From e1c2d0f2ce2fe85c652f91aabcd5ff15b147e3e7 Mon Sep 17 00:00:00 2001 From: morkt Date: Tue, 14 Apr 2015 10:26:55 +0400 Subject: [PATCH] (AVC.DatOpener): try out several predefined schemes. --- ArcFormats/ArcAVC.cs | 173 +++++++++++++++++++++++++++++-------------- 1 file changed, 119 insertions(+), 54 deletions(-) diff --git a/ArcFormats/ArcAVC.cs b/ArcFormats/ArcAVC.cs index 3a78c358..0d9329f9 100644 --- a/ArcFormats/ArcAVC.cs +++ b/ArcFormats/ArcAVC.cs @@ -34,10 +34,12 @@ namespace GameRes.Formats.AVC public class ArchiveFile : ArcFile { public readonly byte[] Key; + public readonly int HeaderOffset; - public ArchiveFile (ArcView arc, ArchiveFormat impl, ICollection dir, byte[] key) + public ArchiveFile (ArcView arc, ArchiveFormat impl, ICollection dir, int offset, byte[] key) : base (arc, impl, dir) { + HeaderOffset = offset; Key = key; } } @@ -56,61 +58,13 @@ namespace GameRes.Formats.AVC Extensions = new string[] { "dat" }; } - private static readonly string ArchiveKey = "SETSUEI-"; - public override ArcFile TryOpen (ArcView file) { - var header = new byte[0x34]; - if (0x34 != file.View.Read (0, header, 0, 0x34)) + var reader = new AdvReader (file); + var dir = reader.GetIndex(); + if (null == dir) return null; - var key = new byte[8]; - /* - for (int i = 0; i < 8; ++i) - header[8+i] ^= (byte)ArchiveKey[i]; - for (int i = 0; i < 0x24; ++i) - header[0x10+i] ^= header[8+(i&7)]; - if (!Binary.AsciiEqual (header, 0x10, "ARCHIVE")) - return null; - Buffer.BlockCopy (header, 8, key, 0, 8); - */ - for (int i = 0; i < 8; ++i) - key[i] = (byte)(header[0x10+i] ^ "ARCHIVE\0"[i]); - for (int i = 9; i < 0x24; ++i) - header[0x10+i] ^= key[i&7]; - int index_offset = LittleEndian.ToInt32 (header, 0x20); - int count = LittleEndian.ToInt32 (header, 0x24); - if (index_offset < 0x24 || index_offset >= file.MaxOffset || count <= 0 || count > 0xfffff) - return null; - var index = new byte[0x114 * count]; - int index_size = file.View.Read (index_offset+0x10, index, 0, (uint)index.Length); - count = index_size / 0x114; - if (count * 0x114 != index_size) - return null; - for (int i = 0; i < index_size; ++i) - index[i] ^= key[(index_offset+i)&7]; - var dir = new List (count); - index_offset = 0; - for (int i = 0; i < count; ++i) - { - if (0 != index[index_offset++]) - return null; - int name_length = 0; - while (name_length < 0x100 && 0 != index[index_offset+name_length]) - name_length++; - if (0 == name_length) - { - index_offset += 0x113; - continue; - } - var name = Encodings.cp932.GetString (index, index_offset, name_length); - var entry = FormatCatalog.Instance.CreateEntry (name); - index_offset += 0x107; - entry.Offset = 0x10 + LittleEndian.ToUInt32 (index, index_offset); - entry.Size = LittleEndian.ToUInt32 (index, index_offset+4); - index_offset += 0x0c; - dir.Add (entry); - } - return new ArchiveFile (file, this, dir, key); + return new ArchiveFile (file, this, dir, reader.HeaderOffset, reader.Key); } public override Stream OpenEntry (ArcFile arc, Entry entry) @@ -120,10 +74,121 @@ namespace GameRes.Formats.AVC return arc.File.CreateStream (entry.Offset, entry.Size); var data = new byte[entry.Size]; arc.File.View.Read (entry.Offset, data, 0, entry.Size); - int base_offset = (int)(entry.Offset-0x10); + int base_offset = (int)(entry.Offset-arcf.HeaderOffset); for (int i = 