rarhandler.cpp

7-Zip 是一款号称有着现今最高压缩比的压缩软件

// RarHandler.cpp

#include "StdAfx.h"

#include "RarHandler.h"

#include "Common/StringConvert.h"
#include "Common/ComTry.h"
#include "Common/IntToString.h"

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

#include "../../IPassword.h"
#include "../../Common/ProgressUtils.h"
#include "../../Common/CreateCoder.h"
#include "../../Common/MethodId.h"
#include "../../Common/FilterCoder.h"
#include "../../Compress/Copy/CopyCoder.h"
#include "../../Crypto/Rar20/Rar20Cipher.h"
#include "../../Crypto/RarAES/RarAES.h"
#include "../Common/OutStreamWithCRC.h"
#include "../Common/ItemNameUtils.h"

using namespace NWindows;
using namespace NTime;

namespace NArchive {
namespace NRar {

static const wchar_t *kHostOS[] =
{
  L"MS DOS",
  L"OS/2",
  L"Win32",
  L"Unix",
  L"Mac OS",
  L"BeOS"
};

static const int kNumHostOSes = sizeof(kHostOS) / sizeof(kHostOS[0]);

static const wchar_t *kUnknownOS = L"Unknown";

STATPROPSTG kProps[] =
{
  { NULL, kpidPath, VT_BSTR},
  { NULL, kpidIsDir, VT_BOOL},
  { NULL, kpidSize, VT_UI8},
  { NULL, kpidPackSize, VT_UI8},
  { NULL, kpidMTime, VT_FILETIME},
  { NULL, kpidCTime, VT_FILETIME},
  { NULL, kpidATime, VT_FILETIME},
  { NULL, kpidAttrib, VT_UI4},

  { NULL, kpidEncrypted, VT_BOOL},
  { NULL, kpidSolid, VT_BOOL},
  { NULL, kpidCommented, VT_BOOL},
  { NULL, kpidSplitBefore, VT_BOOL},
  { NULL, kpidSplitAfter, VT_BOOL},
  { NULL, kpidCRC, VT_UI4},
  { NULL, kpidHostOS, VT_BSTR},
  { NULL, kpidMethod, VT_BSTR},
  { NULL, kpidUnpackVer, VT_UI1}
};

STATPROPSTG kArcProps[] =
{
  { NULL, kpidSolid, VT_BOOL},
  { NULL, kpidNumBlocks, VT_UI4},
  // { NULL, kpidEncrypted, VT_BOOL},
  { NULL, kpidIsVolume, VT_BOOL},
  { NULL, kpidNumVolumes, VT_UI4},
  { NULL, kpidPhySize, VT_UI8}
  // { NULL, kpidCommented, VT_BOOL}
};

IMP_IInArchive_Props
IMP_IInArchive_ArcProps

UInt64 CHandler::GetPackSize(int refIndex) const
{
  const CRefItem &refItem = _refItems[refIndex];
  UInt64 totalPackSize = 0;
  for (int i = 0; i < refItem.NumItems; i++)
    totalPackSize += _items[refItem.ItemIndex + i].PackSize;
  return totalPackSize;
}

STDMETHODIMP CHandler::GetArchiveProperty(PROPID propID, PROPVARIANT *value)
{
  // COM_TRY_BEGIN
  NWindows::NCOM::CPropVariant prop;
  switch(propID)
  {
    case kpidSolid: prop = _archiveInfo.IsSolid(); break;
    // case kpidEncrypted: prop = _archiveInfo.IsEncrypted(); break; // it's for encrypted names.
    case kpidIsVolume: prop = _archiveInfo.IsVolume(); break;
    case kpidNumVolumes: prop = (UInt32)_archives.Size(); break;
    case kpidOffset: if (_archiveInfo.StartPosition != 0) prop = _archiveInfo.StartPosition; break;
    // case kpidCommented: prop = _archiveInfo.IsCommented(); break;
    case kpidNumBlocks:
    {
      UInt32 numBlocks = 0;
      for (int i = 0; i < _refItems.Size(); i++)
        if (!IsSolid(i))
          numBlocks++;
      prop = (UInt32)numBlocks;
      break;
    }
  }
  prop.Detach(value);
  return S_OK;
  // COM_TRY_END
}

