1 files changed, 47 insertions, 0 deletions

diff --git a/src/audio_core/common.h b/src/audio_core/common.h
new file mode 100644
index 000000000..98478b66b
--- /dev/null
+++ b/src/audio_core/common.h
@@ -0,0 +1,47 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+#include "common/swap.h"
+#include "core/hle/result.h"
+
+namespace AudioCore {
+namespace Audren {
+constexpr ResultCode ERR_INVALID_PARAMETERS{ErrorModule::Audio, 41};
+}
+
+constexpr u32_le CURRENT_PROCESS_REVISION = Common::MakeMagic('R', 'E', 'V', '8');
+
+static constexpr u32 VersionFromRevision(u32_le rev) {
+    // "REV7" -> 7
+    return ((rev >> 24) & 0xff) - 0x30;
+}
+
+static constexpr bool IsRevisionSupported(u32 required, u32_le user_revision) {
+    const auto base = VersionFromRevision(user_revision);
+    return required <= base;
+}
+
+static constexpr bool IsValidRevision(u32_le revision) {
+    const auto base = VersionFromRevision(revision);
+    constexpr auto max_rev = VersionFromRevision(CURRENT_PROCESS_REVISION);
+    return base <= max_rev;
+}
+
+static constexpr bool CanConsumeBuffer(std::size_t size, std::size_t offset, std::size_t required) {
+    if (offset > size) {
+        return false;
+    }
+    if (size < required) {
+        return false;
+    }
+    if ((size - offset) < required) {
+        return false;
+    }
+    return true;
+}
+
+} // namespace AudioCore