0; i < data.Length; ++i) data[i] ^= arcf.Key[((base_offset+i)&7)]; return new MemoryStream (data, false); } + + internal class AdvReader + { + ArcView m_file; + byte[] m_header = new byte[0x80]; + byte[] m_key = new byte[8]; + byte[] m_index; + int m_index_offset; + int m_count; + int m_header_offset; + + public byte[] Key { get { return m_key; } } + public int HeaderOffset { get { return m_header_offset; } } + + public AdvReader (ArcView file) + { + m_file = file; + } + + public List GetIndex () + { + if (m_header.Length != m_file.View.Read (0, m_header, 0, (uint)m_header.Length)) + return null; + foreach (var scheme in KnownSchemes) + { + if (!ReadIndex (scheme.KeyOffset, scheme.HeaderOffset)) + continue; + try + { + var dir = ParseIndex(); + if (null != dir) + return dir; + } + catch { /* ignore parse errors */ } + } + return null; + } + + bool ReadIndex (int key_offset, int header_offset) + { + // placing predefined string into XORed file is a very smart move + for (int i = 0; i < 8; ++i) + { + var symbol = m_header[header_offset+i] ^ "ARCHIVE\0"[i]; + var check = m_header[key_offset+i] ^ symbol; + if (check < 0x20 || check > 0x7e) + return false; + Key[i] = (byte)symbol; + } + for (int i = 0x10; i < 0x24; ++i) + m_header[header_offset+i] ^= Key[i&7]; + int entry_size = LittleEndian.ToInt32 (m_header, header_offset+0x14); + if (0x114 != entry_size) + return false; + m_index_offset = LittleEndian.ToInt32 (m_header, header_offset+0x10); + m_count = LittleEndian.ToInt32 (m_header, header_offset+0x20); + if (m_index_offset < 0x24 || (long)m_index_offset+header_offset >= m_file.MaxOffset + || m_count <= 0 || m_count > 0xffff) + return false; + int index_size = 0x114 * m_count; + if (null == m_index || m_index.Length < index_size) + m_index = new byte[index_size]; + if (index_size != m_file.View.Read (m_index_offset+header_offset, m_index, 0, (uint)index_size)) + return false; + m_header_offset = header_offset; + return true; + } + + List ParseIndex() + { + for (int i = 0; i < 0x114 * m_count; ++i) + m_index[i] ^= Key[(m_index_offset+i)&7]; + var dir = new List (m_count); + int index_offset = 0; + for (int i = 0; i < m_count; ++i) + { + if (0 != m_index[index_offset++]) + return null; + int name_length = 0; + while (name_length < 0x100 && 0 != m_index[index_offset+name_length]) + name_length++; + if (0 == name_length) + { + index_offset += 0x113; + continue; + } + var name = Encodings.cp932.GetString (m_index, index_offset, name_length); + var entry = FormatCatalog.Instance.CreateEntry (name); + index_offset += 0x107; + entry.Offset = m_header_offset + LittleEndian.ToUInt32 (m_index, index_offset); + entry.Size = LittleEndian.ToUInt32 (m_index, index_offset+4); + index_offset += 0x0c; + dir.Add (entry); + } + return dir; + } + + internal class Scheme + { + public string Password; + public int KeyOffset; + public int HeaderOffset; + }; + + private static readonly Scheme[] KnownSchemes = new Scheme[] { + new Scheme { Password="SETSUEI-", KeyOffset=0x08, HeaderOffset=0x10 }, // Setsuei + new Scheme { Password="CHOKOPAI", KeyOffset=0x35, HeaderOffset=0x51 }, // Chokotto*Vampire! + new Scheme { Password="ClOVeRrE", KeyOffset=0x11, HeaderOffset=0x46 }, // Clover Point + new Scheme { Password="-AYASEKE", KeyOffset=0x0c, HeaderOffset=0x15 }, // Ayase Ke no Onna + }; + } } }