9.04 beta

2025-12-06 15:14:59 -06:00 · 2009-06-02 00:00:00 +00:00
parent 8874e4fbc9
commit 829409452d
440 changed files with 19803 additions and 9941 deletions
--- a/CPP/7zip/Archive/GzHandler.cpp
+++ b/CPP/7zip/Archive/GzHandler.cpp
@@ -0,0 +1,820 @@
+// GzHandler.cpp
+
+#include "StdAfx.h"
+
+#include "../../../C/CpuArch.h"
+
+#include "Common/ComTry.h"
+#include "Common/StringConvert.h"
+
+#include "Windows/PropVariant.h"
+#include "Windows/Time.h"
+
+#include "../Common/ProgressUtils.h"
+#include "../Common/RegisterArc.h"
+#include "../Common/StreamUtils.h"
+
+#include "../Compress/CopyCoder.h"
+#include "../Compress/DeflateDecoder.h"
+#include "../Compress/DeflateEncoder.h"
+
+#include "Common/InStreamWithCRC.h"
+#include "Common/OutStreamWithCRC.h"
+#include "Common/ParseProperties.h"
+
+#define Get32(p) GetUi32(p)
+
+using namespace NWindows;
+
+namespace NArchive {
+namespace NGz {
+
+static const UInt16 kSignature = 0x8B1F;
+
+namespace NHeader
+{
+  namespace NFlags
+  {
+    const Byte kIsText = 1 << 0;
+    const Byte kCrc = 1 << 1;
+    const Byte kExtra = 1 << 2;
+    const Byte kName = 1 << 3;
+    const Byte kComment = 1 << 4;
+  }
+  
+  namespace NExtraFlags
+  {
+    const Byte kMaximum = 2;
+    const Byte kFastest = 4;
+  }
+  
+  namespace NCompressionMethod
+  {
+    const Byte kDeflate = 8;
+  }
+
+  namespace NHostOS
+  {
+    enum EEnum
+    {
+      kFAT = 0,
+      kAMIGA,
+      kVMS,
+      kUnix,
+      kVM_CMS,
+      kAtari,
+      kHPFS,
+      kMac,
+      kZ_System,
+      kCPM,
+      kTOPS20,
+      kNTFS,
+      kQDOS,
+      kAcorn,
+      kVFAT,
+      kMVS,
+      kBeOS,
+      kTandem,
+      
+      kUnknown = 255
+    };
+  }
+}
+
+static const char *kHostOSes[] =
+{
+  "FAT",
+  "AMIGA",
+  "VMS",
+  "Unix",
+  "VM/CMS",
+  "Atari",
+  "HPFS",
+  "Macintosh",
+  "Z-System",
+  "CP/M",
+  "TOPS-20",
+  "NTFS",
+  "SMS/QDOS",
+  "Acorn",
+  "VFAT",
+  "MVS",
+  "BeOS",
+  "Tandem",
+  "OS/400",
+  "OS/X"
+};
+
+static const char *kUnknownOS = "Unknown";
+
+class CItem
+{
+  bool TestFlag(Byte flag) const { return (Flags & flag) != 0; }
+public:
+  Byte Method;
+  Byte Flags;
+  Byte ExtraFlags;
+  Byte HostOS;
+  UInt32 Time;
+  UInt32 Crc;
+  UInt32 Size32;
+
+  AString Name;
+  AString Comment;
+  // CByteBuffer Extra;
+
+  // bool IsText() const { return TestFlag(NHeader::NFlags::kIsText); }
+  bool HeaderCrcIsPresent() const { return TestFlag(NHeader::NFlags::kCrc); }
+  bool ExtraFieldIsPresent() const { return TestFlag(NHeader::NFlags::kExtra); }
+  bool NameIsPresent() const { return TestFlag(NHeader::NFlags::kName); }
+  bool CommentIsPresent() const { return TestFlag(NHeader::NFlags::kComment); }
