use 2mb pages

Signed-off-by: Caio Oliveira <caiooliveirafarias0@gmail.com>

cpmfile.json

@@ -201,7 +201,7 @@
         "name": "openssl",
         "package": "OpenSSL",
         "repo": "crueter-ci/OpenSSL",
-        "version": "3.6.0-1cb0d36b39"
+        "version": "4.0.0-11b7b6ea3b"
     },
     "openssl-cmake": {
         "bundled": true,

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/ui/SettingsFragmentPresenter.kt

@@ -99,12 +99,7 @@ class SettingsFragmentPresenter(
 
             add(BooleanSetting.RENDERER_FRAME_GEN.key)
             add(IntSetting.RENDERER_FRAME_GEN_TARGET_RATE.key)
-            if (IntSetting.RENDERER_FRAME_GEN_TARGET_RATE.getInt(
-                    getNeedsGlobalForKey(IntSetting.RENDERER_FRAME_GEN_TARGET_RATE.key)
-                ) == 0
-            ) {
-                add(IntSetting.RENDERER_FRAME_GEN_MULTIPLIER.key)
-            }
+            add(IntSetting.RENDERER_FRAME_GEN_MULTIPLIER.key)
             add(IntSetting.RENDERER_FRAME_GEN_QUEUE_TARGET.key)
             add(BooleanSetting.RENDERER_FRAME_GEN_FLOW_SCALE_AUTO.key)
             if (!BooleanSetting.RENDERER_FRAME_GEN_FLOW_SCALE_AUTO.getBoolean(
@@ -312,6 +307,8 @@ class SettingsFragmentPresenter(
     // TODO(crueter): sub-submenus?
     private fun addGraphicsSettings(sl: ArrayList<SettingsItem>) {
         sl.apply {
+            // add(IntSetting.RENDERER_NVDEC_EMULATION.key)
+
             add(IntSetting.RENDERER_RESOLUTION.key)
             add(IntSetting.RENDERER_VSYNC.key)
             add(IntSetting.RENDERER_SCALING_FILTER.key)
@@ -328,7 +325,6 @@ class SettingsFragmentPresenter(
             add(IntSetting.MAX_ANISOTROPY.key)
             add(IntSetting.RENDERER_VRAM_USAGE_MODE.key)
             add(IntSetting.RENDERER_ASTC_DECODE_METHOD.key)
-            add(IntSetting.RENDERER_NVDEC_EMULATION.key)
 
             add(BooleanSetting.SYNC_MEMORY_OPERATIONS.key)
             add(BooleanSetting.RENDERER_USE_DISK_SHADER_CACHE.key)

src/android/app/src/main/java/org/yuzu/yuzu_emu/ui/GamesFragment.kt

@@ -18,7 +18,6 @@ import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
-import androidx.core.view.doOnPreDraw
 import androidx.core.view.updatePadding
 import androidx.core.widget.doOnTextChanged
 import androidx.fragment.app.Fragment
@@ -60,10 +59,6 @@ class GamesFragment : Fragment() {
 
     private var lastViewType: Int = GameAdapter.VIEW_TYPE_GRID
     private var fallbackBottomInset: Int = 0
-    private var pendingPostReloadListSettle = false
-    private var pendingPostReloadListSettleGeneration = 0
-    private var gameListSubmitGeneration = 0
-    private var committedGameListSubmitGeneration = 0
 
     companion object {
         private const val SEARCH_TEXT = "SearchText"
@@ -173,9 +168,10 @@ class GamesFragment : Fragment() {
 
         gamesViewModel.shouldScrollAfterReload.collect(viewLifecycleOwner) { shouldScroll ->
             if (shouldScroll) {
-                pendingPostReloadListSettle = true
-                pendingPostReloadListSettleGeneration = gameListSubmitGeneration
-                schedulePostReloadListSettle()
+                binding.gridGames.post {
+                    (binding.gridGames as? CarouselRecyclerView)?.pendingScrollAfterReload = true
+                    gameAdapter.notifyDataSetChanged()
+                }
                 gamesViewModel.setShouldScrollAfterReload(false)
             }
         }
@@ -277,42 +273,11 @@ class GamesFragment : Fragment() {
             lastSearchText = currentSearchText
             lastFilter = currentFilter
         } else {
-            submitGameList(games)
+            ((binding.gridGames as? RecyclerView)?.adapter as? GameAdapter)?.submitList(games)
             gamesViewModel.setFilteredGames(games)
         }
     }
 
-    private fun submitGameList(games: List<Game>) {
-        val adapter = (binding.gridGames as? RecyclerView)?.adapter as? GameAdapter
-        if (adapter == null) {
-            schedulePostReloadListSettle()
-            return
-        }
-
-        val submitGeneration = ++gameListSubmitGeneration
-        adapter.submitList(games) {
-            if (committedGameListSubmitGeneration < submitGeneration) {
-                committedGameListSubmitGeneration = submitGeneration
-            }
-            schedulePostReloadListSettle()
-        }
-    }
-
-
-    private fun schedulePostReloadListSettle() {
-        if (!pendingPostReloadListSettle || _binding == null) return
-
-        binding.gridGames.doOnPreDraw {
-            if (!pendingPostReloadListSettle || _binding == null) return@doOnPreDraw
-            if (committedGameListSubmitGeneration < pendingPostReloadListSettleGeneration) {
-                schedulePostReloadListSettle()
-                return@doOnPreDraw
-            }
-            pendingPostReloadListSettle = false
-
-            (binding.gridGames as? CarouselRecyclerView)?.refreshView()
-        }
-    }
     private fun setupTopView() {
         binding.searchText.doOnTextChanged() { text: CharSequence?, _: Int, _: Int, _: Int ->
             if (text.toString().isNotEmpty()) {
@@ -449,7 +414,9 @@ class GamesFragment : Fragment() {
 
         val searchTerm = binding.searchText.text.toString().lowercase(Locale.getDefault())
         if (searchTerm.isEmpty()) {
-            submitGameList(filteredList)
+            ((binding.gridGames as? RecyclerView)?.adapter as? GameAdapter)?.submitList(
+                filteredList
+            )
             gamesViewModel.setFilteredGames(filteredList)
             return
         }
@@ -465,7 +432,7 @@ class GamesFragment : Fragment() {
             }
         }.sortedByDescending { it.score }.map { it.item }
 
-        submitGameList(sortedList)
+        ((binding.gridGames as? RecyclerView)?.adapter as? GameAdapter)?.submitList(sortedList)
         gamesViewModel.setFilteredGames(sortedList)
     }
 

src/android/app/src/main/java/org/yuzu/yuzu_emu/views/CarouselRecyclerView.kt

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 package org.yuzu.yuzu_emu.ui
@@ -11,8 +11,6 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.PagerSnapHelper
 import androidx.recyclerview.widget.RecyclerView
 import kotlin.math.abs
-import kotlin.math.cos
-import kotlin.math.sin
 import org.yuzu.yuzu_emu.R
 import org.yuzu.yuzu_emu.adapters.GameAdapter
 import androidx.core.view.doOnNextLayout
@@ -36,7 +34,6 @@ class CarouselRecyclerView @JvmOverloads constructor(
     private var overlapDecoration: OverlappingDecoration? = null
     private var pagerSnapHelper: PagerSnapHelper? = null
     private var scalingScrollListener: OnScrollListener? = null
-    private var savedItemAnimator: RecyclerView.ItemAnimator? = null
 
