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https://github.com/crskycode/GARbro.git
synced 2026-07-08 01:30:18 +08:00
implemented older versions of Xuse archives.
This commit is contained in:
morkt
@@ -55,151 +55,42 @@ namespace GameRes.Formats.Xuse
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public WagOpener ()
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{
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Extensions = new string[] { "wag", "4ag" };
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Extensions = new string[] { "wag", "4ag", "004" };
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Signatures = new uint[] { 0x40474157, 0x34464147 }; // 'GAF4'
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (0x0300 != file.View.ReadUInt16 (4))
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int version = file.View.ReadUInt16 (4);
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if (0x300 != version && 0x200 != version)
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return null;
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int count = file.View.ReadInt32 (0x46);
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if (!IsSaneCount (count))
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return null;
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byte[] title = file.View.ReadBytes (6, 0x40);
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if (0x40 != title.Length)
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var reader = new IndexReader (file, version, count);
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var dir = reader.ReadIndex();
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if (null == dir)
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return null;
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int title_length = Array.IndexOf<byte> (title, 0);
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if (-1 == title_length)
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title_length = title.Length;
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string arc_filename = Path.GetFileName (file.Name).ToLowerInvariant();
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byte[] bin_filename = Encodings.cp932.GetBytes (arc_filename);
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byte[] name_key = GenerateKey (bin_filename);
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uint key_sum = (uint)name_key.Select (x => (int)x).Sum();
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uint index_offset = 0x200 + key_sum;
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for (int i = 0; i < name_key.Length; ++i)
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{
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index_offset ^= name_key[i];
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index_offset = Binary.RotR (index_offset, 1);
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}
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for (int i = 0; i < name_key.Length; ++i)
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{
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index_offset ^= name_key[i];
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index_offset = Binary.RotR (index_offset, 1);
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}
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index_offset %= 0x401;
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index_offset += 0x4A;
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byte[] index = file.View.ReadBytes (index_offset, (uint)(4*count));
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if (index.Length != 4*count)
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return null;
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byte[] index_key = new byte[index.Length];
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for (int i = 0; i < index_key.Length; ++i)
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{
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int v = name_key[(i+1) % name_key.Length] ^ (name_key[i % name_key.Length] + (i & 0xFF));
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index_key[i] = (byte)(count + v);
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}
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Decrypt (index_offset, index_key, index);
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var dir = new List<Entry> (count);
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int current_offset = 0;
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uint next_offset = LittleEndian.ToUInt32 (index, current_offset);
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byte[] data_key = GenerateKey (title, title_length);
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string base_filename = Path.GetFileNameWithoutExtension (arc_filename);
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byte[] chunk_buf = new byte[8];
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byte[] filename_buf = new byte[0x40];
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for (int i = 0; i < count; ++i)
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{
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current_offset += 4;
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uint entry_offset = next_offset;
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if (entry_offset >= file.MaxOffset)
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return null;
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if (i + 1 == count)
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next_offset = (uint)file.MaxOffset;
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else
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next_offset = LittleEndian.ToUInt32 (index, current_offset);
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uint entry_size = next_offset - entry_offset;
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if (8 != file.View.Read (entry_offset, chunk_buf, 0, 8))
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return null;
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Decrypt (entry_offset, data_key, chunk_buf);
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if (!Binary.AsciiEqual (chunk_buf, "DSET"))
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return null;
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uint chunk_offset = entry_offset + 10;
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int chunk_count = LittleEndian.ToInt32 (chunk_buf, 4);
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string filename = null;
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string type = null;
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for (int chunk = 0; chunk < chunk_count; ++chunk)
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{
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if (8 != file.View.Read (chunk_offset, chunk_buf, 0, 8))
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return null;
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Decrypt (chunk_offset, data_key, chunk_buf);
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int chunk_size = LittleEndian.ToInt32 (chunk_buf, 4);
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if (chunk_size <= 0)
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return null;
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if (Binary.AsciiEqual (chunk_buf, "PICT"))
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{
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if (null == type)
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{
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type = "image";
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entry_offset = chunk_offset + 0x10;
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entry_size = (uint)chunk_size - 6;
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}
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}
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else if (null == filename && Binary.AsciiEqual (chunk_buf, "FTAG"))
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{
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if (chunk_size > filename_buf.Length)
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filename_buf = new byte[chunk_size];
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if (chunk_size != file.View.Read (chunk_offset+10, filename_buf, 0, (uint)chunk_size))
