Rearrange project files.

include/internal/vase/buffer/append.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "../constants.h"
+#include "buffer.h"
+#include "pch.h"
+
+struct AppendBuffer : Buffer {
+  char *buf = nullptr;
+  uint64_t allocated_capacity = 0;
+  uint64_t current_size = 0;
+  int fd = -1;
+
+  AppendBuffer(std::filesystem::path base_dir);
+  ~AppendBuffer();
+
+  uint64_t append(const char c);
+  uint64_t append(const char *text, uint64_t len);
+  const char *read(uint64_t pos) override;
+  uint64_t length() override;
+
+private:
+  void grow(uint64_t len);
+};

include/internal/vase/buffer/buffer.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "pch.h"
+
+struct Buffer {
+  virtual const char *read(uint64_t pos) = 0;
+  virtual uint64_t length() = 0;
+  virtual ~Buffer() = default;
+};

include/internal/vase/buffer/original.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "buffer.h"
+#include "pch.h"
+
+struct OriginalBuffer : Buffer {
+  const char *buf;
+  uint64_t len;
+  int fd = -1;
+
+  OriginalBuffer(std::filesystem::path base_dir);
+  ~OriginalBuffer();
+
+  void initialize();
+  const char *read(uint64_t pos) override;
+  uint64_t length() override;
+};