+
+  void Clear()
+  {
+    Name.Empty();
+    Comment.Empty();
+    // Extra.SetCapacity(0);
+  }
+
+  HRESULT ReadHeader(NCompress::NDeflate::NDecoder::CCOMCoder *stream);
+  HRESULT ReadFooter1(NCompress::NDeflate::NDecoder::CCOMCoder *stream);
+  HRESULT ReadFooter2(ISequentialInStream *stream);
+
+  HRESULT WriteHeader(ISequentialOutStream *stream);
+  HRESULT WriteFooter(ISequentialOutStream *stream);
+};
+
+static HRESULT ReadBytes(NCompress::NDeflate::NDecoder::CCOMCoder *stream, Byte *data, UInt32 size)
+{
+  for (UInt32 i = 0; i < size; i++)
+    data[i] = stream->ReadByte();
+  return stream->InputEofError() ? S_FALSE : S_OK;
+}
+
+static HRESULT SkipBytes(NCompress::NDeflate::NDecoder::CCOMCoder *stream, UInt32 size)
+{
+  for (UInt32 i = 0; i < size; i++)
+    stream->ReadByte();
+  return stream->InputEofError() ? S_FALSE : S_OK;
+}
+
+static HRESULT ReadUInt16(NCompress::NDeflate::NDecoder::CCOMCoder *stream, UInt16 &value /* , UInt32 &crc */)
+{
+  value = 0;
+  for (int i = 0; i < 2; i++)
+  {
+    Byte b = stream->ReadByte();
+    if (stream->InputEofError())
+      return S_FALSE;
+    // crc = CRC_UPDATE_BYTE(crc, b);
+    value |= (UInt16(b) << (8 * i));
+  }
+  return S_OK;
+}
+
+static HRESULT ReadString(NCompress::NDeflate::NDecoder::CCOMCoder *stream, AString &s, UInt32 limit /* , UInt32 &crc */)
+{
+  s.Empty();
+  for (UInt32 i = 0; i < limit; i++)
+  {
+    Byte b = stream->ReadByte();
+    if (stream->InputEofError())
+      return S_FALSE;
+    // crc = CRC_UPDATE_BYTE(crc, b);
+    if (b == 0)
+      return S_OK;
+    s += (char)b;
+  }
+  return S_FALSE;
+}
+
+HRESULT CItem::ReadHeader(NCompress::NDeflate::NDecoder::CCOMCoder *stream)
+{
+  Clear();
+
+  // Header-CRC field had another meaning in old version of gzip!
+  // UInt32 crc = CRC_INIT_VAL;
+  Byte buf[10];
+
+  RINOK(ReadBytes(stream, buf, 10));
+  
+  if (GetUi16(buf) != kSignature)
+    return S_FALSE;
+
+  Method = buf[2];
+
+  if (Method != NHeader::NCompressionMethod::kDeflate)
+    return S_FALSE;
+
+  Flags = buf[3];
+  Time = Get32(buf + 4);
+  ExtraFlags = buf[8];
+  HostOS = buf[9];
+
+  // crc = CrcUpdate(crc, buf, 10);
+  
+  if (ExtraFieldIsPresent())
+  {
+    UInt16 extraSize;
+    RINOK(ReadUInt16(stream, extraSize /* , crc */));
+    RINOK(SkipBytes(stream, extraSize));
+    // Extra.SetCapacity(extraSize);
+    // RINOK(ReadStream_FALSE(stream, Extra, extraSize));
+    // crc = CrcUpdate(crc, Extra, extraSize);
+  }
+  if (NameIsPresent())
+    RINOK(ReadString(stream, Name, (1 << 10) /* , crc */));
+  if (CommentIsPresent())
+    RINOK(ReadString(stream, Comment, (1 << 16) /* , crc */));
