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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)));
      }


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