     companion object {
         private const val CAROUSEL_CARD_SIZE_FACTOR = "CarouselCardSizeMultiplier"
@@ -45,13 +42,8 @@ class CarouselRecyclerView @JvmOverloads constructor(
         private const val CAROUSEL_OVERLAP_FACTOR = "CarouselOverlapFactor"
         private const val CAROUSEL_MAX_FLING_COUNT = "CarouselMaxFlingCount"
         private const val CAROUSEL_FLING_MULTIPLIER = "CarouselFlingMultiplier"
-        private const val CAROUSEL_ARC_ANGLE_STEP_DEGREES = 15.0
-        private const val CAROUSEL_ARC_MAX_ANGLE_DEGREES = 165.0
-        private const val CAROUSEL_ARC_DEPTH_MAX_ANGLE_DEGREES = 85.0
-        private const val CAROUSEL_ARC_DEPTH_STRETCH = 5.0f
-        private const val CAROUSEL_ARC_X_DEPTH_FACTOR = 0.55f
-        private const val CAROUSEL_ARC_FADE_OUT_START_DEGREES = 60.0
-        private const val CAROUSEL_ARC_FADE_OUT_END_DEGREES = 95.0
+        private const val CAROUSEL_CARDS_SCALING_SHAPE = "CarouselCardsScalingShape"
+        private const val CAROUSEL_CARDS_ALPHA_SHAPE = "CarouselCardsAlphaShape"
         const val CAROUSEL_LAST_SCROLL_POSITION = "CarouselLastScrollPosition"
         const val CAROUSEL_VIEW_TYPE_PORTRAIT = "GamesViewTypePortrait"
         const val CAROUSEL_VIEW_TYPE_LANDSCAPE = "GamesViewTypeLandscape"
@@ -168,52 +160,46 @@ class CarouselRecyclerView @JvmOverloads constructor(
         }
     }
 
+    fun shapingFunction(x: Float, option: Int = 0): Float {
+        return when (option) {
+            0 -> 1f // Off
+            1 -> 1f - x // linear descending
+            2 -> (1f - x) * (1f - x) // Ease out
+            3 -> if (x < 0.05f) 1f else (1f - x) * 0.8f
+            4 -> kotlin.math.cos(x * Math.PI).toFloat() // Cosine
+            5 -> kotlin.math.cos((1.5f * x).coerceIn(0f, 1f) * Math.PI).toFloat() // Cosine 1.5x trimmed
+            else -> 1f // Default to Off
+        }
+    }
+
     fun updateChildScaleAndAlphaForPosition(child: View) {
         val cardSize = (adapter as? GameAdapter ?: return).cardSize
         val position = getChildViewHolder(child).bindingAdapterPosition
         if (position == RecyclerView.NO_POSITION || cardSize <= 0) {
             return // No valid position or card size
         }
-        val layoutParams = child.layoutParams
-        if (layoutParams.width != cardSize || layoutParams.height != cardSize) {
-            child.layoutParams = layoutParams.apply {
-                width = cardSize
-                height = cardSize
-            }
-        }
-
-        val signedDistance = getChildDistanceToCenter(child)
-        val itemStep = (cardSize - overlapPx).toFloat().coerceAtLeast(1f)
-        val angleStep = Math.toRadians(CAROUSEL_ARC_ANGLE_STEP_DEGREES).toFloat()
-        val maxAngle = Math.toRadians(CAROUSEL_ARC_MAX_ANGLE_DEGREES).toFloat()
-        val depthMaxAngle = Math.toRadians(CAROUSEL_ARC_DEPTH_MAX_ANGLE_DEGREES).toFloat()
-        val fadeOutStartAngle = Math.toRadians(CAROUSEL_ARC_FADE_OUT_START_DEGREES).toFloat()
-        val fadeOutEndAngle = Math.toRadians(CAROUSEL_ARC_FADE_OUT_END_DEGREES).toFloat()
-        val angle = (signedDistance / itemStep * angleStep).coerceIn(-maxAngle, maxAngle)
-        val arcRadius = itemStep / angleStep
-        val arcX = sin(angle) * arcRadius
-        val absoluteAngle = abs(angle)
-        val rawDepthInput = ((1f - cos(absoluteAngle)) / (1f - cos(depthMaxAngle)))
-            .coerceIn(0f, 1f)
-        val easedDepthTail = Math.pow(
-            (1f - rawDepthInput).toDouble(),
-            CAROUSEL_ARC_DEPTH_STRETCH.toDouble()
-        ).toFloat()
-        val depthInput = (1f - easedDepthTail).coerceIn(0f, 1f)
-        val projectedArcX = arcX * (1f - rawDepthInput * CAROUSEL_ARC_X_DEPTH_FACTOR)
-
-        child.animate().cancel()
-        child.translationX = projectedArcX - signedDistance
+        child.layoutParams.width = cardSize
+        child.layoutParams.height = cardSize
 
+        val center = getRecyclerViewCenter()
+        val distance = abs(getChildDistanceToCenter(child))
         val internalBorderScale = resources.getFraction(R.fraction.carousel_bordercards_scale, 1, 1)
         val borderScale = preferences.getFloat(CAROUSEL_BORDERCARDS_SCALE, internalBorderScale).coerceIn(
             0f,
             1f
         )
 
-        val shapedScaling = 1f - depthInput
+        val shapeInput = (distance / center).coerceIn(0f, 1f)
+        val internalShapeSetting = resources.getInteger(R.integer.carousel_cards_scaling_shape)
+        val scalingShapeSetting = preferences.getInt(
+            CAROUSEL_CARDS_SCALING_SHAPE,
+            internalShapeSetting
+        )
+        val shapedScaling = shapingFunction(shapeInput, scalingShapeSetting)
         val scale = (borderScale + (1f - borderScale) * shapedScaling).coerceIn(0f, 1f)
 
+        val maxDistance = width / 2f
+        val alphaInput = (distance / maxDistance).coerceIn(0f, 1f)
         val internalBordersAlpha = resources.getFraction(
             R.fraction.carousel_bordercards_alpha,
             1,
@@ -223,12 +209,15 @@ class CarouselRecyclerView @JvmOverloads constructor(
             0f,
             1f
         )
-        val shapedAlpha = cos(depthInput * Math.PI).toFloat()
-        val baseAlpha = (borderAlpha + (1f - borderAlpha) * shapedAlpha).coerceIn(0f, 1f)
-        val rearPresence = (1f - (absoluteAngle - fadeOutStartAngle) /
-            (fadeOutEndAngle - fadeOutStartAngle)).coerceIn(0f, 1f)
-        val alpha = (baseAlpha * rearPresence).coerceIn(0f, 1f)
+        val internalAlphaShapeSetting = resources.getInteger(R.integer.carousel_cards_alpha_shape)
+        val alphaShapeSetting = preferences.getInt(
+            CAROUSEL_CARDS_ALPHA_SHAPE,
+            internalAlphaShapeSetting
+        )
+        val shapedAlpha = shapingFunction(alphaInput, alphaShapeSetting)
+        val alpha = (borderAlpha + (1f - borderAlpha) * shapedAlpha).coerceIn(0f, 1f)
 
+        child.animate().cancel()
         child.alpha = alpha
         child.scaleX = scale
         child.scaleY = scale
@@ -284,9 +273,7 @@ class CarouselRecyclerView @JvmOverloads constructor(
             0f,
             1f
         )
-        val scaledHeight = height * userFactor
-        val availableHeight = height - bottomInset
-        return minOf(scaledHeight.toInt(), availableHeight.toInt())
+        return (userFactor * (height - bottomInset)).toInt()
     }
 
     fun setupCarousel(enabled: Boolean) {
@@ -295,13 +282,6 @@ class CarouselRecyclerView @JvmOverloads constructor(
             if (gameAdapter.cardSize == 0) return
             if (bottomInset < 0) return
 
-            itemAnimator?.let {
-                if (savedItemAnimator == null) {
-                    savedItemAnimator = it
-                }
-                itemAnimator = null
-            }
-
             useCustomDrawingOrder = true
             val cardSize = gameAdapter.cardSize
 
