Merge pull request #11284 from liamwhite/nca-release

vfs: expand support for NCA reading

1 files changed, 33 insertions, 4 deletions

diff --git a/src/common/alignment.h b/src/common/alignment.h
index fa715d497..fc5c26898 100644
--- a/src/common/alignment.h
+++ b/src/common/alignment.h
@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <bit>
 #include <cstddef>
 #include <new>
 #include <type_traits>
@@ -10,8 +11,10 @@
 namespace Common {
 
 template <typename T>
-    requires std::is_unsigned_v<T>
-[[nodiscard]] constexpr T AlignUp(T value, size_t size) {
+    requires std::is_integral_v<T>
+[[nodiscard]] constexpr T AlignUp(T value_, size_t size) {
+    using U = typename std::make_unsigned_t<T>;
+    auto value{static_cast<U>(value_)};
     auto mod{static_cast<T>(value % size)};
     value -= mod;
     return static_cast<T>(mod == T{0} ? value : value + size);
@@ -24,8 +27,10 @@ template <typename T>
 }
 
 template <typename T>
-    requires std::is_unsigned_v<T>
-[[nodiscard]] constexpr T AlignDown(T value, size_t size) {
+    requires std::is_integral_v<T>
+[[nodiscard]] constexpr T AlignDown(T value_, size_t size) {
+    using U = typename std::make_unsigned_t<T>;
+    const auto value{static_cast<U>(value_)};
     return static_cast<T>(value - value % size);
 }
 
@@ -55,6 +60,30 @@ template <typename T, typename U>
     return (x + (y - 1)) / y;
 }
 
+template <typename T>
+    requires std::is_integral_v<T>
+[[nodiscard]] constexpr T LeastSignificantOneBit(T x) {
+    return x & ~(x - 1);
+}
+
+template <typename T>
+    requires std::is_integral_v<T>
+[[nodiscard]] constexpr T ResetLeastSignificantOneBit(T x) {
+    return x & (x - 1);
+}
+
+template <typename T>
+    requires std::is_integral_v<T>
+[[nodiscard]] constexpr bool IsPowerOfTwo(T x) {
+    return x > 0 && ResetLeastSignificantOneBit(x) == 0;
+}
+
+template <typename T>
+    requires std::is_integral_v<T>
+[[nodiscard]] constexpr T FloorPowerOfTwo(T x) {
+    return T{1} << (sizeof(T) * 8 - std::countl_zero(x) - 1);
+}
+
 template <typename T, size_t Align = 16>
 class AlignmentAllocator {
 public: