HRESULT CZipDecoder::Decode(
DECL_EXTERNAL_CODECS_LOC_VARS
CInArchive &archive, const CItemEx &item,
ISequentialOutStream *realOutStream,
IArchiveExtractCallback *extractCallback,
ICompressProgressInfo *compressProgress,
UInt32 numThreads, Int32 &res)
{
res = NArchive::NExtract::NOperationResult::kDataError;
CInStreamReleaser inStreamReleaser;
bool needCRC = true;
bool wzAesMode = false;
bool pkAesMode = false;
UInt16 methodId = item.CompressionMethod;
if (item.IsEncrypted())
{
if (item.IsStrongEncrypted())
{
CStrongCryptoField f;
if (item.CentralExtra.GetStrongCryptoField(f))
{
pkAesMode = true;
}
if (!pkAesMode)
{
res = NArchive::NExtract::NOperationResult::kUnSupportedMethod;
return S_OK;
}
}
if (methodId == NFileHeader::NCompressionMethod::kWzAES)
{
CWzAesExtraField aesField;
if (item.CentralExtra.GetWzAesField(aesField))
{
wzAesMode = true;
needCRC = aesField.NeedCrc();
}
}
}
COutStreamWithCRC *outStreamSpec = new COutStreamWithCRC;
CMyComPtr<ISequentialOutStream> outStream = outStreamSpec;
outStreamSpec->SetStream(realOutStream);
outStreamSpec->Init(needCRC);
UInt64 authenticationPos;
CMyComPtr<ISequentialInStream> inStream;
{
UInt64 packSize = item.PackSize;
if (wzAesMode)
{
if (packSize < NCrypto::NWzAes::kMacSize)
return S_OK;
packSize -= NCrypto::NWzAes::kMacSize;
}
UInt64 dataPos = item.GetDataPosition();
inStream.Attach(archive.CreateLimitedStream(dataPos, packSize));
authenticationPos = dataPos + packSize;
}
CMyComPtr<ICompressFilter> cryptoFilter;
if (item.IsEncrypted())
{
if (wzAesMode)
{
CWzAesExtraField aesField;
if (!item.CentralExtra.GetWzAesField(aesField))
return S_OK;
methodId = aesField.Method;
if (!_wzAesDecoder)
{
_wzAesDecoderSpec = new NCrypto::NWzAes::CDecoder;
_wzAesDecoder = _wzAesDecoderSpec;
}
cryptoFilter = _wzAesDecoder;
Byte properties = aesField.Strength;
RINOK(_wzAesDecoderSpec->SetDecoderProperties2(&properties, 1));
}
else if (pkAesMode)
{
if (!_pkAesDecoder)
{
_pkAesDecoderSpec = new NCrypto::NZipStrong::CDecoder;
_pkAesDecoder = _pkAesDecoderSpec;
}
cryptoFilter = _pkAesDecoder;
}
else
{
if (!_zipCryptoDecoder)
{
_zipCryptoDecoderSpec = new NCrypto::NZip::CDecoder;
_zipCryptoDecoder = _zipCryptoDecoderSpec;
}
cryptoFilter = _zipCryptoDecoder;
}
CMyComPtr<ICryptoSetPassword> cryptoSetPassword;
RINOK(cryptoFilter.QueryInterface(IID_ICryptoSetPassword, &cryptoSetPassword));
if (!getTextPassword)
extractCallback->QueryInterface(IID_ICryptoGetTextPassword, (void **)&getTextPassword);
if (getTextPassword)
{
CMyComBSTR password;
RINOK(getTextPassword->CryptoGetTextPassword(&password));
AString charPassword;
if (wzAesMode || pkAesMode)
{
charPassword = UnicodeStringToMultiByte((const wchar_t *)password, CP_ACP);
/*
for (int i = 0;; i++)
{
wchar_t c = password[i];
if (c == 0)
break;
if (c >= 0x80)
{
res = NArchive::NExtract::NOperationResult::kDataError;
return S_OK;
}
charPassword += (char)c;
}
*/
}
else
{
// we use OEM. WinZip/Windows probably use ANSI for some files
charPassword = UnicodeStringToMultiByte((const wchar_t *)password, CP_OEMCP);
}
HRESULT result = cryptoSetPassword->CryptoSetPassword(
(const Byte *)(const char *)charPassword, charPassword.Length());
