2 * \file memory_buffer_alloc.h
4 * \brief Buffer-based memory allocator
7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
8 * SPDX-License-Identifier: Apache-2.0
10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
11 * not use this file except in compliance with the License.
12 * You may obtain a copy of the License at
14 * http://www.apache.org/licenses/LICENSE-2.0
16 * Unless required by applicable law or agreed to in writing, software
17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19 * See the License for the specific language governing permissions and
20 * limitations under the License.
22 * This file is part of mbed TLS (https://tls.mbed.org)
24 #ifndef MBEDTLS_MEMORY_BUFFER_ALLOC_H
25 #define MBEDTLS_MEMORY_BUFFER_ALLOC_H
27 #if !defined(MBEDTLS_CONFIG_FILE)
30 #include MBEDTLS_CONFIG_FILE
36 * \name SECTION: Module settings
38 * The configuration options you can set for this module are in this section.
39 * Either change them in config.h or define them on the compiler command line.
43 #if !defined(MBEDTLS_MEMORY_ALIGN_MULTIPLE)
44 #define MBEDTLS_MEMORY_ALIGN_MULTIPLE 4 /**< Align on multiples of this value */
47 /* \} name SECTION: Module settings */
49 #define MBEDTLS_MEMORY_VERIFY_NONE 0
50 #define MBEDTLS_MEMORY_VERIFY_ALLOC (1 << 0)
51 #define MBEDTLS_MEMORY_VERIFY_FREE (1 << 1)
52 #define MBEDTLS_MEMORY_VERIFY_ALWAYS (MBEDTLS_MEMORY_VERIFY_ALLOC | MBEDTLS_MEMORY_VERIFY_FREE)
59 * \brief Initialize use of stack-based memory allocator.
60 * The stack-based allocator does memory management inside the
61 * presented buffer and does not call calloc() and free().
62 * It sets the global mbedtls_calloc() and mbedtls_free() pointers
63 * to its own functions.
64 * (Provided mbedtls_calloc() and mbedtls_free() are thread-safe if
65 * MBEDTLS_THREADING_C is defined)
67 * \note This code is not optimized and provides a straight-forward
68 * implementation of a stack-based memory allocator.
70 * \param buf buffer to use as heap
71 * \param len size of the buffer
73 void mbedtls_memory_buffer_alloc_init( unsigned char *buf, size_t len );
76 * \brief Free the mutex for thread-safety and clear remaining memory
78 void mbedtls_memory_buffer_alloc_free( void );
81 * \brief Determine when the allocator should automatically verify the state
82 * of the entire chain of headers / meta-data.
83 * (Default: MBEDTLS_MEMORY_VERIFY_NONE)
85 * \param verify One of MBEDTLS_MEMORY_VERIFY_NONE, MBEDTLS_MEMORY_VERIFY_ALLOC,
86 * MBEDTLS_MEMORY_VERIFY_FREE or MBEDTLS_MEMORY_VERIFY_ALWAYS
88 void mbedtls_memory_buffer_set_verify( int verify );
90 #if defined(MBEDTLS_MEMORY_DEBUG)
92 * \brief Print out the status of the allocated memory (primarily for use
93 * after a program should have de-allocated all memory)
94 * Prints out a list of 'still allocated' blocks and their stack
95 * trace if MBEDTLS_MEMORY_BACKTRACE is defined.
97 void mbedtls_memory_buffer_alloc_status( void );
100 * \brief Get the peak heap usage so far
102 * \param max_used Peak number of bytes in use or committed. This
103 * includes bytes in allocated blocks too small to split
104 * into smaller blocks but larger than the requested size.
105 * \param max_blocks Peak number of blocks in use, including free and used
107 void mbedtls_memory_buffer_alloc_max_get( size_t *max_used, size_t *max_blocks );
110 * \brief Reset peak statistics
112 void mbedtls_memory_buffer_alloc_max_reset( void );
115 * \brief Get the current heap usage
117 * \param cur_used Current number of bytes in use or committed. This
118 * includes bytes in allocated blocks too small to split
119 * into smaller blocks but larger than the requested size.
120 * \param cur_blocks Current number of blocks in use, including free and used
122 void mbedtls_memory_buffer_alloc_cur_get( size_t *cur_used, size_t *cur_blocks );
123 #endif /* MBEDTLS_MEMORY_DEBUG */
126 * \brief Verifies that all headers in the memory buffer are correct
127 * and contain sane values. Helps debug buffer-overflow errors.
129 * Prints out first failure if MBEDTLS_MEMORY_DEBUG is defined.
130 * Prints out full header information if MBEDTLS_MEMORY_DEBUG
131 * is defined. (Includes stack trace information for each block if
132 * MBEDTLS_MEMORY_BACKTRACE is defined as well).
134 * \return 0 if verified, 1 otherwise
136 int mbedtls_memory_buffer_alloc_verify( void );
138 #if defined(MBEDTLS_SELF_TEST)
140 * \brief Checkup routine
142 * \return 0 if successful, or 1 if a test failed
144 int mbedtls_memory_buffer_alloc_self_test( int verbose );
151 #endif /* memory_buffer_alloc.h */