1 files changed, 118 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/FilePaths.c b/MdePkg/Library/BaseLib/FilePaths.c
new file mode 100644
index 000000000000..53e986021255
--- /dev/null
+++ b/MdePkg/Library/BaseLib/FilePaths.c
@@ -0,0 +1,118 @@
+/** @file
+  Defines file-path manipulation functions.
+
+  Copyright (c) 2011 - 2016, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php.
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+**/
+#include  <Library/BaseMemoryLib.h>
+#include  <Library/BaseLib.h>
+
+/**
+  Removes the last directory or file entry in a path. For a path which is
+  like L"fs0:startup.nsh", it's converted to L"fs0:".
+
+  @param[in,out] Path     A pointer to the path to modify.
+
+  @retval FALSE     Nothing was found to remove.
+  @retval TRUE      A directory or file was removed.
+**/
+BOOLEAN
+EFIAPI
+PathRemoveLastItem(
+  IN OUT CHAR16 *Path
+  )
+{
+  CHAR16        *Walker;
+  CHAR16        *LastSlash;
+  //
+  // get directory name from path... ('chop' off extra)
+  //
+  for ( Walker = Path, LastSlash = NULL
+      ; Walker != NULL && *Walker != CHAR_NULL
+      ; Walker++
+     ){
+    if (*Walker == L'\\' && *(Walker + 1) != CHAR_NULL) {
+      LastSlash = Walker+1;
+    } else if (*Walker == L':' && *(Walker + 1) != L'\\' && *(Walker + 1) != CHAR_NULL) {
+      LastSlash = Walker+1;
+    }
+  }
+  if (LastSlash != NULL) {
+    *LastSlash = CHAR_NULL;
+    return (TRUE);
+  }
+  return (FALSE);
+}
+
+/**
+  Function to clean up paths.
+
+  - Single periods in the path are removed.
+  - Double periods in the path are removed along with a single parent directory.
+  - Forward slashes L'/' are converted to backward slashes L'\'.
+
+  This will be done inline and the existing buffer may be larger than required
+  upon completion.
+
+  @param[in] Path       The pointer to the string containing the path.
+
+  @return       Returns Path, otherwise returns NULL to indicate that an error has occured.
+**/
+CHAR16*
+EFIAPI
+PathCleanUpDirectories(
+  IN CHAR16 *Path
+)
+{
+  CHAR16  *TempString;
+
+  if (Path == NULL) {
+    return NULL;
+  }
+
+  //
+  // Replace the '/' with '\'
+  //
+  for (TempString = Path; *TempString != CHAR_NULL; TempString++) {
+    if (*TempString == L'/') {
+      *TempString = L'\\';
+    }
+  }
+
+  //
+  // Remove all the "\.". E.g.: fs0:\abc\.\def\.
+  //
+  while ((TempString = StrStr (Path, L"\\.\\")) != NULL) {
+    CopyMem (TempString, TempString + 2, StrSize (TempString + 2));
+  }
+  if (StrCmp (Path + StrLen (Path) - 2, L"\\.") == 0) {
+    Path[StrLen (Path) - 1] = CHAR_NULL;
+  }
+
+  //
+  // Remove all the "\..". E.g.: fs0:\abc\..\def\..
+  //
+  while (((TempString = StrStr(Path, L"\\..")) != NULL) &&
+         ((*(TempString + 3) == L'\\') || (*(TempString + 3) == CHAR_NULL))
+        ) {
+    *(TempString + 1) = CHAR_NULL;
+    PathRemoveLastItem(Path);
+    CopyMem (Path + StrLen (Path), TempString + 3, StrSize (TempString + 3));
+  }
+
+  //
+  // Replace the "\\" with "\"
+  //
+  while ((TempString = StrStr (Path, L"\\\\")) != NULL) {
+    CopyMem (TempString, TempString + 1, StrSize (TempString + 1));
+  }
+
+  return Path;
+}
+