if (result != S_OK)
return S_OK;
}
else
{
RINOK(cryptoSetPassword->CryptoSetPassword(0, 0));
}
}
int m;
for (m = 0; m < methodItems.Size(); m++)
if (methodItems[m].ZipMethod == methodId)
break;
if (m == methodItems.Size())
{
CMethodItem mi;
mi.ZipMethod = methodId;
if (methodId == NFileHeader::NCompressionMethod::kStored)
mi.Coder = new NCompress::CCopyCoder;
else if (methodId == NFileHeader::NCompressionMethod::kShrunk)
mi.Coder = new NCompress::NShrink::CDecoder;
else if (methodId == NFileHeader::NCompressionMethod::kImploded)
mi.Coder = new NCompress::NImplode::NDecoder::CCoder;
else if (methodId == NFileHeader::NCompressionMethod::kLZMA)
mi.Coder = new CLzmaDecoder;
else
{
CMethodId szMethodID;
if (methodId == NFileHeader::NCompressionMethod::kBZip2)
szMethodID = kMethodId_BZip2;
else
{
if (methodId > 0xFF)
{
res = NArchive::NExtract::NOperationResult::kUnSupportedMethod;
return S_OK;
}
szMethodID = kMethodId_ZipBase + (Byte)methodId;
}
RINOK(CreateCoder(EXTERNAL_CODECS_LOC_VARS szMethodID, mi.Coder, false));
if (mi.Coder == 0)
{
res = NArchive::NExtract::NOperationResult::kUnSupportedMethod;
return S_OK;
}
}
m = methodItems.Add(mi);
}
ICompressCoder *coder = methodItems[m].Coder;
{
CMyComPtr<ICompressSetDecoderProperties2> setDecoderProperties;
coder->QueryInterface(IID_ICompressSetDecoderProperties2, (void **)&setDecoderProperties);
if (setDecoderProperties)
{
Byte properties = (Byte)item.Flags;
RINOK(setDecoderProperties->SetDecoderProperties2(&properties, 1));
}
}
#ifdef COMPRESS_MT
{
CMyComPtr<ICompressSetCoderMt> setCoderMt;
coder->QueryInterface(IID_ICompressSetCoderMt, (void **)&setCoderMt);
if (setCoderMt)
{
RINOK(setCoderMt->SetNumberOfThreads(numThreads));
}
}
#endif
{
HRESULT result = S_OK;
CMyComPtr<ISequentialInStream> inStreamNew;
if (item.IsEncrypted())
{
if (!filterStream)
{
filterStreamSpec = new CFilterCoder;
filterStream = filterStreamSpec;
}
filterStreamSpec->Filter = cryptoFilter;
if (wzAesMode)
{
result = _wzAesDecoderSpec->ReadHeader(inStream);
}
else if (pkAesMode)
{
result =_pkAesDecoderSpec->ReadHeader(inStream, item.FileCRC, item.UnPackSize);
if (result == S_OK)
{
bool passwOK;
result = _pkAesDecoderSpec->CheckPassword(passwOK);
if (result == S_OK && !passwOK)
result = S_FALSE;
}
}
else
{
result = _zipCryptoDecoderSpec->ReadHeader(inStream);
}
if (result == S_OK)
{
RINOK(filterStreamSpec->SetInStream(inStream));
inStreamReleaser.FilterCoder = filterStreamSpec;
inStreamNew = filterStream;
if (wzAesMode)
{
if (!_wzAesDecoderSpec->CheckPasswordVerifyCode())
result = S_FALSE;
}
}
}
else
inStreamNew = inStream;
if (result == S_OK)
result = coder->Code(inStreamNew, outStream, NULL, &item.UnPackSize, compressProgress);
if (result == S_FALSE)
return S_OK;
if (result == E_NOTIMPL)
{
res = NArchive::NExtract::NOperationResult::kUnSupportedMethod;
return S_OK;
}
RINOK(result);
}
bool crcOK = true;
bool authOk = true;
if (needCRC)
crcOK = (outStreamSpec->GetCRC() == item.FileCRC);
if (wzAesMode)
{
inStream.Attach(archive.CreateLimitedStream(authenticationPos, NCrypto::NWzAes::kMacSize));
if (_wzAesDecoderSpec->CheckMac(inStream, authOk) != S_OK)
authOk = false;
}
res = ((crcOK && authOk) ?
