4.20

7zip/Compress/Shrink/DllExports.cpp

@@ -0,0 +1,64 @@
+// DLLExports.cpp
+
+#include "StdAfx.h"
+
+#include "Common/MyInitGuid.h"
+#include "Common/ComTry.h"
+#include "ShrinkDecoder.h"
+
+// {23170F69-40C1-278B-0401-010000000000}
+DEFINE_GUID(CLSID_CCompressShrinkDecoder, 
+0x23170F69, 0x40C1, 0x278B, 0x04, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00);
+
+extern "C"
+BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID /*lpReserved*/)
+{
+	return TRUE;
+}
+
+STDAPI CreateObject(const GUID *clsid, const GUID *iid, void **outObject)
+{
+  COM_TRY_BEGIN
+  *outObject = 0;
+  if (*clsid != CLSID_CCompressShrinkDecoder)
+    return CLASS_E_CLASSNOTAVAILABLE;
+  if (*iid != IID_ICompressCoder)
+    return E_NOINTERFACE;
+  CMyComPtr<ICompressCoder> coder = (ICompressCoder *)new NCompress::NShrink::CDecoder;
+  *outObject = coder.Detach();
+  COM_TRY_END
+  return S_OK;
+}
+
+STDAPI GetNumberOfMethods(UINT32 *numMethods)
+{
+  *numMethods = 1;
+  return S_OK;
+}
+
+STDAPI GetMethodProperty(UINT32 index, PROPID propID, PROPVARIANT *value)
+{
+  if (index != 0)
+    return E_INVALIDARG;
+  ::VariantClear((tagVARIANT *)value);
+  switch(propID)
+  {
+    case NMethodPropID::kID:
+    {
+      const char id[] = { 0x04, 0x01, 0x01 };
+      if ((value->bstrVal = ::SysAllocStringByteLen(id, sizeof(id))) != 0)
+        value->vt = VT_BSTR;
+      return S_OK;
+    }
+    case NMethodPropID::kName:
+      if ((value->bstrVal = ::SysAllocString(L"Shrink")) != 0)
+        value->vt = VT_BSTR;
+      return S_OK;
+    case NMethodPropID::kDecoder:
+      if ((value->bstrVal = ::SysAllocStringByteLen(
+          (const char *)&CLSID_CCompressShrinkDecoder, sizeof(GUID))) != 0)
+        value->vt = VT_BSTR;
+      return S_OK;
+  }
+  return S_OK;
+}

