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Launcher/WiiCompiled.Setup.Windows/InstallerEngine.cs

@@ -501,17 +501,31 @@ internal sealed class InstallerEngine
         var dol = Path.Combine(dataRoot, "sys", "main.dol");
         var rel = Path.Combine(dataRoot, "files", "rel", "StaticR.rel");
         var fst = Path.Combine(dataRoot, "sys", "fst.bin");
-        if (!File.Exists(dol) || !File.Exists(rel) || !File.Exists(fst))
-            throw new InvalidDataException("The disc extraction is missing required Mario Kart Wii files.");
-        var dolHash = InputValidation.Sha256File(dol);
-        var relHash = InputValidation.Sha256File(rel);
-        if (!dolHash.Equals(manifest.ExpectedDolSha256, StringComparison.OrdinalIgnoreCase) ||
-            !relHash.Equals(manifest.ExpectedRelSha256, StringComparison.OrdinalIgnoreCase))
-        {
+        var missing = new[] { dol, rel, fst }.Where(path => !File.Exists(path))
+            .Select(path => Path.GetRelativePath(dataRoot, path)).ToList();
+        if (missing.Count > 0)
             throw new InvalidDataException(
-                "The disc is RMCP01 but does not match the supported clean PAL revision. " +
-                "Patched or otherwise modified game code cannot be installed safely.");
+                "The disc extraction is missing required Mario Kart Wii files: " +
+                string.Join(", ", missing) + ".");
+
+        var mismatches = new List<string>();
+        foreach (var (name, path, expected) in new[]
+                 {
+                     ("main.dol", dol, manifest.ExpectedDolSha256),
+                     ("StaticR.rel", rel, manifest.ExpectedRelSha256)
+                 })
+        {
+            var actual = InputValidation.Sha256File(path);
+            if (!actual.Equals(expected, StringComparison.OrdinalIgnoreCase))
+                mismatches.Add($"{name} is {new FileInfo(path).Length:N0} bytes with SHA-256 {actual} " +
+                               $"(expected {expected})");
         }
+
+        if (mismatches.Count > 0)
+            throw new InvalidDataException(
+                "The disc is RMCP01 but its game code does not match the supported clean PAL revision: " +
+                string.Join("; ", mismatches) + ". " +
+                "Patched or otherwise modified game code cannot be installed safely.");
     }
 
     private static void ValidateInstallDirectory(string path) =>

Launcher/macos/extract-disc.command

@@ -51,8 +51,10 @@ dol=$(find "$scratch/extracted" -type f -path '*/sys/main.dol' -print -quit)
 rel=$(find "$scratch/extracted" -type f -path '*/files/rel/StaticR.rel' -print -quit)
 [[ -n "$dol" ]] || fail 'nodtool extraction did not contain sys/main.dol'
 [[ -n "$rel" ]] || fail 'nodtool extraction did not contain files/rel/StaticR.rel'
-[[ $(sha256 "$dol") == "$EXPECTED_DOL_SHA256" ]] || fail 'disc is not the supported clean PAL RMCP01 Mario Kart Wii image'
-[[ $(sha256 "$rel") == "$EXPECTED_REL_SHA256" ]] || fail 'disc has an unexpected StaticR.rel; use a clean PAL RMCP01 image'
+dol_sha=$(sha256 "$dol")
+rel_sha=$(sha256 "$rel")
+[[ $dol_sha == "$EXPECTED_DOL_SHA256" ]] || fail "main.dol does not match the clean PAL RMCP01 image (expected $EXPECTED_DOL_SHA256, got $dol_sha)"
+[[ $rel_sha == "$EXPECTED_REL_SHA256" ]] || fail "StaticR.rel does not match the clean PAL RMCP01 image (expected $EXPECTED_REL_SHA256, got $rel_sha)"
 
 data_root=$(dirname "$(dirname "$dol")")
 [[ -d "$data_root/files" ]] || fail 'nodtool extraction did not contain the Wii files directory'

runtime/src/ppc_helpers.cpp

@@ -12,6 +12,7 @@
 #include <cmath>
 #include <cstdint>
 #include <cstdlib>
+#include <ctime>
 #include <stdexcept>
 #include <limits>
 
@@ -44,11 +45,48 @@ uint32_t g_reservationAddr = 0;
 bool g_hasReservation = false;
 const auto g_timeBaseStart = std::chrono::steady_clock::now();
 
+// Days from 1970-01-01 to the given civil date (Howard Hinnant's algorithm).
+constexpr int64_t DaysFromCivil(int64_t y, unsigned m, unsigned d)
+{
+    y -= m <= 2;
+    const int64_t era = (y >= 0 ? y : y - 399) / 400;
+    const unsigned yoe = static_cast<unsigned>(y - era * 400);
+    const unsigned doy = (153 * (m > 2 ? m - 3 : m + 9) + 2) / 5 + d - 1;
+    const unsigned doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
+    return era * 146097 + static_cast<int64_t>(doe) - 719468;
+}
+
+// The Wii RTC holds local time; the OS counts ticks from 2000-01-01.
+uint64_t InitialTimeBase()
+{
+    const std::time_t now = std::time(nullptr);
+    std::tm local{};
+#if defined(_WIN32)
+    if (localtime_s(&local, &now) != 0) {
+        return 0;
+    }
+#else
+    if (localtime_r(&now, &local) == nullptr) {
+        return 0;
+    }
+#endif
+    const int64_t days = DaysFromCivil(local.tm_year + 1900, static_cast<unsigned>(local.tm_mon + 1),
+                                       static_cast<unsigned>(local.tm_mday)) -
+                         DaysFromCivil(2000, 1, 1);
+    const int64_t seconds = days * 86400 + local.tm_hour * 3600 + local.tm_min * 60 + local.tm_sec;
+    if (seconds <= 0) {
+        return 0;
+    }
+    return static_cast<uint64_t>(seconds) * TimeBaseContract::kTicksPerSecond;
+}
+
+const uint64_t g_timeBaseOrigin = InitialTimeBase();
+
 uint64_t GetTimeBase() {
     const auto elapsed = std::chrono::steady_clock::now() - g_timeBaseStart;
     const auto nanoseconds =
         std::chrono::duration_cast<std::chrono::nanoseconds>(elapsed).count();
-    return TimeBaseContract::NanosecondsToTicks(static_cast<uint64_t>(nanoseconds));
+    return g_timeBaseOrigin + TimeBaseContract::NanosecondsToTicks(static_cast<uint64_t>(nanoseconds));
 }
 
 constexpr uint32_t kFpscrFx = 1u << 31;