1 files changed, 613 insertions, 0 deletions

diff --git a/CPP/Windows/FileLink.cpp b/CPP/Windows/FileLink.cpp
new file mode 100644
index 0000000..8ce634f
--- /dev/null
+++ b/CPP/Windows/FileLink.cpp
@@ -0,0 +1,613 @@
+// Windows/FileLink.cpp
+
+#include "StdAfx.h"
+
+#include "../../C/CpuArch.h"
+
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
+#ifdef SUPPORT_DEVICE_FILE
+#include "../../C/Alloc.h"
+#endif
+
+#include "../Common/UTFConvert.h"
+#include "../Common/StringConvert.h"
+
+#include "FileDir.h"
+#include "FileFind.h"
+#include "FileIO.h"
+#include "FileName.h"
+
+#ifndef _UNICODE
+extern bool g_IsNT;
+#endif
+
+namespace NWindows {
+namespace NFile {
+
+using namespace NName;
+
+/*
+  Reparse Points (Junctions and Symbolic Links):
+  struct
+  {
+    UInt32 Tag;
+    UInt16 Size;     // not including starting 8 bytes
+    UInt16 Reserved; // = 0
+    
+    UInt16 SubstituteOffset; // offset in bytes from  start of namesChars
+    UInt16 SubstituteLen;    // size in bytes, it doesn't include tailed NUL
+    UInt16 PrintOffset;      // offset in bytes from  start of namesChars
+    UInt16 PrintLen;         // size in bytes, it doesn't include tailed NUL
+    
+    [UInt32] Flags;  // for Symbolic Links only.
+    
+    UInt16 namesChars[]
+  }
+
+  MOUNT_POINT (Junction point):
+    1) there is NUL wchar after path
+    2) Default Order in table:
+         Substitute Path
+         Print Path
+    3) pathnames can not contain dot directory names
+
+  SYMLINK:
+    1) there is no NUL wchar after path
+    2) Default Order in table:
+         Print Path
+         Substitute Path
+*/
+
+/*
+Win10 WSL2:
+admin rights + sudo: it creates normal windows symbolic link.
+in another cases   : it creates IO_REPARSE_TAG_LX_SYMLINK repare point.
+*/
+
+/*
+static const UInt32 kReparseFlags_Alias       = (1 << 29);
+static const UInt32 kReparseFlags_HighLatency = (1 << 30);
+static const UInt32 kReparseFlags_Microsoft   = ((UInt32)1 << 31);
+
+#define _my_IO_REPARSE_TAG_HSM          (0xC0000004L)
+#define _my_IO_REPARSE_TAG_HSM2         (0x80000006L)
+#define _my_IO_REPARSE_TAG_SIS          (0x80000007L)
+#define _my_IO_REPARSE_TAG_WIM          (0x80000008L)
+#define _my_IO_REPARSE_TAG_CSV          (0x80000009L)
+#define _my_IO_REPARSE_TAG_DFS          (0x8000000AL)
+#define _my_IO_REPARSE_TAG_DFSR         (0x80000012L)
+*/
+
+#define Get16(p) GetUi16(p)
+#define Get32(p) GetUi32(p)
+
+static const wchar_t * const k_LinkPrefix = L"\\??\\";
+static const unsigned k_LinkPrefix_Size = 4;
+
+static bool IsLinkPrefix(const wchar_t *s)
+{
+  return IsString1PrefixedByString2(s, k_LinkPrefix);
+}
+
+/*
+static const wchar_t * const k_VolumePrefix = L"Volume{";
+static const bool IsVolumeName(const wchar_t *s)
+{
+  return IsString1PrefixedByString2(s, k_VolumePrefix);
+}
+*/
+
+#if defined(_WIN32) && !defined(UNDER_CE)
+
+#define Set16(p, v) SetUi16(p, v)