NArchive::NExtract::NOperationResult::kOK :
NArchive::NExtract::NOperationResult::kCRCError);
return S_OK;
}
HRESULT CUnpacker::Unpack(IInStream *inStream, const CResource &resource,
ISequentialOutStream *outStream, ICompressProgressInfo *progress)
{
RINOK(inStream->Seek(resource.Offset, STREAM_SEEK_SET, NULL));
CLimitedSequentialInStream *limitedStreamSpec = new CLimitedSequentialInStream();
CMyComPtr<ISequentialInStream> limitedStream = limitedStreamSpec;
limitedStreamSpec->SetStream(inStream);
if (!copyCoder)
{
copyCoderSpec = new NCompress::CCopyCoder;
copyCoder = copyCoderSpec;
}
if (!resource.IsCompressed())
{
if (resource.PackSize != resource.UnpackSize)
return S_FALSE;
limitedStreamSpec->Init(resource.PackSize);
return copyCoder->Code(limitedStreamSpec, outStream, NULL, NULL, progress);
}
if (resource.UnpackSize == 0)
return S_OK;
UInt64 numChunks = (resource.UnpackSize + kChunkSize - 1) >> kChunkSizeBits;
unsigned entrySize = ((resource.UnpackSize > (UInt64)1 << 32) ? 8 : 4);
UInt64 sizesBufSize64 = entrySize * (numChunks - 1);
UInt32 sizesBufSize = (UInt32)sizesBufSize64;
if (sizesBufSize != sizesBufSize64)
return E_OUTOFMEMORY;
if (sizesBufSize > sizesBuf.GetCapacity())
{
sizesBuf.Free();
sizesBuf.SetCapacity(sizesBufSize);
}
RINOK(ReadBytes(inStream, (Byte *)sizesBuf, sizesBufSize));
const Byte *p = (const Byte *)sizesBuf;
if (!lzxDecoder)
{
lzxDecoderSpec = new NCompress::NLzx::CDecoder(true);
lzxDecoder = lzxDecoderSpec;
RINOK(lzxDecoderSpec->SetParams(kChunkSizeBits));
}
UInt64 baseOffset = resource.Offset + sizesBufSize64;
UInt64 outProcessed = 0;
for (UInt32 i = 0; i < (UInt32)numChunks; i++)
{
UInt64 offset = 0;
if (i > 0)
{
if (entrySize == 4)
offset = GetUInt32FromMem(p);
else
offset = GetUInt64FromMem(p);
p += entrySize;
}
UInt64 nextOffset = resource.PackSize - sizesBufSize64;
if (i + 1 < (UInt32)numChunks)
if (entrySize == 4)
nextOffset = GetUInt32FromMem(p);
else
nextOffset = GetUInt64FromMem(p);
if (nextOffset < offset)
return S_FALSE;
RINOK(inStream->Seek(baseOffset + offset, STREAM_SEEK_SET, NULL));
UInt64 inSize = nextOffset - offset;
limitedStreamSpec->Init(inSize);
if (progress)
{
RINOK(progress->SetRatioInfo(&offset, &outProcessed));
}
UInt32 outSize = kChunkSize;
if (outProcessed + outSize > resource.UnpackSize)
outSize = (UInt32)(resource.UnpackSize - outProcessed);
UInt64 outSize64 = outSize;
lzxDecoderSpec->SetKeepHistory(false);
ICompressCoder *coder = (inSize == outSize) ? copyCoder : lzxDecoder;
RINOK(coder->Code(limitedStreamSpec, outStream, NULL, &outSize64, NULL));
outProcessed += outSize;
}
return S_OK;
}