zipaddcommon.cpp

7-Zip 是一款号称有着现今最高压缩比的压缩软件

// AddCommon.cpp

#include "StdAfx.h"

extern "C"
{
#include "../../../../C/7zCrc.h"
}

#include "Windows/PropVariant.h"
#include "Windows/Defs.h"
#include "../../ICoder.h"
#include "../../IPassword.h"
#include "../../Common/CreateCoder.h"
#include "../Common/InStreamWithCRC.h"

#include "ZipAddCommon.h"
#include "ZipHeader.h"

namespace NArchive {
namespace NZip {

static const CMethodId kMethodId_ZipBase   = 0x040100;
static const CMethodId kMethodId_BZip2     = 0x040202;

CAddCommon::CAddCommon(const CCompressionMethodMode &options):
  _options(options),
  _copyCoderSpec(NULL),
  _cryptoStreamSpec(0)
 {}

static HRESULT GetStreamCRC(ISequentialInStream *inStream, UInt32 &resultCRC)
{
  UInt32 crc = CRC_INIT_VAL;
  const UInt32 kBufferSize = (1 << 14);
  Byte buffer[kBufferSize];
  for (;;)
  {
    UInt32 realProcessedSize;
    RINOK(inStream->Read(buffer, kBufferSize, &realProcessedSize));
    if(realProcessedSize == 0)
    {
      resultCRC = CRC_GET_DIGEST(crc);
      return S_OK;
    }
    crc = CrcUpdate(crc, buffer, (size_t)realProcessedSize);
  }
}

HRESULT CAddCommon::Compress(
    DECL_EXTERNAL_CODECS_LOC_VARS
    ISequentialInStream *inStream, IOutStream *outStream,
    ICompressProgressInfo *progress, CCompressingResult &operationResult)
{
  CSequentialInStreamWithCRC *inSecCrcStreamSpec = 0;
  CInStreamWithCRC *inCrcStreamSpec = 0;
  CMyComPtr<ISequentialInStream> inCrcStream;
  {
    CMyComPtr<IInStream> inStream2;
    // we don't support stdin, since stream from stdin can require 64-bit size header
    RINOK(inStream->QueryInterface(IID_IInStream, (void **)&inStream2));
    if (inStream2)
    {
      inCrcStreamSpec = new CInStreamWithCRC;
      inCrcStream = inCrcStreamSpec;
      inCrcStreamSpec->SetStream(inStream2);
      inCrcStreamSpec->Init();
    }
    else
    {
      inSecCrcStreamSpec = new CSequentialInStreamWithCRC;
      inCrcStream = inSecCrcStreamSpec;
      inSecCrcStreamSpec->SetStream(inStream);
      inSecCrcStreamSpec->Init();
    }
  }

  int numTestMethods = _options.MethodSequence.Size();
  if (numTestMethods > 1 || _options.PasswordIsDefined)
  {
    if (inCrcStreamSpec == 0)
    {
      if (_options.PasswordIsDefined)
        return E_NOTIMPL;
      numTestMethods = 1;
    }
  }
  Byte method = 0;
  COutStreamReleaser outStreamReleaser;
  for(int i = 0; i < numTestMethods; i++)
  {
    if (inCrcStreamSpec != 0)
      RINOK(inCrcStreamSpec->Seek(0, STREAM_SEEK_SET, NULL));
    RINOK(outStream->Seek(0, STREAM_SEEK_SET, NULL));
    if (_options.PasswordIsDefined)
    {
      if (!_cryptoStream)
      {
        _cryptoStreamSpec = new CFilterCoder;
        _cryptoStream = _cryptoStreamSpec;
      }
      if (_options.IsAesMode)
      {
        _cryptoStreamSpec->Filter = _aesFilter = _filterAesSpec = new NCrypto::NWzAES::CEncoder;
        _filterAesSpec->SetKeyMode(_options.AesKeyMode);
        RINOK(_filterAesSpec->CryptoSetPassword(
            (const Byte *)(const char *)_options.Password, _options.Password.Length()));
        RINOK(_filterAesSpec->WriteHeader(outStream));
      }
      else
      {
        _cryptoStreamSpec->Filter = _zipCryptoFilter = _filterSpec = new NCrypto::NZip::CEncoder;
        RINOK(_filterSpec->CryptoSetPassword(
            (const Byte *)(const char *)_options.Password, _options.Password.Length()));
        UInt32 crc = 0;
        RINOK(GetStreamCRC(inStream, crc));
        RINOK(inCrcStreamSpec->Seek(0, STREAM_SEEK_SET, NULL));
        RINOK(_filterSpec->CryptoSetCRC(crc));
        RINOK(_filterSpec->WriteHeader(outStream));
      }
      RINOK(_cryptoStreamSpec->SetOutStream(outStream));
      outStreamReleaser.FilterCoder = _cryptoStreamSpec;
    }