+
+  if (HeaderCrcIsPresent())
+  {
+    UInt16 headerCRC;
+    // UInt32 dummy = 0;
+    RINOK(ReadUInt16(stream, headerCRC /* , dummy */));
+    /*
+    if ((UInt16)CRC_GET_DIGEST(crc) != headerCRC)
+      return S_FALSE;
+    */
+  }
+  return stream->InputEofError() ? S_FALSE : S_OK;
+}
+
+HRESULT CItem::ReadFooter1(NCompress::NDeflate::NDecoder::CCOMCoder *stream)
+{
+  Byte buf[8];
+  RINOK(ReadBytes(stream, buf, 8));
+  Crc = Get32(buf);
+  Size32 = Get32(buf + 4);
+  return stream->InputEofError() ? S_FALSE : S_OK;
+}
+
+HRESULT CItem::ReadFooter2(ISequentialInStream *stream)
+{
+  Byte buf[8];
+  RINOK(ReadStream_FALSE(stream, buf, 8));
+  Crc = Get32(buf);
+  Size32 = Get32(buf + 4);
+  return S_OK;
+}
+
+HRESULT CItem::WriteHeader(ISequentialOutStream *stream)
+{
+  Byte buf[10];
+  SetUi16(buf, kSignature);
+  buf[2] = Method;
+  buf[3] = Flags & NHeader::NFlags::kName;
+  // buf[3] |= NHeader::NFlags::kCrc;
+  SetUi32(buf + 4, Time);
+  buf[8] = ExtraFlags;
+  buf[9] = HostOS;
+  RINOK(WriteStream(stream, buf, 10));
+  // crc = CrcUpdate(CRC_INIT_VAL, buf, 10);
+  if (NameIsPresent())
+  {
+    // crc = CrcUpdate(crc, (const char *)Name, Name.Length() + 1);
+    RINOK(WriteStream(stream, (const char *)Name, Name.Length() + 1));
+  }
+  // SetUi16(buf, (UInt16)CRC_GET_DIGEST(crc));
+  // RINOK(WriteStream(stream, buf, 2));
+  return S_OK;
+}
+
+HRESULT CItem::WriteFooter(ISequentialOutStream *stream)
+{
+  Byte buf[8];
+  SetUi32(buf, Crc);
+  SetUi32(buf + 4, Size32);
+  return WriteStream(stream, buf, 8);
+}
+
+static const UInt32 kAlgoX1 = 0;
+static const UInt32 kAlgoX5 = 1;
+
+static const UInt32 kNumPassesX1  = 1;
+static const UInt32 kNumPassesX7  = 3;
+static const UInt32 kNumPassesX9  = 10;
+
+static const UInt32 kNumFastBytesX1 = 32;
+static const UInt32 kNumFastBytesX7 = 64;
+static const UInt32 kNumFastBytesX9 = 128;
+
+struct CCompressMode
+{
+  UInt32 NumPasses;
+  UInt32 NumFastBytes;
+  UInt32 Algo;
+  UInt32 Mc;
+  bool McDefined;
+
+  bool IsMaximum() const { return Algo > 0; }
+
+  void Init()
+  {
+    NumPasses = NumFastBytes = Mc = Algo = 0xFFFFFFFF;
+    McDefined = false;
+  }
+ 
+  void Normalize(UInt32 level)
+  {
+    if (level == 0xFFFFFFFF)
+      level = 5;
+    if (NumPasses == 0xFFFFFFFF)
+      NumPasses =
+        (level >= 9 ? kNumPassesX9 :
+        (level >= 7 ? kNumPassesX7 :
+                      kNumPassesX1));
+    if (NumFastBytes == 0xFFFFFFFF)
+      NumFastBytes =
+        (level >= 9 ? kNumFastBytesX9 :
+        (level >= 7 ? kNumFastBytesX7 :
+                      kNumFastBytesX1));
+    if (Algo == 0xFFFFFFFF)
+      Algo = (level >= 5 ?
