Create function to read just the rom header so the rom list loads up way quicker (instantaneous on my shitty work laptop)

src/backend/core/Mem.cpp

@@ -90,6 +90,31 @@ FORCE_INLINE void SetROMCIC(u32 checksum, ROM &rom) {
     }
 }
 
+ROMHeader Mem::ReadROMHeader(bool isArchive, const std::string &filename) {
+    ROMHeader res;
+
+    u32 endianness;
+
+    std::vector<u8> buf{};
+    if (isArchive) {
+        buf = Util::ExtractROMHeaderFromArchive(filename);
+    } else {
+        buf = Util::OpenROMHeader(filename);
+    }
+
+    endianness = std::byteswap(ircolib::read_access<u32>(buf, 0));
+    Util::SwapN64Rom<true>(buf, endianness);
+    memcpy(&res, buf.data(), sizeof(ROMHeader));
+
+    res.clockRate = std::byteswap(res.clockRate);
+    res.programCounter = std::byteswap(res.programCounter);
+    res.release = std::byteswap(res.release);
+    res.unknown = std::byteswap(res.unknown);
+    res.unknown2 = std::byteswap(res.unknown2);
+
+    return res;
+}
+
 ROM Mem::LoadROM(const bool isArchive, const std::string &filename) {
     ROM res;
     res.cart.resize(CART_SIZE);
@@ -99,7 +124,7 @@ ROM Mem::LoadROM(const bool isArchive, const std::string &filename) {
         size_t sizeAdjusted;
         std::vector<u8> buf{};
         if (isArchive) {
-            buf = Util::OpenArchive(filename, sizeAdjusted);
+            buf = Util::ExtractROMFromArchive(filename, sizeAdjusted);
         } else {
             buf = Util::OpenROM(filename, sizeAdjusted);
         }
@@ -108,10 +133,8 @@ ROM Mem::LoadROM(const bool isArchive, const std::string &filename) {
         Util::SwapN64Rom<true>(buf, endianness);
 
         std::ranges::copy(buf, res.cart.begin());
-        res.mask = sizeAdjusted - 1;
         memcpy(&res.header, buf.data(), sizeof(ROMHeader));
     }
-    memcpy(res.gameNameCart, res.header.imageName, sizeof(res.header.imageName));
 
     res.header.clockRate = std::byteswap(res.header.clockRate);
     res.header.programCounter = std::byteswap(res.header.programCounter);
@@ -119,15 +142,6 @@ ROM Mem::LoadROM(const bool isArchive, const std::string &filename) {
     res.header.unknown = std::byteswap(res.header.unknown);
     res.header.unknown2 = std::byteswap(res.header.unknown2);
 
-    res.code[0] = res.header.categoryCode;
-    res.code[1] = res.header.uniqueCode[0];
-    res.code[2] = res.header.uniqueCode[1];
-    res.code[3] = '\0';
-
-    for (int i = sizeof(res.header.imageName) - 1; res.gameNameCart[i] == ' '; i--) {
-        res.gameNameCart[i] = '\0';
-    }
-
     const u32 checksum = SDL_crc32(0, &res.cart[0x40], 0x9C0);
     SetROMCIC(checksum, res);
     endianness = std::byteswap(ircolib::read_access<u32>(res.cart, 0));