lwip-1.4.1 (partial)
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mem.h
00001 /* 00002 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without modification, 00006 * are permitted provided that the following conditions are met: 00007 * 00008 * 1. Redistributions of source code must retain the above copyright notice, 00009 * this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright notice, 00011 * this list of conditions and the following disclaimer in the documentation 00012 * and/or other materials provided with the distribution. 00013 * 3. The name of the author may not be used to endorse or promote products 00014 * derived from this software without specific prior written permission. 00015 * 00016 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00017 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00018 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00019 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00020 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00021 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00022 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00023 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00024 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00025 * OF SUCH DAMAGE. 00026 * 00027 * This file is part of the lwIP TCP/IP stack. 00028 * 00029 * Author: Adam Dunkels <adam@sics.se> 00030 * 00031 */ 00032 #ifndef __LWIP_MEM_H__ 00033 #define __LWIP_MEM_H__ 00034 00035 #include "lwip/opt.h" 00036 00037 #ifdef __cplusplus 00038 extern "C" { 00039 #endif 00040 00041 #if MEM_LIBC_MALLOC 00042 00043 #include <stddef.h> /* for size_t */ 00044 00045 typedef size_t mem_size_t; 00046 #define MEM_SIZE_F SZT_F 00047 00048 /* aliases for C library malloc() */ 00049 #define mem_init() 00050 /* in case C library malloc() needs extra protection, 00051 * allow these defines to be overridden. 00052 */ 00053 #ifndef mem_free 00054 #define mem_free free 00055 #endif 00056 #ifndef mem_malloc 00057 #define mem_malloc malloc 00058 #endif 00059 #ifndef mem_calloc 00060 #define mem_calloc calloc 00061 #endif 00062 /* Since there is no C library allocation function to shrink memory without 00063 moving it, define this to nothing. */ 00064 #ifndef mem_trim 00065 #define mem_trim(mem, size) (mem) 00066 #endif 00067 #else /* MEM_LIBC_MALLOC */ 00068 00069 /* MEM_SIZE would have to be aligned, but using 64000 here instead of 00070 * 65535 leaves some room for alignment... 00071 */ 00072 #if MEM_SIZE > 64000L 00073 typedef u32_t mem_size_t; 00074 #define MEM_SIZE_F U32_F 00075 #else 00076 typedef u16_t mem_size_t; 00077 #define MEM_SIZE_F U16_F 00078 #endif /* MEM_SIZE > 64000 */ 00079 00080 #if MEM_USE_POOLS 00081 /** mem_init is not used when using pools instead of a heap */ 00082 #define mem_init() 00083 /** mem_trim is not used when using pools instead of a heap: 00084 we can't free part of a pool element and don't want to copy the rest */ 00085 #define mem_trim(mem, size) (mem) 00086 #else /* MEM_USE_POOLS */ 00087 /* lwIP alternative malloc */ 00088 void mem_init(void); 00089 void *mem_trim(void *mem, mem_size_t size); 00090 #endif /* MEM_USE_POOLS */ 00091 void *mem_malloc(mem_size_t size); 00092 void *mem_calloc(mem_size_t count, mem_size_t size); 00093 void mem_free(void *mem); 00094 #endif /* MEM_LIBC_MALLOC */ 00095 00096 /** Calculate memory size for an aligned buffer - returns the next highest 00097 * multiple of MEM_ALIGNMENT (e.g. LWIP_MEM_ALIGN_SIZE(3) and 00098 * LWIP_MEM_ALIGN_SIZE(4) will both yield 4 for MEM_ALIGNMENT == 4). 00099 */ 00100 #ifndef LWIP_MEM_ALIGN_SIZE 00101 #define LWIP_MEM_ALIGN_SIZE(size) (((size) + MEM_ALIGNMENT - 1) & ~(MEM_ALIGNMENT-1)) 00102 #endif 00103 00104 /** Calculate safe memory size for an aligned buffer when using an unaligned 00105 * type as storage. This includes a safety-margin on (MEM_ALIGNMENT - 1) at the 00106 * start (e.g. if buffer is u8_t[] and actual data will be u32_t*) 00107 */ 00108 #ifndef LWIP_MEM_ALIGN_BUFFER 00109 #define LWIP_MEM_ALIGN_BUFFER(size) (((size) + MEM_ALIGNMENT - 1)) 00110 #endif 00111 00112 /** Align a memory pointer to the alignment defined by MEM_ALIGNMENT 00113 * so that ADDR % MEM_ALIGNMENT == 0 00114 */ 00115 #ifndef LWIP_MEM_ALIGN 00116 #define LWIP_MEM_ALIGN(addr) ((void *)(((mem_ptr_t)(addr) + MEM_ALIGNMENT - 1) & ~(mem_ptr_t)(MEM_ALIGNMENT-1))) 00117 #endif 00118 00119 #ifdef __cplusplus 00120 } 00121 #endif 00122 00123 #endif /* __LWIP_MEM_H__ */
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