// Rar5Handler.h

#ifndef __RAR5_HANDLER_H
#define __RAR5_HANDLER_H

#include "../../../../C/Blake2.h"

#include "../../../Common/MyBuffer.h"

#include "../../../Windows/PropVariant.h"

#include "../../Common/CreateCoder.h"

#include "../IArchive.h"

namespace NArchive {
namespace NRar5 {

namespace NHeaderFlags
{
  const unsigned kExtra   = 1 << 0;
  const unsigned kData    = 1 << 1;
  // const unsigned kUnknown = 1 << 2;
  const unsigned kPrevVol = 1 << 3;
  const unsigned kNextVol = 1 << 4;
  // const unsigned kIsChild = 1 << 5;
  // const unsigned kPreserveChild = 1 << 6;
}
  
namespace NHeaderType
{
  enum
  {
    kArc = 1,
    kFile,
    kService,
    kArcEncrypt,
    kEndOfArc
  };
}

namespace NArcFlags
{
  const unsigned kVol       = 1 << 0;
  const unsigned kVolNumber = 1 << 1;
  const unsigned kSolid     = 1 << 2;
  // const unsigned kRecovery  = 1 << 3;
  // const unsigned kLocked    = 1 << 4;
}

const unsigned kArcExtraRecordType_Locator = 1;

namespace NLocatorFlags
{
  const unsigned kQuickOpen  = 1 << 0;
  const unsigned kRecovery   = 1 << 1;
}

namespace NFileFlags
{
  const unsigned kIsDir    = 1 << 0;
  const unsigned kUnixTime = 1 << 1;
  const unsigned kCrc32    = 1 << 2;
  const unsigned kUnknownSize = 1 << 3;
}

namespace NMethodFlags
{
  // const unsigned kVersionMask = 0x3F;
  const unsigned kSolid = 1 << 6;
}

namespace NArcEndFlags
{
  const unsigned kMoreVols = 1 << 0;
}

enum EHostOS
{
  kHost_Windows = 0,
  kHost_Unix
};



// ---------- Extra ----------

namespace NExtraRecordType
{
  enum
  {
    kCrypto = 1,
    kHash,
    kTime,
    kVersion,
    kLink,
    kUnixOwner,
    kSubdata
  };
}

// const unsigned kCryptoAlgo_AES = 0;

namespace NCryptoFlags
{
  const unsigned kPswCheck = 1 << 0;
  const unsigned kUseMAC   = 1 << 1;
}

struct CCryptoInfo
{
  UInt64 Algo;
  UInt64 Flags;
  Byte Cnt;

  bool UseMAC()       const { return (Flags & NCryptoFlags::kUseMAC) != 0; }
  bool IsThereCheck() const { return (Flags & NCryptoFlags::kPswCheck) != 0; }
  bool Parse(const Byte *p, size_t size);
};

const unsigned kHashID_Blake2sp = 0;

namespace NTimeRecord
{
  enum
  {
    k_Index_MTime = 0,
    k_Index_CTime,
    k_Index_ATime
  };
  
  namespace NFlags
  {
    const unsigned kUnixTime = 1 << 0;
    const unsigned kMTime    = 1 << 1;
    // const unsigned kCTime    = 1 << 2;
    // const unsigned kATime    = 1 << 3;
  }
}

namespace NLinkType
{
  enum
  {
    kUnixSymLink = 1,
    kWinSymLink,
    kWinJunction,
    kHardLink,
    kFileCopy
  };
}

namespace NLinkFlags
{
  const unsigned kTargetIsDir = 1 << 0;
}


struct CItem
{
  UInt32 CommonFlags;
  UInt32 Flags;

  Byte RecordType;
  bool Version_Defined;

  int ACL;

  AString Name;

  int VolIndex;
  int NextItem;

  UInt32 UnixMTime;
  UInt32 CRC;
  UInt32 Attrib;
  UInt32 Method;

  CByteBuffer Extra;

  UInt64 Size;
  UInt64 PackSize;
  UInt64 HostOS;
  
  UInt64 DataPos;
  UInt64 Version;

  CItem() { Clear(); }

  void Clear()
  {
    CommonFlags = 0;
    Flags = 0;
    
    VolIndex = 0;
    NextItem = -1;

    Version_Defined = false;
    Version = 0;

    Name.Empty();
    Extra.Free();
    ACL = -1;
  }

  bool IsSplitBefore()  const { return (CommonFlags & NHeaderFlags::kPrevVol) != 0; }
  bool IsSplitAfter()   const { return (CommonFlags & NHeaderFlags::kNextVol) != 0; }
  bool IsSplit()        const { return (CommonFlags & (NHeaderFlags::kPrevVol | NHeaderFlags::kNextVol)) != 0; }

  bool IsDir()          const { return (Flags & NFileFlags::kIsDir) != 0; }
  bool Has_UnixMTime()  const { return (Flags & NFileFlags::kUnixTime) != 0; }
  bool Has_CRC()        const { return (Flags & NFileFlags::kCrc32) != 0; }
  bool Is_UnknownSize() const { return (Flags & NFileFlags::kUnknownSize) != 0; }

  bool IsNextForItem(const CItem &prev) const
  {
    return !IsDir() && !prev.IsDir() && IsSplitBefore() && prev.IsSplitAfter() && (Name == prev.Name);
      // && false;
  }

  bool IsSolid() const { return ((UInt32)Method & NMethodFlags::kSolid) != 0; }
  unsigned GetAlgoVersion() const { return (unsigned)Method & 0x3F; }
  unsigned GetMethod() const { return ((unsigned)Method >> 7) & 0x7; }
  UInt32 GetDictSize() const { return (((UInt32)Method >> 10) & 0xF); }