+#define Set32(p, v) SetUi32(p, v)
+
+static void WriteString(Byte *dest, const wchar_t *path)
+{
+  for (;;)
+  {
+    wchar_t c = *path++;
+    if (c == 0)
+      return;
+    Set16(dest, (UInt16)c);
+    dest += 2;
+  }
+}
+
+bool FillLinkData(CByteBuffer &dest, const wchar_t *path, bool isSymLink, bool isWSL)
+{
+  bool isAbs = IsAbsolutePath(path);
+  if (!isAbs && !isSymLink)
+    return false;
+
+  if (isWSL)
+  {
+    // unsupported characters probably use Replacement Character UTF-16 0xFFFD
+    AString utf;
+    ConvertUnicodeToUTF8(path, utf);
+    const size_t size = 4 + utf.Len();
+    if (size != (UInt16)size)
+      return false;
+    dest.Alloc(8 + size);
+    Byte *p = dest;
+    Set32(p, _my_IO_REPARSE_TAG_LX_SYMLINK);
+    Set16(p + 4, (UInt16)(size));
+    Set16(p + 6, 0);
+    Set32(p + 8, _my_LX_SYMLINK_FLAG);
+    memcpy(p + 12, utf.Ptr(), utf.Len());
+    return true;
+  }
+
+  // usual symbolic LINK (NOT WSL)
+
+  bool needPrintName = true;
+
+  if (IsSuperPath(path))
+  {
+    path += kSuperPathPrefixSize;
+    if (!IsDrivePath(path))
+      needPrintName = false;
+  }
+
+  const unsigned add_Prefix_Len = isAbs ? k_LinkPrefix_Size : 0;
+    
+  size_t len2 = (size_t)MyStringLen(path) * 2;
+  const size_t len1 = len2 + add_Prefix_Len * 2;
+  if (!needPrintName)
+    len2 = 0;
+
+  size_t totalNamesSize = (len1 + len2);
+
+  /* some WIM imagex software uses old scheme for symbolic links.
+     so we can old scheme for byte to byte compatibility */
+
+  bool newOrderScheme = isSymLink;
+  // newOrderScheme = false;
+
+  if (!newOrderScheme)
+    totalNamesSize += 2 * 2;
+
+  const size_t size = 8 + 8 + (isSymLink ? 4 : 0) + totalNamesSize;
+  if (size != (UInt16)size)
+    return false;
+  dest.Alloc(size);
+  memset(dest, 0, size);
+  const UInt32 tag = isSymLink ?
+      _my_IO_REPARSE_TAG_SYMLINK :
+      _my_IO_REPARSE_TAG_MOUNT_POINT;
+  Byte *p = dest;
+  Set32(p, tag);
+  Set16(p + 4, (UInt16)(size - 8));
+  Set16(p + 6, 0);
+  p += 8;
+
+  unsigned subOffs = 0;
+  unsigned printOffs = 0;
+  if (newOrderScheme)
+    subOffs = (unsigned)len2;
+  else
+    printOffs = (unsigned)len1 + 2;
+
+  Set16(p + 0, (UInt16)subOffs);
+  Set16(p + 2, (UInt16)len1);
+  Set16(p + 4, (UInt16)printOffs);
+  Set16(p + 6, (UInt16)len2);
+
+  p += 8;
+  if (isSymLink)
+  {
+    UInt32 flags = isAbs ? 0 : _my_SYMLINK_FLAG_RELATIVE;
+    Set32(p, flags);
+    p += 4;
+  }
+
+  if (add_Prefix_Len != 0)
+    WriteString(p + subOffs, k_LinkPrefix);
+  WriteString(p + subOffs + add_Prefix_Len * 2, path);
+  if (needPrintName)
+    WriteString(p + printOffs, path);
+  return true;
+}
+
+#endif // defined(_WIN32) && !defined(UNDER_CE)
+
+
+static void GetString(const Byte *p, unsigned len, UString &res)
+{
+  wchar_t *s = res.GetBuf(len);
+  unsigned i;
+  for (i = 0; i < len; i++)
+  {
+    wchar_t c = Get16(p + i * 2);
+    if (c == 0)
+      break;