+        kAlgoX5 :
+        kAlgoX1);
+  }
+};
+
+class CHandler:
+  public IInArchive,
+  public IArchiveOpenSeq,
+  public IOutArchive,
+  public ISetProperties,
+  public CMyUnknownImp
+{
+  CItem _item;
+  UInt64 _startPosition;
+  UInt64 _headerSize;
+  UInt64 _packSize;
+  bool _packSizeDefined;
+  CMyComPtr<IInStream> _stream;
+  CMyComPtr<ICompressCoder> _decoder;
+  NCompress::NDeflate::NDecoder::CCOMCoder *_decoderSpec;
+
+  CCompressMode _method;
+  UInt32 _level;
+
+  void InitMethodProperties()
+  {
+    _level = 0xFFFFFFFF;
+    _method.Init();
+  }
+
+public:
+  MY_UNKNOWN_IMP4(IInArchive, IArchiveOpenSeq, IOutArchive, ISetProperties)
+  INTERFACE_IInArchive(;)
+  INTERFACE_IOutArchive(;)
+  STDMETHOD(OpenSeq)(ISequentialInStream *stream);
+  STDMETHOD(SetProperties)(const wchar_t **names, const PROPVARIANT *values, Int32 numProps);
+
+  CHandler()
+  {
+    InitMethodProperties();
+    _decoderSpec = new NCompress::NDeflate::NDecoder::CCOMCoder;
+    _decoder = _decoderSpec;
+  }
+};
+
+STATPROPSTG kProps[] =
+{
+  { NULL, kpidPath, VT_BSTR},
+  { NULL, kpidSize, VT_UI8},
+  { NULL, kpidPackSize, VT_UI8},
+  { NULL, kpidMTime, VT_FILETIME},
+  { NULL, kpidHostOS, VT_BSTR},
+  { NULL, kpidCRC, VT_UI4}
+  // { NULL, kpidComment, VT_BSTR}
+}
+;
+
+IMP_IInArchive_Props
+IMP_IInArchive_ArcProps_NO_Table
+
+STDMETHODIMP CHandler::GetArchiveProperty(PROPID propID, PROPVARIANT *value)
+{
+  NCOM::CPropVariant prop;
+  switch(propID)
+  {
+    case kpidPhySize: if (_packSizeDefined) prop = _packSize; break;
+  }
+  prop.Detach(value);
+  return S_OK;
+}
+
+
+STDMETHODIMP CHandler::GetNumberOfItems(UInt32 *numItems)
+{
+  *numItems = 1;
+  return S_OK;
+}
+
+STDMETHODIMP CHandler::GetProperty(UInt32 /* index */, PROPID propID,  PROPVARIANT *value)
+{
+  COM_TRY_BEGIN
+  NWindows::NCOM::CPropVariant prop;
+  switch(propID)
+  {
+    case kpidPath:
+      if (_item.NameIsPresent())
+        prop = MultiByteToUnicodeString(_item.Name, CP_ACP);
+      break;
+    // case kpidComment: if (_item.CommentIsPresent()) prop = MultiByteToUnicodeString(_item.Comment, CP_ACP); break;
+    case kpidMTime:
+    {
+      if (_item.Time != 0)
+      {
+        FILETIME utc;
+        NTime::UnixTimeToFileTime(_item.Time, utc);
+        prop = utc;
+      }
+      break;
+    }
+    case kpidSize: if (_stream) prop = (UInt64)_item.Size32; break;
+    case kpidPackSize: if (_packSizeDefined) prop = _packSize; break;
+    case kpidHostOS: prop = (_item.HostOS < sizeof(kHostOSes) / sizeof(kHostOSes[0])) ?
+          kHostOSes[_item.HostOS] : kUnknownOS; break;
+    case kpidCRC: if (_stream) prop = _item.Crc; break;
+  }
+  prop.Detach(value);
+  return S_OK;
+  COM_TRY_END
+}
+
+STDMETHODIMP CHandler::Open(IInStream *stream, const UInt64 *, IArchiveOpenCallback *)
+{
+  COM_TRY_BEGIN
+  HRESULT res;
+  try
+  {
+    RINOK(stream->Seek(0, STREAM_SEEK_CUR, &_startPosition));
+    res = OpenSeq(stream);
+    if (res == S_OK)
+    {
+      UInt64 endPos;
+      res = stream->Seek(-8, STREAM_SEEK_END, &endPos);
+      _packSize = endPos + 8 - _startPosition;
+      _packSizeDefined = true;
+      if (res == S_OK)
+      {
+        res = _item.ReadFooter2(stream);
+        _stream = stream;
+      }
+    }
+  }
+  catch(...) { res = S_FALSE; }
+  if (res != S_OK)
+    Close();
+  return res;
+  COM_TRY_END
+}
+
+STDMETHODIMP CHandler::OpenSeq(ISequentialInStream *stream)
+{
+  COM_TRY_BEGIN
+  HRESULT res;
+  try
+  {
+    Close();
+    _decoderSpec->SetInStream(stream);
+    _decoderSpec->InitInStream(true);
+    res = _item.ReadHeader(_decoderSpec);
+    _headerSize = _decoderSpec->GetInputProcessedSize();
+  }
+  catch(...) { res = S_FALSE; }
+  if (res != S_OK)
+    Close();
+  return res;
+  COM_TRY_END
+}
+
+STDMETHODIMP CHandler::Close()
+{
+  _packSizeDefined = false;
+  _stream.Release();
+  _decoderSpec->ReleaseInStream();
+  return S_OK;