@@ -356,12 +336,6 @@ class CarouselRecyclerView @JvmOverloads constructor(
             // Detach PagerSnapHelper
             pagerSnapHelper?.attachToRecyclerView(null)
             pagerSnapHelper = null
-            savedItemAnimator?.let {
-                if (itemAnimator == null) {
-                    itemAnimator = it
-                }
-                savedItemAnimator = null
-            }
             useCustomDrawingOrder = false
             // Reset padding and fling
             setPadding(0, 0, 0, 0)
@@ -370,7 +344,6 @@ class CarouselRecyclerView @JvmOverloads constructor(
             // Reset scaling
             for (i in 0 until childCount) {
                 val child = getChildAt(i)
-                child?.translationX = 0f
                 child?.scaleX = 1f
                 child?.scaleY = 1f
                 child?.alpha = 1f

src/android/app/src/main/res/values/integers.xml

@@ -5,6 +5,8 @@
     <integer name="game_columns_grid">2</integer>
     <integer name="carousel_max_fling_count">4</integer>
     <integer name="carousel_focus_search_repeat_threshold_ms">100</integer>
+    <integer name="carousel_cards_scaling_shape">1</integer>
+    <integer name="carousel_cards_alpha_shape">4</integer>
 
     <!-- Default SWITCH landscape layout -->
     <integer name="BUTTON_A_X">760</integer>

src/android/app/src/main/res/values/strings.xml

@@ -111,7 +111,7 @@
 
     <!-- NVDEC Emulation -->
     <string name="nvdec_emulation">NVDEC Emulation</string>
-    <string name="nvdec_emulation_description">Change to CPU if a crash occurs on cinematics.</string>
+    <string name="nvdec_emulation_description">Select how video decoding (NVDEC) is handled during cutscenes and intros.</string>
     <string name="nvdec_emulation_cpu" translatable="false">CPU</string>
     <string name="nvdec_emulation_gpu" translatable="false">GPU</string>
     <string name="nvdec_emulation_none">None</string>

src/common/fs/file.cpp

@@ -7,18 +7,25 @@
 #include <vector>
 
 #include "common/assert.h"
+#include "common/bit_util.h"
 #include "common/fs/file.h"
 #include "common/fs/fs.h"
+#include "common/fs/fs_types.h"
 #ifdef __ANDROID__
 #include "common/fs/fs_android.h"
 #endif
 #include "common/logging.h"
+#include "common/literals.h"
 
 #ifdef _WIN32
 #include <io.h>
 #include <share.h>
+#include <windows.h>
 #else
 #include <unistd.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #endif
 
 #ifdef _MSC_VER
@@ -36,13 +43,13 @@ namespace {
 #ifdef _WIN32
 
 /**
- * Converts the file access mode and file type enums to a file access mode wide string.
- *
- * @param mode File access mode
- * @param type File type
- *
- * @returns A pointer to a wide string representing the file access mode.
- */
+* Converts the file access mode and file type enums to a file access mode wide string.
+*
+* @param mode File access mode
+* @param type File type
+*
+* @returns A pointer to a wide string representing the file access mode.
+*/
 [[nodiscard]] constexpr const wchar_t* AccessModeToWStr(FileAccessMode mode, FileType type) {
     switch (type) {
     case FileType::BinaryFile:
@@ -79,12 +86,12 @@ namespace {
 }
 
 /**
- * Converts the file-share access flag enum to a Windows defined file-share access flag.
- *
- * @param flag File-share access flag
- *
- * @returns Windows defined file-share access flag.
- */
+* Converts the file-share access flag enum to a Windows defined file-share access flag.
+*
+* @param flag File-share access flag
+*
+* @returns Windows defined file-share access flag.
+*/
 [[nodiscard]] constexpr int ToWindowsFileShareFlag(FileShareFlag flag) {
     switch (flag) {
     case FileShareFlag::ShareNone:
@@ -102,13 +109,13 @@ namespace {
 #else
 
 /**
- * Converts the file access mode and file type enums to a file access mode string.
- *
- * @param mode File access mode
- * @param type File type
- *
- * @returns A pointer to a string representing the file access mode.
- */
+* Converts the file access mode and file type enums to a file access mode string.
+*
+* @param mode File access mode
+* @param type File type
+*
+* @returns A pointer to a string representing the file access mode.
+*/
 [[nodiscard]] constexpr const char* AccessModeToStr(FileAccessMode mode, FileType type) {
     switch (type) {
     case FileType::BinaryFile:
@@ -147,12 +154,12 @@ namespace {
 #endif
 
 /**
- * Converts the seek origin enum to a seek origin integer.
- *
- * @param origin Seek origin
- *
- * @returns Seek origin integer.
- */
+* Converts the seek origin enum to a seek origin integer.
+*
+* @param origin Seek origin
+*
+* @returns Seek origin integer.
+*/
 [[nodiscard]] constexpr int ToSeekOrigin(SeekOrigin origin) {
     switch (origin) {
     case SeekOrigin::SetOrigin:
@@ -178,7 +185,7 @@ std::string ReadStringFromFile(const std::filesystem::path& path, FileType type)
 }
 
 size_t WriteStringToFile(const std::filesystem::path& path, FileType type,
-                         std::string_view string) {
+                        std::string_view string) {
     if (Exists(path) && !IsFile(path)) {
         return 0;
     }
@@ -189,7 +196,7 @@ size_t WriteStringToFile(const std::filesystem::path& path, FileType type,
 }
 
 size_t AppendStringToFile(const std::filesystem::path& path, FileType type,
-                          std::string_view string) {
+                        std::string_view string) {
     if (Exists(path) && !IsFile(path)) {
         return 0;
     }
@@ -244,69 +251,189 @@ FileType IOFile::GetType() const {
     return file_type;
 }
 