+    s[i] = c;
+  }
+  s[i] = 0;
+  res.ReleaseBuf_SetLen(i);
+}
+
+bool CReparseAttr::Parse(const Byte *p, size_t size)
+{
+  ErrorCode = (DWORD)ERROR_INVALID_REPARSE_DATA;
+  HeaderError = true;
+  TagIsUnknown = true;
+  MinorError = false;
+
+  if (size < 8)
+    return false;
+  Tag = Get32(p);
+  UInt32 len = Get16(p + 4);
+  if (len + 8 != size)
+  // if (len + 8 > size)
+    return false;
+  /*
+  if ((type & kReparseFlags_Alias) == 0 ||
+      (type & kReparseFlags_Microsoft) == 0 ||
+      (type & 0xFFFF) != 3)
+  */
+
+  if (Get16(p + 6) != 0) // padding
+    return false;
+
+  HeaderError = false;
+
+  if (   Tag != _my_IO_REPARSE_TAG_MOUNT_POINT
+      && Tag != _my_IO_REPARSE_TAG_SYMLINK
+      && Tag != _my_IO_REPARSE_TAG_LX_SYMLINK)
+  {
+    // for unsupported reparse points
+    ErrorCode = (DWORD)ERROR_REPARSE_TAG_INVALID; // ERROR_REPARSE_TAG_MISMATCH
+    // errorCode = ERROR_REPARSE_TAG_MISMATCH; // ERROR_REPARSE_TAG_INVALID
+    return false;
+  }
+
+  TagIsUnknown = false;
+ 
+  p += 8;
+  size -= 8;
+  
+  if (Tag == _my_IO_REPARSE_TAG_LX_SYMLINK)
+  {
+    if (len < 4)
+      return false;
+    Flags = Get32(p); // maybe it's not Flags
+    if (Flags != _my_LX_SYMLINK_FLAG)
+      return false;
+    len -= 4;
+    p += 4;
+    char *s = WslName.GetBuf(len);
+    unsigned i;
+    for (i = 0; i < len; i++)
+    {
+      char c = (char)p[i];
+      s[i] = c;
+      if (c == 0)
+        break;
+    }
+    WslName.ReleaseBuf_SetEnd(i);
+    MinorError = (i != len);
+    ErrorCode = 0;
+    return true;
+  }
+  
+  if (len < 8)
+    return false;
+  unsigned subOffs = Get16(p);
+  unsigned subLen = Get16(p + 2);
+  unsigned printOffs = Get16(p + 4);
+  unsigned printLen = Get16(p + 6);
+  len -= 8;
+  p += 8;
+
+  Flags = 0;
+  if (Tag == _my_IO_REPARSE_TAG_SYMLINK)
+  {
+    if (len < 4)
+      return false;
+    Flags = Get32(p);
+    len -= 4;
+    p += 4;
+  }
+
+  if ((subOffs & 1) != 0 || subOffs > len || len - subOffs < subLen)
+    return false;
+  if ((printOffs & 1) != 0 || printOffs > len || len - printOffs < printLen)
+    return false;
+  GetString(p + subOffs, subLen >> 1, SubsName);
+  GetString(p + printOffs, printLen >> 1, PrintName);
+
+  ErrorCode = 0;
+  return true;
+}
+
+
+bool CReparseShortInfo::Parse(const Byte *p, size_t size)
+{
+  const Byte *start = p;
+  Offset= 0;
+  Size = 0;
+  if (size < 8)
+    return false;
+  UInt32 Tag = Get32(p);
+  UInt32 len = Get16(p + 4);
+  if (len + 8 > size)
+    return false;
+  /*
+  if ((type & kReparseFlags_Alias) == 0 ||
+      (type & kReparseFlags_Microsoft) == 0 ||
+      (type & 0xFFFF) != 3)
+  */
+  if (Tag != _my_IO_REPARSE_TAG_MOUNT_POINT &&
+      Tag != _my_IO_REPARSE_TAG_SYMLINK)
+    // return true;
+    return false;
+
+  if (Get16(p + 6) != 0) // padding
+    return false;
+  
+  p += 8;
+  size -= 8;
+  
+  if (len != size) // do we need that check?
