Implement File API

include/AdblockPlus/FileSystem.h

 #ifndef ADBLOCKPLUS_FILE_SYSTEM_H
 #define ADBLOCKPLUS_FILE_SYSTEM_H
 
 #include <istream>
 #include <string>
-#include <memory>
+
+#include "tr1_memory.h"
 
 namespace AdblockPlus
 {
   class FileSystem
   {
   public:
     struct StatResult
     {
       bool exists;
       bool isDirectory;
       bool isFile;
       int64_t lastModified;
     };
 
     virtual ~FileSystem() {}
-    virtual std::auto_ptr<std::istream> Read(const std::string& path) const = 0;
-    virtual void Write(const std::string& path, const std::string& content) = 0;
+    virtual std::tr1::shared_ptr<std::istream>
+      Read(const std::string& path) const = 0;
+    virtual void Write(const std::string& path,
+                       std::tr1::shared_ptr<std::ostream> data) = 0;
     virtual void Move(const std::string& fromPath,
                       const std::string& toPath) = 0;
     virtual void Remove(const std::string& path) = 0;
     virtual StatResult Stat(const std::string& path) const = 0;
   };
 }
 
 #endif