openssl/crypto/bio/bss_mem.c - chromium/deps/openssl - Git at Google

 /* 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);
 	}
	/* 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);
	}