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//
// ZipLocalFileHeader.h
//
// $Id: //poco/1.4/Zip/include/Poco/Zip/ZipLocalFileHeader.h#1 $
//
// Library: Zip
// Package: Zip
// Module: ZipLocalFileHeader
//
// Definition of the ZipLocalFileHeader class.
//
// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Zip_ZipLocalFileHeader_INCLUDED
#define Zip_ZipLocalFileHeader_INCLUDED
#include "Poco/Zip/Zip.h"
#include "Poco/Zip/ZipUtil.h"
#include "Poco/Zip/ZipCommon.h"
#include "Poco/DateTime.h"
#include "Poco/Path.h"
#include <istream>
namespace Poco {
namespace Zip {
class ParseCallback;
class Zip_API ZipLocalFileHeader
/// Stores a Zip local file header
{
public:
static const char HEADER[ZipCommon::HEADER_SIZE];
ZipLocalFileHeader(const Poco::Path& fileName, const Poco::DateTime& lastModifiedAt, ZipCommon::CompressionMethod cm, ZipCommon::CompressionLevel cl);
/// Creates a zip file header from an absoluteFile. fileName is the name of the file in the zip, outputIsSeekable determines if we write
/// CRC and file sizes to the LocalFileHeader or after data compression into a ZipDataInfo
ZipLocalFileHeader(std::istream& inp, bool assumeHeaderRead, ParseCallback& callback);
/// Creates the ZipLocalFileHeader by parsing the input stream.
/// If assumeHeaderRead is true we assume that the first 4 bytes were already read outside.
/// If skipOverDataBlock is true we position the stream after the data block (either at the next FileHeader or the Directory Entry)
virtual ~ZipLocalFileHeader();
/// Destroys the ZipLocalFileHeader.
ZipCommon::HostSystem getHostSystem() const;
int getMajorVersionNumber() const;
int getMinorVersionNumber() const;
void getRequiredVersion(int& major, int& minor);
/// The minimum version required to extract the data
Poco::UInt32 getHeaderSize() const;
/// Returns the total size of the header including filename + extra field size
void setStartPos(std::streamoff start);
/// Sets the start position to start and the end position to start+compressedSize
std::streamoff getStartPos() const;
/// Returns the position of the first byte of the header in the file stream
std::streamoff getEndPos() const;
/// Points past the last byte of the file entry (ie. either the first byte of the next header, or the directory)
std::streamoff getDataStartPos() const;
/// Returns the streamoffset for the very first byte of data. Will be equal to DataEndPos if no data present
std::streamoff getDataEndPos() const;
ZipCommon::CompressionMethod getCompressionMethod() const;
ZipCommon::CompressionLevel getCompressionLevel() const;
/// Returns the compression level used. Only valid when the compression method is CM_DEFLATE
bool isEncrypted() const;
const Poco::DateTime& lastModifiedAt() const;
Poco::UInt32 getCRC() const;
Poco::UInt32 getCompressedSize() const;
Poco::UInt32 getUncompressedSize() const;
void setCRC(Poco::UInt32 val);
void setCompressedSize(Poco::UInt32 val);
void setUncompressedSize(Poco::UInt32 val);
const std::string& getFileName() const;
bool isFile() const;
bool isDirectory() const;
bool hasExtraField() const;
const std::string& getExtraField() const;
bool hasData() const;
bool searchCRCAndSizesAfterData() const;
void setSearchCRCAndSizesAfterData(bool val);
void setFileName(const std::string& fileName, bool isDirectory);
std::string createHeader() const;
/// Creates a header
private:
void parse(std::istream& inp, bool assumeHeaderRead);
void parseDateTime();
void init(const Poco::Path& fileName, ZipCommon::CompressionMethod cm, ZipCommon::CompressionLevel cl);
Poco::UInt16 getFileNameLength() const;
Poco::UInt16 getExtraFieldLength() const;
Poco::UInt32 getCRCFromHeader() const;