    method = _options.MethodSequence[i];
    switch(method)
    {
      case NFileHeader::NCompressionMethod::kStored:
      {
        if(_copyCoderSpec == NULL)
        {
          _copyCoderSpec = new NCompress::CCopyCoder;
          _copyCoder = _copyCoderSpec;
        }
        CMyComPtr<ISequentialOutStream> outStreamNew;
        if (_options.PasswordIsDefined)
          outStreamNew = _cryptoStream;
        else
          outStreamNew = outStream;
        RINOK(_copyCoder->Code(inCrcStream, outStreamNew, NULL, NULL, progress));
        operationResult.ExtractVersion = NFileHeader::NCompressionMethod::kStoreExtractVersion;
        break;
      }
      default:
      {
        if(!_compressEncoder)
        {
          CMethodId methodId;
          switch(method)
          {
            case NFileHeader::NCompressionMethod::kBZip2:
              methodId = kMethodId_BZip2;
              break;
            default:
              methodId = kMethodId_ZipBase + method;
              break;
          }
          RINOK(CreateCoder(
              EXTERNAL_CODECS_LOC_VARS
              methodId, _compressEncoder, true));
          if (!_compressEncoder)
            return E_NOTIMPL;

          if (method == NFileHeader::NCompressionMethod::kDeflated ||
              method == NFileHeader::NCompressionMethod::kDeflated64)
          {
            NWindows::NCOM::CPropVariant properties[] =
            {
              _options.Algo,
              _options.NumPasses,
              _options.NumFastBytes,
              _options.NumMatchFinderCycles
            };
            PROPID propIDs[] =
            {
              NCoderPropID::kAlgorithm,
              NCoderPropID::kNumPasses,
              NCoderPropID::kNumFastBytes,
              NCoderPropID::kMatchFinderCycles
            };
            int numProps = sizeof(propIDs) / sizeof(propIDs[0]);
            if (!_options.NumMatchFinderCyclesDefined)
              numProps--;
            CMyComPtr<ICompressSetCoderProperties> setCoderProperties;
            _compressEncoder.QueryInterface(IID_ICompressSetCoderProperties, &setCoderProperties);
            if (setCoderProperties)
            {
              RINOK(setCoderProperties->SetCoderProperties(propIDs, properties, numProps));
            }
          }
          else if (method == NFileHeader::NCompressionMethod::kBZip2)
          {
            NWindows::NCOM::CPropVariant properties[] =
            {
              _options.DicSize,
              _options.NumPasses
              #ifdef COMPRESS_MT
              , _options.NumThreads
              #endif
            };
            PROPID propIDs[] =
            {
              NCoderPropID::kDictionarySize,
              NCoderPropID::kNumPasses
              #ifdef COMPRESS_MT
              , NCoderPropID::kNumThreads
              #endif
            };
            CMyComPtr<ICompressSetCoderProperties> setCoderProperties;
            _compressEncoder.QueryInterface(IID_ICompressSetCoderProperties, &setCoderProperties);
            if (setCoderProperties)
            {
              RINOK(setCoderProperties->SetCoderProperties(propIDs, properties, sizeof(propIDs) / sizeof(propIDs[0])));
            }
          }
        }
        CMyComPtr<ISequentialOutStream> outStreamNew;
        if (_options.PasswordIsDefined)
          outStreamNew = _cryptoStream;
        else
          outStreamNew = outStream;
        RINOK(_compressEncoder->Code(inCrcStream, outStreamNew, NULL, NULL, progress));
        operationResult.ExtractVersion = NFileHeader::NCompressionMethod::kDeflateExtractVersion;
        break;
      }
    }

    RINOK(outStream->Seek(0, STREAM_SEEK_CUR, &operationResult.PackSize));

    if (inCrcStreamSpec != 0)
    {
      operationResult.CRC = inCrcStreamSpec->GetCRC();
      operationResult.UnpackSize = inCrcStreamSpec->GetSize();
    }
    else
    {
      operationResult.CRC = inSecCrcStreamSpec->GetCRC();
      operationResult.UnpackSize = inSecCrcStreamSpec->GetSize();
    }

    if (_options.PasswordIsDefined)
    {
      if (operationResult.PackSize < operationResult.UnpackSize +
          (_options.IsAesMode ? _filterAesSpec->GetHeaderSize() : NCrypto::NZip::kHeaderSize))
        break;
    }
    else if (operationResult.PackSize < operationResult.UnpackSize)
      break;
  }
  if (_options.IsAesMode)
  {
    RINOK(_filterAesSpec->WriteFooter(outStream));
    RINOK(outStream->Seek(0, STREAM_SEEK_CUR, &operationResult.PackSize));
  }
  operationResult.Method = method;
  return outStream->SetSize(operationResult.PackSize);
}

}}