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// MslzHandler.cpp
#include "StdAfx.h"
#include "../../../C/CpuArch.h"
#include "Common/ComTry.h"
#include "Common/MyString.h"
#include "Windows/PropVariant.h"
#include "../Common/InBuffer.h"
#include "../Common/ProgressUtils.h"
#include "../Common/RegisterArc.h"
#include "../Common/StreamUtils.h"
#include "Common/DummyOutStream.h"
namespace NArchive {
namespace NMslz {
class CHandler:
public IInArchive,
public CMyUnknownImp
{
CMyComPtr<IInStream> _stream;
UInt32 _size;
UInt64 _packSize;
UString _name;
public:
MY_UNKNOWN_IMP1(IInArchive)
INTERFACE_IInArchive(;)
};
STATPROPSTG kProps[] =
{
{ NULL, kpidPath, VT_BSTR},
{ NULL, kpidSize, VT_UI8},
{ NULL, kpidPackSize, VT_UI8},
};
IMP_IInArchive_Props
IMP_IInArchive_ArcProps_NO
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 (!_name.IsEmpty()) prop = _name; break;
case kpidSize: prop = _size; break;
case kpidPackSize: prop = _packSize; break;
}
prop.Detach(value);
return S_OK;
COM_TRY_END
}
static const unsigned kSignatureSize = 9;
static const unsigned kHeaderSize = kSignatureSize + 1 + 4;
#define MSLZ_SIGNATURE { 0x53, 0x5A, 0x44, 0x44, 0x88, 0xF0, 0x27, 0x33, 0x41 }
// old signature: 53 5A 20 88 F0 27 33
static const Byte signature[kSignatureSize] = MSLZ_SIGNATURE;
static const wchar_t *g_Exts[] =
{
L"dll",
L"exe",
L"kmd",
L"sys"
};
STDMETHODIMP CHandler::Open(IInStream *stream, const UInt64 * /* maxCheckStartPosition */,
IArchiveOpenCallback *callback)
{
COM_TRY_BEGIN
{
Close();
Byte buffer[kHeaderSize];
RINOK(ReadStream_FALSE(stream, buffer, kHeaderSize));
if (memcmp(buffer, signature, kSignatureSize) != 0)
return S_FALSE;
_size = GetUi32(buffer + 10);
if (_size > 0xFFFFFFE0)
return S_FALSE;
RINOK(stream->Seek(0, STREAM_SEEK_END, &_packSize));
if (callback)
{
CMyComPtr<IArchiveOpenVolumeCallback> openVolumeCallback;
callback->QueryInterface(IID_IArchiveOpenVolumeCallback, (void **)&openVolumeCallback);
if (openVolumeCallback)
{
NWindows::NCOM::CPropVariant prop;
if (openVolumeCallback->GetProperty(kpidName, &prop) == S_OK && prop.vt == VT_BSTR)
{
UString baseName = prop.bstrVal;
if (!baseName.IsEmpty() && baseName.Back() == L'_')
{
baseName.DeleteBack();
Byte replaceByte = buffer[kSignatureSize];
if (replaceByte == 0)
{
for (int i = 0; i < sizeof(g_Exts) / sizeof(g_Exts[0]); i++)
{
UString s = g_Exts[i];
int len = s.Length();
Byte b = (Byte)s.Back();
s.DeleteBack();
if (baseName.Length() >= len &&
baseName[baseName.Length() - len] == '.' &&
s.CompareNoCase(baseName.Right(len - 1)) == 0)
{
replaceByte = b;
break;
}
}
}
if (replaceByte >= 0x20 && replaceByte < 0x80)
_name = baseName + (wchar_t)replaceByte;
}
}
}
}
_stream = stream;
}
return S_OK;
COM_TRY_END
}
STDMETHODIMP CHandler::Close()
{
_stream.Release();
_name.Empty();
return S_OK;
}
// MslzDec is modified LZSS algorithm of Haruhiko Okumura:
// maxLen = 18; Okumura
// maxLen = 16; MS
