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ZoneMinder/src/zm_buffer.cpp at master · bountysource-support/ZoneMinder · GitHub
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zm_buffer.cpp
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/*
* ZoneMinder flexible memory class implementation, $Date$, $Revision$
* Copyright (C) 2001-2008 Philip Coombes
*
* 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; either version 2
* of the License, or (at your option) any later version.
*
* 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
<
string.h
>
#
include
"
zm.h
"
#
include
"
zm_buffer.h
"
unsigned
int
Buffer::assign
(
const
unsigned
char
*pStorage,
unsigned
int
pSize )
{
if
(
mAllocation
< pSize )
{
delete[]
mStorage
;
mAllocation
= pSize;
mHead
=
mStorage
=
new
unsigned
char
[pSize];
}
mSize
= pSize;
memcpy
(
mStorage
, pStorage,
mSize
);
mHead
=
mStorage
;
mTail
=
mHead
+
mSize
;
return
(
mSize
);
}
unsigned
int
Buffer::expand
(
unsigned
int
count )
{
int
spare =
mAllocation
-
mSize
;
int
headSpace =
mHead
-
mStorage
;
int
tailSpace = spare - headSpace;
int
width =
mTail
-
mHead
;
if
( spare > (
int
)count )
{
if
( tailSpace < (
int
)count )
{
memmove
(
mStorage
,
mHead
,
mSize
);
mHead
=
mStorage
;
mTail
=
mHead
+ width;
}
}
else
{
mAllocation
+= count;
unsigned
char
*newStorage =
new
unsigned
char
[
mAllocation
];
if
(
mStorage
)
{
memcpy
( newStorage,
mHead
,
mSize
);
delete[]
mStorage
;
}
mStorage
= newStorage;
mHead
=
mStorage
;
mTail
=
mHead
+ width;
}
return
(
mSize
);
}
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