src/third_party/openssl/openssl/crypto/bio/bss_mem.c - cobalt - 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 <openssl/opensslconf.h>
 #if !defined(OPENSSL_SYS_STARBOARD)
 #include <errno.h>
 #include <stdio.h>
 #endif  // !defined(OPENSSL_SYS_STARBOARD)
 #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) ? OPENSSL_port_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)) {
         OPENSSL_port_memcpy(out, bm->data, ret);
         bm->length -= ret;
         if (b->flags & BIO_FLAGS_MEM_RDONLY)
             bm->data += ret;
         else {
             OPENSSL_port_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;
     OPENSSL_port_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 {
                 OPENSSL_port_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 = OPENSSL_port_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 <openssl/opensslconf.h>
	#if !defined(OPENSSL_SYS_STARBOARD)
	#include <errno.h>
	#include <stdio.h>
	#endif // !defined(OPENSSL_SYS_STARBOARD)
	#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) ? OPENSSL_port_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)) {
	OPENSSL_port_memcpy(out, bm->data, ret);
	bm->length -= ret;
	if (b->flags & BIO_FLAGS_MEM_RDONLY)
	bm->data += ret;
	else {
	OPENSSL_port_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;
	OPENSSL_port_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 {
	OPENSSL_port_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 = OPENSSL_port_strlen(str);
	ret = mem_write(bp, str, n);
	/* memory semantics is that it will always work */
	return (ret);
	}