66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
/*
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* ZoneMinder flexible memory class implementation, $Date$, $Revision$
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* Copyright (C) 2003 Philip Coombes
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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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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*
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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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*/
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#include <string.h>
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#include "zm.h"
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#include "zm_buffer.h"
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unsigned int Buffer::Assign( const unsigned char *p_storage, unsigned int p_size )
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{
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delete[] storage;
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size = allocation = p_size;
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head = storage = new unsigned char[size];
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memcpy( storage, p_storage, size );
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tail = head + size;
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return( size );
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}
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unsigned int Buffer::Expand( unsigned int count )
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{
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int spare = allocation - size;
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int head_space = head - storage;
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int tail_space = spare - head_space;
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int width = tail - head;
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if ( spare > count )
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{
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if ( tail_space < count )
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{
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memmove( storage, head, size );
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head = storage;
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tail = head + width;
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}
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}
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else
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{
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allocation += count;
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unsigned char *new_storage = new unsigned char[allocation];
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if ( storage )
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{
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memcpy( new_storage, storage, size );
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delete[] storage;
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}
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storage = new_storage;
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head = storage;
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tail = head + width;
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}
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size += count;
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return( size );
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}
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