diff --git a/coding/coding.pro b/coding/coding.pro
index 240b200e58..1b6eb763f6 100644
--- a/coding/coding.pro
+++ b/coding/coding.pro
@@ -75,4 +75,5 @@ HEADERS += \
     trie.hpp \
     trie_builder.hpp \
     trie_reader.hpp \
-		mmap_reader.hpp \
+    mmap_reader.hpp \
+    read_write_utils.hpp \
diff --git a/coding/file_container.cpp b/coding/file_container.cpp
index 2333047d25..32eb9d623b 100644
--- a/coding/file_container.cpp
+++ b/coding/file_container.cpp
@@ -1,11 +1,27 @@
 #include "../base/SRC_FIRST.hpp"
 
 #include "file_container.hpp"
-#include "varint.hpp"
+#include "read_write_utils.hpp"
 #include "write_to_sink.hpp"
 #include "internal/file_data.hpp"
 
 
+template <class TSource> void Read(TSource & src, FilesContainerBase::Info & i)
+{
+  rw::Read(src, i.m_tag);
+
+  i.m_offset = ReadVarUint<uint64_t>(src);
+  i.m_size = ReadVarUint<uint64_t>(src);
+}
+
+template <class TSink> void Write(TSink & sink, FilesContainerBase::Info const & i)
+{
+  rw::Write(sink, i.m_tag);
+
+  WriteVarUint(sink, i.m_offset);
+  WriteVarUint(sink, i.m_size);
+}
+
 /////////////////////////////////////////////////////////////////////////////
 // FilesContainerBase
 /////////////////////////////////////////////////////////////////////////////
@@ -18,18 +34,7 @@ void FilesContainerBase::ReadInfo(ReaderT & reader)
   ReaderSource<ReaderT> src(reader);
   src.Skip(offset);
 
-  uint32_t const count = ReadVarUint<uint32_t>(src);
-  m_info.resize(count);
-
-  for (uint32_t i = 0; i < count; ++i)
-  {
-    uint32_t const tagSize = ReadVarUint<uint32_t>(src);
-    m_info[i].m_tag.resize(tagSize);
-    src.Read(&m_info[i].m_tag[0], tagSize);
-
-    m_info[i].m_offset = ReadVarUint<uint64_t>(src);
-    m_info[i].m_size = ReadVarUint<uint64_t>(src);
-  }
+  rw::Read(src, m_info);
 }
 
 /////////////////////////////////////////////////////////////////////////////
@@ -233,18 +238,7 @@ void FilesContainerW::Finish()
 
   sort(m_info.begin(), m_info.end(), LessInfo());
 
-  uint32_t const count = m_info.size();
-  WriteVarUint(writer, count);
-
-  for (uint32_t i = 0; i < count; ++i)
-  {
-    size_t const tagSize = m_info[i].m_tag.size();
-    WriteVarUint(writer, tagSize);
-    writer.Write(&m_info[i].m_tag[0], tagSize);
-
-    WriteVarUint(writer, m_info[i].m_offset);
-    WriteVarUint(writer, m_info[i].m_size);
-  }
+  rw::Write(writer, m_info);
 
   m_bFinished = true;
 }
diff --git a/coding/file_container.hpp b/coding/file_container.hpp
index 8b8ec54465..d77e8587a4 100644
--- a/coding/file_container.hpp
+++ b/coding/file_container.hpp
@@ -7,8 +7,7 @@
 
 class FilesContainerBase
 {
-protected:
-
+public:
   typedef string Tag;
 
   struct Info
@@ -21,6 +20,7 @@ protected:
     Info(Tag const & tag, uint64_t offset) : m_tag(tag), m_offset(offset) {}
   };
 
+protected:
   struct LessInfo
   {
     bool operator() (Info const & t1, Info const & t2) const
diff --git a/coding/read_write_utils.hpp b/coding/read_write_utils.hpp
new file mode 100644
index 0000000000..fb961834f2
--- /dev/null
+++ b/coding/read_write_utils.hpp
@@ -0,0 +1,46 @@
+#pragma once
+
+#include "varint.hpp"
+
+#include "../std/string.hpp"
+#include "../std/vector.hpp"
+
+
+namespace rw
+{
+  template <class TSink>
+  void Write(TSink & sink, string const & s)
+  {
+    uint32_t const count = static_cast<uint32_t>(s.size());
+    WriteVarUint(sink, count);
+    if (!s.empty())
+      sink.Write(&s[0], count);
+  }
+
+  template <class TSource>
+  void Read(TSource & src, string & s)
+  {
+    uint32_t const count = ReadVarUint<uint32_t>(src);
+    s.resize(count);
+    if (count > 0)
+      src.Read(&s[0], count);
+  }
+
+  template <class TSink, class T>
+  void Write(TSink & sink, vector<T> const & v)
+  {
+    uint32_t const count = static_cast<uint32_t>(v.size());
+    WriteVarUint(sink, count);
+    for (uint32_t i = 0; i < count; ++i)
+      Write(sink, v[i]);
+  }
+
+  template <class TSource, class T>
+  void Read(TSource & src, vector<T> & v)
+  {
+    uint32_t const count = ReadVarUint<uint32_t>(src);
+    v.resize(count);
+    for (size_t i = 0; i < count; ++i)
+      Read(src, v[i]);
+  }
+}