+}
+
+STDMETHODIMP CHandler::Extract(const UInt32* indices, UInt32 numItems,
+    Int32 _aTestMode, IArchiveExtractCallback *extractCallback)
+{
+  COM_TRY_BEGIN
+  bool allFilesMode = (numItems == (UInt32)-1);
+  if (!allFilesMode)
+  {
+    if (numItems == 0)
+      return S_OK;
+    if (numItems != 1 || indices[0] != 0)
+      return E_INVALIDARG;
+  }
+
+  bool testMode = (_aTestMode != 0);
+  if (_stream)
+    extractCallback->SetTotal(_packSize);
+  UInt64 currentTotalPacked = 0;
+  RINOK(extractCallback->SetCompleted(&currentTotalPacked));
+  CMyComPtr<ISequentialOutStream> realOutStream;
+  Int32 askMode = testMode ?
+      NArchive::NExtract::NAskMode::kTest :
+      NArchive::NExtract::NAskMode::kExtract;
+  RINOK(extractCallback->GetStream(0, &realOutStream, askMode));
+  if (!testMode && !realOutStream)
+    return S_OK;
+
+  extractCallback->PrepareOperation(askMode);
+
+  COutStreamWithCRC *outStreamSpec = new COutStreamWithCRC;
+  CMyComPtr<ISequentialOutStream> outStream(outStreamSpec);
+  outStreamSpec->SetStream(realOutStream);
+  outStreamSpec->Init();
+  realOutStream.Release();
+
+  CLocalProgress *lps = new CLocalProgress;
+  CMyComPtr<ICompressProgressInfo> progress = lps;
+  lps->Init(extractCallback, true);
+
+  if (_stream)
+  {
+    RINOK(_stream->Seek(_startPosition, STREAM_SEEK_SET, NULL));
+    _decoderSpec->InitInStream(true);
+  }
+  bool firstItem = true;
+  Int32 opRes;
+  for (;;)
+  {
+    lps->InSize = _packSize = _decoderSpec->GetInputProcessedSize();
+    _packSizeDefined = true;
+    lps->OutSize = outStreamSpec->GetSize();
+    RINOK(lps->SetCur());
+
+    CItem item;
+    if (!firstItem || _stream)
+    {
+      HRESULT result = item.ReadHeader(_decoderSpec);
+      if (result != S_OK)
+      {
+        if (result != S_FALSE)
+          return result;
+        opRes = firstItem ?
+            NArchive::NExtract::NOperationResult::kDataError :
+            NArchive::NExtract::NOperationResult::kOK;
+        break;
+      }
+    }
+    firstItem = false;
+
+    UInt64 startOffset = outStreamSpec->GetSize();
+    outStreamSpec->InitCRC();
+
+    HRESULT result = _decoderSpec->CodeResume(outStream, NULL, progress);
+    if (result != S_OK)
+    {
+      if (result != S_FALSE)
+        return result;
+      opRes = NArchive::NExtract::NOperationResult::kDataError;
+      break;
+    }
+
+    _decoderSpec->AlignToByte();
+    if (item.ReadFooter1(_decoderSpec) != S_OK)
+    {
+      opRes = NArchive::NExtract::NOperationResult::kDataError;
+      break;
+    }
+    if (item.Crc != outStreamSpec->GetCRC() ||
+        item.Size32 != (UInt32)(outStreamSpec->GetSize() - startOffset))
+    {
+      opRes = NArchive::NExtract::NOperationResult::kCRCError;
+      break;
+    }
+  }
+  outStream.Release();
+  return extractCallback->SetOperationResult(opRes);
+  COM_TRY_END
+}
+
+static const Byte kHostOS =
+  #ifdef _WIN32
+  NHeader::NHostOS::kFAT;
+  #else
+  NHeader::NHostOS::kUnix;
+  #endif
+
+static HRESULT UpdateArchive(
+    ISequentialOutStream *outStream,
+    UInt64 unpackSize,
+    const CItem &newItem,
+    const CCompressMode &compressionMode,
+    IArchiveUpdateCallback *updateCallback)
+{
+  UInt64 complexity = 0;
+  RINOK(updateCallback->SetTotal(unpackSize));
+  RINOK(updateCallback->SetCompleted(&complexity));
+
+  CMyComPtr<ISequentialInStream> fileInStream;
+
+  RINOK(updateCallback->GetStream(0, &fileInStream));
+
+  CSequentialInStreamWithCRC *inStreamSpec = new CSequentialInStreamWithCRC;
+  CMyComPtr<ISequentialInStream> crcStream(inStreamSpec);
+  inStreamSpec->SetStream(fileInStream);
+  inStreamSpec->Init();
+
+  CLocalProgress *lps = new CLocalProgress;
+  CMyComPtr<ICompressProgressInfo> progress = lps;
+  lps->Init(updateCallback, true);
+  
+  CItem item = newItem;
+  item.Method = NHeader::NCompressionMethod::kDeflate;
+  item.ExtraFlags = compressionMode.IsMaximum() ?
