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(AVC.DatOpener): try out several predefined schemes.
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morkt
parent
c79ba1d469
commit
e1c2d0f2ce
@ -34,10 +34,12 @@ namespace GameRes.Formats.AVC
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public class ArchiveFile : ArcFile
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{
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public readonly byte[] Key;
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public readonly int HeaderOffset;
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public ArchiveFile (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte[] key)
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public ArchiveFile (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, int offset, byte[] key)
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: base (arc, impl, dir)
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{
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HeaderOffset = offset;
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Key = key;
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}
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}
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@ -56,61 +58,13 @@ namespace GameRes.Formats.AVC
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Extensions = new string[] { "dat" };
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}
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private static readonly string ArchiveKey = "SETSUEI-";
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public override ArcFile TryOpen (ArcView file)
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{
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var header = new byte[0x34];
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if (0x34 != file.View.Read (0, header, 0, 0x34))
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var reader = new AdvReader (file);
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var dir = reader.GetIndex();
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if (null == dir)
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return null;
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var key = new byte[8];
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/*
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for (int i = 0; i < 8; ++i)
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header[8+i] ^= (byte)ArchiveKey[i];
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for (int i = 0; i < 0x24; ++i)
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header[0x10+i] ^= header[8+(i&7)];
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if (!Binary.AsciiEqual (header, 0x10, "ARCHIVE"))
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return null;
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Buffer.BlockCopy (header, 8, key, 0, 8);
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*/
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for (int i = 0; i < 8; ++i)
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key[i] = (byte)(header[0x10+i] ^ "ARCHIVE\0"[i]);
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for (int i = 9; i < 0x24; ++i)
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header[0x10+i] ^= key[i&7];
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int index_offset = LittleEndian.ToInt32 (header, 0x20);
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int count = LittleEndian.ToInt32 (header, 0x24);
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if (index_offset < 0x24 || index_offset >= file.MaxOffset || count <= 0 || count > 0xfffff)
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return null;
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var index = new byte[0x114 * count];
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int index_size = file.View.Read (index_offset+0x10, index, 0, (uint)index.Length);
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count = index_size / 0x114;
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if (count * 0x114 != index_size)
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return null;
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for (int i = 0; i < index_size; ++i)
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index[i] ^= key[(index_offset+i)&7];
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var dir = new List<Entry> (count);
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index_offset = 0;
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for (int i = 0; i < count; ++i)
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{
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if (0 != index[index_offset++])
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return null;
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int name_length = 0;
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while (name_length < 0x100 && 0 != index[index_offset+name_length])
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name_length++;
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if (0 == name_length)
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{
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index_offset += 0x113;
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continue;
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}
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var name = Encodings.cp932.GetString (index, index_offset, name_length);
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var entry = FormatCatalog.Instance.CreateEntry (name);
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index_offset += 0x107;
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entry.Offset = 0x10 + LittleEndian.ToUInt32 (index, index_offset);
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entry.Size = LittleEndian.ToUInt32 (index, index_offset+4);
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index_offset += 0x0c;
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dir.Add (entry);
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}
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return new ArchiveFile (file, this, dir, key);
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return new ArchiveFile (file, this, dir, reader.HeaderOffset, reader.Key);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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@ -120,10 +74,121 @@ namespace GameRes.Formats.AVC
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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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int base_offset = (int)(entry.Offset-0x10);
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int base_offset = (int)(entry.Offset-arcf.HeaderOffset);
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for (int i = 0; i < data.Length; ++i)
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data[i] ^= arcf.Key[((base_offset+i)&7)];
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return new MemoryStream (data, false);
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}
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internal class AdvReader
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{
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ArcView m_file;
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byte[] m_header = new byte[0x80];
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byte[] m_key = new byte[8];
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byte[] m_index;
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int m_index_offset;
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int m_count;
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int m_header_offset;
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public byte[] Key { get { return m_key; } }
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public int HeaderOffset { get { return m_header_offset; } }
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public AdvReader (ArcView file)
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{
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m_file = file;
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}
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public List<Entry> GetIndex ()
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{
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if (m_header.Length != m_file.View.Read (0, m_header, 0, (uint)m_header.Length))
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return null;
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foreach (var scheme in KnownSchemes)
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{
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if (!ReadIndex (scheme.KeyOffset, scheme.HeaderOffset))
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continue;
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try
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{
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var dir = ParseIndex();
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if (null != dir)
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return dir;
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}
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catch { /* ignore parse errors */ }
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}
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return null;
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}
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bool ReadIndex (int key_offset, int header_offset)
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{
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// placing predefined string into XORed file is a very smart move
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for (int i = 0; i < 8; ++i)
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{
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var symbol = m_header[header_offset+i] ^ "ARCHIVE\0"[i];
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var check = m_header[key_offset+i] ^ symbol;
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if (check < 0x20 || check > 0x7e)
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return false;
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Key[i] = (byte)symbol;
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}
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for (int i = 0x10; i < 0x24; ++i)
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m_header[header_offset+i] ^= Key[i&7];
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int entry_size = LittleEndian.ToInt32 (m_header, header_offset+0x14);
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if (0x114 != entry_size)
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return false;
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m_index_offset = LittleEndian.ToInt32 (m_header, header_offset+0x10);
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m_count = LittleEndian.ToInt32 (m_header, header_offset+0x20);
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if (m_index_offset < 0x24 || (long)m_index_offset+header_offset >= m_file.MaxOffset
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|| m_count <= 0 || m_count > 0xffff)
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return false;
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int index_size = 0x114 * m_count;
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if (null == m_index || m_index.Length < index_size)
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m_index = new byte[index_size];
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if (index_size != m_file.View.Read (m_index_offset+header_offset, m_index, 0, (uint)index_size))
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return false;
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m_header_offset = header_offset;
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return true;
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}
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List<Entry> ParseIndex()
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{
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for (int i = 0; i < 0x114 * m_count; ++i)
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m_index[i] ^= Key[(m_index_offset+i)&7];
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var dir = new List<Entry> (m_count);
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int index_offset = 0;
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for (int i = 0; i < m_count; ++i)
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{
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if (0 != m_index[index_offset++])
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return null;
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int name_length = 0;
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while (name_length < 0x100 && 0 != m_index[index_offset+name_length])
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name_length++;
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if (0 == name_length)
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{
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index_offset += 0x113;
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continue;
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}
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var name = Encodings.cp932.GetString (m_index, index_offset, name_length);
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var entry = FormatCatalog.Instance.CreateEntry (name);
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index_offset += 0x107;
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entry.Offset = m_header_offset + LittleEndian.ToUInt32 (m_index, index_offset);
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entry.Size = LittleEndian.ToUInt32 (m_index, index_offset+4);
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index_offset += 0x0c;
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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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internal class Scheme
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{
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public string Password;
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public int KeyOffset;
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public int HeaderOffset;
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};
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private static readonly Scheme[] KnownSchemes = new Scheme[] {
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new Scheme { Password="SETSUEI-", KeyOffset=0x08, HeaderOffset=0x10 }, // Setsuei
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new Scheme { Password="CHOKOPAI", KeyOffset=0x35, HeaderOffset=0x51 }, // Chokotto*Vampire!
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new Scheme { Password="ClOVeRrE", KeyOffset=0x11, HeaderOffset=0x46 }, // Clover Point
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new Scheme { Password="-AYASEKE", KeyOffset=0x0c, HeaderOffset=0x15 }, // Ayase Ke no Onna
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};
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}
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}
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}
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