mirror of
https://github.com/MariaDB/server.git
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111 lines
2.9 KiB
C++
111 lines
2.9 KiB
C++
/* 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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#if defined(__GNUC__) && defined(USE_PRAGMA_IMPLEMENTATION)
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#pragma implementation
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#endif
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#include "buffer.h"
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#include <m_string.h>
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const uint Buffer::BUFFER_INITIAL_SIZE= 4096;
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const uint Buffer::MAX_BUFFER_SIZE= 16777216;
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/*
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Puts the given string to the buffer.
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SYNOPSYS
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append()
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position start position in the buffer
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string string to be put in the buffer
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len_arg the length of the string. This way we can avoid some
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strlens.
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DESCRIPTION
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The method puts a string into the buffer, starting from position .
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In the case when the buffer is too small it reallocs the buffer. The
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total size of the buffer is restricted with 16.
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RETURN
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0 - ok
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1 - got an error in reserve()
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*/
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int Buffer::append(uint position, const char *string, uint len_arg)
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{
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if (reserve(position, len_arg))
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return 1;
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strnmov(buffer + position, string, len_arg);
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return 0;
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}
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/*
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Checks whether the current buffer size is ok to put a string of the length
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"len_arg" starting from "position" and reallocs it if no.
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SYNOPSYS
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reserve()
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position the number starting byte on the buffer to store a buffer
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len_arg the length of the string.
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DESCRIPTION
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The method checks whether it is possible to put a string of the "len_arg"
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length into the buffer, starting from "position" byte. In the case when the
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buffer is too small it reallocs the buffer. The total size of the buffer is
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restricted with 16 Mb.
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RETURN
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0 - ok
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1 - realloc error or we have come to the 16Mb barrier
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*/
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int Buffer::reserve(uint position, uint len_arg)
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{
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if (position + len_arg >= MAX_BUFFER_SIZE)
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goto err;
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if (position + len_arg >= buffer_size)
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{
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buffer= (char*) my_realloc(buffer,
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min(MAX_BUFFER_SIZE,
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max((uint) (buffer_size*1.5),
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position + len_arg)), MYF(0));
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if (!(buffer))
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goto err;
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buffer_size= (uint) (buffer_size*1.5);
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}
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return 0;
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err:
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error= 1;
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return 1;
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}
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int Buffer::get_size()
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{
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return buffer_size;
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}
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int Buffer::is_error()
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{
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return error;
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}
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