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Decompress.cpp
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//
// Decompress.cpp
//
// $Id: //poco/1.4/Zip/src/Decompress.cpp#1 $
//
// Library: Zip
// Package: Zip
// Module: Decompress
//
// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#include "Poco/Zip/Decompress.h"
#include "Poco/Zip/ZipLocalFileHeader.h"
#include "Poco/Zip/ZipArchive.h"
#include "Poco/Zip/ZipStream.h"
#include "Poco/Zip/ZipException.h"
#include "Poco/File.h"
#include "Poco/Exception.h"
#include "Poco/StreamCopier.h"
#include "Poco/Delegate.h"
#include "Poco/FileStream.h"
namespace Poco {
namespace Zip {
Decompress::Decompress(std::istream& in, const Poco::Path& outputDir, bool flattenDirs, bool keepIncompleteFiles):
_in(in),
_outDir(outputDir),
_flattenDirs(flattenDirs),
_keepIncompleteFiles(keepIncompleteFiles),
_mapping()
{
_outDir.makeAbsolute();
_outDir.makeDirectory();
poco_assert (_in.good());
Poco::File tmp(_outDir);
if (!tmp.exists())
{
tmp.createDirectories();
}
if (!tmp.isDirectory())
throw Poco::IOException("Failed to create/open directory: " + _outDir.toString());
EOk += Poco::Delegate<Decompress, std::pair<const ZipLocalFileHeader, const Poco::Path> >(this, &Decompress::onOk);
}
Decompress::~Decompress()
{
EOk -= Poco::Delegate<Decompress, std::pair<const ZipLocalFileHeader, const Poco::Path> >(this, &Decompress::onOk);
}
ZipArchive Decompress::decompressAllFiles()
{
poco_assert (_mapping.empty());
ZipArchive arch(_in, *this);
return arch;
}
bool Decompress::handleZipEntry(std::istream& zipStream, const ZipLocalFileHeader& hdr)
{
if (hdr.isDirectory())
{
// directory have 0 size, nth to read
if (!_flattenDirs)
{
std::string dirName = hdr.getFileName();
if (dirName.find(ZipCommon::ILLEGAL_PATH) != std::string::npos)
throw ZipException("Illegal entry name " + dirName + " containing " + ZipCommon::ILLEGAL_PATH);
Poco::Path dir(_outDir, dirName);
dir.makeDirectory();
Poco::File aFile(dir);
aFile.createDirectories();
}
return true;
}
try
{
std::string fileName = hdr.getFileName();
if (_flattenDirs)
{
// remove path info
Poco::Path p(fileName);
p.makeFile();
fileName = p.getFileName();
}
if (fileName.find(ZipCommon::ILLEGAL_PATH) != std::string::npos)
throw ZipException("Illegal entry name " + fileName + " containing " + ZipCommon::ILLEGAL_PATH);
Poco::Path file(fileName);
file.makeFile();
Poco::Path dest(_outDir, file);
dest.makeFile();
if (dest.depth() > 0)
{
Poco::File aFile(dest.parent());
aFile.createDirectories();
}
Poco::FileOutputStream out(dest.toString());
ZipInputStream inp(zipStream, hdr, false);
Poco::StreamCopier::copyStream(inp, out);
out.close();
Poco::File aFile(dest.toString());
if (!aFile.exists() || !aFile.isFile())
{
std::pair<const ZipLocalFileHeader, const std::string> tmp = std::make_pair(hdr, "Failed to create output stream " + dest.toString());
EError.notify(this, tmp);
return false;
}
if (!inp.crcValid())
{
if (!_keepIncompleteFiles)
aFile.remove();
std::pair<const ZipLocalFileHeader, const std::string> tmp = std::make_pair(hdr, "CRC mismatch. Corrupt file: " + dest.toString());
EError.notify(this, tmp);
return false;
}
// cannot check against hdr.getUnCompressedSize if CRC and size are not set in hdr but in a ZipDataInfo
// crc is typically enough to detect errors
if (aFile.getSize() != hdr.getUncompressedSize() && !hdr.searchCRCAndSizesAfterData())
{
if (!_keepIncompleteFiles)
aFile.remove();
std::pair<const ZipLocalFileHeader, const std::string> tmp = std::make_pair(hdr, "Filesizes do not match. Corrupt file: " + dest.toString());
EError.notify(this, tmp);
return false;
}
std::pair<const ZipLocalFileHeader, const Poco::Path> tmp = std::make_pair(hdr, file);
EOk.notify(this, tmp);
}
catch (Poco::Exception& e)
{
std::pair<const ZipLocalFileHeader, const std::string> tmp = std::make_pair(hdr, std::string("Exception: " + e.displayText()));
EError.notify(this, tmp);
return false;
}
catch (...)
{
std::pair<const ZipLocalFileHeader, const std::string> tmp = std::make_pair(hdr, std::string("Unknown Exception"));
EError.notify(this, tmp);
return false;
}
return true;
}
void Decompress::onOk(const void*, std::pair<const ZipLocalFileHeader, const Poco::Path>& val)
{
_mapping.insert(std::make_pair(val.first.getFileName(), val.second));
}
} } // namespace Poco::Zip