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#ifndef INCLUDES_MYSQL_INSTANCE_MANAGER_BUFFER_H
#define INCLUDES_MYSQL_INSTANCE_MANAGER_BUFFER_H
/* Copyright (C) 2004 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <my_global.h>
#include <my_sys.h>
#if defined(__GNUC__) && defined(USE_PRAGMA_INTERFACE)
#pragma interface
#endif
/*
This class is a simple implementation of the buffer of varying size.
It is used to store MySQL client-server protocol packets. This is why
the maximum buffer size if 16Mb. (See internals manual section
7. MySQL Client/Server Protocol)
*/
class Buffer
{
private:
static const uint BUFFER_INITIAL_SIZE;
/* maximum buffer size is 16Mb */
static const uint MAX_BUFFER_SIZE;
size_t buffer_size;
/* Error flag. Triggered if we get an error of some kind */
int error;
public:
Buffer(size_t buffer_size_arg= BUFFER_INITIAL_SIZE)
:buffer_size(buffer_size_arg), error(0)
{
/*
As append() will invokes realloc() anyway, it's ok if malloc returns 0
*/
if (!(buffer= (uchar*) my_malloc(buffer_size, MYF(0))))
buffer_size= 0;
}
~Buffer()
{
my_free(buffer, MYF(0));
}
public:
uchar *buffer;
int get_size();
int is_error();
int append(size_t position, const char *string, size_t len_arg);
int reserve(size_t position, size_t len_arg);
};
#endif /* INCLUDES_MYSQL_INSTANCE_MANAGER_BUFFER_H */
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