Libraries: Add LibPCIDB for reading PCI device information from pci.ids

Libraries/LibPCIDB/Database.h

@@ -0,0 +1,78 @@
+#pragma once
+
+#include <AK/HashMap.h>
+#include <AK/MappedFile.h>
+#include <AK/NonnullOwnPtr.h>
+#include <AK/RefCounted.h>
+#include <AK/RefPtr.h>
+#include <AK/StringView.h>
+
+namespace PCIDB {
+
+struct Subsystem {
+    u16 vendor_id;
+    u16 device_id;
+    StringView name;
+};
+
+struct Device {
+    u16 id;
+    StringView name;
+    HashMap<int, NonnullOwnPtr<Subsystem>> subsystems;
+};
+
+struct Vendor {
+    u16 id;
+    StringView name;
+    HashMap<int, NonnullOwnPtr<Device>> devices;
+};
+
+struct ProgrammingInterface {
+    u8 id { 0 };
+    StringView name {};
+};
+
+struct Subclass {
+    u8 id { 0 };
+    StringView name {};
+    HashMap<int, NonnullOwnPtr<ProgrammingInterface>> programming_interfaces;
+};
+
+struct Class {
+    u8 id { 0 };
+    StringView name {};
+    HashMap<int, NonnullOwnPtr<Subclass>> subclasses;
+};
+
+class Database : public RefCounted<Database> {
+public:
+    static RefPtr<Database> open(const StringView& file_name);
+    static RefPtr<Database> open() { return open("/res/pci.ids"); };
+
+    const StringView get_vendor(u16 vendor_id) const;
+    const StringView get_device(u16 vendor_id, u16 device_id) const;
+    const StringView get_subsystem(u16 vendor_id, u16 device_id, u16 subvendor_id, u16 subdevice_id) const;
+    const StringView get_class(u8 class_id) const;
+    const StringView get_subclass(u8 class_id, u8 subclass_id) const;
+    const StringView get_programming_interface(u8 class_id, u8 subclass_id, u8 programming_interface_id) const;
+
+private:
+    Database(const StringView& file_name)
+        : m_file(file_name) {};
+
+    int init();
+
+    enum ParseMode {
+        UnknownMode,
+        VendorMode,
+        ClassMode,
+    };
+
+    MappedFile m_file {};
+    StringView m_view {};
+    HashMap<int, NonnullOwnPtr<Vendor>> m_vendors;
+    HashMap<int, NonnullOwnPtr<Class>> m_classes;
+    bool m_ready { false };
+};
+
+}