[Glacier] Add buffer types for holding bytes and capabilities.

lib/glacier/buffer/byte_buffer.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <stdint.h>
+
+#include "glacier/string/string.h"
+
+namespace glcr {
+
+class ByteBuffer {
+ public:
+  ByteBuffer(uint64_t size) : buffer_(new uint8_t[size]) {}
+  ByteBuffer(const ByteBuffer&) = delete;
+  ByteBuffer(ByteBuffer&&) = delete;
+
+  ~ByteBuffer() { delete[] buffer_; }
+
+  template <typename T>
+  void WriteAt(uint64_t offset, const T& object) {
+    // FIXME: Add bounds check here.
+    *reinterpret_cast<T*>(buffer_ + offset) = object;
+  }
+
+  void WriteStringAt(uint64_t offset, const String& string) {
+    for (uint64_t i = 0; i < string.length(); i++) {
+      buffer_[offset + i] = string[i];
+    }
+  }
+
+  template <typename T>
+  const T& At(uint64_t offset) const {
+    return *reinterpret_cast<T*>(buffer_ + offset);
+  }
+
+  String StringAt(uint64_t offset, uint64_t length) const {
+    return String(reinterpret_cast<char*>(buffer_ + offset), length);
+  }
+
+  // private:
+  uint8_t* buffer_;
+};
+
+}  // namespace glcr