nsishandler.cpp

7-Zip 是一款号称有着现今最高压缩比的压缩软件

// NSisHandler.cpp

#include "StdAfx.h"

#include "NsisHandler.h"

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

#include "Windows/PropVariant.h"

#include "../Common/ItemNameUtils.h"
#include "../../Common/StreamUtils.h"

#include "../../../../C/CpuArch.h"

#define Get32(p) GetUi32(p)

using namespace NWindows;

namespace NArchive {
namespace NNsis {

static const wchar_t *kBcjMethod = L"BCJ";
static const wchar_t *kUnknownMethod = L"Unknown";

static const wchar_t *kMethods[] =
{
  L"Copy",
  L"Deflate",
  L"BZip2",
  L"LZMA"
};

static const int kNumMethods = sizeof(kMethods) / sizeof(kMethods[0]);

STATPROPSTG kProps[] =
{
  { NULL, kpidPath, VT_BSTR},
  { NULL, kpidSize, VT_UI8},
  { NULL, kpidPackSize, VT_UI8},
  { NULL, kpidMTime, VT_FILETIME},
  { NULL, kpidMethod, VT_BSTR},
  { NULL, kpidSolid, VT_BOOL}
};

STATPROPSTG kArcProps[] =
{
  { NULL, kpidMethod, VT_BSTR},
  { NULL, kpidSolid, VT_BOOL}
};

IMP_IInArchive_Props
IMP_IInArchive_ArcProps

STDMETHODIMP CHandler::GetArchiveProperty(PROPID propID, PROPVARIANT *value)
{
  COM_TRY_BEGIN
  NWindows::NCOM::CPropVariant prop;
  switch(propID)
  {
    case kpidMethod:
    {
      UInt32 dict = 1;
      bool filter = false;
      for (int i = 0; i < _archive.Items.Size(); i++)
      {
        const CItem &item = _archive.Items[i];
        filter |= item.UseFilter;
        if (item.DictionarySize > dict)
          dict = item.DictionarySize;
      }
      prop = GetMethod(filter, dict);
      break;
    }
    case kpidSolid: prop = _archive.IsSolid; break;
  }
  prop.Detach(value);
  return S_OK;
  COM_TRY_END
}


STDMETHODIMP CHandler::Open(IInStream *stream, const UInt64 * maxCheckStartPosition, IArchiveOpenCallback * /* openArchiveCallback */)
{
  COM_TRY_BEGIN
  Close();
  {
    if(_archive.Open(
        EXTERNAL_CODECS_VARS
        stream, maxCheckStartPosition) != S_OK)
      return S_FALSE;
    _inStream = stream;
  }
  return S_OK;
  COM_TRY_END
}

STDMETHODIMP CHandler::Close()
{
  _archive.Clear();
  _archive.Release();
  _inStream.Release();
  return S_OK;
}

STDMETHODIMP CHandler::GetNumberOfItems(UInt32 *numItems)
{
  *numItems = _archive.Items.Size()
  #ifdef NSIS_SCRIPT
    + 1
  #endif
  ;
  return S_OK;
}

static UString ConvertUInt32ToString(UInt32 value)
{
  wchar_t buffer[32];
  ConvertUInt64ToString(value, buffer);
  return buffer;
}

static UString GetStringForSizeValue(UInt32 value)
{
  for (int i = 31; i >= 0; i--)
    if ((UInt32(1) << i) == value)
      return ConvertUInt32ToString(i);
  UString result;
  if (value % (1 << 20) == 0)
  {
    result += ConvertUInt32ToString(value >> 20);
    result += L"m";
  }
  else if (value % (1 << 10) == 0)
  {
    result += ConvertUInt32ToString(value >> 10);
    result += L"k";
  }
  else
  {
    result += ConvertUInt32ToString(value);
    result += L"b";
  }
  return result;
}

UString CHandler::GetMethod(bool useItemFilter, UInt32 dictionary) const
{
  NMethodType::EEnum methodIndex = _archive.Method;
  UString method;
  if (_archive.IsSolid && _archive.UseFilter || !_archive.IsSolid && useItemFilter)
  {
    method += kBcjMethod;
    method += L" ";
  }
  method += (methodIndex < kNumMethods) ? kMethods[methodIndex] : kUnknownMethod;
  if (methodIndex == NMethodType::kLZMA)
  {
    method += L":";
    method += GetStringForSizeValue(_archive.IsSolid ? _archive.DictionarySize: dictionary);
  }
  return method;
}

