text: /*
   * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
   * All rights reserved. 
   * 
   * 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 above 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. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission. 
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
   *
   * This file is part of the lwIP TCP/IP stack.
   * 
   * Author: Adam Dunkels <adam@sics.se>
   *
   */
  #ifndef __LWIP_MEM_H__
  #define __LWIP_MEM_H__
  
  #include "lwip/opt.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #if MEM_LIBC_MALLOC
  
  #include <stddef.h> /* for size_t */
  
  typedef size_t mem_size_t;
  #define MEM_SIZE_F SZT_F
  
  /* aliases for C library malloc() */
  #define mem_init()
  /* in case C library malloc() needs extra protection,
   * allow these defines to be overridden.
   */
  #ifndef mem_free
  //#define mem_free free
  #define mem_free vPortFree
  #endif
  #ifndef mem_malloc
  //#define mem_malloc malloc
  #define mem_malloc pvPortMalloc
  #endif
  #ifndef mem_calloc
  #define mem_calloc calloc
  #endif
  /* Since there is no C library allocation function to shrink memory without
     moving it, define this to nothing. */
  #ifndef mem_trim
  #define mem_trim(mem, size) (mem)
  #endif
  #else /* MEM_LIBC_MALLOC */
  
  /* MEM_SIZE would have to be aligned, but using 64000 here instead of
   * 65535 leaves some room for alignment...
   */
  #if MEM_SIZE > 64000L
  typedef u32_t mem_size_t;
  #define MEM_SIZE_F U32_F
  #else
  typedef u16_t mem_size_t;
  #define MEM_SIZE_F U16_F
  #endif /* MEM_SIZE > 64000 */
  
  #if MEM_USE_POOLS
  /** mem_init is not used when using pools instead of a heap */
  #define mem_init()
  /** mem_trim is not used when using pools instead of a heap:
      we can't free part of a pool element and don't want to copy the rest */
  #define mem_trim(mem, size) (mem)
  #else /* MEM_USE_POOLS */
  /* lwIP alternative malloc */
  void  mem_init(void);
  void *mem_trim(void *mem, mem_size_t size);
  #endif /* MEM_USE_POOLS */
  void *mem_malloc(mem_size_t size);
  void *mem_calloc(mem_size_t count, mem_size_t size);
  void  mem_free(void *mem);
  #endif /* MEM_LIBC_MALLOC */
  
  /** Calculate memory size for an aligned buffer - returns the next highest
   * multiple of MEM_ALIGNMENT (e.g. LWIP_MEM_ALIGN_SIZE(3) and
   * LWIP_MEM_ALIGN_SIZE(4) will both yield 4 for MEM_ALIGNMENT == 4).
   */
  #ifndef LWIP_MEM_ALIGN_SIZE
  #define LWIP_MEM_ALIGN_SIZE(size) (((size) + MEM_ALIGNMENT - 1) & ~(MEM_ALIGNMENT-1))
  #endif
  
  /** Calculate safe memory size for an aligned buffer when using an unaligned
   * type as storage. This includes a safety-margin on (MEM_ALIGNMENT - 1) at the
   * start (e.g. if buffer is u8_t[] and actual data will be u32_t*)
   */
  #ifndef LWIP_MEM_ALIGN_BUFFER
  #define LWIP_MEM_ALIGN_BUFFER(size) (((size) + MEM_ALIGNMENT - 1))
  #endif
  
  /** Align a memory pointer to the alignment defined by MEM_ALIGNMENT
   * so that ADDR % MEM_ALIGNMENT == 0
   */
  #ifndef LWIP_MEM_ALIGN
  #define LWIP_MEM_ALIGN(addr) ((void *)(((mem_ptr_t)(addr) + MEM_ALIGNMENT - 1) & ~(mem_ptr_t)(MEM_ALIGNMENT-1)))
  #endif
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* __LWIP_MEM_H__ */
  