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·218 lines (188 loc) · 5.11 KB
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//
// ZipLocalFileHeader.cpp
//
// $Id: //poco/1.4/Zip/src/ZipLocalFileHeader.cpp#1 $
//
// Library: Zip
// Package: Zip
// Module: ZipLocalFileHeader
//
// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Zip/ZipLocalFileHeader.h"
#include "Poco/Zip/ZipDataInfo.h"
#include "Poco/Zip/ParseCallback.h"
#include "Poco/Buffer.h"
#include "Poco/Exception.h"
#include "Poco/File.h"
#include <cstring>
namespace Poco {
namespace Zip {
const char ZipLocalFileHeader::HEADER[ZipCommon::HEADER_SIZE] = {'\x50', '\x4b', '\x03', '\x04'};
ZipLocalFileHeader::ZipLocalFileHeader(const Poco::Path& fileName,
const Poco::DateTime& lastModifiedAt,
ZipCommon::CompressionMethod cm,
ZipCommon::CompressionLevel cl):
_rawHeader(),
_startPos(-1),
_endPos(-1),
_fileName(),
_lastModifiedAt(),
_extraField(),
_crc32(0),
_compressedSize(0),
_uncompressedSize(0)
{
std::memcpy(_rawHeader, HEADER, ZipCommon::HEADER_SIZE);
std::memset(_rawHeader+ZipCommon::HEADER_SIZE, 0, FULLHEADER_SIZE - ZipCommon::HEADER_SIZE);
ZipCommon::HostSystem hs = ZipCommon::HS_FAT;
#if (POCO_OS == POCO_OS_CYGWIN)
hs = ZipCommon::HS_UNIX;
#endif
#if (POCO_OS == POCO_OS_VMS)
hs = ZipCommon::HS_VMS;
#endif
#if defined(POCO_OS_FAMILY_UNIX)
hs = ZipCommon::HS_UNIX;
#endif
setHostSystem(hs);
setEncryption(false);
setExtraFieldSize(0);
setLastModifiedAt(lastModifiedAt);
init(fileName, cm, cl);
}
ZipLocalFileHeader::ZipLocalFileHeader(std::istream& inp, bool assumeHeaderRead, ParseCallback& callback):
_rawHeader(),
_startPos(inp.tellg()),
_endPos(-1),
_fileName(),
_lastModifiedAt(),
_extraField(),
_crc32(0),
_compressedSize(0),
_uncompressedSize(0)
{
poco_assert_dbg( (EXTRAFIELD_POS+EXTRAFIELD_LENGTH) == FULLHEADER_SIZE);
if (assumeHeaderRead)
_startPos -= ZipCommon::HEADER_SIZE;
parse(inp, assumeHeaderRead);
bool ok = callback.handleZipEntry(inp, *this);
if (ok)
{
if (searchCRCAndSizesAfterData())
{
ZipDataInfo nfo(inp, false);
setCRC(nfo.getCRC32());
setCompressedSize(nfo.getCompressedSize());
setUncompressedSize(nfo.getUncompressedSize());
}
}
else
{
poco_assert_dbg(!searchCRCAndSizesAfterData());
ZipUtil::sync(inp);
}
_endPos = _startPos + getHeaderSize() + _compressedSize; // exclude the data block!
}
ZipLocalFileHeader::~ZipLocalFileHeader()
{
}
void ZipLocalFileHeader::parse(std::istream& inp, bool assumeHeaderRead)
{
if (!assumeHeaderRead)
{
inp.read(_rawHeader, ZipCommon::HEADER_SIZE);
}
else
{
std::memcpy(_rawHeader, HEADER, ZipCommon::HEADER_SIZE);
}
poco_assert (std::memcmp(_rawHeader, HEADER, ZipCommon::HEADER_SIZE) == 0);
// read the rest of the header
inp.read(_rawHeader + ZipCommon::HEADER_SIZE, FULLHEADER_SIZE - ZipCommon::HEADER_SIZE);
poco_assert (_rawHeader[VERSION_POS + 1]>= ZipCommon::HS_FAT && _rawHeader[VERSION_POS + 1] < ZipCommon::HS_UNUSED);
poco_assert (getMajorVersionNumber() <= 2);
poco_assert (ZipUtil::get16BitValue(_rawHeader, COMPR_METHOD_POS) < ZipCommon::CM_UNUSED);
parseDateTime();
Poco::UInt16 len = getFileNameLength();
Poco::Buffer<char> buf(len);
inp.read(buf.begin(), len);
_fileName = std::string(buf.begin(), len);
if (hasExtraField())
{
len = getExtraFieldLength();
Poco::Buffer<char> xtra(len);
inp.read(xtra.begin(), len);
_extraField = std::string(xtra.begin(), len);
}
if (!searchCRCAndSizesAfterData())
{
_crc32 = getCRCFromHeader();
_compressedSize = getCompressedSizeFromHeader();
_uncompressedSize = getUncompressedSizeFromHeader();
}
}
bool ZipLocalFileHeader::searchCRCAndSizesAfterData() const
{
if (getCompressionMethod() == ZipCommon::CM_DEFLATE)
{
// check bit 3
return ((ZipUtil::get16BitValue(_rawHeader, GENERAL_PURPOSE_POS) & 0x0008) != 0);
}
return false;
}
void ZipLocalFileHeader::setFileName(const std::string& fileName, bool isDirectory)
{
poco_assert (!fileName.empty());
Poco::Path aPath(fileName);
if (isDirectory)
{
aPath.makeDirectory();
setCRC(0);
setCompressedSize(0);
setUncompressedSize(0);
setCompressionMethod(ZipCommon::CM_STORE);
setCompressionLevel(ZipCommon::CL_NORMAL);
}
else
{
aPath.makeFile();
}
_fileName = aPath.toString(Poco::Path::PATH_UNIX);
if (_fileName[0] == '/')
_fileName = _fileName.substr(1);
if (isDirectory)
{
poco_assert_dbg (_fileName[_fileName.size()-1] == '/');
}
setFileNameLength(static_cast<Poco::UInt16>(_fileName.size()));
}
void ZipLocalFileHeader::init( const Poco::Path& fName,
ZipCommon::CompressionMethod cm,
ZipCommon::CompressionLevel cl)
{
poco_assert (_fileName.empty());
setSearchCRCAndSizesAfterData(false);
Poco::Path fileName(fName);
fileName.setDevice(""); // clear device!
setFileName(fileName.toString(Poco::Path::PATH_UNIX), fileName.isDirectory());
setRequiredVersion(2, 0);
if (fileName.isFile())
{
setCompressionMethod(cm);
setCompressionLevel(cl);
}
else
setCompressionMethod(ZipCommon::CM_STORE);
}
std::string ZipLocalFileHeader::createHeader() const
{
std::string result(_rawHeader, FULLHEADER_SIZE);
result.append(_fileName);
result.append(_extraField);
return result;
}
} } // namespace Poco::Zip