bool CHandler::GetUncompressedSize(int index, UInt32 &size)
{
  size = 0;
  const CItem &item = _archive.Items[index];
  if (item.SizeIsDefined)
     size = item.Size;
  else if (_archive.IsSolid && item.EstimatedSizeIsDefined)
     size  = item.EstimatedSize;
  else
    return false;
  return true;
}

bool CHandler::GetCompressedSize(int index, UInt32 &size)
{
  size = 0;
  const CItem &item = _archive.Items[index];
  if (item.CompressedSizeIsDefined)
    size = item.CompressedSize;
  else
  {
    if (_archive.IsSolid)
    {
      if (index == 0)
        size = _archive.FirstHeader.GetDataSize();
      else
        return false;
    }
    else
    {
      if (!item.IsCompressed)
        size = item.Size;
      else
        return false;
    }
  }
  return true;
}


STDMETHODIMP CHandler::GetProperty(UInt32 index, PROPID propID, PROPVARIANT *value)
{
  COM_TRY_BEGIN
  NWindows::NCOM::CPropVariant prop;
  #ifdef NSIS_SCRIPT
  if (index >= (UInt32)_archive.Items.Size())
  {
    switch(propID)
    {
      case kpidPath:  prop = L"[NSIS].nsi"; break;
      case kpidSize:
      case kpidPackSize:  prop = (UInt64)_archive.Script.Length(); break;
      case kpidSolid:  prop = false; break;
    }
  }
  else
  #endif
  {
    const CItem &item = _archive.Items[index];
    switch(propID)
    {
      case kpidPath:
      {
        UString s;
        if (_archive.IsUnicode)
          s = item.GetReducedNameU();
        else
          s = MultiByteToUnicodeString(item.GetReducedNameA(), CP_ACP);
        s = NItemName::WinNameToOSName(s);
        if (!s.IsEmpty())
          prop = (const wchar_t *)s;
        break;
      }
      case kpidSize:
      {
        UInt32 size;
        if (GetUncompressedSize(index, size))
          prop = (UInt64)size;
        break;
      }
      case kpidPackSize:
      {
        UInt32 size;
        if (GetCompressedSize(index, size))
          prop = (UInt64)size;
        break;
      }
      case kpidMTime:
      {
        if (item.MTime.dwHighDateTime > 0x01000000 &&
            item.MTime.dwHighDateTime < 0xFF000000)
          prop = item.MTime;
        break;
      }
      case kpidMethod:  prop = GetMethod(item.UseFilter, item.DictionarySize); break;
      case kpidSolid:  prop = _archive.IsSolid; break;
    }
  }
  prop.Detach(value);
  return S_OK;
  COM_TRY_END
}

STDMETHODIMP CHandler::Extract(const UInt32* indices, UInt32 numItems,
    Int32 _aTestMode, IArchiveExtractCallback *extractCallback)
{
  COM_TRY_BEGIN
  bool testMode = (_aTestMode != 0);
  bool allFilesMode = (numItems == UInt32(-1));
  if (allFilesMode)
    GetNumberOfItems(&numItems);
  if(numItems == 0)
    return S_OK;
  UInt64 totalSize = 0;

  UInt32 i;
  for(i = 0; i < numItems; i++)
  {
    UInt32 index = (allFilesMode ? i : indices[i]);
    #ifdef NSIS_SCRIPT
    if (index >= (UInt32)_archive.Items.Size())
      totalSize += _archive.Script.Length();
    else
    #endif
    {
      UInt32 size;
      if (_archive.IsSolid)
      {
        GetUncompressedSize(index, size);
        UInt64 pos = _archive.GetPosOfSolidItem(index);
        if (pos > totalSize)
          totalSize = pos + size;
      }
      else
      {
        GetCompressedSize(index, size);
        totalSize += size;
      }
    }
  }
  extractCallback->SetTotal(totalSize);

  UInt64 currentTotalSize = 0;
  UInt32 currentItemSize = 0;

  UInt64 streamPos = 0;
  if (_archive.IsSolid)
  {
    RINOK(_inStream->Seek(_archive.StreamOffset, STREAM_SEEK_SET, NULL));
    bool useFilter;
    RINOK(_archive.Decoder.Init(
        EXTERNAL_CODECS_VARS
        _inStream, _archive.Method, _archive.FilterFlag, useFilter));
  }

  bool dataError = false;
  for (i = 0; i < numItems; i++, currentTotalSize += currentItemSize)
  {
    currentItemSize = 0;
    RINOK(extractCallback->SetCompleted(&currentTotalSize));
    CMyComPtr<ISequentialOutStream> realOutStream;
    Int32 askMode;
    askMode = testMode ? NArchive::NExtract::NAskMode::kTest : NArchive::NExtract::NAskMode::kExtract;
    UInt32 index = allFilesMode ? i : indices[i];

