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67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
#ifndef INCLUDES_MYSQL_INSTANCE_MANAGER_BUFFER_H
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#define INCLUDES_MYSQL_INSTANCE_MANAGER_BUFFER_H
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/* Copyright (C) 2004 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include <my_global.h>
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#include <my_sys.h>
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#ifdef __GNUC__
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#pragma interface
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#endif
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/*
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This class is a simple implementation of the buffer of varying size.
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It is used to store MySQL client-server protocol packets. This is why
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the maximum buffer size if 16Mb. (See internals manual section
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7. MySQL Client/Server Protocol)
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*/
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class Buffer
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{
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private:
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enum { BUFFER_INITIAL_SIZE= 4096 };
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/* maximum buffer size is 16Mb */
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enum { MAX_BUFFER_SIZE= 16777216 };
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size_t buffer_size;
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/* Error flag. Triggered if we get an error of some kind */
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int error;
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public:
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Buffer(size_t buffer_size_arg= BUFFER_INITIAL_SIZE)
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:buffer_size(buffer_size_arg), error(0)
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{
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/*
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As append() will invokes realloc() anyway, it's ok if malloc returns 0
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*/
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if (!(buffer= (char*) my_malloc(buffer_size, MYF(0))))
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buffer_size= 0;
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}
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~Buffer()
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{
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free(buffer);
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}
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public:
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char *buffer;
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int get_size();
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int is_error();
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int append(uint position, const char *string, uint len_arg);
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int reserve(uint position, uint len_arg);
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};
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#endif /* INCLUDES_MYSQL_INSTANCE_MANAGER_BUFFER_H */
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