Update to 7-Zip 17.01 Beta from Igor Pavlov

- Minor speed optimization for LZMA2 (xz and 7z) multi-threading compression.
  7-Zip now uses additional memory buffers for multi-block LZMA2 compression.
  CPU utilization was slightly improved.
- 7-zip now creates multi-block xz archives by default. Block size can be
  specified with -ms[Size]{m|g} switch.
- xz decoder now can unpack random block from multi-block xz archives.  7-Zip
  File Manager now can open nested multi-block xz archives (for example,
  image.iso.xz) without full unpacking of xz archive.
- 7-Zip now can create zip archives from stdin to stdout.
- 7-Zip command line: @listfile now doesn't work after -- switch.  Use
  -i@listfile before -- switch instead.

fixed bugs:
- 7-Zip could add unrequired alternate file streams to WIM archives, for
  commands that contain filename wildcards and -sns switch.
- 7-Zip 17.00 beta crashed for commands that write anti-item to 7z archive.
- 7-Zip 17.00 beta ignored "Use large memory pages" option.

CPP/Windows/FileDir.cpp

@@ -128,6 +128,15 @@ bool SetFileAttrib(CFSTR path, DWORD attrib)
   return false;
 }
 
+
+bool SetFileAttrib_PosixHighDetect(CFSTR path, DWORD attrib)
+{
+  if ((attrib & 0xF0000000) != 0)
+    attrib &= 0x3FFF;
+  return SetFileAttrib(path, attrib);
+}
+
+
 bool RemoveDir(CFSTR path)
 {
   #ifndef _UNICODE

CPP/Windows/FileDir.h

@@ -15,7 +15,20 @@ bool GetWindowsDir(FString &path);
 bool GetSystemDir(FString &path);
 
 bool SetDirTime(CFSTR path, const FILETIME *cTime, const FILETIME *aTime, const FILETIME *mTime);
+
+
 bool SetFileAttrib(CFSTR path, DWORD attrib);
+
+/*
+  Some programs store posix attributes in high 16 bits of windows attributes field.
+  Also some programs use additional flag markers: 0x8000 or 0x4000.
+  SetFileAttrib_PosixHighDetect() tries to detect posix field, and it extracts only attribute
+  bits that are related to current system only.
+*/
+
+bool SetFileAttrib_PosixHighDetect(CFSTR path, DWORD attrib);
+
+
 bool MyMoveFile(CFSTR existFileName, CFSTR newFileName);
 
 #ifndef UNDER_CE