    RINOK(extractCallback->GetStream(index, &realOutStream, askMode));

    #ifdef NSIS_SCRIPT
    if (index >= (UInt32)_archive.Items.Size())
    {
      currentItemSize = _archive.Script.Length();
      if(!testMode && (!realOutStream))
        continue;
      RINOK(extractCallback->PrepareOperation(askMode));
      if (!testMode)
        RINOK(WriteStream(realOutStream, (const char *)_archive.Script, (UInt32)_archive.Script.Length()));
    }
    else
    #endif
    {
      const CItem &item = _archive.Items[index];
      
      if (_archive.IsSolid)
        GetUncompressedSize(index, currentItemSize);
      else
        GetCompressedSize(index, currentItemSize);
      
      if(!testMode && (!realOutStream))
        continue;
      
      RINOK(extractCallback->PrepareOperation(askMode));
      
      if (!dataError)
      {
        bool needDecompress = false;
        bool sizeIsKnown = false;
        UInt32 fullSize = 0;

        const UInt32 kBufferLength = 1 << 11;
        Byte buffer[kBufferLength];
        
        if (_archive.IsSolid)
        {
          UInt64 pos = _archive.GetPosOfSolidItem(index);
          while(streamPos < pos)
          {
            size_t processedSize = (UInt32)MyMin(pos - streamPos, (UInt64)kBufferLength);
            HRESULT res = _archive.Decoder.Read(buffer, &processedSize);
            if (res != S_OK)
            {
              if (res != S_FALSE)
                return res;
              dataError = true;
              break;
            }
            if (processedSize == 0)
            {
              dataError = true;
              break;
            }
            streamPos += processedSize;
          }
          if (streamPos == pos)
          {
            size_t processedSize = 4;
            RINOK(_archive.Decoder.Read(buffer, &processedSize));
            if (processedSize != 4)
              return E_FAIL;
            streamPos += processedSize;
            fullSize = Get32(buffer);
            sizeIsKnown = true;
            needDecompress = true;
          }
        }
        else
        {
          RINOK(_inStream->Seek(_archive.GetPosOfNonSolidItem(index) + 4, STREAM_SEEK_SET, NULL));
          if (item.IsCompressed)
          {
            needDecompress = true;
            bool useFilter;
            RINOK(_archive.Decoder.Init(
                EXTERNAL_CODECS_VARS
                _inStream, _archive.Method, _archive.FilterFlag, useFilter));
            fullSize = Get32(buffer);
          }
          else
            fullSize = item.Size;
        }
        if (!dataError)
        {
          if (needDecompress)
          {
            UInt64 offset = 0;
            while(!sizeIsKnown || fullSize > 0)
            {
              UInt32 curSize = kBufferLength;
              if (sizeIsKnown && curSize > fullSize)
                curSize = fullSize;
              size_t processedSize = curSize;
              HRESULT res = _archive.Decoder.Read(buffer, &processedSize);
              if (res != S_OK)
              {
                if (res != S_FALSE)
                  return res;
                dataError = true;
                break;
              }
              if (processedSize == 0)
              {
                if (sizeIsKnown)
                  dataError = true;
                break;
              }
              
              fullSize -= (UInt32)processedSize;
              streamPos += processedSize;
              offset += processedSize;
              
              UInt64 completed;
              if (_archive.IsSolid)
                completed = currentTotalSize + offset;
              else
                completed = streamPos;
              RINOK(extractCallback->SetCompleted(&completed));
              if (!testMode)
                RINOK(WriteStream(realOutStream, buffer, processedSize));
            }
          }
          else
          {
            while(fullSize > 0)
            {
              UInt32 curSize = MyMin(fullSize, kBufferLength);
              UInt32 processedSize;
              RINOK(_inStream->Read(buffer, curSize, &processedSize));
              if (processedSize == 0)
              {
                dataError = true;
                break;
              }
              fullSize -= processedSize;
              streamPos += processedSize;
              if (!testMode)
                RINOK(WriteStream(realOutStream, buffer, processedSize));
            }
          }
        }
      }
    }
    realOutStream.Release();
    RINOK(extractCallback->SetOperationResult(dataError ?
        NArchive::NExtract::NOperationResult::kDataError :
        NArchive::NExtract::NOperationResult::kOK));
  }
  return S_OK;
  COM_TRY_END
}

IMPL_ISetCompressCodecsInfo

}}