Start CMake modernization scaffold

src/foundation/binary_stream.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include "foundation/result.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <span>
+#include <vector>
+
+namespace pp::foundation {
+
+class ByteReader {
+public:
+    explicit ByteReader(std::span<const std::byte> bytes) noexcept;
+
+    [[nodiscard]] std::size_t position() const noexcept;
+    [[nodiscard]] std::size_t size() const noexcept;
+    [[nodiscard]] std::size_t remaining() const noexcept;
+    [[nodiscard]] bool empty() const noexcept;
+
+    [[nodiscard]] Status seek(std::size_t position) noexcept;
+    [[nodiscard]] Result<std::uint8_t> read_u8() noexcept;
+    [[nodiscard]] Result<std::uint16_t> read_u16_le() noexcept;
+    [[nodiscard]] Result<std::uint32_t> read_u32_le() noexcept;
+    [[nodiscard]] Result<std::span<const std::byte>> read_bytes(std::size_t count) noexcept;
+
+private:
+    std::span<const std::byte> bytes_;
+    std::size_t position_ = 0;
+};
+
+class ByteWriter {
+public:
+    explicit ByteWriter(std::vector<std::byte>& bytes) noexcept;
+
+    [[nodiscard]] std::size_t size() const noexcept;
+    [[nodiscard]] Status write_u8(std::uint8_t value);
+    [[nodiscard]] Status write_u16_le(std::uint16_t value);
+    [[nodiscard]] Status write_u32_le(std::uint32_t value);
+    [[nodiscard]] Status write_bytes(std::span<const std::byte> bytes);
+
+private:
+    std::vector<std::byte>* bytes_ = nullptr;
+};
+
+}