crypto/bio/bss_mem.c

   1 /* crypto/bio/bss_mem.c */
   2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
   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"
  62 #include "bio.h"
  63
  64 #ifndef NOPROTO
  65 static int mem_write(BIO *h,char *buf,int num);
  66 static int mem_read(BIO *h,char *buf,int size);
  67 static int mem_puts(BIO *h,char *str);
  68 static int mem_gets(BIO *h,char *str,int size);
  69 static long mem_ctrl(BIO *h,int cmd,long arg1,char *arg2);
  70 static int mem_new(BIO *h);
  71 static int mem_free(BIO *data);
  72 #else
  73 static int mem_write();
  74 static int mem_read();
  75 static int mem_puts();
  76 static int mem_gets();
  77 static long mem_ctrl();
  78 static int mem_new();
  79 static int mem_free();
  80 #endif
  81
  82 static BIO_METHOD mem_method=
  83         {
  84         BIO_TYPE_MEM,"memory buffer",
  85         mem_write,
  86         mem_read,
  87         mem_puts,
  88         mem_gets,
  89         mem_ctrl,
  90         mem_new,
  91         mem_free,
  92         };
  93
  94 BIO_METHOD *BIO_s_mem()
  95         {
  96         return(&mem_method);
  97         }
  98
  99 static int mem_new(bi)
 100 BIO *bi;
 101         {
 102         BUF_MEM *b;
 103
 104         if ((b=BUF_MEM_new()) == NULL)
 105                 return(0);
 106         bi->shutdown=1;
 107         bi->init=1;
 108         bi->num=0;
 109         bi->ptr=(char *)b;
 110         return(1);
 111         }
 112
 113 static int mem_free(a)
 114 BIO *a;
 115         {
 116         if (a == NULL) return(0);
 117         if (a->shutdown)
 118                 {
 119                 if ((a->init) && (a->ptr != NULL))
 120                         {
 121                         BUF_MEM_free((BUF_MEM *)a->ptr);
 122                         a->ptr=NULL;
 123                         }
 124                 }
 125         return(1);
 126         }
 127
 128 static int mem_read(b,out,outl)
 129 BIO *b;
 130 char *out;
 131 int outl;
 132         {
 133         int ret= -1;
 134         BUF_MEM *bm;
 135         int i;
 136         char *from,*to;
 137
 138         bm=(BUF_MEM *)b->ptr;
 139         BIO_clear_retry_flags(b);
 140         ret=(outl > bm->length)?bm->length:outl;
 141         if ((out != NULL) && (ret > 0))
 142                 {
 143                 memcpy(out,bm->data,ret);
 144                 bm->length-=ret;
 145                 /* memmove(&(bm->data[0]),&(bm->data[ret]), bm->length); */
 146                 from=(char *)&(bm->data[ret]);
 147                 to=(char *)&(bm->data[0]);
 148                 for (i=0; i<bm->length; i++)
 149                         to[i]=from[i];
 150                 }
 151         else if (bm->length == 0)
 152                 {
 153                 BIO_set_retry_read(b);
 154                 ret= -1;
 155                 }
 156         return(ret);
 157         }
 158
 159 static int mem_write(b,in,inl)
 160 BIO *b;
 161 char *in;
 162 int inl;
 163         {
 164         int ret= -1;
 165         int blen;
 166         BUF_MEM *bm;
 167
 168         bm=(BUF_MEM *)b->ptr;
 169         if (in == NULL)
 170                 {
 171                 BIOerr(BIO_F_MEM_WRITE,BIO_R_NULL_PARAMETER);
 172                 goto end;
 173                 }
 174
 175         BIO_clear_retry_flags(b);
 176         blen=bm->length;
 177         if (BUF_MEM_grow(bm,blen+inl) != (blen+inl))
 178                 goto end;
 179         memcpy(&(bm->data[blen]),in,inl);
 180         ret=inl;
 181 end:
 182         return(ret);
 183         }
 184
 185 static long mem_ctrl(b,cmd,num,ptr)
 186 BIO *b;
 187 int cmd;
 188 long num;
 189 char *ptr;
 190         {
 191         long ret=1;
 192         char **pptr;
 193
 194         BUF_MEM *bm=(BUF_MEM *)b->ptr;
 195
 196         switch (cmd)
 197                 {
 198         case BIO_CTRL_RESET:
 199                 if (bm->data != NULL)
 200                         memset(bm->data,0,bm->max);
 201                 bm->length=0;
 202                 break;
 203         case BIO_CTRL_EOF:
 204                 ret=(long)(bm->length == 0);
 205                 break;
 206         case BIO_CTRL_INFO:
 207                 ret=(long)bm->length;
 208                 if (ptr != NULL)
 209                         {
 210                         pptr=(char **)ptr;
 211                         *pptr=(char *)&(bm->data[0]);
 212                         }
 213                 break;
 214         case BIO_C_SET_BUF_MEM:
 215                 mem_free(b);
 216                 b->shutdown=(int)num;
 217                 b->ptr=ptr;
 218                 break;
 219         case BIO_C_GET_BUF_MEM_PTR:
 220                 if (ptr != NULL)
 221                         {
 222                         pptr=(char **)ptr;
 223                         *pptr=(char *)bm;
 224                         }
 225                 break;
 226         case BIO_CTRL_GET_CLOSE:
 227                 ret=(long)b->shutdown;
 228                 break;
 229         case BIO_CTRL_SET_CLOSE:
 230                 b->shutdown=(int)num;
 231                 break;
 232
 233         case BIO_CTRL_WPENDING:
 234                 ret=0L;
 235                 break;
 236         case BIO_CTRL_PENDING:
 237                 ret=(long)bm->length;
 238                 break;
 239         case BIO_CTRL_DUP:
 240         case BIO_CTRL_FLUSH:
 241                 ret=1;
 242                 break;
 243         case BIO_CTRL_PUSH:
 244         case BIO_CTRL_POP:
 245         default:
 246                 ret=0;
 247                 break;
 248                 }
 249         return(ret);
 250         }
 251
 252 static int mem_gets(bp,buf,size)
 253 BIO *bp;
 254 char *buf;
 255 int size;
 256         {
 257         int i,j;
 258         int ret= -1;
 259         char *p;
 260         BUF_MEM *bm=(BUF_MEM *)bp->ptr;
 261
 262         BIO_clear_retry_flags(bp);
 263         j=bm->length;
 264         if (j <= 0) return(0);
 265         p=bm->data;
 266         for (i=0; i<j; i++)
 267                 {
 268                 if (p[i] == '\n') break;
 269                 }
 270         if (i == j)
 271                 {
 272                 BIO_set_retry_read(bp);
 273                 /* return(-1);  change the semantics 0.6.6a */
 274                 }
 275         else
 276                 i++;
 277         /* i is the max to copy */
 278         if ((size-1) < i) i=size-1;
 279         i=mem_read(bp,buf,i);
 280         if (i > 0) buf[i]='\0';
 281         ret=i;
 282         return(ret);
 283         }
 284
 285 static int mem_puts(bp,str)
 286 BIO *bp;
 287 char *str;
 288         {
 289         int n,ret;
 290
 291         n=strlen(str);
 292         ret=mem_write(bp,str,n);
 293         /* memory semantics is that it will always work */
 294         return(ret);
 295         }
 296