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(MGPK): implemented version 0 archives.

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This commit is contained in:
morkt 2019-01-28 19:23:51 +04:00
parent 574a9c5b5b
commit e0114ad91d
1 changed files with 71 additions and 13 deletions
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84
ArcFormats/MangaGamer/ArcMGPK.cs
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@ -71,8 +71,9 @@ namespace GameRes.Formats.Mg
public override ArcFile TryOpen (ArcView file)
{
int version = file.View.ReadInt32 (4);
int count = file.View.ReadInt32 (8);
if (count > 0xFFFFF)
if (version < 1 || !IsSaneCount (count))
return null;
long cur_offset = 0x0C;
var dir = new List<Entry> (count);
@ -81,7 +82,7 @@ namespace GameRes.Formats.Mg
{
uint name_length = file.View.ReadByte (cur_offset);
string name = file.View.ReadString (cur_offset+1, name_length, Encoding.UTF8);
var entry = FormatCatalog.Instance.Create<Entry> (name);
var entry = Create<Entry> (name);
entry.Offset = file.View.ReadUInt32 (cur_offset+0x20);
entry.Size = file.View.ReadUInt32 (cur_offset+0x24);
if (!entry.CheckPlacement (file.MaxOffset))
@ -92,9 +93,9 @@ namespace GameRes.Formats.Mg
}
if (has_encrypted && KnownKeys.Count > 0)
{
var options = Query<MgOptions> (arcStrings.ArcEncryptedNotice);
if (options.Key != null)
return new MgArchive (file, this, dir, options.Key);
var key = QueryKey (file.Name);
if (key != null)
return new MgArchive (file, this, dir, key);
}
return new ArcFile (file, this, dir);
}
@ -109,14 +110,14 @@ namespace GameRes.Formats.Mg
{
byte[] data = new byte[entry.Size];
input.Read (data, 0, data.Length);
data = DecryptBlock (data, mgarc.Key);
DecryptData (data, mgarc.Key);
if (entry.Name.HasExtension ("txt"))
return DecompressStream (data);
return new BinMemoryStream (data, entry.Name);
}
}
private byte[] DecryptBlock (byte[] input, byte[] key)
protected virtual void DecryptData (byte[] input, byte[] key)
{
key = (byte[])key.Clone();
for (int i = 0; i < input.Length; i++)
@ -124,14 +125,13 @@ namespace GameRes.Formats.Mg
input[i] ^= key[i % key.Length];
key[i % key.Length] += 27;
}
return input;
}
private Stream DecompressStream (byte[] input)
internal Stream DecompressStream (byte[] input)
{
byte[] output = new byte[input.Length * 2];
int output_size = lzf_decompress (input, ref output);
return new MemoryStream (output, 0, output_size);
return new BinMemoryStream (output, 0, output_size);
}
private static int lzf_decompress (byte[] input, ref byte[] output)
@ -175,6 +175,12 @@ namespace GameRes.Formats.Mg
return dst;
}
internal byte[] QueryKey (string arc_name)
{
var options = Query<MgOptions> (arcStrings.ArcEncryptedNotice);
return options.Key;
}
public override ResourceOptions GetDefaultOptions ()
{
return new MgOptions { Key = GetKey (Properties.Settings.Default.MGPKTitle) };
@ -193,12 +199,64 @@ namespace GameRes.Formats.Mg
return key;
}
public static Dictionary<string, byte[]> KnownKeys = new Dictionary<string, byte[]>();
public static Dictionary<string, byte[]> KnownKeys { get { return DefaultScheme.KnownKeys; } }
static MgScheme DefaultScheme = new MgScheme { KnownKeys = new Dictionary<string, byte[]>() };
public override ResourceScheme Scheme
{
get { return new MgScheme { KnownKeys = KnownKeys }; }
set { KnownKeys = ((MgScheme)value).KnownKeys; }
get { return DefaultScheme; }
set { DefaultScheme = (MgScheme)value; }
}
}
[Export(typeof(ArchiveFormat))]
public class Mgpk0Opener : MgpkOpener
{
public override string Tag { get { return "MGPK0"; } }
public override string Description { get { return "MG resource archive"; } }
public override uint Signature { get { return 0x4B50474D; } } // MGPK
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
int version = file.View.ReadInt32 (4);
int count = file.View.ReadInt32 (8);
if (version != 0 || !IsSaneCount (count))
return null;
long cur_offset = 0x0C;
var dir = new List<Entry> (count);
bool has_encrypted = false;
for (int i = 0; i < count; ++i)
{
string name = file.View.ReadString (cur_offset, 0x20, Encoding.UTF8);
var entry = Create<Entry> (name);
entry.Offset = file.View.ReadUInt32 (cur_offset+0x20);
entry.Size = file.View.ReadUInt32 (cur_offset+0x2C);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
has_encrypted = has_encrypted || name.HasAnyOfExtensions ("png", "txt");
dir.Add (entry);
cur_offset += 0x30;
}
if (has_encrypted)
{
var key = QueryKey (file.Name);
if (key != null)
return new MgArchive (file, this, dir, key);
}
return new ArcFile (file, this, dir);
}
protected override void DecryptData (byte[] input, byte[] key)
{
for (int i = 0; i < input.Length; i++)
{
input[i] ^= key[i % key.Length];
}
}
public override ResourceScheme Scheme { get; set; }
}
}