From 86f6b6b7b2d930e8203114332b04a5c49a780b06 Mon Sep 17 00:00:00 2001
From: Liam <byteslice@airmail.cc>
Date: Thu, 10 Aug 2023 21:34:43 -0400
Subject: vfs: expand support for NCA reading

---
 .../file_sys/fssystem/fssystem_bucket_tree_utils.h | 110 +++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 src/core/file_sys/fssystem/fssystem_bucket_tree_utils.h

(limited to 'src/core/file_sys/fssystem/fssystem_bucket_tree_utils.h')

diff --git a/src/core/file_sys/fssystem/fssystem_bucket_tree_utils.h b/src/core/file_sys/fssystem/fssystem_bucket_tree_utils.h
new file mode 100644
index 000000000..5503613fc
--- /dev/null
+++ b/src/core/file_sys/fssystem/fssystem_bucket_tree_utils.h
@@ -0,0 +1,110 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/file_sys/fssystem/fssystem_bucket_tree.h"
+
+namespace FileSys::impl {
+
+class SafeValue {
+public:
+    static s64 GetInt64(const void* ptr) {
+        s64 value;
+        std::memcpy(std::addressof(value), ptr, sizeof(s64));
+        return value;
+    }
+
+    static s64 GetInt64(const s64* ptr) {
+        return GetInt64(static_cast<const void*>(ptr));
+    }
+
+    static s64 GetInt64(const s64& v) {
+        return GetInt64(std::addressof(v));
+    }
+
+    static void SetInt64(void* dst, const void* src) {
+        std::memcpy(dst, src, sizeof(s64));
+    }
+
+    static void SetInt64(void* dst, const s64* src) {
+        return SetInt64(dst, static_cast<const void*>(src));
+    }
+
+    static void SetInt64(void* dst, const s64& v) {
+        return SetInt64(dst, std::addressof(v));
+    }
+};
+
+template <typename IteratorType>
+struct BucketTreeNode {
+    using Header = BucketTree::NodeHeader;
+
+    Header header;
+
+    s32 GetCount() const {
+        return this->header.count;
+    }
+
+    void* GetArray() {
+        return std::addressof(this->header) + 1;
+    }
+    template <typename T>
+    T* GetArray() {
+        return reinterpret_cast<T*>(this->GetArray());
+    }
+    const void* GetArray() const {
+        return std::addressof(this->header) + 1;
+    }
+    template <typename T>
+    const T* GetArray() const {
+        return reinterpret_cast<const T*>(this->GetArray());
+    }
+
+    s64 GetBeginOffset() const {
+        return *this->GetArray<s64>();
+    }
+    s64 GetEndOffset() const {
+        return this->header.offset;
+    }
+
+    IteratorType GetBegin() {
+        return IteratorType(this->GetArray<s64>());
+    }
+    IteratorType GetEnd() {
+        return IteratorType(this->GetArray<s64>()) + this->header.count;
+    }
+    IteratorType GetBegin() const {
+        return IteratorType(this->GetArray<s64>());
+    }
+    IteratorType GetEnd() const {
+        return IteratorType(this->GetArray<s64>()) + this->header.count;
+    }
+
+    IteratorType GetBegin(size_t entry_size) {
+        return IteratorType(this->GetArray(), entry_size);
+    }
+    IteratorType GetEnd(size_t entry_size) {
+        return IteratorType(this->GetArray(), entry_size) + this->header.count;
+    }
+    IteratorType GetBegin(size_t entry_size) const {
+        return IteratorType(this->GetArray(), entry_size);
+    }
+    IteratorType GetEnd(size_t entry_size) const {
+        return IteratorType(this->GetArray(), entry_size) + this->header.count;
+    }
+};
+
+constexpr inline s64 GetBucketTreeEntryOffset(s64 entry_set_offset, size_t entry_size,
+                                              s32 entry_index) {
+    return entry_set_offset + sizeof(BucketTree::NodeHeader) +
+           entry_index * static_cast<s64>(entry_size);
+}
+
+constexpr inline s64 GetBucketTreeEntryOffset(s32 entry_set_index, size_t node_size,
+                                              size_t entry_size, s32 entry_index) {
+    return GetBucketTreeEntryOffset(entry_set_index * static_cast<s64>(node_size), entry_size,
+                                    entry_index);
+}
+
+} // namespace FileSys::impl
-- 
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