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return null;
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Decrypt (chunk_offset+10, data_key, filename_buf, 0, chunk_size-2);
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filename = Encodings.cp932.GetString (filename_buf, 0, chunk_size-2);
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}
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chunk_offset += 10 + (uint)chunk_size;
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}
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Entry entry;
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if (!string.IsNullOrEmpty (filename))
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{
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filename = DriveRe.Replace (filename, "");
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entry = FormatCatalog.Instance.Create<Entry> (filename);
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}
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else
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{
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entry = new Entry {
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Name = string.Format ("{0}#{1:D4}", base_filename, i),
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Type = type ?? ""
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};
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}
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entry.Offset = entry_offset;
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entry.Size = entry_size;
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dir.Add (entry);
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}
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return new WagArchive (file, this, dir, data_key);
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return new WagArchive (file, this, dir, reader.DataKey);
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}
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static readonly Regex DriveRe = new Regex (@"^(?:.+:)?\\+");
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var warc = arc as WagArchive;
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if (null == warc)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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var data = new byte[entry.Size];
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arc.File.View.Read (entry.Offset, data, 0, entry.Size);
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var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
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Decrypt ((uint)entry.Offset, warc.Key, data);
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return new MemoryStream (data);
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}
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private byte[] GenerateKey (byte[] keyword)
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static private byte[] GenerateKey (byte[] keyword)
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{
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return GenerateKey (keyword, keyword.Length);
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}
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private byte[] GenerateKey (byte[] keyword, int length)
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static private byte[] GenerateKey (byte[] keyword, int length)
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{
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int hash = 0;
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for (int i = 0; i < length; ++i)
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@@ -225,16 +116,175 @@ namespace GameRes.Formats.Xuse
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return key;
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}
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private void Decrypt (uint offset, byte[] key, byte[] index)
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static private void Decrypt (uint offset, byte[] key, byte[] index)
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{
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Decrypt (offset, key, index, 0, index.Length);
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}
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private void Decrypt (uint offset, byte[] key, byte[] index, int pos, int length)
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static private void Decrypt (uint offset, byte[] key, byte[] index, int pos, int length)
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{
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uint key_last = (uint)key.Length-1;
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for (uint i = 0; i < length; ++i)
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index[pos+i] ^= key[(offset + i) % key_last];
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}
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internal class IndexReader
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{
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ArcView m_file;
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int m_version;
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int m_count;
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byte[] m_data_key;
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public byte[] DataKey { get { return m_data_key; } }
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public IndexReader (ArcView file, int version, int count)
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{
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m_file = file;
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m_version = version;
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m_count = count;
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}
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byte[] m_chunk_buf = new byte[0x40];
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public List<Entry> ReadIndex ()
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{
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byte[] title = m_file.View.ReadBytes (6, 0x40);
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int title_length = Array.IndexOf<byte> (title, 0);
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if (-1 == title_length)
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title_length = title.Length;
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string arc_filename = Path.GetFileName (m_file.Name);
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if (0x200 != m_version)
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arc_filename = arc_filename.ToLowerInvariant();
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string base_filename = Path.GetFileNameWithoutExtension (arc_filename);
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byte[] name_key = GenerateKey (Encodings.cp932.GetBytes (arc_filename));
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uint index_offset = 0x200 + (uint)name_key.Select (x => (int)x).Sum();
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for (int i = 0; i < name_key.Length; ++i)
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{
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index_offset ^= name_key[i];
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index_offset = Binary.RotR (index_offset, 1);
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}
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for (int i = 0; i < name_key.Length; ++i)
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{
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index_offset ^= name_key[i];
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index_offset = Binary.RotR (index_offset, 1);
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}
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index_offset %= 0x401;
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index_offset += 0x4A;
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byte[] index = m_file.View.ReadBytes (index_offset, (uint)(4*m_count));
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if (index.Length != 4*m_count)
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return null;
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byte[] index_key = new byte[index.Length];
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for (int i = 0; i < index_key.Length; ++i)
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{
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int v = name_key[(i+1) % name_key.Length] ^ (name_key[i % name_key.Length] + i);
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index_key[i] = (byte)(m_count + v);
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}
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Decrypt (index_offset, index_key, index);
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m_data_key = GenerateKey (title, title_length);
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var dir = new List<Entry> (m_count);
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int current_offset = 0;
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uint next_offset = LittleEndian.ToUInt32 (index, current_offset);
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for (int i = 0; i < m_count; ++i)
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{
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current_offset += 4;
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uint entry_offset = next_offset;
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if (entry_offset >= m_file.MaxOffset)
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return null;
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if (i + 1 == m_count)
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next_offset = (uint)m_file.MaxOffset;
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else
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next_offset = LittleEndian.ToUInt32 (index, current_offset);
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uint entry_size = next_offset - entry_offset;
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var entry = ParseEntry (entry_offset, entry_size);
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if (string.IsNullOrEmpty (entry.Name))
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entry.Name = string.Format ("{0}#{1:D4}", base_filename, i);
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dir.Add (entry);
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}
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return dir;
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}
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Entry ParseEntry (uint entry_offset, uint entry_size)
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{
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ReadChunk (entry_offset, 8);
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if (0x200 == m_version)
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return ParseEntryV2 (entry_offset, entry_size);
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else
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return ParseEntryV3 (entry_offset, entry_size);
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}
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void ReadChunk (uint offset, int chunk_size)
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{
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if (chunk_size > m_chunk_buf.Length)
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m_chunk_buf = new byte[chunk_size];
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if (chunk_size != m_file.View.Read (offset, m_chunk_buf, 0, (uint)chunk_size))
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throw new InvalidFormatException();
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Decrypt (offset, m_data_key, m_chunk_buf, 0, chunk_size);
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}
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Entry ParseEntryV2 (uint entry_offset, uint entry_size)
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{
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var data_size = LittleEndian.ToUInt32 (m_chunk_buf, 0);
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if (data_size >= entry_size)
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throw new InvalidFormatException();
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var name_length = LittleEndian.ToInt32 (m_chunk_buf, 4);
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entry_offset += 0x10;
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var entry = new Entry();
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if (name_length > 0)
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{
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ReadChunk (entry_offset+data_size, name_length);
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if ('|' == m_chunk_buf[name_length-1])
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--name_length;
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entry.Name = Encodings.cp932.GetString (m_chunk_buf, 0, name_length);
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entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
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}
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entry.Offset = entry_offset;
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entry.Size = data_size;
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return entry;
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}
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Entry ParseEntryV3 (uint entry_offset, uint entry_size)
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{
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if (!Binary.AsciiEqual (m_chunk_buf, "DSET"))
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throw new InvalidFormatException();
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uint chunk_offset = entry_offset + 10;
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int chunk_count = LittleEndian.ToInt32 (m_chunk_buf, 4);
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var entry = new Entry();
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string filename = null;
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for (int chunk = 0; chunk < chunk_count; ++chunk)
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{
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ReadChunk (chunk_offset, 8);
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int chunk_size = LittleEndian.ToInt32 (m_chunk_buf, 4);
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if (chunk_size <= 0)
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throw new InvalidFormatException();
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if (Binary.AsciiEqual (m_chunk_buf, "PICT"))
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{
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if (string.IsNullOrEmpty (entry.Type))
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{
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entry.Type = "image";
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entry_offset = chunk_offset + 0x10;
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entry_size = (uint)chunk_size - 6;
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}
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}
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else if (null == filename && Binary.AsciiEqual (m_chunk_buf, "FTAG"))
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{
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ReadChunk (chunk_offset+10, chunk_size-2);
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filename = Encodings.cp932.GetString (m_chunk_buf, 0, chunk_size-2);
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}
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chunk_offset += 10 + (uint)chunk_size;
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}
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if (!string.IsNullOrEmpty (filename))
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entry.Name = DriveRe.Replace (filename, "");
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entry.Offset = entry_offset;
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entry.Size = entry_size;
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return entry;
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}
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static readonly Regex DriveRe = new Regex (@"^(?:.+:)?\\+");
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}
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}
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}
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