  bool IsService() const { return RecordType == NHeaderType::kService; }
  
  bool Is_STM() const { return IsService() && Name == "STM"; }
  bool Is_CMT() const { return IsService() && Name == "CMT"; }
  bool Is_ACL() const { return IsService() && Name == "ACL"; }
  // bool Is_QO()  const { return IsService() && Name == "QO"; }

  int FindExtra(unsigned type, unsigned &recordDataSize) const;

  bool IsEncrypted() const
  {
    unsigned size;
    return FindExtra(NExtraRecordType::kCrypto, size) >= 0;
  }

  int FindExtra_Blake() const
  {
    unsigned size = 0;
    int offset = FindExtra(NExtraRecordType::kHash, size);
    if (offset >= 0
        && size == BLAKE2S_DIGEST_SIZE + 1
        && Extra[(unsigned)offset] == kHashID_Blake2sp)
      return offset + 1;
    return -1;
  }

  bool FindExtra_Version(UInt64 &version) const;

  struct CLinkInfo
  {
    UInt64 Type;
    UInt64 Flags;
    unsigned NameOffset;
    unsigned NameLen;
  };

  bool FindExtra_Link(CLinkInfo &link) const;
  void Link_to_Prop(unsigned linkType, NWindows::NCOM::CPropVariant &prop) const;
  bool Is_CopyLink() const;
  bool Is_HardLink() const;
  bool Is_CopyLink_or_HardLink() const;

  bool NeedUse_as_CopyLink() const { return PackSize == 0 && Is_CopyLink(); }
  bool NeedUse_as_HardLink() const { return PackSize == 0 && Is_HardLink(); }
  bool NeedUse_as_CopyLink_or_HardLink() const { return PackSize == 0 && Is_CopyLink_or_HardLink(); }

  bool GetAltStreamName(AString &name) const;

  UInt32 GetWinAttrib() const
  {
    UInt32 a;
    switch (HostOS)
    {
      case kHost_Windows: a = Attrib; break;
      case kHost_Unix: a = (Attrib << 16); break;
      default: a = 0;
    }
    // if (IsDir()) a |= FILE_ATTRIBUTE_DIRECTORY;
    return a;
  }

  UInt64 GetDataPosition() const { return DataPos; }
};


struct CInArcInfo
{
  UInt64 Flags;
  UInt64 VolNumber;
  UInt64 StartPos;
  UInt64 EndPos;

  UInt64 EndFlags;
  bool EndOfArchive_was_Read;

  bool IsEncrypted;

  // CByteBuffer Extra;

  /*
  struct CLocator
  {
    UInt64 Flags;
    UInt64 QuickOpen;
    UInt64 Recovery;
    
    bool Is_QuickOpen() const { return (Flags & NLocatorFlags::kQuickOpen) != 0; }
    bool Is_Recovery() const { return (Flags & NLocatorFlags::kRecovery) != 0; }
  };

  int FindExtra(unsigned type, unsigned &recordDataSize) const;
  bool FindExtra_Locator(CLocator &locator) const;
  */

  CInArcInfo():
    Flags(0),
    VolNumber(0),
    StartPos(0),
    EndPos(0),
    EndFlags(0),
    EndOfArchive_was_Read(false),
    IsEncrypted(false)
      {}

  /*
  void Clear()
  {
    Flags = 0;
    VolNumber = 0;
    StartPos = 0;
    EndPos = 0;
    EndFlags = 0;
    EndOfArchive_was_Read = false;
    Extra.Free();
  }
  */

  UInt64 GetPhySize() const { return EndPos - StartPos; }

  bool AreMoreVolumes()  const { return (EndFlags & NArcEndFlags::kMoreVols) != 0; }

  bool IsVolume()             const { return (Flags & NArcFlags::kVol) != 0; }
  bool IsSolid()              const { return (Flags & NArcFlags::kSolid) != 0; }
  bool Is_VolNumber_Defined() const { return (Flags & NArcFlags::kVolNumber) != 0; }

  UInt64 GetVolIndex() const { return Is_VolNumber_Defined() ? VolNumber : 0; }
};


struct CRefItem
{
  unsigned Item;
  unsigned Last;
  int Parent;
  int Link;
};


struct CArc
{
  CMyComPtr<IInStream> Stream;
  CInArcInfo Info;
};


class CHandler:
  public IInArchive,
  public IArchiveGetRawProps,
  PUBLIC_ISetCompressCodecsInfo
  public CMyUnknownImp
{
public:
  CRecordVector<CRefItem> _refs;
  CObjectVector<CItem> _items;
private:
  CObjectVector<CArc> _arcs;
  CObjectVector<CByteBuffer> _acls;

  UInt32 _errorFlags;
  // UInt32 _warningFlags;
  bool _isArc;
  CByteBuffer _comment;
  UString _missingVolName;

  DECL_EXTERNAL_CODECS_VARS

  UInt64 GetPackSize(unsigned refIndex) const;
  
  void FillLinks();
  
  HRESULT Open2(IInStream *stream,
      const UInt64 *maxCheckStartPosition,
      IArchiveOpenCallback *openCallback);

public:
  MY_QUERYINTERFACE_BEGIN2(IInArchive)
  MY_QUERYINTERFACE_ENTRY(IArchiveGetRawProps)
  QUERY_ENTRY_ISetCompressCodecsInfo
  MY_QUERYINTERFACE_END
  MY_ADDREF_RELEASE
  
  INTERFACE_IInArchive(;)
  INTERFACE_IArchiveGetRawProps(;)

  DECL_ISetCompressCodecsInfo
};

}}

#endif