Added ability to parse directly from an input stream (eg. file). This allows very big messages to be parsed without loading the whole message data into memory.

1 files changed, 95 insertions, 0 deletions

diff --git a/src/utility/seekableInputStreamRegionAdapter.cpp b/src/utility/seekableInputStreamRegionAdapter.cpp
new file mode 100644
index 00000000..348618c0
--- /dev/null
+++ b/src/utility/seekableInputStreamRegionAdapter.cpp
@@ -0,0 +1,95 @@
+//
+// VMime library (http://www.vmime.org)
+// Copyright (C) 2002-2012 Vincent Richard <[email protected]>
+//
+// 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 3 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.,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//
+// Linking this library statically or dynamically with other modules is making
+// a combined work based on this library.  Thus, the terms and conditions of
+// the GNU General Public License cover the whole combination.
+//
+
+#include "vmime/utility/seekableInputStreamRegionAdapter.hpp"
+
+
+namespace vmime {
+namespace utility {
+
+
+seekableInputStreamRegionAdapter::seekableInputStreamRegionAdapter
+	(ref <seekableInputStream> stream, const size_type begin, const size_type length)
+	: m_stream(stream), m_begin(begin), m_length(length)
+{
+}
+
+
+bool seekableInputStreamRegionAdapter::eof() const
+{
+	return getPosition() >= m_length;
+}
+
+
+void seekableInputStreamRegionAdapter::reset()
+{
+	m_stream->seek(m_begin);
+}
+
+
+stream::size_type seekableInputStreamRegionAdapter::read
+	(value_type* const data, const size_type count)
+{
+	if (getPosition() + count >= m_length)
+	{
+		const size_type remaining = m_length - getPosition();
+		return m_stream->read(data, remaining);
+	}
+	else
+	{
+		return m_stream->read(data, count);
+	}
+}
+
+
+stream::size_type seekableInputStreamRegionAdapter::skip(const size_type count)
+{
+	if (getPosition() + count >= m_length)
+	{
+		const size_type remaining = m_length - getPosition();
+		m_stream->skip(remaining);
+		return remaining;
+	}
+	else
+	{
+		m_stream->skip(count);
+		return count;
+	}
+}
+
+
+stream::size_type seekableInputStreamRegionAdapter::getPosition() const
+{
+	return m_stream->getPosition() - m_begin;
+}
+
+
+void seekableInputStreamRegionAdapter::seek(const size_type pos)
+{
+	m_stream->seek(m_begin + pos);
+}
+
+
+} // utility
+} // vmime
+