+    return false;
+  
+  if (len < 8)
+    return false;
+  unsigned subOffs = Get16(p);
+  unsigned subLen = Get16(p + 2);
+  unsigned printOffs = Get16(p + 4);
+  unsigned printLen = Get16(p + 6);
+  len -= 8;
+  p += 8;
+
+  // UInt32 Flags = 0;
+  if (Tag == _my_IO_REPARSE_TAG_SYMLINK)
+  {
+    if (len < 4)
+      return false;
+    // Flags = Get32(p);
+    len -= 4;
+    p += 4;
+  }
+
+  if ((subOffs & 1) != 0 || subOffs > len || len - subOffs < subLen)
+    return false;
+  if ((printOffs & 1) != 0 || printOffs > len || len - printOffs < printLen)
+    return false;
+
+  Offset = (unsigned)(p - start) + subOffs;
+  Size = subLen;
+  return true;
+}
+
+bool CReparseAttr::IsOkNamePair() const
+{
+  if (IsLinkPrefix(SubsName))
+  {
+    if (!IsDrivePath(SubsName.Ptr(k_LinkPrefix_Size)))
+      return PrintName.IsEmpty();
+    if (wcscmp(SubsName.Ptr(k_LinkPrefix_Size), PrintName) == 0)
+      return true;
+  }
+  return wcscmp(SubsName, PrintName) == 0;
+}
+
+/*
+bool CReparseAttr::IsVolume() const
+{
+  if (!IsLinkPrefix(SubsName))
+    return false;
+  return IsVolumeName(SubsName.Ptr(k_LinkPrefix_Size));
+}
+*/
+
+UString CReparseAttr::GetPath() const
+{
+  if (IsSymLink_WSL())
+  {
+    UString u;
+    // if (CheckUTF8(attr.WslName)
+    if (!ConvertUTF8ToUnicode(WslName, u))
+      MultiByteToUnicodeString2(u, WslName);
+    return u;
+  }
+
+  UString s (SubsName);
+  if (IsLinkPrefix(s))
+  {
+    s.ReplaceOneCharAtPos(1, '\\'); // we normalize prefix from "\??\" to "\\?\"
+    if (IsDrivePath(s.Ptr(k_LinkPrefix_Size)))
+      s.DeleteFrontal(k_LinkPrefix_Size);
+  }
+  return s;
+}
+
+#ifdef SUPPORT_DEVICE_FILE
+
+namespace NSystem
+{
+bool MyGetDiskFreeSpace(CFSTR rootPath, UInt64 &clusterSize, UInt64 &totalSize, UInt64 &freeSize);
+}
+#endif // SUPPORT_DEVICE_FILE
+
+#if defined(_WIN32) && !defined(UNDER_CE)
+
+namespace NIO {
+
+bool GetReparseData(CFSTR path, CByteBuffer &reparseData, BY_HANDLE_FILE_INFORMATION *fileInfo)
+{
+  reparseData.Free();
+  CInFile file;
+  if (!file.OpenReparse(path))
+    return false;
+
+  if (fileInfo)
+    file.GetFileInformation(fileInfo);
+
+  const unsigned kBufSize = MAXIMUM_REPARSE_DATA_BUFFER_SIZE;
+  CByteArr buf(kBufSize);
+  DWORD returnedSize;
+  if (!file.DeviceIoControlOut(my_FSCTL_GET_REPARSE_POINT, buf, kBufSize, &returnedSize))
+    return false;
+  reparseData.CopyFrom(buf, returnedSize);
+  return true;
+}
+
+static bool CreatePrefixDirOfFile(CFSTR path)
+{
+  FString path2 (path);
+  int pos = path2.ReverseFind_PathSepar();
+  if (pos < 0)
+    return true;
+  #ifdef _WIN32
+  if (pos == 2 && path2[1] == L':')
+    return true; // we don't create Disk folder;
+  #endif
+  path2.DeleteFrom((unsigned)pos);
+  return NDir::CreateComplexDir(path2);
+}
+
+
+static bool OutIoReparseData(DWORD controlCode, CFSTR path, void *data, DWORD size)
+{
+  COutFile file;
+  if (!file.Open(path,
+      FILE_SHARE_WRITE,
+      OPEN_EXISTING,
+      FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS))