#define PROGRESS_AND_WRITE \
if ((dest & kMask) == 0) { RINOK(WriteStream(outStream, buf, kBufSize)); \
if ((dest & ((1 << 20) - 1)) == 0) \
{ UInt64 inSize = inStream.GetProcessedSize(); UInt64 outSize = dest; \
RINOK(progress->SetRatioInfo(&inSize, &outSize)); }}
static HRESULT MslzDec(CInBuffer &inStream, ISequentialOutStream *outStream, UInt32 unpackSize, ICompressProgressInfo *progress)
{
const unsigned kBufSize = (1 << 12);
const unsigned kMask = kBufSize - 1;
Byte buf[kBufSize];
UInt32 dest = 0;
memset(buf, ' ', kBufSize);
while (dest < unpackSize)
{
Byte b;
if (!inStream.ReadByte(b))
return S_FALSE;
for (unsigned mask = (unsigned)b | 0x100; mask > 1 && dest < unpackSize; mask >>= 1)
{
if (!inStream.ReadByte(b))
return S_FALSE;
if (mask & 1)
{
buf[dest++ & kMask] = b;
PROGRESS_AND_WRITE
}
else
{
Byte b1;
if (!inStream.ReadByte(b1))
return S_FALSE;
const unsigned kMaxLen = 16; // 18 in Okumura's code.
unsigned src = (((((unsigned)b1 & 0xF0) << 4) | b) + kMaxLen) & kMask;
unsigned len = (b1 & 0xF) + 3;
if (len > kMaxLen || dest + len > unpackSize)
return S_FALSE;
do
{
buf[dest++ & kMask] = buf[src++ & kMask];
PROGRESS_AND_WRITE
}
while (--len != 0);
}
}
}
return WriteStream(outStream, buf, dest & kMask);
}
STDMETHODIMP CHandler::Extract(const UInt32 *indices, UInt32 numItems,
Int32 testMode, IArchiveExtractCallback *extractCallback)
{
COM_TRY_BEGIN
if (numItems == 0)
return S_OK;
if (numItems != (UInt32)-1 && (numItems != 1 || indices[0] != 0))
return E_INVALIDARG;
extractCallback->SetTotal(_size);
CMyComPtr<ISequentialOutStream> realOutStream;
Int32 askMode = testMode ?
NExtract::NAskMode::kTest :
NExtract::NAskMode::kExtract;
RINOK(extractCallback->GetStream(0, &realOutStream, askMode));
if (!testMode && !realOutStream)
return S_OK;
extractCallback->PrepareOperation(askMode);
CDummyOutStream *outStreamSpec = new CDummyOutStream;
CMyComPtr<ISequentialOutStream> outStream(outStreamSpec);
outStreamSpec->SetStream(realOutStream);
outStreamSpec->Init();
realOutStream.Release();
CLocalProgress *lps = new CLocalProgress;
CMyComPtr<ICompressProgressInfo> progress = lps;
lps->Init(extractCallback, false);
RINOK(_stream->Seek(0, STREAM_SEEK_SET, NULL));
CInBuffer s;
if (!s.Create(1 << 20))
return E_OUTOFMEMORY;
s.SetStream(_stream);
s.Init();
Byte buffer[kHeaderSize];
Int32 opRes = NExtract::NOperationResult::kDataError;
if (s.ReadBytes(buffer, kHeaderSize) == kHeaderSize)
{
HRESULT result = MslzDec(s, outStream, _size, progress);
if (result == S_OK)
opRes = NExtract::NOperationResult::kOK;
else if (result != S_FALSE)
return result;
}
outStream.Release();
return extractCallback->SetOperationResult(opRes);
COM_TRY_END
}
static IInArchive *CreateArc() { return new CHandler; }
static CArcInfo g_ArcInfo =
{ L"MsLZ", L"", 0, 0xD5, MSLZ_SIGNATURE, kSignatureSize, false, CreateArc, 0 };
REGISTER_ARC(Mslz)
}}
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