Poco::UInt32 getCompressedSizeFromHeader() const;
Poco::UInt32 getUncompressedSizeFromHeader() const;
void setRequiredVersion(int major, int minor);
void setHostSystem(ZipCommon::HostSystem hs);
void setLastModifiedAt(const Poco::DateTime& dt);
void setEncryption(bool val);
void setFileNameLength(Poco::UInt16 size);
void setExtraFieldSize(Poco::UInt16 size);
void setCompressionMethod(ZipCommon::CompressionMethod cm);
void setCompressionLevel(ZipCommon::CompressionLevel cl);
private:
enum
{
HEADER_POS = 0,
VERSION_SIZE = 2,
VERSION_POS = HEADER_POS+ZipCommon::HEADER_SIZE,
GENERAL_PURPOSE_SIZE = 2,
GENERAL_PURPOSE_POS = VERSION_POS + VERSION_SIZE,
COMPR_METHOD_SIZE = 2,
COMPR_METHOD_POS = GENERAL_PURPOSE_POS + GENERAL_PURPOSE_SIZE,
LASTMODEFILETIME_SIZE = 2,
LASTMODEFILETIME_POS = COMPR_METHOD_POS + COMPR_METHOD_SIZE,
LASTMODEFILEDATE_SIZE = 2,
LASTMODEFILEDATE_POS = LASTMODEFILETIME_POS + LASTMODEFILETIME_SIZE,
CRC32_SIZE = 4,
CRC32_POS = LASTMODEFILEDATE_POS + LASTMODEFILEDATE_SIZE,
COMPRESSEDSIZE_SIZE = 4,
COMPRESSEDSIZE_POS = CRC32_POS + CRC32_SIZE,
UNCOMPRESSEDSIZE_SIZE = 4,
UNCOMPRESSEDSIZE_POS = COMPRESSEDSIZE_POS + COMPRESSEDSIZE_SIZE,
FILELENGTH_SIZE = 2,
FILELENGTH_POS = UNCOMPRESSEDSIZE_POS + UNCOMPRESSEDSIZE_SIZE,
EXTRAFIELD_LENGTH = 2,
EXTRAFIELD_POS = FILELENGTH_POS + FILELENGTH_SIZE,
FULLHEADER_SIZE = 30
};
char _rawHeader[FULLHEADER_SIZE];
std::streamoff _startPos;
std::streamoff _endPos;
std::string _fileName;
Poco::DateTime _lastModifiedAt;
std::string _extraField;
Poco::UInt32 _crc32;
Poco::UInt32 _compressedSize;
Poco::UInt32 _uncompressedSize;
};
inline void ZipLocalFileHeader::setFileNameLength(Poco::UInt16 size)
{
ZipUtil::set16BitValue(size, _rawHeader, FILELENGTH_POS);
}
inline void ZipLocalFileHeader::setExtraFieldSize(Poco::UInt16 size)
{
ZipUtil::set16BitValue(size, _rawHeader, EXTRAFIELD_POS);
}
inline ZipCommon::HostSystem ZipLocalFileHeader::getHostSystem() const
{
return static_cast<ZipCommon::HostSystem>(_rawHeader[VERSION_POS + 1]);
}
inline void ZipLocalFileHeader::setHostSystem(ZipCommon::HostSystem hs)
{
_rawHeader[VERSION_POS + 1] = static_cast<char>(hs);
}
inline int ZipLocalFileHeader::getMajorVersionNumber() const
{
return (_rawHeader[VERSION_POS]/10);
}
inline int ZipLocalFileHeader::getMinorVersionNumber() const
{
return (_rawHeader[VERSION_POS]%10);
}
inline void ZipLocalFileHeader::getRequiredVersion(int& major, int& minor)
{
major = getMajorVersionNumber();
minor = getMinorVersionNumber();
}
inline void ZipLocalFileHeader::setRequiredVersion(int major, int minor)
{
poco_assert (minor < 10);
poco_assert (major < 24);
_rawHeader[VERSION_POS] = static_cast<char>(static_cast<unsigned char>(major)*10+static_cast<unsigned char>(minor));
}
inline Poco::UInt16 ZipLocalFileHeader::getFileNameLength() const
{
return ZipUtil::get16BitValue(_rawHeader, FILELENGTH_POS);
}
inline Poco::UInt16 ZipLocalFileHeader::getExtraFieldLength() const
{
return ZipUtil::get16BitValue(_rawHeader, EXTRAFIELD_POS);
}
inline Poco::UInt32 ZipLocalFileHeader::getHeaderSize() const
{
return FULLHEADER_SIZE+getExtraFieldLength()+getFileNameLength();
}
inline std::streamoff ZipLocalFileHeader::getStartPos() const
{
return _startPos;
}
inline void ZipLocalFileHeader::setStartPos(std::streamoff start)
{
_startPos = start;
_endPos = start + getHeaderSize()+getCompressedSize();
}
inline std::streamoff ZipLocalFileHeader::getEndPos() const
{
return _endPos;
}
inline void ZipLocalFileHeader::parseDateTime()
{
_lastModifiedAt = ZipUtil::parseDateTime(_rawHeader, LASTMODEFILETIME_POS, LASTMODEFILEDATE_POS);
}
inline void ZipLocalFileHeader::setLastModifiedAt(const Poco::DateTime& dt)
{
_lastModifiedAt = dt;
