154 lines
5.1 KiB
C
154 lines
5.1 KiB
C
/**
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* \file memory_buffer_alloc.h
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*
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* \brief Buffer-based memory allocator
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBEDTLS_MEMORY_BUFFER_ALLOC_H
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#define MBEDTLS_MEMORY_BUFFER_ALLOC_H
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#include "mbedtls/build_info.h"
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#include <stddef.h>
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/**
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* \name SECTION: Module settings
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*
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* The configuration options you can set for this module are in this section.
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* Either change them in mbedtls_config.h or define them on the compiler command line.
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* \{
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*/
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#if !defined(MBEDTLS_MEMORY_ALIGN_MULTIPLE)
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#define MBEDTLS_MEMORY_ALIGN_MULTIPLE 4 /**< Align on multiples of this value */
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#endif
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/** \} name SECTION: Module settings */
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#define MBEDTLS_MEMORY_VERIFY_NONE 0
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#define MBEDTLS_MEMORY_VERIFY_ALLOC (1 << 0)
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#define MBEDTLS_MEMORY_VERIFY_FREE (1 << 1)
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#define MBEDTLS_MEMORY_VERIFY_ALWAYS (MBEDTLS_MEMORY_VERIFY_ALLOC | \
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MBEDTLS_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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* \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 calloc() and free().
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* It sets the global mbedtls_calloc() and mbedtls_free() pointers
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* to its own functions.
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* (Provided mbedtls_calloc() and mbedtls_free() are thread-safe if
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* MBEDTLS_THREADING_C is defined)
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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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void mbedtls_memory_buffer_alloc_init(unsigned char *buf, size_t len);
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/**
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* \brief Free the mutex for thread-safety and clear remaining memory
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*/
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void mbedtls_memory_buffer_alloc_free(void);
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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: MBEDTLS_MEMORY_VERIFY_NONE)
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*
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* \param verify One of MBEDTLS_MEMORY_VERIFY_NONE, MBEDTLS_MEMORY_VERIFY_ALLOC,
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* MBEDTLS_MEMORY_VERIFY_FREE or MBEDTLS_MEMORY_VERIFY_ALWAYS
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*/
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void mbedtls_memory_buffer_set_verify(int verify);
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#if defined(MBEDTLS_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 MBEDTLS_MEMORY_BACKTRACE is defined.
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*/
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void mbedtls_memory_buffer_alloc_status(void);
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/**
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* \brief Get the number of alloc/free so far.
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*
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* \param alloc_count Number of allocations.
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* \param free_count Number of frees.
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*/
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void mbedtls_memory_buffer_alloc_count_get(size_t *alloc_count, size_t *free_count);
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/**
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* \brief Get the peak heap usage so far
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*
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* \param max_used Peak number of bytes in use or committed. This
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* includes bytes in allocated blocks too small to split
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* into smaller blocks but larger than the requested size.
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* \param max_blocks Peak number of blocks in use, including free and used
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*/
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void mbedtls_memory_buffer_alloc_max_get(size_t *max_used, size_t *max_blocks);
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/**
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* \brief Reset peak statistics
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*/
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void mbedtls_memory_buffer_alloc_max_reset(void);
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/**
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* \brief Get the current heap usage
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*
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* \param cur_used Current number of bytes in use or committed. This
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* includes bytes in allocated blocks too small to split
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* into smaller blocks but larger than the requested size.
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* \param cur_blocks Current number of blocks in use, including free and used
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*/
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void mbedtls_memory_buffer_alloc_cur_get(size_t *cur_used, size_t *cur_blocks);
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#endif /* MBEDTLS_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 MBEDTLS_MEMORY_DEBUG is defined.
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* Prints out full header information if MBEDTLS_MEMORY_DEBUG
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* is defined. (Includes stack trace information for each block if
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* MBEDTLS_MEMORY_BACKTRACE is defined as well).
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*
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* \return 0 if verified, 1 otherwise
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*/
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int mbedtls_memory_buffer_alloc_verify(void);
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#if defined(MBEDTLS_SELF_TEST)
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/**
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* \brief Checkup routine
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*
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* \return 0 if successful, or 1 if a test failed
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*/
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int mbedtls_memory_buffer_alloc_self_test(int verbose);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* memory_buffer_alloc.h */
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