+    return false;
+
+  DWORD returnedSize;
+  return file.DeviceIoControl(controlCode, data, size, NULL, 0, &returnedSize);
+}
+
+
+// If there is Reparse data already, it still writes new Reparse data
+bool SetReparseData(CFSTR path, bool isDir, const void *data, DWORD size)
+{
+  NFile::NFind::CFileInfo fi;
+  if (fi.Find(path))
+  {
+    if (fi.IsDir() != isDir)
+    {
+      ::SetLastError(ERROR_DIRECTORY);
+      return false;
+    }
+  }
+  else
+  {
+    if (isDir)
+    {
+      if (!NDir::CreateComplexDir(path))
+        return false;
+    }
+    else
+    {
+      CreatePrefixDirOfFile(path);
+      COutFile file;
+      if (!file.Create(path, CREATE_NEW))
+        return false;
+    }
+  }
+
+  return OutIoReparseData(my_FSCTL_SET_REPARSE_POINT, path, (void *)(const Byte *)(data), size);
+}
+
+
+bool DeleteReparseData(CFSTR path)
+{
+  CByteBuffer reparseData;
+  if (!GetReparseData(path, reparseData, NULL))
+    return false;
+  /* MSDN: The tag specified in the ReparseTag member of this structure
+     must match the tag of the reparse point to be deleted,
+     and the ReparseDataLength member must be zero */
+  #define my_REPARSE_DATA_BUFFER_HEADER_SIZE 8
+  if (reparseData.Size() < my_REPARSE_DATA_BUFFER_HEADER_SIZE)
+  {
+    SetLastError(ERROR_INVALID_REPARSE_DATA);
+    return false;
+  }
+  BYTE buf[my_REPARSE_DATA_BUFFER_HEADER_SIZE];
+  memset(buf, 0, sizeof(buf));
+  memcpy(buf, reparseData, 4); // tag
+  return OutIoReparseData(my_FSCTL_DELETE_REPARSE_POINT, path, buf, sizeof(buf));
+}
+
+}
+
+#endif //  defined(_WIN32) && !defined(UNDER_CE)
+
+
+#ifndef _WIN32
+
+namespace NIO {
+
+bool GetReparseData(CFSTR path, CByteBuffer &reparseData)
+{
+  reparseData.Free();
+
+  #define MAX_PATHNAME_LEN 1024
+  char buf[MAX_PATHNAME_LEN + 2];
+  const size_t request = sizeof(buf) - 1;
+
+  // printf("\nreadlink() path = %s \n", path);
+  const ssize_t size = readlink(path, buf, request);
+  // there is no tail zero
+
+  if (size < 0)
+    return false;
+  if ((size_t)size >= request)
+  {
+    SetLastError(EINVAL); // check it: ENAMETOOLONG
+    return false;
+  }
+
+  // printf("\nreadlink() res = %s size = %d \n", buf, (int)size);
+  reparseData.CopyFrom((const Byte *)buf, (size_t)size);
+  return true;
+}
+
+
+/*
+// If there is Reparse data already, it still writes new Reparse data
+bool SetReparseData(CFSTR path, bool isDir, const void *data, DWORD size)
+{
+  // AString s;
+  // s.SetFrom_CalcLen(data, size);
+  // return (symlink(s, path) == 0);
+  UNUSED_VAR(path)
+  UNUSED_VAR(isDir)
+  UNUSED_VAR(data)
+  UNUSED_VAR(size)
+  SetLastError(ENOSYS);
+  return false;
+}
+*/
+
+bool SetSymLink(CFSTR from, CFSTR to)
+{
+  // printf("\nsymlink() %s -> %s\n", from, to);
+  int ir;
+  // ir = unlink(path);
+  // if (ir == 0)
+  ir = symlink(to, from);
+  return (ir == 0);
+}
+
+bool SetSymLink_UString(CFSTR from, const UString &to)
+{
+  AString utf;
+  ConvertUnicodeToUTF8(to, utf);
+  return SetSymLink(from, utf);
+}
+
+}
+
+#endif // !_WIN32
+
+}}