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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;
      size_t sz;

      if (!buf) {
            BIOerr(BIO_F_BIO_NEW_MEM_BUF,BIO_R_NULL_PARAMETER);
            return NULL;
      }
      sz = (len<0) ? strlen(buf) : (size_t)len;
      if(!(ret = BIO_new(BIO_s_mem())) ) return NULL;
      b = (BUF_MEM *)ret->ptr;
      b->data = buf;
      b->length = sz;
      b->max = sz;
      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;

      bm=(BUF_MEM *)b->ptr;
      BIO_clear_retry_flags(b);
      ret=(outl >=0 && (size_t)outl > bm->length)?(int)bm->length:outl;
      if ((out != NULL) && (ret > 0)) {
            memcpy(out,bm->data,ret);
            bm->length-=ret;
            if(b->flags & BIO_FLAGS_MEM_RDONLY) bm->data += ret;
            else {
                  memmove(&(bm->data[0]),&(bm->data[ret]),bm->length);
            }
      } 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 ((size-1) < j) j=size-1;
      if (j <= 0)
            {
            *buf='\0';
            return 0;
            }
      p=bm->data;
      for (i=0; i<j; i++)
            {
            if (p[i] == '\n')
                  {
                  i++;
                  break;
                  }
            }

      /*
       * i is now the max num of bytes to copy, either j or up to
       * and including the first newline
       */ 

      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);
      }


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