Merge pull request #31 from sandsmark/master

Allow people to get the position in the underlying stream

README.org

@@ -18,10 +18,12 @@ Alternatives to this library include:
 
 - The [[http://www.boost.org/doc/libs/release/libs/iostreams/][Boost IOStreams]] library. The library does not auto-detect input compression (by default, though that can be easily implemented with filters), and more importantly, it is not a header-only Boost library.
 
-- The [[https://github.com/tmaklin/bxzstr][bxzstr]] library.
+- The [[https://github.com/tmaklin/bxzstr][bxzstr]] library, if you want support for BZ2 and/or LZMA as well.
 
 For an example usage, see [[examples/ztxtpipe.cpp]] and [[examples/zc.cpp]].
 
+It is compatible with [[https://github.com/richgel999/miniz][miniz]] in case you don't want to get frustrated with zlib e. g. on Windows.
+
 **** Input Auto-detection
 
 For input access, the library seamlessly auto-detects whether the source stream is compressed or not. The following compressed streams are detected:

src/zstr.hpp

@@ -441,6 +441,12 @@ class ifstream
     {
         if (rdbuf()) delete rdbuf();
     }
+
+    /// Return the position within the compressed file (wrapped filestream)
+    std::streampos compressed_tellg()
+    {
+        return _fs.tellg();
+    }
 }; // class ifstream
 
 class ofstream
@@ -477,6 +483,12 @@ class ofstream
     {
         if (rdbuf()) delete rdbuf();
     }
+
+    // Return the position within the compressed file (wrapped filestream)
+    std::streampos compressed_tellp()
+    {
+        return _fs.tellp();
+    }
 }; // class ofstream
 
 } // namespace zstr