补上缺失的script加密代码

TmrHiroRepack/Program.cs

@@ -63,7 +63,21 @@ namespace TmrHiroRepack
             Encoding? shiftJis = provider.GetEncoding("shift-jis");
             string[] files = Directory.GetFiles(folderPath);
             short count = (short)files.Length; //文件数量
-            byte name_length = 0x16; //文件名长度(貌似固定16?)
+            string[] extensions = [".ogg", ".grd", ".srp"]; //需要移除的文件后缀，因为这是Garbro添加的
+            int max_name_length = 0;
+            foreach (string file in files)
+            {
+                string fileName = Path.GetFileName(file);
+                foreach (var extension in extensions)
+                {
+                    if (fileName.EndsWith(extension, StringComparison.OrdinalIgnoreCase))
+                    {
+                        fileName = fileName[..^extension.Length];
+                    }
+                }
+                max_name_length = Math.Max(max_name_length, shiftJis.GetBytes(fileName).Length);
+            }
+            byte name_length = (byte)max_name_length; //文件名长度,每个封包值都不同
             uint data_offset;
             if (version == 1)
                 data_offset = 7 + ((uint)name_length + 8) * (uint)count; //Data区偏移
@@ -72,8 +86,7 @@ namespace TmrHiroRepack
             else
                 throw new Exception("Invalid Version");
             long offset = 0; //Index区偏移
-            List<Index> indexs = new();
-            string[] extensions = { ".ogg", ".grd", ".srp" }; //需要移除的文件后缀，因为这是Garbro添加的
+            List<Index> indexs = [];
             foreach (string file in files)
             {
                 Index i = new();
@@ -85,8 +98,6 @@ namespace TmrHiroRepack
                     if (fileName.EndsWith(extension, StringComparison.OrdinalIgnoreCase))
                     {
                         fileName = fileName[..^extension.Length];
-                        if (shiftJis.GetBytes(fileName).Length > name_length)
-                            throw new Exception("Something Wrong, File name too long");
                     }
                 }
                 i.name = fileName;
@@ -112,36 +123,55 @@ namespace TmrHiroRepack
             }
             //准备开写
             string outputPath = Path.Combine(Path.GetDirectoryName(folderPath), Path.GetFileName(folderPath) + ".pac");
-            using (FileStream fs = new(outputPath, FileMode.Create))
-            using (BinaryWriter bw = new(fs))
+            using FileStream fs = new(outputPath, FileMode.Create);
+            using BinaryWriter bw = new(fs);
+            bw.Write(count);//文件数量
+            bw.Write(name_length);//文件名长度
+            bw.Write(data_offset);//Data区偏移
+            foreach (Index i in indexs)
             {
-                bw.Write(count);//文件数量
-                bw.Write(name_length);//文件名长度
-                bw.Write(data_offset);//Data区偏移
-                foreach (Index i in indexs)
+                byte[] name = new byte[name_length];
+                Array.Copy(shiftJis.GetBytes(i.name), name, shiftJis.GetBytes(i.name).Length);
+                bw.Write(name);//文件名
+                if (version == 1)
                 {
-                    byte[] name = new byte[name_length];
-                    Array.Copy(shiftJis.GetBytes(i.name), name, shiftJis.GetBytes(i.name).Length);
-                    bw.Write(name);//文件名
-                    if (version == 1)
-                    {
-                        bw.Write(i.entryInfoV1.entryOffset);//文件偏移
-                        bw.Write(i.entryInfoV1.entrySize);//文件大小
-                    }
-                    else if (version == 2)
-                    {
-                        bw.Write(i.entryInfoV2.entryOffset);//文件偏移
-                        bw.Write(i.entryInfoV2.entrySize);//文件大小
-                    }
+                    bw.Write(i.entryInfoV1.entryOffset);//文件偏移
+                    bw.Write(i.entryInfoV1.entrySize);//文件大小
                 }
-                foreach (string file in files)
+                else if (version == 2)
                 {
-                    using (FileStream fs2 = new(file, FileMode.Open))
-                    {
-                        fs2.CopyTo(fs);
-                    }
+                    bw.Write(i.entryInfoV2.entryOffset);//文件偏移
+                    bw.Write(i.entryInfoV2.entrySize);//文件大小
                 }
             }
+            foreach (string file in files)
+            {
+                //检查是否是脚本文件(文件后缀.srp)
+                if (Path.GetExtension(file) == ".srp") // Script file detected
+                {
+                    byte[] DecryptData = File.ReadAllBytes(file);
+                    uint offset2 = 0;
+                    int record_count = BitConverter.ToInt32(DecryptData, (int)offset2);
+                    offset2 += 4;
+                    for (int i = 0; i < record_count; i++)
+                    {
+                        ushort chunk_size = (ushort)(BitConverter.ToUInt16(DecryptData, (int)offset2) - 4); //我知道这里有潜在的问题，但我不相信哪个游戏单个script文件有2G
+                        offset2 += 6;
+                        for (int j = 0; j < chunk_size; j++)
+                        {
+                            DecryptData[offset2] = Utils.RotByteL(DecryptData[offset2], 4);
+                            offset2++;
+                        }
+                    }
+                    bw.Write(DecryptData);
+                }
+                else
+                {
+                    using FileStream fs2 = new(file, FileMode.Open);
+                    fs2.CopyTo(fs);
+                }
+
+            }
             return true;
         }
     }

TmrHiroRepack/Utils.cs

@@ -122,5 +122,17 @@ namespace TmrHiroRepack
                 _ => throw new NotSupportedException($"Unsupported column Size: {v}"),
             };
         }
+
+        public static byte RotByteR(byte v, int count)
+        {
+            count &= 7;
+            return (byte)(v >> count | v << (8 - count));
+        }
+
+        public static byte RotByteL(byte v, int count)
+        {
+            count &= 7;
+            return (byte)(v << count | v >> (8 - count));
+        }
     }
 }

note/pac结构.txt

@@ -0,0 +1,28 @@
+count		short	2B
+name_length	uint	1B
+data_offset	uint	4B
+
+如果data_offset=7+(name_length+8)*count ->v1
+如果data_offset=7+(name_length+12)*count ->v2
+
+index_offset=7
+
+[ INDEX
+name		*string	name_length
+{ v1
+entryOffset	uint	4B (+data_offset *相对整个文件而言)
+entrySize	uint	4B
+}
+{ v2
+entryOffset	long	8B (+data_offset *同上)
+entrySize	uint	4B
+}
+]
+
+[ DATA
+]
+
+文件处理
+.ogg/.grd/.srp全部去掉
+
+