ZipUtil::setDateTime(dt, _rawHeader, LASTMODEFILETIME_POS, LASTMODEFILEDATE_POS);
}
inline ZipCommon::CompressionMethod ZipLocalFileHeader::getCompressionMethod() const
{
return static_cast<ZipCommon::CompressionMethod>(ZipUtil::get16BitValue(_rawHeader, COMPR_METHOD_POS));
}
inline ZipCommon::CompressionLevel ZipLocalFileHeader::getCompressionLevel() const
{
// bit 1 and 2 indicate the level
return static_cast<ZipCommon::CompressionLevel>((ZipUtil::get16BitValue(_rawHeader, GENERAL_PURPOSE_POS)>>1) & 0x0003);
}
inline void ZipLocalFileHeader::setCompressionMethod(ZipCommon::CompressionMethod cm)
{
ZipUtil::set16BitValue(static_cast<Poco::UInt16>(cm), _rawHeader, COMPR_METHOD_POS);
}
inline void ZipLocalFileHeader::setCompressionLevel(ZipCommon::CompressionLevel cl)
{
// bit 1 and 2 indicate the level
Poco::UInt16 val = static_cast<Poco::UInt16>(cl);
val <<= 1;
Poco::UInt16 mask = 0xfff9;
_rawHeader[GENERAL_PURPOSE_POS] = ((_rawHeader[GENERAL_PURPOSE_POS] & mask) | val);
}
inline bool ZipLocalFileHeader::isEncrypted() const
{
// bit 0 indicates encryption
return ((ZipUtil::get16BitValue(_rawHeader, GENERAL_PURPOSE_POS) & 0x0001) != 0);
}
inline void ZipLocalFileHeader::setEncryption(bool val)
{
if (val)
_rawHeader[GENERAL_PURPOSE_POS] |= 0x01;
else
_rawHeader[GENERAL_PURPOSE_POS] &= 0xfe;
}
inline void ZipLocalFileHeader::setSearchCRCAndSizesAfterData(bool val)
{
//set bit 3 of general purpose reg
if (val)
_rawHeader[GENERAL_PURPOSE_POS] |= 0x08;
else
_rawHeader[GENERAL_PURPOSE_POS] &= 0xf7;
}
inline const Poco::DateTime& ZipLocalFileHeader::lastModifiedAt() const
{
return _lastModifiedAt;
}
inline Poco::UInt32 ZipLocalFileHeader::getCRC() const
{
return _crc32;
}
inline Poco::UInt32 ZipLocalFileHeader::getCompressedSize() const
{
return _compressedSize;
}
inline Poco::UInt32 ZipLocalFileHeader::getUncompressedSize() const
{
return _uncompressedSize;
}
inline void ZipLocalFileHeader::setCRC(Poco::UInt32 val)
{
_crc32 = val;
ZipUtil::set32BitValue(val, _rawHeader, CRC32_POS);
}
inline void ZipLocalFileHeader::setCompressedSize(Poco::UInt32 val)
{
_compressedSize = val;
ZipUtil::set32BitValue(val, _rawHeader, COMPRESSEDSIZE_POS);
}
inline void ZipLocalFileHeader::setUncompressedSize(Poco::UInt32 val)
{
_uncompressedSize = val;
ZipUtil::set32BitValue(val, _rawHeader, UNCOMPRESSEDSIZE_POS);
}
inline Poco::UInt32 ZipLocalFileHeader::getCRCFromHeader() const
{
return ZipUtil::get32BitValue(_rawHeader, CRC32_POS);
}
inline Poco::UInt32 ZipLocalFileHeader::getCompressedSizeFromHeader() const
{
return ZipUtil::get32BitValue(_rawHeader, COMPRESSEDSIZE_POS);
}
inline Poco::UInt32 ZipLocalFileHeader::getUncompressedSizeFromHeader() const
{
return ZipUtil::get32BitValue(_rawHeader, UNCOMPRESSEDSIZE_POS);
}
inline const std::string& ZipLocalFileHeader::getFileName() const
{
return _fileName;
}
inline bool ZipLocalFileHeader::isFile() const
{
return !isDirectory();
}
inline bool ZipLocalFileHeader::isDirectory() const
{
poco_assert_dbg(!_fileName.empty());
return getUncompressedSize() == 0 && getCompressionMethod() == ZipCommon::CM_STORE && _fileName[_fileName.length()-1] == '/';
}
inline bool ZipLocalFileHeader::hasExtraField() const
{
return getExtraFieldLength() > 0;
}
inline const std::string& ZipLocalFileHeader::getExtraField() const
{
return _extraField;
}
inline bool ZipLocalFileHeader::hasData() const
{
return (getCompressedSize() > 0);
}
inline std::streamoff ZipLocalFileHeader::getDataStartPos() const
{
return getStartPos() + getHeaderSize();
}
inline std::streamoff ZipLocalFileHeader::getDataEndPos() const
{
return getDataStartPos()+getCompressedSize();
}
} } // namespace Poco::Zip
#endif // Zip_ZipLocalFileHeader_INCLUDED