+      NHeader::NExtraFlags::kMaximum :
+      NHeader::NExtraFlags::kFastest;
+
+  item.HostOS = kHostOS;
+
+  RINOK(item.WriteHeader(outStream));
+
+  NCompress::NDeflate::NEncoder::CCOMCoder *deflateEncoderSpec = new NCompress::NDeflate::NEncoder::CCOMCoder;
+  CMyComPtr<ICompressCoder> deflateEncoder = deflateEncoderSpec;
+  {
+    NWindows::NCOM::CPropVariant props[] =
+    {
+      compressionMode.Algo,
+      compressionMode.NumPasses,
+      compressionMode.NumFastBytes,
+      compressionMode.Mc
+    };
+    PROPID propIDs[] =
+    {
+      NCoderPropID::kAlgorithm,
+      NCoderPropID::kNumPasses,
+      NCoderPropID::kNumFastBytes,
+      NCoderPropID::kMatchFinderCycles
+    };
+    int numProps = sizeof(propIDs) / sizeof(propIDs[0]);
+    if (!compressionMode.McDefined)
+      numProps--;
+    RINOK(deflateEncoderSpec->SetCoderProperties(propIDs, props, numProps));
+  }
+  RINOK(deflateEncoder->Code(crcStream, outStream, NULL, NULL, progress));
+
+  item.Crc = inStreamSpec->GetCRC();
+  item.Size32 = (UInt32)inStreamSpec->GetSize();
+  RINOK(item.WriteFooter(outStream));
+  return updateCallback->SetOperationResult(NArchive::NUpdate::NOperationResult::kOK);
+}
+
+STDMETHODIMP CHandler::GetFileTimeType(UInt32 *timeType)
+{
+  *timeType = NFileTimeType::kUnix;
+  return S_OK;
+}
+
+STDMETHODIMP CHandler::UpdateItems(ISequentialOutStream *outStream, UInt32 numItems,
+    IArchiveUpdateCallback *updateCallback)
+{
+  if (numItems != 1)
+    return E_INVALIDARG;
+
+  Int32 newData, newProps;
+  UInt32 indexInArchive;
+  if (!updateCallback)
+    return E_FAIL;
+  RINOK(updateCallback->GetUpdateItemInfo(0, &newData, &newProps, &indexInArchive));
+
+  CItem newItem = _item;
+  newItem.ExtraFlags = 0;
+  newItem.Flags = 0;
+  if (IntToBool(newProps))
+  {
+    {
+      FILETIME utcTime;
+      NCOM::CPropVariant prop;
+      RINOK(updateCallback->GetProperty(0, kpidMTime, &prop));
+      if (prop.vt != VT_FILETIME)
+        return E_INVALIDARG;
+      utcTime = prop.filetime;
+      if (!NTime::FileTimeToUnixTime(utcTime, newItem.Time))
+        return E_INVALIDARG;
+    }
+    {
+      NCOM::CPropVariant prop;
+      RINOK(updateCallback->GetProperty(0, kpidPath, &prop));
+      if (prop.vt == VT_BSTR)
+      {
+        UString name = prop.bstrVal;
+        int dirDelimiterPos = name.ReverseFind(CHAR_PATH_SEPARATOR);
+        if (dirDelimiterPos >= 0)
+          name = name.Mid(dirDelimiterPos + 1);
+        newItem.Name = UnicodeStringToMultiByte(name, CP_ACP);
+        if (!newItem.Name.IsEmpty())
+          newItem.Flags |= NHeader::NFlags::kName;
+      }
+      else if (prop.vt != VT_EMPTY)