+#if defined(__unix__)
+static int PlatformMapReadOnly(IOFile& io, const char* path) {
+    io.mmap_fd = open(path, O_RDONLY);
+    if (io.mmap_fd > 0) {
+        struct stat st;
+        fstat(io.mmap_fd, &st);
+        io.mmap_size = st.st_size;
+
+        int map_flags = MAP_PRIVATE;
+#ifdef MAP_PREFAULT_READ
+        // Prefaults reads so the final resulting pagetable from this big stupid mmap()
+        // isn't comically lazily loaded, we just coalesce everything in-place for our
+        // lovely mmap flags; if we didn't prefault the reads the page table will be
+        // constructed in-place (i.e on a read-by-read basis) causing lovely soft-faults
+        // which would nuke any performance gains.
+        //
+        // This of course incurs a cost in the initial mmap(2) call, but that is fine.
+        map_flags |= MAP_PREFAULT_READ;
+#endif
+#ifdef MAP_NOSYNC
+        // This causes physical media to not be synched to our file/memory
+        // This means that if the read-only file is written to, we won't see changes
+        // or we may see changes which are just funnily scattered, in any case
+        // this presumes the files won't be changed during execution
+        //
+        // Do not ever use this on write files (if we ever support that); this will create
+        // a fun amount of fragmentation on the disk.
+        map_flags |= MAP_NOSYNC;
+#endif
+#if defined(NDEBUG) && defined(MAP_NOCORE)
+        map_flags |= MAP_NOCORE;
+#endif
+#ifdef MAP_HUGE_2MB
+        map_flags |= MAP_HUGE_2MB; //2mb pages
+#elif defined(MAP_ALIGNED)
+        // File must be big enough that it's worth to super align. We can't just super-align every
+        // file otherwise we will run out of alignments for actually important files :)
+        // System doesn't guarantee a super alignment, but if it's available it will delete
+        // about 3 layers(?) of the TLB tree for each read/write.
+        // Again the cost of faults may make this negligible gains, but hey, we gotta work
+        // what we gotta work with.
+        map_flags |= MAP_ALIGNED(21); //2^21 = 2mb use 2MB pages
+#endif
+        io.mmap_base = (u8*)mmap(nullptr, io.mmap_size, PROT_READ, map_flags, io.mmap_fd, 0);
+        if (io.mmap_base == MAP_FAILED) {
+            close(io.mmap_fd);
+            io.mmap_fd = -1;
+        } else {
+            using namespace Common::Literals;
+            // For small files it is acceptable to use a full readahead
+            // See https://github.com/torvalds/linux/blob/e80d033851b3bc94c3d254ac66660ddd0a49d72c/include/linux/pagemap.h#L1392
+            if (u64(st.st_size) >= 256_MiB) {
+                posix_madvise(io.mmap_base, io.mmap_size, POSIX_MADV_RANDOM);
+            } else {
+                posix_madvise(io.mmap_base, io.mmap_size, POSIX_MADV_SEQUENTIAL);
+            }
+        }
+    }
+    return io.mmap_fd;
+}
+static void PlatformUnmap(IOFile& io) {
+    if (io.mmap_fd != -1) {
+        munmap(io.mmap_base, io.mmap_size);
+        close(io.mmap_fd);
+        io.mmap_fd = -1;
+    }
+}
+#elif defined(__APPLE__)
+// NO IMPLEMENTATION YET
+#else
+static int PlatformMapReadOnly(IOFile& io, const wchar_t* path) {
+    io.file_handle = CreateFileW(path, GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, nullptr);
+    if (HANDLE(io.file_handle) != INVALID_HANDLE_VALUE) {
+        io.mapping_handle = CreateFileMappingW(HANDLE(io.file_handle), nullptr, PAGE_READONLY, 0, 0, nullptr);
+        if (io.mapping_handle) {
+            io.mmap_base = (u8*)MapViewOfFile(HANDLE(io.mapping_handle), FILE_MAP_READ, 0, 0, 0);
+            if (io.mmap_base) {
+                _LARGE_INTEGER pvalue;
+                GetFileSizeEx(io.file_handle, &pvalue);
+                io.mmap_size = uint32_t(pvalue.QuadPart);
+            } else {
+                CloseHandle(io.mapping_handle);
+                CloseHandle(io.file_handle);
+                return -1;
+            }
+        } else {
+            CloseHandle(io.file_handle);
+            return -1;
+        }
+    }
+    return 0;
+}
+static void PlatformUnmap(IOFile& io) {
+    if(io.mapping_handle) {
+        if(io.mmap_base)
+            UnmapViewOfFile(HANDLE(io.mmap_base));
+        CloseHandle(HANDLE(io.mapping_handle));
+    }
+    if(io.file_handle != INVALID_HANDLE_VALUE)
+        CloseHandle(HANDLE(io.file_handle));
+}
+#endif
+
 void IOFile::Open(const fs::path& path, FileAccessMode mode, FileType type, FileShareFlag flag) {
     Close();
-
     file_path = path;
     file_access_mode = mode;
     file_type = type;
-
     errno = 0;
-
 #ifdef _WIN32
-    if (flag != FileShareFlag::ShareNone) {
-        file = _wfsopen(path.c_str(), AccessModeToWStr(mode, type), ToWindowsFileShareFlag(flag));
-    } else {
-        _wfopen_s(&file, path.c_str(), AccessModeToWStr(mode, type));
+    // TODO: this probably can use better logic but oh well I'm not a windowser
+    file_handle = nullptr;
+    if (type == FileType::BinaryFile && mode == FileAccessMode::Read) {
+        if (PlatformMapReadOnly(*this, path.c_str()) == -1) {
+            LOG_ERROR(Common_Filesystem, "Error mmap'ing file"); //: {}", path.c_str());
+        }
+    }
+    if (file_handle == nullptr) {
+        if (flag != FileShareFlag::ShareNone) {
+            file = _wfsopen(path.c_str(), AccessModeToWStr(mode, type), ToWindowsFileShareFlag(flag));
+        } else {
+            _wfopen_s(&file, path.c_str(), AccessModeToWStr(mode, type));
+        }
     }
 #elif __ANDROID__
     if (Android::IsContentUri(path)) {
         ASSERT_MSG(mode == FileAccessMode::Read, "Content URI file access is for read-only!");
-        const auto fd = Android::OpenContentUri(path, Android::OpenMode::Read);
-        if (fd != -1) {
-            file = fdopen(fd, "r");
-            const auto error_num = errno;
-            if (error_num != 0 && file == nullptr) {
-                LOG_ERROR(Common_Filesystem, "Error opening file: {}, error: {}", path.c_str(),
-                          strerror(error_num));
+        if (PlatformMapReadOnly(*this, path.c_str()) == -1) {
+            LOG_ERROR(Common_Filesystem, "Error mmap'ing file: {}", path.c_str());
+            int const fd = Android::OpenContentUri(path, Android::OpenMode::Read);
+            if (fd != -1) {
+                file = fdopen(fd, "r");
+                if (errno != 0 && file == nullptr)
+                    LOG_ERROR(Common_Filesystem, "Error opening file: {}, error: {}", path.c_str(), strerror(errno));
+            } else {
+                LOG_ERROR(Common_Filesystem, "Error opening file: {}", path.c_str());
             }
-        } else {
-            LOG_ERROR(Common_Filesystem, "Error opening file: {}", path.c_str());
         }
     } else {
         file = std::fopen(path.c_str(), AccessModeToStr(mode, type));
     }
+#elif defined(__HAIKU__) || defined(__managarm__) || defined(__OPENORBIS__) || defined(__APPLE__)
+    file = std::fopen(path.c_str(), AccessModeToStr(mode, type));
+#elif defined(__unix__)
+    if (type == FileType::BinaryFile && mode == FileAccessMode::Read) {
+        if (PlatformMapReadOnly(*this, path.c_str()) == -1) {
+            LOG_ERROR(Common_Filesystem, "Error mmap'ing file: {}", path.c_str());
+        }
+    }
+    if (mmap_fd == -1) {
+        file = std::fopen(path.c_str(), AccessModeToStr(mode, type)); // mmap(2) failed or simply we can't use it
+    }
 #else
+    // Some other fancy OS (ahem fucking Darwin/Mac OSX)
     file = std::fopen(path.c_str(), AccessModeToStr(mode, type));
 #endif
-
     if (!IsOpen()) {
         const auto ec = std::error_code{errno, std::generic_category()};
         LOG_ERROR(Common_Filesystem, "Failed to open the file at path={}, ec_message={}",
-                  PathToUTF8String(file_path), ec.message());
+            PathToUTF8String(file_path), ec.message());
     }
 }
 
 void IOFile::Close() {
-    if (!IsOpen()) {
-        return;
+#if defined(__APPLE__)
+    // NO IMPLEMENTATION YET
+#else
+    PlatformUnmap(*this);
+#endif
+    if (file) {
+        errno = 0;
+        const auto close_result = std::fclose(file) == 0;
+        if (!close_result) {
+            const auto ec = std::error_code{errno, std::generic_category()};
+            LOG_ERROR(Common_Filesystem, "Failed to close the file at path={}, ec_message={}",
+                PathToUTF8String(file_path), ec.message());
+        }
+        file = nullptr;
     }
-
-    errno = 0;
-
-    const auto close_result = std::fclose(file) == 0;
-
-    if (!close_result) {
-        const auto ec = std::error_code{errno, std::generic_category()};
-        LOG_ERROR(Common_Filesystem, "Failed to close the file at path={}, ec_message={}",
-                  PathToUTF8String(file_path), ec.message());
-    }
-
-    file = nullptr;
 }
 
 bool IOFile::IsOpen() const {
-    return file != nullptr;
+    return file != nullptr || IsMappedFile();
 }
 
 std::string IOFile::ReadString(size_t length) const {
@@ -323,137 +450,132 @@ size_t IOFile::WriteString(std::span<const char> string) const {
 }
 
 bool IOFile::Flush() const {
-    if (!IsOpen()) {
-        return false;
+    ASSERT(!IsMappedFile());
+    if (file) {
+        errno = 0;
+        auto const flush_result = std::fflush(file) == 0;
+        if (!flush_result) {
+            const auto ec = std::error_code{errno, std::generic_category()};
+            LOG_ERROR(Common_Filesystem, "Failed to flush the file at path={}, ec_message={}",
+                PathToUTF8String(file_path), ec.message());
+        }
+        return flush_result;
     }
-
-    errno = 0;
-
-#ifdef _WIN32
-    const auto flush_result = std::fflush(file) == 0;
-#else
-    const auto flush_result = std::fflush(file) == 0;
-#endif
-
-    if (!flush_result) {
-        const auto ec = std::error_code{errno, std::generic_category()};
-        LOG_ERROR(Common_Filesystem, "Failed to flush the file at path={}, ec_message={}",
-                  PathToUTF8String(file_path), ec.message());
-    }
-
-    return flush_result;
+    return false;
 }
 
