry(b);
if (i < 0) return((num > 0)?num:i);
if (i == 0) return(num);
}
ctx->ibuf_off=0;
ctx->ibuf_len=i;
/* Lets re-read using ourselves :-) */
goto start;
}
static int buffer_write(BIO *b, const char *in, int inl)
{
int i,num=0;
BIO_F_BUFFER_CTX *ctx;
if ((in == NULL) || (inl <= 0)) return(0);
ctx=(BIO_F_BUFFER_CTX *)b->ptr;
if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
BIO_clear_retry_flags(b);
start:
i=ctx->obuf_size-(ctx->obuf_len+ctx->obuf_off);
/* add to buffer and return */
if (i >= inl)
{
memcpy(&(ctx->obuf[ctx->obuf_len]),in,inl);
ctx->obuf_len+=inl;
return(num+inl);
}
/* else */
/* stuff already in buffer, so add to it first, then flush */
if (ctx->obuf_len != 0)
{
if (i > 0) /* lets fill it up if we can */
{
memcpy(&(ctx->obuf[ctx->obuf_len]),in,i);
in+=i;
inl-=i;
num+=i;
ctx->obuf_len+=i;
}
/* we now have a full buffer needing flushing */
for (;;)
{
i=BIO_write(b->next_bio,&(ctx->obuf[ctx->obuf_off]),
ctx->obuf_len);
if (i <= 0)
{
BIO_copy_next_retry(b);
if (i < 0) return((num > 0)?num:i);
if (i == 0) return(num);
}
ctx->obuf_off+=i;
ctx->obuf_len-=i;
if (ctx->obuf_len == 0) break;
}
}
/* we only get here if the buffer has been flushed and we
* still have stuff to write */
ctx->obuf_off=0;
/* we now have inl bytes to write */
while (inl >= ctx->obuf_size)
{
i=BIO_write(b->next_bio,in,inl);
if (i <= 0)
{
BIO_copy_next_retry(b);
if (i < 0) return((num > 0)?num:i);
if (i == 0) return(num);
}
num+=i;
in+=i;
inl-=i;
if (inl == 0) return(num);
}
/* copy the rest into the buffer since we have only a small
* amount left */
goto start;
}
static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr)
{
BIO *dbio;
BIO_F_BUFFER_CTX *ctx;
long ret=1;
char *p1,*p2;
int r,i,*ip;
int ibs,obs;
ctx=(BIO_F_BUFFER_CTX *)b->ptr;
switch (cmd)
{
case BIO_CTRL_RESET:
ctx->ibuf_off=0;
ctx->ibuf_len=0;
ctx->obuf_off=0;
ctx->obuf_len=0;
if (b->next_bio == NULL) return(0);
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
case BIO_CTRL_INFO:
ret=(long)ctx->obuf_len;
break;
case BIO_C_GET_BUFF_NUM_LINES:
ret=0;
p1=ctx->ibuf;
for (i=ctx->ibuf_off; i<ctx->ibuf_len; i++)
{
if (p1[i] == '\n') ret++;
}
break;
case BIO_CTRL_WPENDING:
ret=(long)ctx->obuf_len;
if (ret == 0)
{
if (b->next_bio == NULL) return(0);
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
}
break;
case BIO_CTRL_PENDING:
ret=(long)ctx->ibuf_len;
if (ret == 0)
{
if (b->next_bio == NULL) return(0);
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
}
break;
case BIO_C_SET_BUFF_READ_DATA:
if (num > ctx->ibuf_size)
{
p1=OPENSSL_malloc((int)num);
if (p1 == NULL) goto malloc_error;
if (ctx->ibuf != NULL) OPENSSL_free(ctx->ibuf);
ctx->ibuf=p1;
}
ctx->ibuf_off=0;
ctx->ibuf_len=(int)num;
memcpy(ctx->ibuf,ptr,(int)num);
ret=1;
break;
case BIO_C_SET_BUFF_SIZE:
if (ptr != NULL)
{
ip=(int *)ptr;
