Initial work on patch list

arm7/source/loader/PatchList.cpp

@@ -0,0 +1,32 @@
+#include "common.h"
+#include <algorithm>
+#include "PatchList.h"
+
+const PatchListEntry* PatchList::FindEntry(u32 gameCode, u8 gameVersion)
+{
+    auto header = reinterpret_cast<const PatchListHeader*>(_fileContents.get());
+    u32 count = header->entryCount;
+    auto entries = header->headerEntries;
+    if (count != 0)
+    {
+        const auto gameEntry = std::lower_bound(entries, entries + count, gameCode,
+            [gameVersion] (const PatchListHeaderEntry& entry, u32 value)
+            {
+                if (entry.gameCode == value)
+                {
+                    return entry.gameVersion < gameVersion;
+                }
+                else
+                {
+                    return entry.gameCode < value;
+                }
+            });
+
+        if (gameEntry != entries + count && gameEntry->gameCode == gameCode && gameEntry->gameVersion == gameVersion)
+        {
+            return reinterpret_cast<const PatchListEntry*>(_fileContents.get() + gameEntry->offset);
+        }
+    }
+
+    return nullptr;
+}