Add in NCCH, TMD and SMDH from Citra (to get game title)

src/core/ncch/smdh.cpp

@@ -0,0 +1,110 @@
+// Copyright 2016 Citra Emulator Project / 2019 threeSD Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <cstring>
+#include <vector>
+#include "common/common_types.h"
+#include "core/ncch/smdh.h"
+
+namespace Core {
+
+constexpr u32 MakeMagic(char a, char b, char c, char d) {
+    return a | b << 8 | c << 16 | d << 24;
+}
+
+// 8x8 Z-Order coordinate from 2D coordinates
+static constexpr u32 MortonInterleave(u32 x, u32 y) {
+    constexpr u32 xlut[] = {0x00, 0x01, 0x04, 0x05, 0x10, 0x11, 0x14, 0x15};
+    constexpr u32 ylut[] = {0x00, 0x02, 0x08, 0x0a, 0x20, 0x22, 0x28, 0x2a};
+    return xlut[x % 8] + ylut[y % 8];
+}
+
+/**
+ * Calculates the offset of the position of the pixel in Morton order
+ */
+static inline u32 GetMortonOffset(u32 x, u32 y, u32 bytes_per_pixel) {
+    // Images are split into 8x8 tiles. Each tile is composed of four 4x4 subtiles each
+    // of which is composed of four 2x2 subtiles each of which is composed of four texels.
+    // Each structure is embedded into the next-bigger one in a diagonal pattern, e.g.
+    // texels are laid out in a 2x2 subtile like this:
+    // 2 3
+    // 0 1
+    //
+    // The full 8x8 tile has the texels arranged like this:
+    //
+    // 42 43 46 47 58 59 62 63
+    // 40 41 44 45 56 57 60 61
+    // 34 35 38 39 50 51 54 55
+    // 32 33 36 37 48 49 52 53
+    // 10 11 14 15 26 27 30 31
+    // 08 09 12 13 24 25 28 29
+    // 02 03 06 07 18 19 22 23
+    // 00 01 04 05 16 17 20 21
+    //
+    // This pattern is what's called Z-order curve, or Morton order.
+
+    const unsigned int block_height = 8;
+    const unsigned int coarse_x = x & ~7;
+
+    u32 i = MortonInterleave(x, y);
+
+    const unsigned int offset = coarse_x * block_height;
+
+    return (i + offset) * bytes_per_pixel;
+}
+
+bool IsValidSMDH(const std::vector<u8>& smdh_data) {
+    if (smdh_data.size() < sizeof(Core::SMDH))
+        return false;
+
+    u32 magic;
+    memcpy(&magic, smdh_data.data(), sizeof(u32));
+
+    return MakeMagic('S', 'M', 'D', 'H') == magic;
+}
+
+std::vector<u16> SMDH::GetIcon(bool large) const {
+    u32 size;
+    const u8* icon_data;
+
+    if (large) {
+        size = 48;
+        icon_data = large_icon.data();
+    } else {
+        size = 24;
+        icon_data = small_icon.data();
+    }
+
+    std::vector<u16> icon(size * size);
+    for (u32 x = 0; x < size; ++x) {
+        for (u32 y = 0; y < size; ++y) {
+            u32 coarse_y = y & ~7;
+            const u8* pixel = icon_data + GetMortonOffset(x, y, 2) + coarse_y * size * 2;
+            icon[x + size * y] = (pixel[1] << 8) + pixel[0];
+        }
+    }
+    return icon;
+}
+
+std::array<u16, 0x40> SMDH::GetShortTitle(Core::SMDH::TitleLanguage language) const {
+    return titles[static_cast<int>(language)].short_title;
+}
+
+std::vector<SMDH::GameRegion> SMDH::GetRegions() const {
+    if (region_lockout == 0x7fffffff) {
+        return std::vector<GameRegion>{GameRegion::RegionFree};
+    }
+
+    constexpr u32 REGION_COUNT = 7;
+    std::vector<GameRegion> result;
+    for (u32 region = 0; region < REGION_COUNT; ++region) {
+        if (region_lockout & (1 << region)) {
+            result.push_back(static_cast<GameRegion>(region));
+        }
+    }
+
+    return result;
+}
+
+} // namespace Core