 bool IOFile::Commit() const {
-    if (!IsOpen()) {
-        return false;
-    }
-
-    errno = 0;
-
+    ASSERT(!IsMappedFile());
+    if (file) {
+        errno = 0;
 #ifdef _WIN32
-    const auto commit_result = std::fflush(file) == 0 && _commit(fileno(file)) == 0;
+        const auto commit_result = std::fflush(file) == 0 && _commit(fileno(file)) == 0;
 #else
-    const auto commit_result = std::fflush(file) == 0 && fsync(fileno(file)) == 0;
+        const auto commit_result = std::fflush(file) == 0 && fsync(fileno(file)) == 0;
 #endif
-
-    if (!commit_result) {
-        const auto ec = std::error_code{errno, std::generic_category()};
-        LOG_ERROR(Common_Filesystem, "Failed to commit the file at path={}, ec_message={}",
-                  PathToUTF8String(file_path), ec.message());
+        if (!commit_result) {
+            const auto ec = std::error_code{errno, std::generic_category()};
+            LOG_ERROR(Common_Filesystem, "Failed to commit the file at path={}, ec_message={}",
+                PathToUTF8String(file_path), ec.message());
+        }
+        return commit_result;
     }
-
-    return commit_result;
+    return false;
 }
 
 bool IOFile::SetSize(u64 size) const {
-    if (!IsOpen()) {
-        return false;
-    }
-
-    errno = 0;
-
+    ASSERT(!IsMappedFile());
+    if (file) {
+        errno = 0;
 #ifdef _WIN32
-    const auto set_size_result = _chsize_s(fileno(file), static_cast<s64>(size)) == 0;
+        const auto set_size_result = _chsize_s(fileno(file), s64(size)) == 0;
 #else
-    const auto set_size_result = ftruncate(fileno(file), static_cast<s64>(size)) == 0;
+        const auto set_size_result = ftruncate(fileno(file), s64(size)) == 0;
 #endif
-
-    if (!set_size_result) {
-        const auto ec = std::error_code{errno, std::generic_category()};
-        LOG_ERROR(Common_Filesystem, "Failed to resize the file at path={}, size={}, ec_message={}",
-                  PathToUTF8String(file_path), size, ec.message());
+        if (!set_size_result) {
+            const auto ec = std::error_code{errno, std::generic_category()};
+            LOG_ERROR(Common_Filesystem, "Failed to resize the file at path={}, size={}, ec_message={}",
+                PathToUTF8String(file_path), size, ec.message());
+        }
+        return set_size_result;
     }
-
-    return set_size_result;
+    return false;
 }
 
 u64 IOFile::GetSize() const {
-    if (!IsOpen()) {
-        return 0;
-    }
+    if (IsMappedFile())
+        return mmap_size;
+    if (file) {
+        // Flush any unwritten buffered data into the file prior to retrieving the file mmap_size.
+        std::fflush(file);
+#if __ANDROID__
+        u64 file_size = 0;
+        if (Android::IsContentUri(file_path)) {
+            file_size = Android::GetSize(file_path);
+        } else {
+            std::error_code ec;
 
-    // Flush any unwritten buffered data into the file prior to retrieving the file size.
-    std::fflush(file);
+            file_size = fs::file_size(file_path, ec);
 
-#ifdef __ANDROID__
-    u64 file_size = 0;
-    if (Android::IsContentUri(file_path)) {
-        file_size = Android::GetSize(file_path);
-    } else {
+            if (ec) {
+                LOG_ERROR(Common_Filesystem, "Failed to retrieve the file mmap_size of path={}, ec_message={}",
+                    PathToUTF8String(file_path), ec.message());
+                return 0;
+            }
+        }
+#else
         std::error_code ec;
-
-        file_size = fs::file_size(file_path, ec);
-
+        auto const file_size = fs::file_size(file_path, ec);
         if (ec) {
-            LOG_ERROR(Common_Filesystem,
-                      "Failed to retrieve the file size of path={}, ec_message={}",
-                      PathToUTF8String(file_path), ec.message());
+            LOG_ERROR(Common_Filesystem, "Failed to retrieve the file mmap_size of path={}, ec_message={}",
+                PathToUTF8String(file_path), ec.message());
             return 0;
         }
-    }
-#else
-    std::error_code ec;
-
-    const auto file_size = fs::file_size(file_path, ec);
-
-    if (ec) {
-        LOG_ERROR(Common_Filesystem, "Failed to retrieve the file size of path={}, ec_message={}",
-                  PathToUTF8String(file_path), ec.message());
-        return 0;
-    }
 #endif
-
-    return file_size;
+        return file_size;
+    }
+    return 0;
 }
 
 bool IOFile::Seek(s64 offset, SeekOrigin origin) const {
-    if (!IsOpen()) {
-        return false;
+    if (IsMappedFile()) {
+        // fuck you to whoever made this method const
+        switch (origin) {
+        case SeekOrigin::SetOrigin:
+            mmap_offset = s64(offset);
+            break;
+        case SeekOrigin::CurrentPosition:
+            mmap_offset += s64(offset);
+            break;
+        case SeekOrigin::End:
+            mmap_offset = s64(mmap_size) + s64(offset);
+            break;
+        }
+        return true;
     }
-
-    errno = 0;
-
-    const auto seek_result = fseeko(file, offset, ToSeekOrigin(origin)) == 0;
-
-    if (!seek_result) {
-        const auto ec = std::error_code{errno, std::generic_category()};
-        LOG_ERROR(Common_Filesystem,
-                  "Failed to seek the file at path={}, offset={}, origin={}, ec_message={}",
-                  PathToUTF8String(file_path), offset, origin, ec.message());
+    if (file) {
+        errno = 0;
+        const auto seek_result = fseeko(file, offset, ToSeekOrigin(origin)) == 0;
+        if (!seek_result) {
+            const auto ec = std::error_code{errno, std::generic_category()};
+            LOG_ERROR(Common_Filesystem, "Failed to seek the file at path={}, offset={}, origin={}, ec_message={}",
+                PathToUTF8String(file_path), offset, origin, ec.message());
+        }
+        return seek_result;
     }
-
-    return seek_result;
+    return false;
 }
 
 s64 IOFile::Tell() const {
-    if (!IsOpen()) {
-        return 0;
+    if (IsMappedFile()) {
+        errno = 0;
+        return s64(mmap_offset);
     }
-
-    errno = 0;
-
-    return ftello(file);
+    if (file) {
+        errno = 0;
+        return ftello(file);
+    }
+    return 0;
 }
 
 } // namespace Common::FS

src/common/fs/file.h

@@ -7,6 +7,7 @@
 #pragma once
 
 #include <cstdio>
+#include <cstring>
 #include <filesystem>
 #include <span>
 #include <type_traits>
@@ -24,12 +25,12 @@ enum class SeekOrigin {
 };
 
 /**
- * Opens a file stream at path with the specified open mode.
- *
- * @param file_stream Reference to file stream
- * @param path Filesystem path
- * @param open_mode File stream open mode
- */
+* Opens a file stream at path with the specified open mode.
+*
+* @param file_stream Reference to file stream
+* @param path Filesystem path
+* @param open_mode File stream open mode
+*/
 template <typename FileStream>
 void OpenFileStream(FileStream& file_stream, const std::filesystem::path& path,
                     std::ios_base::openmode open_mode) {
@@ -48,14 +49,14 @@ void OpenFileStream(FileStream& file_stream, const Path& path, std::ios_base::op
 #endif
 
