add output versions of deflate and memory streams

src/io/memory_istream.hpp

@@ -3,32 +3,32 @@
 #include <istream>
 #include "util/Buffer.hpp"
 
+class memory_streambuf : public std::streambuf {
+public:
+    explicit memory_streambuf(util::Buffer<char> buffer)
+        : buffer(std::move(buffer)) {
+        char* base = this->buffer.data();
+        char* end = base + this->buffer.size();
+        setg(base, base, end);
+    }
+    
+    memory_streambuf(const memory_streambuf&) = delete;
+    memory_streambuf& operator=(const memory_streambuf&) = delete;
+
+protected:
+    int_type underflow() override {
+        return traits_type::eof();
+    }
+
+private:
+    util::Buffer<char> buffer;
+};
+
 class memory_istream : public std::istream {
 public:
     explicit memory_istream(util::Buffer<char> buffer)
         : std::istream(&buf), buf(std::move(buffer)) {}
 
 private:
-    class memory_streambuf : public std::streambuf {
-    public:
-        explicit memory_streambuf(util::Buffer<char> buffer)
-            : buffer(std::move(buffer)) {
-            char* base = this->buffer.data();
-            char* end = base + this->buffer.size();
-            setg(base, base, end);
-        }
-        
-        memory_streambuf(const memory_streambuf&) = delete;
-        memory_streambuf& operator=(const memory_streambuf&) = delete;
-    
-    protected:
-        int_type underflow() override {
-            return traits_type::eof();
-        }
-    
-    private:
-        util::Buffer<char> buffer;
-    };
-    
     memory_streambuf buf;
 };