bss_mem.c
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- /* 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=' ';
- 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]=' ';
- 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);
- }