125 lines
4.1 KiB
C
125 lines
4.1 KiB
C
/**
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* \file memory.h
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*
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* \brief Memory allocation layer
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*
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* Copyright (C) 2006-2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_MEMORY_H
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#define POLARSSL_MEMORY_H
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#include "config.h"
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#include <stdlib.h>
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#if !defined(POLARSSL_CONFIG_OPTIONS)
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#define POLARSSL_MEMORY_ALIGN_MULTIPLE 4 /**< Align on multiples of this value */
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#define POLARSSL_MEMORY_STDMALLOC malloc /**< Default allocator to use, can be undefined */
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#define POLARSSL_MEMORY_STDFREE free /**< Default free to use, can be undefined */
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#endif /* POLARSSL_CONFIG_OPTIONS */
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#define MEMORY_VERIFY_NONE 0
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#define MEMORY_VERIFY_ALLOC (1 << 0)
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#define MEMORY_VERIFY_FREE (1 << 1)
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#define MEMORY_VERIFY_ALWAYS (MEMORY_VERIFY_ALLOC | MEMORY_VERIFY_FREE)
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* The function pointers for malloc and free
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*/
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extern void * (*polarssl_malloc)( size_t len );
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extern void (*polarssl_free)( void *ptr );
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/**
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* \brief Set your own memory implementation function pointers
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*
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* \param malloc_func the malloc function implementation
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* \param free_func the free function implementation
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*
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* \return 0 if successful
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*/
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int memory_set_own( void * (*malloc_func)( size_t ),
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void (*free_func)( void * ) );
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#if defined(POLARSSL_MEMORY_BUFFER_ALLOC_C)
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/**
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* \brief Initialize use of stack-based memory allocator.
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* The stack-based allocator does memory management inside the
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* presented buffer and does not call malloc() and free().
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* It sets the global polarssl_malloc() and polarssl_free() pointers
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* to its own functions.
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*
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* \note This code is not optimized and provides a straight-forward
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* implementation of a stack-based memory allocator.
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*
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* \param buf buffer to use as heap
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* \param len size of the buffer
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*
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* \return 0 if successful
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*/
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int memory_buffer_alloc_init( unsigned char *buf, size_t len );
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/**
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* \brief Determine when the allocator should automatically verify the state
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* of the entire chain of headers / meta-data.
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* (Default: MEMORY_VERIFY_NONE)
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*
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* \param verify One of MEMORY_VERIFY_NONE, MEMORY_VERIFY_ALLOC,
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* MEMORY_VERIFY_FREE or MEMORY_VERIFY_ALWAYS
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*/
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void memory_buffer_set_verify( int verify );
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#if defined(POLARSSL_MEMORY_DEBUG)
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/**
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* \brief Print out the status of the allocated memory (primarily for use
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* after a program should have de-allocated all memory)
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* Prints out a list of 'still allocated' blocks and their stack
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* trace if POLARSSL_MEMORY_BACKTRACE is defined.
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*/
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void memory_buffer_alloc_status();
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#endif /* POLARSSL_MEMORY_DEBUG */
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/**
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* \brief Verifies that all headers in the memory buffer are correct
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* and contain sane values. Helps debug buffer-overflow errors.
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*
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* Prints out first failure if POLARSSL_MEMORY_DEBUG is defined.
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* Prints out full header information if POLARSSL_MEMORY_DEBUG_HEADERS
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* is defined. (Includes stack trace information for each block if
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* POLARSSL_MEMORY_BACKTRACE is defined as well).
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*
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* \returns 0 if verified, 1 otherwise
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*/
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int memory_buffer_alloc_verify();
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#endif /* POLARSSL_MEMORY_BUFFER_ALLOC_C */
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#ifdef __cplusplus
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}
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#endif
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#endif /* memory.h */
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