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/*
* libopenraw - streamclone.cpp
*
* Copyright (C) 2006 Hubert Figuière
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include "streamclone.h"
namespace OpenRaw {
namespace IO {
StreamClone::StreamClone(Stream *clone, off_t offset)
: Stream(clone->get_path().c_str()),
m_cloned(clone), m_offset(offset)
{
}
StreamClone::~StreamClone()
{
}
Stream::Error StreamClone::open()
{
if (m_cloned == NULL) {
set_error(OR_ERROR_CLOSED_STREAM);
return OR_ERROR_CLOSED_STREAM;
}
m_cloned->seek(m_offset, SEEK_SET);
//no-op
//FIXME determine what is the policy for opening clone
//streams
return OR_ERROR_NONE;
}
int StreamClone::close()
{
m_cloned = NULL;
return 0;
}
int StreamClone::seek(off_t offset, int whence)
{
if (m_cloned == NULL) {
set_error(OR_ERROR_CLOSED_STREAM);
return -1;
}
if (whence == SEEK_SET) {
offset += m_offset;
}
return m_cloned->seek(offset, whence);
}
int StreamClone::read(void *buf, size_t count)
{
if (m_cloned == NULL) {
set_error(OR_ERROR_CLOSED_STREAM);
return -1;
}
return m_cloned->read(buf, count);
}
off_t StreamClone::filesize()
{
if (m_cloned == NULL) {
set_error(OR_ERROR_CLOSED_STREAM);
return -1;
}
return m_cloned->filesize();
}
}
}
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