Merge branch 'ba2' into 'master'

BA2 support fixes

See merge request OpenMW/openmw!4055

components/bsa/ba2dx10file.cpp

@@ -113,19 +113,29 @@ namespace Bsa
             input.read(reinterpret_cast<char*>(header), 16);
             input.read(reinterpret_cast<char*>(&fileTableOffset), 8);
 
-            if (header[0] == 0x00415342) /*"BSA\x00"*/
-                fail("Unrecognized compressed BSA format");
+            if (header[0] != ESM::fourCC("BTDX"))
+                fail("Unrecognized BA2 signature");
             mVersion = header[1];
-            if (mVersion != 0x01 /*FO4*/ && mVersion != 0x02 /*Starfield*/)
-                fail("Unrecognized compressed BSA version");
-
-            type = header[2];
-            fileCount = header[3];
-            if (mVersion == 0x02)
+            switch (static_cast<BA2Version>(mVersion))
             {
+                case BA2Version::Fallout4:
+                case BA2Version::Fallout4NextGen_v7:
+                case BA2Version::Fallout4NextGen_v8:
+                    break;
+                case BA2Version::StarfieldDDS:
                     uint64_t dummy;
                     input.read(reinterpret_cast<char*>(&dummy), 8);
+                    uint32_t compressionMethod;
+                    input.read(reinterpret_cast<char*>(&compressionMethod), 4);
+                    if (compressionMethod == 3)
+                        fail("Unsupported LZ4-compressed DDS BA2");
+                    break;
+                default:
+                    fail("Unrecognized DDS BA2 version");
             }
+
+            type = header[2];
+            fileCount = header[3];
         }
 
         if (type == ESM::fourCC("DX10"))

components/bsa/ba2file.hpp

@@ -8,6 +8,15 @@ namespace Bsa
 {
     uint32_t generateHash(const std::string& name);
     uint32_t generateExtensionHash(std::string_view extension);
+
+    enum class BA2Version : std::uint32_t
+    {
+        Fallout4 = 1,
+        StarfieldGeneral = 2,
+        StarfieldDDS = 3,
+        Fallout4NextGen_v7 = 7,
+        Fallout4NextGen_v8 = 8,
+    };
 }
 
 #endif

components/bsa/ba2gnrlfile.cpp

@@ -107,19 +107,25 @@ namespace Bsa
             input.read(reinterpret_cast<char*>(header), 16);
             input.read(reinterpret_cast<char*>(&fileTableOffset), 8);
 
-            if (header[0] == 0x00415342) /*"BSA\x00"*/
-                fail("Unrecognized compressed BSA format");
+            if (header[0] != ESM::fourCC("BTDX"))
+                fail("Unrecognized BA2 signature");
             mVersion = header[1];
-            if (mVersion != 0x01 /*FO4*/ && mVersion != 0x02 /*Starfield*/)
-                fail("Unrecognized compressed BSA version");
-
-            type = header[2];
-            fileCount = header[3];
-            if (mVersion == 0x02)
+            switch (static_cast<BA2Version>(mVersion))
             {
+                case BA2Version::Fallout4:
+                case BA2Version::Fallout4NextGen_v7:
+                case BA2Version::Fallout4NextGen_v8:
+                    break;
+                case BA2Version::StarfieldGeneral:
                     uint64_t dummy;
                     input.read(reinterpret_cast<char*>(&dummy), 8);
+                    break;
+                default:
+                    fail("Unrecognized general BA2 version");
             }
+
+            type = header[2];
+            fileCount = header[3];
         }
 
         if (type == ESM::fourCC("GNRL"))

components/bsa/bsa_file.cpp

@@ -340,17 +340,17 @@ BsaVersion Bsa::BSAFile::detectVersion(const std::filesystem::path& filePath)
         return BsaVersion::Uncompressed;
     }
 
-    if (head[0] == static_cast<uint32_t>(BsaVersion::Compressed) || head[0] == ESM::fourCC("BTDX"))
+    if (head[0] == static_cast<uint32_t>(BsaVersion::Compressed))
     {
-        if (head[1] == static_cast<uint32_t>(0x01))
+        return BsaVersion::Compressed;
+    }
+
+    if (head[0] == ESM::fourCC("BTDX"))
     {
         if (head[2] == ESM::fourCC("GNRL"))
             return BsaVersion::BA2GNRL;
         if (head[2] == ESM::fourCC("DX10"))
             return BsaVersion::BA2DX10;
-            return BsaVersion::Unknown;
-        }
-        return BsaVersion::Compressed;
     }
 
     return BsaVersion::Unknown;