Keep only base/extractor.[cc|h].

third_party/lzma/v4_65/files/CPP/7zip/Archive/Lzma/LzmaIn.cpp

-// Archive/LzmaIn.cpp
-
-#include "StdAfx.h"
-
-#include "LzmaIn.h"
-
-#include "../../Common/StreamUtils.h"
-
-namespace NArchive {
-namespace NLzma {
- 
-static bool CheckDictSize(const Byte *p)
-{
-  UInt32 dicSize = GetUi32(p);
-  int i;
-  for (i = 1; i <= 30; i++)
-    if (dicSize == ((UInt32)2 << i) || dicSize == ((UInt32)3 << i))
-      return true;
-  return false;
-}
-
-HRESULT ReadStreamHeader(ISequentialInStream *inStream, CHeader &block)
-{
-  Byte sig[5 + 9];
-  RINOK(ReadStream_FALSE(inStream, sig, 5 + 8));
-
-  const Byte kMaxProp0Val = 5 * 5 * 9 - 1;
-  if (sig[0] > kMaxProp0Val)
-    return S_FALSE;
-
-  for (int i = 0; i < 5; i++)
-    block.LzmaProps[i] = sig[i];
-  
-  block.IsThereFilter = false;
-  block.FilterMethod = 0;
-
-  if (!CheckDictSize(sig + 1))
-  {
-    if (sig[0] > 1 || sig[1] > kMaxProp0Val)
-      return S_FALSE;
-    block.IsThereFilter = true;
-    block.FilterMethod = sig[0];
-    for (int i = 0; i < 5; i++)
-      block.LzmaProps[i] = sig[i + 1];
-    if (!CheckDictSize(block.LzmaProps + 1))
-      return S_FALSE;
-    RINOK(ReadStream_FALSE(inStream, sig + 5 + 8, 1));
-  }
-  UInt32 unpOffset = 5 + (block.IsThereFilter ? 1 : 0);
-  block.UnpackSize = GetUi64(sig + unpOffset);
-  if (block.HasUnpackSize() && block.UnpackSize >= ((UInt64)1 << 56))
-    return S_FALSE;
-  return S_OK;
-}
-
-}}