1 files changed, 45 insertions, 0 deletions
diff --git a/create.h b/create.h
new file mode 100644
index 0000000..b536f3e
--- /dev/null
+++ b/create.h
@@ -0,0 +1,45 @@
+/* Tarlz - Archiver with multimember lzip compression
+   Copyright (C) 2013-2021 Antonio Diaz Diaz.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+class Archive_attrs
+  {
+  struct stat ast;		// archive attributes at time of init
+  bool initialized;
+  bool isreg;
+
+public:
+  Archive_attrs() : initialized( false ), isreg( false ) {}
+  bool init( const int fd )
+    {
+    if( fstat( fd, &ast ) != 0 ) return false;
+    if( S_ISREG( ast.st_mode ) ) isreg = true;
+    initialized = true;
+    return true;
+    }
+  bool is_the_archive( const struct stat & st ) const
+    { return isreg && st.st_dev == ast.st_dev && st.st_ino == ast.st_ino; }
+  bool is_newer( const struct stat & st ) const
+    { return initialized && st.st_mtime > ast.st_mtime; }
+  bool is_newer( const char * const filename ) const
+    {
+    if( !initialized ) return false;
+    struct stat st;
+    return lstat( filename, &st ) != 0 || st.st_mtime > ast.st_mtime;
+    }
+  };
+
+extern Archive_attrs archive_attrs;