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diff --git a/src/buffered_stream.h b/src/buffered_stream.h
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+/* Copyright 2024 Ján Sučan <jan@jansucan.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "exception.h"
+
+#include <cstring>
+#include <filesystem>
+#include <fstream>
+
+namespace BufferedStream
+{
+
+class Error : public DiffddError
+{
+  public:
+    explicit Error(const std::string &message) : DiffddError(message) {}
+};
+
+class Reader
+{
+  public:
+    Reader(std::istream &istream, size_t buffer_capacity);
+    virtual ~Reader() = default;
+
+    size_t read(char *data, size_t data_size);
+    size_t tryRead(size_t data_size, char **return_data);
+
+  private:
+    std::istream &m_istream;
+    std::unique_ptr<char[]> m_buffer;
+    size_t m_buffer_offset;
+    size_t m_buffer_size;
+    const size_t m_buffer_capacity;
+
+    size_t read_buffer(size_t data_size, char **return_data);
+    void refill_buffer();
+    size_t read_stream(char *data, size_t data_size);
+};
+
+class Writer
+{
+  public:
+    Writer(std::ostream &ostream, size_t buffer_capacity);
+    virtual ~Writer();
+
+    void write(const char *data, size_t data_size);
+
+  private:
+    std::ostream &m_ostream;
+    std::unique_ptr<char[]> m_buffer;
+    size_t m_buffer_size;
+    const size_t m_buffer_capacity;
+
+    void write_buffer(const char *data, size_t data_size);
+    void flush_buffer();
+    void write_stream(const char *data, size_t data_size);
+};
+
+} // namespace BufferedStream