Add PPI header recognition tests

src/assets/ppi_header.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include "foundation/result.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <span>
+
+namespace pp::assets {
+
+constexpr std::size_t ppi_header_size = 40;
+
+struct PpiVersion {
+    std::uint32_t major = 0;
+    std::uint32_t minor = 0;
+};
+
+struct PpiSoftwareVersion {
+    std::uint32_t major = 0;
+    std::uint32_t minor = 0;
+    std::uint32_t fix = 0;
+    std::uint32_t build = 0;
+};
+
+struct PpiThumbnailInfo {
+    std::uint32_t width = 0;
+    std::uint32_t height = 0;
+    std::uint32_t components = 0;
+};
+
+struct PpiHeaderInfo {
+    PpiVersion document_version;
+    PpiSoftwareVersion software_version;
+    PpiThumbnailInfo thumbnail;
+};
+
+[[nodiscard]] pp::foundation::Result<PpiHeaderInfo> parse_ppi_header(
+    std::span<const std::byte> bytes) noexcept;
+
+}