STDMETHODIMP CHandler::GetNumberOfItems(UInt32 *numItems)
{
  *numItems = _refItems.Size();
  return S_OK;
}

static bool RarTimeToFileTime(const CRarTime &rarTime, FILETIME &result)
{
  if (!DosTimeToFileTime(rarTime.DosTime, result))
    return false;
  UInt64 value =  (((UInt64)result.dwHighDateTime) << 32) + result.dwLowDateTime;
  value += (UInt64)rarTime.LowSecond * 10000000;
  value += ((UInt64)rarTime.SubTime[2] << 16) +
    ((UInt64)rarTime.SubTime[1] << 8) +
    ((UInt64)rarTime.SubTime[0]);
  result.dwLowDateTime = (DWORD)value;
  result.dwHighDateTime = DWORD(value >> 32);
  return true;
}

static void RarTimeToProp(const CRarTime &rarTime, NWindows::NCOM::CPropVariant &prop)
{
  FILETIME localFileTime, utcFileTime;
  if (RarTimeToFileTime(rarTime, localFileTime))
  {
    if (!LocalFileTimeToFileTime(&localFileTime, &utcFileTime))
      utcFileTime.dwHighDateTime = utcFileTime.dwLowDateTime = 0;
  }
  else
    utcFileTime.dwHighDateTime = utcFileTime.dwLowDateTime = 0;
  prop = utcFileTime;
}

STDMETHODIMP CHandler::GetProperty(UInt32 index, PROPID propID,  PROPVARIANT *value)
{
  COM_TRY_BEGIN
  NWindows::NCOM::CPropVariant prop;
  const CRefItem &refItem = _refItems[index];
  const CItemEx &item = _items[refItem.ItemIndex];
  switch(propID)
  {
    case kpidPath:
    {
      UString u;
      if (item.HasUnicodeName() && !item.UnicodeName.IsEmpty())
        u = item.UnicodeName;
      else
        u = MultiByteToUnicodeString(item.Name, CP_OEMCP);
      prop = (const wchar_t *)NItemName::WinNameToOSName(u);
      break;
    }
    case kpidIsDir: prop = item.IsDir(); break;
    case kpidSize: prop = item.Size; break;
    case kpidPackSize: prop = GetPackSize(index); break;
    case kpidMTime: RarTimeToProp(item.MTime, prop); break;
    case kpidCTime: if (item.CTimeDefined) RarTimeToProp(item.CTime, prop); break;
    case kpidATime: if (item.ATimeDefined) RarTimeToProp(item.ATime, prop); break;
    case kpidAttrib: prop = item.GetWinAttributes(); break;
    case kpidEncrypted: prop = item.IsEncrypted(); break;
    case kpidSolid: prop = IsSolid(index); break;
    case kpidCommented: prop = item.IsCommented(); break;
    case kpidSplitBefore: prop = item.IsSplitBefore(); break;
    case kpidSplitAfter: prop = _items[refItem.ItemIndex + refItem.NumItems - 1].IsSplitAfter(); break;
    case kpidCRC:
    {
      const CItemEx &lastItem = _items[refItem.ItemIndex + refItem.NumItems - 1];
      prop = ((lastItem.IsSplitAfter()) ? item.FileCRC : lastItem.FileCRC);
      break;
    }
    case kpidUnpackVer: prop = item.UnPackVersion; break;
    case kpidMethod:
    {
      UString method;
      if (item.Method >= Byte('0') && item.Method <= Byte('5'))
      {
        method = L"m";
        wchar_t temp[32];
        ConvertUInt64ToString(item.Method - Byte('0'), temp);
        method += temp;
        if (!item.IsDir())
        {
          method += L":";
          ConvertUInt64ToString(16 + item.GetDictSize(), temp);
          method += temp;
        }
      }
      else
      {
        wchar_t temp[32];
        ConvertUInt64ToString(item.Method, temp);
        method += temp;
      }
      prop = method;
      break;
    }
    case kpidHostOS: prop = (item.HostOS < kNumHostOSes) ? (kHostOS[item.HostOS]) : kUnknownOS; break;
  }
  prop.Detach(value);
  return S_OK;
  COM_TRY_END
}

class CVolumeName
{
  bool _first;
  bool _newStyle;
  UString _unchangedPart;
  UString _changedPart;
  UString _afterPart;
public:
  CVolumeName(): _newStyle(true) {};

  bool InitName(const UString &name, bool newStyle)
  {
    _first = true;
    _newStyle = newStyle;
    int dotPos = name.ReverseFind('.');
    UString basePart = name;
    if (dotPos >= 0)
    {
      UString ext = name.Mid(dotPos + 1);
      if (ext.CompareNoCase(L"rar") == 0)
      {
        _afterPart = name.Mid(dotPos);
        basePart = name.Left(dotPos);
      }
      else if (ext.CompareNoCase(L"exe") == 0)
      {
        _afterPart = L".rar";
        basePart = name.Left(dotPos);
      }
      else if (!_newStyle)
      {
        if (ext.CompareNoCase(L"000") == 0 || ext.CompareNoCase(L"001") == 0)
        {
          _afterPart.Empty();
          _first = false;
          _changedPart = ext;
          _unchangedPart = name.Left(dotPos + 1);
          return true;
        }
      }
    }

