////////////////////////////////////////////////////////////////////////////////
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// This source file is part of the ZipArchive library source distribution and
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// is Copyrighted 2000 - 2011 by Artpol Software - Tadeusz Dracz
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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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// For the licensing details refer to the License.txt file.
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//
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// Web Site: http://www.artpol-software.com
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////////////////////////////////////////////////////////////////////////////////
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#include "stdafx.h"
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#include "ZipArchive.h"
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#include "ZipExtraData.h"
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#include "BytesWriter.h"
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using namespace ZipArchiveLib;
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bool CZipExtraData::Read(char* buffer, WORD uSize)
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{
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if (uSize < 4)
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return false;
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CBytesWriter::ReadBytes(m_uHeaderID, buffer);
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m_bHasSize = CZipExtraField::HasSize(m_uHeaderID);
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WORD size;
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if (m_bHasSize)
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{
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CBytesWriter::ReadBytes(size, buffer + 2);
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if (size > (WORD)(uSize - 4))
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return false;
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m_data.Allocate(size);
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memcpy(m_data, buffer + 4, size);
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}
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else
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{
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// The size is not always relevant (in extra headers not conforming to the standard)
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size = (WORD)(uSize - 2);
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m_data.Allocate(size);
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memcpy(m_data, buffer + 2, size);
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}
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return true;
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}
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WORD CZipExtraData::Write(char* buffer)const
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{
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CBytesWriter::WriteBytes(buffer, m_uHeaderID);
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WORD size = (WORD)m_data.GetSize();
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buffer += 2;
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if (m_bHasSize)
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{
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CBytesWriter::WriteBytes(buffer, size);
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buffer += 2;
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}
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memcpy(buffer, m_data, size);
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return (WORD)(size + 4);
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}
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