7zip/Compress/Shrink/ShrinkDecoder.cpp

@@ -0,0 +1,149 @@
+// ShrinkDecoder.cpp
+
+#include "StdAfx.h"
+
+#include "ShrinkDecoder.h"
+
+#include "../../../Common/Alloc.h"
+#include "../../Common/InBuffer.h"
+#include "../../Common/OutBuffer.h"
+#include "../../Common/LSBFDecoder.h"
+
+namespace NCompress {
+namespace NShrink {
+
+static const UInt32 kBufferSize = (1 << 20);
+
+static const int kNumMinBits = 9;   
+
+STDMETHODIMP CDecoder ::CodeReal(ISequentialInStream *inStream,
+    ISequentialOutStream *outStream, const UInt64 *inSize, const UInt64 *outSize,
+    ICompressProgressInfo *progress)
+{
+  NStream::NLSBF::CBaseDecoder<CInBuffer> inBuffer;
+  COutBuffer outBuffer;
+
+  if (!inBuffer.Create(kBufferSize))
+    return E_OUTOFMEMORY;
+  inBuffer.SetStream(inStream);
+  inBuffer.Init();
+
+  if (!outBuffer.Create(kBufferSize))
+    return E_OUTOFMEMORY;
+  outBuffer.SetStream(outStream);
+  outBuffer.Init();
+
+  UInt64 prevPos = 0;
+  int numBits = kNumMinBits;
+  UInt32 head = 257;
+
+  bool needPrev = false;
+
+  _parents[256] = 0; // virus protection
+  _suffixes[256] = 0;
+
+  int i;
+  for (i = 0; i < 257; i++)
+    _isFree[i] = false;
+  for (; i < kNumItems; i++)
+    _isFree[i] = true;
+
+  UInt32 lastSymbol = 0;
+  while (true)
+  {
+    outBuffer.Flush();
+    UInt32 symbol = inBuffer.ReadBits(numBits);
+    if (inBuffer.ExtraBitsWereRead())
+      break;
+    if (_isFree[symbol])
+      return S_FALSE;
+    if (symbol == 256)
+    {
+      // fix it;
+      UInt32 symbol = inBuffer.ReadBits(numBits);
+      if (symbol == 1)
+      {
+        if (numBits < kNumMaxBits)
+          numBits++;
+      }
+      else if (symbol == 2)
+      {
+        /* 
+        maybe need delete prev also ?
+        if (needPrev)
+          _isFree[head - 1] = true;
+        */
+        for (i = 257; i < kNumItems; i++)
+          _isParent[i] = false;
+        for (i = 257; i < kNumItems; i++)
+          if (!_isFree[i])
+            _isParent[_parents[i]] = true;
+        for (i = 257; i < kNumItems; i++)
+          if (!_isParent[i])
+            _isFree[i] = true;
+        head = 257;
+        while(head < ((UInt32)1 << numBits) && !_isFree[head])
+          head++;
+        if (head < ((UInt32)1 << numBits))
+        {
+          needPrev = true;
+          _isFree[head] = false;
+          _parents[head] = (UInt16)lastSymbol;
+          head++;
+        }
+      }
+      else 
+        return S_FALSE;
+      continue;
+    }
+    UInt32 cur = symbol;
+    i = 0;
+    while (cur >= 256)
+    {
+      _stack[i++] = _suffixes[cur];
+      cur = _parents[cur];
+    }
+    _stack[i++] = (Byte)cur;
+    if (needPrev)
+    {
+      _suffixes[head - 1] = (Byte)cur;
+      if (symbol == head - 1)
+        _stack[0] = (Byte)cur;
+    }
+    while (i > 0)
+      outBuffer.WriteByte((_stack[--i]));
+    while(head < ((UInt32)1 << numBits) && !_isFree[head])
+      head++;
+    if (head < ((UInt32)1 << numBits))
+    {
+      needPrev = true;
+      _isFree[head] = false;
+      _parents[head] = (UInt16)symbol;
+      head++;
+    }
+    else
+      needPrev = false;
+    lastSymbol = symbol;
+
+    UInt64 nowPos = outBuffer.GetProcessedSize();
+    if (progress != NULL && nowPos - prevPos > (1 << 18))
+    {
+      prevPos = nowPos;
+      UInt64 packSize = inBuffer.GetProcessedSize();
+      RINOK(progress->SetRatioInfo(&packSize, &nowPos));
+    }
+  }
+  return outBuffer.Flush();
+}
+
+STDMETHODIMP CDecoder ::Code(ISequentialInStream *inStream,
+    ISequentialOutStream *outStream, const UInt64 *inSize, const UInt64 *outSize,
+    ICompressProgressInfo *progress)
+{
+  try { return CodeReal(inStream, outStream, inSize, outSize, progress); }
+  catch(const CInBufferException &e) { return e.ErrorCode; }
+  catch(const COutBufferException &e) { return e.ErrorCode; }
+  catch(...) { return S_FALSE; }
+}
+
+}}

7zip/Compress/Shrink/ShrinkDecoder.h

@@ -0,0 +1,39 @@
+// ShrinkDecoder.h
+
+#ifndef __SHRINK_DECODER_H
+#define __SHRINK_DECODER_H
+
+#include "../../../Common/MyCom.h"
+
+#include "../../ICoder.h"
+
+namespace NCompress {
+namespace NShrink {
+
+const int kNumMaxBits = 13;   
+const UInt32 kNumItems = 1 << kNumMaxBits;   
+
+class CDecoder :
+  public ICompressCoder,
+  public CMyUnknownImp
+{
+  UInt16 _parents[kNumItems];
+  Byte _suffixes[kNumItems];
+  Byte _stack[kNumItems];
+  bool _isFree[kNumItems];
+  bool _isParent[kNumItems];
+public:
+  MY_UNKNOWN_IMP
+
+  STDMETHOD(CodeReal)(ISequentialInStream *inStream, ISequentialOutStream *outStream, 
+      const UInt64 *inSize, const UInt64 *outSize,
+      ICompressProgressInfo *progress);
+  
+  STDMETHOD(Code)(ISequentialInStream *inStream, ISequentialOutStream *outStream, 
+      const UInt64 *inSize, const UInt64 *outSize,
+      ICompressProgressInfo *progress);
+};
+
+}}
+
+#endif

7zip/Compress/Shrink/StdAfx.cpp

@@ -0,0 +1,3 @@
+// StdAfx.cpp
+
+#include "StdAfx.h"

7zip/Compress/Shrink/StdAfx.h

@@ -0,0 +1,8 @@
+// StdAfx.h
+
+#ifndef __STDAFX_H
+#define __STDAFX_H
+
+#include "../../../Common/MyWindows.h"
+
+#endif

7zip/Compress/Shrink/resource.h

@@ -0,0 +1,15 @@
+//{{NO_DEPENDENCIES}}
+// Microsoft Developer Studio generated include file.
+// Used by resource.rc
+//
+
+// Next default values for new objects
+// 
+#ifdef APSTUDIO_INVOKED
+#ifndef APSTUDIO_READONLY_SYMBOLS
+#define _APS_NEXT_RESOURCE_VALUE        101
+#define _APS_NEXT_COMMAND_VALUE         40001
+#define _APS_NEXT_CONTROL_VALUE         1000
+#define _APS_NEXT_SYMED_VALUE           101
+#endif
+#endif