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//
// tardy - a tar post-processor
// Copyright (C) 2003 Peter Miller;
// All rights reserved.
//
// 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, USA.
//
// MANIFEST: functions to manipulate buffers
//
#pragma implementation "file_output_buffer"
#include <ac/string.h>
#include <file/output/buffer.h>
file_output_buffer::~file_output_buffer()
{
if (pos > 0)
{
deeper->write(buffer, pos);
pos = 0;
}
delete buffer;
buffer = 0;
delete deeper;
deeper = 0;
}
file_output_buffer::file_output_buffer(file_output *arg1, int arg2) :
deeper(arg1),
blocksize(arg2 > 0 ? arg2 : 512),
buffer(0),
pos(0)
{
}
const char *
file_output_buffer::filename()
const
{
return deeper->filename();
}
void
file_output_buffer::write(const void *data, int nbytes)
{
while (nbytes > 0)
{
//
// Don't double handle the data if we can avoid it.
// (But only write `blocksize' bytes at a time.)
//
if (pos == 0 && nbytes >= blocksize)
{
deeper->write(data, blocksize);
data = (char *)data + blocksize;
nbytes -= blocksize;
continue;
}
//
// Add the data to the end of the buffer.
//
int len = blocksize - pos;
if (len > nbytes)
len = nbytes;
if (!buffer)
buffer = new char[blocksize];
memcpy(buffer + pos, data, len);
pos += len;
if (pos >= blocksize)
{
//
// If the buffer is full,
// write it out and start again.
//
deeper->write(buffer, pos);
pos = 0;
}
data = (char *)data + len;
nbytes -= len;
}
}
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