text: /* [ mmblock.h ] - copy-on-write memory block
   * -----------------------------------------------------------------------------
   * Copyright (c) 2010, Matteo Bertozzi
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *     * Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *     * 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.
   *     * Neither the name of the author nor the
   *       names of its contributors may be used to endorse or promote products
   *       derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 MATTEO BERTOZZI 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.
   * -----------------------------------------------------------------------------
   */
  
  #ifndef _MMBLOCK_H_
  #define _MMBLOCK_H_
  
  #include <stdint.h>
  
  typedef struct _mmallocator {
      void * (*alloc) (void *user_data, uint32_t n);
      void   (*free)  (void *user_data, void *ptr);
      void *user_data;
  } mmallocator_t;
  
  typedef struct _mmblock {
      void *alk;
      void *d;
  } mmblock_t;
  
  mmblock_t * mmblock_alloc    (mmblock_t *block,
                                mmallocator_t *allocator,
                                uint32_t n);
  mmblock_t * mmblock_zalloc   (mmblock_t *block,
                                mmallocator_t *allocator,
                                uint32_t n);
  void        mmblock_free     (mmblock_t *block);
  
  void        mmblock_copy     (mmblock_t *dest,
                                const mmblock_t *src);
  
  int32_t     mmblock_read     (mmblock_t *block,
                                void *buf,
                                uint32_t offset,
                                uint32_t n);
  int32_t     mmblock_write    (mmblock_t *block,
                                const void *buf,
                                uint32_t offset,
                                uint32_t n);
  
  #endif /* !_MMBLOCK_H_ */
  
  