 /**
- * Reads an entire file at path and returns a string of the contents read from the file.
- * If the filesystem object at path is not a regular file, this function returns an empty string.
- *
- * @param path Filesystem path
- * @param type File type
- *
- * @returns A string of the contents read from the file.
- */
+* Reads an entire file at path and returns a string of the contents read from the file.
+* If the filesystem object at path is not a regular file, this function returns an empty string.
+*
+* @param path Filesystem path
+* @param type File type
+*
+* @returns A string of the contents read from the file.
+*/
 [[nodiscard]] std::string ReadStringFromFile(const std::filesystem::path& path, FileType type);
 
 #ifdef _WIN32
@@ -70,18 +71,18 @@ template <typename Path>
 #endif
 
 /**
- * Writes a string to a file at path and returns the number of characters successfully written.
- * If a file already exists at path, its contents will be erased.
- * If a file does not exist at path, it creates and opens a new empty file for writing.
- * If the filesystem object at path exists and is not a regular file, this function returns 0.
- *
- * @param path Filesystem path
- * @param type File type
- *
- * @returns Number of characters successfully written.
- */
+* Writes a string to a file at path and returns the number of characters successfully written.
+* If a file already exists at path, its contents will be erased.
+* If a file does not exist at path, it creates and opens a new empty file for writing.
+* If the filesystem object at path exists and is not a regular file, this function returns 0.
+*
+* @param path Filesystem path
+* @param type File type
+*
+* @returns Number of characters successfully written.
+*/
 [[nodiscard]] size_t WriteStringToFile(const std::filesystem::path& path, FileType type,
-                                       std::string_view string);
+                                    std::string_view string);
 
 #ifdef _WIN32
 template <typename Path>
@@ -95,15 +96,15 @@ template <typename Path>
 #endif
 
 /**
- * Appends a string to a file at path and returns the number of characters successfully written.
- * If a file does not exist at path, it creates and opens a new empty file for appending.
- * If the filesystem object at path exists and is not a regular file, this function returns 0.
- *
- * @param path Filesystem path
- * @param type File type
- *
- * @returns Number of characters successfully written.
- */
+* Appends a string to a file at path and returns the number of characters successfully written.
+* If a file does not exist at path, it creates and opens a new empty file for appending.
+* If the filesystem object at path exists and is not a regular file, this function returns 0.
+*
+* @param path Filesystem path
+* @param type File type
+*
+* @returns Number of characters successfully written.
+*/
 [[nodiscard]] size_t AppendStringToFile(const std::filesystem::path& path, FileType type,
                                         std::string_view string);
 
@@ -131,14 +132,14 @@ public:
                     FileShareFlag flag = FileShareFlag::ShareReadOnly);
 
     /**
-     * An IOFile is a lightweight wrapper on C Library file operations.
-     * Automatically closes an open file on the destruction of an IOFile object.
-     *
-     * @param path Filesystem path
-     * @param mode File access mode
-     * @param type File type, default is BinaryFile. Use TextFile to open the file as a text file
-     * @param flag (Windows only) File-share access flag, default is ShareReadOnly
-     */
+    * An IOFile is a lightweight wrapper on C Library file operations.
+    * Automatically closes an open file on the destruction of an IOFile object.
+    *
+    * @param path Filesystem path
+    * @param mode File access mode
+    * @param type File type, default is BinaryFile. Use TextFile to open the file as a text file
+    * @param flag (Windows only) File-share access flag, default is ShareReadOnly
+    */
     explicit IOFile(const std::filesystem::path& path, FileAccessMode mode,
                     FileType type = FileType::BinaryFile,
                     FileShareFlag flag = FileShareFlag::ShareReadOnly);
@@ -152,84 +153,70 @@ public:
     IOFile& operator=(IOFile&& other) noexcept;
 
     /**
-     * Gets the path of the file.
-     *
-     * @returns The path of the file.
-     */
+    * Gets the path of the file.
+    *
+    * @returns The path of the file.
+    */
     [[nodiscard]] std::filesystem::path GetPath() const;
 
     /**
-     * Gets the access mode of the file.
-     *
-     * @returns The access mode of the file.
-     */
+    * Gets the access mode of the file.
+    *
+    * @returns The access mode of the file.
+    */
     [[nodiscard]] FileAccessMode GetAccessMode() const;
 
     /**
-     * Gets the type of the file.
-     *
-     * @returns The type of the file.
-     */
+    * Gets the type of the file.
+    *
+    * @returns The type of the file.
+    */
     [[nodiscard]] FileType GetType() const;
 
     /**
-     * Opens a file at path with the specified file access mode.
-     * This function behaves differently depending on the FileAccessMode.
-     * These behaviors are documented in each enum value of FileAccessMode.
-     *
-     * @param path Filesystem path
-     * @param mode File access mode
-     * @param type File type, default is BinaryFile. Use TextFile to open the file as a text file
-     * @param flag (Windows only) File-share access flag, default is ShareReadOnly
-     */
+    * Opens a file at path with the specified file access mode.
+    * This function behaves differently depending on the FileAccessMode.
+    * These behaviors are documented in each enum value of FileAccessMode.
+    *
+    * @param path Filesystem path
+    * @param mode File access mode
+    * @param type File type, default is BinaryFile. Use TextFile to open the file as a text file
+    * @param flag (Windows only) File-share access flag, default is ShareReadOnly
+    */
     void Open(const std::filesystem::path& path, FileAccessMode mode,
-              FileType type = FileType::BinaryFile,
-              FileShareFlag flag = FileShareFlag::ShareReadOnly);
-
-// #ifdef _WIN32
-//     template <typename Path>
-//     void Open(const Path& path, FileAccessMode mode, FileType type = FileType::BinaryFile,
-//               FileShareFlag flag = FileShareFlag::ShareReadOnly) {
-//         using ValueType = typename Path::value_type;
-//         if constexpr (IsChar<ValueType>) {
-//             Open(ToU8String(path), mode, type, flag);
-//         } else {
-//             Open(std::filesystem::path{path}, mode, type, flag);
-//         }
-//     }
-// #endif
+            FileType type = FileType::BinaryFile,
+            FileShareFlag flag = FileShareFlag::ShareReadOnly);
 
     /// Closes the file if it is opened.
     void Close();
 
     /**
-     * Checks whether the file is open.
-     * Use this to check whether the calls to Open() or Close() succeeded.
-     *
-     * @returns True if the file is open, false otherwise.
-     */
+    * Checks whether the file is open.
+    * Use this to check whether the calls to Open() or Close() succeeded.
+    *
+    * @returns True if the file is open, false otherwise.
+    */
     [[nodiscard]] bool IsOpen() const;
 
     /**
-     * Helper function which deduces the value type of a contiguous STL container used in ReadSpan.
-     * If T is not a contiguous container as defined by the concept IsContiguousContainer, this
-     * calls ReadObject and T must be a trivially copyable object.
-     *
-     * See ReadSpan for more details if T is a contiguous container.
-     * See ReadObject for more details if T is a trivially copyable object.
-     *
-     * @tparam T Contiguous container or trivially copyable object
-     *
-     * @param data Container of T::value_type data or reference to object
-     *
-     * @returns Count of T::value_type data or objects successfully read.
-     */
+    * Helper function which deduces the value type of a contiguous STL container used in ReadSpan.
+    * If T is not a contiguous container as defined by the concept IsContiguousContainer, this
+    * calls ReadObject and T must be a trivially copyable object.
+    *
+    * See ReadSpan for more details if T is a contiguous container.
+    * See ReadObject for more details if T is a trivially copyable object.
+    *
+    * @tparam T Contiguous container or trivially copyable object
+    *
+    * @param data Container of T::value_type data or reference to object
+    *
+    * @returns Count of T::value_type data or objects successfully read.
+    */
     template <typename T>
     [[nodiscard]] size_t Read(T& data) const {
         if constexpr (IsContiguousContainer<T>) {
             using ContiguousType = typename T::value_type;
-            static_assert(std::is_trivially_copyable_v<ContiguousType>,
-                          "Data type must be trivially copyable.");
+            static_assert(std::is_trivially_copyable_v<ContiguousType>, "Data type must be trivially copyable.");
             return ReadSpan<ContiguousType>(data);
         } else {
             return ReadObject(data) ? 1 : 0;
@@ -237,25 +224,24 @@ public:
     }
 