    if (!_newStyle)
    {
      _afterPart.Empty();
      _unchangedPart = basePart + UString(L".");
      _changedPart = L"r00";
      return true;
    }

    int numLetters = 1;
    if (basePart.Right(numLetters) == L"1" || basePart.Right(numLetters) == L"0")
    {
      while (numLetters < basePart.Length())
      {
        if (basePart[basePart.Length() - numLetters - 1] != '0')
          break;
        numLetters++;
      }
    }
    else
      return false;
    _unchangedPart = basePart.Left(basePart.Length() - numLetters);
    _changedPart = basePart.Right(numLetters);
    return true;
  }

  UString GetNextName()
  {
    UString newName;
    if (_newStyle || !_first)
    {
      int i;
      int numLetters = _changedPart.Length();
      for (i = numLetters - 1; i >= 0; i--)
      {
        wchar_t c = _changedPart[i];
        if (c == L'9')
        {
          c = L'0';
          newName = c + newName;
          if (i == 0)
            newName = UString(L'1') + newName;
          continue;
        }
        c++;
        newName = UString(c) + newName;
        i--;
        for (; i >= 0; i--)
          newName = _changedPart[i] + newName;
        break;
      }
      _changedPart = newName;
    }
    _first = false;
    return _unchangedPart + _changedPart + _afterPart;
  }
};

HRESULT CHandler::Open2(IInStream *stream,
    const UInt64 *maxCheckStartPosition,
    IArchiveOpenCallback *openArchiveCallback)
{
  {
    CMyComPtr<IArchiveOpenVolumeCallback> openVolumeCallback;
    CMyComPtr<ICryptoGetTextPassword> getTextPassword;
    CMyComPtr<IArchiveOpenCallback> openArchiveCallbackWrap = openArchiveCallback;
    
    CVolumeName seqName;

    UInt64 totalBytes = 0;
    UInt64 curBytes = 0;

    if (openArchiveCallback != NULL)
    {
      openArchiveCallbackWrap.QueryInterface(IID_IArchiveOpenVolumeCallback, &openVolumeCallback);
      openArchiveCallbackWrap.QueryInterface(IID_ICryptoGetTextPassword, &getTextPassword);
    }

    for (;;)
    {
      CMyComPtr<IInStream> inStream;
      if (!_archives.IsEmpty())
      {
        if (!openVolumeCallback)
          break;
        
        if(_archives.Size() == 1)
        {
          if (!_archiveInfo.IsVolume())
            break;
          UString baseName;
          {
            NCOM::CPropVariant prop;
            RINOK(openVolumeCallback->GetProperty(kpidName, &prop));
            if (prop.vt != VT_BSTR)
              break;
            baseName = prop.bstrVal;
          }
          seqName.InitName(baseName, _archiveInfo.HaveNewVolumeName());
        }

        UString fullName = seqName.GetNextName();
        HRESULT result = openVolumeCallback->GetStream(fullName, &inStream);
        if (result == S_FALSE)
          break;
        if (result != S_OK)
          return result;
        if (!stream)
          break;
      }
      else
        inStream = stream;

      UInt64 endPos = 0;
      if (openArchiveCallback != NULL)
      {
        RINOK(stream->Seek(0, STREAM_SEEK_END, &endPos));
        RINOK(stream->Seek(0, STREAM_SEEK_SET, NULL));
        totalBytes += endPos;
        RINOK(openArchiveCallback->SetTotal(NULL, &totalBytes));
      }
      
      NArchive::NRar::CInArchive archive;
      RINOK(archive.Open(inStream, maxCheckStartPosition));

      if (_archives.IsEmpty())
        archive.GetArchiveInfo(_archiveInfo);
     
      CItemEx item;
      for (;;)
      {
        HRESULT result = archive.GetNextItem(item, getTextPassword);
        if (result == S_FALSE)
          break;
        RINOK(result);
        if (item.IgnoreItem())
          continue;

        bool needAdd = true;
        if (item.IsSplitBefore())
        {
          if (!_refItems.IsEmpty())
          {
            CRefItem &refItem = _refItems.Back();
            refItem.NumItems++;
            needAdd = false;
          }
        }
        if (needAdd)
        {
          CRefItem refItem;
          refItem.ItemIndex = _items.Size();
          refItem.NumItems = 1;
          refItem.VolumeIndex = _archives.Size();
          _refItems.Add(refItem);
        }
        _items.Add(item);