96 lines
2.3 KiB
C++
96 lines
2.3 KiB
C++
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//
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// VMime library (http://www.vmime.org)
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// Copyright (C) 2002-2012 Vincent Richard <vincent@vincent-richard.net>
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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 as
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// published by the Free Software Foundation; either version 3 of
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// 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 GNU
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// 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 along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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//
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// Linking this library statically or dynamically with other modules is making
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// a combined work based on this library. Thus, the terms and conditions of
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// the GNU General Public License cover the whole combination.
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//
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#include "vmime/utility/seekableInputStreamRegionAdapter.hpp"
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namespace vmime {
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namespace utility {
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seekableInputStreamRegionAdapter::seekableInputStreamRegionAdapter
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(ref <seekableInputStream> stream, const size_type begin, const size_type length)
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: m_stream(stream), m_begin(begin), m_length(length)
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{
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}
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bool seekableInputStreamRegionAdapter::eof() const
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{
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return getPosition() >= m_length;
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}
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void seekableInputStreamRegionAdapter::reset()
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{
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m_stream->seek(m_begin);
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}
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stream::size_type seekableInputStreamRegionAdapter::read
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(value_type* const data, const size_type count)
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{
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if (getPosition() + count >= m_length)
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{
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const size_type remaining = m_length - getPosition();
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return m_stream->read(data, remaining);
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}
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else
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{
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return m_stream->read(data, count);
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}
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}
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stream::size_type seekableInputStreamRegionAdapter::skip(const size_type count)
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{
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if (getPosition() + count >= m_length)
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{
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const size_type remaining = m_length - getPosition();
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m_stream->skip(remaining);
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return remaining;
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}
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else
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{
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m_stream->skip(count);
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return count;
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}
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}
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stream::size_type seekableInputStreamRegionAdapter::getPosition() const
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{
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return m_stream->getPosition() - m_begin;
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}
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void seekableInputStreamRegionAdapter::seek(const size_type pos)
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{
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m_stream->seek(m_begin + pos);
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}
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} // utility
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} // vmime
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