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// Archive/ZipItem.h
#ifndef __ARCHIVE_ZIP_ITEM_H
#define __ARCHIVE_ZIP_ITEM_H
#include "Common/Types.h"
#include "Common/String.h"
#include "Common/Buffer.h"
#include "ZipHeader.h"
namespace NArchive {
namespace NZip {
struct CVersion
{
Byte Version;
Byte HostOS;
};
bool operator==(const CVersion &v1, const CVersion &v2);
bool operator!=(const CVersion &v1, const CVersion &v2);
struct CExtraSubBlock
{
UInt16 ID;
CByteBuffer Data;
};
struct CWzAesExtraField
{
UInt16 VendorVersion; // 0x0001 - AE-1, 0x0002 - AE-2,
// UInt16 VendorId; // "AE"
Byte Strength; // 1 - 128-bit , 2 - 192-bit , 3 - 256-bit
UInt16 Method;
CWzAesExtraField(): VendorVersion(2), Strength(3), Method(0) {}
bool NeedCrc() const { return (VendorVersion == 1); }
bool ParseFromSubBlock(const CExtraSubBlock &sb)
{
if (sb.ID != NFileHeader::NExtraID::kWzAES)
return false;
if (sb.Data.GetCapacity() < 7)
return false;
const Byte *p = (const Byte *)sb.Data;
VendorVersion = (((UInt16)p[1]) << 8) | p[0];
if (p[2] != 'A' || p[3] != 'E')
return false;
Strength = p[4];
Method = (((UInt16)p[6]) << 16) | p[5];
return true;
}
void SetSubBlock(CExtraSubBlock &sb) const
{
sb.Data.SetCapacity(7);
sb.ID = NFileHeader::NExtraID::kWzAES;
Byte *p = (Byte *)sb.Data;
p[0] = (Byte)VendorVersion;
p[1] = (Byte)(VendorVersion >> 8);
p[2] = 'A';
p[3] = 'E';
p[4] = Strength;
p[5] = (Byte)Method;
p[6] = (Byte)(Method >> 8);
}
};
struct CExtraBlock
{
CObjectVector<CExtraSubBlock> SubBlocks;
void Clear() { SubBlocks.Clear(); }
size_t GetSize() const
{
size_t res = 0;
for (int i = 0; i < SubBlocks.Size(); i++)
res += SubBlocks[i].Data.GetCapacity() + 2 + 2;
return res;
}
bool GetWzAesField(CWzAesExtraField &aesField) const
{
// size_t res = 0;
for (int i = 0; i < SubBlocks.Size(); i++)
if (aesField.ParseFromSubBlock(SubBlocks[i]))
return true;
return false;
}
bool HasWzAesField() const
{
CWzAesExtraField aesField;
return GetWzAesField(aesField);
}
void RemoveUnknownSubBlocks()
{
for (int i = SubBlocks.Size() - 1; i >= 0;)
{
const CExtraSubBlock &subBlock = SubBlocks[i];
if (subBlock.ID != NFileHeader::NExtraID::kWzAES)
SubBlocks.Delete(i);
else
i--;
}
}
};
class CLocalItem
{
public:
CVersion ExtractVersion;
UInt16 Flags;
UInt16 CompressionMethod;
UInt32 Time;
UInt32 FileCRC;
UInt64 PackSize;
UInt64 UnPackSize;
AString Name;
CExtraBlock LocalExtra;
bool IsEncrypted() const;
bool IsImplodeBigDictionary() const;
bool IsImplodeLiteralsOn() const;
bool IsDirectory() const;
bool IgnoreItem() const { return false; }
UInt32 GetWinAttributes() const;
bool HasDescriptor() const;
private:
void SetFlagBits(int startBitNumber, int numBits, int value);
void SetBitMask(int bitMask, bool enable);
public:
void ClearFlags() { Flags = 0; }
void SetEncrypted(bool encrypted);
WORD GetCodePage() const
{
return CP_OEMCP;
}
};
class CItem: public CLocalItem
{
public:
CVersion MadeByVersion;
UInt16 InternalAttributes;
UInt32 ExternalAttributes;
UInt64 LocalHeaderPosition;
CExtraBlock CentralExtra;
CByteBuffer Comment;
bool FromLocal;
bool FromCentral;
bool IsDirectory() const;
UInt32 GetWinAttributes() const;
bool IsThereCrc() const
{
if (CompressionMethod == NFileHeader::NCompressionMethod::kWzAES)
{
CWzAesExtraField aesField;
if (CentralExtra.GetWzAesField(aesField))
return aesField.NeedCrc();
}
return true;
}
WORD GetCodePage() const
{
return (WORD)((MadeByVersion.HostOS == NFileHeader::NHostOS::kFAT
|| MadeByVersion.HostOS == NFileHeader::NHostOS::kNTFS
) ? CP_OEMCP : CP_ACP);
}
CItem() : FromLocal(false), FromCentral(false) {}
};
}}
#endif
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