     /**
-     * Helper function which deduces the value type of a contiguous STL container used in WriteSpan.
-     * If T is not a contiguous STL container as defined by the concept IsContiguousContainer, this
-     * calls WriteObject and T must be a trivially copyable object.
-     *
-     * See WriteSpan for more details if T is a contiguous container.
-     * See WriteObject for more details if T is a trivially copyable object.
-     *
-     * @tparam T Contiguous container or trivially copyable object
-     *
-     * @param data Container of T::value_type data or const reference to object
-     *
-     * @returns Count of T::value_type data or objects successfully written.
-     */
+    * Helper function which deduces the value type of a contiguous STL container used in WriteSpan.
+    * If T is not a contiguous STL container as defined by the concept IsContiguousContainer, this
+    * calls WriteObject and T must be a trivially copyable object.
+    *
+    * See WriteSpan for more details if T is a contiguous container.
+    * See WriteObject for more details if T is a trivially copyable object.
+    *
+    * @tparam T Contiguous container or trivially copyable object
+    *
+    * @param data Container of T::value_type data or const reference to object
+    *
+    * @returns Count of T::value_type data or objects successfully written.
+    */
     template <typename T>
     [[nodiscard]] size_t Write(const T& data) const {
         if constexpr (IsContiguousContainer<T>) {
             using ContiguousType = typename T::value_type;
-            static_assert(std::is_trivially_copyable_v<ContiguousType>,
-                          "Data type must be trivially copyable.");
+            static_assert(std::is_trivially_copyable_v<ContiguousType>, "Data type must be trivially copyable.");
             return WriteSpan<ContiguousType>(data);
         } else {
             static_assert(std::is_trivially_copyable_v<T>, "Data type must be trivially copyable.");
@@ -264,197 +250,219 @@ public:
     }
 
     /**
-     * Reads a span of T data from a file sequentially.
-     * This function reads from the current position of the file pointer and
-     * advances it by the (count of T * sizeof(T)) bytes successfully read.
-     *
-     * Failures occur when:
-     * - The file is not open
-     * - The opened file lacks read permissions
-     * - Attempting to read beyond the end-of-file
-     *
-     * @tparam T Data type
-     *
-     * @param data Span of T data
-     *
-     * @returns Count of T data successfully read.
-     */
+    * Reads a span of T data from a file sequentially.
+    * This function reads from the current position of the file pointer and
+    * advances it by the (count of T * sizeof(T)) bytes successfully read.
+    *
+    * Failures occur when:
+    * - The file is not open
+    * - The opened file lacks read permissions
+    * - Attempting to read beyond the end-of-file
+    *
+    * @tparam T Data type
+    *
+    * @param data Span of T data
+    *
+    * @returns Count of T data successfully read.
+    */
     template <typename T>
         requires std::is_trivially_copyable_v<T>
     [[nodiscard]] size_t ReadSpan(std::span<T> data) const {
-        if (!IsOpen()) {
-            return 0;
+        if (IsMappedFile()) {
+            std::memcpy(data.data(), mmap_base + mmap_offset, sizeof(T) * data.size());
+            return data.size();
         }
-        return std::fread(data.data(), sizeof(T), data.size(), file);
+        return IsOpen() ? std::fread(data.data(), sizeof(T), data.size(), file) : 0;
     }
 
     /**
-     * Writes a span of T data to a file sequentially.
-     * This function writes from the current position of the file pointer and
-     * advances it by the (count of T * sizeof(T)) bytes successfully written.
-     *
-     * Failures occur when:
-     * - The file is not open
-     * - The opened file lacks write permissions
-     *
-     * @tparam T Data type
-     *
-     * @param data Span of T data
-     *
-     * @returns Count of T data successfully written.
-     */
+    * Writes a span of T data to a file sequentially.
+    * This function writes from the current position of the file pointer and
+    * advances it by the (count of T * sizeof(T)) bytes successfully written.
+    *
+    * Failures occur when:
+    * - The file is not open
+    * - The opened file lacks write permissions
+    *
+    * @tparam T Data type
+    *
+    * @param data Span of T data
+    *
+    * @returns Count of T data successfully written.
+    */
     template <typename T>
     [[nodiscard]] size_t WriteSpan(std::span<const T> data) const {
         static_assert(std::is_trivially_copyable_v<T>, "Data type must be trivially copyable.");
-
-        if (!IsOpen()) {
-            return 0;
+        if (IsMappedFile()) {
+            std::memcpy(mmap_base + mmap_offset, data.data(), sizeof(T) * data.size());
+            return data.size();
         }
-
-        return std::fwrite(data.data(), sizeof(T), data.size(), file);
+        return IsOpen() ? std::fwrite(data.data(), sizeof(T), data.size(), file) : 0;
     }
 
     /**
-     * Reads a T object from a file sequentially.
-     * This function reads from the current position of the file pointer and
-     * advances it by the sizeof(T) bytes successfully read.
-     *
-     * Failures occur when:
-     * - The file is not open
-     * - The opened file lacks read permissions
-     * - Attempting to read beyond the end-of-file
-     *
-     * @tparam T Data type
-     *
-     * @param object Reference to object
-     *
-     * @returns True if the object is successfully read from the file, false otherwise.
-     */
+    * Reads a T object from a file sequentially.
+    * This function reads from the current position of the file pointer and
+    * advances it by the sizeof(T) bytes successfully read.
+    *
+    * Failures occur when:
+    * - The file is not open
+    * - The opened file lacks read permissions
+    * - Attempting to read beyond the end-of-file
+    *
+    * @tparam T Data type
+    *
+    * @param object Reference to object
+    *
+    * @returns True if the object is successfully read from the file, false otherwise.
+    */
     template <typename T>
     [[nodiscard]] bool ReadObject(T& object) const {
         static_assert(std::is_trivially_copyable_v<T>, "Data type must be trivially copyable.");
         static_assert(!std::is_pointer_v<T>, "T must not be a pointer to an object.");
-
-        if (!IsOpen()) {
-            return false;
+        if (IsMappedFile()) {
+            std::memcpy(&object, mmap_base + mmap_offset, sizeof(T));
+#ifdef _WIN32
+            return bool(sizeof(T));
+#else
+            return sizeof(T);
+#endif
         }
-
-        return std::fread(&object, sizeof(T), 1, file) == 1;
+        return IsOpen() ? std::fread(&object, sizeof(T), 1, file) == 1 : false;
     }
 
     /**
-     * Writes a T object to a file sequentially.
-     * This function writes from the current position of the file pointer and
-     * advances it by the sizeof(T) bytes successfully written.
-     *
-     * Failures occur when:
-     * - The file is not open
-     * - The opened file lacks write permissions
-     *
-     * @tparam T Data type
-     *
-     * @param object Const reference to object
-     *
-     * @returns True if the object is successfully written to the file, false otherwise.
-     */
+    * Writes a T object to a file sequentially.
+    * This function writes from the current position of the file pointer and
+    * advances it by the sizeof(T) bytes successfully written.
+    *
+    * Failures occur when:
+    * - The file is not open
+    * - The opened file lacks write permissions
+    *
+    * @tparam T Data type
+    *
+    * @param object Const reference to object
+    *
+    * @returns True if the object is successfully written to the file, false otherwise.
+    */
     template <typename T>
     [[nodiscard]] bool WriteObject(const T& object) const {
         static_assert(std::is_trivially_copyable_v<T>, "Data type must be trivially copyable.");
         static_assert(!std::is_pointer_v<T>, "T must not be a pointer to an object.");
-
-        if (!IsOpen()) {
-            return false;
+        if (IsMappedFile()) {
+            std::memcpy(mmap_base + mmap_offset, &object, sizeof(T));
+#ifdef _WIN32
+            return sizeof(T) != 0;
+#else
+            return sizeof(T);
+#endif
         }
-
-        return std::fwrite(&object, sizeof(T), 1, file) == 1;
+        return IsOpen() ? std::fwrite(&object, sizeof(T), 1, file) == 1 : false;
     }
 
