C++ FT_Memory类代码示例

    FT_Done_FreeType_2(FT_Library  library)
    {
        if(library)
        {
            FT_Memory  memory = library->memory;
            FT_Done_Library(library);
            memory->free(memory, memory);
        }

        return FT_Err_Ok;
    }

  ft_mem_qrealloc( FT_Memory  memory,
                   FT_Long    item_size,
                   FT_Long    cur_count,
                   FT_Long    new_count,
                   void*      block,
                   FT_Error  *p_error )
  {
    FT_Error  error = FT_Err_Ok;


    /* Note that we now accept `item_size == 0' as a valid parameter, in
     * order to cover very weird cases where an ALLOC_MULT macro would be
     * called.
     */
    if ( cur_count < 0 || new_count < 0 || item_size < 0 )
    {
      /* may help catch/prevent nasty security issues */
      error = FT_THROW( Invalid_Argument );
    }
    else if ( new_count == 0 || item_size == 0 )
    {
      ft_mem_free( memory, block );
      block = NULL;
    }
    else if ( new_count > FT_INT_MAX / item_size )
    {
      error = FT_THROW( Array_Too_Large );
    }
    else if ( cur_count == 0 )
    {
      FT_ASSERT( !block );

      block = memory->alloc( memory, new_count * item_size );
      if ( block == NULL )
        error = FT_THROW( Out_Of_Memory );
    }
    else
    {
      FT_Pointer  block2;
      FT_Long     cur_size = cur_count * item_size;
      FT_Long     new_size = new_count * item_size;


      block2 = memory->realloc( memory, cur_size, new_size, block );
      if ( !block2 )
        error = FT_THROW( Out_Of_Memory );
      else
        block = block2;
    }

    *p_error = error;
    return block;
  }

  FT_Done_Memory( FT_Memory  memory )
  {
#ifdef FT_DEBUG_MEMORY
    ft_mem_debug_done( memory );
#endif
    memory->free( memory, memory );
  }

  FT_Alloc( FT_Memory  memory,
            FT_Long    size,
            void*     *P )
  {
    FT_ASSERT( P != 0 );

    if ( size > 0 )
    {
      *P = memory->alloc( memory, size );
      if ( !*P )
      {
        FT_ERROR(( "FT_Alloc:" ));
        FT_ERROR(( " Out of memory? (%ld requested)\n",
                   size ));

        return FT_Err_Out_Of_Memory;
      }
      FT_MEM_ZERO( *P, size );
    }
    else
      *P = NULL;

    FT_TRACE7(( "FT_Alloc:" ));
    FT_TRACE7(( " size = %ld, block = 0x%08p, ref = 0x%08p\n",
                size, *P, P ));

    return FT_Err_Ok;
  }

  FT_QRealloc( FT_Memory  memory,
               FT_Long    current,
               FT_Long    size,
               void**     P )
  {
    void*  Q;


    FT_ASSERT( P != 0 );

    /* if the original pointer is NULL, call FT_QAlloc() */
    if ( !*P )
      return FT_QAlloc( memory, size, P );

    /* if the new block if zero-sized, clear the current one */
    if ( size <= 0 )
    {
      FT_Free( memory, P );
      return FT_Err_Ok;
    }

    Q = memory->realloc( memory, current, size, *P );
    if ( !Q )
      goto Fail;

    *P = Q;
    return FT_Err_Ok;

  Fail:
    FT_ERROR(( "FT_QRealloc:" ));
    FT_ERROR(( " Failed (current %ld, requested %ld)\n",
               current, size ));
    return FT_Err_Out_Of_Memory;
  }

  FT_Free( FT_Memory  memory,
           void**     P )
  {
    FT_TRACE7(( "FT_Free:" ));
    FT_TRACE7(( " Freeing block 0x%08p, ref 0x%08p\n",
                P, P ? *P : (void*)0 ));

    if ( P && *P )
    {
      memory->free( memory, *P );
      *P = 0;
    }
  }

  static FT_MemTable
  ft_mem_table_new( FT_Memory  memory )
  {
    FT_MemTable  table;


    table = (FT_MemTable)memory->alloc( memory, sizeof ( *table ) );
    if ( !table )
      goto Exit;

    FT_ZERO( table );

    table->size  = FT_MEM_SIZE_MIN;
    table->nodes = 0;

    table->memory = memory;

    table->memory_user = memory->user;

    table->alloc   = memory->alloc;
    table->realloc = memory->realloc;
    table->free    = memory->free;

    table->buckets = (FT_MemNode *)
                       memory->alloc(
                         memory,
                         table->size * (FT_Long)sizeof ( FT_MemNode ) );
    if ( table->buckets )
      FT_ARRAY_ZERO( table->buckets, table->size );
    else
    {
      memory->free( memory, table );
      table = NULL;
    }

  Exit:
    return table;
  }

  ft_mem_qrealloc( FT_Memory  memory,
                   FT_Long    item_size,
                   FT_Long    cur_count,
                   FT_Long    new_count,
                   void*      block,
                   FT_Error  *p_error )
  {
    FT_Error  error = FT_Err_Ok;


    if ( cur_count < 0 || new_count < 0 || item_size <= 0 )
    {
      /* may help catch/prevent nasty security issues */
      error = FT_Err_Invalid_Argument;
    }
    else if ( new_count == 0 )
    {
      ft_mem_free( memory, block );
      block = NULL;
    }
    else if ( new_count > FT_INT_MAX/item_size )
    {
      error = FT_Err_Array_Too_Large;
    }
    else if ( cur_count == 0 )
    {
      FT_ASSERT( block == NULL );

      block = ft_mem_alloc( memory, new_count*item_size, &error );
    }
    else
    {
      FT_Pointer  block2;
      FT_Long     cur_size = cur_count*item_size;
      FT_Long     new_size = new_count*item_size;


      block2 = memory->realloc( memory, cur_size, new_size, block );
      if ( block2 == NULL )
        error = FT_Err_Out_Of_Memory;
      else
        block = block2;
    }

    *p_error = error;
    return block;
  }

  ft_mem_qalloc( FT_Memory  memory,
                 FT_Long    size,
                 FT_Error  *p_error )
  {
    FT_Error    error = FT_Err_Ok;
    FT_Pointer  block = NULL;


    if ( size > 0 )
    {
      block = memory->alloc( memory, size );
      if ( block == NULL )
        error = FT_Err_Out_Of_Memory;
    }
    else if ( size < 0 )
    {
      /* may help catch/prevent security issues */
      error = FT_Err_Invalid_Argument;
    }

    *p_error = error;
    return block;
  }

 ft_mem_free( FT_Memory   memory,
              const void *P )
 {
   if ( P )
     memory->free( memory, (void*)P );
 }