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////////////////////////////////////////////////////////////////////////////////
// This source file is part of the ZipArchive library source distribution and
// is Copyrighted 2000 - 2007 by Artpol Software - Tadeusz Dracz
//
// 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.
//
// For the licensing details refer to the License.txt file.
//
// Web Site: http://www.artpol-software.com
////////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "ZipExtraField.h"
bool CZipExtraField::Read(CZipStorage *pStorage, WORD uSize)
{
if (uSize == 0)
return true;
Clear();
CZipAutoBuffer buffer;
buffer.Allocate(uSize);
pStorage->Read(buffer, uSize, true);
char* position = (char*) buffer;
do
{
CZipExtraData* pExtra = new CZipExtraData();
if (!pExtra->Read(position, uSize))
{
delete pExtra;
return false;
}
int totalSize = pExtra->GetTotalSize();
if (totalSize > uSize || totalSize < 0)
return false;
position += totalSize;
uSize = (WORD)(uSize - totalSize);
Add(pExtra);
}
while (uSize > 0);
return true;
}
void CZipExtraField::Write(char* buffer)const
{
int offset = 0;
for (int i = 0; i < GetCount(); i++)
offset += GetAt(i)->Write(buffer + offset);
}
int CZipExtraField::GetTotalSize()const
{
int total = 0;
for (int i = 0; i < GetCount(); i++)
total += GetAt(i)->GetTotalSize();
return total;
}
void CZipExtraField::RemoveInternalHeaders()
{
for (int i = GetCount() - 1; i >= 0; i--)
{
WORD headerID = GetAt(i)->GetHeaderID();
if (
headerID == ZIP_EXTRA_ZARCH_NAME)
RemoveAt(i);
}
}
CZipExtraData* CZipExtraField::Lookup(WORD headerID, int& index) const
{
// we can do a non-efficient search here
// usually the number of extra fields is low, if any
for (int i = 0; i < GetCount(); i++)
{
CZipExtraData* pExtra = GetAt(i);
if (pExtra->m_uHeaderID == headerID)
{
index = i;
return pExtra;
}
}
return NULL;
}
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