     /**
-     * Specialized function to read a string of a given length from a file sequentially.
-     * This function writes from the current position of the file pointer and
-     * advances it by the number of characters successfully read.
-     * The size of the returned string may not match length if not all bytes are successfully read.
-     *
-     * @param length Length of the string
-     *
-     * @returns A string read from the file.
-     */
+    * Specialized function to read a string of a given length from a file sequentially.
+    * This function writes from the current position of the file pointer and
+    * advances it by the number of characters successfully read.
+    * The size of the returned string may not match length if not all bytes are successfully read.
+    *
+    * @param length Length of the string
+    *
+    * @returns A string read from the file.
+    */
     [[nodiscard]] std::string ReadString(size_t length) const;
 
     /**
-     * Specialized function to write a string to a file sequentially.
-     * This function writes from the current position of the file pointer and
-     * advances it by the number of characters successfully written.
-     *
-     * @param string Span of const char backed std::string or std::string_view
-     *
-     * @returns Number of characters successfully written.
-     */
+    * Specialized function to write a string to a file sequentially.
+    * This function writes from the current position of the file pointer and
+    * advances it by the number of characters successfully written.
+    *
+    * @param string Span of const char backed std::string or std::string_view
+    *
+    * @returns Number of characters successfully written.
+    */
     [[nodiscard]] size_t WriteString(std::span<const char> string) const;
 
     /**
-     * Attempts to flush any unwritten buffered data into the file.
-     *
-     * @returns True if the flush was successful, false otherwise.
-     */
+    * Attempts to flush any unwritten buffered data into the file.
+    *
+    * @returns True if the flush was successful, false otherwise.
+    */
     bool Flush() const;
 
     /**
-     * Attempts to commit the file into the disk.
-     * Note that this is an expensive operation as this forces the operating system to write
-     * the contents of the file associated with the file descriptor into the disk.
-     *
-     * @returns True if the commit was successful, false otherwise.
-     */
+    * Attempts to commit the file into the disk.
+    * Note that this is an expensive operation as this forces the operating system to write
+    * the contents of the file associated with the file descriptor into the disk.
+    *
+    * @returns True if the commit was successful, false otherwise.
+    */
     bool Commit() const;
 
     /**
-     * Resizes the file to a given size.
-     * If the file is resized to a smaller size, the remainder of the file is discarded.
-     * If the file is resized to a larger size, the new area appears as if zero-filled.
-     *
-     * Failures occur when:
-     * - The file is not open
-     *
-     * @param size File size in bytes
-     *
-     * @returns True if the file resize succeeded, false otherwise.
-     */
+    * Resizes the file to a given size.
+    * If the file is resized to a smaller size, the remainder of the file is discarded.
+    * If the file is resized to a larger size, the new area appears as if zero-filled.
+    *
+    * Failures occur when:
+    * - The file is not open
+    *
+    * @param size File size in bytes
+    *
+    * @returns True if the file resize succeeded, false otherwise.
+    */
     [[nodiscard]] bool SetSize(u64 size) const;
 
     /**
-     * Gets the size of the file.
-     *
-     * Failures occur when:
-     * - The file is not open
-     *
-     * @returns The file size in bytes of the file. Returns 0 on failure.
-     */
+    * Gets the size of the file.
+    *
+    * Failures occur when:
+    * - The file is not open
+    *
+    * @returns The file size in bytes of the file. Returns 0 on failure.
+    */
     [[nodiscard]] u64 GetSize() const;
 
     /**
-     * Moves the current position of the file pointer with the specified offset and seek origin.
-     *
-     * @param offset Offset from seek origin
-     * @param origin Seek origin
-     *
-     * @returns True if the file pointer has moved to the specified offset, false otherwise.
-     */
+    * Moves the current position of the file pointer with the specified offset and seek origin.
+    *
+    * @param offset Offset from seek origin
+    * @param origin Seek origin
+    *
+    * @returns True if the file pointer has moved to the specified offset, false otherwise.
+    */
     [[nodiscard]] bool Seek(s64 offset, SeekOrigin origin = SeekOrigin::SetOrigin) const;
 
     /**
-     * Gets the current position of the file pointer.
-     *
-     * @returns The current position of the file pointer.
-     */
+    * Gets the current position of the file pointer.
+    *
+    * @returns The current position of the file pointer.
+    */
     [[nodiscard]] s64 Tell() const;
 
-private:
+#ifdef _WIN32
+    inline bool IsMappedFile() const noexcept { return mapping_handle != nullptr; }
+#else // POSIX
+    inline bool IsMappedFile() const noexcept { return mmap_fd != -1; }
+#endif
+
     std::filesystem::path file_path;
     FileAccessMode file_access_mode{};
     FileType file_type{};
-
     std::FILE* file = nullptr;
+    // Any decent system should have mmap() for files
+    // Systems with artifical mmap() limitations should simply change the logic within file.cpp
+    // and reduce the threshold for which the mmap() is set to
+#ifdef _WIN32
+    void *mapping_handle = nullptr;
+    void *file_handle = nullptr;
+#else // POSIX
+    int mmap_fd = -1;
+#endif
+    u8* mmap_base = nullptr;
+    size_t mmap_size = 0;
+    mutable s64 mmap_offset = 0; // fuck you
 };
 
 } // namespace Common::FS

src/common/net/net.cpp

@@ -241,7 +241,7 @@ std::optional<std::string> MakeRequest(const std::string& url, const std::string
                       response.status);
             return {};
         }
-        if (!response.has_header("content-type")) {
+        if (!response.headers.contains("content-type")) {
             LOG_ERROR(Common, "GET to {}{} returned no content", url, path);
             return {};
         }

src/core/internal_network/wifi_scanner.cpp

@@ -114,13 +114,13 @@ std::vector<Network::ScanData> ScanWifiNetworks(std::chrono::milliseconds deadli
     char ifname[IFNAMSIZ] = {0};
     char *args[1] = {ifname};
 
-    iw_enum_devices(sock, [](int f_skfd, char* f_ifname, char* f_args[], int) -> int {
+    iw_enum_devices(sock, [](int skfd, char* ifname, char* args[], int count) -> int {
         iwrange range;
-        int res = iw_get_range_info(f_skfd, f_ifname, &range);
-        LOG_INFO(Network, "ifname {} returned {} on iw_get_range_info", f_ifname, res);
+        int res = iw_get_range_info(skfd, ifname, &range);
+        LOG_INFO(Network, "ifname {} returned {} on iw_get_range_info", ifname, res);
         if (res >= 0) {
-            strncpy(f_args[0], f_ifname, IFNAMSIZ - 1);
-            f_args[0][IFNAMSIZ - 1] = 0;
+            strncpy(args[0], ifname, IFNAMSIZ - 1);
+            args[0][IFNAMSIZ - 1] = 0;
             return 1;
         }
         return 0;

src/yuzu/updater/update_dialog.cpp

@@ -74,7 +74,6 @@ UpdateDialog::~UpdateDialog() {
     delete ui;
 }
 
-// TODO: migrate to a net.cpp wrapper
 void UpdateDialog::Download() {
     const auto filename = QtCommon::Frontend::GetSaveFileName(
         tr("New Version Location"),
@@ -162,7 +161,7 @@ void UpdateDialog::Download() {
                                               QString::number(response.status)));
         return;
     }
-    if (!response.has_header("content-type")) {
+    if (!response.headers.contains("content-type")) {
         LOG_ERROR(Frontend, "GET to {}{} returned no content", m_asset.url, m_asset.path);
         return;
     }