if (*ip == 0)
{
ibs=(int)num;
obs=ctx->obuf_size;
}
else /* if (*ip == 1) */
{
ibs=ctx->ibuf_size;
obs=(int)num;
}
}
else
{
ibs=(int)num;
obs=(int)num;
}
p1=ctx->ibuf;
p2=ctx->obuf;
if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size))
{
p1=(char *)OPENSSL_malloc((int)num);
if (p1 == NULL) goto malloc_error;
}
if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size))
{
p2=(char *)OPENSSL_malloc((int)num);
if (p2 == NULL)
{
if (p1 != ctx->ibuf) OPENSSL_free(p1);
goto malloc_error;
}
}
if (ctx->ibuf != p1)
{
OPENSSL_free(ctx->ibuf);
ctx->ibuf=p1;
ctx->ibuf_off=0;
ctx->ibuf_len=0;
ctx->ibuf_size=ibs;
}
if (ctx->obuf != p2)
{
OPENSSL_free(ctx->obuf);
ctx->obuf=p2;
ctx->obuf_off=0;
ctx->obuf_len=0;
ctx->obuf_size=obs;
}
break;
case BIO_C_DO_STATE_MACHINE:
if (b->next_bio == NULL) return(0);
BIO_clear_retry_flags(b);
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
BIO_copy_next_retry(b);
break;
case BIO_CTRL_FLUSH:
if (b->next_bio == NULL) return(0);
if (ctx->obuf_len <= 0)
{
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
}
for (;;)
{
BIO_clear_retry_flags(b);
if (ctx->obuf_len > ctx->obuf_off)
{
r=BIO_write(b->next_bio,
&(ctx->obuf[ctx->obuf_off]),
ctx->obuf_len-ctx->obuf_off);
#if 0
fprintf(stderr,"FLUSH [%3d] %3d -> %3d\n",ctx->obuf_off,ctx->obuf_len-ctx->obuf_off,r);
#endif
BIO_copy_next_retry(b);
if (r <= 0) return((long)r);
ctx->obuf_off+=r;
}
else
{
ctx->obuf_len=0;
ctx->obuf_off=0;
ret=1;
break;
}
}
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
case BIO_CTRL_DUP:
dbio=(BIO *)ptr;
if ( !BIO_set_read_buffer_size(dbio,ctx->ibuf_size) ||
!BIO_set_write_buffer_size(dbio,ctx->obuf_size))
ret=0;
break;
default:
if (b->next_bio == NULL) return(0);
ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
break;
}
return(ret);
malloc_error:
BIOerr(BIO_F_BUFFER_CTRL,ERR_R_MALLOC_FAILURE);
return(0);
}
static long buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *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);
}
static int buffer_gets(BIO *b, char *buf, int size)
{
BIO_F_BUFFER_CTX *ctx;
int num=0,i,flag;
char *p;
ctx=(BIO_F_BUFFER_CTX *)b->ptr;
size--; /* reserve space for a '\0' */
BIO_clear_retry_flags(b);
for (;;)
{
if (ctx->ibuf_len > 0)
{
p= &(ctx->ibuf[ctx->ibuf_off]);
flag=0;
for (i=0; (i<ctx->ibuf_len) && (i<size); i++)
{
*(buf++)=p[i];
if (p[i] == '\n')
{
flag=1;
i++;
break;
}
}
num+=i;
size-=i;
ctx->ibuf_len-=i;
ctx->ibuf_off+=i;
if (flag || size == 0)
{
*buf='\0';
return(num);
}
}
else /* read another chunk */
{
i=BIO_read(b->next_bio,ctx->ibuf,ctx->ibuf_size);
if (i <= 0)
{
BIO_copy_next_retry(b);
*buf='\0';
if (i < 0) return((num > 0)?num:i);
if (i == 0) return(num);
}
ctx->ibuf_len=i;
ctx->ibuf_off=0;
}
}
}
static int buffer_puts(BIO *b, const char *str)
{
return(buffer_write(b,str,strlen(str)));
}