From 16ff70613a95d7f85f4cab09f2b3316f67e5901b Mon Sep 17 00:00:00 2001
From: Jan Sucan <jan@jansucan.com>
Date: Sun, 14 Apr 2024 11:51:34 +0200
Subject: Move input and output buffering to classes

---
 src/buffered_file.h | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 src/buffered_file.h

(limited to 'src/buffered_file.h')

diff --git a/src/buffered_file.h b/src/buffered_file.h
new file mode 100644
index 0000000..1bcbb73
--- /dev/null
+++ b/src/buffered_file.h
@@ -0,0 +1,81 @@
+/* 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>
+
+class BufferedFileError : public DiffddError
+{
+  public:
+    explicit BufferedFileError(const std::string &message)
+        : DiffddError(message)
+    {
+    }
+};
+
+class BufferedFileReader
+{
+  public:
+    BufferedFileReader(std::filesystem::path path, size_t buffer_capacity);
+    virtual ~BufferedFileReader() = default;
+
+    size_t read(char *data, size_t data_size);
+
+  private:
+    std::ifstream m_file;
+    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(char *data, size_t data_size);
+    void refill_buffer();
+    size_t read_file(char *data, size_t data_size);
+};
+
+class BufferedFileWriter
+{
+  public:
+    BufferedFileWriter(std::filesystem::path path, size_t buffer_capacity);
+    virtual ~BufferedFileWriter();
+
+    void write(const char *data, size_t data_size);
+
+  private:
+    std::fstream m_file;
+    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_file(const char *data, size_t data_size);
+};
-- 
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