+        return E_INVALIDARG;
+    }
+    {
+      NCOM::CPropVariant prop;
+      RINOK(updateCallback->GetProperty(0, kpidIsDir, &prop));
+      if (prop.vt == VT_BOOL)
+      {
+        if (prop.boolVal != VARIANT_FALSE)
+          return E_INVALIDARG;
+      }
+      else if (prop.vt != VT_EMPTY)
+        return E_INVALIDARG;
+    }
+  }
+
+  if (IntToBool(newData))
+  {
+    UInt64 size;
+    {
+      NCOM::CPropVariant prop;
+      RINOK(updateCallback->GetProperty(0, kpidSize, &prop));
+      if (prop.vt != VT_UI8)
+        return E_INVALIDARG;
+      size = prop.uhVal.QuadPart;
+    }
+
+    _method.Normalize(_level);
+    return UpdateArchive(outStream, size, newItem, _method, updateCallback);
+  }
+    
+  if (indexInArchive != 0)
+    return E_INVALIDARG;
+
+  if (!_stream)
+    return E_NOTIMPL;
+
+  UInt64 offset = _startPosition;
+  if (IntToBool(newProps))
+  {
+    newItem.WriteHeader(outStream);
+    offset += _headerSize;
+  }
+  RINOK(_stream->Seek(offset, STREAM_SEEK_SET, NULL));
+  return NCompress::CopyStream(_stream, outStream, NULL);
+}
+
+STDMETHODIMP CHandler::SetProperties(const wchar_t **names, const PROPVARIANT *values, Int32 numProps)
+{
+  InitMethodProperties();
+  for (int i = 0; i < numProps; i++)
+  {
+    UString name = names[i];
+    name.MakeUpper();
+    if (name.IsEmpty())
+      return E_INVALIDARG;
+    const PROPVARIANT &prop = values[i];
+    if (name[0] == L'X')
+    {
+      UInt32 level = 9;
+      RINOK(ParsePropValue(name.Mid(1), prop, level));
+      _level = level;
+    }
+    else if (name.Left(4) == L"PASS")
+    {
+      UInt32 num = kNumPassesX9;
+      RINOK(ParsePropValue(name.Mid(4), prop, num));
+      _method.NumPasses = num;
+    }
+    else if (name.Left(2) == L"FB")
+    {
+      UInt32 num = kNumFastBytesX9;
+      RINOK(ParsePropValue(name.Mid(2), prop, num));
+      _method.NumFastBytes = num;
+    }
+    else if (name.Left(2) == L"MC")
+    {
+      UInt32 num = 0xFFFFFFFF;
+      RINOK(ParsePropValue(name.Mid(2), prop, num));
+      _method.Mc = num;
+      _method.McDefined = true;
+    }
+    else if (name.Left(1) == L"A")
+    {
+      UInt32 num = kAlgoX5;
+      RINOK(ParsePropValue(name.Mid(1), prop, num));
+      _method.Algo = num;
+    }
+    else
+      return E_INVALIDARG;
+  }
+  return S_OK;
+}
+
+static IInArchive *CreateArc() { return new CHandler; }
+#ifndef EXTRACT_ONLY
+static IOutArchive *CreateArcOut() { return new CHandler; }
+#else
+#define CreateArcOut 0
+#endif
+
+static CArcInfo g_ArcInfo =
+  { L"GZip", L"gz gzip tgz tpz", L"* * .tar .tar", 0xEF, { 0x1F, 0x8B, 8 }, 3, true, CreateArc, CreateArcOut };
+
+REGISTER_ARC(GZip)
+
+}}