Encoding: Fix potential encoding issues with libarchive on Windows.

Because the 8bit string encoding in libarchive can be different than
the 8bit string encoding in CMake, change to call the wide version
of libarchive functions.  They are different if CMake is configured
to use UTF-8 as the internal encoding.

Create helper functions for some libarchive calls to use wstring
internally on platforms supporting it.

Source/cmArchiveWrite.cxx

@@ -24,6 +24,28 @@ static std::string cm_archive_error_string(struct archive* a)
   return e? e : "unknown error";
 }
 
+//----------------------------------------------------------------------------
+static void cm_archive_entry_copy_pathname(struct archive_entry* e,
+  const std::string& dest)
+{
+#if cmsys_STL_HAS_WSTRING
+  archive_entry_copy_pathname_w(e, cmsys::Encoding::ToWide(dest).c_str());
+#else
+  archive_entry_copy_pathname(e, dest.c_str());
+#endif
+}
+
+//----------------------------------------------------------------------------
+static void cm_archive_entry_copy_sourcepath(struct archive_entry* e,
+  const std::string& file)
+{
+#if cmsys_STL_HAS_WSTRING
+  archive_entry_copy_sourcepath_w(e, cmsys::Encoding::ToWide(file).c_str());
+#else
+  archive_entry_copy_sourcepath(e, file.c_str());
+#endif
+}
+
 //----------------------------------------------------------------------------
 class cmArchiveWrite::Entry
 {
@@ -237,8 +259,8 @@ bool cmArchiveWrite::AddFile(const char* file,
     std::cout << dest << "\n";
     }
   Entry e;
-  archive_entry_copy_sourcepath(e, file);
+  cm_archive_entry_copy_sourcepath(e, file);
-  archive_entry_set_pathname(e, dest.c_str());
+  cm_archive_entry_copy_pathname(e, dest);
   if(archive_read_disk_entry_from_file(this->Disk, e, -1, 0) != ARCHIVE_OK)
     {
     this->Error = "archive_read_disk_entry_from_file: ";

Source/cmSystemTools.cxx

@@ -91,6 +91,31 @@ extern char** environ;
 # endif
 #endif
 
+#if defined(CMAKE_BUILD_WITH_CMAKE)
+static std::string
+cm_archive_entry_pathname(struct archive_entry *entry)
+{
+#if cmsys_STL_HAS_WSTRING
+  return cmsys::Encoding::ToNarrow(
+    archive_entry_pathname_w(entry)).c_str();
+#else
+  return archive_entry_pathname(entry);
+#endif
+}
+
+static int cm_archive_read_open_file(struct archive* a,
+                                     const char* file,
+                                     int block_size)
+{
+#if cmsys_STL_HAS_WSTRING
+  std::wstring wfile = cmsys::Encoding::ToWide(file);
+  return archive_read_open_filename_w(a, wfile.c_str(), block_size);
+#else
+  return archive_read_open_filename(a, file, block_size);
+#endif
+}
+#endif
+
 #ifdef _WIN32
 class cmSystemToolsWindowsHandle
 {
@@ -1581,7 +1606,7 @@ namespace{
     }
   strftime(tmp, sizeof(tmp), fmt, localtime(&tim));
   fprintf(out, " %s ", tmp);
-  fprintf(out, "%s", archive_entry_pathname(entry));
+  fprintf(out, "%s", cm_archive_entry_pathname(entry).c_str());
 
   /* Extra information for links. */
   if (archive_entry_hardlink(entry)) /* Hard link */
@@ -1641,7 +1666,7 @@ bool extract_tar(const char* outFileName, bool verbose,
   archive_read_support_compression_all(a);
   archive_read_support_format_all(a);
   struct archive_entry *entry;
-  int r = archive_read_open_file(a, outFileName, 10240);
+  int r = cm_archive_read_open_file(a, outFileName, 10240);
   if(r)
     {
     cmSystemTools::Error("Problem with archive_read_open_file(): ",
@@ -1666,7 +1691,7 @@ bool extract_tar(const char* outFileName, bool verbose,
       if(extract)
         {
         cmSystemTools::Stdout("x ");
-        cmSystemTools::Stdout(archive_entry_pathname(entry));
+        cmSystemTools::Stdout(cm_archive_entry_pathname(entry).c_str());
         }
       else
         {
@@ -1676,7 +1701,7 @@ bool extract_tar(const char* outFileName, bool verbose,
       }
     else if(!extract)
       {
-      cmSystemTools::Stdout(archive_entry_pathname(entry));
+      cmSystemTools::Stdout(cm_archive_entry_pathname(entry).c_str());
       cmSystemTools::Stdout("\n");
       }
     if(extract)
@@ -1706,7 +1731,8 @@ bool extract_tar(const char* outFileName, bool verbose,
       else if(const char* linktext = archive_entry_symlink(entry))
         {
         std::cerr << "cmake -E tar: warning: skipping symbolic link \""
-                  << archive_entry_pathname(entry) << "\" -> \""
+                  << cm_archive_entry_pathname(entry)
+                  << "\" -> \""
                   << linktext << "\"." << std::endl;
         }
 #endif
@@ -1715,7 +1741,7 @@ bool extract_tar(const char* outFileName, bool verbose,
         cmSystemTools::Error("Problem with archive_write_header(): ",
                              archive_error_string(ext));
         cmSystemTools::Error("Current file: ",
-                             archive_entry_pathname(entry));
+                             cm_archive_entry_pathname(entry).c_str());
         break;
         }
       }